发明名称 |
SCREW FOR MAKING SMOOTH OR THREADED OPENINGS |
摘要 |
Hole forming and selftapping screw of up to approximately 6 mm thread diameter for tapping into sheet metal of a thickness of up to approximately 1 mm comprising a head including a formation for receiving a tool, a thread shank and a cylinder member following thereon having a diameter less than the thread-pitch diameter of the thread shank, merging into a tapered hole forming member. The thread shank merges with the cylinder member via a taper extending over approximately four threads, a distance corresponding approximately to the four-fold sheet metal thickness. The hole forming member terminates in a convexly curved friction surface corresponding to a radius (R) of approximately 0.5 mm. The entire screw is formed in one piece of tempered steel having a tensile strength of up to approximately 1400 N/mm2, mechanically hardened steel respectively. |
申请公布号 |
RU2042056(C1) |
申请公布日期 |
1995.08.20 |
申请号 |
SU19915001811 |
申请日期 |
1991.09.20 |
申请人 |
EJOT EBERKHARD EGER GMBKH UND KO., KG |
发明人 |
KHERMANN GROSSBERNDT;GYUNTER KRECHMER;KHORST KLEES;ALI GYUVEN |
分类号 |
F16B25/10;(IPC1-7):F16B25/10 |
主分类号 |
F16B25/10 |
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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