Thread-forming screw

Details Thread-forming screw Thread-forming screw

1976-06-03

1978-01-24

Britts, Ramon S.

F16B 2500

Patent

active

040697304

ABSTRACT:
An improved thread-forming screw has a circular threaded main body portion and a tapered lobular pilot or thread-forming section comprising a plurality of transverse elongated projections or lobes on a circular conical core, each lobe having a sharp ridge running the full length thereof. The sharp edges on the lobes minimize the torque required to form threads in a workpiece, while the circular main body portion maximizes the holding power of the screw in the workpiece.

REFERENCES:
patent: RE6571 (1975-08-01), Young
patent: 328139 (1885-10-01), Patten
patent: 3083609 (1963-04-01), Lovisek
patent: 3209383 (1965-10-01), Carlson
patent: 3370501 (1968-02-01), Ansingh

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