| 摘要 |
<p>BLIND FASTENER A blind fastener for fastening an apertured workpiece of frangible material comprises a tubular body (12) having a shank (18) with a head (20) at one end and a tapering nose (22) at the other end, and means (14, 16) for forming a blind head by which the workpiece can be engaged at a position spaced radially from the shank (18) and clamped to the head (20). The means for forming the blind head comprises a sleeve (16) and a headed bolt (14) whereby the sleeve (16) can be forced over the nose (22) of the body (12) and, thereby expanded. A region (46) of the nose (22) immediately adjacent to the shank (18) is tapered at a sufficiently large angle to cause the leading portion of the sleeve to be permanently expanded to an internal diameter substantially greater than the external diameter of the shank, and the nose (22) has a less steeply tapered region (44) whereby the sleeve (16) is first radially expanded at a slower rate than by the region (46). The tapering regions (44, 46) can each be frusto conical or can be provided by a continuous concavely curved surface. The bolt (14) is in screw-threaded engagement with the body (12) so that, on rotation of the bolt; the sleeve (16) will be forced over the nose (22). (Figure 1)</p> |
