Patent US2903922A successfully refreshed from Google Patents.
Patent US4003398A successfully refreshed from Google Patents.
US4003398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure limiter device
Assignee: Individual
•
Filing: 1975-03-17
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Granted: 1977-01-18
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Expires: 1995-03-17
Abstract
Abstract A pressure limiting device for protecting a fluid pressure circuit involves a stack of elastomeric washers, and each of the washers has a slit through which fluid can bleed to reduce the fluid pressure below a critical value; the slits are normally closed and so prevent substantial fluid flow, but are able to open to pass fluid when the pressure reaches a critical value at which the pressure distorts the stack of washers.
Inventors
- 👤 Francois Duveau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:14
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K15/00; F16K15/14; F16K15/1401; F16K15/144; F16K15/147; F16K17/04; F16K17/0446; F16K2200/00; F16K2200/20; F16K2200/204; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7837; Y10T137/7838; Y10T137/7879; Y10T137/788; Y10T137/7881
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A fluid pressure limiting device comprising: an elastically-operable obturator, said obturator including: a plurality of valve members formed of elastomeric material and having at least one slit formed therein, said valve members being serially arranged and having opposed facing surfaces, said valve member slits defining normally closed pressure responsive valves; and a shim comprised of a material having a low coefficient of friction interposed between and in contact with the facing surfaces of each pair of adjacent elastomeric valve members, said shim having an opening formed therein, the opening in said shim defining a permanently open fluid flow passage, said shim determining the spacing between pairs of adjacent elastomeric valve members and facilitating relative sliding motion between contacting surfaces of said shim and valve members; and means for assembling said valve members and shim in a stack whereby a sliding action of facing surfaces of said valve members during pressure introduced distortion thereof may occur.
Claim 2
Dependent Claim
155 words
A fluid pressure limiting device comprising: an elastically-operable obturator, said obturator including: a plurality of valve members formed of elastomeric material and having at least one slit formed therein, said valve members being serially arranged and having opposed facing surfaces, said valve member slits defining normally closed pressure responsive valves; and a shim comprised of a material having a low coefficient of friction interposed between and in contact with the facing surfaces of each pair of adjacent elastomeric valve members, said shim having an opening formed therein, the opening in said shim defining a permanently open fluid flow passage, said shim determining the spacing between pairs of adjacent elastomeric valve members and facilitating relative sliding motion between contacting surfaces of said shim and valve members; and means for assembling said valve members and shim in a stack whereby a sliding action of facing surfaces of said valve members during pressure introduced distortion thereof may occur.
Claim 3
Dependent Claim
35 words
The pressure limiter of claim 1 wherein said valve members are in the form of flat surfaced washers and the slits in said washers of the stack are angularly oriented with respect to one another.
Claim 4
Dependent Claim
32 words
The pressure limiter of claim 2 wherein the spacer members have flat surfaces and the opening and slits in abutting spacer and valve members are angularly oriented with respect to one another.
Claim 5
Dependent Claim
15 words
The pressure limiter as in claim 3 wherein said spacer members are comprised of polytetrafluoroethylene.
Claim 6
Dependent Claim
22 words
A pressure limiter as in claim 4 wherein there are at least three elastomeric valve members respectively separated by two spacer members.
Claim 7
Dependent Claim
59 words
The pressure limiter of claim 5 wherein said assembling means includes: rigid disc means; means for assembling said disc means in spaced apart relationship; and replaceable tubular housing means positionable between said rigid discs, said tubular housing means receiving said valve and spacer members and limiting the effective areas of the valve members exposed to the applied fluid pressure.
Claim 8
Dependent Claim
18 words
The pressure limiter of claim 1 wherein the opening in said spacer member is defined by a slit.
Claim 9
Dependent Claim
24 words
The pressure limiter of claim 7 wherein the slits in adjacent spacer members in the stack are angularly oriented with respect to one another.
Claim 10
Dependent Claim
26 words
The pressure limiter of claim 8 wherein the slits in abutting spacer and valve members of the stack are angularly oriented with respect to one another.
Claim 11
Dependent Claim
59 words
The pressure limiter of claim 1 wherein said assembling means includes: rigid disc means; means for assembling said disc means in spaced apart relationship; and replaceable tubular housing means positionable between said rigid discs, said tubular housing means receiving said valve and spacer members and limiting the effective areas of the valve members exposed to the applied fluid pressure.
Claim 12
Dependent Claim
15 words
The pressure limiter as in claim 1 wherein said spacer members are comprised of polytetrafluorethylene.
Claim 13
Dependent Claim
32 words
The pressure limiter of claim 11 wherein the spacer members have flat surfaces and the opening and slits in abutting spacer and valve members are angularly oriented with respect to one another.
References Cited (Backward Citations)
US2941544A
Cited
US3007527A
Cited
US3023767A
Cited
GB966137A
Cited
US3159175A
Cited
US3151626A
Cited
US3186643A
Cited
US3303800A
Cited
US3696958A
Cited
US3811466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |