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US 3,952,274 AGranted
Thermally actuatable switch construction
AssigneeMicro Devices Corporation
InventorEmil Robert Plasko
Life of this patent
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AssigneeMicro Devices Corporation
InventorEmil Robert Plasko
Estimating the term…
A thermally actuatable switch having a housing provided with a pair of leads, one of the leads having a contact and the other of the leads having a spring blade for making contact with the contact to complete an electrical circuit between the leads. The spring blade has a normal bias to move the same out of contact with the contact to open the circuit. A temperature sensitive member is carried by the housing and is adapted to collapse when the same is at a predetermined temperature. A biasing member is operatively associated with the temperature sensitive member and the spring blade to resiliently hold the spring blade in contact with the contact as long as the temperature sensitive member is in an uncollapsed condition thereof whereby the biasing member substantially compensates for any shrinkage and/or deterioration of the temperature sensitive member during its uncollapsed life and thus maintains the spring blade in contact with the contact.
A thermally actuatable switch comprising housing means having a pair of lead means, one of said lead means having a contact means, the other of said lead means having a spring blade means for making contact with said contact means to complete an electrical circuit between said lead means, said spring blade means having a normal bias to move the same out of contact with said contact means to open said circuit, a temperature sensitive member carried by said housing means and being adapted to collapse when the same is at a predetermined temperature thereof, and biasing means operatively associated with said temperature sensitive member and said spring blade means to resiliently hold said spring blade means in contact with said contact means as long as said temperature sensitive member is in an uncollapsed condition thereof.
A thermally actuatable switch comprising housing means, first lead means provided with a contact surface and extending into said housing, second lead means extending into said housing for temperature controlled electrical connection with said first lead means, electrically conductive spring blade means in permanent electrical connection with said second lead means and supported for contact with said contact surface but having a normal spring bias urging it away therefrom, and a temperature sensitive member mounted within said housing for urging said spring blade means toward electrical contact with said contact surface when said switch is exposed to temperatures below a predetermined temperature and collapsing to permit movement of said spring blade means away from electrical contact with said contact surface when said switch is exposed to temperatures above said predetermined temperature.
Dependencies are inferred from the claim text.