Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1977-04-06
1978-07-25
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337380, H01H 3704, H01H 3752
Patent
active
041032713
ABSTRACT:
A thermostat includes a bimetallic snap-action disc for actuating an electrical switch, a stop engaging one edge portion of the disc, a switch contact operating member engaging an opposite disc edge portion, and a fulcrum disposed between the disc edge portions and about which the disc moves whereby to amplify the movement of the disc. The fulcrum is formed by an appropriate shaping of a base wall of a thermostat housing. The switch contacting operating member is arranged to act on a leaf spring mounting a movable switch contact that engages the free end of a tongue formed by a U-shaped slot within the leaf spring whereby to permit overtravel of the disc without causing significant alteration of the disc opening temperature.
REFERENCES:
patent: 2707738 (1955-05-01), Weissheimer et al.
patent: 3577111 (1971-05-01), Nardulli
patent: 3949344 (1976-04-01), Hancock et al.
patent: 4039992 (1977-08-01), Givler
Phillips Richard Antony
Taylor John Crawshaw
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