Power-impact or pulse screwing method

Details Power-impact or pulse screwing method Power-impact or pulse screwing method

1994-10-24

1996-02-27

Chilcot, Richard

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Threaded fastener stress

73814, 73847, B25B 2314, B25B 2100

Patent

active

054939135

ABSTRACT:
A method for tightening a screw utilizes a power-impact or pulse driver. The prestressing force in the screw to be tightened is increased step-by-step during the tightening operation and evaluated. By detecting the prestressing force in the screw on a step-by-step basis, the step heights pertaining to the increase in the prestressing force and the change in the step heights are used as criteria for the screw-coupling quality and for controlling the screw-coupling operation. In the same way, the number of impacts or pulses is also used as a criterion for the screw-coupling quality and for controlling the screw-coupling operation.

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patent: 5216622 (1993-06-01), Kibblewhite et al.
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