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US3168295A
Expired / Lapsed
US
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Variable-ratio hydrostatic drives
Assignee: GE Healthcare UK Ltd
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Filing: 1963-06-26
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Granted: 1965-02-02
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Expires: 1983-06-26
Abstract
No abstract record available.
Inventors
- 👤 George W Dorrell
- 👤 Frank G Tunnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:29
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4206; B28C5/421; B28C5/4213; F16H61/472
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN AN AUTOMOTOVE CONCRETE MIXER HAVING A TRACTION ENGINE, ROADS WHEELS, MEANS, INCLUDING A NORMALLY ENGAGED CLUTCH, FOR TRANSMITTING DRIVING POWER FROM THE ENGINE TO THE ROAD WHEELS, A CLUTCH PEDAL OPERABLE TO DISENGAGE SAID CLUTCH, A ROTATABLE CONCRETE-MIXER DRUM, AND MEANS FOR TRANSMITTING ROTATION FROM THE ENGINE TO THE DRUM; THE COMBINATION COMPRISING A VARIABLE DISPLACEMENT PUMP, DRIVING BY THE ENGINE, A FIXED-DISPLACEMENT HYDRAULIC MOTOR DRIVINGLY CONNECTED WITH THE DRUM, A HYDRAULIC CIRCUIT FOR PASSING THE HYDRAULIC LIQUID DELIVERED BY A PUMP TO THE MOTOR AND RETURN IT FROM THE MOTOR TO THE PUMP, MEANS FOR VARYING THE DISPLACEMENT OF SAID PUMP FROM A POSITIVE MAXIMUM TO A NEGATIVE MAXIMUM, AND CIRCUIT INCLUDING A LINE THROUGH WHICH NORMALLY AT LEAST THE GREATER PART OF THE LIQUID DISPLACED BY THE PUMP MOVES FROM THE PUMP TO THE MOTOR, SAID LINE INCLUDING A RESTRICTOR, A HYDRAULIC SERVOMOTOR, OPERABLE BY THE PRESSURE DROP IN SAID RESTRICTOR AGAINST SPRING ACTION, WHEN THE DELIVERY OF SAID PUMP IS POSITIVE TO REDUCE SAID
Claim 2
Dependent Claim
168 words
IN AN AUTOMOTOVE CONCRETE MIXER HAVING A TRACTION ENGINE, ROADS WHEELS, MEANS, INCLUDING A NORMALLY ENGAGED CLUTCH, FOR TRANSMITTING DRIVING POWER FROM THE ENGINE TO THE ROAD WHEELS, A CLUTCH PEDAL OPERABLE TO DISENGAGE SAID CLUTCH, A ROTATABLE CONCRETE-MIXER DRUM, AND MEANS FOR TRANSMITTING ROTATION FROM THE ENGINE TO THE DRUM; THE COMBINATION COMPRISING A VARIABLE DISPLACEMENT PUMP, DRIVING BY THE ENGINE, A FIXED-DISPLACEMENT HYDRAULIC MOTOR DRIVINGLY CONNECTED WITH THE DRUM, A HYDRAULIC CIRCUIT FOR PASSING THE HYDRAULIC LIQUID DELIVERED BY A PUMP TO THE MOTOR AND RETURN IT FROM THE MOTOR TO THE PUMP, MEANS FOR VARYING THE DISPLACEMENT OF SAID PUMP FROM A POSITIVE MAXIMUM TO A NEGATIVE MAXIMUM, AND CIRCUIT INCLUDING A LINE THROUGH WHICH NORMALLY AT LEAST THE GREATER PART OF THE LIQUID DISPLACED BY THE PUMP MOVES FROM THE PUMP TO THE MOTOR, SAID LINE INCLUDING A RESTRICTOR, A HYDRAULIC SERVOMOTOR, OPERABLE BY THE PRESSURE DROP IN SAID RESTRICTOR AGAINST SPRING ACTION, WHEN THE DELIVERY OF SAID PUMP IS POSITIVE TO REDUCE SAID
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |