Patent ID: 6116827
Filing Date: 2000-09-12
Classification: B23B,E21B,Y10T

Abstract:
A drilling tool comprising:a center drill having a center drill shank, a clamping end, and at least one of radially extending projections and widenings on said center drill shank;a front drill body comprising a drilling side, a clamping side, and an axially arranged bore for receiving said center drill;a rear clamping end having a clamping shank; andmeans for at least one of securing and positioning the center drill provided in the drill body proximal to its clamping end,wherein the center drill is insertable into said axial bore from the clamping side of said front drill body; the front drill body and the rear clamping end are detachably and directly connectable; and the center drill is detachably connectable to at least one of said front drill body and said rear clamping end by means of radially extended recesses in at least one of said front drill body and said rear clamping end cooperating with the at least one of the radially extending projections and widenings on said center drill shank to effect a positive connection between said center drill and at least one of said front drill body and said rear clamping end.