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US 4,697,969 AGranted
Wood screw
OwnerWilford S. Sparkesinventor
Life of this patent
Estimating the term…
Abstract
An improved wood screw which is self drilling. The wood screw has a first spiral flute that extends essentially the full length of the screw. The screw also has a second spiral flute which begins at the point of the screw and which terminates a short distance from the point.
Claims10
An improved wood screw of the type having a head, a shank, a root, a point and threads spiralled about the root, said screw having exceptionally easy starting and insertion of the screw in wood wherein the improvement comprises:
- a first spiral flute beginning at the point of the screw and passing essentially the full length of the screw;
- and
- a second spiral flute beginning at the point of the screw and terminating a short distance from the tip and having about the same shape at the point as the first spiral flute so that the tip is symmetrical about a bisector whereby the tip of the flute acts as a drill point retaining partial threads, and the first spiral flute carries wood dust out of the hole which is drilled by the turning of the screw.
Dependencies are inferred from the claim text.