Heat motor operated load regulating switch assembly

Details Heat motor operated load regulating switch assembly Heat motor operated load regulating switch assembly

1997-02-07

1998-12-08

Phillips, Michael W.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With mechanical timing means

337333, 337342, 337380, H01H 3712

Patent

active

058476369

ABSTRACT:
A user adjustable switching controller for duty cycle regulating flow of current to an electrical load such as a resistance heater, particularly for cooking appliances. A load current switch, when closed by a user operated cam also energizes a heat motor which includes a resistive strip attached to one active leg of a U-shaped bi-metal member. The load current switch snap spring is attached to the heated leg of the bi-metal. The other leg of the U-shaped bi-metal is anchored to one of the load connecting stationary terminals and serves to provide ambient temperature compensation. User rotation of the cam deflects a bias spring which acts on the portion of the bi-metal attached to the load switch snap spring to effect closing of the load current switch and energization of the heat motor. Heating of the bi-metal causes warpage which overcomes the bias spring to open the load switch and shut off the heat motor. Cooling of the bi-metal allows the load current switch to re-close repeating the cycle. User adjustment of the cam varies the bias on the snap spring and thus the re-open point of the switch with respect to the cycle, thereby varying the ratio of "on" to "off" time of the load current.

REFERENCES:
patent: 5021762 (1991-06-01), Hetrick
patent: 5191310 (1993-03-01), Obermann et al.
patent: 5696479 (1997-12-01), Oughton et al.

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