Tree-shaped rivet

Abstract

The tree-shaped rivet comprises a rivet head, a rivet body arranged below the rivet head, a plurality of inverted buckles arranged on the rivet body and a plug arranged below the rivet body, the rivet body is arranged in a cross-shaped column shape, the cross-shaped column is composed of four straight columns, the inverted buckles and the rivet head are arranged at intervals, and the plug is arranged below the rivet head. The inverted buckles are evenly arranged on the two sides of the straight columns on the rivet body in a staggered mode, the other straight columns serve as interruption intervals, and the inverted buckles arranged on the two sides of one straight column are symmetrically arranged on the opposite straight columns with the center of the rivet body as the circle center. The number of the two inverted buckles arranged on the straight column is the same, the inverted buckles are arranged in parallel, and the ends, close to the center of the rivet body, of the inverted buckles incline towards the direction of the plug or are arranged perpendicular to the rivet body. According to the tree-shaped rivet, the inverted buckles of different structures are arranged, so that the balance of mounting and dismounting convenience can be maintained by the tree-shaped rivet.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fir fastener, especially a tree rivet. BACKGROUND

[0002] The tree rivet belongs to the fir fastener, also known as the Christmas tree fastener. The fir fastener is named because of its shape similar to the branches of the fir tree. The tree rivet is usually used for connecting metal plates and has a wide application in the aerospace, automobile and other industries. Its feature is that the "branch" part of the rivet can firmly fix multiple materials together by forming a kind of trapped reverse buckle structure in the material. The reverse buckle of the tree rivet can be effectively clamped on the metal surface, thereby providing a strong fixing effect. Compared with the traditional flat head rivet, the fir rivet can usually provide stronger bearing capacity and does not need additional fasteners during installation.

[0003] The current rivet installation process needs to install the rivet on the rivet machine, and then use the rivet machine to expand and clamp the rivet in the plate, thereby playing a fixed connection role. However, such rivet installation is not only inconvenient to operate, but also low in work efficiency. When the rivet needs to be disassembled, it is also difficult to pull out the rivet. SUMMARY

[0004] Therefore, the utility model provides a tree rivet to solve the above problems.

[0005] A tree rivet comprises a rivet head, a rivet body arranged below the rivet head, a plurality of reverse buckles arranged on the rivet body, and a plug arranged below the rivet body. The rivet body is arranged in a cross column shape, and the cross column is composed of four one-column ends connected perpendicularly to each other. The plurality of reverse buckles are arranged at intervals from the rivet head. The single reverse buckle is arranged at intervals on the rivet body, or the plurality of reverse buckles are uniformly and staggered arranged on both sides of the two one columns on the rivet body. The other two one columns are taken as the interrupt intervals, and the reverse buckles arranged on both sides of the one column are symmetrically arranged on the opposite one columns with the center of the rivet body as the center. The number of the reverse buckles arranged on both sides of the one column is the same and arranged in parallel to each other. The end of the reverse buckle close to the center of the rivet body is inclined to the direction of the plug or arranged perpendicularly to the rivet body.

[0006] Further, a round corner connection is arranged at the connection between the reverse buckle and the rivet body.

[0007] Further, the rivet head is arranged in an oval head or a flat head.

[0008] Further, the connection between the plug and the rivet body is provided with a mounting gap, the two opposite I-shaped columns in the rivet body extend to the middle section of the plug and are mounted in the mounting gap, the width of the two I-shaped columns extending to the plug is greater than or equal to the diameter of the plug.

[0009] Further, the connection between the plug and the rivet body is provided with a mounting gap, the two opposite I-shaped columns in the rivet body extend to the middle section of the plug and are mounted in the mounting gap, the width of the two I-shaped columns extending to the plug is greater than or equal to the diameter of the plug.

[0010] Further, the rivet head is provided in a round head or flat head, and the center of the rivet head provided in a round head protrudes away from the rivet body.

[0011] Further, the connection between the plug and the rivet body is provided with a mounting gap, the two opposite I-shaped columns in the rivet body extend to the middle section of the plug and are mounted in the mounting gap, the width of the two I-shaped columns extending to the plug is greater than or equal to the diameter of the plug.

[0012] Further, the outer side wall of a single reverse buckle wraps around the rivet body, or the surface of the reverse buckle is flush with the rivet body.

