CA2148949A1 - Coaxial cable connection method and device using oxide inhibiting sealant - Google Patents
Coaxial cable connection method and device using oxide inhibiting sealantInfo
- Publication number
- CA2148949A1 CA2148949A1 CA002148949A CA2148949A CA2148949A1 CA 2148949 A1 CA2148949 A1 CA 2148949A1 CA 002148949 A CA002148949 A CA 002148949A CA 2148949 A CA2148949 A CA 2148949A CA 2148949 A1 CA2148949 A1 CA 2148949A1
- Authority
- CA
- Canada
- Prior art keywords
- connection jack
- cable
- moiety
- sealant
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/5216—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases characterised by the sealing material, e.g. gels or resins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S439/00—Electrical connectors
- Y10S439/933—Special insulation
- Y10S439/936—Potting material or coating, e.g. grease, insulative coating, sealant or, adhesive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49174—Assembling terminal to elongated conductor
Abstract
ABSTRACT OF THE DISCLOSURE A method and a device is provided which allows the connection of coaxial cable termini to one another with minimum long-term loss of RFI shielding. The method comprises the removal of metal oxides from the concentric conductor portions of the two cable termini, applying a sealant to the concentric conductor termini and then connecting the central conductor termini to one another and the concentric conductor termini to one another. The device comprises a collet structure dimensioned to slip over the outside of a standard connection jack. Within the collet structure is disposed a quantity of sealant oozes from the collet structure to the exterior of the collet structure. When the collet structure is attached to the jack, the sealant is caused to ooze onto the concentric conductor thereby sealing the concentric conductor from the ambient.
Description
wo 94~ 4 8 9 ~ 9 pcrnJs93/~
COA2~9L CABLE CONNECTION ~ IOD AND DEVICE lJSlNG
OXIDE IN~IT~NG SEAI~T
PATENT APPLIC:ATIONS INCORPORATED B~r REFERENCE
This application incorporates herein comple~ely the entirety of United States Patent Application Serial No.
07/912.106. filed July 9. 1992. United States Patent Application Serial ~o. 07~509.669. flled April 19. 1990. United States D Patent Application Serlal No. 07/434.068. hled November 8.
1989. and Unlted States Patent Application Serial No.
07/364.917. f~led June 9. 1989.
Technical ~ield of th~ lnvention ~s .
This lnventlon relates generally to mcthods and devices for connecting the termlnl of coaxial cables together and.
specifieally, to methods and devices for sealably connecting the term~ni of coa~dal cables while mlnimlzing radio frequency a~ interference.
E~a~roun~Lf th~ lnven~i~n ,: :
Coaxial cable is wldely used for dlstributing v~de band radlofrequency ~nfonma~on.such as tele~ion and ra~o sign~s.
The cable televisiontradio industry. whtch relles almost a;cluslvely on coa~al cable. is one of t.be most rapidly expandin~
segmen~ of the Unitffi States' ecorlomy. lt is anticipated that in the very near future the sount and type of infonna1ion available 3~ ~fia coaxial cable netvorks will be greatly expanded beyond traditional television and rad~o signals. Coaxial cable networks may soon be the principal vehicle by which consumers obtain their daily news. access libraly information. do t~eir shopping.
pay their bills. and othenvise interact with much of the outside 3; world. Malntaining and controlling the integrl'y of these cr~tical coa~dal cable distributlon networks ~s a ma~or challenge for the cable network indust~
w~ 94"3~ 2 ~ ~ 8 9 4 ~
, ... .
Coaxial cable ~pically includes a central a~al conductor and an outer conductor which is disposed concentrically around the cen~ral conductor. A low-loss. high dielectric insulation material. such as plastic foam. separates the t~o conductors. An outer insulating ~acket is often provided over the concentric conductor to provide electrical insulation. shieldtng and physical protection to the cable. The concentric conductor may be a single continuous element or. more commonly, it is a compostte of several layered elements of thin conductive foil. wire braid or simtlar material. The foil. braid or other stmllar material Is generalhr made from an aluminum all~
Coaxial cable networks comprise lengths of cable connected to one ano~er by connectton equtpment. Such con~ection equlpment most often takes the form of a male/female conneceion system wherein the male member includes a connectlon ~ack and the female member Includes a threaded or friction-fit coupler dimensioned to couple urlth the male ~ack. A~ sho~n In Figure 1. a standard connection ~ack RG~
59 eable. eomprises a eylindrieal. extemall~r threaded body. For a~RG59 cable the outslde dia~neter of the ~ack Is about 0.375 inches (.952 em). I~e ou~wardly pro~eetlng end of the ~aek is eovered by a planar member whieh has a een~ral aperture.
Behind the apertu~c within the confines of the bo~r of the )ack.
is d~sposed an inte~nal eonduetor. The body ~s eleetrieally 2;eonneeted to one of the coa7dal eable circults and the inner eonductor is connected to the other eoa~al cable ~t.
The female member in the ~ypieal male/female conneetion y~tem eommonly comprises a ~aek eonneetton moie~y which is adapW to attach to the cable connection ~ack. ~e female 3~member also comprises a cable connection moiety which physically attaches to the te~minus of a coa~d~ cable in such a ` way that the cable connection moiety is in electrical contact wlth the concentric conductor of the coa~al cable. lhe cable connec~lon molety is adapted to allow the terminus of the 3scentral conductor to pro~ect through the center of the female mcmber without contacting the female member. so that. when the ~ack mole~y is attached to the outside of the conductor ~ack body. the central conductor terminus protrudes into the 21A89~9 WO M/130411 3 K~/US9311l342 connecuon jack central aperture (urithout contacting the jack connec2ion moiety of the female member or the conductor ~ack body) and is placed into electrical contact with the internal conductor of the connection ~ack. It is a basic re~3uirement of the male/female connectlon system that electrical continuity is provided between the outer concentric conductors and the central conductors of loined cables while maintaining isolation between these conductors.
When all of the connections along a run of coaxial cable are prope~lv made. the cable is largely shielded from the recelpt and emission of electromagnetic radiation. rnls is because the outer concentric conductor carries a current which ls precisely the reYerse of ~hat wh~c~ is carried by the central axial conductor. so that the resulting pair of magnetic flelds cancel each other out. If, however, the~ concentric conductor is impropcrly connected anywhere along the cable nm. Ilttle or no reverse current will nOw along that conductor a~d the shielding nonnally present in the cable run v ill bc el~minated. Wlthout such shieldlng. the signal current travel~ng along the central a) a~dal conduc~or will emlt electromagneUc rad~ation to the atmoæphcre, and extraneous electromagnetic radia~on from the atmospbere will be receh~ed by the cen~al aldai conductor.
E:lcc~romagnetic radlation in the radio fre~ucn~y range can prcs~nt at least two problcms. Firstly. incoming radlo fr~qucrl~y radiation interferes wlth the signal carrled by the central axtal conductor. Secondly, mdio ~requen~y radiation emanatlng *om the central a~dal conductor interfere~ with other radio wave recelving equipment in ~he v~cini~r. The Federal Communications Commission (FCC) has promulgated and 3~ erlforces strict r~gulations regarding radio fre~uency emission interference ("RFI").
Improper connections along concentric conductor circuits can arise for several reasons. ~rstly. the connec~don e~uipment is sometimes tmproperly installed or a subse~uent event mav 3 mechanically damage the connection equipment. Secondly. the connection tennini are frequently covered by a coating of oxidation at the time of initial conneclion. Finally. the connecUon termini tend to continue to oxid~ze after installation.
wo ~4/t3040 4 2 1 ~ 8 9 ~
This phenomenon is especially prevalent where the concentric conductor ls made from an aluminum alloy.
l~e prior art contains numerous methods and de~nces to pro~de long-term integrity of the outer conductor circuit. For example. methods and devices which use mechanical techniques for creating an especially strong contact between connection elements and the outer conductor have been tried. However.
these methods and devices are generally expensive and usually require the use of spec~al tools. Also. the methods are of limited ~D value in protecting the connection points ~rom the effects of long-te~m oxidation of the conductor termini by the atmosphere.
Other attempts calculated to provide thc long-term connectton integrlty have used mechanical sealing means to seal off the connection points from the atmosphere. However. these ~5 mcthods usually enta11ed ~xpensive and complex connection equlpment. Also. such mechanical sealing means offer on}y limited value against the long-term di~usion of oxidizlng e~lcments into the connect~on area.
Flnally, several attempts have been madc to seal coa~
:~ cable connections uslng a sealant grease or gel. However. the~e attempts have been found to be less than ~ully satisfactory.
prcsumably because these attempts do not addrcss the problem of inl~lally adst~ng o~dde~ on thc connec~don ten~ni.
Thereforc. thcre is a need for a simple a~d inexpen~
:~s method and devlce for connecting thc coa~dsl cable ~ermin~ in such a way that RFI shidding problems are mlnin~
Summa~y of the Invenffon `~
... , ~
3) The invention satisfies this need as well as many other benefits ob~lous to the skilled artisarl. -The invcntton is a rnethod for connect~ng the tennln~ o~ -two or more coaxial cables wherein the coa~dal cables ha~ ~
central axial conductor and at least one outer conccn~c :}; conductor. The method comprises the steps of: coating the concentric conductors with an oxide abrading sealarlt.
connectlng the central axial connectors. and conncctin.e ~he concentrlc conductors. The oxide abl~din sealant is suff~clent 2~94~
WO 941L3040 5~ uss3l~
abrasi~ e tO abrade awav metal oxides from the concentric corlductor termini during the connection step but is not so abrasive so as to damage the thin foil and/or wire braid at the cable terminus.
s Preferably the sealant is resistant to o~ddation and is insoluble in water. It is also preferable that the sealant has sufficient viscosity to keep it from flowing away from the concentric conductor connection under any anticipated operating conditions.
