Patent ID: 9687913
Date: 2017-06-27
CPC Classifications: B23B,Y10T

Claim:
1. An I.D. collet, comprising: (a) a housing having a first end, a second end, and a hollow bore extending between the first end and the second end; the hollow bore having a first portion and a second portion; and an abutment wall assembly defined at the juncture of the first portion and the second portion of the hollow bore and having an undercut portion and a concentric lip; (b) a taper screw slidably located in the hollow bore of the housing at the first end of the housing and structured to be movable into and out of the hollow bore of the housing; the taper screw having a conical head located outside of the hollow bore of the housing adjacent to the first end of the housing and a second end with external threads and located inside the hollow bore of the housing; the conical head of the taper screw having a first end with a first end diameter and a second end with a second end diameter, the second end diameter being less than the first end diameter with the conical head having an outer surface which tapers from the first end of the conical head to the second end of the conical head; (c) a spindle mounted in the housing adjacent to the first end of the housing, the spindle having a hollow bore with an internal diameter for slidably receiving the taper screw for movement into and out of the spindle with the conical head moving into and out of the hollow bore of the spindle, the second end diameter of the conical head being less than the spindle bore internal diameter and the first end diameter of the conical head being greater than the spindle internal diameter, the outer surface of the conical head slidably engaging the spindle and enlarging the spindle as the conical head moves into the spindle hollow bore and into the housing; and (d) a draw nut assembly comprising a threaded rod, a cap, a shaft connected to the cap, and at least two tangs connected to the shaft; the threaded rod having a first end and a second end, the first end having a blind-ended bore extending toward the second end of the threaded rod and having internal threads sized and shaped to threadably receive the external threads of the taper screw of the spindle to attach the taper screw to the threaded rod of the draw nut assembly inside the housing; the cap, shaft and at least two tangs being mounted on the threaded rod; and the two opposed tangs extending radially outwardly from the threaded rod and received in the second portion of the hollow bore of the housing, each of the tangs having a surface structured to abut the undercut portion of the abutment wall assembly in the hollow bore of the housing to stop movement of the tangs towards the second end of the housing and to stop movement of the conical head of the taper screw into the hollow bore of the spindle and enlargement of the spindle.