Base station microphones

Details Base station microphones Base station microphones

1980-08-11

1982-11-30

Brown, Thomas W.

Electricity: circuit makers and breakers

Multiple circuit control

Pivoted contact

179147, 200 5E, 200 18, 200 50C, 200334, 455 78, H01H 902, H01H 926, H01H 1370, H04R 102

Patent

active

043617379

ABSTRACT:
A base station microphone with a transmit bar and a monitor button, the latter being operable to actuate a switch to check for a clear channel before transmitting. The present invention relates to a simple mechanical interlock between the monitor button and the transmit bar, wherein the monitor button must be depressed before the transmit bar may be actuated for transmission. The improved interlock comprises a bell crank lever that has a portion disposed to block depression of the transmit bar. When the monitor button is depressed, the bell crank lever is shifted to move said portion from its blocking position.

REFERENCES:
patent: 1424809 (1922-08-01), Donle
patent: 2557351 (1951-06-01), Jacobson
patent: 2984713 (1961-05-01), Swinehart
patent: 3511951 (1970-05-01), Miller
Burstein-Applebee Catalog No. 641, 1963, p. 50.

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