Bimetal controlled snap disc thermal switch

Details Bimetal controlled snap disc thermal switch Bimetal controlled snap disc thermal switch

1984-02-08

1985-07-09

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337342, H01H 3752

Patent

active

045285411

ABSTRACT:
In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including: a support plate arranged to be in thermal communication with the member; a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature; a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact; a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc; a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and a compression spring bearing against the transfer member for maintaining the transfer member in operative association with the snap disc, the compression spring is made integral with the contact spring and is in the form of a tongue cut out of the contact spring body.

REFERENCES:
patent: 3322915 (1967-05-01), Johnson
patent: 4278855 (1981-07-01), Rossi

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