CA1043228A - Accumulator drain - Google Patents
Accumulator drainInfo
- Publication number
- CA1043228A CA1043228A CA280,725A CA280725A CA1043228A CA 1043228 A CA1043228 A CA 1043228A CA 280725 A CA280725 A CA 280725A CA 1043228 A CA1043228 A CA 1043228A
- Authority
- CA
- Canada
- Prior art keywords
- bore
- annular
- seal
- conduit
- shoulder
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
- F16L41/14—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe by screwing an intermediate part against the inside or outside of the wall
-
- 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
- Y10S285/00—Pipe joints or couplings
- Y10S285/924—Vented
-
- 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
- Y10T137/00—Fluid handling
- Y10T137/9029—With coupling
Abstract
ACCUMULATOR DRAIN
A B S T R A C T
The hydraulic control system including an accumulator includes a safety connecting means for connecting the accumulator to the system so that partial disengagement of the connecting means automatically vents the accumulator to the sump of the hydraulic system.
A B S T R A C T
The hydraulic control system including an accumulator includes a safety connecting means for connecting the accumulator to the system so that partial disengagement of the connecting means automatically vents the accumulator to the sump of the hydraulic system.
Description
~43;~Z~
The present invention relates generally to hydraulic -systems and pertains particularly to a sa~ety connector ~ -for use for example for connecting an accumulator to control means in such systems. ~ ' ; Many hydraulic systems may utillze accumulators for accumulating and maintaining a supply Or pressurized fluid ,' ~or ensuring a supply of pressurized ~luid ~or certain ' '~
functions within the system. Such accumulators may be ' employed in intermittently operated hydraulic systems or `' 10 may be employed as a back-up system in other hydraulic ,~ systems. Such accumulators are also ~requently employed as ' -~
a safety means in hydraulic systems should the prime mover ' , supplying the system with fluid under pressure fail so that ~, brakes, clutches and the like can be either set or released '~ ' '~ and loads which are suspended may be lowered for safety reasons~ ' "
; Such hydraulic systems occasionally need maintenance ~, or repair of a nature which requires the removal of one or '''~' more components ~rom the system. Under such conditions it '' ' is desirable that fluid under pressure be bled from the system ' to reduce waste of fluid, or the danger of fluid leaking- or being sprayed on to an engine exhaust manifold or the like , ~ with the resultant danger of fire. Such systems are frequently ';~
i such as to maintain ~luid pressure within the accumulator '''- ' $ until the accumulator is deliberately bled by an operator or maintenance crew. It is desirable, however, that automatic ' ''',,~ ' means be provided for b,leeding the accumulator ~n cas,e~ -' ¦ this is overlooked by the operator or maintenance crew~
Failure to bleed the system can result in conduits, hoses :, ;1 and the like being propelled at high velocity through the ' ;¦ 3 air by means of the high pressure fluid when these components ~,~ , ', ` ' -1-` '' .
.
i~432~
are disconnected from the system.
Also, it is advantageous to have automatic bleed means available to vent and drain any hydraulic line, regardless of pressure~ prior to complete disconnection to prevent spillage, loss of fluid and hazardous conditions caused by fluid on the floor upon which maintenance personnel or operators could slip~
It is a primary ob~ect of the present invention to provide for such automatic bleeding of hydraulic systems.
According to this invention, there is prov~ded a ; hydraulic system having fluid control means, a source of i fluid under pressure, and conduit means connectlng the source ~ to the control means, the conduit means including disconnect~
?~ able connecting means to enable the source to be disconnected 3 from the control means, wherein the connecting means includes vent means which automatically vents the source as soon as the connecting means is partiall~ disconnected~
Pref`erably, the connecting means includes a bore defining an outlet port communicating with a passage in ' 20 communicatlon with the control means and an annular member ~' engaged in the bore and connecting one end of the conduit means to the port to establish communication between the conduit and the passage, and a vent passage communicates with -the bore between the ends thereof so that partial removal of the annular member from the bore brings the conduit and the bore into communication with the vent passage.
