Apparatus and method for measuring the torque applied to bolts
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United States of America Patent
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Aug 2, 2005
Grant Date -
Apr 15, 2004
app pub date -
Oct 15, 2002
filing date -
Oct 15, 2002
priority date (Note) -
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Abstract
An apparatus and method for measuring and recording the torque applied to a bolt. The present invention utilizes a piezoelectric compound disposed between an upper member and a lower member. When the bolt is tightened, the piezoelectric compound is physically distorted and a net electrical potential is created across the piezoelectric compound. A processor in the bolt measures the electrical potential and calculates the torque based on the potential. The bolt then transmits a data packet comprising the torque value and bolt information to a wrench, which later transmits the data packet to a computer and a database. Alternatively, the bolt can be configured with a transmitter so that the data packet can be transmitted directly from the bolt to the computer and database. The bolt can also be configured with energizing circuitry that acts as a power source for the bolt.
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