Patent US3302487A successfully refreshed from Google Patents.
US3302487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Dowty Hydraulic Units Ltd
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Filing: 1963-09-20
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Granted: 1967-02-07
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Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
- 👤 Kempson Bertram Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:45
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/433; B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; F16H47/00; F16H47/02; F16H47/04; F16H61/02; F16H61/0262; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088; F16H2716/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
277 words
IN COMBINATION WITH A POWER SOURCE, A POSITIVE DISPLACEMENT HYDRAULIC PUMP DRIVEN BY THE POWER SOURCE, AND A POSITIVE DISPLACEMENT HYDRAULIC MOTOR HYDRAULICALLY CONNECTED TO THE PUMP TO FORM A HYDRAULIC POWER TRANSMISSION, A STEP-CHANGE MECHANICAL GEAR BOX DRIVEN BY THE MOTOR AND HAVING AT LEAST TWO MECHANICAL GEAR RATIOS, A HYDRAULIC TRANSMISSION SPEED CONTROL MEANS WHICH IS ADJUSTABLE TO VARY THE OUTPUT SPEED OF THE HYDRAULIC TRANSMISSION, AND RESPONSIVE TO A CHANGE IN THE PUMP SPEED TO VARY THE OUTPUT SPEED OF THE HYDRAULIC TRANSMISSION IN THE SENSE OF MAINTAINING THE PUMP SPEED CONSTANT, AND GEAR CHANGE MEANS OPERATIVE TO SELECT ONE GEAR RATIO AT A TIME, AND RESPONSIVE TO ADJUSTMENT OF THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS TO A SETTING CORRESPONDING TO A RELATIVELY LOW HYDRAULIC TRANSMISSION SPEED, TO SELECT THE LOWER FIXED GEAR RATIO, AND TO ADJUSTMENT OF THE TRANSMISSION SPEED CONTROL MEANS TO A SETTING CORRESPONDING TO A RELATIVELY HIGH HYDRAULIC TRANSMISSION OUTPUT SPEED TO SELECT THE HIGHER FIXED GEAR RATIO, SAID GEAR CHANGE MEANS INCLUDING A DEPRESSIBLE ACTUATOR MEMBER FOR EACH GEAR RATIO, OF WHICH THAT CORRESPONDING TO THE LOWER GEAR RATIO IS OPERATIVE TO ENGAGE THE LOWER GEAR RATIO AND DISENGAGE THE HIGHER RATIO WHEN DEPRESSED, AND THAT CORRESPONDING TO THE HIGHER RATIO IS OPERATIVE TO ENGAGE THE HIGHER GEAR RATIO AND DISENGAGE THE LOWER GEAR RATIO WHEN DEPRESSED, AND A CAM MEMBER WHICH IS OPERATIVE TO DEPRESS THE FIRST DESCRIBED ACTUATOR MEMBER WHEN THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS IS ADJUSTED TO ITS RELATIVELY LOW SPEED SETTING, AND TO DEPRESS THE SECOND DESCRIBED ACTUATOR MEMBER WHEN THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS IS ADJUSTED TO ITS RELATIVELY HIGH SPEED SETTING.
Claim 2
Dependent Claim
277 words
IN COMBINATION WITH A POWER SOURCE, A POSITIVE DISPLACEMENT HYDRAULIC PUMP DRIVEN BY THE POWER SOURCE, AND A POSITIVE DISPLACEMENT HYDRAULIC MOTOR HYDRAULICALLY CONNECTED TO THE PUMP TO FORM A HYDRAULIC POWER TRANSMISSION, A STEP-CHANGE MECHANICAL GEAR BOX DRIVEN BY THE MOTOR AND HAVING AT LEAST TWO MECHANICAL GEAR RATIOS, A HYDRAULIC TRANSMISSION SPEED CONTROL MEANS WHICH IS ADJUSTABLE TO VARY THE OUTPUT SPEED OF THE HYDRAULIC TRANSMISSION, AND RESPONSIVE TO A CHANGE IN THE PUMP SPEED TO VARY THE OUTPUT SPEED OF THE HYDRAULIC TRANSMISSION IN THE SENSE OF MAINTAINING THE PUMP SPEED CONSTANT, AND GEAR CHANGE MEANS OPERATIVE TO SELECT ONE GEAR RATIO AT A TIME, AND RESPONSIVE TO ADJUSTMENT OF THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS TO A SETTING CORRESPONDING TO A RELATIVELY LOW HYDRAULIC TRANSMISSION SPEED, TO SELECT THE LOWER FIXED GEAR RATIO, AND TO ADJUSTMENT OF THE TRANSMISSION SPEED CONTROL MEANS TO A SETTING CORRESPONDING TO A RELATIVELY HIGH HYDRAULIC TRANSMISSION OUTPUT SPEED TO SELECT THE HIGHER FIXED GEAR RATIO, SAID GEAR CHANGE MEANS INCLUDING A DEPRESSIBLE ACTUATOR MEMBER FOR EACH GEAR RATIO, OF WHICH THAT CORRESPONDING TO THE LOWER GEAR RATIO IS OPERATIVE TO ENGAGE THE LOWER GEAR RATIO AND DISENGAGE THE HIGHER RATIO WHEN DEPRESSED, AND THAT CORRESPONDING TO THE HIGHER RATIO IS OPERATIVE TO ENGAGE THE HIGHER GEAR RATIO AND DISENGAGE THE LOWER GEAR RATIO WHEN DEPRESSED, AND A CAM MEMBER WHICH IS OPERATIVE TO DEPRESS THE FIRST DESCRIBED ACTUATOR MEMBER WHEN THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS IS ADJUSTED TO ITS RELATIVELY LOW SPEED SETTING, AND TO DEPRESS THE SECOND DESCRIBED ACTUATOR MEMBER WHEN THE HYDRAULIC TRANSMISSION SPEED CONTROL MEANS IS ADJUSTED TO ITS RELATIVELY HIGH SPEED SETTING.
References Cited (Backward Citations)
US2893269A
Cited
US3212358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |