| 摘要 |
<p>The invention provides a fastener for use as a substitute for spot-welding and the like joining of sheet metal components, which is self-punching and self-clinching so that it can be installed by a single press operation, the fastener comprising a head and a shank, a groove around the shank towards the piercing tip of the same, and being used in combination with an installing tool or die which supports the components and surrounds the area to be punched out, the tool having an upstanding rib which embeds in the lower component to cause flow of metal into the groove.</p> |
