Double safety thermostat having movable contacts disposed in bot

Details Double safety thermostat having movable contacts disposed in bot Double safety thermostat having movable contacts disposed in bot

1995-06-07

1997-08-19

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With longitudinally expansible solid element

337333, 337337, 337380, H01H 3746

Patent

active

056592850

ABSTRACT:
An object of the present invention is to provide a thermostat including a protection circuit for protecting a circuit even if contacts of the thermostat are welded. Movable contacts are disposed in both ends of a resilient plate deformed by a thermally responsive member and stationary contacts are disposed to correspond to both the movable contacts. External terminals are disposed to correspond to the stationary contacts. The strength of the spring on the side of one movable contact of the resilient member is made weaker than the strength of the spring on the side of the other movable contact. Normally, the movable contact having the weaker strength of the spring is opened and closed in response to the deformation of the thermally responsive member and if this contact are welded, the other movable contact is opened and closed. In the preferred embodiment, the second thermally responsive member for operating one movable contact is provided.

REFERENCES:
patent: 4092624 (1978-05-01), Tomoyoshi et al.
patent: 4470033 (1984-09-01), Hofsass
patent: 4568904 (1986-02-01), Takahashi et al.
patent: 4808965 (1989-02-01), Cenky

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