Thread rolling screw

Details Thread rolling screw Thread rolling screw

1991-01-24

1992-02-18

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411418, F16B 2500

Patent

active

050888692

ABSTRACT:
A thread rolling screw has a continuous helical set of threads formed on a body. The threads have a tip section, an intermediate section, and a final section. In the tip and intermediate sections, the diameters of the crests progressively increase. In the intermediate section, relieved areas are spaced apart around the crests of the threads. In the final section, the threads are continuous and circular and of constant diameter. The crest of the last intermediate thread is the same diameter as the crests of the final thread section.

REFERENCES:
patent: 429851 (1990-06-01), Ericson
patent: 2093171 (1937-09-01), Olson
patent: 2096937 (1937-10-01), McManus
patent: 2292195 (1942-08-01), Brown
patent: 2624228 (1953-01-01), Brown
patent: 3339952 (1967-09-01), Beckman
patent: 3370501 (1968-02-01), Ansingh
patent: 3446262 (1969-05-01), Phipard
patent: 4040328 (1977-08-01), Muenchinger
patent: 4315340 (1982-02-01), Veldman
patent: 4486135 (1984-12-01), Kazino
patent: 4973209 (1990-11-01), Essom et al.
TR-3 PSN Thread Rolling Screw, High Performance Thread Rolling Screw with Measurable Differences.
Square-Flo will meet it!, National Lock Fasterners, Division of Keystone Consolidated Industries, Inc. Rockford Ill. 61101.

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