Patent ID: 7311026

Claim:
A threaded screw and screwdriver tip in combination comprising: the screw comprising: a screw shank; and a screw head having a tapered slot bisecting a top end portion of the head, the head secured at an opposing bottom end to the shank portion, the screw head comprising one or more circumferential side edges joining the top end portion and the head bottom end, the slot tapered across the top portion of the head such that the slot is narrowest at a center portion of the head and widens outwardly, the slot having substantially opposing inclined sidewall surfaces connected by a substantially flat bottom surface; the sidewall surfaces inclined such that the slot is widest where the sidewalls intersect the bottom surface, the walls inclined to form a ledge for capturing the screwdriver tip against the sidewalls and the slot bottom surface; wherein the screw head sidewalls having two halves, each half consisting of two joined faces, one a first flat face normal to the screw head bottom surface and having one edge intersecting the top end portion of the head, and a second flat face joined at one edge to another edge of the first flat face and intersecting the screw head bottom surface at an incline angle of between 20 to 99 degrees relative to the screw head slot bottom surface, the second flat face incline forming the ledge for capturing the screwdriver tip; and the screwdriver tip sized and configured for being received and engaged into the screw slot, the tip having a screw slot insertion end, a driven portion, and a middle portion between the insertion end and the driven portion, the tip comprising: a tip bottom face at the insertion end of the tip; and opposing major front and rear torque drive faces joined by circumferential right and left side faces, the faces intersecting the tip bottom face, the front and rear faces formed such that the tip widens from a central portion of the tip outwards towards the right and left faces; the right and left faces formed such that the bottom face is wider than a distal parallel section taken through the middle portion of the tip so that the insertion end of the tip can be retentively engaged under the ledge of the screw slot; wherein the screwdriver tip front and rear faces each having two halves, each half having two tip joined faces, a first tip flat face normal to the tip bottom face, and a second tip flat face joined to an edge of the first tip flat face and intersecting the tip bottom face at an incline angle of between 20 to 99 degrees relative to the tip bottom face, the two tip joined faces sized and formed to be received into the screw head slot, engage the screw head joined faces and be retentively engaged by the ledge of the screw slot; and an incline angle of the screw and the screw driver tip is between 45 and 90 degrees.