Straw rope nail

Abstract

The utility model discloses a straw rope nail which comprises a screw body, a screw head and a straw line section, and threads are arranged on the screw body. A tail cutting groove is formed in the tip of the screw body, a rotating part is arranged on the upper end face of the screw head, a first optical axis section is arranged between the grass line section and the end, away from the tip, of the screw body, and a second optical axis section is arranged between the end, away from the first optical axis section, of the grass line section and the screw head. A plurality of protrusions are evenly distributed on the peripheral face of the side, close to the second optical axis section, of the screw head. Compared with a straw rope nail in the prior art, the straw rope nail has the advantages that the inclined surfaces can be inserted into a wood quilt in an occlusion manner, so that the self-locking force of the straw rope nail can be more effectively improved, and the problem of loosening caused by reverse rotation of the straw rope nail is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to a straw rope nail. Background Art

[0002] Straw rope nails are often used for wood connection. The straw rope nail with patent application number 202221180651.X includes a screw body and a screw head; the screw body includes a tip, a threaded section, a transition section, a grass pattern section and a bare rod section arranged in sequence; wherein a cutting tail groove is arranged at the tip, and a discharge notch is arranged on each thread section of the threaded section, and the transition section has an enlarged step seat along the tip to the grass pattern section; the grass pattern section includes a plurality of wings distributed in a rotation direction, and the rotation direction of the wing is the same as the penetration direction of the screw head. When the straw rope nail of the utility model is penetrated into the wooden board, wood chips can be discharged from the discharge notch of each thread section of the threaded section along the cutting tail groove, which greatly improves the penetration speed of the straw rope nail; in addition, the self-locking force of the straw rope nail after penetrating the wooden board is provided by the grass pattern section, which greatly improves the self-locking performance of the straw rope nail. However, after actual use, it is found that the above-mentioned straw rope nail is still more prone to loosening when used in some occasions with high frequency of use or vibration and shaking. Summary of the invention

[0003] The utility model aims to provide a straw rope nail, which is intended to solve the problem that the existing straw rope nails have poor self-locking ability after installation and are prone to loosening when used in some frequent use or vibration and shaking occasions.

[0004] In order to solve the above technical problems, the purpose of the utility model is achieved as follows:

[0005] A grass rope nail comprises a screw body, a screw head and a grass pattern section, wherein the screw body is provided with screw threads; the tip of the screw body is provided with a tail cutting groove, and the upper end surface of the screw head is provided with a rotating portion, characterized in that a first optical axis section is provided between the grass pattern section and an end of the screw body away from the tip, and a second optical axis section is provided between an end of the grass pattern section away from the first optical axis section and the screw head; a plurality of protrusions are evenly distributed on the outer peripheral surface of the screw head adjacent to the second optical axis section; each of the protrusions has an inclined surface, and the inclination direction of the inclined surface is opposite to the rotation direction of the screw threads of the screw body.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: during the cold heading process, the cold heading machine mold extrude and cut the connection between the second optical axis segment and the screw head toward the outer peripheral surface of the screw head to form an incision, and one side of the incision is extruded and raised to form the protrusion, and the adjacent surfaces of the incision and the protrusion are inclined surfaces.

[0007] On the basis of the above solution and as a preferred solution of the above solution: the protrusion transitions to the arc of the outer peripheral surface away from the side where the incision is located.

[0008] On the basis of the above solution and as a preferred solution of the above solution: the screw head is conical.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: a plurality of notches are arranged on the screw thread, the notches are distributed in a spiral shape, and the rotation direction is opposite to the rotation direction of the screw thread.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the grass pattern segment is conical, and the outer diameter of one end adjacent to the first optical axis segment is close to the outer diameter of the first optical axis segment and smaller than the outer diameter of one end adjacent to the second optical axis segment.

[0011] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects: during the cold heading process, the mold punches out an incision on the outer peripheral surface of the screw head, and causes it to bulge during the punching and extrusion to form a protrusion, the adjacent surfaces of the incision and the protrusion are inclined surfaces, and the inclination direction of the inclined surface is opposite to the screw thread direction of the screw body, so that compared with the straw rope nail in the prior art, the inclined surface of the incision can bite and insert into the wood, thereby being able to more effectively improve the self-locking force of the straw rope nail and prevent the straw rope nail from loosening due to reverse rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a three-dimensional schematic diagram of the screw head structure;

[0014] Figure 3 It is the main view of the screw head structure;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the screw head from another angle;

