Rapid response thermal switch for isolated load control

Details Rapid response thermal switch for isolated load control Rapid response thermal switch for isolated load control

1981-04-20

1983-07-05

Reynolds, B. A.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

337105, 337 44, 337101, 219494, 219511, H05B 102

Patent

active

043920500

ABSTRACT:
A rapid response thermal switch for isolated load control includes a bimetallic switch electrically connected to a controller and operatively connected to a switch follower which controls the operation of a second switch electrically connected to a load so that the load is electrically isolated from the controller. While energization of the bimetallic switch by the controller causes the bimetallic switch to move away from its switch follower, the switch follower is biased to follow the bimetallic switch. The initial movement of the switch follower allows the load current controlling switch to close, energizing the load. The bimetallic element, heated by the controller currents flexes to cycle itself on and off while maintaining the load controlling switch in the closed position. When the bimetallic element sufficiently cools after deenergization, it returns the bimetallic switch to its closed position. The load current control switch is quickly opened, when the controller turns off, by the reverse movement of the bimetallic element since the switch follower is always in contact with the bimetallic switch and the bimetallic switch maintains itself in a position to quickly operate the load current controlling switch.

REFERENCES:
patent: 1581714 (1926-04-01), Appelberg
patent: 3735316 (1973-05-01), Thorsteinsson
patent: 3946200 (1976-03-01), Juodikis
patent: 3980420 (1976-09-01), Baysinger

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