The present invention regards a tightening group for a rim of or for a tired wheel comprising a base (2), a main wheel-holder or rim-holder plate or table (3) and at least three jaws or jaw or gripper components (5).

An automatic anti-slipping system for a rotationally fixed attachment of a rim of a wheel in a wheel service machine, comprises a wheel supporting and rotating means (20). At least two driving pins (32) are provided at the wheel supporting and rotating means (20) for reversibly generating a rotationally fixed connection between the wheel supporting and rotating means (20) and a rim of a wheel to be serviced, wherein at least one of the at least two driving pins (32) is adapted to come in a positive locking engagement with at least one recess of a rim when coinciding with said recess of a rim by reversibly moving said pins in a direction parallel to the rotary axis of the wheel supporting and rotating with actuator means (40).

The device (1) for locking wheel rims for vehicles on repair workshop machines, particularly tyre-changing machines or the like, comprises fastening means (2) associable in a removable way with supporting means (B) of the rim of a wheel (A) in a vehicle repair workshop machine or the like, a stop element (3) engageable on a rim arranged on the supporting means (B) for locking the rim itself and simultaneous movement means (4) associated with the fastening means (2) and with the stop element (3) and suitable for simultaneously moving the fastening means (2) and the stop element (3) between a release configuration, wherein the fastening means (2) are released from the supporting means (B) and the stop element (3) is substantially disengaged from the rim, and a locking configuration, wherein the fastening means (2) are associated with the supporting means (B) and the stop element (3) is engaged on the rim.

A single-point clamp of four-wheel aligner for vehicles connected to a fixing hub nut on the wheel comprises a sleeve, a single-point variable hexagonal grip, a fastening nut, a connecting board, and a target board with magnets. The single-point variable hexagonal grip and the fastening nut are respectively disposed at two ends of the sleeve. The single-point variable hexagonal grip is firmly lodged in the fixing hub nut. Two ends of the connecting board are respectively connected to the sleeve and the target board. A using method includes steps of: (1) loosening the fastening nut of the single-point clamp; (2) inserting the single-point variable hexagonal grip into the fixing hub nut of the wheel; and (3) rotationally fastening the fastening nut for clamping the fixing hub nut firmly. The single-point clamp and the using method thereof obtain a simple structure, an easy installation, low costs, and a resource-saving effect.