Patent ID: 7223926

Claim:
Apparatus for operating the switch of a radio, comprising: a position control element which is fixed relative to the rotating stem of the switch of a radio, said position control element having a longitudinal axis and being formed with a circumferentially extending track, said track having a height dimension measured in an axial direction generally parallel to said longitudinal axis, a first section of said track having a first height dimension and a second section of said track having a second height dimension which is greater than said first height dimension; a first stop and a second stop each located within said second section of said track and being circumferentially spaced from one another; a knob adapted to be coupled to the stem of the switch, said knob being rotatable relative to said position control element in a circumferential direction and being movable in an axial direction between a first axial position and a second axial position, said knob having a pin which is movable along said first section of said track with said knob in said first axial position, said knob being prevented from movement into said second section of said track by contact of said pin with either of said first and second stops while said knob is in said first axial position, said pin avoiding contact with said first or second stop upon movement of said knob to said second axial position thus allowing said knob to rotate into said second section of said track, whereby said knob is adapted to move said switch to selected positions with said pin located within said first section of said track and to other selected positions with said pin located within said second section of said track.