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Self locking fastener

  • US 5,122,020 A
  • Filed: 04/23/1990
  • Issued: 06/16/1992
  • Est. Priority Date: 04/23/1990
  • Status: Expired due to Fees
First Claim
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1. A reusable self-locking metallic fastener comprising a body and a thread convolution formed on said body about a central axis, said thread convolution being adapted for engagement with a mating thread convolution, said thread convolution on said body including axially spaced thread crests and interposed troughs between the crests, means disposed on said thread convolution on said body for providing an interfering locking engagement with the mating thread convolution and retard relative rotational movement between said thread convolution on said body and the mating thread convolution and to effectively lock the thread convolutions together, said means for providing an interfering thread locking engagement comprising a metallic path having at least one layer of metallic material having a lower modulus of elasticity than said thread convolutions metallurgically bonded to said fastener body and extending axially over surfaces defining a plurality of said crests and substantially bonding to at least one of said troughs and one of said crests, said patch having an effective circumferential extension between about 10°

  • and about 180°

    , said patch extending radially outwardly from said thread convolution on said body to engage said mating thread convolution when said thread convolutions are in threaded engagement at a point axially coincident with said patch.

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