| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastener for pulling a wooden board and a metal board to each other to fasten them together for fixation. SOLUTION: This fastener has a narrow and long shaft part having a first end and a second end. The first end is formed with a boring tip part having a boring projecting end and an axial length. The second end is formed with a wide head part. The shaft part includes a screw part and a non-screw part, and the screw part is extended in the axial direction from the boring tip part to the head part, and includes a spiral screw thread, and has an axial length, a root diameter and a screw thread diameter. Length of the screw part is formed larger than the length of the boring tip part. The non-screw part is extended in the axial direction from the screw part to the head part, and has an axial length and a diameter. The length of the non-screw part is formed practically larger than the length of the screw part, and a diameter of the non-screw part is formed smaller than the diameter of the screw thread. COPYRIGHT: (C)2004,JPO
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