Hydraulic valve lifter with pump-up prevention means
Abstract
Abstract A HYDRAULIC VALVE LIFTER INCLUDES BODY AND PLUNGER MEMBERS WHICH COOPERATE TO DEFINE A PRESSURE CHAMBER. THE HYDRAULIC VALVE LIFTER INCLUDES MEANS FOR PREVENTING "PUMP-UP" OF THE LIFTER UNDER THE INFLUENCE OF SURGING OF AN ENGINE VALVE SPRING AND FOR MINIMINZING LASH IN THE VALVE TRAIN AT COLD ENGINE STARTING CONDITIONS. THE MEANS FOR PREVENTING "PUMP-UP" INCLUDES A CHECK VALVE MEMBER, MOVABLE BETWEEN A FIRST LIMIT POSITION IN WHICH THE VALVE MEMBER BLOCKS A FLOW OF FLUID TO THE PRESSURE CHAMBER AND A SECOND LIMIT POSITION IN WHICH THER IS A RESTRICTED FLOW OF FLUID TO THE PRESSURE CHAMBER. THE RESTRICTED FLOW OF FLUID PREVENTS "PUM-UP" OF THE LIFTER DURING SURGING OF THE ENGINE VALVE TRAIN AND ALSO PREVENTS LASH IN THE VALVE TRAIN DURING COLD ENGINE STARTING CONDITIONS.
Inventors
- 👤 Gerald D Line
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |