Actuator which can be locked when exposed to a high temperature

Details Actuator which can be locked when exposed to a high temperature Actuator which can be locked when exposed to a high temperature

1989-06-09

1991-02-05

Broome, H.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337140, H01H 3722, H01H 3752, H01H 6108, H01H 7118

Patent

active

049908839

ABSTRACT:
An actuator such as an electrical switch which responds to an event such as a change in temperature by movement of an element between first and second positions, for example in which an electrical circuit is open and closed respectively, includes a dimensionally heat-recoverable component which, on recovery when the actuator is exposed to a high temperature, changes configuration so that a portion of the component is positioned between the element while in its first position and a support for the component, so as to restrain movement of the element towards its second position. This allows the actuator to be locked as a result of exposure to the high temperature, which can be desirable, for example, because of damage to equipment to which the actuator is connected.

REFERENCES:
patent: 2114184 (1938-04-01), Hathaway
patent: 4568904 (1986-02-01), Takahashi et al.
patent: 4679023 (1987-07-01), Nelson

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