| 摘要 |
The invention is directed to a peel-type blind rivet assembly ( 110 ) for setting in relatively soft material and comprising an elongate tubular body ( 102 ) having a shank ( 106 ) with an enlarged head ( 108 ). A free end ( 114 ) of the shank, remote from the head ( 108 ), has an expandable portion formed by a plurality of slots ( 112 ) extending partway along the shank from this remote end ( 114 ). A mandrel ( 104 ) has a stem, and a mandrel head ( 126 ) with a maximum external diameter greater than the internal diameter of the body ( 102 ), wherein at least one of the plurality of slots ( 112 ) increases in width as it extends from an outer surface of the shank towards an inner surface of the shank. There is also provided a punch ( 280 ) for forming the tapered slots ( 112 ) in the rivet body, comprising an elongate solid body having a polygonal cross section wherein at least one convergence zone formed on an end face of the punch by the tapering convergence of two adjacent side walls forms a slot cutting element ( 285 ).
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