US3757825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure equalizing device for fluid pressure systems
Assignee: Individual
•
Filing: 1971-07-21
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Granted: 1973-09-11
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Expires: 1991-07-21
Abstract
Abstract A shock absorbing and pressure equalizing device for hydraulic actuating systems comprises an elongated housing with threaded openings to facilitate its connection to a hydraulic line between a power source and a pair of actuators. The openings communicate with a fluid receiving chamber within the housing, one side of which is the end face of a shock absorbing, resiliently yieldable member that extends axially into but does not fill a cavity formed by one end of the housing. Shock waves of increased pressure within the first chamber produced by an imbalanced reaction from one of the system actuators are absorbed by a crushing action against the end face of the resiliently, yieldable member which can deform temporarily into the housing cavity. A graphite powder coating is provided on the yieldable member to prevent it from sticking to the inner walls of the cavity.
Inventors
- 👤 R Givens
- 👤 T Spero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:06
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T11/00; B60T11/10; B60T11/16; B60T11/18; F; F16; F16L; F16L55/00; F16L55/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86381
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
For use in a fluid pressure system including a central power source and a pair of actuators interconnected by a fluid pressure conduit, a pressure equalizing and shock-absorbing device comprising: a fluid-tight housing having a fluid receiving chamber, with ports extending through the wall of said housing into said chamber providing means for securing the ends of said conduit of said system so as to allow fluid under pressure to flow through it while leaving said chamber unobstructed within said housing; an elongated resiliently yieldable, shock-absorbing member in the form of a solid piece of molded elastomeric material of approximately 80 shores hardness and having an end portion with a face forming a sidewall of said fluid receiving chamber, means for sealing around said end portion and an axially tapered body portion with a coating of graphite powder; and an extended portion on said housing providing an enclosed fluidtight cavity for said tapered body portion of said resiliently yieldable member, said cavity being large enough to provide space surrounding said tapered body portion so that it can accommodate distortion thereof when increased fluid pressure occurs in said chamber against said face of said end portion.
Claim 2
Dependent Claim
195 words
For use in a fluid pressure system including a central power source and a pair of actuators interconnected by a fluid pressure conduit, a pressure equalizing and shock-absorbing device comprising: a fluid-tight housing having a fluid receiving chamber, with ports extending through the wall of said housing into said chamber providing means for securing the ends of said conduit of said system so as to allow fluid under pressure to flow through it while leaving said chamber unobstructed within said housing; an elongated resiliently yieldable, shock-absorbing member in the form of a solid piece of molded elastomeric material of approximately 80 shores hardness and having an end portion with a face forming a sidewall of said fluid receiving chamber, means for sealing around said end portion and an axially tapered body portion with a coating of graphite powder; and an extended portion on said housing providing an enclosed fluidtight cavity for said tapered body portion of said resiliently yieldable member, said cavity being large enough to provide space surrounding said tapered body portion so that it can accommodate distortion thereof when increased fluid pressure occurs in said chamber against said face of said end portion.
Claim 3
Dependent Claim
26 words
The pressure equalizing and shock-absorbing device as described in claim 1 wherein said face of said end portion on said resiliently yieldable member is slightly concave.
Claim 4
Dependent Claim
101 words
The pressure equalizing and shock-absorbing device as described in claim 1 wherein said fluid tight housing is comprised of a main housing member and a cup-like end cap member secured thereto, said main housing member having a cylindrical bore forming said fluid receiving chamber, said end portion of said resiliently yieldable member fitted snugly with one end of said chamber, said means for sealing said yieldable member comprising a radial collar retained by said end cap member against said main housing member, said cavity of said end cap member being cylindrical and surrounding said tapered body portion of said yieldable member.
Claim 5
Dependent Claim
64 words
The pressure equalizing and shock-absorbing device as described in claim 1 wherein said resiliently yieldable member has a cylindrical end portion attached to said sealing means which is a radially extending collar and which is also integral with said tapered body portion which has a conical shape with an axially extending knob at its small end retained by a matching recess in said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |