US4159298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a shaft seal
Assignee: Garlock Inc
•
Filing: 1977-02-02
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Granted: 1979-06-26
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Expires: 1997-02-02
Abstract
Abstract A method for making a shaft seal of the type including an elastomeric body and a polytetrafluoroethylene sealing element comprising inserting a metal shell (if employed in the seal), a synthetic rubber blank prep form and a polytetrafluoroethylene sealing element into a transfer or compression mold, and then closing the mold to simultaneously form a sealing lip portion of the polytetrafluoroethylene sealing element into the desired shape, mold the rubber into the desired shape and bond the rubber to the shell (if used) and to the anchor portion of the polytetrafluoroethylene sealing element.
Inventors
- 👤 Dean R. Bainard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C43/00; B29C43/02; B29C43/18; B29C45/00; B29C45/14; B29C45/14778; B29D; B29D99/00; B29D99/0053; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3634; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2621/00; B29L; B29L2031/00; B29L2031/26; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10S425/00; Y10S425/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
297 words
A method for making, by transfer molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a transfer mold including lower mold cavity section and a separate, relatively movable upper mold cavity section, said lower and upper sections defining a mold cavity therebetween, said upper mold cavity section having an upper recess for receiving a blank prep form of synthetic rubber and an opening communicating between said recess and said cavity, and a movable ram located above said upper mold cavity section for causing synthetic rubber to flow from said recess into said cavity; (b) inserting a sintered polytetrafluoroethylene member into said mold cavity; (c) inserting a synthetic rubber blank prep into said recess; and (d) closing the mold to simultaneously move both said upper mold cavity section, said ram, and said lower section toward each other, said upper section contacting said polytetrafluoroethylene member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said ram contacting said blank prep form between said ram and said upper section and flowing said blank prep form into said cavity on top of and into contact with said anchor portion of said polytetrafluoroethylene sealing element to mold said blank prep form into an annular synthetic rubber ring in contact with said anchor portion and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 2
Independent Claim
297 words
A method for making, by transfer molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a transfer mold including lower mold cavity section and a separate, relatively movable upper mold cavity section, said lower and upper sections defining a mold cavity therebetween, said upper mold cavity section having an upper recess for receiving a blank prep form of synthetic rubber and an opening communicating between said recess and said cavity, and a movable ram located above said upper mold cavity section for causing synthetic rubber to flow from said recess into said cavity; (b) inserting a sintered polytetrafluoroethylene member into said mold cavity; (c) inserting a synthetic rubber blank prep into said recess; and (d) closing the mold to simultaneously move both said upper mold cavity section, said ram, and said lower section toward each other, said upper section contacting said polytetrafluoroethylene member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said ram contacting said blank prep form between said ram and said upper section and flowing said blank prep form into said cavity on top of and into contact with said anchor portion of said polytetrafluoroethylene sealing element to mold said blank prep form into an annular synthetic rubber ring in contact with said anchor portion and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 3
Dependent Claim
51 words
The method according to claim 1 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 4
Dependent Claim
25 words
The method according to claim 1 wherein said inserting step comprises inserting said member into said mold in the shape of a flat, annular washer.
Claim 5
Dependent Claim
48 words
The method according to claim 1 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric ring to said metal case.
Claim 6
Dependent Claim
24 words
The method according to claim 1 wherein the mold closing step includes the step of cutting off any excess material from said sealing lip.
Claim 7
Dependent Claim
51 words
The method according to claim 5 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 8
Dependent Claim
25 words
The method according to claim 6 wherein said inserting step comprises inserting said member into said mold in the shape of a flat, annular washer.
Claim 9
Dependent Claim
48 words
The method according to claim 7 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric ring to said metal case.
Claim 10
Independent Claim
148 words
A method for making an annular shaft seal of the type including an annular elastomeric body and an annular, flexible, non-elastomeric sealing element having a radial anchor portion and having a frustoconical sealing lip, with said elastomeric body being bonded to said anchor portion and being spaced away from and out of contact with said sealing lip, said method comprising: (a) inserting a flexible, non-elastomeric member and a blank prep form of elastomer in a mold, (b) closing said mold, simultaneously forming said member into a sealing element having a radial anchor portion and a substantially homogeneous, die-formed, frustoconical, sealing lip and flowing said blank prep form of elastomer into an annular elastomeric body spaced away from and out of contact with said sealing lip and in contact with said anchor portion, and (c) bonding said elastomeric body to said radial anchor portion only of said sealing element.
Claim 11
Independent Claim
148 words
A method for making an annular shaft seal of the type including an annular elastomeric body and an annular, flexible, non-elastomeric sealing element having a radial anchor portion and having a frustoconical sealing lip, with said elastomeric body being bonded to said anchor portion and being spaced away from and out of contact with said sealing lip, said method comprising: (a) inserting a flexible, non-elastomeric member and a blank prep form of elastomer in a mold, (b) closing said mold, simultaneously forming said member into a sealing element having a radial anchor portion and a substantially homogeneous, die-formed, frustoconical, sealing lip and flowing said blank prep form of elastomer into an annular elastomeric body spaced away from and out of contact with said sealing lip and in contact with said anchor portion, and (c) bonding said elastomeric body to said radial anchor portion only of said sealing element.
Claim 12
Dependent Claim
25 words
The method according to claim 9 wherein said inserting step comprises inserting said member into said mold in the shape of a flat, annular washer.
Claim 13
Dependent Claim
14 words
The method according to claim 9 wherein said sealing element comprises a plastic resin.
Claim 14
Dependent Claim
13 words
The method according to claim 11 wherein said sealing element is sintered polytetrafluoroethylene.
Claim 15
Dependent Claim
25 words
The method according to claim 12 wherein said inserting step comprises inserting said member into said mold in the shape of a flat annular washer.
Claim 16
Dependent Claim
48 words
The method according to claim 13 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric body to said metal case.
Claim 17
Dependent Claim
51 words
The method according to claim 14 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 18
Dependent Claim
35 words
The method according to claim 15 wherein the mold closing step includes the step of cutting off any excess material from said flexible non-elastomeric member at the distal end of the sealing lip portion thereof.
Claim 19
Dependent Claim
51 words
The method according to claim 9 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 20
Dependent Claim
35 words
The method according to claim 9 wherein the mold closing step includes the step of cutting off any excess material from said flexible non-elastomeric member at the distal end of the sealing lip portion thereof.
Claim 21
Dependent Claim
48 words
The method according to claim 9 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric body to said metal case.
Claim 22
Dependent Claim
21 words
The method according to claim 9 wherein said inserting step includes inserting said member and prep form into a transfer mold.
Claim 23
Dependent Claim
21 words
The method according to claim 9 wherein said inserting step includes inserting said member and prep form into a compression mold.
Claim 24
Independent Claim
225 words
A method for making, by compression molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a compression mold including a lower mold cavity section and an upper mold cavity section, all defining a mold cavity therebetween, (b) inserting a sintered polytetrafluoroethylene member into said mold cavity; (c) inserting a synthetic rubber blank prep form into said cavity on top of said member, and (d) closing the mold to simultaneously move said upper mold cavity section and said lower section toward each other, said upper section contacting said member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said upper portion also contacting said blank prep form and molding it between said upper and lower sections into an annular synthetic rubber ring on top of and in contact with said anchor portion of said polytetrafluoroethylene sealing element and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 25
Independent Claim
225 words
A method for making, by compression molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a compression mold including a lower mold cavity section and an upper mold cavity section, all defining a mold cavity therebetween, (b) inserting a sintered polytetrafluoroethylene member into said mold cavity; (c) inserting a synthetic rubber blank prep form into said cavity on top of said member, and (d) closing the mold to simultaneously move said upper mold cavity section and said lower section toward each other, said upper section contacting said member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said upper portion also contacting said blank prep form and molding it between said upper and lower sections into an annular synthetic rubber ring on top of and in contact with said anchor portion of said polytetrafluoroethylene sealing element and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 26
Dependent Claim
51 words
The method according to claim 22 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 27
Dependent Claim
25 words
The method according to claim 22 wherein said inserting step comprises inserting said member into said mold in the shape of a flat, annular washer.
Claim 28
Dependent Claim
48 words
The method according to claim 22 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric ring to said metal case.
Claim 29
Dependent Claim
24 words
The method according to claim 22 wherein the mold closing step includes the step of cutting off any excess material from said sealing lip.
Claim 30
Dependent Claim
51 words
The method according to claim 26 including the steps of holding the mold closed for a time in the range of about three to four minutes at a temperature in the range of about 360° to 400° F. and at a pressure in the range of about 16,000 to 20,000 psi.
Claim 31
Dependent Claim
25 words
The method according to claim 27 wherein said inserting step comprises inserting said member into said mold in the shape of a flat, annular washer.
Claim 32
Dependent Claim
48 words
The method according to claim 28 wherein said shaft seal includes an annular metal case and including the step of inserting said annular metal case in said mold prior to closing said mold and wherein said bonding step also includes bonding said elastomeric ring to said metal case.
Claim 33
Independent Claim
290 words
A method for making, by transfer molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a transfer mold including a lower mold cavity section, a separate, relatively movable upper mold cavity section and a center ring, said lower and upper sections defining a mold cavity therebetween, said upper mold cavity section having an upper recess for receiving a blank prep form of synthetic rubber and an opening communicating between said recess and said cavity whereby synthetic rubber can flow from said recess into said cavity, (b) inserting a sintered polytetrafluoroethylene member into said mold cavity, (c) inserting a synthetic rubber blank prep form into said recess, and (d) closing the mold to simultaneously move both said upper mold cavity section, said ram, and said lower section toward each other, said upper section contacting said polytetrafluoroethylene member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said ram contacting said blank prep form between said ram and said upper section and flowing said blank prep form into said cavity on top of and into contact with said anchor portion of said polytetrafluoroethylene sealing element to mold said blank prep form into an annular synthetic rubber ring in contact with said anchor portion and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 34
Independent Claim
290 words
A method for making, by transfer molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a transfer mold including a lower mold cavity section, a separate, relatively movable upper mold cavity section and a center ring, said lower and upper sections defining a mold cavity therebetween, said upper mold cavity section having an upper recess for receiving a blank prep form of synthetic rubber and an opening communicating between said recess and said cavity whereby synthetic rubber can flow from said recess into said cavity, (b) inserting a sintered polytetrafluoroethylene member into said mold cavity, (c) inserting a synthetic rubber blank prep form into said recess, and (d) closing the mold to simultaneously move both said upper mold cavity section, said ram, and said lower section toward each other, said upper section contacting said polytetrafluoroethylene member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said ram contacting said blank prep form between said ram and said upper section and flowing said blank prep form into said cavity on top of and into contact with said anchor portion of said polytetrafluoroethylene sealing element to mold said blank prep form into an annular synthetic rubber ring in contact with said anchor portion and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 35
Independent Claim
226 words
A method for making, by compression molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a compression mold including a lower mold cavity section, an upper mold cavity section and a center ring, said lower and upper sections defining a mold cavity therebetween; (b) inserting a sintered polytetrafluoroethylene member into said mold cavity, (c) inserting a synthetic rubber blank prep form into said recess, (d) closing the mold to simultaneously move said upper mold cavity section and said lower section toward each other, said upper section contacting said member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said upper portion also contacting said blank prep form and molding it between said upper and lower sections into an annular synthetic rubber ring on top of and in contact with said anchor portion of said polytetrafluoroethylene sealing element and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
Claim 36
Independent Claim
226 words
A method for making, by compression molding, an annular shaft seal of the type including an annular ring molded from synthetic rubber and a polytetrafluoroethylene sealing element including a radial anchor portion connected to said ring and a frustoconical sealing lip spaced-away from said ring, said method comprising: (a) providing a compression mold including a lower mold cavity section, an upper mold cavity section and a center ring, said lower and upper sections defining a mold cavity therebetween; (b) inserting a sintered polytetrafluoroethylene member into said mold cavity, (c) inserting a synthetic rubber blank prep form into said recess, (d) closing the mold to simultaneously move said upper mold cavity section and said lower section toward each other, said upper section contacting said member and forming a portion of said polytetrafluoroethylene member between said upper section and said lower section into a polytetrafluoroethylene sealing element having a radial anchor portion and a substantially homogeneous, formed, frustoconical sealing lip, and said upper portion also contacting said blank prep form and molding it between said upper and lower sections into an annular synthetic rubber ring on top of and in contact with said anchor portion of said polytetrafluoroethylene sealing element and spaced away from and out of contact with said sealing lip, and (e) bonding said molded ring to said anchor portion only of said polytetrafluoroethylene sealing element.
References Cited (Backward Citations)
US2804324A
Cited
US3276115A
Cited
US3493645A
Cited
US3851037A
Cited
US3875654A
Cited
US4038359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |