Patent US3138218A successfully refreshed from Google Patents.
US3138218A
Expired / Lapsed
US
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Hydraulic transmission control and steering system
Assignee: Massey Ferguson Inc
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Filing: 1962-04-03
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Granted: 1964-06-23
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Expires: 1982-04-03
Abstract
No abstract record available.
Inventors
- 👤 Mark Alexander Hing
- 👤 John J Denovan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:01
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/10; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/44; F16H61/456
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A VEHICLE HAVING A SHIFTABLE STEERING WHEEL MECHANISM AND A HYDRAULIC TRANSMISSION INCLUDING A PUMP AND A PAIR OF FLUID MOTORS DRIVING RESPECTIVE ONES OF A PAIR OF DRIVE WHEELS, THE COMBINATION COMPRISING, A DIFFERENTIAL VALVE HAVING AN INPUT LINE COUPLED TO THE OUTPUT OF SAID PUMP AND A PAIR OF OUTPUT LINES COUPLED RESPECTIVELY TO SAID FLUID MOTORS, SAID DIFFERENTIAL VALVE HAVING A DIVIDING VALVE AND CONTROL ELEMENTS THEREFOR TO PROPORTION FLUID BETWEEN SAID FLUID MOTORS AND PREVENT UNRESTRICTED RELATIVE ROTATION OF SAID WHEELS, AND A LINKAGE COUPLING SAID STEERING MECHANISM AND SAID DIVIDING VALVE SO THAT SHIFTING OF THE STEERING MECHANISM TO TURN THE VEHICLE POSITIONS THE DIVIDING VALVE TO DIRECT A GREATER PROPORTION OF FLUID TO THE DRIVE WHEEL AT THE OUTSIDE OF THE TURN, SAID LINKAGE INCLUDING A LOST MOTION CONNECTION PREVENTING SLIGHT SHIFTS OF THE STEERING MECHANISM FROM AFFECTING SAID DIVIDING VALVE.
Claim 2
Dependent Claim
148 words
IN A VEHICLE HAVING A SHIFTABLE STEERING WHEEL MECHANISM AND A HYDRAULIC TRANSMISSION INCLUDING A PUMP AND A PAIR OF FLUID MOTORS DRIVING RESPECTIVE ONES OF A PAIR OF DRIVE WHEELS, THE COMBINATION COMPRISING, A DIFFERENTIAL VALVE HAVING AN INPUT LINE COUPLED TO THE OUTPUT OF SAID PUMP AND A PAIR OF OUTPUT LINES COUPLED RESPECTIVELY TO SAID FLUID MOTORS, SAID DIFFERENTIAL VALVE HAVING A DIVIDING VALVE AND CONTROL ELEMENTS THEREFOR TO PROPORTION FLUID BETWEEN SAID FLUID MOTORS AND PREVENT UNRESTRICTED RELATIVE ROTATION OF SAID WHEELS, AND A LINKAGE COUPLING SAID STEERING MECHANISM AND SAID DIVIDING VALVE SO THAT SHIFTING OF THE STEERING MECHANISM TO TURN THE VEHICLE POSITIONS THE DIVIDING VALVE TO DIRECT A GREATER PROPORTION OF FLUID TO THE DRIVE WHEEL AT THE OUTSIDE OF THE TURN, SAID LINKAGE INCLUDING A LOST MOTION CONNECTION PREVENTING SLIGHT SHIFTS OF THE STEERING MECHANISM FROM AFFECTING SAID DIVIDING VALVE.
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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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |