FLOORING SCREW

• US 20170227039A1
• Filed: 02/05/2016
• Published: 08/10/2017
• Est. Priority Date: 02/05/2016
• Status: Active Grant

• Current Assignee: Bi-Mirth Corp.
• Original Assignee: Bi-Mirth Corp.
• Inventors: SHIH, YI-CHIEH
• Granted Patent: US 9,970,470 B2
• Time in Patent Office: Days
• 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 25/0047 the ridge being characterised by its cross-section in the plane of the shaft axis
• CPC Class Codes: F16B 25/0063 with a non-threaded portion on the shaft of the screw
• CPC Class Codes: F16B 25/0078 with a shaft of non-circular cross-section or other special geometric features of the shaft
• CPC Class Codes: F16B 25/0084 characterised by geometric details of the tip
• CPC Class Codes: F16B 25/103 by means of a drilling screw-point, i.e. with a cutting and material removing action

Abstract

A flooring screw comprises a screw head, a screw shank connected with the screw head, and a cone connected with screw shank. The screw shank includes a first shank section connected with the screw head, a second shank section connected with the cone, a first thread formed on the first shank section, a second thread extended from the cone to the second shank section and running helically along a direction opposite the direction of the first thread, and a third shank section between the first shank section and the second shank section. The third shank section includes a plurality of peaks protruding outward radially and a plurality of troughs formed between the peaks and recessed radially with respect to the peaks. The peaks and the troughs form an unsmooth surface on the third shank section.

Claims

1. A flooring screw comprising a screw head, a screw shank connected with the screw head, and a cone connected with the screw shank, wherein the screw shank includes a first shank section connected with the screw head, a second shank section connected with the cone, a first thread formed on the first shank section, a second thread extended from the cone to the second shank section and running helically along a direction opposite the direction of the first thread, and a third shank section between the first shank section and the second shank section, and wherein the flooring screw is characterized in

that the third shank section includes a plurality of peaks protruding outward radially and a plurality of troughs formed between the peaks and recessed radially with respect to the peaks, and

that the peaks and the troughs form an unsmooth surface on the third shank section.

2. The flooring screw according to claim 1, wherein each peak is in form of a pyramid, and each trough is a groove among the peaks, and wherein a distance between two neighboring peaks is smaller than a pitch of the first thread or the second thread.

3. The flooring screw according to claim 2, wherein the peaks are arranged into rows surrounding the third shank section, and wherein two neighboring rows of peaks are arranged in a staggered way.

4. The flooring screw according to claim 1, wherein the third shank section is a polygonal-shape rod, and wherein each peak is a corner of a polygonal, and each trough is a side of the polygonal.

5. The flooring screw according to claim 1, wherein the level of the peak is between the level of the second shank section and the level of the second thread.

6. The flooring screw according to claim 1, wherein the diameter of the third shank section is slightly greater than the diameter of the first shank section.

7. The flooring screw according to claim 1 further comprising a debris exhaust groove recessed from the surface of the screw shank, and wherein the debris exhaust groove includes a start tip at the cone and a termination tip at the second shank section.

8. The flooring screw according to claim 1, wherein an flank angle between the screw shank and each of the first thread and the second thread is within 45-55 degrees, and the flank angles are asymmetric at the region neighboring the screw head and the region neighboring the cone.

9. The flooring screw according to claim 1, wherein tapered sections are respectively formed on the interface between the third shank section and the first shank section and on the interface between the third shank section and the second shank section, and the width of the tapered sections gradually shrink toward the third shank section.