| 摘要 |
PURPOSE: A power screw nail is provided to improve shearing strength of the power screw nail by forming screw sections having different incline angles at an outer peripheral portion of the power screw nail. CONSTITUTION: A power screw nail(20) includes a shank section(25) and a head(26). The shank section(25) is formed on an upper portion of the power screw nail(20). The power screw nail(20) has a nail body formed with screw coupling sections(22,23). The screw coupling sections(22,23) are symmetrically formed about an interfacial line. A thread portion(22') of the screw coupling section(22) is opposite to a thread portion(23') of the screw coupling section(23). Since the thread portions(22',23') are opposite to each other, the power screw nail(20) is prevented from being released even if vibration is applied.
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