Patent ID: 7000606

Claim:
In combination with a right angled grinder motor having a threaded, rotatable output spindle and no provision for water cooling, an apparatus for making chamfer cuts adjacent the edges of concrete slabs, the apparatus comprising: a hub having an attachment collar, a blade mounting flange, and a blade centering shoulder on a lower surface of the flange, said collar, said flange and said shoulder being machined as a unit, said collar having a central mounting aperture that is threaded to spirally engage the output spindle, said flange being equipped with multiple unthreaded blade attachment holes; a generally circular blade having metal matrix edge in which diamond grit is embedded, said blade having a central positioning aperture sized to fit over the blade centering shoulder, said blade also having multiple countersunk holes which align with the blade attachment holes of the flange; multiple blade attachment screws having countersinking heads, each blade attachment screw passing, firstly, through a countersunk hole in the blade so that its countersinking head is flush with a lower surface of the blade and, secondly, through a blade attachment hole; and a nut for threadably engaging each blade attachment screw, each nut being biased against an upper surface of the flange, thereby securing the blade to the hub.