The Boeing Company

Jeremy W Sibley

Shawn M Arnett

A cartridge mechanism for monitoring a clamping force of a temporary fastener includes an inner assembly, an outer assembly, and a displacement indicating system. The inner assembly has an inner cap and an inner spring. The outer assembly has an outer cap and an outer spring. The displacement indicating system indicates an amount of compressive displacement of the inner and outer springs that represents attainment of a preliminary clamping force exerted on the structure by the temporary fastener. The inner spring is uncalibrated and has a spring constant substantially equal to that of the outer spring, which is calibrated to one-half the preliminary clamping force at the amount of compressive displacement indicated by the displacement indicating system. The outer assembly is removable from the inner assembly to result in a final clamping force exerted by the temporary fastener on the structure of approximately one-half the preliminary clamping force.

Growing community of inventors

Auburn, WA, United States of America

Jeremy W Sibley