Tuning control system for radio receivers

Claim 1

A MANUAL CONTROL SYSTEM COMPRISING: A FIRST UTILIZATION MEANS RESPONSIVE TO ROTARY MOTION, A SECOND UTILIZATION MEANS RESPONSIVE TO LINEAR MOTION, A FIRST ROTATABLE MOUNTED SHAFT COUPLED WITH SAID FIRST UTILIZATION MEANS, A SECOND AXIALLY MOVABLE SHAFT COUPLED WITH SAID SECOND UTILIZATION MEANS, STOP MEANS ON SAID SECOND SHAFT, SPRING MEANS COUPLED WITH SAID SECOND SHAFT TO BIAS SAID SECOND SHAFT AXIALLY IN ONE DIRECTION, MOVABLE LOCKING MEANS INCLUDING A STOP PORTION SO THAT SAID STOP PORTION IS IN THE PATH OF AXIAL MOVEMENT OF SAID STOP MEANS, SAID LOCKING MEANS INCLUDING A CAM SURFACE WHICH IS ENGAGED BY SAID STOP MEANS WHEN SAID SECOND SHAFT IS AXIALLY MOVED IN THE OPPOSITE DIRECTION TO ALIGN SAID STOP PORTION IN THE PATH OF AXIAL MOVEMENT OF SAID STOP MEANS, TO PREVENT AXIAL MOVEMENT OF SAID SECOND SHAFT IN SAID ONE DIRECTION, AND MEANS COUPLING SAID FIRST AND SECOND SHAFTS FOR ROTATION TOGETHER WHEREBY ROTATION OF SAID SECOND SHAFT MOVES SAID STOP MEANS OUT OF ENGAGEMENT WITH SAID STOP PORTION TO RELEASE SAID SECOND SHAFT.