Wood screw with cutting teeth on threads and groove in shank

• US 20070286701A1
• Filed: 06/07/2006
• Published: 12/13/2007
• Est. Priority Date: 06/07/2006
• Status: Abandoned Application

• Current Assignee: Kuo-Tai Hsu
• Original Assignee: Kuo-Tai Hsu
• Inventors: Hsu, Kuo-Tai
• Application Number:
  US11/448,086
• Publication Number:
  US 20070286701A1
• Time in Patent Office: Days
• US Class Current: 411/387.100
• CPC Class Codes: F16B 25/0015 the material being a soft organic material, e.g. wood or plastic F16B25/0031 takes precedence
• CPC Class Codes: F16B 25/0052 the ridge having indentations, notches or the like in order to improve the cutting behaviour
• CPC Class Codes: F16B 25/0068 with multiple-threads, e.g. a double thread screws
• CPC Class Codes: F16B 25/0073 characterised by its pitch, e.g. a varying pitch
• CPC Class Codes: F16B 25/10 Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws

Abstract

A wood screw includes a head and a shank which includes a screw-in portion including a tapered section and a tip point at a distal end of the tapered section. A groove is defined longitudinally in the shank and starts from the tapered section and extends toward the head. A plurality of threads are formed on an outer periphery of the shank including the screw-in portion. A plurality of cutting teeth are formed on the threads on the screw-in portion. A plurality of ribs extend spirally from an outer periphery of the shank and located between the threads.

Claims

1. A wood screw comprising:

a head and a shank connected to the head, the shank including a screw-in portion which includes a tapered section and a tip point at a distal end of the tapered section, a groove defined longitudinally in the shank and two cutting edges being formed on two sides of the groove, a plurality of threads formed on an outer periphery of the shank including the screw-in portion, a plurality of cutting teeth formed on the threads on the screw-in portion, a plurality of ribs extending from an outer periphery of the shank and located between the threads.

2. The wood screw as claimed in claim 1, wherein the ribs extend spirally from the outer periphery of the shank.

3. The wood screw as claimed in claim 1, wherein each cutting tooth has a crest portion which is wider than a crest portion of the threads.

4. The wood screw as claimed in claim 1, the groove starts from a far-most cutting teeth from the tip point and extends toward the head.

5. The wood screw as claimed in claim 1, the ribs start from a first end of the shank and the first end of the shank is connected with the head, the ribs terminate before the screw-in portion.