Curvilinear drive screwdriver and screw

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