Male screw-forming members

Details Male screw-forming members Male screw-forming members

1974-11-21

1976-02-24

Lanham, C. W.

10 27R, 85 46, B21H 302, B23G 900, B21K 144

Patent

active

039395120

ABSTRACT:
The specification discloses a method of making a male, screw-forming member, i.e., a member which forms a screw thread in a plain hole without cutting. The shank of the member is threaded and has three portions, a first portion of constant, circular cross section, a generally conical second portion of lobular cross section at the free end of the shank and a third portion of lobular cross section interposed between the first and second portions. The arrangement of the portions is such that the third portion forms a thread, in a plain hole of appropriate diameter, of greater effective diameter than the effective diameter of the thread on said first portion. The member is made by first threading the shank and then deforming the second and third portions to lobular cross-section.

REFERENCES:
patent: 3246556 (1966-04-01), Phipard
patent: 3342234 (1967-09-01), Evans
patent: 3398625 (1968-08-01), Ansingh
patent: 3426642 (1969-02-01), Phipard

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