The invention is also a coupling device for oxidatively - seal~ng a coa~dal cable to a cable port or cable splice. The coupllng devise comprises a cable connector ha~ng at least one connectlon end which contains a seallng amount of an oxide abradlng seallant.
B In a preferred embodiment. the coupling device is adapted to connect a coaxial cable terminus to a standard coa~dal cable connection ~ack. wherein the connectlon ~ack compri~es a body with a connection ~ack aperture and an lnternal electric conductor insulatingly disposed wlthin the body proxlmate to 5D t~he connection~ack aperture. The device comprl~es~
an electrlcally conduct~ve connection.~acl~ attachment moiety compris~ng a connectloIl ~ack attachment moiety and a cable attachment molct~
the conneetion ~ack attachment moie~y deflr~ng a collet 3 structu~.e ha~rlng a base. a base aperture, at least one grease aperture and a pluralit~r of flared i~ngers. and the ~able att.achment moiety having an open ended hollow ~yllnder ~vhlch communicates with the collet base aperture.
where~n ~e connectlon ~ack attachmen~ moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to electrically and shieldingly attach to ~e cable attachment moiet~ wh~le with the concentric conductor a~dally through the collet base aperture. through the connect~on )ack aperture. and 3; into electrical contact with the internal elec~cal conductor~
a hollow. open-ended swagBng shell dlsposed around the connection ~ack attachment moiety and comprising compression moietv and a retraction moien~, the compression , ".
wo g4113040 2164 8 ~ 4 9 K~/USg3111342 ~ ' - moietv being dimensioned tO tightly surround the flared fingers of the connection ~ack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the body of a connection jaclc attached to the tenninus of the cable:
a sealing quantity of sealant disposed within the collet struc~ure: preferably the ~uanti~y of sealant being sufficient to flll at leas~ about 40 percent of the volume defined bv the collet stn~cture: and removable cover means for cooperattng wlth the collet structure to substantlally encapsulate the quant~y of sealant.
Preferably each of the flared fingers in the connection jack connection moiety has a sealant aperture. It is also preferable that the slits between the nared fingers be covered by a thin.
flexible webbing.
In one embodlment. the removable cover mcans comprlses a cap havlng an end cover and a ~ylindrlcal body.
Preferably the cyltndrical body has sufflcient length to seal the sllts betwcen the flared fingers of the collet structure. Also :D preferably, the remo~rable cover ~s adapted to ~nterlock with the collet structure ~n such a way ~hat the cap can~ot be rotated about the cable tenninus independent of thc collet structure.
lhls preferrcd embodlment of the cap allows the cap to be used as a "wrcnch" to make it eas3r for a user to install the connection :~ ~ack attachment molety to the cable te~minus.
The Inventlon provides for the firæt tlme a simple and Inacpenslve method for ensuring RFI shidd~ng of a coaxlal cable ruIl~ even after years of use in outdoor senvlce. The method of the invention is easy to app~ and the device of the imrentlon is 3~ inexpensive and simple and easy to use. An add~t~onal benefit ofthc invention permits retrohWng onto existing coaxial cable runs without special tools or equipment.
Brlef D~ ~ption of tl~
3 , : ~:
These and other features. aspects and advantages of the present invention will become understood with reference to the : :
~. ... . . .
wo 94J~ 21 4 ~ 9 ~ 9 Pcr/uss3nl342 following description. appended claims and accompanying illustrative drawings. where:
Figure 1 is a cross-sectional view of a coaxial cable connec~on system having features of the inv~ntion;
Figure 2 is a prospective view of a conneetlon jack connector having features of the invention;
Figure 3 is a prospective view of an assemblage having features of the invention;
Figure 4 is a cross-sectional view of a second connective ~ ~
D ~ack connector havtng features of the invenffon; ~ ;
Figure 5a is an end vlew of a connection ~ack connector hav~ng web be~ween the flared firlgers; and .
F~gure 5b is an end vlew of a connection ~ack connector ~ ~ ~
haYing an external sleev~ to create a web between the nared ~ -s f~ngers.
, ., ~ , , , ~, ~ r ven~Dn~ ls a method for ic,onnecting the tennini of a) two or more coax~al cables where~n the coaadal cables each have a ccn~al axlal conductor and an outer co~centrl~ conductor.
Thc method com~riscs the steps of coa~~g each of the co~centrlc co~,dtlct~ors with a se~g",a,mount of an o~dde abradi~g, sealant. connecting the central conductors to one 2; anothcr, and;connecting the concentric collductors to one anothcr. Optionally. before the ce~ltral cor~ductors are çonnected to one anot~er. they are also coated wltb the sealant.
~ The ~ealant is sufflc~entl3~ abrasive to re~ve oxldes from the concentric and central coI~ductors. However. tlle sealant is 3 not so abs~sive so as to substant~ally damage the thin foil and/or w~re braid in ~he concentric conductor.
The sealant base material can be prepared from a wide v~riet3r of organic arld inorganic oils. greases and wa~ces. A
suitable sealant is a vegetable oil based grease distributed by Blackburn. Dlv~sion of FL Industrles. lnc. of St. Louis, Missouri under the name "8-3 Coa~tax." Another material whlch has been found suitable as a seala~t is a mixture of about 20% oil and about 80% wax.
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21~9~
WO 94113Q40 8 Pcrlusg3/l~342 :
An abrasive material is added to the sealant base material.
In one embodiment. glass beads having a diameter range be~veen about 0.00001 inches (0.0000254 cm) and about 0.002 inches (0.00508 cm) are added into the sealant. Preferably the s diameters of the glass beads are between about 0.0003 inches (0.000762 cm) and about 0.0008 inches ~0.002032 cm) in diameter. Other dielectric materials besides glass may also be used. such as sand or silica. Also. the abrasive material need not be spherical. For example. glass flbers could be used as the abrasive ma~.
The sealant is preferably chemically resistent to elements present in the amblent environment~ 'rhc sealant should be resistant to oxygen penetration. The seahnt should also be resistant to air pollutants and to organic deg~adants. The sealant is also preferably insoluble in water and in all other llqulds which may contact concaltric conductor connection.
It is 1mportant tlaat the sealarlt be sufflciently v~scous to prc~ent slumping and tlowing under senr~ce conditlons.
Preferably the viscosl~y of the sealarlt at about 68 Fahrenhdt 20_ Celslus) ls a~ least about l,OOO cp~. At about 150 Fahrenheit (66_ Celslus) ~s also preferable that the ~scosi~y of the sealant be at least about 500 cps. The seal~t should not.
however, be so v~scous so that it cannot-be east}y displaced durislg the connect10n procedure or ~ at low temperatures.
~; Ideally, the viscosity-of the seaiant at about 68 ~20_ Celslus) Fahrenhdt is between about 2.~ cps and about 50.000 cps.
aIId at about l50_ Fahreslhdt (66_ Celslus). betwel about 500 cps a~d about l.OOO cps.
As shown in the draw~ngs. the Inven~on is also a coupling 3~ device 8 useful in the connec~on of a coasdal cable tenrlinus 32 to a standard coa~dal cable connection jack 38 us~g Ll~e me~hod of the invention. As used herein. the phrase "standard connection.~ack" refers to that most common connection jack havlng (l) a body 46 with a connect~on jack aperture 76 and :~; (2) an lnternal electrical conductor disposed within. but insulated from the conneetion jack bod~r prox~mate to the connectlon ~ack aperture 76.
.. .. ~ .
., . . - ., . . ..
- 21~89~
WO g4/13044 9 Pcrluss3llu42 The coupling device 8 comprises a connection jack conneclor 10. a hollow swagging shell 12. a quantity of sealant 78 and removable cover means to substantially enca.psulate the quantitv of sealant 78.
The connection jack connector 10 comprises two connection ends. a connection jack attacl~nent moiety 16 and a cable attachment moiety 1~. The connection ~ack attachment moietv 16 has a collet structure with a collet base 20 and a pluralitv of flared fingers 22 which extend outwardly from the base 20 to form a collet attachmen~ cup 24 hav~g a peripheral edge 26. ~.
The collet base 20 defines a central aperture 28 dLmensioned to allow the central conductor 30 of a coa~dal cable terminus 32 to protrude through the collet base 20 into the collet cup 24 without mak~ng electrical contact wlth thc connection ~ack conncctor structure. A typical.circular cent~al apture 28 has a diameter between about 0.15 and about 0.30 inches The 1ngers 22 def~e the. collet cup 24 and providc ar~
:D Inslde cyll~drical engagemerlt surface. 34 suitable for enga~g the outer threaded. surface 36 of a conncctio~ ~a~ 38. lhe ~n~lde surface 34 of the fingers 22 ma~ be s~ootll or it may be provlded u~lth a shallow-cut helical groove. thread or rldg~
Preferably. each finger can have a ddge 40 r~g lateralh~
ZEi acro~s the uridth. of each finger 22. The. pitch;of. ~ ridge 40 ~s se~ to correspond wlth the thread p~tch of .the ~ack 38. In embodiments having the rldge 40. a mQre posit~ve attachmcn~
.~an be achic~red between the connection 3ack connector lO and the connection ~ack 38.
