US3922953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for limiting the force of reaction in hydraulic servo-control devices
Assignee: Langen and Co
•
Filing: 1973-11-12
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Granted: 1975-12-02
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Expires: 1993-11-12
Abstract
Abstract A system for limiting the force of reaction in hydraulic servocontrol devices in which there is provided an actuating member as well as a power output member, with the power output member being relatively movable in relation to the actuating member and communicating with a servo-motor provided with working or operating spaces in which the relative movement which results between the actuating member and the power output member is effected for activating a valve mechanism which connects the working or operating spaces interchangably with a pressure source or a drain in the sense of amplifying means. Reaction members are provided for reacting upon the actuating member and the reaction members are stressed in the reaction chamber by the pressures of the working spaces or their proportional pressures up to a predetermined value, and are then subjected, by a pressurelimitation, of a pressure only which is of a substantially constant value.
Inventors
- 👤 Gunther Strauff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:05
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/061; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
191 words
A system for limiting the force of reaction in hydraulic servo-control devices, comprising in combination an actuating member, a servo-motor provided with working chambers defined by movable members including a piston and a cylinder, a power output member movable relative to the actuating member and connected to one of the movable members of the servo-motor, a valve mechanism connecting the working chambers of the servo-motor interchangeably with a fluid pressure source and a drain, means for actuating said valve mechanism upon relative movement between the actuating member and the power output member drain and reaction members operatively connected to the actuating member for reacting upon the actuating member and defining reaction chambers, the reaction members being subject to pressure developed in the reaction chambers, each reaction chamber being connected with a respective working chamber, the pressure in the reaction chambers being limited to a predetermined value, whereby said reaction members are subjected to a pressure-limitation of a substantially constant value, the improvement comprising means connecting each reaction chamber with a respective working chamber via throttle means and a single pressure-limiting valve means connected to each reaction chamber via one-way valve means.
Claim 2
Independent Claim
191 words
A system for limiting the force of reaction in hydraulic servo-control devices, comprising in combination an actuating member, a servo-motor provided with working chambers defined by movable members including a piston and a cylinder, a power output member movable relative to the actuating member and connected to one of the movable members of the servo-motor, a valve mechanism connecting the working chambers of the servo-motor interchangeably with a fluid pressure source and a drain, means for actuating said valve mechanism upon relative movement between the actuating member and the power output member drain and reaction members operatively connected to the actuating member for reacting upon the actuating member and defining reaction chambers, the reaction members being subject to pressure developed in the reaction chambers, each reaction chamber being connected with a respective working chamber, the pressure in the reaction chambers being limited to a predetermined value, whereby said reaction members are subjected to a pressure-limitation of a substantially constant value, the improvement comprising means connecting each reaction chamber with a respective working chamber via throttle means and a single pressure-limiting valve means connected to each reaction chamber via one-way valve means.
Claim 3
Dependent Claim
16 words
The system as claimed in claim 1 in which said one-way valve means comprise ball valves.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |