Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1983-06-28
1985-04-09
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
92 137, 60479, F15B 1518
Patent
active
045097232
ABSTRACT:
A portable hydraulic lifting jack for automobiles comprising a ram cylinder receiving a ram therein, and a plunger cylinder receiving a plunger therein so that the lift head may be hydraulically lifted as the plunger is pumped by a lever, wherein a socket for receiving the lever for activating the plunger is divided into two parts so that the distance between the fulcrum belonging to one of the two parts of the socket and the working end belonging to the other part may be varied according to the need. Since the stroke of the plunger may be varied for the motion of the lever of the lever over a fixed angle, the lifting jack of this invention may be useful for speeding up the motion of the lift head when there is no or very little load thereon, for reducing the force required to be applied to the free end of the lever when the load on the lift head is heavy, and for allowing the lift head to be lifted fairly quickly even when there is limited space for the motion of the lever, without compromising the compactness of the lifting jack or involving any complication of its mechanical and hydraulic structure.
REFERENCES:
patent: 2092738 (1937-09-01), Rodgers
patent: 2328483 (1943-08-01), Nilson
patent: 2436916 (1948-03-01), Copeland
patent: 3530771 (1970-09-01), Bowman
patent: 3806091 (1974-04-01), Wride
patent: 4048800 (1977-09-01), Cancilla
Watson Robert C.
Yasui Sangyo Co. Ltd.
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