Mounting device for coated abrasive finishing articles

A mounting apparatus for rotatably securing a coated abrasive finishing article (10) having a first surface (12) coated with abrasive material and a second uncoated surface (14) and defining a centrally located first aperture (16), having an edge (24) therethrough, to a power tool drive member (30) which includes a support member having a support pad (32) for engaging said second surface, a nut (18) having a body extending through said aperture for threadably engaging said power tool and said body having an outwardly extending first flange (20) at one end engaging said first surface characterized by:

• the body of said nut having (a) an outer irregular surface (22) adapted to engage said edge (24) of said aperture (16) in a substantially interference fit, and (b) a centrally disposed threaded bore (26) for engagement with said power tool drive member (30);
• the support pad defining a centrally located second aperture (35) therethrough and having a face (34) for engaging said second surface, said pad having a reduced thickness region adjacent and surrounding said second aperture;
• and
• said support member further including a hollow externally threaded cylinder (42) having a second outwardly extending flange (36) at one end thereof and a compression ring (46) defining internal threads, said second flange being received within said reduced thickness region and said compression ring being threadably received on said external threaded cylinder to secure said support pad upon said cylinder, said one end of said cylinder defining a recess (64) for receiving said first flange so that when assembled in operational configuration on said power tool, said flange is below said first surface so as not to engage a work piece.