Umbrella-shaped barb rivet

Abstract

The utility model discloses an umbrella-shaped barb rivet, belongs to the technical field of rivets, and solves the problem that an existing rivet is insufficient in anchoring performance. The utility model discloses an umbrella-shaped rivet which comprises a rivet rod, a rivet cap is arranged at the top of the rivet rod, a rivet head is arranged at the bottom of the rivet rod, and a plurality of barbs are arranged on the circumferential edge of the rivet head and distributed in an inverted umbrella shape. The barbs are arranged at the bottom of the rivet rod, so that the anchoring performance of the rivet is greatly improved; the multiple barbs can be scattered in the direction away from the rivet rod in the rivet pulling-out process, and therefore the multiple barbs can provide reverse anchoring force for the rivet, and the rivet cannot be easily pulled out of a base body. Due to the fact that the multiple barbs are distributed in the umbrella shape and obliquely arranged, the multiple barbs are of a spiral structure, in the rivet pulling-out process, the multiple barbs can provide rotating force for the rivet rod, when the rotating force is distributed to the horizontal direction, only axial friction is converted into rotating friction, and the friction force between the rivet rod and a base body is greatly increased.

Description

Technical Field

[0001] The utility model relates to the technical field of rivets, in particular to an umbrella-shaped barbed rivet. Background Art

[0002] Rivets are nail-shaped objects with through holes and a cap on one end. In riveting, the riveted parts are connected by using their own deformation or interference. The core of rivets is to connect two objects. Once the anchoring fails, the rivet will lose any value and will also cause certain damage to the connected parts. Therefore, it is very important to ensure the anchoring performance of the rivet.

[0003] Traditional rivets have certain limitations in their application scope. To pull traditional rivets out of the substrate, it is necessary to overcome the friction between the rivet rod and the substrate. The force-bearing mode is single and only suitable for connecting thin substrates or substrates that require a deeper riveting depth. The substrate is prone to cracking during the riveting process, making it impossible for the substrate to effectively squeeze the rivet and provide friction for the rivet, which leads to anchor debonding failure. The only option is to replace the rivet point, which is time-consuming and labor-intensive and may miss the best riveting point. Moreover, traditional rivets require greater pressure to drive the rivets into the connected components, and when the force is too large, the anchor hole of the brittle substrate will crack, causing anchor failure, seriously affecting its use. Utility Model Content

[0004] In view of the above problems in the prior art, the utility model provides an umbrella-shaped barbed rivet, which solves the problem of insufficient anchoring performance of the prior rivets.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] Provided is an umbrella-shaped barb rivet, comprising a rivet rod, a rivet cap is arranged on the top of the rivet rod, a nail head is arranged on the bottom of the rivet rod, a plurality of barbs are arranged on the circumference of the nail head, the plurality of barbs are distributed in an inverted umbrella shape, and the free ends of the plurality of barbs are all inclinedly arranged.

[0007] The working principle of this scheme is as follows: when the rivet is driven into the substrate, since the multiple barbs will spread away from the rivet rod during the process of pulling out the rivet, the multiple barbs will be reversely riveted into the substrate, so that the multiple barbs will provide a reverse anchoring force for the rivet, so that the rivet will not be easily pulled out of the substrate. And since the multiple barbs are distributed in an umbrella shape and tilted, the multiple barbs are in a spiral structure, so that during the process of pulling out the rivet, the multiple barbs will provide a rotational force for the rivet rod. When the rotational force is distributed in the horizontal direction, it will push the rivet rod to rotate, provide rotational potential energy for the rivet rod, and convert the axial friction into rotational friction, which greatly increases the friction between the rivet rod and the substrate.

[0008] Furthermore, the rivet cap comprises a cylindrical base, the upper surface of which is convex upward and spherical. The rivet cap's upper surface is convex upward, which can improve the rivet cap's pressure resistance, making it less likely to deform and ensuring the use effect.

[0009] Furthermore, the height of the rivet cap is 7.5 mm, the height of the base of the rivet cap is 2.5 mm, and the diameter of the base of the rivet cap is 20 mm.

