| 摘要 |
A hub structure for a rotary finishing wheel having a rotational axis and being adapted for replaceably mounting a plurality of circumferentially-spaced pack units each of which includes a flap-like member of fill material having a radially outer finishing portion for engaging a workpiece and a radially inner slot-engaging portion for mounting the pack unit. The hub structure includes a plurality of substantially identical hub sections which may be fitted together to form a generally cylindrical hub wall whose outer surface is provided with a plurality of integrally formed, circumferentially-spaced, quasi-cylindrical, key-hole-type slot formations each having a longitudinal slot axis parallel to the rotational axis. Each slot is adapted to telescopically and replaceably receive the slot-engaging portion of a flap-like member for mounting the pack units for limited hinge-type pivotal movement about the slot axis. Plate members, slot plugs or bolt-like, slot-engaging elements are used to axially retain the slot-engaging portions within the slots.
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