Abstract: A tool is retained in a socket of a mineral cutter by an elastomeric element acting between the shank of the tool and the wall of the socket. The element is formed with corrugations that abut the wall of the socket and oppose the forces applied to the cutter of the tool.

Abstract: The specification describes a rock bit of the button type comprising: a drill head body; a bit face part; a friction weld rigidly joining said bit face part to said body; a plurality of bores in the bit face part of said body extending substantially from the drill head body through said bit face part to exterior surfaces of the latter; insert cutters in certain of said bores, each of said cutters having a body portion within such bore and carrying an enlargement determining the outward limit of location of said cutter in said bore relative to said drill head body and defining with said bore and said drill head body a cavity beneath said insert cutter above said head and within said bit face part; and material extending into said cavity and supporting said insert cutter in said bore.