Compact linear actuator
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United States of America Patent
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Mar 22, 2016
Grant Date -
Apr 3, 2014
app pub date -
Oct 2, 2012
filing date -
Oct 2, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A fluid-driven linear actuator comprises a piston configured for reciprocating motion in a piston chamber and a spool valve in a valve chamber. The valve chamber is fluidly connected to a fluid input and to a fluid output. The spool valve is configured to be hydraulically moved within the valve chamber between a plurality of spool valve configurations, comprising a first spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a first fluid pressure differential which tends to force the piston in a first axial direction and a second spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a second fluid pressure differential which tends to force the piston in a second axial direction. The actuator also comprises at least one switch valve configured to be switched between a plurality of switch valve configurations and to thereby create one or more differential pressure configurations which hydraulically move the spool valve.
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