| 摘要 |
The pin (11) is rectangular, and has a central axis (CL) and a cover surface. It has a longitudinal hole (14) extending parallel with the central axis, and at least one channel (18) is formed in its pointed end (13). This channel connects to the longitudinal hole and to the cover surface of the pin. The channel (18) forms an acute angle (alpha) with the pin central aixs, and diverges from the central axis in the work direction of the pin. The pointed end of the pin is conical, the base (16) of which has a dia. greater than that of the remainder of the pin, and the channel issues into the conical point. In a further form, four channels are arranged, equally distributed in the pin pointed end, each channel connecting at right-angles to the cover surface of the conical point. |
