Multiple control point switching system having automatic access

Claim 2

A switching circuit having a plurality of control stations including in combination: first bistable means having first and second stable states, a first output terminal and first and second control terminals; means for setting said first bistable means to a selected one of said first and second stable states connected to the control terminals thereof; second bistable means having first and second stable states, at least one output terminal and first and second control terminals; means coupling said output terminal of said second bistable means to said control terminals of said first bistable means; means coupling said output terminal of said first bistable means to said control terminals of said second bistable means; means for setting said second bistable means to a selected one of said first and second stable states connected to the control terminals thereof; means connecting said first and second bistable setting means for enabling both bistable means to be set to said first stable state by one of said bistable setting means; and means coupling said output terminals of said first and second bistable means to controllable means for providing energizing signals thereto; whereby energizing signals are selectively applied to said controllable means from one of said first and second bistable means in accordance with the stable states thereof.

Claim 3

A switching circuit as recited in claim 1 wherein one of said bistable means includes a second output terminal and has second controllable means connected thereto to receive energizing signals therefrom.

Claim 4

A switching circuit as recited in claim 2 wherein said controllable means and said second controllable means include oscillators.

Claim 5

A switching circuit as recited in claim 3 wherein said means for setting said first and second bistable means each include switches connected to said control terminals for changing the state of said bistable means and channel selecting switches connecting said first output terminal and said first controllable means for changing the oscillation frequency thereof.

Claim 6

A switching circuit as recited in claim 4 wherein said switching system is used in conjunction with a radio transceiver having a microphone and hang up means therefor, and wherein said setting means each includes switch means attached to said hang up means for switching said bistable means to said first predetermined state for energizing said second controllable means when said microphone is hung up, thereby enabling said transceiver to receive a predetermined frequency signal.

Claim 7

A switching circuit as recited in claim 5 wherein said second bistable setting means is located at a separate control point remotely separated from said first bistable setting means, and wherein said second control point includes microphone hang up means and switch means for setting said second bistable means to said first predetermined state attached thereto.

Claim 8

A switching circuit having a plurality of control stations including in combination: first bistable means having first and second stable states, an output terminal and first and second transistors each having an input terminal for setting said bistable means to one of said stable states; first switch means for causing said first bistable means to change state connected to said input terminals; second bistable means having first and second stable states, an output terminal and first and second transistors each having an input terminal for setting said bistable means to one of the stable states thereof; means coupling said output terminal of said second bistable means to the input terminals of said first and second transistors of said first bistable means; means coupling said output terminal of said first bistable meAns to said input terminals of said first and second transistors of said second bistable means; second switch means for causing said second bistable means to change state connected to said input terminals of said first and second transistors of said second bistable means; means connecting said first and second switch means for enabling both bistable means to be set to the first stable state by one of said bistable setting means; and means coupling said output terminals of said first and second bistable means to controllable means for providing energizing signals thereto; whereby energizing signals are selectively applied to said controllable means from one of said first and second bistable means in accordance with the stable states thereof.

Claim 9

A switching circuit having a plurality of control stations including in combination: first bistable means having first and second stable states, an output terminal and first and second transistors each having an input terminal for setting said bistable means to one of said stable states; first switch means for causing said first bistable means to change state connected to said input terminals; second bistable means having first and second stable states, an output terminal and first and second transistors each having an input terminal for setting said bistable means to one of the stable states thereof; means coupling said output terminal of said second bistable means to the input terminals of said first and second transistors of said first bistable means; means coupling said output terminal of said first bistable meAns to said input terminals of said first and second transistors of said second bistable means; second switch means for causing said second bistable means to change state connected to said input terminals of said first and second transistors of said second bistable means; means connecting said first and second switch means for enabling both bistable means to be set to the first stable state by one of said bistable setting means; and means coupling said output terminals of said first and second bistable means to controllable means for providing energizing signals thereto; whereby energizing signals are selectively applied to said controllable means from one of said first and second bistable means in accordance with the stable states thereof.

Claim 10

A switching circuit as recited in claim 7 wherein each of said switch means includes a first momentary contact switch connected to said first input terminal and a second momentary contact switch connected to said second input terminal.

Claim 11

A switching circuit as recited in claim 8 wherein each of said switch means includes a third switch having an open and a closed position and means for applying a signal indicative of a change in the position of said switch connecting said switch and said first input terminal.

Claim 12

A switching circuit as recited in claim 8 wherein each of said first switches is further connected to said first input terminal of the other bistable means.

Claim 13

A switching circuit as recited in claim 10 wherein each of said coupling means includes a diode pair coupling said input terminals of one of said bistable means to the output terminal of the other of said bistable means.