Importance

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Abstract

It is an object of the invention to provide a constituent member of a collet chuck, a collet and a fastening nut as well as a collet chuck capable of reinforcing a holding force of a tool. As means therefor, in a collet chuck including a chuck body having a taper hole in an inwardly converging shape, a diameter contractable collet having a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, there is provided a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof, wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face of the force increasing collet is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet frontwardly.

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First Claim