Fluid actuator

Brakes – Operators – Fluid pressure

Reexamination Certificate

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Details

C188S033000, C188S265000, C303S089000

Reexamination Certificate

active

10752543

ABSTRACT:
An actuator responsive to fluid signals to retract and extend a piston. The actuator includes a cylinder and a pressure piston carried inside the cylinder. Also included is a shaft, and a rod connected to the pressure piston. The actuator further includes a first port for receiving a fluid pressure to move the pressure piston to a first position. The actuator also has a locking mechanism. The locking mechanism has a first and second surface, and both surfaces are movable in response to the fluid pressure at the first port. The surfaces lock the pressure piston in a first position upon removal of the fluid pressure at the first port.

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“Evaluation of a Hydraulic Freight-Car Parking Brake”, Paul B. McMahan, Technology Digest, Aug. 1998.

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