Device and method for locking a rim of a wheel to a turntable

A method for locking a rim of a wheel to a wheel-holder unit equipped with a supporting plate and a hollow rotary shaft having an end portion which projects in a cantilever fashion from the supporting plate wherein the method comprises the following steps:

• preparing a centring cone having a through hole;
• coupling the centring cone to the end portion of the rotary shaft, in such a way that the centring cone is tapered in the same direction to that in which there the end portion of the hollow shaft extends;
• positioning the rim on the supporting plate in such a way that a central hole of the rim is coupled to the centring cone;
• preparing a centring flange having a first face and a second face from which two or more centring rods project in a cantilever fashion;
• inserting centring rods of the centring flange in radial openings of the rim until the second face of the centring flange is in contact with the rim;
• preparing a clamping rod having, at a first end, a locking element and, at a second threaded end, a clamping element coupled thereto;
• inserting the locking element of the clamping rod inside the hollow shaft to prevent a movement of the clamping rod along a first axis of the wheel-holder unit;
• rotating the clamping element to move it along the clamping rod, until it presses on the first face of the centring flange to clamp against the rim.