SCREW STRUCTURE

Abstract

The present invention relates to a screw structure, including a head part, a rod part, a first thread and a second thread. The head part is arranged at one end of the rod part. The other end of the rod part is opposite to the head part to form a tapered tap-lock screw-in end. The first thread is arranged on the surface of the rod part with a clockwise spiral ring and extends to the tap-lock screw-in end. The second thread is arranged on the surface of the tap-lock screw-in end with a counterclockwise spiral ring. The crest height of the second thread is lower than 50% of the crest height of the first thread, and several teeth are formed on the second thread. Accordingly, through the setting of the second thread, the screw has multiple functions such as crushing and chip removal.

Claims

1. A screw structure, comprising: a head part, a rod part, a first thread, and a second thread; wherein the head part is arranged at one end of the rod part, wherein the rod part forms a tapered tap-lock screw-in end at the other end opposite to the head part, wherein in the position of the rod part adjacent to the head part, the first thread is arranged on the surface of the rod part in a clockwise spiral ring and extends to the tap-lock screw-in end, wherein the second thread is arranged on the surface of the tap-lock screw-in end with a counterclockwise spiral ring, and the second thread includes several teeth arranged thereon.

2. The screw structure as claimed in claim 1, wherein the crest height of the second thread is less than 50% of the crest height of the first thread, but close to half the crest height of the first thread.

3. The screw structure as claimed in claim 2, wherein the teeth are arranged at equal intervals.

4. The screw structure as claimed in claim 3, wherein the teeth are in the shape of a quadrangular pyramid.

5. The screw structure as claimed in claim 1, wherein the teeth are arranged at equal intervals.

6. The screw structure as claimed in claim 5, wherein the teeth are in the shape of a quadrangular pyramid.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 illustrates the perspective view of the screw structure of the present invention.

[0015] FIG. 2 illustrates the enlarged perspective view of the tap-lock screw-in end of the screw of the present invention.

[0016] FIG. 3 illustrates the perspective view when the screw of the present invention is screwed into the workpiece.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0017] In order to have a more complete and clear disclosure of the technical content used in the present invention, the purpose of the invention and the effect achieved, the present invention is described in detail below, referring to the disclosed drawings and drawing numbers:

[0018] Referring to FIGS. 1 and 2, FIG. 1 is a perspective view illustrating the screw structure of the present invention, and FIG. 2 is an enlarged perspective view illustrating the tap-lock screw-in end of the screw of the present invention.

[0019] The screw 100 of the present invention includes a head part 1, a rod part 2, a first thread 3 and a second thread 4, wherein:

[0020] the rod part 2 has two ends opposite to each other, the head part 1 is arranged at one end of the rod part 2, and a tapered tap-lock screw-in end 21 is formed at the other end of the rod part 2, wherein the first thread 3 is arranged on the surface of the rod part 2 in a clockwise spiral ring, and the first thread 3 extends from the position of the rod part 2 adjacent to the head part 1 to the tap-lock screw-in end 21, wherein the second thread 4 is arranged on the surface of the tap-lock screw-in end 21 in a counterclockwise spiral ring, and the second thread 4 includes several teeth 41 arranged thereon.

[0021] Thus, when the screw 100 wants to be screwed into the workpiece 200 (referring to FIGS. 2 and 3), the second thread 4 with a counterclockwise spiral ring is arranged at the tap-lock screw-in end 21 of the rod part 2, producing an excellent chip removal effect. At the same time, the teeth 41 formed on the second thread 4 are further used to produce the function of crushing the workpiece 200 when the screw 100 is screwed into the workpiece 200, so that the screw 100 can be drilled into the workpiece 200 more easily.

[0022] According to a preferred embodiment, the crest height of the second thread 4 of the screw 100 of the present invention is less than 50% of the crest height of the first thread 3, but close to half the crest height of the first thread 3. That is, the pitch of the second thread 4 is no more than half of the pitch of the first thread 3.

[0023] According to a preferred embodiment, the crest height of the second thread 4 is less than or equal to the crest height of the first thread 3.

[0024] According to a preferred embodiment, the teeth 41 of the screw 100 of the present invention on the second thread 4 are arranged at equal distances from each other. Moreover, preferably, the teeth 41 are in the shape of a quadrangular pyramid.