Hydraulic hand jack with needle release valve

Details Hydraulic hand jack with needle release valve Hydraulic hand jack with needle release valve

B - Operations, Transporting

66

F

254/153

B66F 3/42 (2006.01)

Patent

CA 1064466

HYDRAULIC HAND JACK WITH NEEDLE RELEASE VALVE Abstract of the Disclosure A hydraulic vehicle jack including a novel release valve is disclosed. The jack is of the type having a high pres- sure cylinder, a ram partially extensible from and retractable into the cylinder, and a high pressure pump for forcing fluid from a reservoir into the cylinder to extend the jack. When it is desired to lower the jack, the release valve needle is turned so as to withdraw a needle tip from fluid-flow-halting engage- ment with a valve seat. This needle tip is formed in the shape of a cone having an altitude of a dimension greater than the cone base radius. When the needle tip is withdrawn from its po- sition against the valve seat, a small but precisely defined fluid-flow-permitting orifice is created. Valve lowering action then occurs over an extended time period which permits the jack operator to precisely control or halt valve lowering action as desired.

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