Piercing sharp pointed gypsum board screw for metal studs

Details Piercing sharp pointed gypsum board screw for metal studs Piercing sharp pointed gypsum board screw for metal studs

1974-09-23

1976-03-09

Parsons, Jr., Marion

F16B 2500

Patent

active

039424057

ABSTRACT:
A screw having a shank and a tapered portion with an especially sharp point for attaching gypsum board to metal building studs having multiple threads occuring within the other in the body portion. In the tapered portion of the screw one of the threads gradually decreases in diameter and fades into the tapered portion of the shank and terminates. The other thread continues on toward the point end, decreases in diameter and fades into the tapered portion of the shank at a point nearer the pointed end of the screw.

REFERENCES:
patent: 410698 (1889-09-01), Rogers
patent: 449887 (1891-04-01), Rogers
patent: 1749903 (1930-03-01), Cannon
patent: 2314391 (1943-03-01), De Vellier
patent: 3541918 (1970-11-01), Johnson
patent: 3861269 (1975-01-01), Laverty
patent: R3941 (1870-04-01), Pierce
patent: R28111 (1974-08-01), Laverty

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