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Load indicating fasteners

  • US 5,222,849 A
  • Filed: 03/02/1992
  • Issued: 06/29/1993
  • Est. Priority Date: 02/10/1992
  • Status: Expired due to Fees
First Claim
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1. A load indicating fastener comprising a body having a shank which is subject to tensile loading in use, the body having a bore which extends axially from an end face of the body into the shank and which is adapted to receive a gauge pin, the gauge pin having a threaded portion adapted to engage a complementary threaded portion of the bore so that rotation of the gauge pin effects axial movement between the gauge pin and the body of the fastener, the threaded portion of the gauge pin being spaced from a part of the gauge pin which is adapted to contact part of the body of the fastener to stop movement of the gauge pin as it is screwed into the body of the fastener, the gauge pin protruding outwards beyond the end face of the fastener and having a head by which the pin can be rotated, and markings being provided on the head and the end face of the fastener to indicate the position of the gauge pin when the said part of the pin is in contact with the said part of the bore when the shank of the fastener is subject to a predetermined tensile loading, the gauge pin being free to rotate so that the gauge pin can be withdrawn from the fastener by rotating the pin to release the engagement between the threaded portion of the pin and the complementary threaded portion of the bore.

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