[0016] Figure 5 This is the cross-sectional view at AA in 3. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution in the embodiment will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of this application, not all embodiments. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] See Figure 1-5 As shown, the present application discloses a grass rope nail, comprising a screw body 10, a screw head 14 and a grass pattern section 12, the screw body 10 is provided with a screw thread; the tip 101 of the screw body 10 is provided with a tail cutting groove 16, the upper end surface of the screw head 14 is provided with a rotating portion, a first optical axis section 11 is provided between the grass pattern section 12 and an end of the screw body 10 away from the tip, and a second optical axis section 13 is provided between an end of the grass pattern section 12 away from the first optical axis section 11 and the screw head 14; a plurality of protrusions 15 are evenly distributed on the outer peripheral surface 142 of the screw head 14 adjacent to the second optical axis section 13; each protrusion 15 has an inclined surface 151, and the inclination direction of the inclined surface 151 is opposite to the rotation direction of the screw thread of the screw body 10. Specifically, during the cold heading process of the straw rope nail, under the action of the cold heading die, the connection between the second optical axis section 13 and the screw head 14 is extruded and cut toward the outer peripheral surface 142 of the screw head 14 to form a cut 1421, and one side of the cut 1421 is extruded and raised to form a protrusion 15, and the adjacent surfaces of the cut 1421 and the protrusion 15 are inclined surfaces 151. Then, during the cold heading process, the die punches out a cut on the outer peripheral surface of the screw head, and causes a protrusion to be raised during the punching and extrusion, forming a protrusion, and the adjacent surfaces of the cut and the protrusion are inclined surfaces, and the inclination direction of the inclined surface is opposite to the screw thread rotation direction of the screw body. In this way, compared with the straw rope nails in the prior art, in which the head of the straw rope nail is provided with a ridge as an anti-loosening structure, the inclined surface of the cut can be more effectively inserted into the wood, thereby effectively improving the self-locking force of the straw rope nail and preventing the straw rope nail from loosening due to reverse rotation. Of course, in order to reduce the rotational resistance of the rope nail when it is screwed into the wood, the present embodiment preferably has the protrusion 15 transition in an arc to the lateral outer surface 142 where the cutout 1421 is located. This arc transition can minimize the rotational resistance of the rope nail when it is screwed into the wood even if the protrusion 15 is present, thereby reducing the torque requirement for the installation tool.

[0020] In addition, the screw head 14 is preferably conical. Since the cold heading machine die stamping is linear, the height of the protrusion 15 gradually increases from the second optical axis section 13 to the screw head 14, and the depth of the cutout 1421 will inevitably increase; that is, the rope nail is completely screwed into the wood, and the larger the area and depth of the cutout 1421 that bites the wood, the greater the self-locking and loosening effect will inevitably be.

[0021] In order to improve the chip removal ability of the rope nail and avoid excessive rotation resistance due to excessive chip accumulation, a plurality of notches 102 are provided on the screw thread. The notches are distributed in a spiral shape, and the rotation direction is opposite to that of the screw thread, so that chips can be removed through the notches 102.

[0022] Of course, the grass pattern section of the traditional grass rope nail is straight, and its self-locking ability is limited. For this reason, the present embodiment further preferably has the grass pattern section 12 as a cone, and the outer diameter of the end adjacent to the first optical axis section 11 is close to the outer diameter of the first optical axis section 11, and is smaller than the outer diameter of the end adjacent to the second optical axis section 13. That is to say, the diameter of the second optical axis section 13 is larger than the diameter of the first optical axis section 11, and the diameter difference is 0.5-1mm, so that the bite degree between the grass pattern section 12 and the wood hole is enhanced, thereby enhancing the self-locking ability and improving its anti-loosening performance.

[0023] Based on the above, compared with traditional straw rope nails, the straw rope nails of the present application have better self-locking performance, so in places with frequent activities or vibrations, they can better prevent loosening and ensure the reliability of the connection for a long time.

[0024] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grass rope nail, comprising a screw body (10), a screw head (14) and a grass pattern section (12), wherein the screw body (10) is provided with a screw thread; a tip (101) of the screw body (10) is provided with a cutting tail groove (16), and an upper end surface of the screw head (14) is provided with a rotating portion, characterized in that: A first optical axis section (11) is provided between the grass pattern section (12) and an end of the screw body (10) away from the tip, and a second optical axis section (13) is provided between an end of the grass pattern section (12) away from the first optical axis section (11) and the screw head (14); a plurality of protrusions (15) are evenly distributed on the outer peripheral surface (142) of the screw head (14) on the side adjacent to the second optical axis section (13); each of the protrusions (15) has an inclined surface (151), and the inclination direction of the inclined surface (151) is opposite to the screw thread direction of the screw body (10).

2. A straw rope nail according to claim 1, characterized in that: During the cold heading process, the cold heading machine die extrudes and cuts the connection between the second optical axis segment (13) and the screw head (14) toward the outer peripheral surface (142) on this side of the screw head (14) to form a cut (1421), and one side of the cut (1421) is extruded and raised to form the protrusion (15), and the adjacent surfaces of the cut (1421) and the protrusion (15) are inclined surfaces (151).

3. The straw rope nail according to claim 2, characterized in that: The protrusion (15) transitions in an arc shape toward the outer peripheral surface (142) on the side away from the cutout (1421).

4. The straw rope nail according to claim 1, characterized in that: The screw head (14) is conical.

5. The straw rope nail according to claim 1, characterized in that: A plurality of notches (102) are provided on the screw thread, the notches are distributed in a spiral shape, and the direction of rotation is opposite to that of the screw thread.

6. The straw rope nail according to claim 1, characterized in that: The grass pattern segment (12) is conical, and the outer diameter of one end adjacent to the first optical axis segment (11) is close to the outer diameter of the first optical axis segment (11), and is smaller than the outer diameter of one end adjacent to the second optical axis segment (13).

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