Patent ID: 7234383
Filing Date: 2007-06-26
Classification: B28D,C03B,Y10T

Abstract:
1. A tip holder for holding a rotating shaft which is inserted through an axial center of a cutter wheel tip for scribing a brittle material, the tip holder comprising: a pair of side walls having respective substantially cylindrical supporting receptacles into which tip receivers are respectively inserted; and a top portion connecting upper portions of the pair of side walls, wherein the pair of side walls and the top portion are integrally formed, the tip receivers prevent the cutter wheel tip from abrading the side walls due to contact with the side walls, each of the tip receivers comprises a central through-hole into which side portions of the rotating shaft are respectively inserted, and each central through-hole is provided with a groove located at an upper portion of the central through-hole or directly above a central axis of the central through-hole, the groove having an inner surface that is continuous with an inner circumferential surface of the central through-hole, such that a cross-sectional perimeter of the groove extends continuously from a cross-sectional perimeter of the central through-hole, and the groove being provided along substantially the entire length of the side portions of the rotating shaft.