G - Physics – 05 – D
Patent
G - Physics
05
D
341/108.1
G05D 15/01 (2006.01) B25B 23/145 (2006.01)
Patent
CA 1098196
8122 IR-TH METHOD AND APPARATUS FOR FASTENER TENSIONING Abstract of the Disclosure A fastener tensioning method and apparatus for obtaining a desired degree of tension in a fastener. The apparatus includes a means for applying rotation to a fastener, a means for measuring the torque applied by the means for rotating the fastener, a means for determining a rate of change of torque applied to the fastener with respect to the rate of change of rotation applied to the fastener, a means for detecting when the rate of change of torque with respect to the rate of change of rotation becomes a constant, a means for accomplishing a desired amount of rotation of the fastener beyond the rotation required to achieve the constant rate of change of torque with respect to rotation, and a means for shutting off the means for applying rotation to the fastener in response to the total desired rotation being achieved. The embodiment herein described improves the well-known "turn of the nut" method for fastener tensioning by providing that method with a well determined starting point.
294378
Ingersoll-Rand Company
Swabey Ogilvy Renault
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