| 摘要 |
<p>Hydraulically assisted fastener ( 10 ) comprises a body ( 11 ) with a central bore ( 12 ) to engage a connector element ( 20 ) and with an annular recess ( 14 ) opening outwards to an end surface ( 15 ). Annular thrust member ( 17 ) fits into and seals the recess ( 14 ). Charging medium ( 50 ) is injected under pressure into annular chamber ( 30 ) defined by recess ( 14 ) and member ( 17 ) and moves body ( 11 ) relative to member ( 17 ) to tension element ( 20 ). Medium ( 50 ) sets in chamber ( 30 ) to maintain the tension in element ( 20 ). Element ( 20 ) may be a bolt or stud, body ( 11 ) can be a nut and member ( 17 ) can be a plan washer. Medium ( 50 ) can be a curable viscous paste, a suspended solid in a self-setting compound or a particulate solid which behaves as a fluid. Suitable materials include graphite, and lead, copper or steel balls.</p> |
