| 摘要 |
A fastener having a shank portion (11), at least part of the shank portion being provided with a screw thread (14), an head portion (12) at one end of the shank portion and a tip portion (13) at the other end of the shank portion wherein the screw thread does not extend to the tip portion. The tip portion is substantially symmetrical about the axis of the shank portion, and may be pointed and/or conical, with a generally smooth outer surface. The head portion has a recess therein, such as a single elongate slot or a cruciform formation (26), to enable the fastener to be rotated by an appropriate tool. Since the screw thread does not extend to the tip portion, the fastener may be inserted into a material by hammering, while the form of the thread prevents removal of the fastener from the material other than by application of rotational movement. The fastener may thus be inserted into a material rapidly, without the necessity of imparting rotational movement to the fastener. |
