| 摘要 |
<p>A screwdriver (10) and screw (62) may be used in combination or with conventional screws and screwdrivers. The screwdriver has a head (15) with forward and rearward faces (20, 22). Curved driving surfaces (30, 32, 34, 36) on the faces extend from left and right side edges (26, 24) toward a longitudinal axis (18) of the screwdriver. The screw has a slot (70) with equal and opposite faces (72, 74) which are convex curved surfaces. The screw also has a bottom with protruding retainer lips (94, 96) and shoulders (98, 100) which extend upward along a side edge (80, 82, 84, 86) of each face for maintaining the driver in the slot. The bottom (88) is a convex curved surface.</p> |
