Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1988-09-02
1989-05-09
Broome, H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337113, 337368, H01H 3704, H01H 6108
Patent
active
048292818
ABSTRACT:
The present invention provides an improved means of connecting the end of a bimetal blade, from which the bimetal flexes, to a planar member of a thermostatic switch. The bimetal blade, in response to temperature changes of the ambient, flexes to alternately establish circuit closed and open conditions of the switch. In a preferred embodiment, the planar member is a contact strip that overlies the basewall of a non-conducting case. The attachment provided by the present invention increases the cyclical life expectancy of the bimetal blade by locating a preloaded weld button against the one attached end of the bimetal blade in a press fit wherein a pressure, exerted by the weld button, prevents movement of the bimetal blade. A weld penetrates the planar member, the bimetal blade and the weld button to prevent relaxation of the pressure. In the connection of the present invention, the blade is held in place essentially by the pressure exerted by the weld button rather than by the weld itself.
REFERENCES:
patent: 4755787 (1988-07-01), Wehl
Broome H.
Portage Electric Products, Inc.
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