Method of tightening threaded fasteners

Details Method of tightening threaded fasteners Method of tightening threaded fasteners

1985-06-11

1987-08-04

Ruggiero, Joseph

Boots, shoes, and leggings

73761, 81467, 173 12, 364508, G05B 1302, G05D 1702

Patent

active

046850503

ABSTRACT:
The invention is directed to a method for tightening threaded fasteners by means of a controlled fastener-driving tool. The tightening of the fasteners is controlled by the elastic limit thereof. The slope of the actual load-strain characteristic curve is continuously determined during the fastener-driving operation. This actual slope is compared with a predetermined slope determined with reference to a characteristic curve. When the predetermined slope is reached, a control signal is generated to switch off the fastener-driving tool. In practice, departures occur in the actual characteristic curve of an actual fastener-driving operation. In order to compensate for such departures from the characteristic reference characteristic curve, a comparison is made in the straight portion of the actual load-strain characteristic curve with the predetermined characteristic slope of the reference characteristic curve and a corrective value for transformation of one characteristic curve to the other is formed in the presence of a departure of the slopes. For this purpose, before the actual determined slope is compared with the predetermined switch-off slope one of the two quantities is transformed by means of a corrective value.

REFERENCES:
patent: 4106176 (1978-08-01), Rice et al.
patent: 4245381 (1981-01-01), Esghy
patent: 4344216 (1982-08-01), Finkelston
patent: 4375121 (1983-03-01), Sigmund
patent: 4426887 (1984-01-01), Reinholm et al.

Affiliated with

Also associated with

Rating

Method of tightening threaded fasteners does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of tightening threaded fasteners, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of tightening threaded fasteners will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-887187