| 摘要 |
<p>A tensioning nut comprising a body (1, 31) which screws onto a threaded part of an article, has one or more stacks of compressible components (3, 33) located with regard to the longitudinal axis of the nut. The or each stack acts in use of the nut on an item connected to the screw-threaded part. The compressible components (3, 33), preferably Belville washers, are compressed and held releasably compressed by load retaining means. The nut may be a hydraulic tensioning nut with a piston (2) which acts on the item, the body and piston being urged apart by hydraulic pressure to tension the screw-threaded part connected to the item. In this case the compressible components compress under the hydraulic pressure applied between the body (1) and the piston (2). This allows enhanced relative movement between the body and piston under the hydraulic pressure before retention means (4) is operated to retain the body and piston in positions to which they have been hydraulically urged.</p> |
