CA1052835A - Bonded tfe seal with dual lip - Google Patents
Bonded tfe seal with dual lipInfo
- Publication number
- CA1052835A CA1052835A CA240,113A CA240113A CA1052835A CA 1052835 A CA1052835 A CA 1052835A CA 240113 A CA240113 A CA 240113A CA 1052835 A CA1052835 A CA 1052835A
- Authority
- CA
- Canada
- Prior art keywords
- sealing element
- metal case
- radial
- lip
- annular
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
Abstract
ABSTRACT OF THE DISCLOSURE
A shaft seal of the type including a metal case and a polytetrafluoroethylene sealing element, is provided with an auxiliary sealing lip by providing a radial flange of the metal case with a plurality of circumferentially spaced-apart apertures therethrough and molding an annular filler ring of synthetic rubber in the space between the sealing element and the metal case such that the rubber also flows through the apertures to the other side of the radial flange of the metal case and forms an auxiliary lip there. The filler ring chemically bonds to the metal case and mechanically bonds to the sealing element to lock the sealing element in place while also forming an auxiliary lip.
A shaft seal of the type including a metal case and a polytetrafluoroethylene sealing element, is provided with an auxiliary sealing lip by providing a radial flange of the metal case with a plurality of circumferentially spaced-apart apertures therethrough and molding an annular filler ring of synthetic rubber in the space between the sealing element and the metal case such that the rubber also flows through the apertures to the other side of the radial flange of the metal case and forms an auxiliary lip there. The filler ring chemically bonds to the metal case and mechanically bonds to the sealing element to lock the sealing element in place while also forming an auxiliary lip.
Description
' ~ Qs~s3~
BONDED TFE SEAL WITH DUAL L~P
BACKGROUND OF THE I~N~ION
This in~ention relates to shaft seals, also ~no~rn as oil seals, de~i~ned for se~ling againât fluid le~l~a~e alon~
snarts and more particularly to shaft seals o~ the type emoloy-ing a metal case and a polytetra~luoroe ..hylene sealing element and requir~ng an auxil~ary sealing lip.
It is an ob~ect o~ the present invention to provide a shaf~ seal (and a ~.ethod for makin~ the seal) 10 o~ the type employing 2 metal c2se and a polyte~rafluoro-ethylene sealing elemen~ wi~h a ~.olded auxiliary li~ for keeping out dus t and conta~r~tes. The method is economica~
in that it provides the auxiliary llp ~lith very little or -n~ 2dditional expense.
`SUMMAP~Y OF THE PRESENT I~E~ION
This invention pertains to a method for making a shaft seal of the type which includes a single annular metal case which has a radial flange and a cylindrical portion and an annular polytetrafluoroethylene sealing element in-cluding a radial portion and a sealing lip. The methodcomprises the steps of connecting the sealing element to the case by placing the radial portion of the sealing element against the inside surface of the radial flange of the case and molding an annular synthetic rubber filler ring in the annular space between the radial portion of the .
~5 sealing element and the cylindrical portion of the metal case.
The filler ring is a solid body substantially filling the annular space and is spaced away from and out of contact with the sealing lip and bonding the filler ring to both the radial portion of the sealing element and to the cylindrical portion of the case. The method also comprises the step of molding an auxiliary lip from the synthetic rubber simulta-neously with the filler ring molding step, the auxiliary lip being located on the opposite side of the radial flange from the sealing lip.
Another aspect of the invention in a broad sense pertains to a shaft seal which comprises a single annular metal case having a radial flange and a cylindrical portion;
an annular polytetrafluoroethylene sealing element which includes a radial portion and a sealing lip, the radial portion being in contact with an inside surface of the radial flange of said case; a molded, annular, synthetic rubber filler ring bonded to both said cylindrical portion of said metal case and the inside surface of said radial portion of said sealing element, the ring being located in the annular space between the radial portion of said sealing element and the cylindrical portion of said metal case and being a solid body substantially filling said annular space and being spaced away from and out of contact with said sealing lip; and an annular auxiliary lip molded from said synthetic rubber, bonded to said metal case and located on the opposite side of said radial flange from said sealing element.
