US4345768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self pumping seal for a reciprocating member
Assignee: Caterpillar Inc
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Filing: 1979-10-29
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Granted: 1982-08-24
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Expires: 1999-10-29
Abstract
Abstract A self pumping seal for a reciprocating member (12) provides cooling fluid to the reciprocating member (12) with degradation of an elastomeric seal (34) lessened by separating the elastomeric seal (34) from the higher temperatures of the machinery. Separation is provided by a relatively heat insensitive rigid seal (24).
Inventors
- 👤 Michael A. Roussin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:26
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/12; B25D17/00; B25D17/06; F; F01; F01B; F01B11/00; F01B11/04; F04; F04B; F04B43/00; F04B43/02; Y; Y10; Y10S; Y10S277/00; Y10S277/904; Y10S277/93; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
In a seal arrangement for a device having a housing (20), and a reciprocating member (12) mounted in said housing (20), the improvement comprising: first seal means (24) for sealingly associating the reciprocating member (12) with said housing (20); second seal means (33) for sealingly associating the reciprocating member (12) with said housing (20) and forming a substantially fluid tight variable volume cavity (46) with said first seal means (24); a source of cooling fluid (40); means (42,52,44), for communicating said source of cooling fluid (40) to said variable volume cavity (46).
Claim 2
Dependent Claim
92 words
In a seal arrangement for a device having a housing (20), and a reciprocating member (12) mounted in said housing (20), the improvement comprising: first seal means (24) for sealingly associating the reciprocating member (12) with said housing (20); second seal means (33) for sealingly associating the reciprocating member (12) with said housing (20) and forming a substantially fluid tight variable volume cavity (46) with said first seal means (24); a source of cooling fluid (40); means (42,52,44), for communicating said source of cooling fluid (40) to said variable volume cavity (46).
Claim 3
Dependent Claim
22 words
The seal arrangement of claim 1 further comprising separate means (48,50,54) for communicating fluid from the variable volume cavity to said source.
Claim 4
Dependent Claim
27 words
The seal arrangement of claim 1 wherein the first seal means (24) comprises a relatively low friction portion (32) in sliding engagement with the reciprocating member (12).
Claim 5
Dependent Claim
22 words
The seal arrangement of claim 3 wherein the relatively low friction portion (32) is comprised of a material relatively insensitive to heat.
Claim 6
Dependent Claim
20 words
The seal arrangement of claim 3 wherein the relatively low friction (32) portion is comprised of a relatively inert material.
Claim 7
Dependent Claim
27 words
The seal arrangement of claim 1 or claim 3 wherein the second seal means (33) is comprised of a synthetic elastomeric member affixed to the reciprocating member.
Claim 8
Dependent Claim
39 words
The seal arrangement of claim 1 wherein the means (42,52,44) for connecting the source of cooling fluid to the variable volume cavity (46) comprises a conduit (42) and a check valve (52), said check valve disposed in said conduit.
Claim 9
Dependent Claim
29 words
The seal assembly of claim 1 wherein the second seal means (33) comprises an elastomeric member (34) affixed both to the housing (22) and to the reciprocating member (12).
Claim 10
Dependent Claim
40 words
The seal assembly of claim 8 wherein the first seal means (24) comprises a first substantially rigid portion (26) affixed to the housing (20) and a second relatively low friction portion (32) in sliding engagement with the reciprocating member (12).
Claim 11
Dependent Claim
20 words
The seal assembly of claim 4 or claim 9 wherein the relatively low friction portion (32) is comprised of polytetrafluoroethylene.
Claim 12
Dependent Claim
25 words
The seal assembly of claim 4 or claim 9 wherein the relatively low friction portion 32 is comprised of a mixture of polytetrafluoroethylene and nylon.
Claim 13
Dependent Claim
128 words
A self pumping seal for a reciprocating assembly, the reciprocating assembly including a housing (20) and a reciprocating member (12) mounted in said housing (20), comprising: relatively rigid seal means (24) for sealingly associating the reciprocating member (12) with said housing (20); flexible seal means (33) for sealingly associating the reciprocating member (12) with said housing (20) distal of said relatively rigid seal means (24), said flexible seal means (33) and said relatively rigid seal means (24) forming a substantially fluid tight variable volume cavity (46); a source of cooling fluid (40); means (42,52,44) for communicating said source of cooling fluid to said variable volume cavity (46); and separate means (48,54,50) for communicating cooling fluid from said variable volume cavity (46) to said source of cooling fluid (40).
Claim 14
Dependent Claim
128 words
A self pumping seal for a reciprocating assembly, the reciprocating assembly including a housing (20) and a reciprocating member (12) mounted in said housing (20), comprising: relatively rigid seal means (24) for sealingly associating the reciprocating member (12) with said housing (20); flexible seal means (33) for sealingly associating the reciprocating member (12) with said housing (20) distal of said relatively rigid seal means (24), said flexible seal means (33) and said relatively rigid seal means (24) forming a substantially fluid tight variable volume cavity (46); a source of cooling fluid (40); means (42,52,44) for communicating said source of cooling fluid to said variable volume cavity (46); and separate means (48,54,50) for communicating cooling fluid from said variable volume cavity (46) to said source of cooling fluid (40).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |