Composite abrasive attachment article for concrete power trowel machine

Abstract

The invention provides a float trowel blade attachment for cement floor finishers comprising a rectangular section of sheet metal having a top surface and a bottom surface and having its edges optionally bent upwardly, means for providing to the top surface a three-sided rearwardly open pocket on the back of the section adjacent the leading edge thereof adapted to partially receive a finish trowel blade of the finisher, a spring clip secured to the top surface or the pocket-forming means and extending rearwardly therefrom so as to be engageable with the finish trowel blade to retain the section thereon, and wherein said rectangular sheet metal has attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element bonded to a resilient backing.

What is claimed is: 
     
         1 . A float trowel blade attachment for cement floor finishers comprising a rectangular section of sheet metal having a top surface and a bottom surface and having its edges optionally bent upwardly, means for providing to the top surface a three-sided rearwardly open pocket on the back of the section adjacent the leading edge thereof adapted to partially receive a finish trowel blade of the finisher, a spring clip secured to the top surface or the pocket-forming means and extending rearwardly therefrom so as to be engageable with the finish trowel blade to retain the section thereon, and wherein said rectangular sheet metal has attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element bonded to a resilient backing. 
     
     
         2 . In combination with a cement floor finisher having one or more finishing trowel blades mounted for rotation thereon and adapted to be moved over a floor to be finished, corresponding float trowels underlying the finish trowel blades, said float trowels having rearwardly open pockets formed thereon adjacent the leading edges thereof partially receiving the finish trowel blades, means on the float trowels for releasably retaining the float trowels on the finish trowel blades, wherein said float trowel includes attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element having a resilient backing bonded to said bottom surface. 
     
     
         3 . A float trowel for cement floor finishers comprising a rectangular section of sheet metal having a top surface and a bottom surface and optionally having its leading edge and its side edges bent upwardly, means providing upright surfaces on the upper side of said section arranged to engage the leading edge and end edges of a finish trowel of a cement floor finisher so that said section can be held against lateral displacement with respect to the finish trowel by said surfaces, a rearwardly extending spring clip secured to said section extending rearwardly over the upper surface of said section so as to be engageable with the finish trowel to retain said section thereon and wherein said metal sheet has attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element bonded to a resilient backing. 
     
     
         4 . The float trowel blade attachment of  claim 1 , wherein said adhesive is a thermoset adhesive. 
     
     
         5 . The float trowel blade attachment of  claim 1 , wherein said mechanical attachment material interlayer uses a hook and loop means. 
     
     
         6 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes diamond particles as the abrasive. 
     
     
         7 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes cubic boron nitride. 
     
     
         8 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes boron carbide. 
     
     
         9 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes titanium carbide. 
     
     
         10 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes silicon carbide. 
     
     
         11 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes zirconia. 
     
     
         12 . The float trowel blade attachment of  claim 1 , wherein said abrasive element includes fused aluminum oxide. 
     
     
         13 . The float trowel blade attachment of  claim 1 , wherein said composite rigid abrasive element includes a substrate made of two or more non woven layers. 
     
     
         14 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include polyester fibers. 
     
     
         15 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include nylon fibers. 
     
     
         16 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include polypropylene fibers. 
     
     
         17 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include rayon fibers. 
     
     
         18 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include acrylic fibers. 
     
     
         19 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include glass fibers. 
     
     
         20 . The float trowel blade attachment of  claim 13 , wherein said non woven layers include mixtures of polyester and polypropylene fibers.