Importance

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Abstract

A rotary device for treating a work surface comprises a generally cylindrical hub body having a closed end wall, an open other end, and a rather serpentine endless peripheral wall formed with smoothly merging cylindrical wall sections, curved wall sections, flat wall sections and inner cylindrical wall sections. The flat wall sections define channels and the inner cylindrical wall sections define sleeves for removably receiving interchangeable springy fingers with cylindrical knuckles at their inner ends in side-by-side array axially of the hub body. Free ends of the springy fingers extend chordally outward from the hub body in directions opposite to the direction of rotation of the hub body. A centrally apertured cover plate closes the open end of the hub body. A bolt extends axially through a central passage in the hub body. The bolt has a keyed head mating nonrotatably with a corresponding keyed end of the central passage to insure insertion of the bolt in correct axial direction in the hub body. A nut engages on the threaded end of the bolt and bears against the cover plate to hold the springy fingers in the hub body. The curved wall sections provide wide bearing surfaces for the springy fingers when they flex upon application to the work surface, and upon release from the work surface as the hub body rotates. The springy fingers can be made of wire which is round, oval or flat in cross section. The nut is reverse threaded to tighten when the device is under load in use. A cylindrical grinding wheel or sandpaper tube having inwardly extending springy fingers can be mounted on the hub body enclosing it, to rotate with the hub body. Hard or soft pads can be applied to the springy fingers for performing different functions.

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First Claim