Grinding wheel and wheel hub therefore

Abstract

A grinding wheel hub is provided for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture. A grinding face fastener is disposed on the aperture bushing and is adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. The backing flange has a bond surface adapted to face the backing face. The bond surface includes one or more recesses formed therein. Preferably, the recesses have a radial and/or concentric orientation with respect to the center of the aperture bushing. These recesses are sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the backing flange is engaged with the backing face. These cavities are adapted to receive a bonding agent therein to bond the grinding wheel hub to the abrasive grinding wheel. The backing flange has a diameter which allows it to terminate in the sloped region of the grinding wheel between the outermost circumference of the substantially flat depressed center and the substantially flat grinding wheel portion.

1 . A grinding wheel hub for mounting an abrasive grinding wheel having a depressed center on a grinding apparatus, the abrasive grinding wheel having a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel, the grinding wheel having three sections including a substantially flat depressed center section, a substantially flat grinding wheel section, and a sloped transition section therebetween, the substantially flat, depressed center having a mounting aperture disposed centrally within the depressed center, said grinding wheel hub comprising:
 an aperture bushing of substantially cylindrical configuration adapted for coaxial extension through and engagement with the surface of the mounting aperture;   a grinding face fastener disposed on said aperture bushing and adapted to engage the grinding face of the wheel;   a backing flange extending substantially radially outward from said aperture bushing, and adapted for superposed alignment with the backing face, said backing flange terminating at a lip and, said backing flange having a substantially concave surface adapted to face the backing face; and   wherein said lip of said backing flange is adapted to terminate along the backing face of the wheel proximate the sloped transition section such that said backing flange will terminate within said sloped transition section between the outermost circumference of the flat depressed center and the substantially flat grinding wheel section.   
   
   
       2 . The grinding wheel hub as set forth in  claim 1 , wherein:
 the backing flange has a bond surface adapted to face the backing face; and   said bond surface is sized and shaped to provide a cavity between said backing flange and the backing face of the grinding wheel when said backing flange is engaged with the backing face, the cavity being adapted for receipt of a bonding agent therein to bond said grinding wheel hub to the abrasive grinding wheel.   
   
   
       3 . The grinding wheel hub as set forth in  claim 1 , wherein said grinding face fastener comprises a grinding face end of said aperture bushing, said grinding face end adapted for being flanged radially outward from the mounting aperture to engage the grinding face. 
   
   
       4 . The grinding wheel hub as set forth in  claim 1 , wherein said lip is adapted to be spaced from the sloped transition section so as to form a gap. 
   
   
       5 . The grinding wheel hub as set forth in  claim 4 , wherein said backing flange and said lip define said substantially concave surface. 
   
   
       6 . The grinding wheel hub as set forth in  claim 5 , wherein the cavity is defined by a recess in said aperture bushing member, in combination with the backing face of the abrasive grinding wheel. 
   
   
       7 . The grinding wheel hub as set forth in  claim 6 , wherein said recess has an annular shape. 
   
   
       8 . The grinding wheel hub as set forth in  claim 2 , wherein adhesive is disposed within the cavity to bond the grinding wheel hub to the abrasive grinding wheel. 
   
   
       9 . The grinding wheel hub as set forth in  claim 2 , wherein said flange further comprises a plurality of surface irregularities adapted to provide a textured surface area for engagement with the adhesive. 
   
   
       10 . The grinding wheel hub as set forth in  claim 9 , wherein said plurality of surface irregularities comprises a plurality of grooves extending radially from said aperture. 
   
   
       11 . The grinding wheel hub as set forth in  claim 1 , wherein the abrasive grinding wheel comprises an ANSI Type 27 or Type 28 wheel. 
   
   
       12 . The grinding wheel hub as set forth in  claim 8 , wherein the adhesive is an epoxy resin. 
   
   
       13 . The grinding wheel hub as set forth in  claim 1 , including at least one key extending from said backing flange. 
   
   
       14 . A grinding wheel assembly adapted for being mounted on a grinding apparatus, comprising:
 an abrasive grinding wheel having three sections including a substantially flat depressed center section, a substantially flat grinding wheel section and a sloped transition section therebetween, the depressed center having a mounting aperture disposed centrally therewithin, and a grinding face and a backing face disposed on opposite sides of the abrasive wheel;   the grinding wheel hub of  claim 1 ; and   a bonding agent between the backing face and the wheel hub.   
   
   
       15 . The grinding wheel assembly as set forth in  claim 14 , including:
 at least one key extending from the grinding wheel hub; and   at least one mating keyway in the depressed center section of the grinding wheel for mechanically interlocking with the key and preventing rotation between the hub and the grinding wheel.   
   
   
       16 . The grinding wheel assembly as set forth in  claim 14 , wherein said lip is adapted to be spaced from the sloped transition section so as to form a gap.