| 摘要 |
A fail-safe fluid actuator comprising a piston slidably disposed within a cylinder. In the event of a pressure loss, the piston is urged to a fail-safe position by a plurality of externally mounted constant force spring mechanisms. In one embodiment the mechanisms are located at one end of the cylinder with a telescoping cover for protecting them from exposure and damage. In another embodiment the mechanisms are located at the side of the cylinder whereby the overall length of the actuator is significantly shortened. The fail-safe force applied to the piston by the spring mechanisms is externally adjustable, and they are readily accessible fur replacement or repair.
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