Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1979-05-11
1981-03-31
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337403, H01H 3736
Patent
active
042596564
ABSTRACT:
A thermal cut-off device is disclosed in which a first axial lead extends through an insulating member at one end of the device and a second axial lead contacts and extends through a conductive cylindrical housing at the other end of the device. A domed electrical contact cup is used in one embodiment to make electrical connection between the insulated lead and the outer metallic housing, and this electrical connection is maintained by a coiled helical spring. One end of the coiled spring is larger in diameter than the other end. The large diameter end is in engagement with the end of the conductive housing through which the second axial lead projects, while the smaller end of the conductive spring is in engagement with the insulated first axial lead, either directly or through the domed contact cup. The spring is held in a prestressed condition by a solid thermally fusible or meltable pellet which surrounds the spring, and which holds it in its stressed condition until the predetermined melting, or fusible, temperature of the pellet is reached at which time the stress is relieved in the spring and it contracts away from the insulated first axial lead, so as to break electrical connection between the leads of the device.
REFERENCES:
patent: 672266 (1901-04-01), Gardner
patent: 1199654 (1916-09-01), Bailey
patent: 1685136 (1928-09-01), Montgomery
patent: 2049193 (1936-07-01), Bullen
patent: 4001754 (1977-01-01), Plasko
Bowen Glenn W.
Broome Harold
Buckman Thomas W.
Illinois Tool Works Inc.
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