Retention knob for tool holder

摘要

A retention knob for use with a tool holder that is less prone to distorting a tapered tool holder surface, especially if it is over-tightened. The retention knob includes a knob head, a flange engageable with an end of a tool holder shank, a pilot segment receivable by the counter bore defined by said tool holder shank and a threaded segment spaced from said flange by an undercut segment. The threaded segment is configured so that it has a length that is substantially the minimum length required to achieve maximum thread holding strength. The undercut segment is configured to space the threaded segment from its head so that a distal end of the threaded segment is substantially near the bottom of the tapered bore forming part of the tool holder.

主权项

1. A retention knob for use with a tool holder, comprising:
a) a retention knob head engageable by a spindle and a retention knob flange abutably engageable with a driven end of a tool holder; b) a pilot section receivable by a counter bore in said tool holder; c) a threaded segment engageable by a threaded bore defined by said tool holder, said threaded segment spaced a predetermined distance from said pilot section by an undercut segment; d) said threaded segment having a length that is the minimum length required for maximum thread strength and said threaded segment being spaced by said undercut such that the distal end of said threaded segment is spaced away from an end of said threaded bore in said tool holder by a small amount to avoid binding between said retention knob in the end of said threaded bore and said threaded segment is balanced by controlling said length to insure that the axially spaced lead-in and lead-out of said threads on said threaded segment are substantially 180° apart.