Multifunction axially movable knob control for channel selection, fine tuning and volume control

Claim 1

A MULTIFUNCTION CONTROL APPARATUS FOR RADIO SIGNAL RECEIVERS COMPRISING: A MOTOR DRIVEN STEP-BY-STEP TUNER HAVING A PLURALITY OF STATION SELECTING POSITIONS, MEANS PROVIDING A CONTROL CIRCUIT FOR SAID MOTOR INCLUDING A SWITCH FOR CAUSING SAID MOTOR TO DRIVE SAID TUNER FROM ONE STATION SELECTING POSITION TO THE NEXT WHEN SAID SWITCH IS ACTUATED, FINE TUNING CONTROL MEANS FOR SAID TUNER, A VOLUME CONTROLLING POTENTIOMETER FOR SAID RECEIVER HAVING A CONTROL MEMBER, A MAIN CONTROL SHAFT MOUNTED FOR ROTATION AND AXIAL MOVEMENT AND BIASED TO A REFERENCE AXIAL POSITION, MEANS COUPLING SAID MAIN CONTROL SHAFT TO SAID VOLUME CONTROLLING POTENTIOMETER CONTROL MEMBER WHEN SAID MAIN CONTROL SHAFT IS IN ITS REFERENCE POSITION WHEREBY ROTATION OF SAID MAIN CONTROL SHAFT CAUSES ROTATION OF SAID VOLUME CONTROLLING POTENTIOMETER CONTROL MEMBER, MEANS MOUNTING SAID SWITCHING FOR ENGAGEMENT WITH AND ACTUATION BY SAID MAIN CONTROL SHAFT WHEN SAID SHAFT IS MANUALLY MOVED AXIALLY IN A FIRST DIRECTION TO CAUSE SAID MOTOR TO DRIVE SAID TUNER FROM ONE CHANNEL SELECTING POSITION TO ANOTHER, AND MEANS POSITIONING SAID FINE TUNING CONTROL MEANS FOR SAID TUNER FOR ENGAGEMENT WITH SAID MAIN CONTROL SHAFT WHEN SAID MAIN CONTROL SHAFT IS MOVED AXIALLY IN A SECOND DIRECTION TO ADJUST THE FINE TUNING OF SAID RECEIVER.