3) Preferably, each finger 22 is formed with a thicke~ed region 44 ad~acent to the chamfer 4;2 and becomes graduall~
thinned toward its connection with the collet base 20. The inside geometry of the collet cup 24 is generally cylindrlc~
when in an unstressed. uncompressed s~ate. When in such 3j unstressed. uncompressed state. the collet cup 24 definc~ a sllghtly curved or frustroconical geometrv. This allows Ihe connection jack attachment moiety lB to be easilv slipped o~rer ~he outside surface 36 of the connection jack bodv 46.
2~489~'3 -WO g4/~40 -10-..
l~e collet cup 24 is dimensioned so that. in its unstressed state. it can be easily slipped over the outer surface of a connection )ack body 46 but. when hoop stress is applied to the external surface of the fingers 22. the connection jack attachment moiety 16 can be tightly connected around the bodv 46 of a connection jack 38.
In a preferred embodiment to be used wlth a jack ha~ng an outslde diameter of 0.375 inches (0.952 cm). the collet stnlcture comprises four fingers 22. each deflning a ~uadrant of a cylinder ha~ing an inside di~neter between about 0.37 inches (0.940 cm) and about 0.38 inches (0.965 cm). Each flnger is betwecn about 0.2 inches (0.50B cm) and about 0.5 inchcs (1.270 cm) long. Each flnger 22 ls separated frcm an ad~acent flnger bv a longitudinal slit 48 whlch can be bet~veen about 0.01 inches (0.0254 cm~ and about 0.1 inche~ (0.254 cm) wide.
preferably between about 0.04 inches (0.101 cm) ~nd about 0.1)5 inches (1.270 cm) u~ide. The flngers 22 may be formed by cross-sa~wing across the collet structure at rlght angles.
Altematively, and preferab~r for mass productlon. the fingers 22 a~ arc formed by a single mad~ ng operatlon of two parallel saws wh~ch movc In one d~rcction across the collet structure.
In a most preferred embodiment. ~he longitudl~al s~lts 48 betwcen the flngers 22 Is covere~ or fllled w~th a thin fle~dble web 49. The ~web 49 ls sufflciently ~e~dbk so as to be read~lv 2i deformed when hoop stress is applled to the collet structure.
Ihe web 49 can be any suitable materlal havtI~g sufficient fladblllt~r. The wcb 49 can be a thln slec~re 51 dl~po~cd over the collet structure as shown in Flgure 5b. For ef~clency of manufacture. thc web 49 is inte~al with the f~ger 48 as shown :~ in Flgure 5a. It has been found that the use of a web 49 improves the dlstribution and abrasive actton of the sealant d~ring installat~on by not allo~nng the sealant to be ~uded OUt through the slits 48.
lhe connection ~ack connector 10 further comprises a 3i cablc attachment moiet~r 18. The cable attachme~ moiety 18 is physically attached to the connectton ~ack attad~ent molety 10 proximate to the collet base 20. The cable attachment molenr 18 ts also adapted to attach to the coa~al cable terminus 32 in ;. . : . .
-.
: , . ~ . ~ .. , 21~89 ~
such a way that the cable attachment moiety 18 is in electrical contact with the concentric conductor 50 of the cable terminus 32 while the central conductor 30 Is caused to protrude axially through the collet base aperture 28 and into the center of the collet cup 24.
l~e cable attachment moiety 18 can be any of the standard crimp-on varieties commonly known in the industry. The cable attachment moiety 18 can also be one of the several types disclosed in U.S. Patent Application Serial No. 07/364.917.
D which is completely tncorporated herein by reference for all purposes.
Preferably. however. the cable attachment molety 18 is a screw mandrel 52 having ~) a cylindrical mandrel element 54 and. (2) a hel~cal knife-blade ridge 56 whlch forms a screw s thread deflned on the exteI~ior of the mandrel element 54. The mandrel element 54 is generally cyl~ndrical ha~lng an outside diamcter eho8en for use wlth the size of the cable outside dlameter wlth whlch it ls to be used. For RG59 cable. the preferred outside diameter of the mandrel element 54 is :D betwecrl about 0.20 and about 0.21 inches. ~erably. the mandrel element 54 ~s sl~ghtly frustroconlcal for ease of insertion. Also. 1I1 a typical embodiment. thc portton of the mandrel clement 54 distal from the collet ba~e 20 ls thlnned to provlde a sharp reanvard openi:~g 58. The hdical Im~fe-blade $ ridge 56 has a height wh~ch is between about 0.02 inches (0.0508 cm) and about 0.06 inches ~0.152 cmJ. preferably between 0.038 Inches (0.0965 cmJ ~nd 0.042 inches (0.107 cm). and is formed as a a~utely angled pro3ectioIl extending f~om thc mandrel element 54. In a preferred embodiment. the 3) "threads" which are formed by knife-edge ridge 56 are 60 angle threads and are disposed at about 8 tO about 16 threads per inch. preferably between about 11 to al~out 13 threads per Inch labout 4 to 5 threads per centimeter).
The hel~cal lmife-blade ridge 56 is shaped so as to bite 3 sufficie~tly into the metal braid 60 which forms the concent~c conductor 50 in most coaxial cable. Such a helical knife-blade ridge 56 has also been shown to provide a secure mechanical attachment to the coa~dal cable terrninus 32 wlthout causin~ the - - - :-.
-':
: ', wo s4n3040 -12- PCr/uss3nl342 metallic strands which form the braided concentric conductor 50 to s~ear or break off. An effective compromise between sharpness and dullness of the knife-blade edge rldge 56 ~s to make it flat across for about two to three s~ils. A one mil flat is s too sharp and will result in shearing the f~ne wlre braid 60;
~hile an eight-mil radius at the edge has been found to be too dull with resultant slippage of the braid under tension. Ideally, the knife-blade ridge 56 should sub~ect the braid wires to shear stresses without actually resulting in shearing.
The use of a helical knife-blade rldge 56 on the cable attachment moiety 18 of the connection 3ack connector 10 has been ~ound to be particularly advantageous in order to facilltate easy ~nsulation of the conncction ~ack connector 10 onto thc coa~dal cable 62, especially at low ambient tempcral ures.
~s The connection ~ack conneetor 10 ls made from an electrieally conductive material. usually a mctal. Alum~num 1~ a h~ghly preferred such metal beeause lt is llght welght.
in~si~re and htghly co~ductlve. Where tbe cable attaehment moiety 18 eomprlses a serew mandrel 52 a~d the eable a) attaehment molety 18 ~s made from alu~num. another conduetlve material. sueh as a tln allor. ls prefierably applied to the acter~or of the mandrel elemen~ 54 to proYlde additio~al lubrlclt~r to the ex~erior of the mandrel dement 54 and to facilitatc the insert~on o~ the mandreI- element 54 into ehe 2s coaodal cable ten~nus 32.
Thc swagglng shell 12 has an open-endcd hollow tubular ~hape. The sw~ng shell 12 has a compresston moiel;y 64 and a retraction moiet~r 66. The compression moletar 64 Is adapted to~apply hoop stress to the exterior of thc collet f~ngers 22 on the connection ~ack connector 10 and the retraction moie~y 66 is adapted to interface wlth one or more tools adapted to drlve the swagging shell 12 over the collet fingers 22 and/or.
altern~tively. to retract the compression moiety 64 off of. and away from. the collet fingers 22.
3; The compression moie~ 64 is generallv cylindrical and is dlmensioned to be slldable over the collet ~ngers 22 in such a way as to impart considerable hoop stress to the collet fingers 22. thereby causing the collet fingers 22 to ti~htlv grip the wo wl = 2 1 4 8 9 ~
extefior surface 36 of the connection jack body 46. For a standard jack having an outside diameter of about 0.375 inches (0.95 cm). the inside diameter of the compression moiety 64 is ~picallv between about 0.40 inches (1.02 cm3 and about 0.42 s inches 11.0~ cm), preferably between about 0.41 inches (1.04 cm) and 0.415 inches (1.054 cm).
The retraction moie~r 66 of the swagglng cylinder 12 is also typically cylindrical. It is attached to the compression moietv 64 in such a way that the longitudinal axes of the compression moiet~r 64 and the retractlon molety 66 are coaxial.
The inside diameter of the compress~on moiety 64 is dimensioned to allow the retraction moiety 66 to sllp freely along the outside of the coaxial cable 62. In a preferred embodiment. the outside diameter of the retraction moiety 66 is ~5 dimensioned to be sllghtly'smaller than the outslde dlametcr of the compresslon mole~ 64 so *at an annular shoulder 68 is formed at the interface of the retr~c~ion molet~r 66 and the compression mole~ 64. In a typlcal embodiment. the annular shoulder 68 is behveen about 0.10 inches (0.254 cm~ and about 5D 0.20 Inches (0.51 cm) in wldth. Such annular shoulder 68 p~ des a surf~ce aga~nst which an a~dal force can be appl~ed so as to urge the swagglng shell 12 over the collet flngers 22.
