Reciprocating device and switching mechanism therefor
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United States of America Patent
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-
May 9, 1989
Grant Date -
N/A
app pub date -
Dec 30, 1987
filing date -
Dec 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reciprocating device comprising a housing having a chamber and a reciprocable member reciprocable in the chamber. First and second pressure valves are connectible to a source of fluid under pressure to drive the reciprocable member and first and second passages lead from the first and second pressure valves to the chamber on opposite sides of the reciprocable member, respectively. First and second exhaust valves are coupled, respectively, to the first and second passages at locations intermediate the associated pressure valve and the chamber and communicating with the first and second vents, respectively. Actuators are drivable by the piston for switching the valves between first and second positions, and the fluid under pressure retains the valves in whichever of the positions they are placed.
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