| 摘要 |
A fastening device is provided which is suitable for holding large structural members in firm sealing engagement and in alignment with respect to each other and which can be easily placed in assembled position even when it must be employed in a confined area which is difficult of access. The fastening device includes a bolt having threaded portions at each end and an intermediate body portion. The threaded portions are of different pitch to insure insertion in the proper direction. The body portion is formed to include a shank having a shoulder near one end and a relatively wide groove at the other end. A snap ring is placed in the groove. Alternating male and female rings, having abutting tapered edges, are positioned between the shoulder and the snap ring and are parts of the body portion. The female ring is split so that as a longitudinal force is exerted by the shoulder when the fastening device is screwedinto a threaded recess in one of the structural members the female ring is caused to be expanded into firm engagement with the walls of the apertures in which the fastening device is placed. The female ring is positioned to extend across the plane of the abutting surfaces of the structural members so that expansion of the female ring against walls of the apertures corrects any initial misalignment of the apertures and of the structural members. The male rings are solid members and the inside diameter thereof exceeds that of the section of the shank adjacent which the male members are placed. The resulting clearance allows a slight radial shifting of the rings to facilitate easy insertion of the fastening device despite misalignment between the axis of a threaded recess in which one threaded end of the bolt body is received and the axis of the aperture adjacent the threaded recess and despite initial misalignment of the structural members.
|
