Control device having a coiled compression shape memory spring,

Details Control device having a coiled compression shape memory spring, Control device having a coiled compression shape memory spring,

1990-04-06

1991-05-14

Tapolcai, William E.

Refrigeration

Automatic control

Of external fluid or means

236 68B, 236101D, 251 11, F25D 1706

Patent

active

050145207

ABSTRACT:
A control device, refrigerator system utilizing the control device and methods of making the same are provided, the control device comprising a housing having a valve seat and having an inlet and an outlet interconnected together by the valve seat, a movable valve member carried by the housing and being adapted to open and close the valve seat by being respectively moved to an open position thereof and a closed position thereof, a coiled compression shape memory spring carried by the housing and being operatively interconnected to the valve member to move the valve member to one of the positions thereof by the spring axially expanding from a closed coil bound condition thereof upon the spring sensing a temperature above a first temperature and to move the valve member to the other of the positions thereof by the spring axially contracting into the closed coil bound condition thereof upon the spring sensing a temperature below a second temperature, and an electrically operated heater having at least a portion thereof disposed within the coils of the spring when the spring is in the closed coil bound condition thereof so as to heat the spring to a temperature above the first temperature when the heater has been energized for a certain time period.

REFERENCES:
patent: 3335997 (1967-08-01), Sherwood
patent: 4284235 (1981-08-01), Diermayer et al.
patent: 4324745 (1982-04-01), Kono et al.
patent: 4523605 (1985-06-01), Ohkata
patent: 4530216 (1985-07-01), Sepso
patent: 4819442 (1989-04-01), Sepso et al.
patent: 4836496 (1989-06-01), Abujudom et al.

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