Screw having cutting teeth formed on threads thereof

Details Screw having cutting teeth formed on threads thereof Screw having cutting teeth formed on threads thereof

1999-04-23

2000-05-02

Wilson, Neill

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

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

Thread or shank structure

411311, 4113874, F16B 3504, F16B 3930

Patent

active

060564911

ABSTRACT:
A screw includes a straight portion and a cutting screw-in portion tapered toward a pointed end. A cutting thread is provided on the tapered screw-in portion. The cutting thread has several cutting teeth spaced apart thereon, and connects threads of the straight portion. Each of the cutting teeth has a sawtooth like shape and is sloping at an angle. The cutting teeth can cut the wood into relatively small bits on the contact with it when the screw is being screwed into the wood, and drive part of the bits out of the hole of the wood to prevent the wood from being cracked. The cutting teeth can help the screw to be screwed into the wood with relatively great speed and small resistance.

REFERENCES:
patent: 924273 (1909-06-01), Rehse
patent: 2200227 (1940-05-01), Olson
patent: 3083609 (1963-04-01), Lovisek
patent: 5044853 (1991-09-01), Dicke
patent: 5895187 (1999-04-01), Hsu

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