发明名称 |
IMPROVED SELF-TAPPING THREAD FASTENER AND A BLANK THEREFOR |
摘要 |
A blank for a self tapping fastener, and corresponding fastener is provided. The blank defines an odd number of lobes along a cross section taken perpendicular to its axis of rotation. The lobes define a relatively high out-of-round cross section along a tapered thread-forming zone, and a relatively low out-of-round cross section along the main body taken in a direction toward the drive head. Between the main body and tapered thread-forming zone is located an additional thread forming zone having an axial length of approximately one thread pitch and a cross section that conforms to the high out-of-round of the tapered zone. The maximum diameter (at the lobes) of the additional thread-forming section approximately matches that of the full-diameter main body section. A lower-diameter stabilizing section can be provided ahead of the tapered zone, adjacent the tip of the fastener. |
申请公布号 |
EP1066473(B1) |
申请公布日期 |
2004.06.16 |
申请号 |
EP19990959634 |
申请日期 |
1999.12.28 |
申请人 |
CONTI FASTENERS AG |
发明人 |
REYNOLDS, JOHN, R.;PRITCHARD, ALAN |
分类号 |
B21K1/46;B21K1/56;F16B25/00;(IPC1-7):F16B25/00 |
主分类号 |
B21K1/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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