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Fastening means for flexible material

  • US 4,233,715 A
  • Filed: 06/29/1978
  • Issued: 11/18/1980
  • Est. Priority Date: 06/29/1978
  • Status: Expired due to Term
First Claim
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1. Fastening means for flexible material comprisinga male portion consisting of a generally flat base havinga circular shank projecting perpendicularly therefrom, after passing through an opening in the flexible material said shank having a first portion of a given diameter extending from the flexible material followed by a tapered shoulder to a second portion having a smaller diameter and terminating at a head which has a first surface that extends abruptly outwardly at a 90°

  • angle from the smaller shank portion and a second surface which is curved from a central top to the outer periphery of the surface and;

    an integral on piece female portion adapted to interlock with the male portion comprising a circular outer ringhaving equidistantly spaced bars which project radially inwardly therefrom terminating in upward extensions thereof and in a continuous downwardly extending annular ring, said upward extensions being inclined inwardly and curved on the inside surface so that the space enclosed by the end of the upward extensions is a circle of approximately the same diameter as the smaller portion of the shank thus enabling the upper extensions to expand over the shank head and snap permanently into place around the shank;

    said continuous downwardly extending annular ring being in substantially the same inclined plane as the upward extensions and adapted to pass through an opening in the flexible material to be fastened and then flared outwardly to form a lip which secures the flexible material between the outer ring and said outwardly flared lip.

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