H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/185
H01H 37/52 (2006.01) H01H 37/28 (2006.01)
Patent
CA 1101026
6D-5075 ABSTRACT Thermostats for use in electrically heated appliances have a positive off position and are adapted for transition to a low temperature on position within a small amount (approximately one radian) of control shaft rotation. The thermostats comprise a stacked blade assembly including a lower bimetal temperature responsive blade, an intermediate stiff spring blade and an upper less stiff flexible spring blade, with the spring blades having juxtaposed switch contacts thereon and the bimetal blade operating to separate the switch contacts when the set temperature is attained. A control bracket mounted above the stacked blade assembly defines an opening through which a control shaft extends, the control shaft butting against the stiff spring blade and positioning it. The shaft mounts a cam and the control bracket has a depending cam follower for the cam, wherein the spring blade urges the cam against the cam follower. The cam has an on/off transition portion which achieves the transition of the thermostat between its positive off position with the switch contacts separated and a low temperature positive on position with the switch contacts together at good contact pressure. In one embodiment the cam further comprises a temperature adjustment portion for adjusting temperature settings above the low temperature on position. In another embodiment the cam is comprised of a cam bushing which threadably receives the control shaft for temperature adjust- ment, and the cam bushing and cam shaft are locked together by clutch surfaces for rotating the cam bushing to achieve the off/on transition.
314629
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