Hold circuit for telephones

Details Hold circuit for telephones Hold circuit for telephones

1975-02-20

1977-01-04

Claffy, Kathleen H.

179 99, H04M 100

Patent

active

040015203

ABSTRACT:
A hold circuit for telephones which includes a relay having a coil and normally open contacts. A normally open momentary contact switch is connected in series with the relay coil, the series combination being connected across the telephone lines. The contact switch is connected in parallel to the normally open contacts of the relay. The hold circuit captures or holds the telephone lines when the contact switch is closed and permits the telephone lines to be released upon removing the telephone handset "off the hook." In one embodiment, a parallel connection of a lamp and a capacitor is connected in series between the relay contacts and the relay coil to form a voltage divider when the relay contacts are closed.

REFERENCES:
patent: 2306203 (1942-12-01), Anderson
patent: 3725600 (1973-04-01), Hutton
patent: 3733442 (1973-05-01), Lee
patent: 3742151 (1973-06-01), Ruether
patent: 3870831 (1975-03-01), McCarley

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