CPC B24C 7/0053 (2013.01) [B24C 5/04 (2013.01); F15B 15/065 (2013.01); F16K 31/1221 (2013.01); F16K 31/1225 (2013.01); F16K 31/535 (2013.01); B02C 4/02 (2013.01); B02C 4/32 (2013.01); B24C 3/06 (2013.01)] | 14 Claims |
1. An actuator configured to couple with a controlled member to move the controlled member between and including a first controlled position and a second controlled position, the actuator comprising:
a. a body defining a first internal chamber, the first internal chamber comprising a first sidewall wall;
b. a first piston comprising a first side and a second side, the first first piston disposed in the first internal chamber and moveable between and including a first position and a second position, the first piston sealingly engaging the first sidewall thereby forming a first chamber on the first side of the first piston and a second chamber on the second side of the first piston;
c. a second internal chamber, the second internal chamber comprising a second sidewall;
d. a second piston comprising a first side and a second side, the second piston disposed in the second internal chamber and moveable between and including a third position and a fourth position, the second piston sealingly engaging the second sidewall thereby forming a third chamber on the first side of the second piston and a fourth chamber on the second side of the second piston, the second piston configured to not engage the first piston when the second piston is disposed at the third position, the second piston configured to move the first piston to the second position as the second piston moves from the third position to the fourth position; and
e. at least one resilient member disposed in the fourth chamber and resiliently urging the second piston toward the fourth position.
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