Hydraulic hand jack with needle release valve

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

1977-01-04

1978-03-14

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60481, 251122, 254 93H, F15B 1518, B66F 324

Patent

active

040783839

ABSTRACT:
A hydraulic vehicle jack including a novel release valve is disclosed. The jack is of the type having a high pressure 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 engagement 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 When the needle tip is withdrawn from its position against the valve seat, a small but precisely defined fluid-flow-permitting orifice is created.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.

REFERENCES:
patent: 2527841 (1950-10-01), Mueller
patent: 2548902 (1951-04-01), Mueller
patent: 2739808 (1956-03-01), Carlson
patent: 2822789 (1958-02-01), Philips et al.

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