Screw for fibrous boards

Details Screw for fibrous boards Screw for fibrous boards

1996-05-16

1997-09-16

Wilson, Neill R.

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

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

Thread or shank structure

411418, F16B 2500, F16B 3504

Patent

active

056673485

ABSTRACT:
The shank portion of a screw, which is free of a drill bit portion and which is adapted for use with a fibrous board, has a surface that is formed with a screw thread throughout the length of the shank portion, and a lower section that is formed with a flute at the surface thereof. The flute extends from a tip of the shank portion and has a longitudinal length which is inclined with respect to a longitudinal axis of the shank portion.

REFERENCES:
patent: 324487 (1885-08-01), Rice
patent: 1235626 (1917-08-01), Woodward
patent: 1288893 (1918-12-01), Holmes
patent: 3192819 (1965-07-01), Hanneman
patent: 3507183 (1970-04-01), Thurston
patent: 3739682 (1973-06-01), Siebol et al.
patent: 5120172 (1992-06-01), Wakai
patent: 5171186 (1992-12-01), Lukes

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