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Fastener tension monitoring system

  • US 8,893,557 B2
  • Filed: 01/09/2013
  • Issued: 11/25/2014
  • Est. Priority Date: 01/09/2013
  • Status: Expired due to Fees
First Claim
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1. A fastener tension monitoring system, comprising:

  • a threaded bolt having a head and an elongate shank extending from the head, wherein the elongate shank comprises a proximal grip length portion and a distal portion, the distal portion being threaded and the proximal grip length portion being smooth;

    piezoelectric material disposed only along the proximal grip length portion of the shank and terminating at an interface between the proximal grip length portion and the distal portion;

    an impedance reader, microcontroller, and transmitter disposed atop the head of the bolt, the impedance reader, microcontroller, and transmitter communicating electrically with the piezoelectric material; and

    an electrical energy storage device disposed atop the head of the bolt, the electrical energy storage device communicating electrically with the impedance reader, microcontroller, transmitter, and piezoelectric material.

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