Two examples of hydraulic sy~stems in accordance with the invention ~ill now be described with reference to ~ the accompanying drawings, in which ~
j 30 ~igure 1 is a layout diagram of one hydraulic 'I .' , .
i ~ . ' , '.
'i ` ~ ,.
,: , . . , .
~3~32~
system, Figure 2 is a sectional view to a larger scale of the connecting means in the example of ~igure l; and, Figure 3 is a sectional view similar to Figure 2, but of an alternative emb~dlment of the connecting means.
'' '. ,';' ~ ' I ' .
.'. ~,:'' `
: ' "' ' ~`."";'.
~, ``I ..
.~, .1 .
, .,, ~" .
' ~2a~ : .
, ', ' `,'. ' ","', '' ~,'.. ', :
3;2~
Turning now to Fig. 1 of the drawing there is illustrated a hydrauIic system indicated generally by the numeral 10 comprising a pump 11 supplying pressurized fluid by way of a conduit 12 including a check valve 13 to a control system including a housing 14. The housing 14 defines a chamber 15 in which a valve assembly 16 is mounted for controlling one or more motors, brakes and clutches or the like for a system. The valve 16 is supplied with fluid by way of an inlet conduit or passageway 17 which is in communication with the supply conduit 12. A branch passage 18 is connected by way of detachable conduit means 19 with an accumulator 20. ~-i The pump 11 and the accumulator 20 may both be generally ~;
referred to as sources of pressurized fluid. The detachable conduit 19 is connected to the passage 18 by way of a ¦ port and by means of a safety connecting means indicated -~
generally at 21. The safety connecting means may be utilized between any source of pressurized fluid and the system or components within the system, and is not , intended to be utilized solely between an accumulator, as illustrated. The pump 11 draws fluid by way of a conduit 22 from a sump 23 within the housing 14.
~ The valve assembly 16 can include one or more ;i valves and is operative to communicate by means of a ~`~
I ' .
,' plurality of control lines 24, 25 and 26 for controlling ij one or more motors, brakes or the like. `-~ Turning now to Fig. 2 there is illustrated in d~ detail the construction of the safety connector assembly 21. The connector includes an enlarged bore coaxially ¦ with passage 18 defining a port 27 having internal threads i formed t~lerein. A shoulder 28 is formed at the ~uncture l of the enlarged bore 27 and the passage 18.
;i _3_ ~L~34;~8 A ~itting 29 is connected to the end of hose or conduit 19 and defines a shoulder 30 which is engaged by a shoulder 31 of a threaded collar 32. The threaded collar ~-32 engages the abutting shoulder 31 of the fitting 29 and ~ -includes external threads cooperatively engaging the threads of the bore 27 for securing the fitting 29 within the bore 27. The fitting 29 includes an annular seal lip . .
or ring 33 which engages an annular disc-like seal 34 ~
against shoulder 28. A vent passage 35 communicates with . : :
the bore 27 outward from the seal 34 and seal face 33.
It will be appreciated that in the position as j shown in Fig. 2 the fluid communicates by way of conduit 19 .:~ with passageway 17 as long as the members 33 and 34 are -~
in engagement and effective. However, once the seal is ; ,,.- :.. :
broken between the member 29 and the seal faces 33, and .~. .
3LI by partial disengagement of the connecting means ~luid within the conduit 19 can immediately begin . :: . ~.:
communicating with the vent passage 35 with communicates . with the Lnterior 15 of houslng lLI and the sump 23.
. Thus, the accumulator 20 will be vented automatically ~¦ upon partial disengagement or the beginning of removal ~ .
.~, . . .,~ of the ~ltting or connecting means 21. : ::
Turning now to the embodiment of ~ig. 3 an .
alternate embodiment is illustrated wherein equivalent .
. . .....
. or identical elements as in the previous embodiment are 1 identified by the same numeral primed. In this embodiment, ~ .
