SCREW FOR ENHANCING SAFETY AND DRIVER DEVICE FOR THE SCREW

摘要

One screw is used to enhance safety and a driver device by manufacture screw in the while frictional force in region that is contacted for being arranged to discharge a screw and smoothing to reduction wherein a head of screw unit and driver. One screw includes: a head unit (120), has an oval shaped portion; One threaded shank (140) is integrally formed in the lower part of head unit; One coupling unit receives the head unit of screw; One surplus units (240) are rotated around coupling unit. The side of head unit has an even surface. Coupling unit and surplus units are connected a longitudinal direction and around an axis or a nonidentical axis rotations.