US3173259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle hydraulic transmission systems
Assignee: ZF International UK Ltd
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Filing: 1964-07-10
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Granted: 1965-03-16
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Expires: 1984-07-10
Abstract
No abstract record available.
Inventors
- 👤 Harbidge John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:20
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/423; F16H61/44; F16H61/456; F16H61/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A VEHICLE HYDRAULIC TRANSMISSION SYSTEM OF THE KIND SPECIFIED COMPRISING IN COMBINTION, A PAIR OF SERVOCYLINDERS FOR CONTROLLING THE STROKES OF THE PAIR OF MOTORS RESPECTIVELY, A PAIR OF SPOOL VALVES FOR CONTROLLING THE FLOW OF FLUID TO AND FROM SAID SERVO-CYLINDERS RESPECTIVELY, THE SPOOLS, OF SAID VALVES BEING DISPOSED SIDE-BY-SIDE IN PARALLEL RELATIONSHIP, A ROCKABLE MEMBER ADAPTED TO BEAR UPON ONE PAIR OF ADJACENT ENDS OF THE SPOOLS WITH A FORCE DEPENDENT UPON THE PRESSURE IN THE SYSTEM BETWEEN THE PUMP AND THE PAIR OF MOTORS, A PAIR OF SPRINGS URGING THE PAIR OF SPOOLS RESPECTIVELY AGAINST SAID MEMBER, AND A PAIR OF WEDGES MOVABLE RESPECTIVELY BY THE PAIR OF SERVOCYLINDERS BETWEEN THE PAIR OF SPRINGS AND THE PAIR OF SPOOLS, THE ARRANGEMENT BEING SUCH THAT IN THE EVENT OF THE STROKE OF ONE MOTOR BECOMING GREATER THAN THE OTHER, THE ASSOCIATED VALVE WILL BE MOVED BY ITS WEDGE PIECE TO REDUCE THE STROKE OF SAID ONE MOTOR, WHILST TENDING TO CAUSE THE OTHER VALVE TO INCREASE THE STROKE OF SAID OTHER MOTOR.
Claim 2
Dependent Claim
174 words
A VEHICLE HYDRAULIC TRANSMISSION SYSTEM OF THE KIND SPECIFIED COMPRISING IN COMBINTION, A PAIR OF SERVOCYLINDERS FOR CONTROLLING THE STROKES OF THE PAIR OF MOTORS RESPECTIVELY, A PAIR OF SPOOL VALVES FOR CONTROLLING THE FLOW OF FLUID TO AND FROM SAID SERVO-CYLINDERS RESPECTIVELY, THE SPOOLS, OF SAID VALVES BEING DISPOSED SIDE-BY-SIDE IN PARALLEL RELATIONSHIP, A ROCKABLE MEMBER ADAPTED TO BEAR UPON ONE PAIR OF ADJACENT ENDS OF THE SPOOLS WITH A FORCE DEPENDENT UPON THE PRESSURE IN THE SYSTEM BETWEEN THE PUMP AND THE PAIR OF MOTORS, A PAIR OF SPRINGS URGING THE PAIR OF SPOOLS RESPECTIVELY AGAINST SAID MEMBER, AND A PAIR OF WEDGES MOVABLE RESPECTIVELY BY THE PAIR OF SERVOCYLINDERS BETWEEN THE PAIR OF SPRINGS AND THE PAIR OF SPOOLS, THE ARRANGEMENT BEING SUCH THAT IN THE EVENT OF THE STROKE OF ONE MOTOR BECOMING GREATER THAN THE OTHER, THE ASSOCIATED VALVE WILL BE MOVED BY ITS WEDGE PIECE TO REDUCE THE STROKE OF SAID ONE MOTOR, WHILST TENDING TO CAUSE THE OTHER VALVE TO INCREASE THE STROKE OF SAID OTHER MOTOR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |