CN220286160U

CN220286160U - Self-tapping screw

Info

Publication number: CN220286160U
Application number: CN202322045892.4U
Authority: CN
Inventors: 陈惠惠; 张兰; 吴海应; 张小荛
Original assignee: Jiaxing Dali Precision Fastener Co ltd
Current assignee: Jiaxing Dali Precision Fastener Co ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-01-02
Anticipated expiration: 2033-07-31

Abstract

The utility model belongs to the technical field of screws, and particularly relates to a self-tapping screw. It solves current self-tapping screw deckle edge and turns up and make the drill way unevenness. Self-tapping screw includes the nail cap and connects in the nail body of nail cap, and the external diameter of nail cap is from keeping away from the one end of nail body to be close to the one end of nail body and increase gradually to form annular cutting edge at the one end that the nail cap is close to the nail body, be equipped with first external screw thread and the second external screw thread that set gradually from nail body front end to the rear end on the nail body, the spiral direction of first external screw thread is opposite with the spiral direction of second external screw thread, and the external diameter of second external screw thread is greater than the external diameter of first external screw thread. The application has the advantages that: the problem that the orifice is uneven due to eversion of burrs is solved, the annular cutting edge is arranged on the nail cap close to one end of the nail body, the annular cutting edge cuts off the burrs to avoid eversion of the burrs, and the connection stability is guaranteed by combining the first threads and the second threads to press scraps into an implantation hole.

Description

Self-tapping screw

Technical Field

The utility model belongs to the technical field of screws, and particularly relates to a self-tapping screw.

Background

The tapping screw is quite common connecting piece in the fitment, makes to carry out the screw interlock with timber through rotating the tapping screw head, and the tapping screw is difficult to be had deckle edge and sweeps with timber screw thread interlock in-process, and current tapping screw is usually through the tapping screw head with sweeps impress into the implantation hole, but does not solve deckle edge problem, because can't block the deckle edge and cause deckle edge to turn up and make the drill way uneven, to this, need improve the tapping screw.

For example, chinese patent discloses a floor screw chinese patent number [ CN201620895584.8 ], a floor screw comprising a screw head having a screw driving groove and a screw shaft connected to the screw head, the screw shaft having a double-thread provided at an end thereof remote from the screw head; a plurality of diagonal knurled edges are arranged in the circumferential direction of the screw rod, the diagonal knurled edges are positioned between the screw head and the double-line threads, and the rotation directions of the diagonal knurled edges are consistent with the rotation directions of the double-line threads; the double-thread comprises a first thread and a second thread, wherein the outer diameter of the first thread is larger than that of the second thread; the end of the screw rod far away from the head of the screw is provided with a tip part; and the screw is also provided with a cutting groove, the extending direction of the cutting groove is consistent with the axial direction of the screw, and the cutting groove is cut with the first thread. When this scheme was used for opening the connection between floor and the floor fossil fragments, need not pre-drilling in advance, only can accomplish the installation with the mode of screwing, and can be with the floor screw anti-spin withdraws from when needing, accomplishes the dismantlement, and can not cause the characteristics of the damage on floor.

Although the above solution has the above technical effects, the technical problem mentioned is not solved.

Disclosure of Invention

The present utility model has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present utility model is to provide a tapping screw which solves the above-mentioned problems.

The aim of the utility model can be achieved by the following technical scheme:

this self-tapping screw include the nail cap and connect in the nail body of nail cap, the external diameter of nail cap is followed and is kept away from the one end of nail body is close to the one end of nail body increases gradually, and the nail cap is close to the one end of nail body forms annular cutting edge be equipped with on the nail body follow nail body front end is to the first external screw thread and the second external screw thread that the rear end set gradually, the spiral direction of first external screw thread with the spiral direction of second external screw thread is opposite, and the external diameter of second external screw thread is greater than the external diameter of first external screw thread.

In the self-tapping screw, the pitch of the second external thread is larger than that of the first external thread.

In the self-tapping screw, one end face of the screw cap, which is close to the screw body, is a circular conical surface.

