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    • 9. 发明申请
    • UNTIGHTENING PREVENTIVE SCREW
    • 坚持预防性螺丝
    • WO1992011467A1
    • 1992-07-09
    • PCT/JP1991001724
    • 1991-12-17
    • O S G CORPORATIONKABUSHIKI KAISHA SUZUKI RASHI SEISAKUSHOO S G M F G. COMPANYSUZUKI, Yasuo
    • O S G CORPORATIONKABUSHIKI KAISHA SUZUKI RASHI SEISAKUSHOO S G M F G. COMPANY
    • F16B25/00
    • F16B39/30F16B25/00
    • A tapping screw capable of being easily driven into a thick wall material reliably prevented from untightening in order to use it as a stud bolt and the like. Main threads (2, 2') are dividedly formed on the distal end and the proximal end of a tapping screw, and auxiliary threads (3) opposite in direction to the main threads are provided therebetween. The outer diameter of the auxiliary threads (3) is substantially equal to the diameter of a prepared hole, and the gradient of the slope of the auxiliary threads is formed such that the gradient is gentle at the slope (3a) on the tightened side and sharp on the slope (3b) on the untightened side. The main threads (2) on the distal end are driven in as a tapping screw, and subsequently, the oppositely directed auxiliary threads (3) are driven in like a wedge, and finally, the main threads (2') on the proximal side are driven in. Since the main threads and the auxiliary threads are formed separately from each other, the drive-in torque becomes not large, and, even if a torque in the untightening direction acts on after tightening, the auxiliary threads (3) work against this action to thereby prevent untightening.
    • 能够容易地驱动到厚壁材料中的自攻螺钉被可靠地防止脱开,以将其用作双头螺栓等。 主螺纹(2,2')分别形成在自攻螺钉的远端和近端,并且在其间设置有与主螺纹相反的辅助螺纹(3)。 辅助螺纹(3)的外径基本上等于预制孔的直径,辅助螺纹的斜率梯度形成为使得梯度在紧固侧的斜面(3a)处平缓,并且 在不受干扰的一侧的斜坡(3b)上是锋利的。 远端的主螺纹(2)作为自攻螺钉被驱动,随后相反方向的辅助螺纹(3)以类似楔形的方式被驱动,最后在近侧的主螺纹(2') 由于主螺纹和辅助螺纹彼此分开形成,所以驱动转矩变得不大,并且即使紧固后的紧固方向的扭矩起作用,辅助螺纹(3)工作 反对这一行动,从而防止不合身。