US3293932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch control
Assignee: Dowty Hydraulic Units Ltd
•
Filing: 1963-12-03
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Granted: 1966-12-27
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Expires: 1983-12-03
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Boydell
- 👤 Bertram C Kempson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:37
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/02; F16D25/00; F16D25/12; F16D25/14; F16H; F16H47/00; F16H47/02; F16H47/04; F16H59/00; F16H59/36; F16H59/46; F16D2048/0209; F16D2048/0227; F16D2048/0254; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19153; Y10T74/19158; Y10T74/19163; Y10T74/19219; Y10T74/19284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN COMBINATION, A HYDROSTATIC POWER TRANSMISSION AND A STEP CHANGE MECHANICAL GEAR BOX ARRANGED IN SERIES FOR THE TRANSMISSION OF POWER FROM A POWER SOURCE TO A LOAD, A CLUTCH ASSOCIATED WITH GEAR BOX AND HAVING DRIVING AND DRIVEN SHAFTS THROUGH WHICH THE POWER PASSES FROM THE TRANSMISSION TO THE LOAD, A SPEED RADIO CONTROL FOR THE TRANSMISSION, A GEAR SELECTING CONTROL FOR THE GEAR BOX, OVERRIDER MEANS RESPONSIVE TO EACH CHANGE OF GEAR BY THE GEAR SELECTING MEANS, TO DISENGAGE THE CLUTCH AND OVERRIDE THE SPEED RATION ADJUSTMENT OF THE TRANSMISSION SPEED RATION CONTROL, SO AS TO CAUSE AN INCREASE OR DECREASE IN THE TRANSMISSION SPEED RATIO IN ACCORD WITH THE DECREASE OR INCREASE, RESPECTIVELY, IN THE GEAR BOX SPEED RATIO, AND SPEED DIFFERENCE MEANS RESPONSIVE TO THE GEAR CHANGE TO TERMINATE THE CONTROL OF THE OVERRIDE MEANS AND RE-ENGAGE THE CLUTCH WHEN THE SPEEDS OF THE DRIVING AND DRIVEN SHAFTS ON THE CLUTCH BECOME EQUAL.
Claim 2
Dependent Claim
157 words
IN COMBINATION, A HYDROSTATIC POWER TRANSMISSION AND A STEP CHANGE MECHANICAL GEAR BOX ARRANGED IN SERIES FOR THE TRANSMISSION OF POWER FROM A POWER SOURCE TO A LOAD, A CLUTCH ASSOCIATED WITH GEAR BOX AND HAVING DRIVING AND DRIVEN SHAFTS THROUGH WHICH THE POWER PASSES FROM THE TRANSMISSION TO THE LOAD, A SPEED RADIO CONTROL FOR THE TRANSMISSION, A GEAR SELECTING CONTROL FOR THE GEAR BOX, OVERRIDER MEANS RESPONSIVE TO EACH CHANGE OF GEAR BY THE GEAR SELECTING MEANS, TO DISENGAGE THE CLUTCH AND OVERRIDE THE SPEED RATION ADJUSTMENT OF THE TRANSMISSION SPEED RATION CONTROL, SO AS TO CAUSE AN INCREASE OR DECREASE IN THE TRANSMISSION SPEED RATIO IN ACCORD WITH THE DECREASE OR INCREASE, RESPECTIVELY, IN THE GEAR BOX SPEED RATIO, AND SPEED DIFFERENCE MEANS RESPONSIVE TO THE GEAR CHANGE TO TERMINATE THE CONTROL OF THE OVERRIDE MEANS AND RE-ENGAGE THE CLUTCH WHEN THE SPEEDS OF THE DRIVING AND DRIVEN SHAFTS ON THE CLUTCH BECOME EQUAL.
References Cited (Backward Citations)
US1686827A
Cited
US1702721A
Cited
FR41264E
Cited
US2833160A
Cited
FR1069762A
Cited
GB854031A
Cited
US3103826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |