Patent ID: 7534076
Filing Date: 2009-05-19
Classification: B23B,Y10T

Abstract:
1. A core bit for a concrete drill comprising: a drill portion in a cylindrical shape; a boring blade formed at one end side of the drill portion; a mounting portion in a cylindrical shape formed on the other end side of the drill portion; an engaging member for engaging with a drill chuck, the engaging member being formed at an outer peripheral face of the mounting portion; and a flange portion formed at the outer peripheral face of the mounting portion, disposed on a side of the boring blade of the engaging member and having a diameter larger than an outer diameter of the engaging member and an outer diameter of the drill portion, wherein the engaging member comprises a locking piece formed to project from the outer peripheral face of the mounting portion in an outward radial direction, the locking piece configured to prevent movement of the core bit in an axial direction within a chuck, and the locking piece includes an end surface on a side of the flange portion, the end surface of the locking piece being perpendicular to an axial direction of the drill portion.