Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With longitudinally expansible solid element
Patent
1975-01-10
1976-06-29
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With longitudinally expansible solid element
337140, H01H 7122
Patent
active
039672271
ABSTRACT:
An actuator system for use in an electrical relay or the like. An actuator member is carried by a frame and is movable between a first and a second position, being biased toward its first position by a spring and having an actuating wire coupled between it and the frame. This wire is stretched from its original length to a second length by the spring when the actuator member is in its first position. The wire is of a selected metal alloy which, upon being heated, shortens its length and thus causes the tension in the wire to increase an amount sufficient to overcome the bias of the spring and to move the actuator member towards its second position. The actuator system further includes selectively operable heating means for the wire and an ambient temperature compensator for insuring that upon operation of the heating means, the wire is sufficiently heated to effect movement of the actuating member from its first to its second position and for preventing the wire from being overstressed, regardless of changes in ambient temperature within a limited range.
REFERENCES:
patent: 2486714 (1949-11-01), Koci
patent: 3218411 (1965-11-01), Silberg
patent: 3634803 (1972-01-01), Willson et al.
patent: 3652969 (1972-03-01), Willson et al.
patent: 3858141 (1974-12-01), Lackey
Clark Joel P.
Clarke David E.
Lackey Robert P.
Baumann Russell E.
Broome Harold
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
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