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High performance sleeved interference fasteners for composite applications

  • US 7,695,226 B2
  • Filed: 09/21/2006
  • Issued: 04/13/2010
  • Est. Priority Date: 09/21/2006
  • Status: Active Grant
First Claim
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1. A sleeve interference fastener adapted to be installed in a hole of a structure comprising:

  • a.) a sleeve having an enlarged head at one end and a tubular portion, the tubular portion having an inner diameter and an outer diameter, wherein the outer diameter of the tubular portion is less than an inner diameter of the hole of the structure and wherein a surface of the inner diameter of the tubular portion comprises a low friction coating;

    b.) a pin member having an enlarged pin head at one end a locking portion at an opposite end, a shank portion therein between, and the shank portion, located below the enlarged pin head, has a diameter greater than the inner diameter of the tubular portion of the sleeve; and

    c.) a tubular locking member adapted to fit over the locking portion of the pin member;

    d.) the structure comprises a composite material and having the hole, wherein the inner diameter of the hole includes a sealant;

    e.) wherein the sleeve is adapted to expand radially over the shank portion to form an interference fit between the outer diameter of the sleeve and the hole of the structure so as to provide an installed position; and

    f.) wherein, in the installed position, the low friction coating covers a shank contact surface of the surface of the inner diameter of the sleeve and wherein the shank contact surface is defined when the pin member is installed within the sleeve, adapted to result in;

    (i) coefficient of friction between the shank contact surface of the surface of the inner diameter of the sleeve and the shank portion of the pin member having X,(ii) a coefficient of friction between a surface of the outer diameter of the sleeve and the inner diameter of the hole of the structure having Y, and(iii) wherein X is consistently maintained less than Y when the shank portion is moved within the sleeve.

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