Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1988-08-04
1989-04-18
Broome, H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
374 1, 337365, H01H 3712, H01H 3754
Patent
active
048231053
ABSTRACT:
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.
REFERENCES:
patent: 2627003 (1953-01-01), Porter
patent: 2820870 (1958-01-01), Moksu
Broome H.
Portage Electric Products, Inc.
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