Patent ID: 6357832
Filing Date: 2002-03-19
Classification: E21C

Abstract:
A tool retainer for receiving a tool having a radial flange with a radial flange with a first given diameter and a cylindrical mounting portion, said tool retainer comprising,a retainer body having a forward surface, said retainer body being attachable to a machine, said retainer body having a cylindrical aperture therein, said cylindrical aperture having an opening in said forward surface, said cylindrical aperture having an axis and as axial length, said forward surface having a countersink around said cylindrical aperture, said countersink having a frustoconical inner surface connecting with said forward surface, said countersink having an axial length less than half said axial length of said cylindrical aperture, said countersink having a rear surface extending radially outward from said cylindrical aperture to said frustoconical inner surface, said frustoconical inner surface having an incline of at least 10 degrees, and said at least 10 degree incline extending from said rear surface to said forqward surface without interruption, a unitary annular insert in said countersink, said annular insert having a cylindrical central opening axially aligned with said axis of said cylindrical aperture of said retainer body, and a frustoconical outer surface complementary to said frustoconical inner surface of said countersink, and a rear surface complementary to said rear surface of said countersink, said annular insert made of tungsten carbide, and brazing material between said retainer body and said annular insert for attaching said insert within said countersink of said retainer body.