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: (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.

An apparatus as well as a method for painting of a rim or another rotational symmetric item is provided. The apparatus includes: a coating unit with a robot arm and one or more spray nozzles for applying a curable fluid, an item holder equipped with assembly bodies for disengageable securing of the item with the purpose of rotating it, coinciding with the item's center axis, during the coating with the curable fluid, a suspension bracket wherein the item holder is assembled, and which rotates the item holder around a pivot point, which runs perpendicularly on the axis of rotation, coinciding with a diameter through the item and to angle the item holder, as the item is being rotated, a curing unit, and a controller configured to positioning the coating unit in relation to the item for applying the fluid onto the item in accordance with a predetermined coating pattern.

An apparatus as well as a method for painting of a rim or another rotational symmetric item is provided. The apparatus includes: a coating unit with a robot arm and one or more spray nozzles for applying a curable fluid, an item holder equipped with assembly bodies for disengageable securing of the item with the purpose of rotating it, coinciding with the item's center axis, during the coating with the curable fluid, a suspension bracket wherein the item holder is assembled, and which rotates the item holder around a pivot point, which runs perpendicularly on the axis of rotation, coinciding with a diameter through the item and to angle the item holder, as the item is being rotated, a curing unit, and a controller configured to positioning the coating unit in relation to the item for applying the fluid onto the item in accordance with a predetermined coating pattern.

A jaw (1) for clamping a wheel rim comprises a body (2) extending along a longitudinal orientation (L). The body (2) includes: a connecting portion (22) configured to be connected to the head of the wheel-holder unit; a base portion (21) extending along the longitudinal orientation (L); a first abutment wall (23) extending from the base portion (21) along a clamping orientation (R); a second abutment wall (24) extending from the base portion (21) along the clamping orientation (R) in a spacing-apart direction (VA) and longitudinally spaced from the first abutment wall (23) by a working distance (DL); an abutment surface (251), longitudinally interposed between the first abutment surface (23) and the second abutment surface (24) and including a first portion (251A) and a second portion (251B, 251C), disposed at an advanced position relative to the first portion (251A) in the spacing-apart direction (VA) of the clamping orientation (R) to come into contact with the wheel rim. The second portion is spaced from the first abutment wall (23) along the longitudinal orientation (L) by a first abutment distance (D1), greater than 30% of the working distance (DL).

A jaw (1) for clamping a wheel rim comprises a body (2) extending along a longitudinal orientation (L). The body (2) includes: a connecting portion (22) configured to be connected to the head of the wheel-holder unit; a base portion (21) extending along the longitudinal orientation (L); a first abutment wall (23) extending from the base portion (21) along a clamping orientation (R); a second abutment wall (24) extending from the base portion (21) along the clamping orientation (R) in a spacing-apart direction (VA) and longitudinally spaced from the first abutment wall (23) by a working distance (DL); an abutment surface (251), longitudinally interposed between the first abutment surface (23) and the second abutment surface (24) and including a first portion (251A) and a second portion (251B, 251C), disposed at an advanced position relative to the first portion (251A) in the spacing-apart direction (VA) of the clamping orientation (R) to come into contact with the wheel rim. The second portion is spaced from the first abutment wall (23) along the longitudinal orientation (L) by a first abutment distance (D1), greater than 30% of the working distance (DL).