Patent US3880054A successfully refreshed from Google Patents.
US3880054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve actuator
Assignee: TDK Micronas GmbH
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Filing: 1973-06-27
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Granted: 1975-04-29
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Expires: 1993-06-27
Abstract
Abstract A valve actuator which employs a hydraulic cylinder for moving the valve element of a valve assembly. The piston and piston rod in the hydraulic cylinder are in abutting relationship. A convexly curved projection coaxial with the cylinder is formed on the piston for engaging a flat end surface on the piston rod. This arrangement minimizes the wear on the piston and, thus, increases the life of the hydraulic cylinder.
Inventors
- 👤 Frank F Domyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:59
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/02; F15B15/06; F15B15/066; F16; F16J; F16J1/00; F16J1/10; F16K; F16K31/00; F16K31/12; F16K31/16; F16K31/163; F16K31/1635
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
An actuator comprising: first means defining a cylinder and having a piston coaxially mounted in said cylinder for longitudinal slidable movement; a piston rod at least approximately coaxial with said cylinder and having one end slidable in said cylinder in spaced relationship thereto, said one end defining an essentially flat end surface facing said piston, said first means including a bearing fixed relative to said cylinder and having a bore in which said piston rod is slidable, the other end of said rod being an actuating member; said piston having a convex projection fixed relative thereto coaxial with said cylinder and extending toward said flat end surface on said rod; and second means causing said piston rod flat end surface and said piston projection to be biased into engagement with each other, said projection being out of contact with all structures except said piston and said piston rod flat end surface.
Claim 2
Dependent Claim
151 words
An actuator comprising: first means defining a cylinder and having a piston coaxially mounted in said cylinder for longitudinal slidable movement; a piston rod at least approximately coaxial with said cylinder and having one end slidable in said cylinder in spaced relationship thereto, said one end defining an essentially flat end surface facing said piston, said first means including a bearing fixed relative to said cylinder and having a bore in which said piston rod is slidable, the other end of said rod being an actuating member; said piston having a convex projection fixed relative thereto coaxial with said cylinder and extending toward said flat end surface on said rod; and second means causing said piston rod flat end surface and said piston projection to be biased into engagement with each other, said projection being out of contact with all structures except said piston and said piston rod flat end surface.
Claim 3
Dependent Claim
15 words
An actuator as set forth in claim 1, wherein said projection is hemispherical in shape.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |