Screw head

Details Screw head Screw head

1998-07-17

2000-08-15

Wilson, Neill

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

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

Elongated head, e.g., hanger bolt, etc.

411402, 4113873, 411919, F16B 2300, F16B 3506

Patent

active

061026425

ABSTRACT:
A drilling tapping screw includes a head engageable with rotary fastening tool, and a shank extending downward from the head and having a lower end having with a drilling tip, including a tapping and fastening thread defined from the end face thereof to the head. The head includes a pointed projection, an engaging portion engageable with the rotary fastening tool, and a collar. The pointed projection consists of a first tapered portion with a conical top end, a shaft with a fixed outer diameter, and a second tapered portion formed in the wake of the latter. Frame members made of steel are first firmly fastened by the screw, and joined to a wallboard, so that all the head portions except the collar stab the wallboard by striking with a hammer the site where the head is positioned. This temporarily locks the wallboard and prevent any warping of the site where the head is positioned in the wallboard.

REFERENCES:
patent: 662134 (1900-11-01), Rodd
patent: 2451747 (1948-10-01), Kindt
patent: 3236141 (1966-02-01), Smith
patent: 4085650 (1978-04-01), Flynn
patent: 5433569 (1995-07-01), Fall et al.
patent: 5716112 (1998-02-01), Staszak

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