Patent ID: 6375398
Filing Date: 2002-04-23
Classification: B23B,Y10T

Abstract:
A toolholder assembly comprising:an elongated spindle adapted to be rotatably driven about a longitudinal axis, said spindle having a longitudinally extending bore open at one end, a chuck having an elongated shank and means at one end of said shank for coaxially securing a tool to said shank, a second end of said shank adapted for insertion into said spindle bore, means attached to said spindle for releasably coaxially securing said chuck to said spindle upon insertion of said chuck shank into said spindle bore to an operative axial position, a piston longitudinally movably mounted in said spindle bore on a guide fastener, said guide fastener being secured to said spindle at said second end of said bore and engaging said second end of said shank upon insertion of said chuck into said spindle bore, a spring disposed between said spindle and said piston which resiliently urges said piston toward said first end of said bore, said piston having an axially extending surface which engages a mating surface on said second end of said chuck shank and centers said second end of said chuck shank upon insertion of said chuck to said operative position.