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Screw for use as a fastener in fibrous material such as wood

  • US 6,152,666 A
  • Filed: 03/16/1999
  • Issued: 11/28/2000
  • Est. Priority Date: 04/03/1998
  • Status: Expired due to Term
First Claim
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1. A screw fastener comprising:

  • (a) a shank having a first end defining a pointed tip, an opposed second end and a thread extending over at least a portion of the overall length of the shank;

    (b) the thread being provided with a system of radially inwardly narrowing W-shaped cutouts disposed at a predetermined spacing from each other;

    (c) said system of W-shaped cutouts being comprised of a plurality of pairs of generally V-shaped cutout sections, the V-shaped cutout sections of each pair being closely spaced from each other, whereby each pair of said V-shaped cutout sections defines a generally W-shaped cutout;

    (d) the spacing between adjacent W-shaped cutouts being substantially larger than that between the V-shaped cutout sections of each said pair.

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