Patent ID: 7013752

Claim:
Rotatable knob for the fixation of an apparatus support in a housing by means of an apparatus having a spindle, said rotatable knob having a knob shell ( 1 ), a coupling part ( 2 ) for the connection of the knob shell to the spindle, a sleeve ( 3 ) which is connectable to the housing, a cover disc ( 4 ) which is secured to the housing by the sleeve ( 3 ), a screw ( 5 ) arranged in the base ( 13 ) of the shell for the setting of the holding force and a clamping disc ( 6 ) which cooperates with the knob shell ( 1 ) and the sleeve ( 3 ) so that, on rotation of the knob shell ( 1 ), the clamping disc ( 6 ) executes a relative movement and can be brought into engagement with the screw ( 5 ) to restrict the rotation of the knob shell ( 1 ), characterized in that the clamping disc ( 6 ) is guided in the knob shell ( 1 ) and rotatably arranged on the sleeve ( 3 ) so that, on rotation of the knob shell ( 1 ), the clamping disc ( 6 ) executes a synchronous rotary movement with the knob shell ( 1 ) and a linear movement with respect to the knob shell ( 1 ).