In another preferred embodiment. the a~tertor surface 70 of the retractiorl molety 66 is prov~ded with indenta~ons. ridges 2i or other stnacture capable of provlding a surf~ce against which aforce can be applied to the swagglng sbell 12 to urge the swagging shell 12 off of the collet flngers 22. In a most preferred embodiment. such structure is pr~vided by external screw threads 72.
3~ The swagging shell 12 is made from a rigid material capable of withstanding the pressures and wear and tear resulting from its interac~cion u~ith the collet f~ngers 22 and wi~
various driving and retraction tools. Typically. the swagging shell 12 ls made from a metal. such as a br~ss. an aluminum or a steel.
Where the connection ~ack connector 10 comprises a snandrel element 54 which is physically inserted into the coa~fial cable terminus 32 (such as the screw mandrel 52 described 21~9 ~i WO 94/13040 14-- PCTIIlS93/11342 above). ~he swagging shell 12 is preferably constructed so that the internal diameter of the retraction moiety 66 is smaller than the internal diameter of the compression moiety 64. and the interior surface 74 of the swagging shell 12 at the interface s between the retraction molety 66 and the compression moietv 64 ls beveled. Also. the internal diameter of the retraction moiety 66 can be dimensioned so as to apply a compressive force to the exterior of the cable terminus 52 in the region of the tenninus 52 wherein has been inserted a connection ~ack D CO~I~leCtOr 10 having a mandrel-1~pe conncction ~ack attachment moiet~ 18. In such an embodiment. the indde diameter of the retraction moiet~r 66 is dimensioned to be about the same or only slightly larger than the outslde dlameter of the cable t~us 32 after insertion of the mandrel eleme~t 54. Such a ; swag~ng shell 12 can be used to apply compresslve force to thc exterlor of a coax~al cable tennlnus 52 having Inserted thereln a cable attachment molety 18 comprising a mandrel ele~nent 54.
Such compressive force is effcct~ve in sec~ing and ma~ntalnlng a positive electrical connection bet~vccn the concen~c SD conductor 30 of the coa~dal cable 62 and the mandrcl da~S4 of the connectlon ~ack connector cable attaehmcnt motety 18.
In a preferred method of installing a connec~on ~a~
con~ector 10 havlng a mandrel demalt 54 to the coa~al cable ~; tcrminus 32. strands of the metal braid 60 which form ~heconcen~ic conductor 50. are disposed around the exterlor of thc collct flngers 22 and are held fast agalnst the ~ngers æ bv - tllc compression moiety 16 of the swagg~g shell 12. rhls installation method has been found to prov,ide a super~or 3) electrical connection between the cable attachmalt moiety 18 of the connectton ~ack connector 10 and thc concentric conductor 50, a connection which will not fail e~lren after numerous temperature cycles.
Figure 1 Illustrates how the swagglng shell 12 comprc~es the connectton ~ack connector 10 to form a ~ght eonncct~on wtth the cable terminus 32 and the connee~on ~ack 38. ~ -Sealants useful in the dev~ce have been descrlbed abo~
In a prefe~red embodiment the quantity of sealant is sufficlent t-~
WO 94/13040 - 2~5~ 8 ~ ~ ~ YCTIUS~311~2 fill at least about fffly percent of the volume def~ned by the collet s~ucture. most preferably at least about sixty percent.
Preferably the connection.~ack attachment moiety 16 has a pluralitv of sealant apertures 80. In a typical embodiment. each of the nared flngers 22 has one sealant aperture 80 defined near the collet base 20. T~picallv the sealant aperture 80 is round and has a diameter between abou~ 0.3 inches (0.76 cm) and about 0.4 inches (1.02 cm). preferably about 0.325 lnches (0.826 cm) and about 0.363 inches (0.922 cm).
~D AS shown in the drawlngs, the removable cover means can comprise a cap 82 havlng an end cover 84 and a cylindrical body 86. Pre~rably the cyllndrical body 86 has sufflcierlt length to scal the slits 48 between the nared flngers 22 of the collet s2nucture.
In another preferred~embodiment. the removable cover means ~nterloc}cs with the collet stn~cture in such a ~vay that the removable cover means cannot be rotatcd abo~e the cable terminus 32 independent of the collet structure. In thls embodimcnt. the remo~rable cover means can be used as a a~ ~wrench" to turn the collet structure wlth re~pect to the cable tcrminus 32. This ls an important feature of the connection devlce in embod~nents havlng a threaded mandrel S2 whieh is screued asld unscrewed into the cable termirlus 32. Where the removable cover means interloc~ vv~th the collet structure. the 2; removable cover mean~ can be easily emplayed b~ the user to t~read the mandrel 52 into the term~nus 32 w~thout the need of any ldnd of tool.
Us~ng the device described above. the method of the invent~on can be employed to connect a coa~dal termlnus to a 3) standard connection jack 38 by the s~eps of attaching the electrically conductive connection jack connector 10 to the tenninus 38 of the cable 62. placing ~e connection jack connector 38 over the connection jack 10. and sllding the swagglng shell 12 over the nared f~ngers 22 of the connectton $ .~ad~ connector 38.
It has been found that the mere placing of the connection ~ack connector l O over the connection iack 38 causes the sealant to not onlv ooze rearwardly out of ~.~ sealant aperture~s~
~ . ~
wo ~4n3040 l~i-- Pcr/uss3/11342 80. but also to ooze out of the slits 48 between the flared fingers 2:2 and out of the rearward cpening 58 of the cable attachment moiety 18. This action causes sealant 78 to thoroughly coat under. oYer and throughout the concentric conductor terminus.
and on the lnside and outside suriaces of the cable attachment moiety 18. Thus. the entirety of the concentric conductor terminus is thorougUy coated with the seallant 78 and is thereb3 protected from o~dda~on.
lhe foregoing describes in detail sevcral preferred embodiments of the invention. The foregoing should not be construed. however. as limlting the invention to the particular e~nbodiL~nerlts desc~ibes. E'rac~tioners skllled ln thc art wlll recogr~ze numerous other embodiments as well. For a definition of the complete scope of the inventton. the reader is directed to the appended clalms.
COA2~9L CABLE CONNECTION ~ IOD AND DEVICE lJSlNG
OXIDE IN~IT~NG SEAI~T
PATENT APPLIC:ATIONS INCORPORATED B~r REFERENCE
This application incorporates herein comple~ely the entirety of United States Patent Application Serial No.
07/912.106. filed July 9. 1992. United States Patent Application Serial ~o. 07~509.669. flled April 19. 1990. United States D Patent Application Serlal No. 07/434.068. hled November 8.
1989. and Unlted States Patent Application Serial No.
07/364.917. f~led June 9. 1989.
Technical ~ield of th~ lnvention ~s .
This lnventlon relates generally to mcthods and devices for connecting the termlnl of coaxial cables together and.
specifieally, to methods and devices for sealably connecting the term~ni of coa~dal cables while mlnimlzing radio frequency a~ interference.
E~a~roun~Lf th~ lnven~i~n ,: :
Coaxial cable is wldely used for dlstributing v~de band radlofrequency ~nfonma~on.such as tele~ion and ra~o sign~s.
The cable televisiontradio industry. whtch relles almost a;cluslvely on coa~al cable. is one of t.be most rapidly expandin~
segmen~ of the Unitffi States' ecorlomy. lt is anticipated that in the very near future the sount and type of infonna1ion available 3~ ~fia coaxial cable netvorks will be greatly expanded beyond traditional television and rad~o signals. Coaxial cable networks may soon be the principal vehicle by which consumers obtain their daily news. access libraly information. do t~eir shopping.
pay their bills. and othenvise interact with much of the outside 3; world. Malntaining and controlling the integrl'y of these cr~tical coa~dal cable distributlon networks ~s a ma~or challenge for the cable network indust~
w~ 94"3~ 2 ~ ~ 8 9 4 ~
, ... .
Coaxial cable ~pically includes a central a~al conductor and an outer conductor which is disposed concentrically around the cen~ral conductor. A low-loss. high dielectric insulation material. such as plastic foam. separates the t~o conductors. An outer insulating ~acket is often provided over the concentric conductor to provide electrical insulation. shieldtng and physical protection to the cable. The concentric conductor may be a single continuous element or. more commonly, it is a compostte of several layered elements of thin conductive foil. wire braid or simtlar material. The foil. braid or other stmllar material Is generalhr made from an aluminum all~
Coaxial cable networks comprise lengths of cable connected to one ano~er by connectton equtpment. Such con~ection equlpment most often takes the form of a male/female conneceion system wherein the male member includes a connectlon ~ack and the female member Includes a threaded or friction-fit coupler dimensioned to couple urlth the male ~ack. A~ sho~n In Figure 1. a standard connection ~ack RG~
59 eable. eomprises a eylindrieal. extemall~r threaded body. For a~RG59 cable the outslde dia~neter of the ~ack Is about 0.375 inches (.952 em). I~e ou~wardly pro~eetlng end of the ~aek is eovered by a planar member whieh has a een~ral aperture.
Behind the apertu~c within the confines of the bo~r of the )ack.
is d~sposed an inte~nal eonduetor. The body ~s eleetrieally 2;eonneeted to one of the coa7dal eable circults and the inner eonductor is connected to the other eoa~al cable ~t.
