Patent ID: 7647808
Filing Date: 2010-01-19
Classification: G01L

Abstract:
1. An apparatus for calibration of a fluid-operated power torque tool having housing means and drive means, the apparatus comprising a non-turnable torque measuring unit for measuring a torque generated by the tool; a non-turnable abutment unit; first connecting means configured for connecting the drive means of the tool with said torque measuring unit, for measuring a torque generated by the tool when a fluid pressure is applied to the tool; an adjustable braking unit configured for providing an adjustable braking force; second connecting means configured for connecting the housing means of the tool with said adjustable braking unit to apply the adjustable braking force to the housing means so as to increase a turning resistance to turning of the housing means of the tool, so that when the tool is operated the housing means of the tool starts turning at a force determined by said braking unit while the drive means of the tool apply an opposite and equal force to said measuring unit, so that when the braking force is increased a fluid pressure required for the tool increases and the tool can be calibrated, by determining the generated torque that corresponds to the applied fluid pressure, without inertia.