Patent ID: 6585327
Filing Date: 2003-07-01
Classification: E21C

Abstract:
A tool retainer for receiving a tool having 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 opening in said forward surface, said cylindrical aperture having an axis and an axial length, said forward surface having a countersink around said cylindrical aperture, said countersink having an axial length less than half said axial length of said cylindrical aperture and having an annular inner surface, said countersink having a rear surface extending radially outward from said cylindrical aperture to said annular inner surface, said inner surface continuously diverging from said rear surface to said forward surface and having a rate of incline without interruption of at least 10 degrees from said rear surface to said forward surface, a unitary annular insert in said countersink, said unitary annular insert having a cylindrical central opening axially aligned with said axis of said cylindrical aperture of said retainer body, an outer surface complementary to said inner surface of said countersink, and a rear surface complementary to said rear surface of said countersink, said unitary annular insert made of tungsten carbide, and brazing material between said retainer body and said unitary annular insert for attaching said unitary annular insert within said countersink of said retainer body.