Screw threaded fasteners

  • US RE34,928 E
  • Filed: 06/25/1992
  • Issued: 05/02/1995
  • Est. Priority Date: 08/03/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. A double ended fastener which is symmetrical about a mid-point on its longitudinal axis, comprising:

  • (a) a pilot portion at each end;

    (b) an encircling groove next to each pilot portion;

    (c) a minor toothed portion next to said groove .Iadd.and having helical teeth.Iaddend.;

    (d) a second like groove next to said minor toothed portion; and

    (e) a major toothed portion next to said second groove and extending towards said mid-point, .Iadd.said major toothed portion having helical teeth, .Iaddend.the fastener having a female screw-threaded bore provided over the whole of its length.

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