Driving screws and method of fabricating the same |
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| 申请号 | US1131260 | 申请日 | 1960-02-26 | 公开(公告)号 | US3071022A | 公开(公告)日 | 1963-01-01 |
| 申请人 | BRUNO STRANDGREN CARL; | 发明人 | BRUNO STRANDGREN CARL; | ||||
| 摘要 | |||||||
| 权利要求 | 1. A METHOD OF FABRICATING A DRIVING SCREW, COMPRISING THE STEPS OF FORMING AT LEAST ONE HELICAL GROOVE IN A CYLINDRICAL BODY, TREATING A WIRE TO DEVELOP RESIDUAL COMPRESSION STRESSES IN PART OF THE CROSS-SETION THEREOF, AND SECURING SUCH WIRE IN SAID BODY GROOVE WITH SUCH PART OF THE WIRE CROSS SECTION OUTERMOST. 2. THE METHOD, AS SET FORTH IN CLAIM 1, INCLUDING THE STEPS OF ROLLING THE WIRE TO CAUSE DIFFERENTIAL ELONGATION |
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| 说明书全文 | |||||||
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