Patent ID: 6256857
Filing Date: 2001-07-10
Classification: B26D,B26F,Y10T

Abstract:
A method of retaining a broach cutting tool member in a broach tool holder, said broach tool holder comprising:a top surface, an oppositely disposed bottom surface, and an intermediate surface interposed said top and bottom surfaces, said broach tool holder further comprising a first planar abutment surface extending from said top surface, a second planar abutment surface extending from said top surface and spaced a predetermined distance from said first planar abutment surface, said first planar abutment surface and said second planar abutment surface forming a dihedral right angle, said first and second planar abutment surfaces further forming a right angle with said top surface;said broach cutting tool member comprising a bottom end surface, a top end surface opposite said bottom end surface, a peripheral outer surface interposed said top end surface and said bottom end surface, said peripheral outer surface having two planar abutment surfaces disposed along said peripheral outer surface and extending perpendicularly to said top end surface and said bottom end surface of said broach cutting tool member, said two planar abutment surfaces adapted to be complementary, respectively, to said first planar and second planar abutment surfaces, disposed on said broach tool holder, said peripheral outer surface of said broach cutting tool member further having a third planar abutment surface disposed along said peripheral outer surface, said third planar abutment surface having at least a portion extending obliquely with respect to one of said top end surface and said bottom end surface of said broach cutting tool member;said method comprising the steps of positioning said two planar abutment surfaces of said broach cutting tool member contiguous said first planar and said second planar abutment surfaces, respectively, of said broach tool holder and simultaneously locating said bottom end surface of said broach cutting tool member on said intermediate surface of said broach tool holder whereby when said broach cutting tool member is positioned in said broach tool holder a predetermined accurate work position is established for said broach cutting tool member; andlocking said broach cutting tool member in said predetermined accurate work position, by imposing a locking force on said at least a portion of said third planar abutment surface of said broach cutting tool member, said locking force having a force component directed towards said two planar abutment surfaces of said broach cutting tool member and a force component directed downward from said top surface towards said intermediate surface of said broach tool holder to securely hold said broach cutting tool member in said broach tool holder.