发明名称 |
Multi-stage hydraulic stretcher for elongated fasteners |
摘要 |
Hydraulic device for exerting a pre-stressing traction on bolts or pins comprises three stages, with each stage comprising a piston within a chamber. The thickness of the skirts of the piston increases from stage to stage in proportion to the pressure to which the piston of that stage is subjected during a stretching operation.
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申请公布号 |
US4074890(A) |
申请公布日期 |
1978.02.21 |
申请号 |
US19760735780 |
申请日期 |
1976.10.26 |
申请人 |
SKF COMPAGNIE D"APPLICATIONS MECANIQUES |
发明人 |
BOUDET, GEORGES;CHARPENTIER, JACQUES;VINEL, RENE;DESMOULINS, JEAN-CLAUDE;DE BLIC, EMMANUEL |
分类号 |
B25B29/02;G21C13/093;(IPC1-7):E21B19/00 |
主分类号 |
B25B29/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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