发明名称 |
SCREW |
摘要 |
A screw usable as either a wood screw or a self-tapping screw comprises a two start helical thread (12) having a helix angle of 20<o> or more with an included angle to the thread profile at its crest of 40<o> or less. The threads are raised rapidly from a conical un-threaded entry point (14) and the thread crest diameter is greater than that of the unthreaded shank portion (10) of the screw. |
申请公布号 |
GB2131907(B) |
申请公布日期 |
1986.10.29 |
申请号 |
GB19830031727 |
申请日期 |
1983.11.28 |
申请人 |
* GKN SCREWS & FASTENERS LIMITED |
发明人 |
JAMES LAWRENCE * SEYMOUR;GEORGE EDWARD * HARDWICK |
分类号 |
F16B25/00;(IPC1-7):F16B25/00 |
主分类号 |
F16B25/00 |
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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