[0010] Furthermore, a plurality of spherical protrusions are evenly arranged on the rivet rod, the plurality of protrusions are distributed in a circular pattern, the plurality of protrusions correspond to the plurality of barbs in a one-to-one relationship, and the circumferential projection position of each protrusion is located at the middle of the top end of the corresponding barb. The protrusions are arranged to create an inclined angle for the free ends of the plurality of barbs in advance during the rivet extraction process, to help the plurality of barbs spread out, and to avoid the situation where the plurality of barbs are attached to the rivet rod and cannot be spread out.

[0011] Furthermore, the diameter of the protrusion is 0.1 mm.

[0012] Furthermore, the length of the rivet rod is 20 mm, and the diameter of the rivet rod is 3 mm.

[0013] Furthermore, the length of the nail head is 4.5 mm, and the cone angle of the nail head is 18°.

[0014] Furthermore, the arc length of the top spacing between two adjacent barbs is 1.6 mm, the arc length of the bottom spacing between two adjacent barbs is 0.6 mm, and the inclination angle of each barb is 30°.

[0015] Furthermore, the outer surfaces of the rivet cap, the rivet rod and the barb are all provided with an electrophoretic coating layer. The provision of the electrophoretic coating layer can protect the rivet cap and the rivet rod, improve the corrosion resistance, water resistance and chemical resistance of the rivet, so that the rivet can be used for a long time in areas with heavy rain or in an environment with high air humidity, saving use costs and resources.

[0016] The utility model discloses an umbrella-shaped barbed rivet, which has the following beneficial effects:

[0017] 1. Compared with the existing rivets, the utility model greatly improves the anchoring performance of the rivet by arranging multiple barbs at the bottom of the rivet rod; the multiple barbs will spread away from the rivet rod during the process of pulling out the rivet, that is, the multiple barbs will be reversely riveted into the substrate, so that the multiple barbs will provide a reverse anchoring force for the rivet, so that the rivet will not be easily pulled out of the substrate.

[0018] 2. The multiple barbs of the utility model are distributed in an umbrella shape and arranged obliquely, so that the multiple barbs are in a spiral structure. Therefore, during the rivet extraction process, the multiple barbs will provide a rotational force for the rivet rod. When the rotational force is distributed in the horizontal direction, it will push the rivet rod to rotate, providing rotational potential energy for the rivet rod, converting only axial friction into rotational friction, and greatly increasing the friction between the rivet rod and the substrate.

[0019] 3. The utility model improves the application scope of rivets, so that rivets are not limited to connecting thinner connecting parts; the existing rivets rely only on the friction between the rivet rod and the substrate for anchoring, so they are only suitable for connecting thinner substrates or substrates that require a deeper riveting depth. However, the rivet of this solution is composed of two parts because its force-bearing mode only requires riveting multiple barbs into the substrate to achieve a certain anchoring effect, so that the application scope of rivets is not limited to thin connecting parts, and under the working conditions of substrates that require a deeper riveting depth, the anchoring force provided by the umbrella-shaped barbs can reduce the riveting depth to a certain extent, which not only saves costs, but also opens up some anchoring working conditions, such as working conditions on substrates that cannot provide a longer riveting depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of an umbrella-shaped barbed rivet;

[0021] Figure 2 for Figure 1 Schematic diagram of the cross section of AA;

[0022] Figure 3 A three-dimensional diagram of an umbrella-shaped barbed rivet;

[0023] Among them: 1. Rivet cap; 2. Rivet rod; 3. Barb; 4. Protrusion. DETAILED DESCRIPTION

[0024] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0025] refer to Figure 1 to Figure 3 The present embodiment provides an umbrella-shaped barb rivet, comprising a rivet rod 2, a rivet cap 1 is arranged on the top of the rivet rod 2, a nail head is arranged at the bottom of the rivet rod 2, a plurality of barbs 3 are arranged on the circumference of the nail head, the plurality of barbs 3 are distributed in an inverted umbrella shape, and the free ends of the plurality of barbs 3 are all inclined.