The female member in the ~ypieal male/female conneetion y~tem eommonly comprises a ~aek eonneetton moie~y which is adapW to attach to the cable connection ~ack. ~e female 3~member also comprises a cable connection moiety which physically attaches to the te~minus of a coa~d~ cable in such a ` way that the cable connection moiety is in electrical contact wlth the concentric conductor of the coa~al cable. lhe cable connec~lon molety is adapted to allow the terminus of the 3scentral conductor to pro~ect through the center of the female mcmber without contacting the female member. so that. when the ~ack mole~y is attached to the outside of the conductor ~ack body. the central conductor terminus protrudes into the 21A89~9 WO M/130411 3 K~/US9311l342 connecuon jack central aperture (urithout contacting the jack connec2ion moiety of the female member or the conductor ~ack body) and is placed into electrical contact with the internal conductor of the connection ~ack. It is a basic re~3uirement of the male/female connectlon system that electrical continuity is provided between the outer concentric conductors and the central conductors of loined cables while maintaining isolation between these conductors.
When all of the connections along a run of coaxial cable are prope~lv made. the cable is largely shielded from the recelpt and emission of electromagnetic radiation. rnls is because the outer concentric conductor carries a current which ls precisely the reYerse of ~hat wh~c~ is carried by the central axial conductor. so that the resulting pair of magnetic flelds cancel each other out. If, however, the~ concentric conductor is impropcrly connected anywhere along the cable nm. Ilttle or no reverse current will nOw along that conductor a~d the shielding nonnally present in the cable run v ill bc el~minated. Wlthout such shieldlng. the signal current travel~ng along the central a) a~dal conduc~or will emlt electromagneUc rad~ation to the atmoæphcre, and extraneous electromagnetic radia~on from the atmospbere will be receh~ed by the cen~al aldai conductor.
E:lcc~romagnetic radlation in the radio fre~ucn~y range can prcs~nt at least two problcms. Firstly. incoming radlo fr~qucrl~y radiation interferes wlth the signal carrled by the central axtal conductor. Secondly, mdio ~requen~y radiation emanatlng *om the central a~dal conductor interfere~ with other radio wave recelving equipment in ~he v~cini~r. The Federal Communications Commission (FCC) has promulgated and 3~ erlforces strict r~gulations regarding radio fre~uency emission interference ("RFI").
Improper connections along concentric conductor circuits can arise for several reasons. ~rstly. the connec~don e~uipment is sometimes tmproperly installed or a subse~uent event mav 3 mechanically damage the connection equipment. Secondly. the connection tennini are frequently covered by a coating of oxidation at the time of initial conneclion. Finally. the connecUon termini tend to continue to oxid~ze after installation.
wo ~4/t3040 4 2 1 ~ 8 9 ~
This phenomenon is especially prevalent where the concentric conductor ls made from an aluminum alloy.
l~e prior art contains numerous methods and de~nces to pro~de long-term integrity of the outer conductor circuit. For example. methods and devices which use mechanical techniques for creating an especially strong contact between connection elements and the outer conductor have been tried. However.
these methods and devices are generally expensive and usually require the use of spec~al tools. Also. the methods are of limited ~D value in protecting the connection points ~rom the effects of long-te~m oxidation of the conductor termini by the atmosphere.
Other attempts calculated to provide thc long-term connectton integrlty have used mechanical sealing means to seal off the connection points from the atmosphere. However. these ~5 mcthods usually enta11ed ~xpensive and complex connection equlpment. Also. such mechanical sealing means offer on}y limited value against the long-term di~usion of oxidizlng e~lcments into the connect~on area.
Flnally, several attempts have been madc to seal coa~
:~ cable connections uslng a sealant grease or gel. However. the~e attempts have been found to be less than ~ully satisfactory.
prcsumably because these attempts do not addrcss the problem of inl~lally adst~ng o~dde~ on thc connec~don ten~ni.
Thereforc. thcre is a need for a simple a~d inexpen~
:~s method and devlce for connecting thc coa~dsl cable ~ermin~ in such a way that RFI shidding problems are mlnin~
Summa~y of the Invenffon `~
... , ~
3) The invention satisfies this need as well as many other benefits ob~lous to the skilled artisarl. -The invcntton is a rnethod for connect~ng the tennln~ o~ -two or more coaxial cables wherein the coa~dal cables ha~ ~
central axial conductor and at least one outer conccn~c :}; conductor. The method comprises the steps of: coating the concentric conductors with an oxide abrading sealarlt.
connectlng the central axial connectors. and conncctin.e ~he concentrlc conductors. The oxide abl~din sealant is suff~clent 2~94~
WO 941L3040 5~ uss3l~
abrasi~ e tO abrade awav metal oxides from the concentric corlductor termini during the connection step but is not so abrasive so as to damage the thin foil and/or wire braid at the cable terminus.
s Preferably the sealant is resistant to o~ddation and is insoluble in water. It is also preferable that the sealant has sufficient viscosity to keep it from flowing away from the concentric conductor connection under any anticipated operating conditions.
The invention is also a coupling device for oxidatively - seal~ng a coa~dal cable to a cable port or cable splice. The coupllng devise comprises a cable connector ha~ng at least one connectlon end which contains a seallng amount of an oxide abradlng seallant.
B In a preferred embodiment. the coupling device is adapted to connect a coaxial cable terminus to a standard coa~dal cable connection ~ack. wherein the connectlon ~ack compri~es a body with a connection ~ack aperture and an lnternal electric conductor insulatingly disposed wlthin the body proxlmate to 5D t~he connection~ack aperture. The device comprl~es~
an electrlcally conduct~ve connection.~acl~ attachment moiety compris~ng a connectloIl ~ack attachment moiety and a cable attachment molct~
the conneetion ~ack attachment moie~y deflr~ng a collet 3 structu~.e ha~rlng a base. a base aperture, at least one grease aperture and a pluralit~r of flared i~ngers. and the ~able att.achment moiety having an open ended hollow ~yllnder ~vhlch communicates with the collet base aperture.
where~n ~e connectlon ~ack attachmen~ moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to electrically and shieldingly attach to ~e cable attachment moiet~ wh~le with the concentric conductor a~dally through the collet base aperture. through the connect~on )ack aperture. and 3; into electrical contact with the internal elec~cal conductor~
a hollow. open-ended swagBng shell dlsposed around the connection ~ack attachment moiety and comprising compression moietv and a retraction moien~, the compression , ".
wo g4113040 2164 8 ~ 4 9 K~/USg3111342 ~ ' - moietv being dimensioned tO tightly surround the flared fingers of the connection ~ack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the body of a connection jaclc attached to the tenninus of the cable:
a sealing quantity of sealant disposed within the collet struc~ure: preferably the ~uanti~y of sealant being sufficient to flll at leas~ about 40 percent of the volume defined bv the collet stn~cture: and removable cover means for cooperattng wlth the collet structure to substantlally encapsulate the quant~y of sealant.
Preferably each of the flared fingers in the connection jack connection moiety has a sealant aperture. It is also preferable that the slits between the nared fingers be covered by a thin.
flexible webbing.
In one embodlment. the removable cover mcans comprlses a cap havlng an end cover and a ~ylindrlcal body.
Preferably the cyltndrical body has sufflcient length to seal the sllts betwcen the flared fingers of the collet structure. Also :D preferably, the remo~rable cover ~s adapted to ~nterlock with the collet structure ~n such a way ~hat the cap can~ot be rotated about the cable tenninus independent of thc collet structure.
lhls preferrcd embodlment of the cap allows the cap to be used as a "wrcnch" to make it eas3r for a user to install the connection :~ ~ack attachment molety to the cable te~minus.
The Inventlon provides for the firæt tlme a simple and Inacpenslve method for ensuring RFI shidd~ng of a coaxlal cable ruIl~ even after years of use in outdoor senvlce. The method of the invention is easy to app~ and the device of the imrentlon is 3~ inexpensive and simple and easy to use. An add~t~onal benefit ofthc invention permits retrohWng onto existing coaxial cable runs without special tools or equipment.
Brlef D~ ~ption of tl~
3 , : ~:
These and other features. aspects and advantages of the present invention will become understood with reference to the : :
~. ... . . .
wo 94J~ 21 4 ~ 9 ~ 9 Pcr/uss3nl342 following description. appended claims and accompanying illustrative drawings. where:
Figure 1 is a cross-sectional view of a coaxial cable connec~on system having features of the inv~ntion;
Figure 2 is a prospective view of a conneetlon jack connector having features of the invention;
Figure 3 is a prospective view of an assemblage having features of the invention;
Figure 4 is a cross-sectional view of a second connective ~ ~
D ~ack connector havtng features of the invenffon; ~ ;
Figure 5a is an end vlew of a connection ~ack connector hav~ng web be~ween the flared firlgers; and .
F~gure 5b is an end vlew of a connection ~ack connector ~ ~ ~
haYing an external sleev~ to create a web between the nared ~ -s f~ngers.
, ., ~ , , , ~, ~ r ven~Dn~ ls a method for ic,onnecting the tennini of a) two or more coax~al cables where~n the coaadal cables each have a ccn~al axlal conductor and an outer co~centrl~ conductor.
Thc method com~riscs the steps of coa~~g each of the co~centrlc co~,dtlct~ors with a se~g",a,mount of an o~dde abradi~g, sealant. connecting the central conductors to one 2; anothcr, and;connecting the concentric collductors to one anothcr. Optionally. before the ce~ltral cor~ductors are çonnected to one anot~er. they are also coated wltb the sealant.
