Recorder actuator for communication lines

Details Recorder actuator for communication lines Recorder actuator for communication lines

1977-07-13

1978-09-26

Cardillo, Jr., Raymond F.

H04M 164

Patent

active

041172663

ABSTRACT:
A connection across telephone lines includes a resistor having a shunted capacitor circuit holding a normally closed relay open and permitting it to close on closing the telephone circuit, by lifting the handset, to activate a recorder. Replacing the handset opens the circuit shutting off the recorder. A current limiting resistance in the recorder switch circuit prevents damage to the relay while the capacitor provides high current for activating the the relay solenoid. A bridge circuit eliminates polarity of the magnetically biased relay.

REFERENCES:
patent: 2228673 (1941-01-01), Reeves
patent: 2495769 (1950-01-01), Reeves
patent: 3492427 (1970-01-01), Foster
patent: 3671680 (1972-06-01), Nye et al.
patent: 3712961 (1973-01-01), Nye et al.
patent: 3909538 (1975-09-01), Jacobson
patent: 4017686 (1977-04-01), Todd

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