JP3078986U - Screw structure - Google Patents

Abstract

(57) [Summary] [Problem] To provide a screw structure that allows easy tapping. SOLUTION: In a screw structure having a screw main body and a spiral circular screw thread provided at an upper end of the screw main body, a spiral triangular screw thread is provided at a lower end portion of the screw main body. The three sides of the crest have an edge shape, and the pointed portion of each triangular screw thread and the screw body present a slanted screw back, and the connecting surface between the screw back and the screw body is circular. A screw structure characterized by an arc-shaped ridge and being capable of being tapped on wood.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a kind of screw structure, and more particularly, to a screw structure that has a triangular screw function for erecting and expanding timber on wood, thereby facilitating the operation of tapping.

[0002]

[Prior art]

 For general wood screws, a screw-shaped circular screw is cut into the screw body, and the screw is gradually screwed into the wood when screwing, and fixed. However, hard wood can be difficult to screw. For this reason, one company has developed a screw as shown in FIG. 1, which is provided with a general circular spiral thread 110 at the upper end of the screw body 100 and a serrated spiral at the lower end. When the screw body 120 is provided and the screw body 100 is screwed into the wood, the serrated spiral screw thread 120 cuts the wood so that the entire screw body 100 can be screwed. Although this improves the shortcomings of the earlier screws, the distribution of the pointed portions of these threads 120 is too wide and the relative frictional force during screwing has increased.

[0003] GB 2040769A shown in FIG. 2 discloses a screw 1 having a triangular thread 11. Such a screw 1 forms a screw thread 11 after the screw body 10 is directly processed into a triangular shape. British Patent No. 5,044,855, shown in FIG. 3, describes a screw 2 with a tapered bottom end, and either of the screws shown in FIG. 2 or FIG. Sharp, easy to screw into wood, but not very useful in terms of labor saving.

[0004]

[Problems to be solved by the invention]

 The main purpose of the present invention is to provide a kind of screw structure, in which a circular spiral thread and a triangular spiral thread are provided at the upper and lower ends of the screw body, respectively. The apexes of the triangular thread exhibit different angles of arrangement, and when the screw is screwed into hard wood, the screwing on the wood at the upper end of the triangular thread reduces the frictional force at the time of screwing and achieves a power saving effect. It shall be a structure.

Another object of the present invention is to provide a kind of screw structure, in which a slanted screw back is provided between the pointed portion of the triangular spiral screw and the screw body. In addition, the connecting surface between the screw back and the screw body presents an arc-shaped ridge, and when the screw is screwed in, the screw back expands the wood and passes through a relatively thin screw surface. It shall be a screw structure that can achieve labor saving of operation.

[0006]

[Means for Solving the Problems]

 The invention according to claim 1 is a screw structure comprising a screw body and a spiral circular screw thread provided at an upper end of the screw body, wherein a spiral triangular screw thread is provided at a lower end portion of the screw body. The three sides of these threads have an edge-like shape, and the pointed portion of each triangular thread and the body of the screw have a slanted back of the thread, and the connection between the back of these threads and the body of the screw. The screw structure is characterized in that the surface has an arc-shaped protuberance and can be tapped on wood. The invention according to claim 2 is the screw structure according to claim 1, wherein the screw thread at the lower end of the screw main body has a polygonal shape, and the screw threads have an arrangement of the same angle or different angles. The invention according to claim 3 is the screw structure according to claim 1, wherein the triangular or polygonal thread at the lower end of the screw body is formed by directly twisting a circular material. .

[0007]

[Embodiment of the invention]

 Please refer to FIG. The present invention includes a screw body 3, a spiral circular thread 31 is provided at an upper end of the screw body 3, a spiral triangular thread 32 is provided at a lower end, and each of the triangular threads 32 is formed. The pointed portions 321 are arranged at different angles, and between the pointed portion 321 of the triangular screw thread 32 and the screw body 3, a slanted thread back 33 is provided to connect the screw body 3. And an arc-shaped raised portion 331, which is applicable to wood of different materials.

As shown in FIG. 6, according to the present invention, the triangular screw threads 32 shown in FIG. 4 are arranged at different angles, and the upper and lower arrangements are spiral, so that the timber can be tapped. Can be Of course, for any type of screw, as shown in FIG. 7, the present invention directly processes the circular material 4 to form a triangular screw thread 32 and also forms a central circular screw body 3 portion. By doing so, the machining process can be simplified, and the pointed portion 321 of the screw thread 32 can be made sharper.

As shown in FIGS. 8 and 9, when the present invention is used for tapping actual wood, each triangular screw thread 32 is relatively thick due to the design of the screw back 33, which is After cutting, the wood 5 forms an opening 51, such as the back 33 of the thread, and passes through the opening 51 without any resistance to the relatively thin thread surface 322 into which it is screwed. Therefore, the tapping can be further labor-saving.

As shown in FIGS. 10 and 11, the thread of the present invention may be a pentagonal thread 34. And it is provided in spiral arrangement of different angles and applies to wood of different materials.

[0011]

[Effect of the invention]

 The structure of the screw according to the present invention has a triangular screw, and has a function of tapping and expanding the wood, and the tapping operation can be easily performed, and the practicality, novelty, inventive step and Has industrial utility value.

[Brief description of the drawings]

FIG. 1 is a view showing the structure of a well-known screw.

FIG. 2 is a structural representation of British Patent No. 2040769A.

FIG. 3 is a structural view of British Patent No. 5044485.

FIG. 4 is a perspective view of the present invention.

FIG. 5 is a schematic view showing another embodiment of the present invention;

FIG. 6 is a schematic view showing another embodiment of the present invention;

FIG. 7 is a schematic view showing a working example of the present invention.

FIG. 8 is a schematic view showing a tapping embodiment of the present invention;

FIG. 9 is a schematic view showing a tapping embodiment of the present invention.

FIG. 10 is a schematic view showing another embodiment of the present invention;

FIG. 11 is a schematic view showing another embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 screw 32 triangular screw thread 10 screw 321 pointed part 100 screw 33 screw back 11 triangular screw thread 331 raised part 120 serrated screw thread 322 screw face 2 screw 5 wood 21 screw thread 51 opening 3 screw body 34 pentagon Thread 31 Spiral Circular Thread

Claims (3)

[Utility model registration claims] 1. A screw structure comprising a screw body and a helical circular thread provided at an upper end of the screw body, wherein a spiral triangular thread is provided at a lower end portion of the screw body. The three sides of the screw thread have an edge shape, and the pointed portion of each triangular screw thread and the screw body present a slanted screw back, and the connecting surface between the screw back and the screw body is A screw structure having an arc-shaped ridge and being capable of being tapped on wood. 2. The screw structure according to claim 1, wherein the screw thread at the lower end of the screw main body has a polygonal shape, and has an arrangement of the same angle or different angles. 3. The screw structure according to claim 1, wherein a triangular or polygonal screw thread at the lower end of the screw body is formed by directly twisting a circular material.