Chucks and use in processing toroidal structures
View Patent ↗A chuck and a chuck system, and a method for processing a toroidal structure such as a tire carcass. The carcass includes an internal circumference and tapered ends. The chuck system comprises a plurality of chucks wherein each chuck includes a circumferential or substantially circumferential external surface and a plurality of friction reducing members positioned on the external surface. The friction reducing members are positioned to engage the internal circumference of the toroidal structure such as a tire. The method of processing a tire carcass includes positioning the tire carcass on fixed diameter chucks having friction reducing members on the external surface.
1. A chuck system for engaging a tire carcass, the tire carcass having an internal circumference and tapered internal ends, the chuck system comprising:
first and second chucks, each chuck having a non-expandable fixed diameter circumferential external surface defined about a central rotational axis of the chuck system, the chucks and the tire carcass being rotatable about the central rotational axis;
the chucks being co-axially mounted relative to each other and the central rotational axis and being movable axially relative to each other between a retracted position and a separated position; and
each chuck including a plurality of friction reducing members extending radially outward from its non-expandable fixed diameter circumferential external surface for engaging the internal circumference of the tire carcass, the friction reducing members being radially non-expandable relative to the central rotational axis, the friction reducing members being rotatable relative to the external surface of their respective chucks so that friction between the chucks and the tire carcass is reduced during relative axial movement of one or both of the chucks relative to the tire carcass.
2. The chuck system of claim 1 , wherein:
the first and second chucks include first and second tapered sections, respectively, the first and second tapered sections tapering away from each other in axially opposite directions for engaging the tapered internal ends of the tire carcass when the chucks are in their separated position.
3. The chuck system of claim 2 , wherein:
each tapered section has a maximum diameter less than the fixed diameter of the circumferential external surface of its respective chuck, so that a radially extending shoulder is defined on each chuck between its circumferential external surface and its tapered section.
4. The chuck system of claim 1 , wherein:
the plurality of friction reducing members of each chuck are circumferentially equidistantly spaced from each other.
5. The chuck system of claim 1 , wherein:
the friction reducing members extend from the external surfaces of their respective chucks substantially perpendicularly to the axis.
6. The chuck system of claim 1 , wherein:
the friction reducing members are selected from the group consisting of barrel shaped rollers, transfer balls, omni style rollers, ball bearings, spring loaded balls, and combinations thereof.
7. The chuck system of claim 1 , wherein:
the fixed diameter circumferential external surface of each chuck is a cylindrical surface.