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    • 9. 发明申请
    • TAMPER-RESISTANT FASTENER AND METHOD AND TOOL FOR USE WITH SAME
    • 耐冲击紧固件及其使用方法和工具
    • WO2005042985A3
    • 2005-11-24
    • PCT/US2004035141
    • 2004-10-22
    • FLESHER ROBERT W
    • FLESHER ROBERT W
    • B25B13/48B25B15/00B25B23/00F16B20060101F16B23/00F16B31/02F16B35/06F16B41/00
    • B25B13/485F16B23/0023F16B23/0046F16B23/0069F16B31/021F16B41/005
    • A fastener includes a round, blind hole or pocket in its head. Installation and removal of the fastener is accomplished with a tool containing an eccentric segment on the end of a shaft. When rotated within the pocket, the eccentric segment displaces laterally relative to the shaft to provide a friction grip to the lateral wall of the pocket. The strength of the grip is proportional to the applied torque. Eccentric displacement allows rotation but prevents the tool from spinning out of the fastener thereby eliminating cam-out and surface damage resulting from contact with a spinning tool tip. The eccentric head of the tool can be made disposable and to shear off when a predetermined torque is reached. The smooth-sided round hole offers no purchase for commonly available tools; making the fastener tamper-resistance. In another embodiment, the fastener includes a raised portion in the pocket. A tool having a complementary opening shears off the raised portion at a predetermined torque.
    • 紧固件在其头部包括圆形,盲孔或口袋。 紧固件的安装和拆卸通过在轴的端部上包含偏心段的工具来实现。 当在口袋内旋转时,偏心部分相对于轴横向移位,以向口袋的侧壁提供摩擦抓握。 把手的强度与施加的扭矩成比例。 偏心位移允许旋转,但是防止工具从紧固件中脱出,从而消除了与旋转工具尖端接触造成的凸出和表面损伤。 工具的偏心头可以制成一次性的,并且在达到预定扭矩时被剪断。 光滑圆孔不提供常用工具的购买; 使紧固件防篡改。 在另一个实施例中,紧固件包括在口袋中的凸起部分。 具有互补的开口的工具以预定的扭矩剪切掉凸起部分。