| 摘要 |
<p>A male clinch fastener adapted to be secured to a sheet (21) by cold-forming includes a generally cylindrical head (30) having a threaded shaft (31) extending outwardly therefrom and a plurality of circumferentially distributed splines (35a,35b). Longitudinally extending portions of the splines are adapted to be displaced by cold-forming or a peeling action to form a laterally extending flange (40) along a medial portion of the head. The clinch fastener also preferably includes a laterally extending flange (33) at one end co-operating with the cold-formed flange (40) to secure the fastener within a pilot (26), or collar, formed at an opening (25) in the sheet to which the clinch bolt is secured. The splines (35a) adjacent the end flange are also secured within the pilot of the sheet and prevent rotation of the clinch fastener. The head (30) also preferably has a second end portion being tapered to serve as a guide surface to facilitate alignment with the opening (25) in the sheet during installation, and also serves as a guide surface for beginning the cold-forming, or peeling, of the splines to form the flange (33) in the medial portion of the head. <IMAGE></p> |