A shaft seal of the type having a metal case with a radial flange and a cylindrical portion and a polytetrafluoro-ethylene sealing element is provided with an auxiliary lip byproviding a plurality of circumferentially spaced-apart apertures 1~52~
through a radial flange of the metal case, positioning the sealing element adjacent the inside surface of the radial flange of the metal case (the inside surface being that surface on the same side of the radial flange as is the cylindrical portion) but spaced radially inwardly from the apertures, and molding an annular filler ring of synthetic rubber between the sealing element and the cylindrical portion of the metal case such that it bonds to the metal case, and to the sealing element, and flows through the apertures to the outside of the radial flange to form an auxiliary lip that also bonds to the radial flange.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be more fully understood by reference to the following detailed description thereof, when read in conjunction with the attached drawing, wherein The Fig. is a cross-sectional view through one half of a shaft seal made according to a preferred embodiment of the present invention.
-2a-lOS~835 DETAILED D~.SCRIPTION O~ THE PRRF~,RR~,D ElVEBODl~lENT
With reference now to the drawing, the Fig. sho~rs a shaft seal 10, includlng an annular metal case 12, a poly-tetrafluoroethylene sealing element 14, a molded-in annular ~iller ring 16 of synthetic rubber and an auxiliary lip 18 also molded from the synthetic rubber. The metal case 12 includes a cylindrical portion 20, a radial flange 22 and a plurality of circumferentially spaced apart apertures 24 ln the radial flange 22 The sealing element 14 has an O.D.
26 positloned radially inwardly from the apertures 24 and includes a radial portion 28 and a frusto conical portion 30 having a sealing lip 32 and a plurality o~ hydrodynamic pumping elements 34 on a shaft engaging surface 36 thereof.
The pumping elements 34 are not essential, but can be molded into the sealing element 14 at the same time that the filler ring 16 is molded in place, if desired.
The shaft seal 10 is made by positioning the metal case 12 in a mold with the sealing element 14 in place against the radial flange 22~ and placing a blank prep ~orm o~ synthetic rubber between the sealing element 14 and the cylindrical portion 20 o~
the metal case 12. When the mold is closed, the annular filler ring 16 is formed in position as shown and a portion of the synthetic rubber flows through the apertures 24 to the side o~ the radial flange 22 opposite the sealing element 14 to form the molded auxiliary lip 18. The synthetic rubber chem-ically bonds to the metal of the case 12 and mechanically bonds ~o the polytetrafluoroethylene sealing element 14. The manner ~05'~835 in which a mechanical bond i3 formed between a rubber element such as the filler ring 16, and a polytetrafluoroethylene elernent such as the sealing el~ment 14, and a chemical bond is formed between a rubber element and a metal element, such as the metal case 12, are well-known to those skilled in the art and in ~nd of itself forms no part of the present invention and there-fore need not be described in detail herein. It will suf~ice, therefore, to simply state that the sealing element 14 is etched, by acid for example, to provide a large number of small pits ~or the rubber of the filler ring 16 to flow into, to provide the mechanical bonding, as is well-known in the art.
The metal case 12 is phosphated and cemented (using, for ex-ample, a methyl ethyl ketone base adhesive), prior to insertion into the mold, to provide the chemical bond, as is also well-known in the art. The mold usually is closed for about 3-4 minutes J and a temperature of about 360-400 F. and a pressure of about 16,000-20,000 psi is used.
While the present invention has been described in detail with respect to the preferred embodiments thereof it is noted that various modifications and changes can be made therein as will be evident to one skilled in the art. For example, the outside diameter of the sealing element may extend all the way to the cylindrical portion of the metal case 12, however, in such case t'ne sealing elemént 14 would be provlded with a plurality of circumferentially spaced-apart openings to register with the apertures 24 so that the synthetic rubber can flow through to the opposite side of the radial flange.
