The invention is illustrated in the accompanying drawings, in which:
The invention is described with particular reference to the accompanying drawings forming a part of the present specification. The instant invention is directed to an improved surface treatment apparatus and method wherein surface adherents are removed efficiently and thoroughly by use of cutter assemblies having a replaceable carbon steel frusto-conical cutter or blade 20 with an annular beveled cutting edge 24. By contacting the floor surface with the beveled cutting edge 24, the problems associated with material buildup on prior art abraders are eliminated.
A power rotated horizontal plate 10 for a floor conditioning machine, illustrated in a bottom perspective view in
A particular advantage of the instant invention is the ability to loosen and rotate the blade 20 to present a new section of the cutting edge 24, thereby greatly extending the life span of the blade 20.
Each igloo shaped support 18 is welded to the plate 10 at equal intervals forming a circumferential ring of blades 20. Each igloo shaped support 18 has a frusto-conical shaped socket 31 with which the complimentary shaped frusto-conical shaped surface 32 of the blade 20 engages in a wedging fit upon tightening of the screw fastener 22. The wedging fit of the frusto-conical surfaces of the socket and the blade 20 and the wedging fit of the tapered head of the screw 22 nonrotatably secure the blade 20 to its support 18. The front face 36 of the blade 20 and the rear face 37 of the blade 20 are substantially parallel, with the radially outer edge of the front face 36 tapering axially outwardly thereby forming a tapered circumferential cutting lip 38 with the sharp tapered cutting edge 24.
As illustrated, the igloo shaped support 18 is notched presenting a vertical wall 41, in general alignment with the face 36 of the blade 20, and a horizontal shoulder 42 positioned below the lower edge of the socket 31. During a floor surface operation the disc 17 is driven clockwise about its vertical axis 43 indicated by an arrow 44 in
Prior art floor abrading devices present a flat abrasion face which is parallel to the surface. A particular problem is the accumulation of material in the roughened face of the abrasive. As abraded material, surface dust and dislodged abrasive particles are created they tend to lodge in the surface of the abrasive thereby decreasing the effectiveness. With the present invention a relatively sharp cutting edge is presented, instead of a flat face thereby eliminating the accumulation of particles on the surface working tool. As a result the amount of time required to clean a large area is decreased due to the self cleaning feature of the blade 20. As the cutting edge wears, the blade can be rotated very easily to prevent a new edge. In order to renovate the usual power driven floor abrader, the abrasive element must be frequently replaced at considerable operating expense.