Patent US3784158A successfully refreshed from Google Patents.
US3784158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-flow control valves and sealing means therefor
Assignee: COPLASTIX Ltd
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Filing: 1972-05-01
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Granted: 1974-01-08
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Expires: 1992-05-01
Abstract
Abstract A valve of the type comprising a sliding closure member slidable across an opening to control flow of fluid through the opening and including a frame, a closure member slidable in the frame between an open condition and a closed condition, and a sealing member so disposed and arranged as to be compressed when the closure member is in the closed condition between adjacent surface portions of the frame and the closure member respectively to effect a seal between the frame and the closure member, the sealing member comprising a portion of resilient material bonded to one of said surface portions and a bearing portion bonded to said resilient portion and bearing on said other surface portion and having a low coefficient of friction with respect of said resilient portion and said other surface portion, said bearing portion being arranged to slide on said other surface portion as the closure member is moved between its closed and open conditions in the operation of the valve.
Inventors
- 👤 G Cave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:41
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/12; F16K3/0227
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
209 words
A penstock comprising a frame member having means defining an opening therethrough, a closure member slidably mounted on said frame member for movement between open positions permitting fluid flow through said opening along a predetermined path and a fully closed position blocking said fluid flow, means on one of said members on the downstream side of said opening defining a flat sealing face disposed in a plane at right angles to the flow path, a laminated seal element of uniform thickness on the other of said members adapted to be compressed between said members and extending continuously around said opening on the downstream side, said sealing face during opening and closing movements of said closure member slidably contacting said sealing member in said plane and providing a continuous uniform seal around said opening with said seal element uniformly compressed in a direction parallel to said path when the closure member is in fully closed position, and said seal element comprising a continuous portion of resilient material bonded to said other member and a continuous bearing portion having lower frictional properties than said resilient portion with respect to said face on the one member bonded to said resilient portion and having its outer surface in sliding engagement with said face.
Claim 2
Dependent Claim
209 words
A penstock comprising a frame member having means defining an opening therethrough, a closure member slidably mounted on said frame member for movement between open positions permitting fluid flow through said opening along a predetermined path and a fully closed position blocking said fluid flow, means on one of said members on the downstream side of said opening defining a flat sealing face disposed in a plane at right angles to the flow path, a laminated seal element of uniform thickness on the other of said members adapted to be compressed between said members and extending continuously around said opening on the downstream side, said sealing face during opening and closing movements of said closure member slidably contacting said sealing member in said plane and providing a continuous uniform seal around said opening with said seal element uniformly compressed in a direction parallel to said path when the closure member is in fully closed position, and said seal element comprising a continuous portion of resilient material bonded to said other member and a continuous bearing portion having lower frictional properties than said resilient portion with respect to said face on the one member bonded to said resilient portion and having its outer surface in sliding engagement with said face.
Claim 3
Dependent Claim
19 words
A penstock according to claim 1, wherein said resilient portion and said bearing portion are of substantially equal thickness.
Claim 4
Dependent Claim
14 words
A penstock according to claim 1, wherein the resilient portion comprises a cellular elastomer.
Claim 5
Dependent Claim
15 words
A penstock according to claim 3, wherein the resilient portion is a nitrile rubber foam.
Claim 6
Dependent Claim
13 words
A penstock according to claim 1, wherein the bearing portion is abrasion resistant.
Claim 7
Dependent Claim
12 words
A penstock according to claim 1, wherein the bearing portion is polyethylene.
Claim 8
Dependent Claim
39 words
A penstock according to claim 1, wherein the part of the bearing portion of the seal element extending along the bottom of the frame below the opening has chamfered edge portions to facilitate sliding passage of the closure member.
Claim 9
Dependent Claim
24 words
A penstock according to claim 1, wherein a lower edge portion of the closure member is tampered to facilitate sliding past said seal element.
Claim 10
Dependent Claim
34 words
A penstock as defined in claim 1, wherein said closure member is a rigid non-metallic lightweight synthetic plastic member and said bearing portion of the seal element is a non-absorbent abrasion resistant synthetic plastic.
Claim 11
Dependent Claim
18 words
A penstock according to claim 1, wherein the closure member is formed from rigid polyvinylchloride closed cell foam.
Claim 12
Dependent Claim
25 words
A penstock as defined in claim 1, wherein said sealing face is on said closure member and said seal element is on the frame member.
Claim 13
Dependent Claim
54 words
A penstock as defined in claim 1, wherein said one member has a second sealing face parallel to said first named sealing face, and said other member has mounted thereon a second sealing element similar to said first named sealing element and slidably engaged by said second sealing face and compressed between said members.
Claim 14
Dependent Claim
36 words
A penstock as defined in claim 12, wherein said sealing faces are on opposite sides of said closure member, and said seal elements are mounted on frame sections disposed on opposite sides of said closure member.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |