Triangular abrasive for floor finishing machine

Abstract

A drive plate for a concrete or stone grinding/polishing machine includes one or more abrasive elements in the form of short sintered metal bars having diamond crystals mixed therein. Due to the triangular profile of the abrasive elements, as the drive plate is rotated by a drive motor and the apex of the triangular abrasive element engages the floor surface being treated, the abrasive elements are able to more readily strip off mastic, sealers, glue, or most any thin film topical coating present on concrete or other hard floors.

What is claimed is: 
     
         1 . In a motorized floor finishing machine having at least one circular plate with a central hub projecting out from a first major surface of the circular plate and adapted to be attached to a motor driven drive shaft, the improvement comprising at least one abrasive member comprising a sintered metal bar of a predetermined length and having a triangular cross-section defining a base and an apex opposite said base, where the base is adapted to be joined to a second major surface of the circular plate, said sintered metal bar having diamond particles embedded therein 
     
     
         2 . The motorized floor finishing machine of  claim 1  wherein the predetermined length of the sintered metal bar is in a range of from 0.5 inch to 4.0 inches. 
     
     
         3 . The motorized floor finishing machine of  claim 1  wherein the sintered metal bar has an isosceles triangle cross-section and the included angle of the apex is in a range of from 40 degrees to 90 degrees. 
     
     
         4 . The motorized floor finishing machine of  claim 1  wherein the diamond particles have a grit size in a range of from 16 to 400. 
     
     
         5 . The motorized floor finishing machine of  claim 1  and further including a mounting bracket for interfacing the abrasive member to the second major surface of the circular plate. 
     
     
         6 . The motorized floor finishing machine of  claim 5  wherein the predetermined length of the metal bar is in a range of from 0.5 inch to 4.0 inches. 
     
     
         7 . The motorized floor finishing machine of  claim 5  wherein the metal bar has an isosceles triangle cross-section and the included angle of the apex is in a range of from 40 degrees to 90 degrees. 
     
     
         8 . The motorized floor finishing machine of  claim 5  wherein the diamond particles have a grit size in a range of from 16 to 400. 
     
     
         9 . The motorized floor finishing machine of  claim 5  wherein the base of the abrasive member is affixed to the mounting bracket by one of brazing, welding and soldering.