~ The ~ealant is sufflc~entl3~ abrasive to re~ve oxldes from the concentric and central coI~ductors. However. tlle sealant is 3 not so abs~sive so as to substant~ally damage the thin foil and/or w~re braid in ~he concentric conductor.
The sealant base material can be prepared from a wide v~riet3r of organic arld inorganic oils. greases and wa~ces. A
suitable sealant is a vegetable oil based grease distributed by Blackburn. Dlv~sion of FL Industrles. lnc. of St. Louis, Missouri under the name "8-3 Coa~tax." Another material whlch has been found suitable as a seala~t is a mixture of about 20% oil and about 80% wax.
,. -, ~, , ,~ ~"
21~9~
WO 94113Q40 8 Pcrlusg3/l~342 :
An abrasive material is added to the sealant base material.
In one embodiment. glass beads having a diameter range be~veen about 0.00001 inches (0.0000254 cm) and about 0.002 inches (0.00508 cm) are added into the sealant. Preferably the s diameters of the glass beads are between about 0.0003 inches (0.000762 cm) and about 0.0008 inches ~0.002032 cm) in diameter. Other dielectric materials besides glass may also be used. such as sand or silica. Also. the abrasive material need not be spherical. For example. glass flbers could be used as the abrasive ma~.
The sealant is preferably chemically resistent to elements present in the amblent environment~ 'rhc sealant should be resistant to oxygen penetration. The seahnt should also be resistant to air pollutants and to organic deg~adants. The sealant is also preferably insoluble in water and in all other llqulds which may contact concaltric conductor connection.
It is 1mportant tlaat the sealarlt be sufflciently v~scous to prc~ent slumping and tlowing under senr~ce conditlons.
Preferably the viscosl~y of the sealarlt at about 68 Fahrenhdt 20_ Celslus) ls a~ least about l,OOO cp~. At about 150 Fahrenheit (66_ Celslus) ~s also preferable that the ~scosi~y of the sealant be at least about 500 cps. The seal~t should not.
however, be so v~scous so that it cannot-be east}y displaced durislg the connect10n procedure or ~ at low temperatures.
~; Ideally, the viscosity-of the seaiant at about 68 ~20_ Celslus) Fahrenhdt is between about 2.~ cps and about 50.000 cps.
aIId at about l50_ Fahreslhdt (66_ Celslus). betwel about 500 cps a~d about l.OOO cps.
As shown in the draw~ngs. the Inven~on is also a coupling 3~ device 8 useful in the connec~on of a coasdal cable tenrlinus 32 to a standard coa~dal cable connection jack 38 us~g Ll~e me~hod of the invention. As used herein. the phrase "standard connection.~ack" refers to that most common connection jack havlng (l) a body 46 with a connect~on jack aperture 76 and :~; (2) an lnternal electrical conductor disposed within. but insulated from the conneetion jack bod~r prox~mate to the connectlon ~ack aperture 76.
.. .. ~ .
., . . - ., . . ..
- 21~89~
WO g4/13044 9 Pcrluss3llu42 The coupling device 8 comprises a connection jack conneclor 10. a hollow swagging shell 12. a quantity of sealant 78 and removable cover means to substantially enca.psulate the quantitv of sealant 78.
The connection jack connector 10 comprises two connection ends. a connection jack attacl~nent moiety 16 and a cable attachment moiety 1~. The connection ~ack attachment moietv 16 has a collet structure with a collet base 20 and a pluralitv of flared fingers 22 which extend outwardly from the base 20 to form a collet attachmen~ cup 24 hav~g a peripheral edge 26. ~.
The collet base 20 defines a central aperture 28 dLmensioned to allow the central conductor 30 of a coa~dal cable terminus 32 to protrude through the collet base 20 into the collet cup 24 without mak~ng electrical contact wlth thc connection ~ack conncctor structure. A typical.circular cent~al apture 28 has a diameter between about 0.15 and about 0.30 inches The 1ngers 22 def~e the. collet cup 24 and providc ar~
:D Inslde cyll~drical engagemerlt surface. 34 suitable for enga~g the outer threaded. surface 36 of a conncctio~ ~a~ 38. lhe ~n~lde surface 34 of the fingers 22 ma~ be s~ootll or it may be provlded u~lth a shallow-cut helical groove. thread or rldg~
Preferably. each finger can have a ddge 40 r~g lateralh~
ZEi acro~s the uridth. of each finger 22. The. pitch;of. ~ ridge 40 ~s se~ to correspond wlth the thread p~tch of .the ~ack 38. In embodiments having the rldge 40. a mQre posit~ve attachmcn~
.~an be achic~red between the connection 3ack connector lO and the connection ~ack 38.
3) Preferably, each finger 22 is formed with a thicke~ed region 44 ad~acent to the chamfer 4;2 and becomes graduall~
thinned toward its connection with the collet base 20. The inside geometry of the collet cup 24 is generally cylindrlc~
when in an unstressed. uncompressed s~ate. When in such 3j unstressed. uncompressed state. the collet cup 24 definc~ a sllghtly curved or frustroconical geometrv. This allows Ihe connection jack attachment moiety lB to be easilv slipped o~rer ~he outside surface 36 of the connection jack bodv 46.
2~489~'3 -WO g4/~40 -10-..
l~e collet cup 24 is dimensioned so that. in its unstressed state. it can be easily slipped over the outer surface of a connection )ack body 46 but. when hoop stress is applied to the external surface of the fingers 22. the connection jack attachment moiety 16 can be tightly connected around the bodv 46 of a connection jack 38.
In a preferred embodiment to be used wlth a jack ha~ng an outslde diameter of 0.375 inches (0.952 cm). the collet stnlcture comprises four fingers 22. each deflning a ~uadrant of a cylinder ha~ing an inside di~neter between about 0.37 inches (0.940 cm) and about 0.38 inches (0.965 cm). Each flnger is betwecn about 0.2 inches (0.50B cm) and about 0.5 inchcs (1.270 cm) long. Each flnger 22 ls separated frcm an ad~acent flnger bv a longitudinal slit 48 whlch can be bet~veen about 0.01 inches (0.0254 cm~ and about 0.1 inche~ (0.254 cm) wide.
preferably between about 0.04 inches (0.101 cm) ~nd about 0.1)5 inches (1.270 cm) u~ide. The flngers 22 may be formed by cross-sa~wing across the collet structure at rlght angles.
Altematively, and preferab~r for mass productlon. the fingers 22 a~ arc formed by a single mad~ ng operatlon of two parallel saws wh~ch movc In one d~rcction across the collet structure.
In a most preferred embodiment. ~he longitudl~al s~lts 48 betwcen the flngers 22 Is covere~ or fllled w~th a thin fle~dble web 49. The ~web 49 ls sufflciently ~e~dbk so as to be read~lv 2i deformed when hoop stress is applled to the collet structure.
Ihe web 49 can be any suitable materlal havtI~g sufficient fladblllt~r. The wcb 49 can be a thln slec~re 51 dl~po~cd over the collet structure as shown in Flgure 5b. For ef~clency of manufacture. thc web 49 is inte~al with the f~ger 48 as shown :~ in Flgure 5a. It has been found that the use of a web 49 improves the dlstribution and abrasive actton of the sealant d~ring installat~on by not allo~nng the sealant to be ~uded OUt through the slits 48.
lhe connection ~ack connector 10 further comprises a 3i cablc attachment moiet~r 18. The cable attachme~ moiety 18 is physically attached to the connectton ~ack attad~ent molety 10 proximate to the collet base 20. The cable attachment molenr 18 ts also adapted to attach to the coa~al cable terminus 32 in ;. . : . .
-.
: , . ~ . ~ .. , 21~89 ~
such a way that the cable attachment moiety 18 is in electrical contact with the concentric conductor 50 of the cable terminus 32 while the central conductor 30 Is caused to protrude axially through the collet base aperture 28 and into the center of the collet cup 24.
l~e cable attachment moiety 18 can be any of the standard crimp-on varieties commonly known in the industry. The cable attachment moiety 18 can also be one of the several types disclosed in U.S. Patent Application Serial No. 07/364.917.
D which is completely tncorporated herein by reference for all purposes.
Preferably. however. the cable attachment molety 18 is a screw mandrel 52 having ~) a cylindrical mandrel element 54 and. (2) a hel~cal knife-blade ridge 56 whlch forms a screw s thread deflned on the exteI~ior of the mandrel element 54. The mandrel element 54 is generally cyl~ndrical ha~lng an outside diamcter eho8en for use wlth the size of the cable outside dlameter wlth whlch it ls to be used. For RG59 cable. the preferred outside diameter of the mandrel element 54 is :D betwecrl about 0.20 and about 0.21 inches. ~erably. the mandrel element 54 ~s sl~ghtly frustroconlcal for ease of insertion. Also. 1I1 a typical embodiment. thc portton of the mandrel clement 54 distal from the collet ba~e 20 ls thlnned to provlde a sharp reanvard openi:~g 58. The hdical Im~fe-blade $ ridge 56 has a height wh~ch is between about 0.02 inches (0.0508 cm) and about 0.06 inches ~0.152 cmJ. preferably between 0.038 Inches (0.0965 cmJ ~nd 0.042 inches (0.107 cm). and is formed as a a~utely angled pro3ectioIl extending f~om thc mandrel element 54. In a preferred embodiment. the 3) "threads" which are formed by knife-edge ridge 56 are 60 angle threads and are disposed at about 8 tO about 16 threads per inch. preferably between about 11 to al~out 13 threads per Inch labout 4 to 5 threads per centimeter).
