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公开(公告)号：US4089357A
公开(公告)日：1978-05-16
申请号：US706035
申请日：1976-07-16
申请人： Peter John Gill
发明人： Peter John Gill
CPC分类号： F16B23/0023 , Y10S411/919
摘要： A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90.degree. angular spacings, the bases of the grooves lying on a conical (or pyramidal) surface and wherein the included angle at the vertex of such cone (or pyramid) has a value within the range of 40.degree. - 45.degree., the preferred value being 40.degree..
摘要翻译： 具有头部和螺纹柄部的螺钉，并且在头部中具有十字形凹槽，该十字形凹槽包括中心腔和从中心空腔以90°角度间隔辐射的四个凹槽，凹槽的底部位于圆锥形（或金字塔形） 表面，其中在这种锥体（或金字塔）的顶点处的夹角具有在40°至45°范围内的值，优选值为40°。
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公开(公告)号：US4016795A
公开(公告)日：1977-04-12
申请号：US623612
申请日：1975-10-20
申请人： Peter John Gill
发明人： Peter John Gill
CPC分类号： F16B25/103 , B21K1/56 , B23P15/32 , B23P15/52 , F16B15/00 , F16B25/0084 , Y10T408/9093
摘要： A self-drilling and self-tapping fastener, particularly suitable for use in relatively thick metal, which is made from a headed blank by a method including pressing into the cylindrical free end of the blank a pair of straight flutes, by dies which are closed together on a line which is acutely angled to both the leading and trailing walls of the flutes. The flutes are inclined in opposite directions relative to the screw axis and are positioned on opposite sides of the screw. The tip is machined off to a V-form, to provide a ridge angularly advanced about the axis of the screw relative to the cutting edges of the flutes. Further machining may remove metal from the sides of the drill point between the flutes to provide flats and the drill point may be turned to a circular cross-section to provide sharp well-supported cutting edges for improved wear resistance. The drill point may taper overall, being of smallest diameter adjacent the threaded fastener shank.
摘要翻译： 一种自钻自攻紧固件，特别适用于相对较厚的金属，其由头部坯料制成，该方法包括通过封闭的模具将一对直的凹槽压入坯料的圆柱形自由端 一起在与凹槽的前壁和后壁成锐角的直线上。 凹槽相对于螺杆轴线在相反方向倾斜并且位于螺钉的相对侧上。 尖端被加工成V形，以提供相对于凹槽的切割边缘围绕螺钉的轴线成角度地前进的脊。 进一步加工可以从凹槽之间的钻头的侧面移除金属以提供平面，并且钻点可以转到圆形横截面，以提供锋利的良好支撑的切削刃，以改善耐磨性。 钻尖可以整体变细，与螺纹紧固件柄相邻的最小直径。
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