Twist-off type anti-theft bolt and nut

Abstract

The utility model relates to the technical field of anti-theft bolts and nuts, and provides a twist-off type anti-theft bolt and nut, which comprises a nut with a sliding surface; the connecting cap is arranged on the nut and used for driving the nut to rotate; and the bolt is arranged in the nut, and after the bolt is connected with the nut, the connecting cap is separated from the nut body. According to the technical scheme, the problem that the anti-theft nut in the prior art does not change the characteristic that the outer edge of the polygonal nut has the clamping plane capable of applying torque, and the anti-theft effect is not ideal is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-theft bolts and nuts, and specifically relates to a twist-off type anti-theft bolt and nut. Background Art

[0002] Conventional nuts do not have an anti-theft function, but in some special use occasions, such as power transmission towers of power systems, communication systems, and field facilities such as highways, in order to prevent damage by lawless elements, fastening nuts are required to have an anti-theft function. There are various anti-theft methods in the prior art, for example, designing nuts to be special nuts that can only be turned by special tools, or installing anti-theft pins in nuts.

[0003] The anti-theft nuts in the prior art do not change the characteristic that the outer edge of the polygonal nut has a clamping plane that can apply torque, and the anti-theft effect is not ideal. Utility Model Content

[0004] The utility model provides a twist-off anti-theft bolt and nut, which solves the problem that the anti-theft nuts in the related art do not change the characteristic that the outer edge of the polygonal nut has a clamping plane that can apply torque, and the anti-theft effect is not ideal.

[0005] The technical solution of the utility model is as follows:

[0006] A twist-off anti-theft bolt and nut, comprising:

[0007] A nut having a smooth outer surface and a tapered end;

[0008] A connecting cap, arranged on the small diameter of the tapered end, for driving the nut to rotate;

[0009] A bolt is arranged in the nut. After the bolt is connected with the nut, the connecting cap is separated from the nut body.

[0010] Preferably, the nut comprises:

[0011] A main body, wherein the sliding surface is located on an outer surface of the main body, and the main body has a receiving groove;

[0012] The first internal thread portion is disposed in the receiving groove and is threadedly connected to the bolt.

[0013] Preferably, the bottom surface of the nut has a plurality of mounting holes, and further comprises:

[0014] An extension piece, disposed at the bottom of the main body, and used to be sleeved on the bolt;

[0015] There are a plurality of mounting rods, one end of which is arranged on the extension piece, and the other end of which is arranged in the mounting hole.

[0016] Preferably, the main body further has a slot, and the extension piece comprises:

[0017] A cylinder having a second internal threaded portion, wherein the inner diameter of the cylinder is the same as the inner diameter of the receiving groove, and the first internal threaded portion is the same as the second internal threaded portion;

[0018] The insert block is arranged on the cylinder body, and the insert block is arranged in the slot.

[0019] Preferably, the insert block has a third internal threaded portion, and the third internal threaded portion is the same as the first internal threaded portion. After the insert block is inserted into the slot, the third internal threaded portion fits with the first internal threaded portion.

[0020] Preferably, the mounting rod has an annular groove and further comprises:

[0021] An annular protrusion is arranged in the mounting hole. After the mounting rod is inserted into the mounting hole, the annular protrusion is clamped in the annular groove.

[0022] Preferably, the connecting cap comprises:

[0023] The fixed part is polygonal;

[0024] The connecting plate is annular in shape, the top surface of the connecting plate is fixedly arranged on the fixing part, and the bottom of the connecting plate is arranged on the main body.

[0025] Preferably, the main body is in a truncated cone shape.

[0026] Preferably, the bolt has an external threaded portion, and the external threaded portion is threadedly connected to the first internal threaded portion, the second internal threaded portion, and the third internal threaded portion.

[0027] Preferably, the outer surface of the cylinder is a smooth surface.

