US3213621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
External operating control means for a hydraulic transmission
Assignee: International Motors LLC
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Filing: 1964-09-08
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Granted: 1965-10-26
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Expires: 1984-09-08
Abstract
No abstract record available.
Inventors
- 👤 John F Swift
- 👤 Margolin William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/462; F16H61/42; F16H61/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
FOR AN INFINITELY VARIABLE SPEED RATIO HYDRAULIC POWER TRANSMISSION HAVING A HYDRAULIC POWER PUMP UNIT DRIVEN BY A POWER INPUT SHAFT AND A HYDRAULIC POWER MOTOR UNIT DRIVINGLY CONNECTED TO A POWER OUTPUT SHAFT, SAID UNITS BEING HYDRAULICALLY INTERCONNECTED THROUGH A HYDRAULIC WORKING CIRCUIT HAVING A HIGH PRESSURE SIDE AND A LOW PRESSURE SIDE OPERATIVE FOR TRANSMITTING POWER HYDRAULICALLY FROM SAID INPUT SHAFT TO SAID OUTPUT SHAFT, A HYDRAULIC RAM INCLUDING A FIRST SOURCE OF ENERGIZING FLUID PRESSURE THEREFOR POSITIONED TO VARY THE FLUID DISPLACEMENT OF AT LEAST ONE OF SAID UNITS, AND A FLUID PRESSURE ACTUATED DISPLACEMENT CONTROL VALVE RESPONSIVE TO A FLUID PRESSURE SIGNAL SOURCE OPERATIVELY CONNECTED THERETO WHEREBY THE SPEED RATIO OF SAID TRANSMISSION IS A FUNCTION OF THE VALUE OF SAID FLUID PRESSURE SIGNAL SOURCE; A CONTROL SYSTEM FOR CONTROLLING SELECTIVELY THE VALUE OF SAID FLUID PRESSURE SIGNAL SOURCE COMPRISING A VARIABLE SIGNAL PRESSURE REGULATOR COMMUNICATINGLY CONNECTED TO SAID DISPLACEMENT CONTROL VALVE AND A SECOND SOURCE OF FLUID UNDER PRESSURE IN OPERATIVE RELATION, AND MEANS FOR ADJUSTING SAID REGULATOR FOR SELECTIVELY CONTROLLIONG SAID SIGNAL PRESSURE WHEREBY THE SPEED RATIO OF SAID TRANSMISSION IS SELECTIVELY DETERMINED BY SAID REGULATOR.
Claim 2
Dependent Claim
192 words
FOR AN INFINITELY VARIABLE SPEED RATIO HYDRAULIC POWER TRANSMISSION HAVING A HYDRAULIC POWER PUMP UNIT DRIVEN BY A POWER INPUT SHAFT AND A HYDRAULIC POWER MOTOR UNIT DRIVINGLY CONNECTED TO A POWER OUTPUT SHAFT, SAID UNITS BEING HYDRAULICALLY INTERCONNECTED THROUGH A HYDRAULIC WORKING CIRCUIT HAVING A HIGH PRESSURE SIDE AND A LOW PRESSURE SIDE OPERATIVE FOR TRANSMITTING POWER HYDRAULICALLY FROM SAID INPUT SHAFT TO SAID OUTPUT SHAFT, A HYDRAULIC RAM INCLUDING A FIRST SOURCE OF ENERGIZING FLUID PRESSURE THEREFOR POSITIONED TO VARY THE FLUID DISPLACEMENT OF AT LEAST ONE OF SAID UNITS, AND A FLUID PRESSURE ACTUATED DISPLACEMENT CONTROL VALVE RESPONSIVE TO A FLUID PRESSURE SIGNAL SOURCE OPERATIVELY CONNECTED THERETO WHEREBY THE SPEED RATIO OF SAID TRANSMISSION IS A FUNCTION OF THE VALUE OF SAID FLUID PRESSURE SIGNAL SOURCE; A CONTROL SYSTEM FOR CONTROLLING SELECTIVELY THE VALUE OF SAID FLUID PRESSURE SIGNAL SOURCE COMPRISING A VARIABLE SIGNAL PRESSURE REGULATOR COMMUNICATINGLY CONNECTED TO SAID DISPLACEMENT CONTROL VALVE AND A SECOND SOURCE OF FLUID UNDER PRESSURE IN OPERATIVE RELATION, AND MEANS FOR ADJUSTING SAID REGULATOR FOR SELECTIVELY CONTROLLIONG SAID SIGNAL PRESSURE WHEREBY THE SPEED RATIO OF SAID TRANSMISSION IS SELECTIVELY DETERMINED BY SAID REGULATOR.
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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |