Thermostatic controller for waterbed heater

H - Electricity – 05 – B

Patent

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309/14

H05B 3/60 (2006.01) A47C 27/08 (2006.01) H01H 37/36 (2006.01) H01H 37/22 (2006.01)

Patent

CA 2004792

ABSTRACT OF THE DISCLOSURE A thermostatic controller for a waterbed heater of the type where the water bladder is enclosed in a foam casing with the controller disposed between the bladder and the side of the casing. The controller has a liquid filled bulb and capillary temperature sensor disposed in a sensing chamber isolated by dead air from a separate walled switching chamber having a diaphragm type actuator connected to the capillary tube for moving a lever spring biased against the actuator and operable to actuate a snap switch. An adjustment camshaft extends externally of the controller housing for adjusting the bias on the lever for changing the temperature at which the snap switch is actuated.

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