Hydraulic four-wheel jack

Details Hydraulic four-wheel jack Hydraulic four-wheel jack

1985-10-18

1986-06-24

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66F 324

Patent

active

045963789

ABSTRACT:
Structural improvements of a hydraulic four-wheel jack which protects the jack from damage resulting from overloading and/or overpumping, while offering a compact configuration having minimal space requirements. The jack incorporates a hydraulic unit assembly of the piston-and-cylinder variety in which the piston extends in an upwardly direction and bears against a cross-wise shaft being pivotably mounted between parallel cantilever arms, which carry on their respective free ends a lift assembly. The jack further incorporates a base having a unique series of interior passages provided with one-way, spring loaded ball-check-valves, whereby fluid communication is provided for the hydraulics of the jack.

REFERENCES:
patent: 2629582 (1953-02-01), Stephenson et al.
patent: 3967814 (1976-07-01), Leibundgut
patent: 4277048 (1981-07-01), Okuda
patent: 4359205 (1982-11-01), Amster et al.

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