Metal fastener

Abstract

The utility model relates to the technical field of fasteners, and provides a metal fastener which comprises a first bolt and a second bolt arranged on the surface of the first bolt in a sleeved mode, and the second bolt is adjusted in a sliding mode in the length direction of the first bolt through a limiting mechanism arranged on the first bolt. The second screw rod is moved to move along the surface of the first screw rod, the second screw rod makes contact with the screw head, and therefore the drill bit extends out to make contact with the surface of an object, the screw head is screwed through a tool to drive the first screw rod and the drill bit to rotate, and the second screw rod is driven by the limiting mechanism to rotate along with the drill bit. And on the contrary, when an object with a preformed hole is connected, a second screw rod penetrates through the preformed hole, and meanwhile, a nut is screwed on the surface of the second screw rod to complete fixation, so that the effect of conveniently switching different connection modes according to different use scenes is achieved, and the practicability is high. And the application range and the use flexibility of the fastener are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a metal fastener. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening and connection and are extremely widely used. Fasteners are widely used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, and other industries. Various types of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments, and supplies. They are the most widely used mechanical basic parts. They are characterized by a wide variety of varieties and specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people call a type of fasteners with national standards standard fasteners, or simply standard parts.

[0003] The known authorized patent with application number: CN202222705184.4 discloses an assembled metal fastener. Its background technology raises the problem that "existing metal fasteners cannot meet the positioning requirements and need to be locked with tools". Therefore, the technical solution to this problem is "including metal fasteners and threads, characterized in that: an installable anti-slip sleeve is provided on the top of the metal fastener, and a positioning pin is provided under the thread of the metal fastener. There is an installable locking cover plate on the top of the metal fastener, which is connected to the metal fastener by threads; an anti-slip sleeve is provided between the metal fastener and the locking cover plate, and has an interference fit with the metal fastener, the anti-slip sleeve is made of rubber and the inner wall and the wall of the anti-slip sleeve are provided with textures, the length is 20-130mm, and the optimal length is 100m." etc.

[0004] However, in the implementation of relevant technologies, it was found that the above-mentioned technical solution has the following problems: although the effect of manual locking is achieved through the provided technical solution, it is not convenient to flexibly adjust it according to the usage scenario during use. The above-mentioned technical solution can only connect objects with reserved holes, and cannot perform self-tapping connections on objects without reserved holes (such as plates). The screws need to be replaced for connection, which is more troublesome and easily leads to a reduction in the scope of application and flexibility of use. Utility Model Content

[0005] The utility model provides a metal fastener, which solves the problem in the related art that it is inconvenient to flexibly adjust according to the usage scenario.

[0006] The technical solution of the utility model is as follows: a metal fastener, comprising: a bolt 1 and a bolt 2 sleeved on the surface of the bolt 1, wherein the bolt 2 is slidably adjusted along the length direction of the bolt 1 through a limiting mechanism provided on the bolt 1;

[0007] The bottom end of the bolt 1 is fixedly connected with a self-tapping piece.

[0008] The self-tapping part comprises a drill bit with a conical structure.

[0009] The drill bit is composed of a plurality of triangular pieces which are spliced ​​to each other.

[0010] The bolt 1 comprises a screw head and a screw rod 1 fixedly connected to the bottom of the screw head.

[0011] The bolt 2 comprises a screw rod 2 with a hollow structure inside, and a nut is threadedly connected to the surface of the screw rod 2.

[0012] Preferably, the limiting mechanism comprises limiting sliding grooves symmetrically arranged on both sides of the surface of the first screw rod and limiting sliding blocks fixedly connected to both sides of the inner wall of the second screw rod and sliding with the limiting sliding grooves.

[0013] Preferably, a chamfer is formed at the bottom end of the second screw, and the inclined surface of the chamfer extends outward along the axial direction of the second screw.

[0014] Preferably, the surfaces of the bolt one and the bolt two are coated with a protective coating.

[0015] The working principle and beneficial effects of the utility model are:

[0016] When connecting an object without a reserved hole, the second screw is moved along the surface of the first screw so that the second screw and the screw head are in contact, thereby making the drill bit extend out and contact the surface of the object, and the screw head is turned by a tool to drive the first screw and the drill bit to rotate, and the second screw is driven to rotate accordingly through the limiting mechanism, and then under the action of the drill bit, the purpose of self-tapping connection of the object without a reserved hole is achieved. Conversely, when connecting an object with a reserved hole, the second screw is passed through the reserved hole, and the first screw is moved to make the screw head and the second screw contact to expose the drill bit, and the nut is screwed on the surface of the second screw to complete the fixation, and then the drill bit is expanded and covered with the nut by a tool, which can prevent the nut from loosening. Therefore, it is convenient to switch different connection methods according to different usage scenarios, effectively improving the scope of application and flexibility of use of the fastener. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the screw rod 1 of the utility model;

[0020] Figure 3 It is a partial three-dimensional structural schematic diagram of a bolt 1 of the utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional three-dimensional structure of the screw rod 2 of the utility model;

[0022] In the figure: 1. screw head; 2. screw rod 1; 3. screw rod 2; 4. drill bit; 5. nut; 6. limit slide groove; 7. limit slider; 8. chamfer. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1

[0025] See also Figure 1 - Figure 4 The utility model provides a metal fastener, comprising: a bolt 1 and a bolt 2 sleeved on the surface of the bolt 1, wherein the bolt 2 is slidably adjusted along the length direction of the bolt 1 through a limiting mechanism provided on the bolt 1;

[0026] The bottom end of the bolt 1 is fixedly connected with a self-tapping piece.

