| 摘要 |
A fastener for joining sheet material having mating perforations, the fastener including a grommet(1) and stud; the grommet having a head(2) provided with an opening therethrough and a pair of spreadable stem elements, the stud being initially attached at one end integrally to the grommet within the opening and arranged, when severed from the head, to move between the stem elements and to rotate thereby to spread the stem elements and lock the grommet in place within the mating perforations; the stud having a retainer channel and the grommet having retainer projections for reception in the channel to prevent disengagement of the stud from the grommet after being severed therefrom for relative movement.
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