Thermally responsive controller and switch assembly therefor

Details Thermally responsive controller and switch assembly therefor Thermally responsive controller and switch assembly therefor

1982-12-13

1985-06-25

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

200283, 337340, H01H 3752

Patent

active

045256977

ABSTRACT:
A thermostat having a low force output, snap-acting thermally responsive bi-metal disc operative through a pushrod to move the blade of an SPDT switch at a pre-selected temperature. The switch has a cantilever blade formed of a unitary thin metal strip having a flexible stem with a first rigid tongue extending therefrom with a heavy current carrying moveable contact thereon for a normally closed contact set. The pushrod contacts the rigid first tongue for switch actuation. A second flexible tongue extends from the stem and has an integral low current normally open contact thereon for a contact set which is closed upon switch blade actuation. Upon further temperature rise, after switch actuation, pushrod over-travel on the first tongue is absorbed by resilient flexing of the stem and second tongue thereby providing a wiping action to the closed low current contact set.

REFERENCES:
patent: 3719788 (1973-03-01), Holland et al.
patent: 4091354 (1978-05-01), Deubel et al.
patent: 4103271 (1978-07-01), Taylor et al.
patent: 4220835 (1980-09-01), Storz et al.
patent: 4339738 (1982-07-01), Colavecchio

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