Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1980-01-16
1983-03-15
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337 53, H01H 7116
Patent
active
043769250
ABSTRACT:
A switch unit for an electric immersion heater for mounting on the wall of a liquid heating vessel, the switch unit including thermally responsive means sensitive to boiling liquid on a body of the switch unit in a position for exposure to vapor emerging from the vessel, the thermally responsive means comprising a snap-acting bimetallic actuator. An overcenter spring mechanism couples the bimetallic actuator to a movable contact of an electrical switch for opening and closing the switch, the overcenter spring mechanism being movable between a first position in which the switch is closed and power can be supplied to the immersion heater and a second position in which said switch is open for interrupting the supply of power to the immersion heater. A lever of the overcenter mechanism is pivotally mounted on the body and a spring of the overcenter mechanism is mounted between fulcrums provided by the lever and the body so that the spring biasses the lever into direct or indirect engagement with the bimetallic actuator in the first position of the overcenter mechanism.
REFERENCES:
patent: 2801325 (1957-07-01), Pearce
patent: 3305655 (1967-02-01), Marcoux
patent: 3569888 (1971-03-01), Taylor
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