Method and apparatus for fastener tension inspection

Details Method and apparatus for fastener tension inspection Method and apparatus for fastener tension inspection

1973-08-20

1976-06-15

Ruehl, Charles A.

Measuring and testing

Ductility or brittleness

73139, G01L 524

Patent

active

039629104

ABSTRACT:
A fastener tension inspection system for use with torque producing power tools such as nut runners, screwdrivers, or the like. The inspection system includes a means for measuring torque or other tension proportional function applied to a fastener and a means for measuring at least one additional parameter associated with fastener tightening; for example, time or rotation. With appropriate electronic circuitry, the torquing cycle is started by freerunning the fastener and bringing it up to a predetermined low level of torque sufficient to seat the fastener. Upon reaching the predetermined low level of torque, the means for measuring the additional parameter is initiated and continues until final torquing is completed. The predetermined minimum torque level on the fastener must be reached and a predetermined maximum torque level not exceeded within a predetermined range of the additional parameter or the fastener is rejected. The system is capable of detecting such common fastener defects as insufficient final torque, cross-threading, defective threads or thread stripping.

REFERENCES:
patent: 1985916 (1935-01-01), Coates et al.
patent: 2756622 (1956-07-01), LaBelle
patent: 3368396 (1968-02-01), Van Burkleo et al.
patent: 3440869 (1969-04-01), Hardiman
patent: 3606664 (1971-09-01), Weiner
patent: 3643501 (1972-02-01), Pauley
patent: 3693726 (1972-09-01), Hornig et al.
patent: 3745820 (1973-07-01), Weiner

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