[0013] Further, in the plane perpendicular to the extension direction of the rivet body, the cross-sectional shape of the reverse buckle is a four-side chamfered rectangle, on the end face of the side of the reverse buckle away from the plug, the plane of the reverse buckle is perpendicular to the rivet body, on the end face of the side of the reverse buckle towards the plug, the thickness of the reverse buckle decreases in turn from the center of the rivet body to the outside, the plane of the side of the reverse buckle towards the plug is inclined away from the plug, and the cross-sectional shape of the reverse buckle in this direction is a reverse trapezoid with two sides extending.

[0014] Further, a circular rib is provided on the rivet body, and a plurality of circular ribs are provided on the initial section, the middle section and the terminal end of the reverse buckle provided on the rivet body, the circular rib is arranged on one I-shaped column and has the same extension direction as the reverse buckle.

[0015] Further, the extension corner of the reverse buckle is provided in a circular arc shape, and in the plane perpendicular to the extension direction of the rivet body, the cross-sectional shape of the reverse buckle is a chamfered rectangle.

[0016] Further, the reverse buckle is composed of four small reverse buckles, and the center of each small reverse buckle is provided with a fulcrum towards the rivet head on the curved surface towards the plug.

[0017] Further, the plug is provided in a conical or round head shape, and the tail end is flat.

[0018] Compared with the prior art, the tree-shaped rivet provided by the utility model is provided with multiple layers of reverse buckling to simulate a cedar shape, so that the rivet is conveniently inserted into the installation hole and the structural strength is increased. The reverse bucklings on the tree-shaped rivet in embodiment one are evenly and staggeredly arranged on the two sides of the character column on the rivet body, so that the reverse bucklings can uniformly distribute loads, the reverse bucklings are prevented from loosening under vibration or impact load by increasing friction and locking effect, and the reliability of the connection of the reverse bucklings is improved. In embodiment two, the tree-shaped rivet is continuously wrapped on the outside of the rivet body, the stress area of a single reverse buckling is increased, and the resistance received by the reverse buckling during installation can be dispersed into the rivet body, so as to enhance the structural strength of the reverse buckling. The thickness of the reverse buckling gradually decreases in the direction from the center of the rivet body to the outside, since the direction of the inclination of the reverse buckling is inclined towards the installation direction, the resistance received during installation is reduced, and the introduction ability of the reverse buckling during riveting is strengthened. However, the inclination angle of the reverse buckling is smaller than that in embodiment one, although the resistance received during installation is increased, the pulling force required during plugging is reduced, and the balance between installation and disassembly convenience is achieved. In embodiment three, the tree-shaped rivet is provided with the reverse buckling. The surface of the rivet body is flush with that of the reverse buckling. Compared with the reverse buckling in embodiment two, the resistance received by the reverse buckling during installation is more concentrated and dispersed into the rivet body, and the outside wall of the rivet body wrapped by the reverse buckling is prevented from being broken due to deformation. The corner of the extension of the reverse buckling is provided in a circular arc shape, so that the friction of the reverse buckling to the inside wall of the insertion hole is reduced, the force required during disassembly is reduced, and the disassembly is more labor-saving. The reverse buckling is provided with a fulcrum formed by two triangular extension lines and opposite diagonal lines of the chamfered rectangle, the fulcrum is arranged towards the rivet head, the curved surface outside the fulcrum is arranged towards the plug, the reverse buckling is increased in deformation resistance, since the inclination direction of the curvature of the curved surface with the fulcrum is the same as the deformation force direction of the reverse buckling during pulling out of the rivet body, the deformation force required during pulling out is reduced, and the disassembly convenience is increased. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 The structural schematic view of the tree-shaped rivet provided for embodiment one.

[0020] Fig. 2 The structural schematic view of the tree-shaped rivet provided for embodiment one from another perspective.

[0021] Fig. 3 The structural schematic view of the tree-shaped rivet provided for embodiment two.

[0022] Fig. 4 The structural schematic view of the tree-shaped rivet provided for embodiment two from another perspective.

[0023] Fig. 5 Structure diagram of a tree rivet provided for Embodiment Three.

[0024] Fig. 6 Structure diagram of another view of a tree rivet provided for Embodiment Three. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model will be further described below. It should be understood that the description of the embodiments of the utility model herein is not intended to limit the protection scope of the utility model.

