Screw structure

Abstract

A screw structure is disclosed herein. It comprises a head; a rod body integrally extended from the head and having a flat shank part and a tapered tip at a terminal of the flat shank part; a first screw thread disposed on the rod body and having a positioning tooth at a terminal thereof, a plurality of cutting units and a plurality of shaving collection spaces; a plurality of second screw threads disposed on the rod body; and a reamer thread disposed at an upper end of the rod body.

Claims

1. A screw structure, comprising: a head having a plurality of positioning threads at a bottom thereof; a rod body integrally extended from the head and having a flat shank part and a tapered tip at a terminal of the flat shank part; a first screw thread disposed on the rod body and having a positioning tooth at a terminal thereof, a lower part connected to the positioning tooth, an upper part connected to the lower part, a plurality of cutting units disposed on the lower part, a plurality of connecting sections, each disposed between every two adjacent cutting units, and a plurality of shaving collection spaces, each formed between every two adjacent cutting units; a plurality of second screw threads disposed on the rod body, wherein each of the plurality of second screw threads has a bevel cutting section and an arc cutting section, and wherein the bevel cutting section and the arc cutting section define an included angle; a reamer thread disposed at an upper end of the rod body; and a plurality of embossed teeth disposed between the first screw thread and the reamer thread.

2. The screw structure as claimed in claim 1, wherein the included angle between the bevel cutting section and the arc cutting section is 45 degrees.

3. The screw structure as claimed in claim 1, wherein the rod body is provided with six second screw threads thereon.

4. The screw structure as claimed in claim 1, wherein the head is provided with six positioning threads at the bottom thereof.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a first stereogram showing a screw structure according to the present invention;

(2) FIG. 2 is a second stereogram showing a screw structure according to the present invention;

(3) FIG. 3 is a bottom view showing a screw structure according to the present invention;

(4) FIG. 4 is a partial enlarged view showing a plurality of shaving collection spaces according to the present invention;

(5) FIG. 5 is a partial enlarged view showing a plurality of second screw threads according to the present invention;

(6) FIG. 6 is a schematic diagram showing a screw structure screwed into two articles.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

(8) As showed in FIG. 1 to FIG. 6, a screw structure according to the present invention is disclosed herein. It comprises a head (1) having a plurality of positioning threads (11) at a bottom thereof, a rod body (2) integrally extended from the head (1), a first screw thread (3) disposed on the rod body (2), a plurality of second screw threads (4) disposed on the rod body (2), a reamer thread (5) disposed at an upper end of the rod body (2), and a plurality of embossed teeth (6) disposed between the first screw thread (3) and the reamer thread (5). The rod body (2) is provided with a flat shank part (21) and a tapered tip (22) at a terminal of the flat shank part (21). The first screw thread (3) is provided with a positioning tooth (23) at a terminal thereof and divided into a lower part (31) connected to the positioning tooth (23) and an upper part (32) connected to the lower part (31). The first screw thread (3) is further provided with a plurality of cutting units (33) disposed on the lower part (31), a plurality of connecting sections (34), each disposed between every two adjacent cutting units (33), and a plurality of shaving collection spaces (35), each formed between every two adjacent cutting units (33). Each of the plurality of second screw threads (4) has a bevel cutting section (41) and an arc cutting section (42). The bevel cutting section (41) and the arc cutting section (42) define an included angle of 45 degrees.

(9) Referring to FIG. 1 to FIG. 6, in practical use of the present invention, the screw is locked into two wood articles, e.g. an upper article (A) and a lower article (B). The screw is first screwed into the upper article (A) by the positioning tooth (23) for securing a drilling position and avoiding shift. Then, the first screw thread (3) on the tapered tip (22) cooperated with the plurality of second screw threads (4) continue to screw into the upper article (A). Preferably, there are six second screw threads (4), each of which has the bevel cutting section (41) and the arc cutting section (42). Preferably, the included angle between the bevel cutting section (41) and the arc cutting section (42) is 45 degrees. After the tapered tip (22) is screwed into the upper article (A), the plurality of cutting units (33) on the lower part (31) of the first screw thread (3) assist and enhance the drilling action, thus achieving rapid insertion of the screw into the lower article (B). Furthermore, the cut wood shavings are gathered in the plurality of shaving collection spaces (35), so the screw can tightly fasten on the lower article (B).

(10) After the screw is screwed into the upper article (A) and the lower article (B), the plurality of embossed teeth (6) and the reamer thread (5) on the flat shank part (21) can lock the upper article (A). The plurality of embossed teeth (6) effectively retain the wood shavings to tightly fasten on the upper article (A), and the reamer thread (5) and the plurality of positioning threads (11) at the bottom of the head (1) stably lock the upper article (A). Accordingly, the reamer thread (5) and the plurality of shaving collection spaces (35) respectively lock the upper article (A) and the lower article (B), so the screw is not easily loosened due to vibration after being locked and thus achieves an excellent anti-loose effect. Additionally, the plurality of positioning threads (11) limits a screwing depth of the head (1) so that the head (1) is not sunken on a surface of the upper article (A), which keeps the surface of the upper article (A) flat and avoids the accumulation of dust in the depression on the surface.

(11) According to the above description, in comparison with the traditional technique, the screw structure according to the present invention has the advantages as following:

(12) 1. The positioning tooth protruded from an outer of the first screw thread secures the drilling position and avoids shift, so the present invention has the effect of maintaining a stable position.

(13) 2. The bevel cutting section and the arc cutting section of the second screw threads and the cutting units on the lower part of the first screw thread assist and enhance the cutting action, thus achieving rapid insertion of the screw into the wood articles.

(14) 3. The shaving collection spaces gather and store the cut wood shavings when the screw in rapidly screwed into the lower article to tighten the lower article, so the present invention is not easily loosened due to vibration after being locked and thus achieves an excellent anti-loose effect.

(15) 4. The reamer thread and the shaving collection spaces respectively lock the upper article and the lower article, so the present invention is not easily loosened due to vibration after being locked and thus achieves an excellent anti-loose effect.

(16) 5. The positioning threads limit the locking depth of the head so that the head is not sunken on a surface of the upper article, which keeps the surface of the upper article flat and avoids the accumulation of dust in the depression on the surface.

(17) 6. The embossed teeth on the flat shank part allows the screw to rapidly drill into the upper article and retains the wood shavings to tightly fasten on the upper article, which increase the adhesion between the screw and the upper article and prevent loosening by vibration.