Patent ID: 6145752
Filing Date: 2000-11-14
Classification: G05D,H01H

Abstract:
A thermostat system for producing a delayed output upon exposure to a temperature change that crosses a thermal limit between defined temperature ranges, the thermostat system comprising:a pair of contacts;a creep action bi-metal thermostat, electrically connected to the pair of contacts, the thermostat providing an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within a defined range, the thermostat interrupting any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range, and an enclosure having a defined three dimensional shape enclosing the thermostat and providing electrical connections between the thermostat and the contacts;a capacitor, electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to prevent heating of the bi-metal caused by arcing when the bi-metal thermostat alters the state of the electrical connection between the contacts; anda cover composed of a material having a thermal conductivity of 10 W/m.degree. C. or less and having an interior surface and an exterior surface confronting the environment being thermally regulated, the cover enveloping the thermostat, to create a thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated, the interior surface of the thermal cover forming a three dimensional surface separated from contiguous contact with the enclosure of the thermostat by spaces between the interior surface of the thermal cover and the enclosure of the thermostat to establish a thermal medium between the thermal cover and the enclosure to control the thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated.