Screw driver shank

  • Inventors:
  • Assignees: Barnes B O
  • Publication Date: September 19, 1973
  • Publication Number: GB-1330998-A


1330998 Screwdriver shanks B O BARNES 3 Feb 1972 5178/72 Heading B3N A screwdriver shank 1 has a bit portion formed by vanes 9 separated by flutes 2, each vane has an outer wall 10 extending at an incline from the periphery of the shank to the apex 11 of the bit, a first side edge portion of the outer wall adjacent the apex region, from point 11 to point 13 or 14, having a different incline from a second side edge portion, from either of points 13 or 14 to point 6 or 7 respectively, whereby in operation, only the first side edge portion engages inner surfaces of a suitably recessed screw head.




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