Damper drive in heating appliance or the like

H - Electricity – 05 – B

Patent

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327/2.4, 327/1.7

H05B 6/64 (2006.01) F24C 15/02 (2006.01) F24C 15/32 (2006.01) G05D 23/02 (2006.01) H05B 6/80 (2006.01)

Patent

CA 1213002

ABSTRACT OF THE DISCLOSURE A heating appliance such as a hot-air circula- ting microwave oven has a shape memory alloy as a damper spring for operating a damper controlling the supply of air into a heating chamber. The damper spring is dis- posed in an air path inside a duct for delivering air from a cooling fan to both the heating chamber and a magnetron, so that the damper spring is also cooled.

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