Spring-return, pneumatic actuator
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United States of America Patent
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Apr 20, 2010
Grant Date -
Jan 29, 2009
app pub date -
Aug 3, 2007
filing date -
Aug 4, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spring-return, pneumatic actuator includes a casing having therein a cylinder chamber, a housing chamber and a spring chamber and equipped therein with a piston reciprocating by air supplied and discharged from an air supply and exhaust vent on a primary side of the pistons. A piston rod is joined to the piston, and a conversion mechanism is provided for converting a reciprocating motion of the piston into a rotary motion. A spring undergoes a snap action due to the reciprocating motion of the piston, and a communication space chamber is formed via a communication part to have a predetermined volume from a secondary side to the spring chamber. The cylinder chamber has the piston and the piston rod built-in, the housing chamber has the conversion mechanism built-in and the spring chamber has the spring built-in.
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