| 摘要 |
A collet chuck device has a body member with a frustoconical recess defined therein. A collet is disposed within the recess. A nut member is rotationally configured on the body member to move the collet axially within the recess. The nut member has an outer sleeve member and an inner sleeve member concentric within the outer sleeve member. The inner sleeve member is threadedly engaged on threads defined on the body member and contains ball grooves defined on an outer circumferential surface thereof. The outer sleeve member has ball grooves defined on the inner circumferential surface thereof and rolling bodies are operably disposed in the ball grooves so that the outer sleeve member is rotatable relative to the inner sleeve member. Upon rotation of the nut member on the body member in the tightening direction, the outer sleeve member advances axially in the tightening direction relative to the inner sleeve member through engagement of the rolling bodies in the ball grooves and thereby forces the collet further into the frustoconical recess.
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