Method and apparatus for removing trip hazards in concrete sidewalks

  • US 6,827,074 B2
  • Filed: 05/24/2002
  • Issued: 12/07/2004
  • Est. Priority Date: 05/24/2002
  • Status: Active Grant
First Claim
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1. In combination with a right angled grinder motor having a threaded, rotatable output spindle, an apparatus for making 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 unthreaded blade attachment holes said collar having at least one pair of flattened parallel sides sized to receive a wrench, with which said hub may be tightened onto said threaded output spindle;

    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 said 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 said blade attachment screw, each nut being biased against an upper surface of the flange, thereby securing the blade to the hub.

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