The hel~cal lmife-blade ridge 56 is shaped so as to bite 3 sufficie~tly into the metal braid 60 which forms the concent~c conductor 50 in most coaxial cable. Such a helical knife-blade ridge 56 has also been shown to provide a secure mechanical attachment to the coa~dal cable terrninus 32 wlthout causin~ the - - - :-.
-':
: ', wo s4n3040 -12- PCr/uss3nl342 metallic strands which form the braided concentric conductor 50 to s~ear or break off. An effective compromise between sharpness and dullness of the knife-blade edge rldge 56 ~s to make it flat across for about two to three s~ils. A one mil flat is s too sharp and will result in shearing the f~ne wlre braid 60;
~hile an eight-mil radius at the edge has been found to be too dull with resultant slippage of the braid under tension. Ideally, the knife-blade ridge 56 should sub~ect the braid wires to shear stresses without actually resulting in shearing.
The use of a helical knife-blade rldge 56 on the cable attachment moiety 18 of the connection 3ack connector 10 has been ~ound to be particularly advantageous in order to facilltate easy ~nsulation of the conncction ~ack connector 10 onto thc coa~dal cable 62, especially at low ambient tempcral ures.
~s The connection ~ack conneetor 10 ls made from an electrieally conductive material. usually a mctal. Alum~num 1~ a h~ghly preferred such metal beeause lt is llght welght.
in~si~re and htghly co~ductlve. Where tbe cable attaehment moiety 18 eomprlses a serew mandrel 52 a~d the eable a) attaehment molety 18 ~s made from alu~num. another conduetlve material. sueh as a tln allor. ls prefierably applied to the acter~or of the mandrel elemen~ 54 to proYlde additio~al lubrlclt~r to the ex~erior of the mandrel dement 54 and to facilitatc the insert~on o~ the mandreI- element 54 into ehe 2s coaodal cable ten~nus 32.
Thc swagglng shell 12 has an open-endcd hollow tubular ~hape. The sw~ng shell 12 has a compresston moiel;y 64 and a retraction moiet~r 66. The compression moletar 64 Is adapted to~apply hoop stress to the exterior of thc collet f~ngers 22 on the connection ~ack connector 10 and the retraction moie~y 66 is adapted to interface wlth one or more tools adapted to drlve the swagging shell 12 over the collet fingers 22 and/or.
altern~tively. to retract the compression moiety 64 off of. and away from. the collet fingers 22.
3; The compression moie~ 64 is generallv cylindrical and is dlmensioned to be slldable over the collet ~ngers 22 in such a way as to impart considerable hoop stress to the collet fingers 22. thereby causing the collet fingers 22 to ti~htlv grip the wo wl = 2 1 4 8 9 ~
extefior surface 36 of the connection jack body 46. For a standard jack having an outside diameter of about 0.375 inches (0.95 cm). the inside diameter of the compression moiety 64 is ~picallv between about 0.40 inches (1.02 cm3 and about 0.42 s inches 11.0~ cm), preferably between about 0.41 inches (1.04 cm) and 0.415 inches (1.054 cm).
The retraction moie~r 66 of the swagglng cylinder 12 is also typically cylindrical. It is attached to the compression moietv 64 in such a way that the longitudinal axes of the compression moiet~r 64 and the retractlon molety 66 are coaxial.
The inside diameter of the compress~on moiety 64 is dimensioned to allow the retraction moiety 66 to sllp freely along the outside of the coaxial cable 62. In a preferred embodiment. the outside diameter of the retraction moiety 66 is ~5 dimensioned to be sllghtly'smaller than the outslde dlametcr of the compresslon mole~ 64 so *at an annular shoulder 68 is formed at the interface of the retr~c~ion molet~r 66 and the compression mole~ 64. In a typlcal embodiment. the annular shoulder 68 is behveen about 0.10 inches (0.254 cm~ and about 5D 0.20 Inches (0.51 cm) in wldth. Such annular shoulder 68 p~ des a surf~ce aga~nst which an a~dal force can be appl~ed so as to urge the swagglng shell 12 over the collet flngers 22.
In another preferred embodiment. the a~tertor surface 70 of the retractiorl molety 66 is prov~ded with indenta~ons. ridges 2i or other stnacture capable of provlding a surf~ce against which aforce can be applied to the swagglng sbell 12 to urge the swagging shell 12 off of the collet flngers 22. In a most preferred embodiment. such structure is pr~vided by external screw threads 72.
3~ The swagging shell 12 is made from a rigid material capable of withstanding the pressures and wear and tear resulting from its interac~cion u~ith the collet f~ngers 22 and wi~
various driving and retraction tools. Typically. the swagging shell 12 ls made from a metal. such as a br~ss. an aluminum or a steel.
Where the connection ~ack connector 10 comprises a snandrel element 54 which is physically inserted into the coa~fial cable terminus 32 (such as the screw mandrel 52 described 21~9 ~i WO 94/13040 14-- PCTIIlS93/11342 above). ~he swagging shell 12 is preferably constructed so that the internal diameter of the retraction moiety 66 is smaller than the internal diameter of the compression moiety 64. and the interior surface 74 of the swagging shell 12 at the interface s between the retraction molety 66 and the compression moietv 64 ls beveled. Also. the internal diameter of the retraction moiety 66 can be dimensioned so as to apply a compressive force to the exterior of the cable terminus 52 in the region of the tenninus 52 wherein has been inserted a connection ~ack D CO~I~leCtOr 10 having a mandrel-1~pe conncction ~ack attachment moiet~ 18. In such an embodiment. the indde diameter of the retraction moiet~r 66 is dimensioned to be about the same or only slightly larger than the outslde dlameter of the cable t~us 32 after insertion of the mandrel eleme~t 54. Such a ; swag~ng shell 12 can be used to apply compresslve force to thc exterlor of a coax~al cable tennlnus 52 having Inserted thereln a cable attachment molety 18 comprising a mandrel ele~nent 54.
Such compressive force is effcct~ve in sec~ing and ma~ntalnlng a positive electrical connection bet~vccn the concen~c SD conductor 30 of the coa~dal cable 62 and the mandrcl da~S4 of the connectlon ~ack connector cable attaehmcnt motety 18.
In a preferred method of installing a connec~on ~a~
con~ector 10 havlng a mandrel demalt 54 to the coa~al cable ~; tcrminus 32. strands of the metal braid 60 which form ~heconcen~ic conductor 50. are disposed around the exterlor of thc collct flngers 22 and are held fast agalnst the ~ngers æ bv - tllc compression moiety 16 of the swagg~g shell 12. rhls installation method has been found to prov,ide a super~or 3) electrical connection between the cable attachmalt moiety 18 of the connectton ~ack connector 10 and thc concentric conductor 50, a connection which will not fail e~lren after numerous temperature cycles.
Figure 1 Illustrates how the swagglng shell 12 comprc~es the connectton ~ack connector 10 to form a ~ght eonncct~on wtth the cable terminus 32 and the connee~on ~ack 38. ~ -Sealants useful in the dev~ce have been descrlbed abo~
In a prefe~red embodiment the quantity of sealant is sufficlent t-~
WO 94/13040 - 2~5~ 8 ~ ~ ~ YCTIUS~311~2 fill at least about fffly percent of the volume def~ned by the collet s~ucture. most preferably at least about sixty percent.
Preferably the connection.~ack attachment moiety 16 has a pluralitv of sealant apertures 80. In a typical embodiment. each of the nared flngers 22 has one sealant aperture 80 defined near the collet base 20. T~picallv the sealant aperture 80 is round and has a diameter between abou~ 0.3 inches (0.76 cm) and about 0.4 inches (1.02 cm). preferably about 0.325 lnches (0.826 cm) and about 0.363 inches (0.922 cm).
~D AS shown in the drawlngs, the removable cover means can comprise a cap 82 havlng an end cover 84 and a cylindrical body 86. Pre~rably the cyllndrical body 86 has sufflcierlt length to scal the slits 48 between the nared flngers 22 of the collet s2nucture.
In another preferred~embodiment. the removable cover means ~nterloc}cs with the collet stn~cture in such a ~vay that the removable cover means cannot be rotatcd abo~e the cable terminus 32 independent of the collet structure. In thls embodimcnt. the remo~rable cover means can be used as a a~ ~wrench" to turn the collet structure wlth re~pect to the cable tcrminus 32. This ls an important feature of the connection devlce in embod~nents havlng a threaded mandrel S2 whieh is screued asld unscrewed into the cable termirlus 32. Where the removable cover means interloc~ vv~th the collet structure. the 2; removable cover mean~ can be easily emplayed b~ the user to t~read the mandrel 52 into the term~nus 32 w~thout the need of any ldnd of tool.
Us~ng the device described above. the method of the invent~on can be employed to connect a coa~dal termlnus to a 3) standard connection jack 38 by the s~eps of attaching the electrically conductive connection jack connector 10 to the tenninus 38 of the cable 62. placing ~e connection jack connector 38 over the connection jack 10. and sllding the swagglng shell 12 over the nared f~ngers 22 of the connectton $ .~ad~ connector 38.
