Texas Instruments Corporation

Ronald W Brown

Youn H Ting

A housing has a switch chamber in which an electric switch is placed and a recess in which is received a snap acting, thermally responsive disc which actuates and deactuates the switch upon snapping from one configuration to another. A thermal biasing assembly used to modify the operating temperature of the disc has a pair of cylindrical film type resistors electrically connected in parallel circuit relation and physically connected to a pair of rivets. Resistors of a rating chosen for a particular application are dropped into the recess with the leads of the resistors received in bores provided in the housing. A rivet is then inserted into each bore making good electrical connection with the leads without welding by deforming them a selected amount. The rivets are attached to suitable terminals and the disc is then placed over the thermal biasing assembly to provide a multiple temperature operating thermostat.

Thermostatic electric switch and thermal biasing assembly therefor

A time delay relay (TDR) is formed by capturing a thermostatic switch between identical shells of an outer housing and suspending the switch in a switch cavity to minimize heat loss to the outer housing. The shells are bonded together to form a unitary housing member. Heater terminal members are captured in identical grooves formed in the housing shells with the terminals projecting from either the top or bottom of the TDR. An alternate embodiment includes a manual reset mechanism also captured between the housing shells.

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Lexington, KY, United States of America

Ronald W Brown