Patent ID: 6378406
Filing Date: 2002-04-30
Classification: B25B,F16B

Abstract:
A driver bit for a screw having a screw head portion, the screw head portion having bit mate flutes and substantially vertical end wall portions of a predetermined depth formed at end portions of the bit mate flutes, the bit mate flutes being formed to become wider radially outwardly from the central portion of the screw head portion, said driver bit comprising:flat blade portions having substantially vertical end portions, the substantially vertical end portions having a distal end portion being formed to become wider outwardly and configured to be fitted into the bit mate flutes of the screw head portion along the substantially vertical end wall portions of the screw head portion; and a conical projected portion forming a distal end face of the flat blade portions, the conical projected portion having at least one surface inclined at an angle of from 25Â° to 35Â° relative to the horizontal.