[0026] The terms used herein are intended to explain the embodiments and are not intended to limit and / or define the utility model. It should be understood that the terms "front", "back", "left", "right", "up", "down" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only intended to facilitate the description of the utility model and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0027] Please refer to Figs. 1-2 , which is a structure diagram of a tree rivet provided for Embodiment One. The tree rivet comprises a rivet head 10, a rivet body 20 arranged below the rivet head 10, a plurality of reverse buckles 30 arranged on the rivet body 20, and a plug 40 arranged below the rivet body 20.

[0028] The rivet head 10 is round and the center of the rivet head 10 is convex in the direction away from the rivet body 20. The round head can better disperse the force, and the convex center can protect the rivet head 10 from being damaged due to deformation when pressed.

[0029] The rivet body 20 is arranged in the shape of a cross-shaped column, and the cross-shaped column is composed of the mutual perpendicular connection of one end of four one-shaped columns 21. The rivet body 20 is used to accommodate various functional components and is clamped in a fixed object.

[0030] A plurality of said reverse buckles 30 are arranged at intervals with said rivet head 10. A plurality of said reverse buckles 30 are arranged uniformly and staggered on both sides of said two said linear columns 21 on said rivet body 20, with the other two said linear columns 21 as the interrupt interval, wherein the reverse buckles 30 arranged on both sides of one said linear column 21 are arranged symmetrically on the other said linear column 21 with the center of said rivet body 20 as the center. The staggered arrangement of said reverse buckles 30 can uniformly distribute the load, increase the friction and locking effect, and prevent the loosening of said reverse buckles 30 under vibration or impact load. The number of said reverse buckles 30 arranged on both sides of said linear column 21 is the same and parallel to each other. The end of said reverse buckle 30 close to the center of said rivet body 20 is arranged obliquely towards the direction of said plug 40. Since the oblique direction of said reverse buckle 30 is inclined towards the installation direction, the resistance of said reverse buckle 30 during installation is reduced, thereby making the operation of said reverse buckle 30 more labor-saving. After insertion, the outer end of said reverse buckle 30 is inclined against the inner side wall of the insertion hole, increasing the connection strength with the hole. When pulling out, said reverse buckle 30 is deformed and embedded in the inner side wall of the insertion hole, generating a strong mechanical grip, and additional power needs to be applied to pull out said reverse buckle 30 from the inner side wall of the insertion hole. The connection between said reverse buckle 30 and said rivet body 20 is provided with a round corner, thereby increasing the anti-deformation ability of the connection of said reverse buckle 30, preventing the connection between said reverse buckle 30 and said rivet body 20 from being broken due to deformation when pulling out.

[0031] Said plug 40 is conical, with the tail flatly arranged. The tail end diameter of said plug 40 is smaller than the diameter of the required riveting hole, so as to facilitate the introduction and determine the position of said plug 40 arranged in the riveting object.

[0032] Example Two

[0033] This example is an improvement based on Example One, and some parts disclosed in Example One will not be repeated. The content disclosed in Example One also belongs to the content disclosed in Example Two.

[0034] Reference Figs. 3-4 , which is a structural schematic diagram of a tree-shaped rivet of Example Two. Compared with Example One, the difference between Example Two and Example One is:

[0035] The connection between said plug 40 and said rivet body 20 is provided with two oppositely arranged installation notches, and the opposite two said linear columns 21 in said rivet body 20 extend to the middle segment of said plug 40 and are located in said installation notches. The width of the two said linear columns 21 extending to said plug 40 is greater than the diameter of said plug 40. By increasing the contact area of said linear column 21 with the riveting object during installation, the perforation strength of said plug 40 on the riveting object requiring perforation during installation is increased, making the installation more labor-saving.

