Patent ID: 7695228

Claim:
A fastener for clamping composite wood material to a base structure, comprising: a shank with a tapered section at one end and a clamping head at the other end; a first threaded section, closer to said tapered section, adapted to make a bore in said composite wood material and for engaging with said base structure; a second threaded section, closer to said clamping head, wherein said first threaded section has threads having a first pitch and said second threaded section has threads having a second pitch smaller than said first pitch, said second threaded section being adapted to forcibly drive remnants from the composite wood material into the bore of the composite wood material; a neck section connecting said second threaded section and said clamping head, said clamping head having a clamping surface for clamping said composite wood material and said base structure, wherein said second threaded section has a second thread diameter and said clamping head has a head diameter, said head diameter being greater than said second thread diameter; and a shank diameter of the first threaded section is substantially the same as a shank diameter of the second threaded section.