Tool-holding devices

Claim 1

A toolholder for holding a cutting tool having a holdable portion of greater diameter than its cutting portion, and a tool magazine for receiving a plurality of toolholders, said toolholder having a cylindrical stepped hole comprising a lower cylindrical portion of diameter less than the holdable portion and greater than the cutting portion to receive the latter, and an upper cylindrical portion of diameter slightly greater than the holdable portion to receive the latter, the wall of the upper cylindrical portion having at least two spaced annular recesses, a ring of resilient material housed in each recess and projecting inwards from the wall to grip the holdable portion, an abutment being formed by the change in diameter between the upper and lower cylindrical portions, against which the holdable portion bears, to limit insertion of the tool into the toolholder, said tool magazine having a plurality of stepped cylindrical holes of the same size having an upper cylindrical portion and a lower cylindrical portion with the change in diameter therebetween forming a step, a plurality of said toolholders inserted each in one of the upper cylindrical portions of the stepped cylindrical holes in the magazine and bearing against the step therein, said toolholders being externally cylindrical and of the same diameter but having different diameter stepped holes therein, and means retaining each toolholder in its hole in the magazine.