Secure grinder blade and tapered tool-side locking hub for flush cutting concrete

Abstract

An apparatus may include a grinder blade for flush cutting concrete, the grinder blade comprising: a distal side that defines a flush cutting plane and a proximal side opposite the distal side, and a locking hub receiver section unitarily formed from the grinder blade at a center portion and extending from the grinder blade a proximal direction to receive a locking hub with a plurality of fasteners disposed proximally to the grinder blade to secure the locking hub against the grinder blade.

What is claimed is: 
     
         1 . A method comprising:
 providing a grinder blade with a core material comprising a hard metal or a hard metal alloy for flush cutting concrete, the grinder blade comprising:
 a top side configured to face a grinder to which the grinder blade is attached; 
 an outer edge operable to enable the grinder blade to make a perpendicular cut into a surface of a first section of concrete up to a radial depth of the grinder blade that is proximate to a locking hub receiver section on the top side of the grinder blade, wherein the perpendicular cut is perpendicular relative to the surface of the first section of concrete; and 
 a bottom side opposite of the top side and configured to make flush contact with a second section of concrete that is perpendicularly adjoined to the first section of concrete concurrently with the outer edge making a perpendicular cut into the first section of concrete; and 
   forming the locking hub receiver section extending from a center portion of the grinder blade at an acute angle that aligns with tapered side portions of a locking hub and comprising a plurality of fastener holes configured to align with threaded fastener engaging bores in a plurality of tapered side portions of the locking hub for receiving a plurality of threaded fasteners from the top side of the grinder blade to secure the locking hub against the grinder blade.   
     
     
         2 . The method of  claim 1 , further comprising selecting a geometry for the locking hub receiver section that conforms to a polygonal frustum derived from a regular polygon with from three to eight sides. 
     
     
         3 . The method of  claim 2 , further comprising creating a plurality of slits at the center portion of the grinder blade to form a plurality of tabs corresponding to angled portions of the locking hub receiver section. 
     
     
         4 . The method of  claim 3 , further comprising creating the plurality of fastener holes in two or more of the plurality of tabs that align with threaded holes in angled side portions of the locking hub to receive a plurality of fasteners from the top side of the grinder blade for tightening two or more of the plurality of tabs against the locking hub. 
     
     
         5 . The method of  claim 4 , further comprising bending the plurality of tabs to a tab angle that is configured to substantially conform to a taper angle of the tapered side portions of the locking hub. 
     
     
         6 . The method of  claim 4 , wherein the plurality of fasteners comprise non-countersunk machine screws. 
     
     
         7 . The method of  claim 4 , wherein heads of the plurality of fasteners are selected from star drive, square drive, Phillips drive, and hex drive. 
     
     
         8 . The method of  claim 2 , wherein a geometry of the locking hub comprises a polygonal frustum with from three to eight sides. 
     
     
         9 . The method of  claim 7 , wherein the locking hub comprises a locking hub base for the polygonal frustum wherein a geometry of the locking hub base comprises a non-tapered polygonal extrusion extending from a distal end of the polygonal frustum. 
     
     
         10 . The method of  claim 8 , wherein the geometry of the locking hub comprises a four-sided frustum. 
     
     
         11 . The method of  claim 7 , a taper angle of the polygonal frustum relative to a centerline axis of the polygonal frustum is from about 20 degrees to about 70 degrees. 
     
     
         12 . The method of  claim 2 , wherein the grinder blade comprises one or more cutting surfaces at an outer perimeter comprising diamond particles. 
     
     
         13 . The method of  claim 11 , wherein the grinder blade comprises a segmented rim. 
     
     
         14 . The method of  claim 2 , wherein the grinder blade comprises a plurality of diamond grinding regions. 
     
     
         15 . The method of  claim 14 , wherein the plurality of diamond grinding regions are diamond segments angled in a turbo pattern.