Self-calibrating assembly method for snap disc Thermostat

Metal working – Method of mechanical manufacture – Electrical device making

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29593, H01H 1100

Patent

active

057584079

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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