Grinding tool fitted with an abrasive sheet having active face and edge surfaces

DETAILED DESCRIPTION What I claim is: 1.
A rotary abrasive tool comprising: a rotary support having a substantially flat circular lower face and a peripheral edge; a resilient circular pad overlying said flat face and having a flat working face on the bottom thereof and a peripheral edge of substantial width; a sheet of abrasive coated material overlying said working face and having a multiplicity of edge tabs extending upwardly over said peripheral edges, said edge tabs being configured and arranged to lie against said peripheral edge in mutual edge-abutting relation to thereby define a smooth and continuous abrasive edge surface for said tool; and means releasably securing only the upper ends of said tabs to the peripheral edge of said support.
2.
An abrasive tool as defined in claim 1 wherein said tabs are integral with said sheet and are defined by V-shaped notches in the edge portion of said sheet, the apices of said notches being substantially coincident with the periphery of said working face.
3.
An abrasive tool as defined in claim 2 wherein said tabs are of truncated triangular shape, tapering outwardly.
4.
An abrasive tool as defined in claim 1 wherein said peripheral edges define a downwardly tapering frusto-conical surface.
5.
An abrasive tool as defined in claim 4 wherein said last-named means comprises a substantially rigid ring wedgingly clamping the upper ends of said tabs against the peripheral edge of said rotary support.
6.
An abrasive tool as defined in claim 5 including a circumferential groove in the peripheral edge of said rotary support, a resilient ring in said groove and extending outwardly therefrom, said rigid ring pressing said tabs against said resilient ring.
7.
An abrasive tool as defined in claim 6 including a peripheral groove on the inner periphery of said rigid ring opposite said resilient ring.
8.
An abrasive tool as defined in claim 1 wherein said rotary support comprises a flat disc having stiffening ribs on its upper surface, its peripheral edge being defined by an upstanding peripheral flange