Method and apparatus for tightening and/or slackening bolts

Details Method and apparatus for tightening and/or slackening bolts Method and apparatus for tightening and/or slackening bolts

1986-11-21

1989-05-16

Eley, Timothy V.

Metal working

Method of mechanical manufacture

With testing or indicating

29703, 29705, 29240, 29252, 29709, 29720, B23Q 1700

Patent

active

048296503

ABSTRACT:
The invention relates to a method and to apparatus for tightening and slackening bolts by hydraulic tensioning. The apparatus comprises a tightening system (60) applied to the bolts to be tightened and/or slackened, controlled by a central unit (24), via the intermediary of a control device (26) and a hydraulic pump (28). Transducers (19 and 18) permit respectively measurement of the effective strain of the bolt and the pressure effectively applied to the tightening system (60). A correlation between the effective strain of the bolt and the pressure effectively applied is thus effected for obtaining a very good precision of the strain. Application is to mechanical construction in the nuclear environment.

REFERENCES:
patent: 3099075 (1963-07-01), McDaniels, Jr. et al.
patent: 4047456 (1977-09-01), Scholz
patent: 4520446 (1985-05-01), Sato

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