~ -¦ the conduit 19' is connected for supplying high pressure ¦ fluid from an accumulator (not shown) with a passage 18 ' in a housing 14 ~ having a vent passage 35 ' . In this :
embodiment a bore 36 concentric with passage 18 ' includes . a tapered shoulder 37 and a radial shoulder 38 formed ., between the bore 36 and the passage 18 ~ . A seal member 39 . fits within the end of the bore 36 at the ~uncture thereof ~ :
'~ '. '' ' '.
~ A -4-., ' .
~04;~ %8 with passage 18 and includes a substantially conical shaped seal ~ace 4Q. A fixture 41 connected to the end of conduit 19 ihcludes a seal face 42 engaging conical seal face 40 of the seal member 39. ~his fixture 41 is biased into place within the bore 36 by means of threaded collar 43 including external threads thereon threadably~ engaging internal threads within bore 36 and including a substantially concial forward shoulder 44 engaging an abutting shoulder 45 on the fixture member or fitting member 41~
la As in the previous embodiment it will be appreciated that when the threaded member 43 is backed off from its po~ -sition within bore 36 such that the seal faces 40 and 42 disengage and separate, then fluid within conduit 19 will flow outward through vent passage 35~ into the sump of the system.
With this arrangement the accumulator of the system will be automatically vented as soon as an operator or other person begins disconnecting the connection thereo~ to the remalnder of the system.
While the present invention has been described and 1 2Q illustrated by~ means of specific embodiments, it is to be under--' stood that numberous changes and modi~ications may be made therein without departing from the spirit and scope of the invention as .~ ,,. ~; .
) de~ined in the appended claims.
.' ' ~ ~ .'' ;
' , .
. ~ .
~ ~5~ ~
- - . . . , :: ,
The present invention relates generally to hydraulic -systems and pertains particularly to a sa~ety connector ~ -for use for example for connecting an accumulator to control means in such systems. ~ ' ; Many hydraulic systems may utillze accumulators for accumulating and maintaining a supply Or pressurized fluid ,' ~or ensuring a supply of pressurized ~luid ~or certain ' '~
functions within the system. Such accumulators may be ' employed in intermittently operated hydraulic systems or `' 10 may be employed as a back-up system in other hydraulic ,~ systems. Such accumulators are also ~requently employed as ' -~
a safety means in hydraulic systems should the prime mover ' , supplying the system with fluid under pressure fail so that ~, brakes, clutches and the like can be either set or released '~ ' '~ and loads which are suspended may be lowered for safety reasons~ ' "
; Such hydraulic systems occasionally need maintenance ~, or repair of a nature which requires the removal of one or '''~' more components ~rom the system. Under such conditions it '' ' is desirable that fluid under pressure be bled from the system ' to reduce waste of fluid, or the danger of fluid leaking- or being sprayed on to an engine exhaust manifold or the like , ~ with the resultant danger of fire. Such systems are frequently ';~
i such as to maintain ~luid pressure within the accumulator '''- ' $ until the accumulator is deliberately bled by an operator or maintenance crew. It is desirable, however, that automatic ' ''',,~ ' means be provided for b,leeding the accumulator ~n cas,e~ -' ¦ this is overlooked by the operator or maintenance crew~
Failure to bleed the system can result in conduits, hoses :, ;1 and the like being propelled at high velocity through the ' ;¦ 3 air by means of the high pressure fluid when these components ~,~ , ', ` ' -1-` '' .
.
i~432~
are disconnected from the system.
Also, it is advantageous to have automatic bleed means available to vent and drain any hydraulic line, regardless of pressure~ prior to complete disconnection to prevent spillage, loss of fluid and hazardous conditions caused by fluid on the floor upon which maintenance personnel or operators could slip~
It is a primary ob~ect of the present invention to provide for such automatic bleeding of hydraulic systems.
