Rotary grinding wheel

Claim 1

A rotary abrasive grinding head adapted progressively to traverse a pre-grooved refractory surface in a longitudinal direction with respect to a series of ribs established between the grooves and thereby to remove such ribs and reduce the refractory surface to a planar condition, said grinding head comprising a generally cylindrical body having a circular end face , said end face being bevelled to provide a frusto-conical area, a cylindrical side surface, a series of circumferentially spaced impact members mounted on said side surface and adapted to traverse said ribs crosswise during the forward progressive movement of the head and by impact therewith fracture the same and eject the fragments produced by the fracture, an abrasive segment mounted on said side surface and positioned immediately behind each impact member, each of said abrasive segments having a forward abrasive surface which is substantially coplanar with the forward surface of its associated impact member, an annular series of abrasive segments concentrically mounted on said end face and adapted during such forward progressive movement of the head to eradicate the residual portions of said ribs , and a second annular series of abrasive segments on said frusto-conical area.