Patent ID: 7985040

Claim:
A screw assembly, comprising: a substantially hollow first screw defining a receiving hole, wherein the first screw forms a first threading on an outer surface of the first screw, two notches are defined in the first screw, communicating with the receiving hole; and a second screw smaller than the first screw in size, the second screw comprising a second head, and the second head defining a first slot transversely extending through the second head, wherein the second screw is adapted to be received in the receiving hole to engage with the first screw, opposite ends of the first slot align and communicate with the two notches; the first screw comprises a first shaft and a first head extending from an end of the first shaft, the second screw comprises a second shaft extending from an end of the second head, the first threading is formed along a circumference of the first shaft of the first screw, the notches are defined in a top surface of the first head, aligned with each other; the first slot and a second slot are orthogonally defined in a top surface of the second head.