Warning device of overload or overheat for the electric cords, c

Details Warning device of overload or overheat for the electric cords, c Warning device of overload or overheat for the electric cords, c

1997-12-08

1999-12-21

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340653, 340584, 337265, 361 56, 374162, 116207, G08B 2100

Patent

active

060054840

ABSTRACT:
A warning device of overload or overheat for the electric cords, cables, sockets comprisng with a, or some warning strips having evident colors at proper location on a PVC power cord, and having heat-sensing layers applied on the warning strips, whereby, when the power cord is overloaded with a large current, the copper wire thereof is gradually heated, and temperature on the PVC power cord is raised accordingly, then the dark heat-sensing layers become transparent gradually, and the colors of the sensing strips appear, so that an effect of detecting whether the electric cord is in overload, or overheat can be achieved.

REFERENCES:
patent: 3877411 (1975-04-01), MacDonald
patent: 4016762 (1977-04-01), Payne
patent: 4170190 (1979-10-01), Warner
patent: 4325254 (1982-04-01), Svacina et al.
patent: 4459046 (1984-07-01), Spirg
patent: 4907118 (1990-03-01), Hames
patent: 5076708 (1991-12-01), Pierson

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