Simplified apparatus for and method of tightening fasteners

G - Physics – 05 – D

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341/108, 81/20

G05D 15/01 (2006.01) B25B 23/14 (2006.01)

Patent

CA 1091329

SIMPLIFIED APPARATUS FOR AND METHOD OF TIGHTENING FASTENERS By: Angelo Tambini & Paul W. Wallace ABSTRACT OF THE DISCLOSURE The invention disclosed herein relates to a tighten- ing system for tightening an assembly including a threaded fas- tener including a wrench for applying torque and imparting ro- tation to the fastener. Associated with the wrench is a con- trol system including measuring means for developing a first signal representative of the angular displacement of the fas- tener. A second signal representative of a constant incremen- tal time is introduced along with the first signal to gradient calculating means which develops a signal representative of the slope or gradient of an angular speed vs. angular displacement curve which could be plotted for the particular assembly being tightened. When the gradient signal falls to a predetermined percentage of a maximum previously stored gradient signal, at the yield point of the assembly or some similarly significant point characterized by a significant change in slope on the an- gular speed vs. angular displacement curve, a control signal is generated stopping the tightening of the assembly.

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