Locking mechanism for fluid operated actuator

Details Locking mechanism for fluid operated actuator Locking mechanism for fluid operated actuator

1982-03-01

1984-09-11

Hershkovitz, Abraham

Expansible chamber devices

With releasable latch means between working member and power...

92 24, 92 85A, F01B 900

Patent

active

044703406

ABSTRACT:
An automatic mechanism is provided for locking the piston rod of a multi-position fluid operated linear actuator in its existing extreme axial position and to maintain such piston rod's position against unbiased forces acting on the piston rod, in the event of a failure of, or significant decrease in, the fluid pressure applied on the piston. A lost motion connection is provided between a piston head and the piston rod opposite the locking mechanism, permitting a limited amount of axial movement of the piston head relative to the piston rod. A locking mechanism is provided to automatically engage the piston rod whenever it reaches one of its two extreme axial positions and to lock the piston rod at that position. The locking mechanism is releasable by a cam structure provided on the piston head. The initial movement of the piston head relative to the piston rod in a direction toward the other axial position of the piston rod effects the camming of the locking mechanism to an unlocked position. Means are provided to hold the locking mechanism in its unlocked position whenever the piston rod is located at its other axial position.

REFERENCES:
patent: 2221121 (1940-11-01), Wallace
patent: 3072105 (1963-01-01), Johnson
patent: 3397620 (1968-08-01), Skelton
patent: 4248138 (1981-02-01), Akkerman

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