Hydraulic shifting mechanism for a mechanical transmission
Abstract
Abstract A HYDRAULIC SHIFTING MECHANISM FOR A MECHANICAL TRANSMISSION OF THE TYPE HAVING A PLURALITY OF SHIFTABLE PISTONS FOR PRODUCING CORRESPONDING SHIFTING MOVEMENTS IN THE TRANSMISSION, AND HAVING A MANUAL SHIFT LEVER AND THREE PISTONS, INCLUDING A LOWER CENTRAL ONE AND TWO UPPER, LATERALLY-SPACED ONES, THE SHIFT LEVER BEING MOVABLE LATERALLY FOR SELECTIVELY ENGAGING THE PISTONS, AND MOVABLE FOREAND-BACK FOR SHIFTING THE SELECTED PISTON, THE SHIFT LEVER HAS A LOWER END ENGAGEABLE WITH THE SELECTED PISTON, AND IS INCORPORATED IN A UNIT HAVING SIDE ELEMENTS MOVABLE LATERALLY WITH THE SHIFT LEVER BUT FIXED AGAINST FORE-AND-BACK MOVEMENT, THE PISTONS HAVING NOTCHES AND GROOVES RE- CEIVING THE SIDE ELEMENTS, THE SIDE ELEMENTS WHEN THE SHIFT LEVER IS IN NEUTRAL OR CENTRAL POSITION, RESPECTIVELY RESTAIN THE CORRESPONDING UPPER PISTONS AGAINST FORE-ANDBACK MOVEMENT AND WHEN THE SHIFT LEVER IS MOVED LATERALLY IN EITHER DIRECTION, ONE OF THE SIDE ELEMENTS RELEASES THE CORRESPONDING UPPER PISTON AND RESTRAINS THE LOWER PISTON AGAINST FORE-AND-BACK MOVEMENT, WHILE THE OTHER SIDE ELEMENT CONTINUES TO RESTRAIN ITS CORRESPONDING UPPER PISTON.
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Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |