Patent ID: 7264427
Filing Date: 2007-09-04
Classification: B23B,B27G,Y10T

Abstract:
1. A drill bit apparatus comprising: a central shaft and an annular collar mounted on said central shaft, said central shaft being coaxially Positioned within said annular collar, said central shaft having a bit end and a cutting tool end, said annular collar being spaced between said bit end and said cutting tool end, said bit end configured for releasable securement in a chuck of a drill or drill press, said cutting tool end configured to securably receive a cutting tool therein, said cutting tool having an upper portion and a lower portion, said lower portion extending axially from said cutting tool end, and an upper portion extending radially from said cutting tool end, said lower portion comprising a central bore cutter essentially coaxial with said central shaft, said upper portion comprising a counter bore cutter having a width greater than said central bore cutter, said counter bore cutter extending below a lower surface of said annular collar a distance less than the distance that said central bore cutter extends below said lower surface, a flange radially extending from said central shaft, said flange frictionally engaging an upper surface of said annular collar, and a C-clip positioned within a circumferential groove on said central shaft spaced from said flange, said C-clip engaging said lower surface of said annular collar.