Nail Or Screw Capping Die Patents (Class 470/184)
  • Patent number: 6406376
    Abstract: A screw drive recess mold for forming screw drive recesses which has a body and a mold base. The mold base consists of four symmetrical fan-shaped protrusions and a center square protrusion. Four elongate rectangular hollow spaces are located in each of the middles between every two neighboring fan-shaped protrusions. A compound screw drive recess formed by this drive recess mold can be driven by various conventional drivers such as of a slot, of a Phillips (cross), of a square, of a cross-square, and of a Pozi. With the tailor made screw driver of this compound drive recess, the drive recess will be able not only to withstand high driving torques but also to securely retain the drive bit (the screw driver) within the recess.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: June 18, 2002
    Inventor: Chao-Wei Lin