Patent ID: 6609407
Filing Date: 2003-08-26
Classification: G01L

Abstract:
A test apparatus for simulating the behavior of a pre-tightened threaded joint, comprising:a base; a torque sensor that outputs an indication of torque when rotated by a tool to be tested; a rotatable arm connected to the torque sensor and having a rest position; a stop disposed between the base and the rotatable arm that prevents the rotatable arm from rotating past the rest position in a first direction, at least one of the group consisting of the rotatable arm and the stop including a magnet, the magnet causing a magnetic force that attracts the rotatable arm in the first direction toward the rest position when the rotatable arm is at or near the rest position; and at least one elastic member attached to the base and the rotatable arm that urges the rotatable arm in the first direction toward the rest position.