| 摘要 |
IMPROVED SCREW HEAD A fastening system according to the present invention comprises a screw component (10) and a seating component (20). The screw component comprises a shaft (12) extending along a longitudinal axis (5) and having a maximum radius RI, said shaft comprising a threaded section (13), said screw component further comprising, at one end of the screw shaft, a head (14), the head comprising a bottom end (15) having a larger maximum radius R2 than the screw shaft such that an exposed underside (18) of the screw head extends radially beyond the maximum radius of the screw shaft. The seating component comprises a screw channel (21) comprising a planar screw seat (22) having a minimum radius R3 which is equal to or greater than R1. The bottom end of the screw head comprises an annular contact surface for abutment against said screw seat, the contact surface being formed by the distal end of at least one downwardly extending protrusion (17) on the underside of the screw head, wherein the annular contact surface has a minimum radius greater than the minimum radius of the screw seat. |