According to this invention, there is prov~ded a ; hydraulic system having fluid control means, a source of i fluid under pressure, and conduit means connectlng the source ~ to the control means, the conduit means including disconnect~
?~ able connecting means to enable the source to be disconnected 3 from the control means, wherein the connecting means includes vent means which automatically vents the source as soon as the connecting means is partiall~ disconnected~
Pref`erably, the connecting means includes a bore defining an outlet port communicating with a passage in ' 20 communicatlon with the control means and an annular member ~' engaged in the bore and connecting one end of the conduit means to the port to establish communication between the conduit and the passage, and a vent passage communicates with -the bore between the ends thereof so that partial removal of the annular member from the bore brings the conduit and the bore into communication with the vent passage.
Two examples of hydraulic sy~stems in accordance with the invention ~ill now be described with reference to ~ the accompanying drawings, in which ~
j 30 ~igure 1 is a layout diagram of one hydraulic 'I .' , .
i ~ . ' , '.
'i ` ~ ,.
,: , . . , .
~3~32~
system, Figure 2 is a sectional view to a larger scale of the connecting means in the example of ~igure l; and, Figure 3 is a sectional view similar to Figure 2, but of an alternative emb~dlment of the connecting means.
'' '. ,';' ~ ' I ' .
.'. ~,:'' `
: ' "' ' ~`."";'.
~, ``I ..
.~, .1 .
, .,, ~" .
' ~2a~ : .
, ', ' `,'. ' ","', '' ~,'.. ', :
3;2~
Turning now to Fig. 1 of the drawing there is illustrated a hydrauIic system indicated generally by the numeral 10 comprising a pump 11 supplying pressurized fluid by way of a conduit 12 including a check valve 13 to a control system including a housing 14. The housing 14 defines a chamber 15 in which a valve assembly 16 is mounted for controlling one or more motors, brakes and clutches or the like for a system. The valve 16 is supplied with fluid by way of an inlet conduit or passageway 17 which is in communication with the supply conduit 12. A branch passage 18 is connected by way of detachable conduit means 19 with an accumulator 20. ~-i The pump 11 and the accumulator 20 may both be generally ~;
referred to as sources of pressurized fluid. The detachable conduit 19 is connected to the passage 18 by way of a ¦ port and by means of a safety connecting means indicated -~
generally at 21. The safety connecting means may be utilized between any source of pressurized fluid and the system or components within the system, and is not , intended to be utilized solely between an accumulator, as illustrated. The pump 11 draws fluid by way of a conduit 22 from a sump 23 within the housing 14.
~ The valve assembly 16 can include one or more ;i valves and is operative to communicate by means of a ~`~
I ' .
,' plurality of control lines 24, 25 and 26 for controlling ij one or more motors, brakes or the like. `-~ Turning now to Fig. 2 there is illustrated in d~ detail the construction of the safety connector assembly 21. The connector includes an enlarged bore coaxially ¦ with passage 18 defining a port 27 having internal threads i formed t~lerein. A shoulder 28 is formed at the ~uncture l of the enlarged bore 27 and the passage 18.
;i _3_ ~L~34;~8 A ~itting 29 is connected to the end of hose or conduit 19 and defines a shoulder 30 which is engaged by a shoulder 31 of a threaded collar 32. The threaded collar ~-32 engages the abutting shoulder 31 of the fitting 29 and ~ -includes external threads cooperatively engaging the threads of the bore 27 for securing the fitting 29 within the bore 27. The fitting 29 includes an annular seal lip . .
or ring 33 which engages an annular disc-like seal 34 ~
against shoulder 28. A vent passage 35 communicates with . : :
the bore 27 outward from the seal 34 and seal face 33.
It will be appreciated that in the position as j shown in Fig. 2 the fluid communicates by way of conduit 19 .:~ with passageway 17 as long as the members 33 and 34 are -~
in engagement and effective. However, once the seal is ; ,,.- :.. :
broken between the member 29 and the seal faces 33, and .~. .
3LI by partial disengagement of the connecting means ~luid within the conduit 19 can immediately begin . :: . ~.:
communicating with the vent passage 35 with communicates . with the Lnterior 15 of houslng lLI and the sump 23.
