Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1994-09-14
1996-11-12
Picard, Leo P.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337347, 337360, 337365, 337368, 337381, 29622, H01H 3774, H01H 3712, H01H 3754, H01H 1100
Patent
active
055744214
ABSTRACT:
A thermostat includes a case assembly with two terminals and movable contacts, one of which is on a resilient blade to open and close a circuit through the terminals. A bimetal disc actuates the blade by heating to open the contacts. A base defines an interface with the case assembly and supports the disc; the interface being deformed or crushed sufficiently to position the blade to define the threshold temperature and to couple the base and case assembly together. The deformable interface is preferably formed by upstanding, curved projections on the base and mating with the case assembly. When deformed, the projections are substantially perpendicular to the bottom panel of the base so that the disc is centered, but is freely movable. Bendable legs secure a cap in position and lock the case assembly and the base together. In the assembly method, the case assembly and base with the bimetal disc in position are heated to a controlled threshold temperature causing the disc to be bowed prior to pressing the case assembly into the base to deform the interface. The cap is secured locking the case assembly and base together. Additional calibration may be provided by extending the pressing step after the threshold temperature is reached.
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Picard Leo P.
Ryan Stephen T.
Trig, Inc.
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