Screw for use as a fastener in fibrous material such as wood

Details Screw for use as a fastener in fibrous material such as wood Screw for use as a fastener in fibrous material such as wood

1999-03-16

2000-11-28

Browne, Lynne H.

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

Having structure to restrict rotation of threaded, mating...

Comprising a thread lock

411417, 4113873, F16B 3930

Patent

active

061526665

ABSTRACT:
The thread (15) of a wood or the like screw has pairs of V-shaped recesses (22, 23) in the edge of a selected intermediate length of the thread (17). Each pair defines a W-shaped cutout (19, 20, 11). The cutouts (19-21) extend into only a part of radial width of the thread (15). There are only about five cutouts (19-21) at each convolute (17) of the limited length. The lengths of the thread portion (16) at the tip and the thread portion (18) at the head (13) of the screw are devoid of the cutouts. Each cutout defines a cutting tooth (24) which facilitates the driving of the screw into the workpiece. The recesses (22, 23) provide cavities for fibrous debris generated by the respective tooth (24). When the screw is in place, the teeth (24) are pressed axially toward the thread produced in the workpiece to reduce the loosening tendency of the installed screw. The disposition and size of the cutouts (19-21), is about three cutouts per one convolute so as not to unduly impede the torque strength of the screw.

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