Hydraulic actuator with automatic travel limit bypass

Details Hydraulic actuator with automatic travel limit bypass Hydraulic actuator with automatic travel limit bypass

1979-08-24

1981-07-07

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

254 2B, 91401, B66F 324

Patent

active

042770483

ABSTRACT:
A hydraulically operated lifting device, such as a portable swinging-arm floor jack a low-rise forklift, or a high-rise forklift is provided with a piston-and-cylinder actuator having a closure member at one end of the cylinder through which a bore extends which supports a piston of the desired length and which is of uniform diameter throughout. The closure member has a radial bypass opening to a central point of the bore which communicates with a reservoir surrounding the cylinder and the inner end of the piston is provided with a passage which communicates with the bypass opening at the outer travel limit of the piston to recirculate fluid to the reservoir to prevent further pressure build-up. The bore includes fluid seals on each side of the bypass opening to prevent fluid leakage.

REFERENCES:
patent: 3347049 (1967-10-01), Fattersack et al.
patent: 3890684 (1975-06-01), Tallman
patent: 3967814 (1976-07-01), Leibundgut

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