US3678809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vented piston bearing for hydraulic piston and cylinder assemblies
Assignee: SCHRADER BELLOWS Inc A CORP OF DE
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Filing: 1970-02-16
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Granted: 1972-07-25
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Expires: 1990-02-16
Abstract
Abstract A vented piston bearing for hydraulic piston and cylinder assemblies wherein the piston bearings comprise annular members carried on the pistons and engageable with the cylinder wall. The piston bearing is provided with a plurality of transverse openings therein extending to the areas in which the piston seals are located and the piston bearing is provided with a plurality of radially positioned vent passageways communicating with the transverse openings. Hydraulic fluid passing the piston seals is thereby vented through the piston bearing rather than extruding the piston seals from their normal locations.
Inventors
- 👤 Kingsley A Doutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232; F16J15/3236; F04; F04B; F04B53/00; F04B53/14; F04B53/143; F16J1/00; F16J1/02; F16J15/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A resilient piston bearing for a hydraulic piston and cylinder assembly including a cylinder, a piston, at least one piston seal seat and at least one resilient annular piston seal freely seated thereon, said piston bearing positioned on said piston abutting said piston seal with the periphery of said seal being slidably engaging said cylinder, vent passageways in said piston bearing communicating with the periphery of said piston bearing and the inner side portion thereof adjacent the seat of said piston seal, whereby fluid passing between said seal and seat is vented to the periphery of said piston bearing.
Claim 2
Dependent Claim
99 words
A resilient piston bearing for a hydraulic piston and cylinder assembly including a cylinder, a piston, at least one piston seal seat and at least one resilient annular piston seal freely seated thereon, said piston bearing positioned on said piston abutting said piston seal with the periphery of said seal being slidably engaging said cylinder, vent passageways in said piston bearing communicating with the periphery of said piston bearing and the inner side portion thereof adjacent the seat of said piston seal, whereby fluid passing between said seal and seat is vented to the periphery of said piston bearing.
Claim 3
Dependent Claim
36 words
The piston bearing for hydraulic piston and cylinder assemblies set forth in claim 1 and wherein an annular groove is formed in the periphery of the piston bearing and some of the vent passageways communicate therewith.
Claim 4
Dependent Claim
37 words
The piston bearing set forth in claim 1 and wherein the vent passageways comprise shallow grooves in at least one side of the piston bearing arranged in radial pattern and spaced circumferentially with respect to one another.
Claim 5
Dependent Claim
51 words
The piston bearing set forth in claim 1 and wherein the vent passageways comprise several radially extending circumferentially spaced passageways formed in the piston bearing and several transversely extending circumferentially spaced passageways formed in the piston bearing and communicating with said radially extending passageways and the sides of said piston bearing.
Claim 6
Dependent Claim
36 words
The piston bearing set forth in claim 1 and wherein an annular shallow groove is formed in the peripheral surface of said piston bearing inwardly of the sides thereof and in communication with said vent passageways.
Claim 7
Dependent Claim
31 words
The piston bearing set forth in claim 4 and wherein an annular shallow groove is formed in the peripheral surface of said piston bearing and said radially extending passageways communicate therewith.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |