Patent ID: 7628571

Claim:
A tool chucking apparatus for holding a machining cutter or tool, comprising: a fastening member which has a first housing space inside; a collet which is held in the first housing space in a tight manner and has a plurality of pawl structures which are spaced in an annular manner and formed a conical structure; a holding member which has a second housing space inside; and an extension member which is located between the holding member and the fastening member and includes a support portion and an anchor portion separate from said support portion that are removably coupled together at an end of both portions; the support portion having another end coupling tightly with the collet and the fastening member; the anchor portion having another end held in the second housing space to form a tight coupling with the holding member; the support portion being replaceable with a desired length specification according to the cutter or tool being used; wherein the fastening member, the collet, the holding member and the extension member are hollow in the center thereof to form an installation passage after assembly to hold the cutter or tool; wherein the support portion of the extension member and the holding member are coupled through corresponding second coupling portions; and wherein the second coupling portions have at least one threaded passage to receive a corresponding bolt to enhance the coupling of the extension member and the holding member.