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    • 36. 发明申请
    • Threaded fastener with dual reinforcing leads having arrowhead cross-sectional configuration and improved substrate entry or lead end portion, thread rolling die for forming the threaded fastener, and method for manufacturing the threaded fastener
    • 具有双重加强引线的螺纹紧固件,具有箭头横截面构造和改进的基板入口或引线端部,用于形成螺纹紧固件的螺纹滚压模具以及用于制造螺纹紧固件的方法
    • US20050158149A1
    • 2005-07-21
    • US10845461
    • 2004-05-13
    • Cheryl PanasikKenneth LeVeyRobert Fischer
    • Cheryl PanasikKenneth LeVeyRobert Fischer
    • B21H3/02B21H3/06F16B25/00F16B33/02F16B25/10
    • B21H3/02B21H3/027B21H3/06F16B25/0031F16B25/0047F16B25/0068
    • A new and improved threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead. The threaded fastener further comprises a pointed tip portion for initiating driving insertion of the threaded fastener into an underlying workpiece, and that portion of the dual reinforcing lead, which has previously been interposed between the tip portion and the primary thread lead, or between the first and second successive threads of the first primary thread lead, has been removed. In this manner, a circumferentially extending space has effectively been created for permitting chips or debris, normally generated during the self-tapping of the threaded fastener into a bore previously pre-drilled within the underlying workpiece, to be temporarily accumulated within such circumferential space whereby such chips or debris can subsequently be automatically discharged from such space into the depths of the pre-drilled bore as the threaded insertion of the threaded fastener into the pre-drilled bore of the workpiece proceeds. This structure reduces torque insertion levels and permits enhanced depth penetration of the threaded fastener into the workpiece. The fastener also comprises lobe members formed upon the primary thread lead so as to predeterminedly affect torque insertion and pull-out resistance values.
    • 新的改进的螺纹紧固件包括第一主螺纹引线和交替插入在第一主螺纹引线的连续螺纹之间的一对第二副螺纹引线。 螺纹紧固件还包括尖端部分,用于启动螺纹紧固件的驱动插入到下面的工件中,并且先前已经插入在尖端部分和主螺纹引线之间的双重加强引线的部分或者在第一 和第一个主线程的第二个连续线程已被移除。 以这种方式,已经有效地创建了周向延伸的空间,以允许通常在将螺纹紧固件自攻入预先在下面的工件内预先钻孔的孔中产生的碎屑或碎屑暂时地积聚在该圆周空间内,由此 随着将螺纹紧固件螺纹插入工件的预先钻孔中,这种碎屑或碎屑随后可以自动地从这样的空间排出到预钻孔的深度中。 这种结构减小了扭矩插入水平,并且允许增加螺纹紧固件进入工件的深度穿透。 紧固件还包括形成在主线导程上的凸角构件,以便预定地影响扭矩插入和拉出阻力值。