Patent US3566748A successfully refreshed from Google Patents.
US3566748A
Expired / Lapsed
US
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Dual-acting, redundant, hydraulic cylinder arrangement for air and spacecraft
Assignee: Entwicklungsring Sued GmbH
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Filing: 1968-08-19
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Granted: 1971-03-02
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Expires: 1988-08-19
Abstract
Abstract A dual-acting, redundant hydraulic cylinder including a first hydraulic cylinder system arranged radially around a second hydraulic system. Each of the systems is provided with a common piston. In accordance with the illustrated embodiment, the piston is constructed so that the working area associated with the first hydraulic system is approximately equal to the working area defined by the second hydraulic system.
Inventors
- 👤 Edmund Norbert Mahler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:31
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1466; B; B64; B64G; B64G1/00; B64G1/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A dual-acting, redundant hydraulic cylinder system particularly adapted for air and spacecraft comprising a first hydraulic system and a second hydraulic system each including a source of pressurized hydraulic fluid and a control valve, a common piston and cylinder for each of said systems, said piston having a pair of effective working areas for each of said systems, means communicating said common piston and cylinder to said source through said control valves, and means for actuating said valves whereby said systems cooperate to drive said common piston in the same direction.
Claim 2
Dependent Claim
91 words
A dual-acting, redundant hydraulic cylinder system particularly adapted for air and spacecraft comprising a first hydraulic system and a second hydraulic system each including a source of pressurized hydraulic fluid and a control valve, a common piston and cylinder for each of said systems, said piston having a pair of effective working areas for each of said systems, means communicating said common piston and cylinder to said source through said control valves, and means for actuating said valves whereby said systems cooperate to drive said common piston in the same direction.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 wherein the effective working area of the common piston subjected to pressure in the first hydraulic system is equal to the effective working area of the common piston subjected to pressure in the second hydraulic system.
Claim 4
Dependent Claim
25 words
A system as defined in claim 1 wherein said common piston and cylinder is a double-acting piston and cylinder and said valves are 4-way valves.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |