Patent US3142964A successfully refreshed from Google Patents.
US3142964A
Expired / Lapsed
US
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Hydraulic apparatus
Assignee: Dowty Hydraulic Units Ltd
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Filing: 1963-01-31
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Granted: 1964-08-04
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Expires: 1983-01-31
Abstract
No abstract record available.
Inventors
- 👤 Thomas Oswald
- 👤 Ward Edward Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:46
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/44; F16H61/456; B; B60; B60K; B60K17/00; B60K17/04; B60K17/10; F16H61/42; F16H61/427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A HYDRAULIC POWER TRANSMISSION COMPRISING A TILTING HEAD PUMP UNIT, A TILTING HEAD MOTOR UNIT, AT LEAST ONE HYDRAULIC CONNECTION BETWEEN PUMP AND MOTOR, SUPPORT, SHAFT BEARING MEANS IN THE SUPPORT WITHIN WHICH DRIVE SHAFTS OF THE PUMP AND MOTOR UNITS ARE ROTATABLY MOUNTED, TRUNNION BEARING MEANS IN THE SUPPORT WITHIN WHICH THE HEADS OF PUMP AND MOTOR UNITS ARE TILTABLY MOUNTED, A RIGID LINK OF INVARIABLE LENGTH PIVOTALLY CONNECTED TO THE PUMP HEAD AT A POSITION SPACED FROM ITS TILT AXIS AND PIVOTALLY CONNECTED TO THE MOTOR HEAD AT A POSITION SPACED FROM ITS TILT AXIS SO THAT PUMP AND MOTOR HEADS MAY ONLY MOVE SIMULTANEOUSLY, AND MEANS FOR ADJUSTING THE HEADS ABOUT THEIR TILT AXES, THE SHAFT BEARING MEANS BEING SO ARRANGED THAT THE AXES OF THE SHAFTS ARE IN NON-COAXIAL RELATION ONE TO THE OTHER, AND THE PIVOTAL CONNECTIONS OF THE LINK BEING SO ARRANGED THAT WHEN THE PUMP HEAD IS IN ITS MAXIMUM DISPLACEMENT POSITION THE MOTOR HEAD IS AT A MINIMUM DISPLACEMENT POSITION, GREATER THAN ZERO DISPLACEMENT.
Claim 2
Dependent Claim
172 words
A HYDRAULIC POWER TRANSMISSION COMPRISING A TILTING HEAD PUMP UNIT, A TILTING HEAD MOTOR UNIT, AT LEAST ONE HYDRAULIC CONNECTION BETWEEN PUMP AND MOTOR, SUPPORT, SHAFT BEARING MEANS IN THE SUPPORT WITHIN WHICH DRIVE SHAFTS OF THE PUMP AND MOTOR UNITS ARE ROTATABLY MOUNTED, TRUNNION BEARING MEANS IN THE SUPPORT WITHIN WHICH THE HEADS OF PUMP AND MOTOR UNITS ARE TILTABLY MOUNTED, A RIGID LINK OF INVARIABLE LENGTH PIVOTALLY CONNECTED TO THE PUMP HEAD AT A POSITION SPACED FROM ITS TILT AXIS AND PIVOTALLY CONNECTED TO THE MOTOR HEAD AT A POSITION SPACED FROM ITS TILT AXIS SO THAT PUMP AND MOTOR HEADS MAY ONLY MOVE SIMULTANEOUSLY, AND MEANS FOR ADJUSTING THE HEADS ABOUT THEIR TILT AXES, THE SHAFT BEARING MEANS BEING SO ARRANGED THAT THE AXES OF THE SHAFTS ARE IN NON-COAXIAL RELATION ONE TO THE OTHER, AND THE PIVOTAL CONNECTIONS OF THE LINK BEING SO ARRANGED THAT WHEN THE PUMP HEAD IS IN ITS MAXIMUM DISPLACEMENT POSITION THE MOTOR HEAD IS AT A MINIMUM DISPLACEMENT POSITION, GREATER THAN ZERO DISPLACEMENT.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |