US4519617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cushioning unit shaft seal arrangement
Assignee: FM ACQUISITION Corp
•
Filing: 1983-09-19
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Granted: 1985-05-28
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Expires: 2003-09-19
Abstract
Abstract An improved piston shaft seal assembly and seal arrangement therein for end-of-car hydraulic cushioning units including an improved seal retainer, an improved first oil scraper abutting the improved seal retainer, an improved reinforced oil seal abutting the improved first seal retainer and a second improved oil seal abutting the improved reinforced oil seal. Optionally, the improved piston shaft seal assembly may include an annular spacer.
Inventors
- 👤 William S. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:00
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/36; F16F9/362; F16F9/364; F16J; F16J15/00; F16J15/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A piston shaft seal assembly for an end-of-car hydraulic cushioning unit having a housing and a piston shaft extending therefrom, said piston shaft seal assembly comprising: an annular seal retainer; a first continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in one direction therealong, the first annular oil scraper seal having a portion thereof abutting a portion of the annular seal retainer; a reinforced continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in another direction therealong, the scraper lip including an annular coil spring biasing means to bias the scraper lip of the seal into sealing engagement with said piston shaft, the reinforced annular oil scraper seal having a portion thereof abutting a portion of the first annular oil scraper seal; and a second continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly said piston shaft and extending in said another direction therealong.
Claim 2
Dependent Claim
169 words
A piston shaft seal assembly for an end-of-car hydraulic cushioning unit having a housing and a piston shaft extending therefrom, said piston shaft seal assembly comprising: an annular seal retainer; a first continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in one direction therealong, the first annular oil scraper seal having a portion thereof abutting a portion of the annular seal retainer; a reinforced continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in another direction therealong, the scraper lip including an annular coil spring biasing means to bias the scraper lip of the seal into sealing engagement with said piston shaft, the reinforced annular oil scraper seal having a portion thereof abutting a portion of the first annular oil scraper seal; and a second continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly said piston shaft and extending in said another direction therealong.
Claim 3
Dependent Claim
43 words
The piston shaft seal assembly of claim 1 wherein said piston shaft seal assembly further comprising: an annular spacer having a portion thereof abutting a portion of the reinforced annular oil scraper seal and a portion of the second annular oil scraper seal.
Claim 4
Dependent Claim
36 words
The piston shaft seal assembly of claim 2 wherein the annular seal retainer includes a plurality of apertures therein and an annular recess in which a portion of the first annular oil scraper seal is retained.
Claim 5
Dependent Claim
27 words
The piston shaft seal assembly of claim 3 wherein the first annular oil scraper seal and the second annular oil scraper seal are of substantially identical construction.
Claim 6
Dependent Claim
40 words
The piston shaft seal assembly of claim 4 further comprising: a plurality of threaded fasteners extending through the plurality of apertures in the seal retainer being secured to said housing to retain said piston shaft seal assembly to said housing.
Claim 7
Dependent Claim
19 words
The piston shaft seal assembly of claim 1 wherein the annular seal retainer includes a plurality of apertures therein.
Claim 8
Dependent Claim
27 words
The piston shaft seal assembly of claim 6 wherein the first annular oil scraper seal and the second annular oil scraper seal are of substantially identical construction.
Claim 9
Dependent Claim
40 words
The piston shaft seal assembly of claim 7 further comprising: a plurality of threaded fasteners extending through the plurality of apertures in the seal retainer being secured to said housing to retain said piston shaft seal assembly to said housing.
Claim 10
Dependent Claim
198 words
A piston shaft seal assembly for an end-of-car hydraulic cushioning unit having a housing and a piston shaft extending therefrom, said piston shaft seal assembly comprising: an annular seal retainer having a plurality of apertures therein; a first continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in one direction therealong, the first annular oil scraper seal having a portion thereof abutting a portion of the annular recess in the annular seal retainer; a reinforced continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in another direction therealong, the scraper lip including an annular coil spring biasing means to bias the scraper lip of the seal into sealing engagement with said piston shaft, the reinforced annular oil scraper seal having a portion thereof abutting a portion of the first annular oil scraper seal; and a second continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in said another direction therealong, the second annular oil scraper seal being of substantially identical construction to the first annular oil scraper seal.
Claim 11
Dependent Claim
198 words
A piston shaft seal assembly for an end-of-car hydraulic cushioning unit having a housing and a piston shaft extending therefrom, said piston shaft seal assembly comprising: an annular seal retainer having a plurality of apertures therein; a first continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in one direction therealong, the first annular oil scraper seal having a portion thereof abutting a portion of the annular recess in the annular seal retainer; a reinforced continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in another direction therealong, the scraper lip including an annular coil spring biasing means to bias the scraper lip of the seal into sealing engagement with said piston shaft, the reinforced annular oil scraper seal having a portion thereof abutting a portion of the first annular oil scraper seal; and a second continuous substantially elastomeric annular oil scraper seal having a scraper lip thereon sealingly engaging said piston shaft and extending in said another direction therealong, the second annular oil scraper seal being of substantially identical construction to the first annular oil scraper seal.
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |