Load sensing system including RFID tagged fasteners

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress

Reexamination Certificate

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C073S849000

Reexamination Certificate

active

07412898

ABSTRACT:
A fastener or other structural component for wireless sensing of applied tensile load. The fastener includes an elongate body with a bore that extends within the body. A grounding pin is positioned within the bore and attached to the body within the bore. The fastener includes a wireless transponder, such as a radio frequency identification (RFID) transponder or tag, that is mounted on a head provided at the end of the body and exposed to the bore, such as by positioning the RFID tag in a recessed surface of the head or extending the bore through the head. The transponder generates a response signal with a unique identifier in response to a radio frequency signal from a transmitter. The grounding pin contacts and grounds the transponder to block transmittal of the response signal when a tensile load applied to the fastener is less than a minimum tensile load value.

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