Grinding Assemblies for use with Handheld Power Tools

Abstract

Grinding assemblies for use with handheld power tools are disclosed herein. More specifically, the assemblies disclosed herein can include a hub, disc, grinding surface and locking nut and can be used with most available handheld grinders for grinding flat surfaces.

1 . A grinding assembly for attachment to a rotating spindle on a handheld power tool, comprising:
 a hub having a vertically traversing channel opening to a topside and underside of said hub and configured to attach to said rotating spindle, and wherein said underside of the hub includes a concave recess;   a disc having a substantially planar topside and underside surrounding a concavo-convex frustum having an aperture and configured to conform to said concave recess on the underside of the hub, such that said aperture aligns with the underside opening of the hub;   and a locking nut having a top-opening hollowed shaft connected to a base having a solid back, wherein said shaft is configured to fit through the disc aperture and the underside opening of the hub to attach to said rotating spindle such that the back of the locking nut is within the concave recess of the hub and does not protrude past the substantially planar underside of the disc.   
   
   
       2 . The grinding assembly of  claim 1 , further comprising a grinding surface configured to be attached to said disc. 
   
   
       3 . The grinding assembly of  claim 2 , wherein said grinding surface is attached to said disc by said locking nut. 
   
   
       4 . The grinding assembly of  claim 1 , wherein the hub includes a plurality of grooves around an outer surface. 
   
   
       5 . The grinding assembly of  claim 4 , wherein the hub comprises bean- shaped grooves on said outer surface. 
   
   
       6 . The grinding assembly of  claim 1 , wherein said concavo-convex frustum comprises a plurality of slots around said aperture. 
   
   
       7 . The grinding assembly of  claim 1 , wherein said vertically traversing channel in said hub, is partially threaded at a thread count of 11 threads per inch. 
   
   
       8 . The grinding assembly of  claim 1 , wherein the underside of the hub includes a flat outer periphery. 
   
   
       9 . A hub for attachment to a rotating spindle on a handheld power tool, comprising a stem connected to a base having a concave recessed underside, wherein a central aperture configured to attach to said spindle vertically traverses from a topside opening of said stem and opens to the underside of the base, and wherein said base includes a plurality of grooves on an outer surface. 
   
   
       10 . The hub of  claim 9 , wherein said base is shaped as a truncated cone. 
   
   
       11 . The hub of  claim 9 , wherein the aperture is threaded. 
   
   
       12 . The hub of  claim 11 , wherein said aperture comprises a thread count of 11 per inch. 
   
   
       13 . The hub of  claim 9 , wherein said plurality of grooves are bean-shaped. 
   
   
       14 . The hub of  claim 9 , wherein said underside comprises a substantially flat outer periphery that surrounds said concave recess. 
   
   
       15 . An assembly for attachment to a rotating spindle on a handheld power tool, comprising:
 a hub having a vertically traversing aperture opening to a topside and underside of said hub and configured to attach to said rotating spindle, and wherein said underside of the hub includes a concave recess; and   a locking nut comprising a back end and a shaft, wherein said shaft is configured to fit through the underside opening of the hub to attach to said rotating spindle such that the back end of the locking nut fits within the concave recess of the hub.   
   
   
       16 . The assembly of  claim 15 , wherein said back end of the locking nut comprises a solid back. 
   
   
       17 . The assembly of  claim 15 , wherein said vertically traversing aperture and said rotating spindle are threaded such that said hub can be screwed onto said rotating spindle. 
   
   
       18 . The assembly of  claim 17 , wherein said vertically traversing aperture includes a top section that is threaded such that said hub can be screwed onto said rotating spindle and a smooth bottom section configured to receive said shaft of the locking nut. 
   
   
       19 . The assembly of  claim 15 , wherein said hub includes a stem and a base in the shape of a truncated cone. 
   
   
       20 . The assembly of  claim 18 , wherein said base includes a flat surfaced underside.