Overload protector for a telephone set

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

1984-09-17

1987-04-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361119, 361400, 337239, 337407, H02H 504

Patent

active

046618813

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. On application of an overload, the component heats up to a level at which sufficient heat travels along the leads to melt the solder. Usually both leads become unsoldered. One or both leads part from the conductor pattern under the effect of gravity; under the effect of a compression spring on one or both leads and held in compression between component and circuit board; or a combination of both. A convenient component is a carbon block resistor, in the Tip or Ring line. A heat insulating member can be positioned around the component. The insulating member can be a sleeve loosely fitting over the resistor and retaining heat in the resistor, or a coating or layer directly on the component.

REFERENCES:
patent: 2734150 (1956-02-01), Beck
patent: 4047143 (1977-09-01), Burden
patent: 4379318 (1983-04-01), Ootsuka
patent: 4441093 (1984-04-01), Okazaki
patent: 4553114 (1985-11-01), English

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