JPS5775708A - Pawlled center - Google Patents

Abstract

PURPOSE: To integrate the head part for slidably inserting a tapered shank and a center shaft and eliminate offset of cores of the tapered shank and the center shaft in such a way that grooves which traverse each pawl hold bottom are provided around the outer periphery of the head part of a pawlled center, and the opening portions of the grooves are welded and closed.

CONSTITUTION: Pawl holes 5 are drilled along the axial line and in the front of the head part 3 which is uniformly integrated at the leading edge of the tapered shank 2 of the center body 1, at equal intervals and at an equal distance from a center hole 4 which is provided on the axial line of the head part 3 while narrow and long annular grooves b of rectangular sectional form which traverses the bottom of each pawl to the trailing edge part of the outer pheiphery of the head 3 and incises this bottom to the depth into the intermediate position between the pawl holes 5 and the center hole 4 are arranged on the rear end of the outer peripheral of the head part 3, and opening portions of the grooves 6 are formed into V-letter shaped and welded, and closed by bridging deposited metal 7 so as to form in head part 3 an annular plate-shaped pawl supporting oil path 8 which crosses the bottom of each pawl hole 5. This facilitates to form the head part 3 in an integrated configuration in which tapered shank 2 and the center shaft are slidably fitted to each other.

COPYRIGHT: (C)1982,JPO&Japio