Hydraulic power unit for jack system

Details Hydraulic power unit for jack system Hydraulic power unit for jack system

1990-04-03

1991-11-19

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66F 324

Patent

active

050659839

ABSTRACT:
A hydraulic power unit for a two-part jack system, having lifting arms which are raised or extended by means of hydraulic power whenever an associated jack stand is to be either raised or extended. The necessary hydraulic pressure is generated manually, by use of a hand pump. The power unit includes a single release valve which operates automatically as an excess-pressure bleed-off valve whenever the hydraulic cylinder pressure exceeds design capacity, and is also adapted to be controlled manually from the handle of the power unit for unloading total hydraulic pressure whenever the lifting arms are to be lowered. The release valve and all of its associated mechanisms are mounted in or on a single metallic block which is very easily manufacturable.

REFERENCES:
patent: 4131263 (1978-12-01), John
patent: 4222548 (1980-09-01), John
patent: 4277048 (1981-07-01), Okuda

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