Foot Sanding Disc with a Flat Abrasive Sanding Surface, Smooth Periphery and Slip-On Shaft

Abstract

Afoot sanding disc includes a hub; a concentric abrasive disc having a diameter smaller than the hub diameter. A shaft concentrically attached to the bottom surface of the hub has a free end and a central cavity of a determined shape extending from the free end to a determined depth into the shaft. The shaft is shaped, sized and configured to matingly receive within the cavity a portion of a mandrel attached to an output shaft of a motorized rotary tool, thereby operably coupling the disc to an output shaft of the motarized rotary tool. A circular recess concentrically formed in a top surface of the hub receives the abrasive disc. The abrasive disc is devoid of a central aperture. The hub may include a thermochromic material in a concentration effective to cause a change in color when the hub reaches a predetermined temperature. The hub may also be rigid or flexible.

1 . A foot sanding disc comprising a hub having a top surface, a bottom surface, and a hub diameter, an abrasive disc having a disc diameter smaller than the hub diameter, said abrasive disc being concentrically mounted to the top surface of said hub, and a shaft concentrically attached to the bottom surface of said hub, said shaft having a free end and a central cavity of a determined shape extending from said free end to a determined depth into the shaft, said shaft being configured to matingly receive within said cavity a portion of a mandrel attached to an output shaft of a motorized rotary tool, thereby operably coupling the disc to an output shaft of the motarized rotary tool.  
   
   
       2 . A foot sanding disc according to  claim 1 , said disc further comprising a circular recess concentrically formed in the top surface of the hub, said circular recess being configured to concentrically receive the abrasive disc, and having a circular recess diameter of slightly larger than the disc diameter and smaller than the hub diameter.  
   
   
       3 . A foot sanding disc according to  claim 2 , wherein the abrasive disc has a disc thickness, and the circular recess has a depth approximately the same as the disc thickness.  
   
   
       4 . A foot sanding disc according to  claim 2 , wherein the abrasive disc has a disc thickness, and the circular recess has a depth approximately less than the disc thickness.  
   
   
       5 . A foot sanding disc according to  claim 2 , wherein the circular recess has a planar surface for engaging the abrasive disc, and said abrasive disc is bonded to the planar surface.  
   
   
       6 . A foot sanding disc according to  claim 2 , wherein the abrasive disc is comprised of a substrate coated with an abrasive material, and the abrasive disc is devoid of a central aperture.  
   
   
       7 . A foot sanding disc according to  claim 2 , wherein the circular recess has a planar bottom surface, and said abrasive disc is integrally formed on said planar bottom surface, said abrasive disc being comprised of an abrasive material bonded directly to the planar bottom surface.  
   
   
       8 . A foot sanding disc according to  claim 2 , wherein the central cavity includes a roughened surface.  
   
   
       9 . A foot sanding disc according to  claim 2 , wherein the central cavity includes a tapered configuration.  
   
   
       10 . A foot sanding disc according to  claim 2 , wherein the central cavity has a cross sectional shape and size compatible with the mandrel.  
   
   
       11 . A foot sanding disc according to  claim 10 , wherein the central cavity has a cross section from the group consisting of circular, oval, elliptical, triangular, square, pentagonal or octagonal, and the mandrel has a corresponding cross section.  
   
   
       12 . A foot sanding disc according to  claim 11 , wherein the central cavity is configured manual installation and removal of the foot sanding disc on the mandrel without any tools.  
   
   
       13 . A foot sanding disc according to  claim 2 , wherein the hub and shaft are comprised of material from the group consisting of polyvinyl chloride (PVC), polyethylene, polypropylene, polystyrene, acrylics, cellulosics, acrylonitrile-butadiene-styrene terpolymers, urethanes, thermo-plastic resins, thermo-plastic elastomers (TPE), acetal resins, polyamides, polycarbonates and polyesters.  
   
   
       14 . A foot sanding disc according to  claim 2 , wherein the hub is comprised of a thermochromic material in a concentration effective to cause a change in color when the hub reaches a predetermined temperature.  
   
   
       15 . A foot sanding disc according to  claim 2 , wherein the hub is comprised of a disc from the group consisting of a rigid disc and a flexible disc.