. Thus, the accumulator 20 will be vented automatically ~¦ upon partial disengagement or the beginning of removal ~ .
.~, . . .,~ of the ~ltting or connecting means 21. : ::
Turning now to the embodiment of ~ig. 3 an .
alternate embodiment is illustrated wherein equivalent .
. . .....
. or identical elements as in the previous embodiment are 1 identified by the same numeral primed. In this embodiment, ~ .
~ -¦ the conduit 19' is connected for supplying high pressure ¦ fluid from an accumulator (not shown) with a passage 18 ' in a housing 14 ~ having a vent passage 35 ' . In this :
embodiment a bore 36 concentric with passage 18 ' includes . a tapered shoulder 37 and a radial shoulder 38 formed ., between the bore 36 and the passage 18 ~ . A seal member 39 . fits within the end of the bore 36 at the ~uncture thereof ~ :
'~ '. '' ' '.
~ A -4-., ' .
~04;~ %8 with passage 18 and includes a substantially conical shaped seal ~ace 4Q. A fixture 41 connected to the end of conduit 19 ihcludes a seal face 42 engaging conical seal face 40 of the seal member 39. ~his fixture 41 is biased into place within the bore 36 by means of threaded collar 43 including external threads thereon threadably~ engaging internal threads within bore 36 and including a substantially concial forward shoulder 44 engaging an abutting shoulder 45 on the fixture member or fitting member 41~
la As in the previous embodiment it will be appreciated that when the threaded member 43 is backed off from its po~ -sition within bore 36 such that the seal faces 40 and 42 disengage and separate, then fluid within conduit 19 will flow outward through vent passage 35~ into the sump of the system.
With this arrangement the accumulator of the system will be automatically vented as soon as an operator or other person begins disconnecting the connection thereo~ to the remalnder of the system.
While the present invention has been described and 1 2Q illustrated by~ means of specific embodiments, it is to be under--' stood that numberous changes and modi~ications may be made therein without departing from the spirit and scope of the invention as .~ ,,. ~; .
) de~ined in the appended claims.
.' ' ~ ~ .'' ;
' , .
. ~ .
~ ~5~ ~
- - . . . , :: ,
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a hydraulic system having fluid control means, said fluid control means having a sump in fluid communication therewith, a source of high pressure fluid, and disconnectable conduit means communicating said source with said control means, the improvement comprising:
safety connecting means for connecting said conduit between said source and said control means, said connecting means including vent means for auto-matically venting said source to the sump upon partial disengagement of said connecting means.
safety connecting means for connecting said conduit between said source and said control means, said connecting means including vent means for auto-matically venting said source to the sump upon partial disengagement of said connecting means.
2. A hydraulic system according to claim 1, in which the connecting means includes a bore defining an outlet port communicating with a passage in communication with the control means and an annular member engaged in the bore and connecting one end of the conduit means to the port to establish communication between the conduit and the passage, and in which a vent passage communicates with the bore between the ends thereof so that partial removal of the annular member from the bore brings the conduit and the bore into communication with the vent passage.
3. A hydraulic system according to claim 1 or claim 2, wherein the source of pressurized fluid includes an accumulator.
4. A hydraulic system according to claim 2, wherein the bore is internally screw-threaded along its length and has an annular shoulder at one end thereof, the annular member is externally screw-threaded and screwed (Claim 4 Continued) into the bore from the end of the bore remote from the shoulder and seal means is provided at a forward end of the annular member and is in engagement with the annular shoulder for sealing the conduit means to the passage, the conduit means and the passage being brought into communication with the vent passage as the annular member is unscrewed from the bore.
5. A hydraulic system according to claim 4, in which the vent passage communicates with the bore closely adjacent the shoulder so that the seal means is disengaged from the shoulder, and the conduit means and the passage are vented immediately unscrewing of the annular member is started.
