Compact actuator

Details Compact actuator Compact actuator

2007-07-03

2007-07-03

Nguyen, Hoang (Department: 3748)

Power plants

Fluid within expansible chamber heated or cooled

Having means within the working chamber to effect the...

C060S515000, C060S530000

Reexamination Certificate

active

11563767

ABSTRACT:
A compact electrothermal actuator includes a housing having a longitudinal axis. A slot extends through the housing. A chamber within the housing contains a working fluid that changes phase upon heating. A piston is slidably disposed within the housing and movable along the longitudinal axis between first and second positions. A spring biases the piston toward the first position. The piston slides from the first position to the second position in response to heating of the working fluid. The piston includes a guide pin extending transverse to the longitudinal axis and protruding into the slot. The slot may be linear or helical for sliding of the piston between the first and second positions without or with rotation of the piston. The length of the actuator, measured along the longitudinal axis, is constant, independent of the position of the piston within the housing.

REFERENCES:
patent: 2699072 (1955-01-01), Wrinkle
patent: 4442670 (1984-04-01), Goldman
patent: 4759189 (1988-07-01), Stropkay et al.
patent: 4887429 (1989-12-01), Birli, Sr. et al.
patent: 5203171 (1993-04-01), Petot et al.
patent: 6332318 (2001-12-01), Thorn

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