Spindle for fastening rims of vehicle wheels on repair shop machines
A spindle for fastening rims of vehicle wheels on repair shop machines, which comprises a frame that can be associated rotationally about a working axis with a repair shop machine, six or more movable arms that are associated with the frame, are distributed around the working axis and can rotate about respective rotation axes that lie on a plane that is substantially perpendicular to the working axis, and claws for gripping the rim of a vehicle wheel, which are associated with the arms and on which it is possible to fit the internal cylindrical portion of the rim.
1. A spindle for fastening rims of vehicle wheels on repair shop machines, comprising:
a frame that is connectable for rotation about a working axis to a repair shop machine;
at least six movable arms that are associated with said frame at a first end thereof, so as to be distributed around said working axis, and to be rotatable about respective rotation axes that lie on a plane that is substantially perpendicular to said working axis;
claws for gripping a vehicle wheel rim, which are connected to said arms, and are adapted for fitting thereon an internal cylindrical portion of the wheel rim;
rotation actuation means for rotating said arms with respect to said frame;
wherein said rotation actuation means comprise at least one jack, with a fixed end associated with said frame and a movable end associated with at least one of said arms in a point that is located away from a corresponding one of said rotation axes.
2. The spindle of claim 1 , comprising six of said arms.
3. The spindle of claim 1 , comprising eight of said arms.
4. The spindle of claim 1 , wherein said rotation axes are located substantially equidistant from said working axis, around which said arms are distributed in a circular arrangement.
5. The spindle of claim 1 , wherein said arms are distributed in a circular arrangement around said working axis with a substantially constant pitch.
6. The spindle of claim 1 , wherein said jack is substantially aligned along said working axis.
7. The spindle of claim 1 , wherein said movable end of said at least one jack is provided with a disk, each one of said arms being associated to said disk.
8. The spindle of claim 1 , further comprising turning means for turning each one of said claws with respect to the corresponding arm, about a claw turning axis that is substantially parallel to the corresponding rotation axis, said turning means being adapted to maintain inclination of said claws with respect to said working axis during movement of said arms.
9. The spindle of claim 8 , wherein turning means are of an articulated-parallelogram type.
10. The spindle of claim 8 , wherein said turning means comprise, for each one of said claws, at least one linkage with ends thereof associated respectively with said frame and with said claw, said linkage being rotatable with respect to claw axes that are substantially parallel to the corresponding claw turning axis.
11. The spindle of claim 10 , wherein each of one of said claws comprises a portion that faces said working axis and has a substantially pointed shape.
12. The spindle of claim 11 , wherein projection of said pointed shaped portions on said plane of arrangement of the rotation axes forms substantially an angle of 60° of rotation about said working axis, six of said arms being associated with said frame.
13. The spindle of claim 11 , wherein projection of said pointed shaped portions on said plane of arrangement of the rotation axes forms substantially an angle of 45° of rotation about said working axis, eight of said arms being associated with said frame.