BONDED TFE SEAL WITH DUAL L~P
BACKGROUND OF THE I~N~ION
This in~ention relates to shaft seals, also ~no~rn as oil seals, de~i~ned for se~ling againât fluid le~l~a~e alon~
snarts and more particularly to shaft seals o~ the type emoloy-ing a metal case and a polytetra~luoroe ..hylene sealing element and requir~ng an auxil~ary sealing lip.
It is an ob~ect o~ the present invention to provide a shaf~ seal (and a ~.ethod for makin~ the seal) 10 o~ the type employing 2 metal c2se and a polyte~rafluoro-ethylene sealing elemen~ wi~h a ~.olded auxiliary li~ for keeping out dus t and conta~r~tes. The method is economica~
in that it provides the auxiliary llp ~lith very little or -n~ 2dditional expense.
`SUMMAP~Y OF THE PRESENT I~E~ION
This invention pertains to a method for making a shaft seal of the type which includes a single annular metal case which has a radial flange and a cylindrical portion and an annular polytetrafluoroethylene sealing element in-cluding a radial portion and a sealing lip. The methodcomprises the steps of connecting the sealing element to the case by placing the radial portion of the sealing element against the inside surface of the radial flange of the case and molding an annular synthetic rubber filler ring in the annular space between the radial portion of the .
~5 sealing element and the cylindrical portion of the metal case.
The filler ring is a solid body substantially filling the annular space and is spaced away from and out of contact with the sealing lip and bonding the filler ring to both the radial portion of the sealing element and to the cylindrical portion of the case. The method also comprises the step of molding an auxiliary lip from the synthetic rubber simulta-neously with the filler ring molding step, the auxiliary lip being located on the opposite side of the radial flange from the sealing lip.
Another aspect of the invention in a broad sense pertains to a shaft seal which comprises a single annular metal case having a radial flange and a cylindrical portion;
an annular polytetrafluoroethylene sealing element which includes a radial portion and a sealing lip, the radial portion being in contact with an inside surface of the radial flange of said case; a molded, annular, synthetic rubber filler ring bonded to both said cylindrical portion of said metal case and the inside surface of said radial portion of said sealing element, the ring being located in the annular space between the radial portion of said sealing element and the cylindrical portion of said metal case and being a solid body substantially filling said annular space and being spaced away from and out of contact with said sealing lip; and an annular auxiliary lip molded from said synthetic rubber, bonded to said metal case and located on the opposite side of said radial flange from said sealing element.
A shaft seal of the type having a metal case with a radial flange and a cylindrical portion and a polytetrafluoro-ethylene sealing element is provided with an auxiliary lip byproviding a plurality of circumferentially spaced-apart apertures 1~52~
through a radial flange of the metal case, positioning the sealing element adjacent the inside surface of the radial flange of the metal case (the inside surface being that surface on the same side of the radial flange as is the cylindrical portion) but spaced radially inwardly from the apertures, and molding an annular filler ring of synthetic rubber between the sealing element and the cylindrical portion of the metal case such that it bonds to the metal case, and to the sealing element, and flows through the apertures to the outside of the radial flange to form an auxiliary lip that also bonds to the radial flange.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be more fully understood by reference to the following detailed description thereof, when read in conjunction with the attached drawing, wherein The Fig. is a cross-sectional view through one half of a shaft seal made according to a preferred embodiment of the present invention.
-2a-lOS~835 DETAILED D~.SCRIPTION O~ THE PRRF~,RR~,D ElVEBODl~lENT
With reference now to the drawing, the Fig. sho~rs a shaft seal 10, includlng an annular metal case 12, a poly-tetrafluoroethylene sealing element 14, a molded-in annular ~iller ring 16 of synthetic rubber and an auxiliary lip 18 also molded from the synthetic rubber. The metal case 12 includes a cylindrical portion 20, a radial flange 22 and a plurality of circumferentially spaced apart apertures 24 ln the radial flange 22 The sealing element 14 has an O.D.
26 positloned radially inwardly from the apertures 24 and includes a radial portion 28 and a frusto conical portion 30 having a sealing lip 32 and a plurality o~ hydrodynamic pumping elements 34 on a shaft engaging surface 36 thereof.