[0036] A plurality of said reverse buckles 30 are arranged on said rivet body 20, the outer wall thereof wraps said rivet body 20, and is arranged perpendicular to the central axis of said rivet body 20. Compared with the reverse buckles 30 in Embodiment One, the force bearing area of a single said reverse buckle 30 is increased, and the resistance that said reverse buckle 30 bears during installation can be dispersed into said rivet body 20, thereby enhancing the structural strength of said reverse buckle 30 and preventing said reverse buckle 30 from breaking during disassembly. In a plane perpendicular to the extension direction of said rivet body 20, the cross-sectional shape of said reverse buckle 30 is a four-side chamfered rectangle. On the end face of said reverse buckle 30 away from said plug 40, the plane of said reverse buckle 30 is perpendicular to said rivet body 20. On the end face of said reverse buckle 30 toward said plug 40, the thickness of said reverse buckle 30 gradually decreases from the center of said rivet body 20 outward, so that the plane of said reverse buckle 30 toward said plug 40 is inclined toward the direction away from said plug 40, and the cross-sectional shape of said reverse buckle 30 in this direction is a two-side extended inverted trapezoid. Since the inclination direction of said reverse buckle 30 is inclined toward the installation direction, the resistance during installation is reduced, and the insertion ability of said reverse buckle 30 during riveting is enhanced. However, the inclination angle of said reverse buckle 30 is smaller than that of said reverse buckle 30 in Embodiment One, although the resistance during installation is increased, the pulling force required during plugging and unplugging is reduced, thereby achieving a balance between the convenience of installation and disassembly. Since the required plugging and unplugging force is reduced, the connection between said reverse buckle 30 and said rivet body 20 is not provided with a round corner.

[0037] Said circular ribs 50 are arranged on said rivet body 20. A plurality of said circular ribs 50 are arranged on the initial segment, middle segment and terminal end of said reverse buckle 30 arranged on said rivet body 20. Said circular ribs 50 are arranged on one said straight column 21 in the same extension direction as said reverse buckle 30.

[0038] Embodiment Three

[0039] This embodiment is an improvement based on Embodiment Two, and the parts disclosed in Embodiment Two will not be repeated. The content disclosed in Embodiment Two also belongs to the content disclosed in Embodiment Three.

[0040] Reference Figs. 5-6 , which is a structural schematic diagram of a tree-shaped rivet according to Embodiment Three. Compared with Embodiment Two, Embodiment Three is different in that:

[0041] Said rivet head 10 is arranged as a flat head.

[0042] The rivet body 20 is flush with the surface of the undercut 30. Compared with the undercut 30 in embodiment two, the undercut 30 increases the resistance that the undercut 30 receives during installation and disperses the resistance into the rivet body 20, preventing the undercut 30 from wrapping the outer sidewall of the rivet body 20 from breaking due to deformation. The width of the two linear columns 21 on the rivet body 20 extending to the plug 40 is equal to the diameter of the plug 40.

[0043] The extended corners of the undercut 30 are arc-shaped, and the cross-sectional shape of the undercut 30 in a plane perpendicular to the extension direction of the rivet body 20 is a rounded rectangle, reducing the friction of the undercut 30 on the inner sidewall of the insertion hole, thereby reducing the force required during disassembly, and further making disassembly more labor-saving. The undercut 30 is composed of four small undercuts, and a fulcrum 31 toward the rivet head 10 is arranged at the center of the curved surface on the side facing the plug 40. Since the inclination direction of the curvature of the curved surface with the fulcrum 31 is the same as the deformation force direction of the undercut 30 during pulling out the rivet body 20, the deformation force required during pulling out is reduced, and the convenience of disassembly is increased.

[0044] The plug 40 is round-shaped, and the tail end is flat, which is used to enhance the structural strength.

[0045] Compared with the prior art, the tree-shaped rivet provided by the utility model is simulated by setting multiple undercuts 30 in a cedar shape, which facilitates the insertion of the rivet into the installation hole and also increases the structural strength. The undercuts 30 on the tree-shaped rivet in embodiment one are evenly and staggered arranged on both sides of the linear column 21 on the rivet body 20, so that the undercuts 30 can evenly distribute the load, prevent the undercut 30 from loosening under vibration or impact load by increasing the friction and locking effect, and improve the reliability of the connection of the undercut 30.

[0046] In embodiment two, the tree-shaped rivet is continuously wrapped on the outer side of the rivet body 20, increasing the stress area of a single undercut 30 and dispersing the resistance that the undercut 30 receives during installation into the rivet body 20, which is used to enhance the structural strength of the undercut 30. The thickness of the undercut 30 gradually decreases from the center of the rivet body 20 outward in the direction toward the plug 40 on the side of the undercut 30, and since the inclination direction of the undercut 30 is inclined toward the installation direction, the resistance during installation is reduced, and the lead-in ability of the undercut 30 during riveting is strengthened. However, the inclination angle of the undercut 30 is smaller than that in embodiment one, which increases the resistance during installation but reduces the pulling force required during insertion and extraction, achieving a balance between installation and disassembly convenience.

