| 摘要 |
PURPOSE:To reduce a large period of time and amount of labor, by forming a cut-out edge at a tip of a wood screw for easy screwing during the screwing of it to make a guide hole by the cut-out edge. CONSTITUTION:A cut-out edge is formed at a tip of a wood screw for easy screwing during the screwing of it. In order to form a cut-out edge, a chipped off portion 1 is provided. Angle of chipping off 2 is determined as 30 degrees. Owing to the cut-out edge formed at the tip of the wood screw, a guide hole is made by the cut-out edge before the screw is intruded inward, the screwing can thus be done with the far less power to make the screw intrude inward. In this way, time and labor can be enormously saved. |
