Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1987-09-10
1988-06-14
Broome, H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
337313, 337318, H01H 3736, H01H 3774
Patent
active
047514914
ABSTRACT:
A thermostat for use with an oven of an electric or gas range includes a first electrical contact terminal, a second electrical contact terminal and an actuating assembly including an actuating spring arm for opening and closing an electrical path between the first and second contact terminals. The spring arm has a fixed end mechanically and electrically coupled to the first electrical contact terminal by a movable support member and a free end that moves between a contacting position and a noncontacting position with the second electrical contact terminal. The manually operable mechanism is movable to an OFF position and to a plurality of ON positions for selecting an oven operating temperature. The temperature responsive mechanism is movable in response to changes in oven temperature. A positive-off mechanism maintains the noncontacting position of the spring arm responsive to the manually operated mechanism moved to the OFF position. The positive-off mechanism includes an integral pivotable arm having a pair of legs that are pivoted to engage the free end of the spring arm. The positive-off mechanism is arranged to provide effective and reliable operation and to avoid deformation of the spring arm, thereby extending the useful life of the thermostat.
REFERENCES:
patent: 2889432 (1959-06-01), Miller
patent: 3103567 (1963-09-01), Liebermann et al.
Cors Craig M.
Kadlubowski Joseph C.
Broome H.
Harper-Wyman Company
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