| 摘要 |
A temporary fastener (10) that fastens two adjacent workpieces (40, 42). The fastener includes a shank (12) that extends through a hole of the workpieces (40, 42). Extending from one end of the shank is a conical shaped head (20). The fastener also contains a pull stem which has a head (28) located adjacen t to the blind end of the shank. The stem head (28) is pulled through the shan k (12) to expand and tightly fasten the shank (12) to the workpieces (40, 42). The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill bit (54) so that part of the head (20) does not become attached to the drill bit and scratch the workpiece (40). The conical shape of the head also reduc es the volume of the fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank preven ts the fastener from rotating during the drilling operation. |