6. The hydraulic system of claim 5 further including an annular disc-like seal and wherein said seal means includes an annular seal lip, said annular disc-like seal being retained between said shoulder and said annular seal lip.
7. The hydraulic system of claim 5 further including an annular seal having a substantially conical shaped seal face, and wherein said seal means includes a beveled annular seal face, which beveled annular seal face accommodates said conical shaped seal face, said annular seal being retained between said shoulder and said beveled annular seal face of said annular member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/720,860 US4074703A (en) | 1976-09-07 | 1976-09-07 | Accumulator drain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1043228A true CA1043228A (en) | 1978-11-28 |
Family
ID=24895551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA280,725A Expired CA1043228A (en) | 1976-09-07 | 1977-06-16 | Accumulator drain |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4074703A (en) |
| JP (1) | JPS5332277A (en) |
| CA (1) | CA1043228A (en) |
| GB (1) | GB1522946A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475522A (en) * | 1982-12-20 | 1984-10-09 | Toyota Jidosha Kabushiki Kaisha | Fuel evaporation gas treating device |
| US4610429A (en) * | 1983-04-25 | 1986-09-09 | Sajar Plastics, Inc. | Plumbing connection |
| JP2572633B2 (en) * | 1988-05-28 | 1997-01-16 | 臼井国際産業株式会社 | Joint for connecting small-diameter piping and connection method |
| US5586652A (en) * | 1993-07-12 | 1996-12-24 | Smilanick; Steve-Frank | Bicycle torque coupling |
| NL1018766C2 (en) * | 2001-08-15 | 2003-02-18 | Herman Johan Kooy | Coupling device. |
| US9394863B2 (en) * | 2013-02-27 | 2016-07-19 | Mann+Hummel Gmbh | Integrated vacuum port module |
| US10918004B2 (en) | 2018-05-14 | 2021-02-16 | Deere & Company | Hydraulic implement fluid recovery |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1580694A (en) * | 1925-03-12 | 1926-04-13 | Harvey K Russell | Pipe coupling |
| US1951460A (en) * | 1930-04-22 | 1934-03-20 | Schraders Son Inc | Valve stem |
| US1921709A (en) * | 1932-02-05 | 1933-08-08 | Weatherhead Co | Pipe coupling |
| US2205860A (en) * | 1939-09-29 | 1940-06-25 | Olds Phelps | Flashlight apparatus |
| US2631049A (en) * | 1949-03-30 | 1953-03-10 | John J Mcgillis | Pipe coupling |
| US2775471A (en) * | 1949-11-23 | 1956-12-25 | Special Screw Products Company | Tube coupling with sealed conical interface |
| US2909897A (en) * | 1958-08-29 | 1959-10-27 | Stockett James Roy | Hydraulic circuit for saw mill feed works |
| FR1373072A (en) * | 1963-07-23 | 1964-09-25 | Antar | Welding connection |
| JPS446460Y1 (en) * | 1965-12-25 | 1969-03-10 | ||
| DE1750114C3 (en) * | 1968-03-30 | 1975-01-30 | Ardie-Werk Gmbh, 8500 Nuernberg | Device for the semi or fully automatic switching of gear change transmissions for motor vehicles |
| US3521910A (en) * | 1968-11-12 | 1970-07-28 | Cajon Co | Tube coupling |
| JPS4926529B1 (en) * | 1970-08-04 | 1974-07-10 | ||
| US3877732A (en) * | 1972-09-28 | 1975-04-15 | Univ Waterloo | High pressure rotary coupling |
-
1976
- 1976-09-07 US US05/720,860 patent/US4074703A/en not_active Expired - Lifetime
-
1977
- 1977-04-13 GB GB1532377A patent/GB1522946A/en not_active Expired
- 1977-06-06 JP JP6659677A patent/JPS5332277A/en active Pending
- 1977-06-16 CA CA280,725A patent/CA1043228A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4074703A (en) | 1978-02-21 |
| JPS5332277A (en) | 1978-03-27 |
| GB1522946A (en) | 1978-08-31 |
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