| 摘要 |
A reduced-friction screw (1) is described. The screw (1) requires less turning torque than a conventional screw to drive it into a workpiece. The shaft (2) of the screw (1) has a reduced-thickness thread (5) that produces less sliding friction than a conventional screw having thread of the same depth and pitch. In addition, the holding ability of the reduced-friction screw (1) is substantially the same as a conventional screw having thread of the same pitch and depth. Another embodiment contains a shaft (2') having a reduced diameter, to further reduce sliding friction. Yet another embodiment contains a segmented, reduced-thickness thread (41) that resists removal and loosening when the workpiece is subject to twisting, vibration, or warping. To prevent loosening of the reduced-friction screw, the bottom of the screw head may contain protrusions (7) to increase the frictional contact of the head (3) with the workpiece. <IMAGE> <IMAGE> |