It has been found that the mere placing of the connection ~ack connector l O over the connection iack 38 causes the sealant to not onlv ooze rearwardly out of ~.~ sealant aperture~s~
~ . ~
wo ~4n3040 l~i-- Pcr/uss3/11342 80. but also to ooze out of the slits 48 between the flared fingers 2:2 and out of the rearward cpening 58 of the cable attachment moiety 18. This action causes sealant 78 to thoroughly coat under. oYer and throughout the concentric conductor terminus.
and on the lnside and outside suriaces of the cable attachment moiety 18. Thus. the entirety of the concentric conductor terminus is thorougUy coated with the seallant 78 and is thereb3 protected from o~dda~on.
lhe foregoing describes in detail sevcral preferred embodiments of the invention. The foregoing should not be construed. however. as limlting the invention to the particular e~nbodiL~nerlts desc~ibes. E'rac~tioners skllled ln thc art wlll recogr~ze numerous other embodiments as well. For a definition of the complete scope of the inventton. the reader is directed to the appended clalms.
Claims (18)
1. A method of connecting a coaxial terminus to a standard connection jack, wherein the connection jack comprises (1) a body with a connection jack aperture, and (2) an internal electrical conductor disposed within, but insulated from, the body proximate to the connection jack aperture, the method comprising the following steps:
a. attaching an electrically conductive connection jack connector to the terminus of the cable; and b. sliding a hollow, open-ended swagging shell over the flared fingers of the connection jack connector;
wherein the connection jack connector comprises a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
wherein a quantity of sealant is disposed within the collet struture, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet struture; and Claims wherein the swagging shell comprises a compression moiety and a retraction moiety and the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector thereby applying hoop stress to the fingers so as to urge the flared fingers into tight connection with the threaded body of the connection jack; whereby, when the swagging shell is slid over the flare fingers of the connection jack connector, the flared fingers are urged inwardly forcing some of the conductive grease to flow out through the sealant aperture.
a. attaching an electrically conductive connection jack connector to the terminus of the cable; and b. sliding a hollow, open-ended swagging shell over the flared fingers of the connection jack connector;
wherein the connection jack connector comprises a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
wherein a quantity of sealant is disposed within the collet struture, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet struture; and Claims wherein the swagging shell comprises a compression moiety and a retraction moiety and the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector thereby applying hoop stress to the fingers so as to urge the flared fingers into tight connection with the threaded body of the connection jack; whereby, when the swagging shell is slid over the flare fingers of the connection jack connector, the flared fingers are urged inwardly forcing some of the conductive grease to flow out through the sealant aperture.
2. The method of claim 1 wherein the sealant has a viscosity at 68 degrees Fahrenheit of at least about 1,000 cps.
3. The method of claim 1 wherein the sealant has a viscosity at 150 degrees Fahrenheit of at least about 500 cps.
4. The method device useful in the connection of a coaxial cable terminus to a standard coaxial cable connection jack, wherein the connection jack comprises (1) a body with a connection jack aperture and (2) an internal electrical conductor disposed within but insulated from, the body proximate to the connection jack aperture, the device comprising:
a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a cooled structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers separated from one another by a narrow slit, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack Claims and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a hollow, open-ended swagging shell disposed around the connection jack attachment moiety and comprising a compression moiety and a retraction moiety, the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the body of a connection jack attached to the terminus of the cable;
c. a quantity of oxide abrasive sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet structure; and d. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a cooled structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers separated from one another by a narrow slit, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack Claims and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a hollow, open-ended swagging shell disposed around the connection jack attachment moiety and comprising a compression moiety and a retraction moiety, the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the body of a connection jack attached to the terminus of the cable;
c. a quantity of oxide abrasive sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet structure; and d. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
5. The device of claim 1 wherein the sealant comprises beads having diameters between about 0.0001 inches and about 0.002 inches.
6. The device of claim 4 wherein the sealant comprises beads having diameters between about 0.0001 inches and about 0.002 inches.
7. The device of claim 4 wherein the sealant is resistant to oxidation, is insoluble in water and has a viscosity at 68 F between about 1,000 cps and about 100,000 cps.
8. The device of claim 4 wherein the quantity of sealant is sufficient to fill at least about 60 percent of the volume defined by the collet structure.
Claims
Claims
9. The device of claim 4 wherein the connection jack connection moiety has a plurality of sealant apertures.
10. The device of claim 4 wherein the connection on jack connection moiety has one sealant aperture in each of the flared fingers.
11. The device of claim 4 wherein the slits between the flared fingers are covered by a web.
12. The device of claim 4 wherein the sealant aperture is round and has a diameter between about 0.3 inches and about 0.4 inches.
13. The device of claim 4 wherein the removable cover means comprises a cap having an end cover and a cylindrical body.
14. The device of claim 4 wherein the removable cover means interlocks with the collet structure in such a way that the removable cover means cannot to rotated about the cable terminus independent of the collet structure.
15. The device of claim 4 wherein the cable connection moiety of the connection jack connector is a mandrel which is disposed between the central conductor and the concentric conductor
16. The device of claim 4 wherein the swagging shell is cylindrical and the inside diameter of the compression moiety is larger than the inside diameter of the retraction moiety and the inside diameter of the retraction moiety is dimensioned to urge the concentric conductor into tight contact with the mandrel.
17. A connection jack connector useful in the connection of a coaxial cable terminus to a standard coaxial cable connection jack, wherein the connection jack comprises (1) a body with a connection jack aperture, and (2) an internal electrical conductor disposed within, but insulated from, the body proximate to the connection jack aperture, the connection jack connector comprising:
Claims a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a quantity of sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet structure; and c. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
Claims a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a quantity of sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet structure; and c. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
18. A kit useful in the connection of a coaxial cable terminus to a standard coaxial cable connection jack, wherein the connection jack comprises (1) a body with a connection jack aperture and (2) an internal electrical conductor disposed within, but insulated from, the body proximate to the connection jack aperture, the kit comprising:
a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, Claims the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a hollow, open-ended swagging shell comprising a compression moiety and a retraction moiety, the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the threaded body of a connection jack attached to the terminus of the cable;
c. a quantity of sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet struture; and d. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
a. an electrically conductive connection jack attachment moiety comprising a connection jack attachment moiety and a cable attachment moiety, Claims the connection jack attachment moiety defining a collet structure having a base, a base aperture, at least one sealant aperture and a plurality of flared fingers, and the cable attachment moiety having an open ended hollow cylinder which communicates with the collet base aperture, wherein the connection jack attachment moiety is dimensioned to attach snugly around the body of the connection jack and the cable attachment moiety is dimensioned to attach to the coaxial cable terminus in such a way that, when the connection jack connector is attached to the cable terminus, the cable attachment moiety can be placed in electrical contact with the concentric conductor with the central conductor protruding axially through the collet base aperture, through the connection jack aperture, and into electrical contact with the internal electrical conductor;
b. a hollow, open-ended swagging shell comprising a compression moiety and a retraction moiety, the compression moiety being dimensioned to tightly surround the flared fingers of the connection jack connector so as to apply hoop stress thereto and so as to urge the flared fingers into tight connection with the threaded body of a connection jack attached to the terminus of the cable;
c. a quantity of sealant disposed within the collet structure, the quantity of sealant being sufficient to fill at least about 40 percent of the volume defined by the collet struture; and d. removable cover means for cooperating with the collet structure to substantially encapsulate the quantity of sealant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/981,974 US5362250A (en) | 1992-11-25 | 1992-11-25 | Coaxial cable connection method and device using oxide inhibiting sealant |
| US07/981,974 | 1992-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2148949A1 true CA2148949A1 (en) | 1994-06-09 |
Family
ID=25528774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002148949A Abandoned CA2148949A1 (en) | 1992-11-25 | 1993-11-22 | Coaxial cable connection method and device using oxide inhibiting sealant |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US5362250A (en) |
| EP (1) | EP0671062A1 (en) |
| JP (1) | JP3267622B2 (en) |
| KR (1) | KR950704836A (en) |
| BR (1) | BR9307487A (en) |
| CA (1) | CA2148949A1 (en) |
| WO (1) | WO1994013040A1 (en) |
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-
1993
- 1993-11-08 US US08/335,602 patent/US5490803A/en not_active Expired - Fee Related
- 1993-11-22 WO PCT/US1993/011342 patent/WO1994013040A1/en not_active Application Discontinuation
- 1993-11-22 EP EP94901647A patent/EP0671062A1/en not_active Withdrawn
- 1993-11-22 BR BR9307487A patent/BR9307487A/en not_active Application Discontinuation
- 1993-11-22 CA CA002148949A patent/CA2148949A1/en not_active Abandoned
- 1993-11-22 KR KR1019950702160A patent/KR950704836A/en not_active Application Discontinuation
- 1993-11-22 JP JP51331394A patent/JP3267622B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3267622B2 (en) | 2002-03-18 |
| US5490803A (en) | 1996-02-13 |
| US5362250A (en) | 1994-11-08 |
| JPH08503809A (en) | 1996-04-23 |
| EP0671062A1 (en) | 1995-09-13 |
| WO1994013040A1 (en) | 1994-06-09 |
| KR950704836A (en) | 1995-11-20 |
| BR9307487A (en) | 1999-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19981123 |