[0026] The rivet of this embodiment is also driven into the base by hammering and pressing like the existing rivets. Since gaps are left between the multiple barbs 3, the multiple barbs 3 will gradually shrink and enter the base when being driven into the base, that is, the multiple barbs 3 will spread away from the rivet rod 2 during the process of pulling out the rivet, and the multiple barbs 3 will be riveted into the base in the reverse direction, so that the multiple barbs 3 will provide a reverse anchoring force for the rivet, so that the rivet will not be easily pulled out of the base.

[0027] Since the multiple barbs 3 are distributed in an umbrella shape and are inclined, the multiple barbs 3 are in a spiral structure. Therefore, during the rivet extraction process, the multiple barbs 3 will provide a rotational force for the rivet rod 2. When the rotational force is distributed in the horizontal direction, it will push the rivet rod 2 to rotate, provide rotational potential energy for the rivet rod 2, and convert only axial friction into rotational friction, which greatly increases the friction between the rivet rod 2 and the substrate, and further provides high anchoring performance.

[0028] Since the plurality of barbs 3 need to be spread out to be in contact with the substrate, they are riveted into the substrate with the pulling force to provide an anchoring force. The substrate of this embodiment is an elastic substrate, a flexible substrate, a non-rigid substrate, etc.

[0029] Specifically, the rivet cap 1 comprises a cylindrical base, the upper surface of which is convex upward and spherical. The rivet cap 1 is convex upward, which can improve the compression resistance of the rivet cap 1, making it less likely to deform and ensuring the use effect.

[0030] As a further solution of this embodiment, a plurality of spherical protrusions 4 are evenly arranged on the rivet rod 2, the plurality of protrusions 4 are distributed in a circular shape, the plurality of protrusions 4 are in a one-to-one correspondence with the plurality of barbs 3, and the circumferential projection position of each protrusion 4 is located at the middle of the top end of the corresponding barb 3. The protrusions 4 are arranged to create an inclined angle for the free ends of the plurality of barbs 3 in advance during the rivet extraction process, so as to help the plurality of barbs 3 spread out and avoid the situation where the plurality of barbs 3 are attached to the rivet rod 2 and cannot be spread out.

[0031] As a further solution of this embodiment, the outer surfaces of the rivet cap 1, the rivet rod 2 and the barb 3 are all provided with an electrophoretic coating layer. The provision of the electrophoretic coating layer can protect the rivet cap 1 and the rivet rod 2, improve the corrosion resistance, water resistance and chemical resistance of the rivet, so that the rivet can be used for a long time in areas with heavy rain or in an environment with high air humidity, saving use costs and resources.

[0032] Preferably, but not limited to, the number of barbs 3 in this embodiment is 6, the height of the rivet cap 1 is 7.5 mm, the height of the base of the rivet cap 1 is 2.5 mm, and the base diameter of the rivet cap 1 is 20 mm. The diameter of the protrusion 4 is 0.1 mm. The length of the rivet rod 2 is 20 mm, and the diameter of the rivet rod 2 is 3 mm. The length of the nail head is 4.5 mm, and the cone angle of the nail head is 18°. The arc length of the top spacing between two adjacent barbs 3 is 1.6 mm, the arc length of the bottom spacing between two adjacent barbs 3 is 0.6 mm, and the inclination angle of each barb 3 is 30°.

[0033] The processing method of the rivet in this embodiment is the same as the existing rivet manufacturing method, which is also an integral casting process. The rivet rod 2, the rivet cap 1 and the plurality of barbs 3 are integrally cast and formed. In order to save costs and reduce the difficulty of construction, the plurality of barbs 3 are first made into a hollow truncated cone structure, and after forming, a cutting tool is used to cut and divide according to the shape and size of the umbrella-shaped barbs, and the connection between the plurality of barbs 3 and the rivet rod 2 must be ensured during cutting.

[0034] The working principle of this embodiment is:

[0035] Since the initial shapes of the multiple barbs 3 are changed during the riveting process, the multiple barbs 3 have elastic potential energy to restore their original shapes, which makes it possible for the subsequent reverse riveting of the barbs 3 into the substrate.

