Patent ID: 6131916
Filing Date: 2000-10-17
Classification: B23B,Y10S,Y10T

Abstract:
A chuck apparatus comprising:a mounting base having a front surface;a shaft protruding from a center of said front surface of said base, said shaft having a longitudinal axis, a base end connected to said base, a distal end opposite said base end, and a tapered outer peripheral surface;a hole formed in said shaft along said longitudinal axis of said shaft so as to form an inner peripheral surface of said shaft, said hole having an opening at said distal end of said shaft and being shaped such that holding portions and pressure portions are formed on said inner peripheral surface of said shaft, said holding portions being evenly spaced around said inner peripheral surface of said shaft and being located a first distance from a center of said hole, said pressure portions being evenly spaced around said inner peripheral surface of said shaft between said holding portions and being located a second distance from said center of said hole, said first distance being smaller than said second distance;a rotating cylinder having a longitudinal axis and being detachably fitted on said outer peripheral surface of said shaft, said rotating cylinder being removed from said shaft after mounting of a tool in said hole or removal of a tool from said hole; anda plurality of rollers arranged along an inner peripheral surface of said rotating cylinder, each of said rollers having an axis of rotation parallel with said longitudinal axis of said rotating cylinder.