| 摘要 |
<p>A screw, particularly a wood screw which has a threaded cylindric stem (10, 110) merging, over an inversely frustoconical part (16, 116) with an enlarged diameter cylindric portion (20, 120) which is integral with an underside of a large diameter washer section (23, 123) which, in turn is integral with a shallowly convex head portion (25, 125). The invention is intended for wood screws usually in the range of about 6 mm and provides a reduced chance of injury by providing a smooth merging with the flat surface on which the screw head is located. Also, the screw has an improved torque characteristics making it suitable for use with power screw driving tools. Another advantage is in that due to a reduced specific pressure under the head of the screw, the damage to the surface of a workpiece due to a strong tightening of the screw is reduced.</p> |