[0047] In Embodiment 3, the tree-shaped rivet is equipped with the undercut 30. The rivet body 20 is flush with the surface of the undercut 30. Compared to Embodiment 2, the undercut 30 increases the resistance encountered by the undercut 30 during installation, distributing it more concentratedly within the rivet body 20, preventing the outer wall of the undercut 30 covering the rivet body 20 from breaking due to deformation. The extended corners of the undercut 30 are rounded, reducing the friction between the undercut 30 and the inner wall of the insertion hole, thereby reducing the force required for disassembly and making disassembly easier. By providing a fulcrum 31 on the surface of the buckle 30, formed by two extended triangular lines and the diagonal of the chamfered rectangle, with the fulcrum 31 positioned toward the rivet head 10, and the curved surface extending outward from the fulcrum 31 toward the plug 40, the buckle 30 is designed to increase its resistance to deformation. Since the direction of the curvature of the curved surface with the fulcrum 31 is the same as the direction of the deformation force of the buckle 30 when the rivet body 20 is pulled out, the deformation force required for pulling out is reduced, and the ease of disassembly is increased.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A tree-shaped rivet, characterized in that: The tree-shaped rivet includes a rivet head, a rivet body located below the rivet head, multiple buckles on the rivet body, and a plug located below the rivet body. The rivet body is arranged in a cross-shaped column, which is composed of four straight posts connected perpendicularly to each other at one end. The multiple buckles are spaced apart from the rivet head. The multiple buckles are spaced apart on the rivet body, or are evenly and staggered on both sides of two straight posts on the rivet body, with two other straight posts as interruptions. The buckles located on both sides of one straight post are symmetrically arranged on the opposite straight post with the center of the rivet body as the center. The number of buckles on both sides of the straight post is the same and they are arranged parallel to each other. The end of the buckle closest to the center of the rivet body is inclined towards the plug or perpendicular to the rivet body.

2. The tree-shaped rivet as described in claim 1, characterized in that: The buckle is connected to the rivet body with a rounded corner.

3. The tree-shaped rivet as described in claim 1, characterized in that: The rivet head is either round or flat, and the center of the round rivet head protrudes away from the rivet body.

4. The tree-shaped rivet as described in claim 1, characterized in that: The connection between the plug and the rivet body is provided with two mounting notches. The two opposing pins in the rivet body extend to the middle section of the plug and are located in the mounting notches. The width of the two pins extending to the plug is greater than or equal to the diameter of the plug.

5. The tree-shaped rivet as described in claim 1, characterized in that: The outer wall of a single buckle is provided to wrap around the rivet body, or the rivet body is flush with the surface of the buckle.

6. The tree-shaped rivet as described in claim 1, characterized in that: On a plane perpendicular to the extension direction of the rivet body, the cross-sectional shape of the undercut is a rectangle with chamfered corners on all four sides. On the end face of the undercut away from the plug, the plane of the undercut is perpendicular to the rivet body. On the end face of the undercut facing the plug, the thickness of the undercut decreases sequentially from the center of the rivet body outward. The plane of the undercut facing the plug is inclined in a direction away from the plug, and the cross-sectional shape of the undercut in this direction is an inverted trapezoid with two sides extending outward.

7. The tree-shaped rivet as described in claim 1, characterized in that: A circular rib is provided on the rivet body, and multiple circular ribs are respectively provided on the starting section, middle section and end section of the rivet body where the undercut is provided. The circular ribs extend in the same direction as the undercut and are provided on a single post.

8. The tree-shaped rivet as described in claim 1, characterized in that: The extended corners of the buckle are rounded, and the cross-sectional shape of the buckle is a rounded rectangle on a plane perpendicular to the extension direction of the rivet body.

9. The tree-shaped rivet as described in claim 1, characterized in that: The buckle consists of four small buckles, and on the curved surface facing the plug, each small buckle has a fulcrum at its center facing the rivet head.

10. The tree-shaped rivet as described in claim 1, characterized in that: The plug is tapered or rounded, with a flat end.

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