Overload protector for a telephone set

Details Overload protector for a telephone set Overload protector for a telephone set

1983-03-30

1984-12-04

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

337239, 337407, 361119, H02H 504

Patent

active

044868049

ABSTRACT:
An overload protector for a telephone set or other telecommunications terminal comprises an electrical component having DC continuity and DC resistance mounted by leads on a circuit board, the leads soldered to the conductor pattern. A compression spring is positioned on each lead, held in compression between component and circuit board. An insulating member fits around the component. In application of an overload, the component heats up to a level at which sufficient heat travels down the leads to melt the solder. Usually both leads become unsoldered. A convenient component is a carbon block resistor, in the Tip or Ring line. The insulating member would be a sleeve loosely fitting over the resistor and retaining heat in the resistor.

REFERENCES:
patent: 4047143 (1977-09-01), Burden et al.
patent: 4379318 (1983-04-01), Ootsuka

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