In the self-tapping screw, the length of the first external thread is longer than that of the second external thread.

In the self-tapping screw, the first external thread is connected with the second external thread.

In the self-tapping screw, the cross section of the screw body is any one of a circle and a triangle.

In the self-tapping screw, the shank includes a front section portion having a tip and a rear section portion connected to a rear end of the front section portion, the first external thread is provided on the front section portion, and the second external thread is provided on the rear section portion.

In the self-tapping screw described above, the diameter of the front section is smaller than the diameter of the rear section.

In the self-tapping screw, the rear end of the nut is provided with the tool matching groove.

The self-tapping screw is characterized in that the tool matching groove is any one of a plum blossom groove, a cross groove and a straight groove.

Compared with the prior art, the self-tapping screw has the following beneficial effects:

the problem that the orifice is uneven due to eversion of burrs is solved, the outer diameter of the nut is gradually increased from one end far away from the shank to one end close to the shank to form an annular cutting edge, burrs are avoided from everting by cutting off the burrs through the annular cutting edge, and meanwhile, the first threads and the second threads are combined so as to press scraps in an implantation hole, so that the connection stability between the tapping screw and wood is ensured.

Drawings

Fig. 1 is a schematic structural view of a tapping screw according to an embodiment of the present utility model.

Fig. 2 is a schematic view of another view structure of fig. 1.

Fig. 3 is a full cross-sectional view of fig. 1.

In the figure, a nut 1, a circular cone 11, a fitting groove 12, a shank 2, a front section 21, a rear section 22, a notch 221, an annular blade 3, a first external thread 4, and a second external thread 5.

Detailed Description

The following are specific embodiments of the utility model and the technical solutions of the utility model will be further described with reference to the accompanying drawings, but the utility model is not limited to these embodiments.

Example 1

As shown in fig. 1 to 3, the self-tapping screw includes a nut 1 and a shank 2 connected to the nut 1, an outer diameter of the nut 1 is gradually increased from an end far from the shank 2 to an end near the shank 2, and an annular blade 3 is formed at an end of the nut 1 near the shank 2, a first external thread 4 and a second external thread 5 are provided on the shank 2 in order from a front end to a rear end of the shank 2, a screw direction of the first external thread 4 and a screw direction of the second external thread 5 are opposite, and an outer diameter of the second external thread 5 is larger than an outer diameter of the first external thread 4. Specifically, in this embodiment, the nut 1 is in a round table shape, when the tapping screw is drilled into the wood, the nut 1 is pressed on the wood to ensure the connection stability between the tapping screw and the wood, and the combination of the annular blade 3 cuts off the carried waste scraps and burrs at the implantation hole to prevent the uneven hole caused by the burr eversion, specifically, for example, the first external thread 4 is a positive thread, the second external thread 5 is a negative thread, the rear section 22 of the shank 2 is provided with a cutting groove 221, the extending direction of the cutting groove 221 is consistent with the axial direction of the rear section 22, the cutting groove 221 is cut with the first external thread 4, the wood waste scraps are pressed in the implantation hole through the cutting groove 221, the first external thread 4 and the second external thread 5, and since the outer diameter of the second external thread 5 is larger than that of the first external thread 4, the thread connection stability between the tapping screw and the wood is ensured, and the screwing effect of the tapping screw can be mutually consistent, so that the tapping effect of the tapping screw is not repeated.

To achieve the drilling of the second external thread 5 into the wood, the pitch of the second external thread 5 is larger than the pitch of the first external thread 4, as shown in fig. 1 and 3. So that the second external thread 5 is meshed in the implantation hole, the situation that the positive and negative threads are reversely threaded is avoided, and the threaded engagement force of the second external thread 5 to the implantation hole is larger than that of the first external thread 4 by enlarging the screw pitch and the outer diameter of the second external thread 5, so that the threaded connection of the positive and negative threads and the implantation hole is realized. Specifically, in this embodiment, a space is left between the end of the second external thread 5, which is close to the nut 1, and the nut 1, so as to facilitate the burr cutting.

