发明名称 |
SKRUV, SOM HAR ETT URTAG FOR INGREPP MED EN MEJSEL, MEJSEL SAMT STANS FOR FORMNING AV URTAG I SKALLEN HOS SKRUVEN |
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 DEG 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 DEG - 45 DEG , the preferred value being 40 DEG . |
申请公布号 |
SE428050(B) |
申请公布日期 |
1983.05.30 |
申请号 |
SE19760008044 |
申请日期 |
1976.07.14 |
申请人 |
GKN SCREWS Ÿ& FASTENERS LTD |
发明人 |
P J * GILL |
分类号 |
B25B23/10;B21J13/02;B21K1/46;B25B15/00;F16B23/00;(IPC1-7):16B23/00 |
主分类号 |
B25B23/10 |
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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