Improvements in or relating to an abrasive wheel

Claim 1

An abrasive wheel of the consumable type comprising: a circular blade mountable on a grinding machine; a plurality of abrasive segments positioned around the periphery of said circular blade, each of said abrasive segments including a segment formed of a bonded abrasive material of the type consumable during a grinding operation, a securing plate having a portion imbedded in said segment only a portion of the radial height thereof and a portion not imbedded in said segment, the thickness in the axial direction of said securing plate being uniform throughout the radial height thereof and less than the thickness in the axial direction of said segment, each of said segments and plates having lateral edges forming extensions of radii of said circular blade, the radial portion of said segment having no plate imbedded therein forming a plate-free abrasive portion, and a pair of webs of fibrous core material located only in said segment and extending through said segment over the total radial height thereof on opposite sides of said securing plate in planes parallel to the plane of said securing plate; said circular blade having an annular groove extending radially inwardly from the outer periphery thereof, said annular groove defining two separate axially spaced blade portions; said securing plate portions not imbedded in said segments extending into said annular groove between said spaced blade portions; each said securing plate portion within said groove having therethrough a securing hole; said spaced blade portions having a plurality of pairs of axially aligned tapered fixing bores therethrough; each pair of axially aligned fixing bores being axially aligned with a securing hole of a respective one of said securing plate portions; at least a first fixing bore of each said pair of fixing bores having a tapered insertion therein, said insertion having a threaded opening therethrough; and a plurality of retainer means, each of said retainer means having a tapered first portion positioned within a second fixing bore of a respective pair of fixing bores and a threaded second portion threaded into said opening of said insertion, for selectively removably securing and detaching said securing plate portions not imbedded in the respective segments to said securing plate.