In order to form the annular cutting edge 3 conveniently, specifically, an end face of the nut 1, which is close to the shank 2 in the embodiment, is an annular conical surface 11. The annular cutting edge 3 is formed between the conical surface 11 of the circular ring and the matching groove 12 so as to cut off burrs and avoid the burrs from turning outwards.

In order to achieve a good thread fixing effect of the tapping screw, as shown in fig. 1 to 3, the length of the first external thread 4 is longer than that of the second external thread 5.

Specifically, the first external thread 4 and the second external thread 5 are connected in this embodiment. The integrity between the thread teeth is realized, and the engagement resistance caused by disconnection between the thread teeth is effectively avoided.

To facilitate the drilling of self-tapping screws into wood, the shank 2 has any one of a circular shape and a triangular shape in cross section, as shown in fig. 1. The shank 2 in the embodiment is circular to reduce the stress surface at the implantation hole to avoid cracking of wood caused by excessive stress, but the utility model is not limited thereto.

In order to ensure the connection stability of the tapping screw, as shown in fig. 1 to 3, specifically, the shank 2 of the present embodiment includes a front section 21 having a pointed end and a rear section 22 connected to the rear end of the front section 21, the first external thread 4 is provided at the front section 21, and the second external thread 5 is provided at the rear section 22.

To achieve a better drilling of the tapping screw into the wood, the diameter of the front section 21 is smaller than the diameter of the rear section 22, as shown in fig. 1 and 2.

In order to realize the self-tapping screw penetration adjustment, as shown in fig. 1 and 2, a tool-engaging groove 12 is provided at the rear end of the nut 1.

Specifically, the tool engaging groove 12 in this embodiment is any one of a plum blossom groove, a cross groove, and a straight groove. The self-tapping screw is smoothly screwed into the hard wood to finish installation through the tool matching groove 12, different screwing driving forces are met through different grooves, and the problem that the self-tapping screw cannot be installed and taken out due to abrasion and slipping is avoided.

Although the terms of the nut 1, the circular cone 11, the fitting groove 12, the shank 2, the front section 21, the rear section 22, the cutting groove 221, the annular blade 3, the first external thread 4, the second external thread 5, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Claims

1. The utility model provides a self-tapping screw, includes nail cap (1) and connect in nail body (2) of nail cap (1), its characterized in that, the external diameter of nail cap (1) is followed and is kept away from the one end of nail body (2) is close to the one end of nail body (2) increases gradually, and nail cap (1) is close to one end of nail body (2) forms annular cutting edge (3) be equipped with on nail body (2) follow first external screw thread (4) and second external screw thread (5) that nail body (2) front end set gradually to the rear end, the spiral direction of first external screw thread (4) with the spiral direction of second external screw thread (5) is opposite, and the external diameter of second external screw thread (5) is greater than the external diameter of first external screw thread (4).

2. A tapping screw according to claim 1, characterized in that the pitch of the second external thread (5) is greater than the pitch of the first external thread (4).

3. A tapping screw as claimed in claim 1, wherein an end surface of the nut (1) close to the shank (2) is a circular conical surface (11).

4. A tapping screw as claimed in claim 1, characterized in that the length of the first external thread (4) is longer than the length of the second external thread (5).

5. A tapping screw according to claim 1, characterized in that the first external thread (4) and the second external thread (5) are connected.

6. A tapping screw as in claim 1, wherein the shank (2) has any one of a circular and triangular cross section.

7. A tapping screw as claimed in claim 1, wherein the shank (2) comprises a front section (21) having a pointed end and a rear section (22) connected to the rear end of the front section (21), the first external thread (4) being provided on the front section (21) and the second external thread (5) being provided on the rear section (22).

8. A tapping screw as claimed in claim 7, wherein the diameter of the front section (21) is smaller than the diameter of the rear section (22).

9. A tapping screw as claimed in claim 1, wherein a tool engaging groove (12) is provided at the rear end of the nut (1).

10. A tapping screw as claimed in claim 9, wherein the tool engaging groove (12) is any one of a plum blossom groove, a cross groove and a straight groove.