Patent ID: 7513719
Filing Date: 2009-04-07
Classification: B23D,Y10T

Abstract:
1. An apparatus for joining a new conduit to an embedded conduit having inner and outer diameters, the apparatus comprising: a mandrel including a cylindrical shoulder stop with a proximal end surface and a distal end surface, the mandrel further including a shank that is integral with the shoulder stop, the shank having a proximal end portion that projects axially from the proximal end surface of the shoulder stop and a distal end portion that is securable in a chuck and projects axially from the distal end surface of the shoulder stop; a cylindrical cutting head having an outer diameter between the inner and outer diameters of the embedded conduit, and further having a proximal end surface, a distal end surface, and an axial through bore for mounting the cutting head on the mandrel in an installed position in which the proximal end portion of the shank extends through the bore and the distal end surface of the cutting head abuts the proximal end surface of the shoulder stop; and a pilot head having an outer diameter matching the inner diameter of the conduit, and further having a distal end surface and an axial through bore for mounting the pilot head on the mandrel in an installed position in which the distal end surface of the pilot head abuts the proximal end surface of the cutting head.