Boots – shoes – and leggings
Patent
1992-04-03
1994-05-24
Smith, Jerry
Boots, shoes, and leggings
364153, 364508, 7386223, 81467, 173176, 173181, G05B 1302
Patent
active
053155017
ABSTRACT:
A system and method for compensating for torque overshoot in a rotary power tool wherein the tool is shut off at an adjusted set point value of torque which is below the target value of torque by the amount of torque overshoot. While the tool is operated to perform a fastening job, the relationship between the torque rate in the fastening job to overshoot in the tool is determined, the torque rate in the job is monitored while the tool is setting the job, and the torque set point is adjusted while the tool is setting the job to compensate for the torque overshoot determined from the foregoing relationship. The relationship between torque rate in the fastening job and overshoot in the tool follows the expression Y=K/X where Y is the overshoot, X is the deceleration time required to tighten the fastener and K is a constant determined by using the measured deceleration time and torque overshoot during a previous high torque rate job in the foregoing expression, the deceleration time being measured between the same selected fractional values of the target torque. During a subsequent fastening job, the deceleration time is measured between the same selected fractional values of target torque, the overshoot is calculated from the foregoing mathematical expression using the previous value of K, and the torque set point is adjusted to compensate for the calculated value of overshoot. The foregoing is performed job-to-job developing a running average of the constant K. While the use of torque-time rates is preferred for simplicity and economy, the use of torque-angle rates also is contemplated.
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A Primer On Setting Threaded Fasteners by Hugh L. Whitehouse, May 25, 1991.
Gordon Paul
Smith Jerry
The Stanley Works
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