Pawl and ratchet clutch with shifting pawl
Patent 5257685 Issued on November 2, 1993. Estimated Expiration Date: 
March 5, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 5, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1767593 2028441 2054747 3236348 3727733 Fluid pressure actuated clutch for starting multi-stage turbine Positive one-way clutch system Unidirectional drive systems Air turbine starter having a panel and ratchet clutch Turbine starter device InventorsApplicationNo. 847768 filed on 03/05/1992US Classes:192/46, Positive74/7C, Clutch connection192/42, Free-engine type192/104CTransversely engaged-exteriorExaminersPrimary: Bonck, Rodney H.Attorney, Agent or FirmForeign Patent References
International ClassesF16D 041/12F16D 043/04 F02N 015/00 AbstractA pneumatic starter (10) incorporates a pawl and ratchet clutch assembly (50) having a ratchet member (46) mounted to a drive member (40) powered by an air expansion turbine (20), and a plurality of pawls (48) disposed circumferentially about the ratchet member (46) and operable in engagement therewith to transmit rotational drive torque from the drive member (40) to a driven member (60). Each of the pawls (48) is supported on a pivot pin (54) for pivotal movement into and out of engagement with the ratchet member (46) and translation between a engaged and drive position and a disengaged and retracted position to effectuate a change in the location of the center of gravity (93) of the pawl relative to its pivot axis (55). Preload springs (54) are provided for biasing the pawls (48) to pivot radially inwardly into engagement with the ratchet member (46). A torsion spring (82) is disposed in operative association with each pawl (48) for shifting its associated pawl from its engaged and drive position to its disengaged and retracted position upon lift-off of the pawl from the ratchet member. | |
