Solenoid circuit for pushbutton release in telephones

Details Solenoid circuit for pushbutton release in telephones Solenoid circuit for pushbutton release in telephones

1975-12-08

1977-09-20

Claffy, Kathleen H.

179 1HS, H04M 108

Patent

active

040499251

ABSTRACT:
In a telephone unit having a plurality of line selection pushbuttons, normally released on replacement of the handset, an additional release switch is provided with associated circuitry, whereby when a speaker unit or "hands free" unit is attached, pushbuttons can be actuated by a solenoid, even though the handset is not removed. The normal hold button is altered to a momentary button, and the solenoid releases all depressed pushbuttons. An additional circuit is provided for preventing actuation of the solenoid and release of an actuated pushbutton on cessation of a call when an answering service module is connected.

REFERENCES:
patent: 2199686 (1940-05-01), Beyland
patent: 2802904 (1957-08-01), Lehr et al.
patent: 3601559 (1971-08-01), Hineline
patent: 3903070 (1975-09-01), Kunimine

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