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Fastening system allowing component removal after fastener system failure

  • US 10,288,106 B2
  • Filed: 06/08/2016
  • Issued: 05/14/2019
  • Est. Priority Date: 07/20/2015
  • Status: Active Grant
First Claim
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1. A fastening system for attaching a cover to an underground vault comprising:

  • a bolt having threads; and

    a composite fiber reinforced polymer nut having an unthreaded thread engagement portion extending through at least a portion of the nut, wherein the unthreaded thread engagement portion forms thread after receiving the bolt and fails in shear before the nut and bolt seizewherein the nut further includes an unthreaded cylindrical bolt alignment portion positioned above the thread engagement portion, andwherein the nut further includes an unthreaded cylindrical bolt shroud section positioned below the thread engagement portion, both the unthreaded bolt alignment portion and the unthreaded bolt shroud section having a diameter greater than a diameter of the unthreaded thread engagement portion and the unthreaded bolt shroud section has an opening below the bolt.

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