| 摘要 |
<p>This invention relates to an improved blind fastener assembly (18) and an improved joint assembly using the blind fastener assembly. The blind fastener assembly (18) is adapted to be installed in a workpiece (10) having a first and a second surface (11,12) with an opening (13) therebetween. The blind fastener (18) is of the type having a core pin (19), expander means (20), expandable sleeve means (21), and resilient washer means (22), each having an initial diameter which permits it to pass through the opening (13) in the workpiece (10). The improvement in the blind fastener assembly (18) in accordance with this invention comprises the washer means (22) having two portions including an inner portion (38) and an integrally formed outer flange portion (39). The inner portion (38) has a tapered nose section (40) tapering outwardly away from the core pin shank portion to facilitate expansion of the sleeve means (21) over the inner portion. The integrally formed outer flange portion (39) is adapted to be unfolded by the sleeve means (21) to form a bearing surface against the second surface (12), of the workpiece (10). Advantageously, the washer means inner portion (38) is thick-walled and the outer flange portion (39) is thin-walled. Furthermore, the washer means (22) outer flange portion (39) has a wall thickness of generally from about 0.2 to about 0.5 times the combined wall thicknesses of the washer means (22) inner portion (38) and outer flange portion (39). The washer means (22) can also have a leading internal surface inclined outwardly to facilitate the expansion of the washer means (22) over the expander means (20) tapered nose portion (30). <IMAGE></p> |
