Patent ID: 6098499
Filing Date: 2000-08-08
Classification: B25B

Abstract:
A tool for extracting a bolt or screw from a bore wherein the head of the bolt or screw is removed comprising, in combination:a tap member having a driving head end and a broach end, said ends being generally concentric, said head end shaped to receive a rotational driver and having a distal land for impact on the tool; andsaid broach end having a longitudinal axis and a series of alternating recesses and ribs about the circumference of the broach and parallel to the axis, each recess and each rib having a substantially uniform, single radial arc cross sectional configuration transverse to the axis and alternating between a smoothly curved concave recess and a convex rib, said cross sectional profile being uniform along a length of the axis, said radius of said curved, convex rib in the range of 25-45% of the curved, concave radius of the recess, said ribs and recesses being uniformly and equally separated from one another.