Patent ID: 8453702

Claim:
A blocking device ( 10 ) of a wheel rim ( 100 ) on a centrally-holed rotating wheel-rim support plate ( 5 ) of a tyre-mounting machine, the blocking device ( 10 ) comprising: a stem ( 11 ) configured to be engaged in a central hole ( 6 ) of the plate ( 5 ), a cursor ( 15 ) comprising a conical centring body ( 16 ) being slidably mounted on the stem ( 11 ), a collar ( 20 ) for moving the cursor ( 15 ) along the stem ( 11 ), and a motor ( 28 ) directly fixed to the cursor ( 15 ), and mechanically connected to the collar ( 20 ) to move the collar axially along the stem, the cursor ( 15 ) being prevented from rotating on the stem ( 11 ).