Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1978-08-25
1980-12-23
Hershkovitz, Abraham
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 21MR, 92 24, 92 27, 92 85A, 92 85B, F01B 2526
Patent
active
042403324
ABSTRACT:
A fluid pressure actuator which locks in the extended position. The lock is a roller operated, dual segment pawl mechanism that unlocks in response to a pressure difference between extend and retract pressures. The two lock segments, chamfered for engagement with the cylinder end, are in diametrically opposed slots in the actuator piston head. A cylindrical section projects from the segment portion. An end view of the lock is mushroom shaped. Two rollers, held in alignment normal to the actuator centerline by a cage integral with the unlock rod, operate in conjunction with the lock cam surfaces in such a manner as to carry the radial loading imposed when in the lock mode.
In operation, when the actuator is driven to its extreme extend position, the pawls are driven out by the rollers and lock against the cylinder end. The linear force on the rollers is due to the preload spring plus the hydraulic pressure differential (extend pressure greater than retract pressure). Depressurization will not disengage the lock since the spring acting on the unlock rod prevents the radially loaded rollers from uncamming the lock.
The lock can be disengaged by fluid pressure (e.g. hydraulically) or manually. When a hydraulic retract differential pressure is applied to the actuator, a force is applied to the unlocking rod. When this differential is sufficiently large, it overcomes the spring on the unlock rod driving the rollers out of their locking position and permitting the cylinder end to cam the pawls in and disengage the lock.
REFERENCES:
patent: 2295961 (1942-09-01), Meyer
patent: 2515712 (1950-07-01), Horton
patent: 2949890 (1960-08-01), Chace
patent: 3107582 (1963-10-01), Royster
patent: 3203319 (1965-08-01), Cook
patent: 3217609 (1965-11-01), Royster
patent: 3217610 (1965-11-01), Roskin
patent: 4043254 (1977-08-01), Jaeger
Arkwin Industries, Inc.
Glass Hyman F.
Hershkovitz Abraham
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