The pumping elements 34 are not essential, but can be molded into the sealing element 14 at the same time that the filler ring 16 is molded in place, if desired.
The shaft seal 10 is made by positioning the metal case 12 in a mold with the sealing element 14 in place against the radial flange 22~ and placing a blank prep ~orm o~ synthetic rubber between the sealing element 14 and the cylindrical portion 20 o~
the metal case 12. When the mold is closed, the annular filler ring 16 is formed in position as shown and a portion of the synthetic rubber flows through the apertures 24 to the side o~ the radial flange 22 opposite the sealing element 14 to form the molded auxiliary lip 18. The synthetic rubber chem-ically bonds to the metal of the case 12 and mechanically bonds ~o the polytetrafluoroethylene sealing element 14. The manner ~05'~835 in which a mechanical bond i3 formed between a rubber element such as the filler ring 16, and a polytetrafluoroethylene elernent such as the sealing el~ment 14, and a chemical bond is formed between a rubber element and a metal element, such as the metal case 12, are well-known to those skilled in the art and in ~nd of itself forms no part of the present invention and there-fore need not be described in detail herein. It will suf~ice, therefore, to simply state that the sealing element 14 is etched, by acid for example, to provide a large number of small pits ~or the rubber of the filler ring 16 to flow into, to provide the mechanical bonding, as is well-known in the art.
The metal case 12 is phosphated and cemented (using, for ex-ample, a methyl ethyl ketone base adhesive), prior to insertion into the mold, to provide the chemical bond, as is also well-known in the art. The mold usually is closed for about 3-4 minutes J and a temperature of about 360-400 F. and a pressure of about 16,000-20,000 psi is used.
While the present invention has been described in detail with respect to the preferred embodiments thereof it is noted that various modifications and changes can be made therein as will be evident to one skilled in the art. For example, the outside diameter of the sealing element may extend all the way to the cylindrical portion of the metal case 12, however, in such case t'ne sealing elemént 14 would be provlded with a plurality of circumferentially spaced-apart openings to register with the apertures 24 so that the synthetic rubber can flow through to the opposite side of the radial flange.
Claims (14)
1. A method for making a shaft seal of the type including a single annular metal case having a radial flange and a cylindrical portion, and an annular polytetrafluoroethylene sealing element including a radial portion and a sealing lip, said method comprising the steps of:
(a) connecting said sealing element to said case by placing said radial portion of said sealing element against the inside surface of said radial flange of said case and molding an annular synthetic rubber filler ring in the annular space between said radial portion of said sealing element and said cylindrical portion of said metal case, said filler ring being a solid body sub-stantially filling said annular space and being spaced away from and out of contact with said sealing lip, and bonding said filler ring to both said radial portion of said sealing element and to said cylindrical portion of said case; and (b) molding an auxiliary lip from said synthetic rubber simultaneously with said filler ring molding step, said auxiliary lip being located on the opposite side of said radial flange from said sealing lip.
(a) connecting said sealing element to said case by placing said radial portion of said sealing element against the inside surface of said radial flange of said case and molding an annular synthetic rubber filler ring in the annular space between said radial portion of said sealing element and said cylindrical portion of said metal case, said filler ring being a solid body sub-stantially filling said annular space and being spaced away from and out of contact with said sealing lip, and bonding said filler ring to both said radial portion of said sealing element and to said cylindrical portion of said case; and (b) molding an auxiliary lip from said synthetic rubber simultaneously with said filler ring molding step, said auxiliary lip being located on the opposite side of said radial flange from said sealing lip.
2. The method according to claim 1 wherein said molding steps comprise positioning said metal case and said sealing element in a mold positioning a synthetic rubber blank prep form in said mold, providing a plurality of spaced-apart apertures in said radial flange of said metal case, and closing said mold to form said filler ring.
3. The method according to claim 2 wherein said rubber blank prep form positioning step comprises positioning said prep form in an annular space between said cylindrical portion of said metal case and said radial portion of said sealing element.
4. The method according to claim 3 including positioning said radial portion of said sealing element in said mold such that it does not block said apertures.
5. The method according to claim 4 including positioning the O.D. of said radial portion of said sealing element radially inwardly from said apertures.
6. The method of claim 4 including coating said metal case, prior to said bonding step, with a suitable chemical bonding agent.
7. The method of claim 4 including etching said sealing element before bonding to improve the bond between said sealing element and said filler ring.
8. The method of claim 7 including coating said metal case, prior to said bonding step, with a suitable chemical bonding agent.
9. The method according to claim 8 including the step of molding hydrodynamic pumping elements on a shaft engaging surface of said sealing element during said molding steps.
10. A shaft seal comprising:
(a) a single annular metal case having a radial flange and a cylindrical portion;
(b) an annular polytetrafluoroethylene sealing element including a radial portion and a sealing lip, said radial portion being in contact with an inside surface of said radial flange of said case;
(c) a molded, annular, synthetic rubber filler ring bonded to both said cylindrical portion of said metal case and the inside surface of said radial portion of said sealing element, said ring being located in the annular space between said radial portion of said sealing element and said cylindrical portion of said metal case and being a solid body substantially filling said annular space and being spaced away from and out of contact with said sealing lip; and (d) an annular auxiliary lip molded from said synthetic rubber, bonded to said metal case and located on the opposite side of said radial flange from said sealing element.
(a) a single annular metal case having a radial flange and a cylindrical portion;
(b) an annular polytetrafluoroethylene sealing element including a radial portion and a sealing lip, said radial portion being in contact with an inside surface of said radial flange of said case;
(c) a molded, annular, synthetic rubber filler ring bonded to both said cylindrical portion of said metal case and the inside surface of said radial portion of said sealing element, said ring being located in the annular space between said radial portion of said sealing element and said cylindrical portion of said metal case and being a solid body substantially filling said annular space and being spaced away from and out of contact with said sealing lip; and (d) an annular auxiliary lip molded from said synthetic rubber, bonded to said metal case and located on the opposite side of said radial flange from said sealing element.
11. The shaft seal according to claim 10 including a plurality of circumferentially spaced-apart apertures extending through said radial flange.
12. The shaft seal according to claim 11 wherein said radial portion of said sealing element has an O.D. positioned radially inwardly from said apertures.
13. The shaft seal according to claim 12 wherein said cylindrical portion extends axially inwardly from adjacent the radially outer end of said radial flange, said sealing lip extends both axially and radially inwardly, and said auxiliary lip extends axially outwardly and radially inwardly.
14. The shaft seal according to claim 13 wherein said auxiliary lip includes a radial portion extending radially outwardly beyond said plurality of apertures and including a quantity of synthetic rubber connecting said radial portion of said auxiliary lip to said filler ring through said plurality of apertures.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/544,303 US4038359A (en) | 1975-01-27 | 1975-01-27 | Method of making a shaft seal with dual lip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1052835A true CA1052835A (en) | 1979-04-17 |
Family
ID=24171644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA240,113A Expired CA1052835A (en) | 1975-01-27 | 1975-11-20 | Bonded tfe seal with dual lip |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US4038359A (en) |
| JP (1) | JPS5198461A (en) |
| CA (1) | CA1052835A (en) |
| DE (1) | DE2554137A1 (en) |
| ES (2) | ES444641A1 (en) |
| FR (1) | FR2298746A1 (en) |
| GB (1) | GB1520930A (en) |
| IT (1) | IT1052791B (en) |
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| US7854433B2 (en) * | 2005-02-24 | 2010-12-21 | Freudenberg-Nok General Partnership | Dynamic seal |
| US7909333B2 (en) * | 2007-01-12 | 2011-03-22 | Federal-Mogul Worldwide, Inc. | Unitized seal assembly having soft retention and debris expulsion features |
| DE102013206579B4 (en) * | 2013-04-12 | 2017-08-03 | Aktiebolaget Skf | Sealing arrangement with a radial shaft seal and an additional sealing element and sealing element for this seal arrangement |
| US9759330B2 (en) | 2014-02-04 | 2017-09-12 | Freudenberg-Nok General Partnership | Energy saving seal with rocking dust lip |
| US9695937B2 (en) | 2014-02-04 | 2017-07-04 | Freudenberg-Nok General Partnership | Energy saving seal with vacuum induced counter-balance and rocking feature |
| US9714710B2 (en) | 2014-02-04 | 2017-07-25 | Freudenberg-Nok General Partnership | Energy saving self-contact seal with pushing bead |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2437901A (en) * | 1944-12-23 | 1948-03-16 | Gen Tire & Rubber Co | Sealing ring |
| US2476324A (en) * | 1945-06-14 | 1949-07-19 | George F P Reich | Sealing assembly |
| US2717793A (en) * | 1952-11-10 | 1955-09-13 | Mathewson Corp | Fluid seal and apparatus for manufacture thereof |
| US2804324A (en) * | 1953-09-11 | 1957-08-27 | Gen Motors Corp | Seal |
| US2804325A (en) * | 1954-07-16 | 1957-08-27 | Gen Motors Corp | Fluid seal |
| US2955481A (en) * | 1957-03-22 | 1960-10-11 | Lemforder Metallwaren G M B H | Elastic gear- and sprocket wheels |
| US3099454A (en) * | 1961-05-05 | 1963-07-30 | Victor Mfg & Gasket Co | Fluid seal |
| US3241845A (en) * | 1961-09-14 | 1966-03-22 | Chicago Rawhide Mfg Co | Bonded seals |
| US3194570A (en) * | 1962-01-29 | 1965-07-13 | Federal Mogul Bower Bearings | Multiple-lip seal |
| US3549445A (en) * | 1964-10-23 | 1970-12-22 | Johns Manville | Method of forming a laminate sealing element |
| US3306622A (en) * | 1965-01-26 | 1967-02-28 | Illinois Milling Inc | Reinforced bearing seal |
| US3462333A (en) * | 1965-02-25 | 1969-08-19 | Ramsey Corp | Method of making seal |
| GB1144772A (en) * | 1965-03-18 | 1969-03-12 | Angus George Co Ltd | Improvements in or relating to shaft seals |
| SE333279B (en) * | 1969-06-30 | 1971-03-08 | Skf Svenska Kullagerfab Ab | SUPPORT AND SEALING FOR ROLLING STOCK |
| IT1016411B (en) * | 1973-08-03 | 1977-05-30 | Freudenberg C | IMPROVEMENTS IN SEALING GASKETS IN PARTICULAR FOR ROTATING SHAFTS |
| US3929341A (en) * | 1973-12-19 | 1975-12-30 | Federal Mogul Corp | Method of making polytetrafluoroethylene sealing elements with hydrodynamic action |
-
1975
- 1975-01-27 US US05/544,303 patent/US4038359A/en not_active Expired - Lifetime
- 1975-11-20 CA CA240,113A patent/CA1052835A/en not_active Expired
- 1975-12-02 DE DE19752554137 patent/DE2554137A1/en active Pending
- 1975-12-10 IT IT52615/75A patent/IT1052791B/en active
- 1975-12-19 FR FR7539169A patent/FR2298746A1/en not_active Withdrawn
- 1975-12-23 GB GB52693/75A patent/GB1520930A/en not_active Expired
-
1976
- 1976-01-27 JP JP51007238A patent/JPS5198461A/ja active Pending
- 1976-01-27 ES ES444641A patent/ES444641A1/en not_active Expired
- 1976-01-27 ES ES1976218352U patent/ES218352Y/en not_active Expired
-
1977
- 1977-03-18 US US05/779,270 patent/US4126320A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IT1052791B (en) | 1981-07-20 |
| ES218352U (en) | 1976-09-01 |
| JPS5198461A (en) | 1976-08-30 |
| ES444641A1 (en) | 1977-05-16 |
| DE2554137A1 (en) | 1976-07-29 |
| FR2298746A1 (en) | 1976-08-20 |
| GB1520930A (en) | 1978-08-09 |
| US4126320A (en) | 1978-11-21 |
| US4038359A (en) | 1977-07-26 |
| ES218352Y (en) | 1977-01-16 |
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