Patent ID: 6499919
Filing Date: 2002-12-31
Classification: B23B,B27G,Y10S,Y10T

Abstract:
A cylindrical drill bit comprising a tool body with a quasi-cylindrical head having a front face and a cylindrical shaft extending axially from said head for chucking said tool body, and a hard metal cutting plate structure disposed on the front face of said head and including hard metal cutting edges integrally formed with said hard metal plate structure, said hard metal cutting plate structure including a number of equal circle segment-like plate sections which are arranged at equal angular distances around a center portion of said hard metal cutting plate structure, and each of said segment-like plate sections having a circumferentially extending outer web and two radial webs extending between the circumferential ends of said outer web and said center portion in a spoke-like manner, with an opening disposed between the circumferentially extending outer web and the two radial webs.