Sealing fastener with ultrasonic identifier and removal attempt indicator, and ultrasonic reading device for same
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United States of America Patent
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Sep 15, 1998
Issued Date -
N/A
app pub date -
Aug 19, 1997
filing date -
Sep 3, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A sealing fastener includes a unique identifier device for the individual fastener that enables ultrasonic identification of the device using an ultrasonic fault measuring system, and a frangible element within the fastener integrated with the identifier device that provides an ultrasonic signature indicating an attempt to loosen or remove the fastener when subjected to an ultrasonic signal generated by an ultrasonic fault measuring system. The unique identifier device includes a stack of individual metallic washer elements brazed together, with each washer element including discontinuities or cavities that are randomly arranged with respect to the cavities of the other washers in the stack. The fastener includes relatively movable portions that cause fracture of the frangible element upon any attempt to loosen or remove a fastener after it has been tightened or secured at its sealing location. An ultrasonic reading device includes an adapter that cooperates with the fastener to precisely locate an ultrasonic transducer with respect to the identifier and indicator so that a signature of the identifier and the indicator can be obtained in a single step using a single ultrasonic reading head associated with an ultrasonic fault detector system.
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