Patent ID: 8029216

Claim:
A cutting tool assembly having a longitudinal axis L defining a front-to-rear direction and comprising: a chuck comprising: a receiver having a bore; a collet receivable into the bore of the receiver, the collet having a through-hole extending along said longitudinal axis, an inner surface of the collet comprising a peripheral inner slot and a crest, the crest comprising a collet front, an axially rearwardly facing first slot face, and a front inner surface extending between the collet front and the first slot face, at least a portion of the front inner surface being radially inward of the peripheral inner slot; and a nut threadingly engageable to the receiver and configured to abut the collet when the nut is threadingly engaged to the receiver; and a shank extending along said longitudinal axis and releasably secured in said through-hole, the shank comprising a shank peripheral envelope having a peripheral shank slot formed therein, the shank slot defining a trough comprising an axially rearwardly facing first slot side, an opposing axially forwardly facing second slot side, and a slot base extending therebetween; wherein the collet is transferable between: a releasing position in which the shank is accommodated in, and slidable through, the collet through-hole, with the crest positioned outside of the trough; and a securing position in which the crest is at least partially accommodated in the trough.