Self-threading bolt

Details Self-threading bolt Self-threading bolt

1981-12-01

1984-05-22

Holko, Thomas J.

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

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

Thread or shank structure

411422, F16B 2500

Patent

active

044498748

ABSTRACT:
A threaded fastener capable of recutting damaged screw threads during installation in a threaded opening has an axial opening in its leading end intersecting a transverse opening whose ends extend through the screw threads of the fastener. The fastener is provided in its periphery at least in one location thereon with a longtiudinal recess of greater depth than the screw threads which intersects the transverse opening at right angles thereto and extends longitudinally of the fastener away from one side of the transverse opening which is remote from the axial opening. A thread cutting surface is produced by the recess and thread cuttings pass therefrom into the transverse and axial openings during installation of the fastener.

REFERENCES:
patent: 1000280 (1911-08-01), Messenger
patent: 2156350 (1937-04-01), Olson
patent: 2387720 (1944-06-01), Davis
patent: 2631812 (1948-05-01), Mueller
patent: 2795221 (1953-03-01), Braendel
patent: 2823574 (1958-02-01), Rosan
patent: 3260150 (1966-07-01), Colman
"Tap-Lok Self-Tapping Inserts", Groov-Pin Corp., Ridgefield, N.J., Pub. 10/6/59.

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