专利名称：Method and apparatus for tightening and/or
slackening bolts
发明人：Michel Galard申请号：US06/933484申请日：19861121公开号：US04829650A公开日：19890516
摘要：The invention relates to a method and to apparatus for tightening andslackening 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 thepressure effectively applied to the tightening system (60). A correlation between theeffective strain of the bolt and the pressure effectively applied is thus effected forobtaining a very good precision of the strain. Application is to mechanical construction inthe nuclear environment.
申请人：EG&G SEALOL
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