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1. 发明授权

US5599149A Self-tapping floor screw 失效
标题翻译：自攻地板螺丝
公开(公告)号：US5599149A
公开(公告)日：1997-02-04
申请号：US395788
申请日：1995-02-28
申请人： Vince Clemente
发明人： Vince Clemente
IPC分类号： F16B25/00 , F16B35/04
CPC分类号： F16B25/0031 , F16B25/0078
摘要： A self-tapping screw fastener includes a shank having first and second ends and a head disposed at the second end of the shank. The shank has a tapered portion of a predetermined axial length adjacent the first end, and the tapered portion terminates at the first end in a substantially circular end surface having a first diameter. The shank also has a substantially cylindrical portion having a second diameter extending from the second end to the tapered portion. A thread extends helically along a circumferential outer surface of the shank from a location near the head substantially to the first end such that the thread at least partially covers the cylindrical and tapered portions of the shank. The ratio of the axial length of the tapered portion to the diameter of the end surface exceeds substantially 1.5, and the diameter of the end surface is less than but substantially equal to the diameter of the cylindrical portion of the shank.
摘要翻译：自攻螺钉紧固件包括具有第一和第二端部的柄部和设置在柄部的第二端部的头部。柄部具有与第一端相邻的预定轴向长度的锥形部分，并且锥形部分在第一端处终止于具有第一直径的基本圆形的端面中。柄部还具有大致圆柱形的部分，其具有从第二端延伸到锥形部分的第二直径。螺纹沿着颈部的周向外表面螺旋地从头部附近的位置大致延伸到第一端，使得螺纹至少部分地覆盖柄的圆柱形和锥形部分。锥形部分的轴向长度与端面的直径的比率大体上超过1.5，并且端面的直径小于但基本上等于柄的圆柱形部分的直径。

2. 发明授权

US3903784A Self-countersinking fastener head 失效
标题翻译：自反对紧固件头
公开(公告)号：US3903784A
公开(公告)日：1975-09-09
申请号：US21507172
申请日：1972-01-03
申请人： ANCHOR BOLT AND SCREW COMPANY
发明人： DEKKER CHARLES
IPC分类号： F16B35/06 , F16B25/00
CPC分类号： F16B35/065
摘要： Hot or cold forging is used to manufacture self-countersinking threaded fastener heads, such as self-countersinking screw heads and the like, which, during manufacture, can be removed from the heading die by straight axial movement. One aspect of the present invention involves the use of a relatively narrow included angle for the tapered underside of the head in combination with an axially extending sharp edge collar cutter originating at the periphery of the head. Another aspect of the present invention involves providing elongated cutters and cutter reliefs along the tapered underside of the head. The cutter reliefs form cutter recesses with the cutting edges at the top thereof. The recesses are shaped so that respective imaginary lines extending axially downwardly from any point on the surface of the recess encounter no other portion of the fastener. Moreover, in this aspect of the invention the cutting edges slope in the opposite direction of the slope of the screw threads on the fastener.

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