US3247919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic transmission
Assignee: Sundstrand Corp
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Filing: 1963-11-21
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Granted: 1966-04-26
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Expires: 1983-11-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry C Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/47; B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/10; B62D11/14; B62D11/18; B62D11/183; F16H61/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
324 words
A STEERING SYSTEM FOR A VEHICLE HAVING A SEPARATE PROPELLING MEANS AT OPPOSITE SIDES THEREOF MOVABLE AT THE SAME SPEED FOR PURPOSES OF STRAIGHT TRACKING AND AT DIFFERENT SPEEDS FOR PURPOSES OF STEERING, COMPRISING: A PAIR OF DRIVE SHAFTS AT OPPOSITE SIDES OF THE VEHICLE RESPECTIVELY ADAPTED FOR CONNECTION WITH THE PROPELLING MEANS; A PAIR OF HYDROSTATIC TRANSMISSIONS RESPECTIVELY CONNECTED TO THE DRIVE SHAFTS FOR DRIVING THE LATTER, EACH TRANSMISSION INCLUDING A PUMP DEVICE, A MOTOR DEVICE COMMUNICATING WITH THE PUMP DEVICE, AND MEANS FOR VARYING THE DISPLACEMENT OF AT LEAST ONE DEVICE RELATIVE TO THE OTHER THEREBY TO VARY THE INPUT-TO-OUTPUT SPEED RATIO THEREOF; MANUALLY CONTROLLABLE MEANS MECHANICALLY CONNECTED TO THE DISPLACEMENT VARYING MEANS FOR MOVING THE LATTER IN A FIRST MODE TO VARY THE SPEED OF THE TRANSMISSIONS SIMILARLY TO VARY THE SPEED OF THE VEHICLE; MEANS FOR VARYING THE SPEED OF THE TRANSMISSIONS DIFFERENTLY FOR TURNING THE VEHICLE INCLUDING, A PISTON AND CYLINDER DEVICE MECHANICALLY CONNECTED TO THE MANUALLY CONTROLLABLE MEANS FOR MOVING THE LATTER IN A SECOND MODE TO VARY THE SPEED OF THE TRANSMISSIONS DIFFERENTLY FOR TURNING THE VEHICLE, A SOURCE OF CONTROL FLUID UNDER PRESSURE, AND MANUALLY OPERABLE VALVE MEANS FOR CONTROLLING THE FLOW OF CONTROL FLUID TO OPPOSITE SIDES OF THE PISTON AND CYLINDER DEVICE; AND MEANS FOR CONTROLLING THE DISPLACEMENT VARYING MEANS TO CAUSE THE VEHICLE TO TRACK IN A STRAIGHT LINE INCLUDING, MEANS CONNECTED TO SAID DRIVE SHAFT FOR SENSING A DIFFERENCE IN SPEED OF THE DRIVE SHAFTS RELATIVE TO EACH OTHER AND PRODUCING A SIGNAL PROPORTIONAL IN A DIRECTION AND MAGNITUDE TO THE DIFFFERENCE AND A REVERSIBLE CONTROL PUMP HAVING OPPOSITE SIDES IN CONSTANT OPEN COMMUNICATION WITH OPPOSITE SIDES OF SAID PISTON AND CYLINDER DEVICE AND RESPONSIVE TO SAID SENSING MEANS SIGNAL FOR SUPPLYING CONTROL FLUID UNDER PRESSURE TO SAID PISTON AND CYLINDER DEVICE IN A DIRECTION AND AT A RATE PROPORTIONAL TO SAID DIFFERENCE TO TEND TO EQUALIZE THE SPEEDS OF THE TRANSMISSIONS.
References Cited (Backward Citations)
US3025722A
Cited
US3085403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |