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Patent
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H01H 37/12 (2006.01) H01H 37/54 (2006.01)
Patent
CA 1328985
ABSTRACT OF THE DISCLOSURE The present invention provides a method of forming a thermostatic switch having a calibrated operating temperature range that is defined by a calibrated actuation temperature and a calibrated reset temperature. In accordance with this method a snap action thermostatic switch is provided having a bimetal blade with a snap acting depression. The blade is formed to have a range of actuation temperatures above the desired actuation temperature and a range of reset temperatures below the desired reset temperature. The actuation temperature is calibrated in a heated temperature environment that has an initial temperature that is equal to the desired actuation temperature by a fulcrum-like calibration projection. The reset temperature is then calibrated in the heated temperature environment, after the temperature has been lowered to equal the desired reset temperature. In a preferred embodiment, this is accomplished by bending a terminal strip mounting the bimetal blade, towards a fixed contact of the switch while the blade is in a deformed state.
603761
Portage Electric Products Inc.
Seaby & Associates
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