[0027] The self-tapping part comprises a drill bit 4 with a conical structure.

[0028] The drill bit 4 is composed of a plurality of triangular pieces connected to each other.

[0029] The bolt 1 comprises a screw head 1 and a screw rod 2 fixedly connected to the bottom of the screw head 1.

[0030] The bolt 2 includes a screw rod 2 3 with a hollow structure inside, and a nut 5 is threadedly connected to the surface of the screw rod 2 3 .

[0031] The technical solution provided by this embodiment is as follows: when connecting objects without pre-set holes, the screw rod 2 3 is moved to move along the surface of the screw rod 1 2 via the limiting mechanism, and the top of the screw rod 2 3 is brought into contact with the bottom of the screw head 1, so that the drill bit 4 is extended, and then the drill bit 4 is brought into contact with the surface of the object, and at the same time, the screw head 1 is twisted with a tool to drive the screw rod 1 2 and the drill bit 4 to rotate, and the screw rod 2 3 is driven to rotate accordingly via the limiting mechanism, and then, under the action of the drill bit 4, the purpose of self-tapping connection of objects without pre-set holes is achieved, without the need to replace other fasteners. The drill bit 4 is then screwed onto the surface of the screw 3 to complete the fixation. The drill bit 4 is then unfolded with a tool to cover the nut 5, which can limit the nut 5 and prevent the nut 5 from loosening due to self-rotation caused by vibration. Therefore, it is easy to switch between different connection methods according to different usage scenarios, effectively improving the scope of application and flexibility of use of the fastener.

[0032] Furthermore, the limiting mechanism includes limiting grooves 6 symmetrically arranged on both sides of the surface of the screw rod 1 2 and limiting sliders 7 fixedly connected to both sides of the inner wall of the screw rod 2 3 and sliding with the limiting grooves 6 .

[0033] Specifically, when the objects are self-drilling connected, the screw rod 2 3 is moved upward and the limiting slider 7 is driven to slide upward in the limiting slide groove 6, so that the top of the screw rod 2 3 and the screw head 1 are in conflict with each other, and the drill bit 4 is exposed for self-drilling connection, and when the screw rod 1 2 is turned, the limiting slider 7 in the limiting slide groove 6 can drive the screw rod 2 3 to rotate and screw in along with the screw rod 1 2. Conversely, when connecting objects with reserved holes, the screw rod 2 3 can be directly passed through the reserved holes for connection.

[0034] Furthermore, a chamfer 8 is formed at the bottom end of the screw rod 2 3 , and the inclined surface of the chamfer 8 extends outwardly along the axial direction of the screw rod 2 3 .

[0035] Specifically, by providing the chamfer 8, when the screw 1 2 is self-drilling, it is convenient to drive the screw 2 3 to smoothly drill into the interior of the object and be fixed.

[0036] Embodiment 2

[0037] Based on Example 1, in this example: the surfaces of bolt 1 and bolt 2 are coated with a protective coating, wherein the protective coating includes a zinc coating coated on the surfaces of bolt 1 and bolt 2, and a polyurethane coating coated on the surface of the zinc coating.

[0038] The technical solution provided by this embodiment is: by providing a zinc coating, oxygen and water can be blocked from entering the surface of bolt one and bolt two, so as to provide effective anti-corrosion protection, thereby extending the service life of bolt one and bolt two. At the same time, the zinc coating can also increase the hardness of the surface of bolt one and bolt two, improve their wear resistance, and reduce surface wear caused by friction. By providing a polyurethane coating, additional chemical corrosion resistance can be provided for bolt one and bolt two, so as to resist the erosion of chemical substances such as acids and alkalis, and increase the durability of bolt one and bolt two in harsh environments.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal fastener, characterized in that: include: Bolt 1 and bolt 2 sleeved on the surface of bolt 1, wherein bolt 2 is slidably adjusted along the length direction of bolt 1 through a limiting mechanism arranged on bolt 1; The bottom end of the bolt 1 is fixedly connected with a self-tapping piece.

2. A metal fastener according to claim 1, characterized in that: The self-tapping part comprises a drill bit (4) with a conical structure.

3. A metal fastener according to claim 2, characterized in that: The drill bit (4) is composed of a plurality of triangular pieces spliced ​​together.

4. A metal fastener according to claim 1, characterized in that: The bolt 1 comprises a screw head (1) and a screw rod 1 (2) fixedly connected to the bottom of the screw head (1).

5. A metal fastener according to claim 4, characterized in that: The bolt 2 comprises a screw rod 2 (3) with a hollow structure inside, and a nut (5) is threadedly connected to the surface of the screw rod 2 (3).

6. A metal fastener according to claim 5, characterized in that: The limiting mechanism comprises limiting grooves (6) symmetrically arranged on both sides of the surface of the first screw (2) and limiting sliding blocks (7) fixedly connected to both sides of the inner wall of the second screw (3) and sliding with the limiting grooves (6).

7. A metal fastener according to claim 5, characterized in that: The bottom end of the second screw (3) is formed with a chamfer (8), and the inclined surface of the chamfer (8) extends outward along the axial direction of the second screw (3).

8. A metal fastener according to claim 1, characterized in that: The surfaces of the bolt 1 and the bolt 2 are both coated with a protective coating.

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