| 摘要 |
A quick-fastening nut for location on an associated bolt comprises a plurality of internally-threaded, arcuate segments (2,4), each including a part frusto-conical portion (6,8), guide means (14,18) reacting between the segments (2,4) whereby said segments (2,4) can be moved radially towards and away from one another between inoperative positions displaced outwardly of concentricity and operative positions substantially concentric with one another and with a frusto-conical surface presented by said portions (6,8). The nut further comprises releasable means (26) for retaining the segments (2,4) in their operative positions, the arrangement being such that, in use, the frusto-conical surface defined by said portions (6,8) engages a correspondingly-shaped mating surface of a component, such as the piston (40) of a hydraulic bolt tensioner or a washer, bounding the bolt, relative axial movement between the nut and said component urging the segments (2,4) radially inwardly into positive threaded engagement with the bolt. |
