| 摘要 |
A method and fastener for fastening one or more apertured members ( 48 ) to an apertured workpiece ( 52 ), an aperture ( 50 ) of the or each member ( 48 ) being aligned with an aperture ( 54 ) in the workpiece ( 52 ), the method comprising the steps of inserting a fastener ( 10 ) into the aligned apertures, the fastener ( 10 ) being formed of ductile material and having a head ( 14 ), a shank ( 12 ), and an axial bore ( 22 ) extending through the shank ( 12 ) and into the head ( 14 ), the shank ( 14 ) being circumferentially entire and being formed with an external screw-thread ( 18 ) the fastener ( 10 ) being inserted so that the head ( 14 ) engages a face of the one member ( 48 ), and the shank ( 12 ) extends through the member ( 48 ) or members and into the workpiece ( 52 ), and at least a part of the screw-thread ( 18 ) is within the workpiece ( 52 ), and then, while supporting the fastener ( 10 ) at the head ( 14 ), drawing into and entirely through the bore ( 22 ), in the direction from the tail portion to the head ( 14 ), a tapering, enlarged, mandrel head ( 32 ) capable of expanding the bore ( 22 ) and thereby enlarging the bore ( 22 ) evenly throughout its length and causing ductile radial expansion of the shank ( 12 ) sufficient to case the external screw-thread ( 18 ) to embed in the workpiece ( 52 ) and the shank ( 12 ) of the fastener ( 10 ) undergoing ductile axial reduction in length.
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