Overtemperature detection cable

Details Overtemperature detection cable Overtemperature detection cable

1980-02-04

1983-08-23

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337416, H01H 3776

Patent

active

044006802

ABSTRACT:
An overtemperature detection cable for use with a fire alarm system, a fire extinguishing system or the like comprises a coaxial assembly of an inner spring wire conductor in a core of thermoplastic dielectric material within an electrically conductive outer sheath. In one embodiment, the spring wire is initially coiled in a three-dimensional helical configuration, is thereafter uncoiled to approximate a straight wire, and is then disposed within the outer sheath to reside in the thermoplastic dielectric core. In a second embodiment, a straight inner spring wire and its surrounding thermoplastic dielectric core reside within an outer sheath, and the assembled sheath, wire, and thermoplastic dielectric material are then bent or crimped to assume a two-dimensional sinusoidal configuration. In both embodiments, when exposed to a predetermined excessive temperature, the thermoplastic dielectric material softens, permitting the inner spring wire conductor to contact the outer sheath and complete an electrical circuit in the associated system.

REFERENCES:
patent: 672266 (1901-04-01), Gardner
patent: 2542889 (1951-02-01), Baertl
patent: 4134092 (1979-01-01), Lavigne
patent: 4237513 (1980-12-01), Foldes

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