Method of calibrating a torque testing device and a magnetic cal

Details Method of calibrating a torque testing device and a magnetic cal Method of calibrating a torque testing device and a magnetic cal

1987-01-20

1988-08-09

Ruehl, Charles A.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

81473, 310103, G01L 2500, H02K 4910

Patent

active

047619899

ABSTRACT:
A hand operable calibration device for calibrating or re-calibrating a spring type torque tester, the device having first and second partially overlapping members with bearings therebetween to permit relative rotation between the first and second members. The first and second members are provided, respectively, with first and second annular permanent magnets which are spaced apart and which overlap one another to create a magnetic drag of reproducible magnitude against the relative rotation between the first and second members. One of the members is grasped by the jaws of the torque tester that is being calibrated or re-calibrated, a torque is applied to the other member to overcome the magnetic drag against the relative rotation between the members and the level of torque needed to cause relative rotation between the first and second members is compared to the torque reading indicated by the torque tester at the time such relative rotation begins. A third member can be provided to permit selective adjustment in the degree of overlap between the first and second annular permanent magnets to permit the calibration or re-calibration of the torque tester at different torque levels.

REFERENCES:
patent: 2603678 (1952-07-01), Helmer
patent: 2618186 (1952-11-01), Mayer
patent: 2722617 (1955-11-01), Cluwen et al.

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