Patent ID: 7201644

Claim:
In combination with a right angled grinder motor having a threaded, rotatable output spindle and no provision for water cooling of a device attached to the output spindle, an apparatus for making dry chamfer cuts on 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 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; and multiple blade attachment screws having countersinking heads, said countersinking heads being flush with a lower surface of the blade when the blade is secured to the flange with said screws.