Patent ID: 8850934
Filing Date: 2014-10-07
Classification: B21K,B25B

Abstract:
1. A screwdriver blade, comprising: a shank having a shank proximal end, a shank distal end and a longitudinal axis; a face formed on a front side of the shank and extending from the shank distal end toward the shank proximal end, the face having two side edges; a drive surface extending from each side edge inward toward the longitudinal axis, each drive surface being inclined relative to a plane containing the axis and bisecting each of the side edges; a thickness of the blade measured from each drive surface to a back side of the shank increasing from the shank distal end toward the shank proximal end; wherein: each drive surface has an inner margin; a central portion is located between the drive surfaces and joins the inner margins; and each inner margin is a straight line that is parallel to a closest one of the side edges when viewed in a front view, thereby defining a constant width for each of the drive surfaces.