Heat limiters and method of manufacture

Details Heat limiters and method of manufacture Heat limiters and method of manufacture

1981-12-28

1983-05-10

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337142, 337407, H01H 3776

Patent

active

043832369

ABSTRACT:
A circuit interrupting device responsive to externally generated heat and method of manufacture of such device. The device includes a pair of spaced, coaxially aligned leads each entering a thermally conductive housing from an opposite end. The inserted ends of the coaxially aligned leads are bridged by a conductive member comprising the tail of a conical spring which surrounds one of the leads and is secured at a corresponding end of the housing. The circuit-completing spring tail is secured by fusible material to the inserted ends of each of the spaced-apart leads. In a normal, closed circuit condition, the spring is under tension. Upon heating, the fusible material softens, allowing the spring tail to break away from the inserted ends of the spaced-apart leads, the retracting force of the conical spring, pulling the spring tail from the other one of the leads to open the circuit.

REFERENCES:
patent: 3301981 (1967-01-01), Urani
patent: 4032877 (1977-06-01), McAlister

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