Patent ID: 6302631
Filing Date: 2001-10-16
Classification: F16B

Abstract:
A wood screw comprising a shank having a pointed tip at one end and a head at the other end and formed with threads, said head having a shape of a square pyramid having four ridges and four side faces respectively defined between adjacent pairs of said four ridges, said head having a top surface formed with a recess for accepting a tip of a screw driving said recess is cross-shaped and comprises four grooves extending toward said four ridges, respectively, and having bottom surfaces inclined at substantially the same angles as said four ridges, respectively, wherein rake faces are formed along and in front of said four ridges, respectively, with respect to the direction of rotation of the wood screw, said rake faces being inclined, as viewed from above said head of the screw, radially inwardly with respect to said four side faces, respectively.