[0036] When the rivet is pulled out, the friction between the rivet rod 2 and the base body will first resist the pull-out force. When the pull-out force is greater than the friction force, the rivet will be slightly displaced, and the multiple barbs 3 will spread out and rivet into the base body, generating an anchoring force in the opposite direction of the pull-out direction to prevent the rivet from being pulled out. When the pull-out force is greater than the maximum anchoring force that can be provided by the structural properties of the rivet material, the multiple barbs 3 will twist and break, and the anchoring structure will fail.

[0037] When the rivet is pulled out, due to the different riveting depths, the pull-out force mode can be divided into two categories:

[0038] The first category is that the riveting depth is greater than the area of ​​multiple barbs 3. When the rivet is pulled out, the friction between the rivet rod 2 and the matrix is ​​used as the first line of defense to balance the pull-out force. At this time, the maximum pull-out force that can be generated is equal to the maximum friction between the rivet rod 2 and the matrix. When the pull-out force is greater than the friction force, the rivet begins to loosen and slightly displace, and the multiple barbs 3 will spread out and gradually rivet into the matrix, and generate an anchoring force in the opposite direction of the pull-out to prevent the rivet from being pulled out. At this time, the pull-out force that can be generated is the combined force of the friction force and the anchoring force. When the difference between the pull-out force and the friction force is greater than the bearing capacity of the multiple barbs 3, the multiple barbs 3 will gradually twist and break, and the anchoring structure will fail. At this time, the force generated is the maximum pull-out force of the multiple barb 3 rivets.

[0039] The second type is that the rivet penetration depth is equal to the area of ​​multiple barbs 3 (the condition of thicker connectors). Since the contact surface between the rivet rod 2 and the substrate is very small, the friction generated is very small and can be ignored. Therefore, as the pull-out force appears, the rivet will loosen and move, and multiple barbs 3 will be riveted into the substrate to prevent the rivet from being pulled out. At this time, the maximum pull-out force that can be generated is the anchoring force of multiple barbs 3.

[0040] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. An umbrella-shaped barb rivet, characterized in that: The invention comprises a rivet rod (2), wherein a rivet cap (1) is arranged at the top of the rivet rod (2), a nail head is arranged at the bottom of the rivet rod (2), a plurality of barbs (3) are arranged on the circumference of the nail head, the plurality of barbs (3) are arranged in an inverted umbrella shape, and the free ends of the plurality of barbs (3) are arranged obliquely.

2. The umbrella-shaped barb rivet according to claim 1, characterized in that: The rivet cap (1) comprises a cylindrical base, the upper surface of which is convex upward and spherical.

3. The umbrella-shaped barb rivet according to claim 2, characterized in that: The height of the rivet cap (1) is 7.5 mm, the height of the base of the rivet cap (1) is 2.5 mm, and the diameter of the base of the rivet cap (1) is 20 mm.

4. The umbrella-shaped barb rivet according to claim 1, characterized in that: The rivet rod (2) is evenly provided with a plurality of spherical protrusions (4), the plurality of protrusions (4) are distributed in a circular shape, the plurality of protrusions (4) are in a one-to-one correspondence with the plurality of barbs (3), and the circumferential projection position of each protrusion (4) is located at the middle of the top end of the corresponding barb (3).

5. The umbrella-shaped barb rivet according to claim 4, characterized in that: The diameter of the protrusion (4) is 0.1 mm.

6. The umbrella-shaped barb rivet according to claim 1, characterized in that: The length of the rivet rod (2) is 20 mm, and the diameter of the rivet rod (2) is 3 mm.

7. The umbrella-shaped barb rivet according to claim 1, characterized in that: The length of the nail head is 4.5 mm, and the cone angle of the nail head is 18°.

8. The umbrella-shaped barb rivet according to claim 1, characterized in that: The arc length of the top spacing between two adjacent barbs (3) is 1.6 mm, the arc length of the bottom spacing between two adjacent barbs (3) is 0.6 mm, and the inclination angle of each barb (3) is 30°.

9. The umbrella-shaped barb rivet according to claim 1, characterized in that: The outer surfaces of the rivet cap (1), the rivet rod (2) and the barb (3) are all provided with an electrophoretic coating layer.

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