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    • 75. 发明授权
    • TAMPERPROOF SCREW, COMBINATION WITH SCREWDRIVER BIT, AND HEADRER PUNCH FOR MANUFACTURING TAMPERPROOF SCREW
    • 防撬螺丝,与螺丝刀头组合,以及用于制造防撬螺丝的顶头冲击器
    • EP1491777B1
    • 2011-01-12
    • EP03743985.8
    • 2003-02-27
    • Totsu, Katsuyuki
    • Totsu, Katsuyuki
    • F16B23/00B25B15/00
    • F16B23/0023B25B13/485B25B15/005F16B41/005
    • A tamperproof screw to which a conventional general screwdriver cannot couple so that screw tightening is prevented reliably, a screwdriver bit that can be simply and quickly coupled to the screw and can reliably prevent a come-out phenomenon during screw tightening, and a header punch for manufacturing the tamperproof screw simply, easily and at low costs. A tamperproof screw (10A) has slope portions (15) extending from opening end edge portions (12a) of bit fitting grooves of a screw head (10a) toward a center part of a screw neck portion (10b), step portions (14) provided at intermediate part of the slope portion, and a conical bottom face (13) formed at the center portion where the slope portions meet. A hole portion (16) having a maximum diameter which is the ones of the opening and edge portions (12a) and an inverted conical trapezoidal shape, extending to the bottom face (13) and adjoining the slope portions except the step portions (14) is formed. The thus structured tamperproof screw (10A), a screwdriver bit matching the screw, and a header punch for manufacturing the tamperproof screw are provided.
    • 现有的一般螺丝刀不能连接的防干扰螺钉可靠地防止了螺钉拧紧,能够简单且快速地连接到螺钉并且能够可靠地防止螺钉拧紧过程中出现脱出现象的螺丝刀头以及用于 简单,容易且低成本地制造防篡改螺钉。 防干扰螺钉(10A)具有从螺钉头(10a)的刀头安装槽的开口端边缘部分(12a)朝向螺钉颈部(10b)的中心部分延伸的倾斜部分(15),台阶部分(14) 设置在斜面部分的中间部分处,以及形成在斜面部分相交处的中心部分处的锥形底面(13)。 具有最大直径的孔部分(16),所述孔部分(16)具有最大直径,所述最大直径是延伸到所述底面(13)并邻接除所述台阶部分(14)之外的所述倾斜部分的所述开口部分和边缘部分(12a)以及倒圆锥形梯形形状, 形成了。 提供如此构造的防篡改螺钉(10A),与该螺钉匹配的螺丝刀刀头以及用于制造防篡改螺钉的头部冲头。