发明名称 |
SCHROEF MET EEN KRUISVORMIGE UITSPARING IN DE KOP, ALSMEDE SCHROEVEDRAAIER VOOR TOEPASSING BIJ ZO'N SCHROEF EN PONS VOOR HET VORMEN VAN DE UITSPARING. |
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 |
NL181818(C) |
申请公布日期 |
1987.11.02 |
申请号 |
NL19760007866 |
申请日期 |
1976.07.15 |
申请人 |
G.K.N. SCREWS & FASTENERS LIMITED TE SMETHWICK, GROOT-BRITTANNIE. |
发明人 |
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分类号 |
B25B23/10;B21J13/02;B21K1/46;B25B15/00;F16B23/00;(IPC1-7):F16B23/00 |
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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