Thermal switch

Details Thermal switch Thermal switch

1982-08-18

1984-09-04

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337348, 337365, H01H 3774

Patent

active

044700334

ABSTRACT:
Known thermal switches designed for safeguarding apparatus against overheating have been produced with one driving bimetal snap action disk and a spring snap action disk responsible for the contacting force on the turned-on position of the switch. For operation of the switch the bimetal snap action disks have to be powerful enough for overcoming the full contact-making pressure of the spring snap action disk and to this end it is necessary for the bimetal disk to be made quite large in size or the contact-making forces produced thereby will be so low that the conduction and switching properties are poor.
For taking care of this shortcoming of the prior art in the invention a thermal switch has two formed spring snap action disks acting in opposite directions. This makes possible the use of small bimetal snap action disks which nevertheless give high contact-making forces and troublefree operation of such a thermal switch.

REFERENCES:
patent: 2644873 (1953-07-01), Vroom et al.
patent: 4117443 (1978-09-01), Hofsass
patent: 4325047 (1982-04-01), Inada et al.

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