Winged drill screw
    2.
    发明公开
    Winged drill screw 失效
    佛鲁吉尔-Bohrschraube。

    公开(公告)号:EP0407093A1

    公开(公告)日:1991-01-09

    申请号:EP90307061.3

    申请日:1990-06-28

    申请人: EMHART INC.

    IPC分类号: F16B25/00 F16B25/10

    摘要: A self-drilling and thread forming fastener for fastening a first softer workpiece, such as wood, to a second harder workpiece, such as metal, is described The fastener features wings (87, 88) of improved configuration including positive angle of attack, positive cutting edge relief angles, teardrop-like crescent shape cross section and knife-like cutting edge which exhibit faster drill times through wood.

    摘要翻译: 描述了用于将第一较软的工件(例如木材)紧固到第二较硬工件(例如金属)上的自钻和成形紧固件。紧固件具有改进构型的翼(87,88),其包括正迎角,正 切割刃角度,泪珠状月牙形截面和刀形切割刃,通过木材显示更快的钻孔时间。