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Insert of the self-tapping fluted type

  • US 4,003,287 A
  • Filed: 07/08/1975
  • Issued: 01/18/1977
  • Est. Priority Date: 07/08/1975
  • Status: Expired due to Term
First Claim
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1. A fastener element or insert of the self-tapping type intended for engagement in a recess of a plastic article and having means for mating with a complementary fastener element, comprising;

  • a cylindrical body formed with external threads and with a series of flutes angularly spaced about the circumference of the body, said body having tapered end portions and said flutes merging into said end portions short of the extremities of the body, the relationship of said flutes and threads in the sense of the dimensions thereof being selected such that upon threading of the full length of the insert into a recess the radius of which is less than the radial distance measured between the axis of the body and the point of greatest depth of a flute, chips removed by the insert threads will be trapped and compacted in the flutes to a density substantially duplicative of the density of undisturbed material contiguous to the compacted chips thereby to lock the insert in the recess.

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