US3238723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic transmission
Assignee: New York Air Brake LLC
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Filing: 1964-02-17
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Granted: 1966-03-08
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 John E G Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:11
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/4157; F16H61/42; F16H61/46; F16H61/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A HYDROSTATIC TRANSMISSION COMPRISING (A) A PUMP; (B) A MOTOR; (C) MEANS INTERCONNECTING THE PUMP AND MOTOR IN A CLOSED TRANSMISSION CIRCUIT, SAID CIRCUIT CONSTITUTING THE SOLE POWER TRANSMITTING LINK BETWEEN THE PUMP AND MOTOR AND AFFORDING ONE SIDE IN WHICH A HIGH PRESSURE CAN BE DEVELOPED WHEN THE PUMP IS DRIVING THE MOTOR AND ANOTHER SIDE IN WHICH HIGH PRESSURE CAN BE DEVELOPED WHEN THE MOTOR IS DRIVING THE PUMP, (D) THE MOTOR BEING OF THE ROTARY CYLINDER BARREL, LONGITUDINALLY RECIPROCATING PISTON TYPE AND HAVING A CAM PLATE FOR VARYING DISPLACEMENT THAT IS BIASED TOWARD MINIMUM AND MAXIMUM DISPLACEMENT POSITION, RESPECTIVELY, BY THE FORCES TRANSFEREED BETWEEN THE CAM PLATE AND THE PISTONS WHEN THE MOTOR IS DRIVING THE PUMP AND THE PUMP IS DRIVING THE MOTOR; AND (E) MEANS, INCLUDING SAID PISTONS WHICH DEVELOP THE BIASING FORCES, FOR CONTROLLING POSITION OF THE CAM PLATE WHEN THE PUMP IS DRIVING THE MOTOR, AND FOR AUTOMATICALLY MOVING THE CAM PLATE TO A REDUCED DISPLACEMENT POSITION UPON THE OCCURRENCE OF AN OVERRUN CONDITION THAT CAUSES THE MOTOR TO DRIVE THE PUMP.
Claim 2
Dependent Claim
179 words
A HYDROSTATIC TRANSMISSION COMPRISING (A) A PUMP; (B) A MOTOR; (C) MEANS INTERCONNECTING THE PUMP AND MOTOR IN A CLOSED TRANSMISSION CIRCUIT, SAID CIRCUIT CONSTITUTING THE SOLE POWER TRANSMITTING LINK BETWEEN THE PUMP AND MOTOR AND AFFORDING ONE SIDE IN WHICH A HIGH PRESSURE CAN BE DEVELOPED WHEN THE PUMP IS DRIVING THE MOTOR AND ANOTHER SIDE IN WHICH HIGH PRESSURE CAN BE DEVELOPED WHEN THE MOTOR IS DRIVING THE PUMP, (D) THE MOTOR BEING OF THE ROTARY CYLINDER BARREL, LONGITUDINALLY RECIPROCATING PISTON TYPE AND HAVING A CAM PLATE FOR VARYING DISPLACEMENT THAT IS BIASED TOWARD MINIMUM AND MAXIMUM DISPLACEMENT POSITION, RESPECTIVELY, BY THE FORCES TRANSFEREED BETWEEN THE CAM PLATE AND THE PISTONS WHEN THE MOTOR IS DRIVING THE PUMP AND THE PUMP IS DRIVING THE MOTOR; AND (E) MEANS, INCLUDING SAID PISTONS WHICH DEVELOP THE BIASING FORCES, FOR CONTROLLING POSITION OF THE CAM PLATE WHEN THE PUMP IS DRIVING THE MOTOR, AND FOR AUTOMATICALLY MOVING THE CAM PLATE TO A REDUCED DISPLACEMENT POSITION UPON THE OCCURRENCE OF AN OVERRUN CONDITION THAT CAUSES THE MOTOR TO DRIVE THE PUMP.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |