TWM573391U - Improved structure of self-tapping screw - Google Patents

Abstract

The present invention is a self-tapping screw improved structure having a screw head and a rod body disposed under the screw head, and the rod system includes a straight rod portion and a pointed tail portion, and the straight rod portion faces The outer edge of the tip end of the pointed tail is at least double-threaded, and the outer edge of the pointed tail extends from the tip end to an arc shape at the interface between the pointed tail portion and the straight portion. By extending the outer edge of the pointed tail from the tip end to the boundary between the pointed tail portion and the straight portion in an arc shape, the attack speed and the penetrating ability are improved, so that not only the screwing of the metal plate member but also the process of screwing the metal plate member The stable attack speed can be maintained to gradually expand the metal plate, so that no waste is generated, and the generation of the gap can be reduced without forming a reaming hole, thereby improving the biting ability.

Description

Self-tapping screw improved structure

This creation is about a screw structure, especially an improved structure of self-tapping screws that can improve the penetration.

According to the conventional drill-tipped screws (self-tapping screws), which are used for the fixed connection of the metal plate parts, and when they are used for the fixed connection, the drill tails of the self-drilling screws are directly screwed into the thin iron plates and utilized. The cutting portion and the thread are cut to achieve drilling, tapping, and locking. However, in the process of screwing the tail screw into the metal plate member, waste debris is generated and a reaming is formed, and a large gap is generated, so that the self-drilling screw can easily sway due to the gap, resulting in the screw of the self-drilling screw. Insufficient bite force.

In addition, the drill screw usually includes a straight rod portion and a drill tail portion, but the drill tail portion is coupled to the lower portion of the straight rod portion in a tapered shape, and forms a sharp corner at a joint of the drill tail portion and the straight rod portion. Therefore, when the drill screw is screwed into the metal plate member, stress is easily generated at the sharp corner, so that the drilling attack speed is weakened, and even the jam is stopped to stop the attack. Moreover, it is easy to form a hollow structure at the tip end of the drill tail at the time of manufacture, which also causes problems such as difficulty in drilling and attack.

Looking at the above, the creators of this creation have worked hard for many years. Research, think and design a self-tapping screw to improve the structure, in order to improve the lack of conventional technology, and thus enhance the implementation of the industry.

The main purpose of the present invention is to provide a self-tapping screw improved structure in which the outer edge of the pointed tail portion is curved rather than linearly extended from the tip end to the boundary between the pointed tail portion and the straight rod portion, and the conventional drill is removed. The stress generated by the tail screw at the sharp corners, in turn, achieves the effect of increasing the attack speed and the penetration ability. When the creation is screwed into the metal plate, not only the stable attack speed can be maintained, but also the metal plate member is gradually opened. No waste is generated, and the generation of the gap can be reduced without forming a reaming hole, thereby improving the biting ability.

Therefore, in order to achieve the above object, the present invention is a self-tapping screw improved structure having a screw head and a rod body disposed under the screw head, and the rod system includes a straight rod portion and a pointed tail portion. And the straight rod portion is provided with at least a double thread toward the outer edge of the tip end of the pointed tail portion, wherein the outer edge of the pointed tail portion extends from the tip end to the boundary between the pointed tail portion and the straight rod portion It is curved.

The self-tapping screw improved structure of the present invention, wherein the threaded thread comprises a first thread and a second thread, and the first thread and the second threaded thread extend from the straight rod portion toward a tip end of the pointed tail portion.

The self-tapping screw improved structure described above, wherein the thread further comprises a third thread and extends from the straight rod portion toward the tip end of the pointed tail together with the first thread and the second thread.

The self-tapping screw improved structure described above, wherein the tip end of the pointed tail portion is a solid structure.

The self-tapping screw improved structure described above, wherein the arc is an R angle.

The self-tapping screw improved structure described above, wherein the R angle forms an angle of 22R~32R.

The self-tapping screw improved structure is described, wherein a top surface of the screw head is provided with a concave hole portion.

The self-tapping screw improved structure is described, wherein the shape of the recessed portion is a cross shape, an inner hexagon shape, an outer hexagon shape, a quadrangular shape, a square shape or a plum shape.

The self-tapping screw improved structure described above, wherein the cross section of the straight portion is circular.

To sum up, this case is not only innovative in terms of space type, but also can enhance the above-mentioned multiple functions compared with customary articles. It should fully comply with the statutory new patent requirements of novelty and progressiveness, and apply in accordance with the law. This new type of patent application, to encourage creation, to the sense of virtue.

10‧‧‧ Self-tapping screws improved structure

11‧‧‧ screw head

111‧‧‧ recessed hole

12‧‧‧ rod body

121‧‧‧ Straight section

122‧‧‧ pointed tail

1221‧‧‧ tip

13‧‧‧ thread

131‧‧‧First thread

132‧‧‧second thread

14‧‧‧R angle

S‧‧‧ Junction

The first picture is a perspective view of the improved structure of the self-tapping screw of the creation.

Figure 2 is a side view of the improved structure of the self-tapping screw of the creation.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2.

Fig. 4 is a partial enlarged view of Fig. 3.

In the following, various embodiments are described in the drawings. Graphic and real In the embodiments, the same or similar reference numerals refer to the same, substantially identical, or functionally identical components and elements in all figures. The drawings are in a simplified form, and in all embodiments, the drawings are not drawn to exact dimensions.

It should be noted that the following description does not limit the technical means of the present invention to a particular structure or method embodiment. On the contrary, the technical means of the novel can be implemented in combination with other features, elements, methods or embodiments. The present invention is intended to be illustrative only and not to limit the scope of the present invention. The scope of the present invention is defined by the scope of the appended claims. Anyone with ordinary knowledge in the field can make some changes and refinements without departing from the spirit and scope of the present invention. The same elements in different embodiments will be denoted by the same reference numerals.

First, please refer to the first to fourth figures, the self-tapping screw improved structure 10 of the present invention has a screw head 11 and a rod body 12, and the rod body 12 is disposed under the screw head 11, and the rod body 12 is disposed under the screw head 11 The rod body 12 includes a straight rod portion 121 and a pointed tail portion 122, and the straight rod portion 121 is provided with at least a double thread 13 toward the outer edge of the tip end 1221 of the pointed tail portion 122, wherein the pointed tail portion 122 is The outer edge extends from the tip end 1221 to an arc of the junction between the pointed tail portion 122 and the straight rod portion 121, and is not linear, so that the whole of the pointed tail portion 122 is substantially curved, by The outer edge of the pointed portion 122 extends from the tip end 1221 to the outer edge of the straight rod portion 121 in an arc shape, and the stress generated by the conventional self-tapping screw at the sharp corner is removed, and the self-tapping screw improved structure 10 is raised. The attack speed is used to enhance the penetration ability. Therefore, in the process of screwing in the metal plate (not shown), not only can the stable attack speed be maintained, but the metal plate can be gradually opened, no waste is generated, and the gap can be reduced. , thereby improving the bite ability.

Then, the thread 13 includes a first thread 131 and a second thread 132 to form a double-threaded structure, and the first thread 131 and the second thread 132 are The straight rod portion 121 extends oppositely to the tip end 1221 of the pointed tail portion 122, thereby enhancing the biting force of the self-tapping screw improving structure 10 when the metal plate member is locked, and simultaneously improving the self-tapping screw improving structure 10 Attack speed. Alternatively, the thread 13 further includes a third thread (not shown), and together with the first thread 131 and the second thread 132, the straight rod portion 121 extends toward the tip end 1221 of the pointed tail portion 122 to form a three-tooth thread structure. .

In addition, the tip end portion 1221 of the pointed tail portion 122 is a solid structure to ensure that the self-tapping screw improved structure 10 can be stably screwed into the metal plate member, thereby avoiding problems such as difficulty in drilling and attack.

Next, please refer to FIG. 4 again, wherein the arc is an R angle 14 and the R angle 14 forms an angle of 22R~32R, so that the whole of the pointed portion 122 is substantially curved and borrowed. This reduces the resistance to drilling into the sheet metal part, thereby increasing its penetration.

Finally, the self-tapping screw improving structure 10 is provided with a concave hole portion 111 on the top surface of the screw head 11, and the concave hole portion 111 is shaped like a cross, an inner hexagon, an outer hexagon, a quadrangle, and a meter. Shapes such as glyphs or plums, even irregular shapes, but not limited to them. Further, the straight portion 121 has a circular cross section.

Therefore, the present invention does provide a self-tapping screw improved structure in which the outer edge of the pointed tail portion is curved rather than linearly extended from the tip end to the junction of the pointed tail portion and the straight rod portion, and the conventional drill tail screw is removed. The stress generated at the sharp corners, in turn, achieves the effect of increasing the attack speed and penetration ability. When the creation is screwed into the metal plate, not only can the stable attack speed be maintained, but the metal plate member is gradually opened, so it does not occur. The waste can reduce the generation of the gap without forming a reaming hole, thereby improving the biting ability.

In summary, it is only a preferred embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. The equivalent structural changes that are made by using the present specification and the contents of the schema are all included in the present creation. Within the scope, it is combined with Chen Ming.

Claims (9)

A self-tapping screw improved structure, comprising a screw head and a rod body, the rod system is disposed under the screw head, and the rod system comprises a straight rod portion and a pointed tail portion, and the straight rod portion faces the pointed tail portion The outer edge of the tip end is provided with at least double threads, and the outer edge of the pointed tail portion extends from the tip end to an arc shape at the interface between the pointed tail portion and the straight rod portion. The self-tapping screw improved structure of claim 1, wherein the threaded thread comprises a first thread and a second thread, and the first thread and the second threaded thread are opposite to the tip by the straight rod portion The tip of the tail extends. The self-tapping screw improved structure of claim 2, wherein the thread further comprises a third thread, and the first thread and the second thread extend from the straight portion toward the tip end of the pointed tail together with the first thread. The self-tapping screw improved structure according to any one of claims 1 to 3, wherein the tip end portion of the pointed tail portion is a solid structure. The self-tapping screw improved structure according to any one of claims 1 to 3, wherein the arc is an R angle. The self-tapping screw improved structure according to claim 5, wherein the R angle forms an angle of 22R to 32R. The self-tapping screw improved structure according to any one of claims 1 to 3, wherein the top surface of the screw head is provided with a recessed hole portion. The self-tapping screw improved structure according to claim 7, wherein the concave hole portion has a shape of a cross, an inner hexagon, an outer hexagon, a quadrangle, a m-shaped or a plum. The self-tapping screw improved structure according to any one of claims 1 to 3, wherein the cross section of the straight portion is circular.