[0028] The working principle and beneficial effects of the utility model are:

[0029] In the utility model, the bolt is inserted into the nut body, and then the nut body is tightened to a predetermined torque through the connecting cap using a conventional tool. After the nut is installed in place, the connecting cap is continued to be twisted until the connecting cap and the nut are twisted off, leaving only the sliding nut fixed on the bolt. The twist-off anti-theft bolt and nut system of this embodiment, through the above structural design, significantly improves the anti-theft performance of fasteners in field facilities, and provides reliable protection for the safety protection of important infrastructure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0031] Figure 1 This is a schematic diagram of the anti-theft bolt and nut connection structure of the utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the nut of the utility model from the first perspective;

[0033] Figure 3 This is a schematic structural diagram of the nut of the utility model from a second viewing angle;

[0034] Figure 4 This is a schematic diagram of the structure of the extension piece of the utility model;

[0035] Figure 5 This is a schematic structural diagram of a second connection method of the anti-theft bolt and nut of the utility model.

[0036] In the figure: 1. nut; 101. main body; 103. first internal threaded portion; 104. slot; 105. mounting hole; 106. accommodating groove; 2. connecting cap; 201. fixing portion; 202. connecting plate; 3. bolt; 301. external threaded portion; 4. extension piece; 401. cylinder; 402. mounting rod; 4021. annular groove; 403. insert; 4031. third internal threaded portion; 404. second internal threaded portion. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0039] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] Reference Figure 1~Figure 5 , which is an embodiment of the utility model, proposes a twist-off anti-theft bolt and nut, including: a nut 1, the outer surface of which is a smooth surface and has a tapered end; a connecting cap 2, which is arranged on the small diameter of the tapered end and is used to drive the nut 1 to rotate; a bolt 3, which is arranged in the nut 1, and after the bolt 3 is connected to the nut 1, the connecting cap 2 is separated from the nut body 101.

[0042] The above scheme aims to solve the problem of unsatisfactory anti-theft effect in the prior art, especially the anti-theft demand for fasteners in field facilities such as power, communication and highways. By introducing the innovative structure of the sliding surface and the connecting cap 2, the anti-theft performance is effectively improved while maintaining the convenience of installation.

[0043] The specific structure is as follows: the main body 101 is made of high-strength steel, and a sliding surface is designed on the outer surface of the nut 1 instead of the clamping plane of the traditional nut 1. The introduction of the sliding surface makes it impossible for conventional wrenches or pliers to apply force effectively, thereby preventing illegal disassembly. The sliding surface is designed to be smooth and without edges, making any attempt to use general tools to rotate the body of the nut 1 difficult or even impossible. The connecting cap 2 is an independent component and is tightly connected to the nut 1 by welding. When the nut 1 is screwed together with the bolt 3, the connecting cap 2 can be used to drive the nut 1 to rotate together through the use of suitable conventional tools, so that the nut 1 can be easily connected and tightened with the bolt 3.

[0044] The outer edge of the connecting cap 2 is designed with a standard polygonal clamping surface, which is convenient for operation with conventional tools to ensure that the nut 1 body can be driven to be tightened on the bolt 3 during installation. When the nut 1 body and the bolt 3 are tightened, continue to twist the connecting cap 2 to break the connection between the connecting cap 2 and the nut 1 body, and then make the connecting cap 2 fall off relative to the nut 1 body, thereby achieving controllable fracture of the connection between the connecting cap 2 and the nut 1 body.

[0045] The bolt 3 is similar to the traditional bolt 3. Once the bolt 3 is connected to the nut 1, due to the breakage between the connecting cap 2 and the nut body 101, after the bolt 3 is fully tightened, a predetermined separation occurs between the connecting cap 2 and the nut 1, leaving only the sliding surface nut 1 that cannot be directly applied with force, thereby achieving the anti-theft purpose.

[0046] Operation process: During installation, first insert the bolt 3 into the body of the nut 1, and then use conventional tools to tighten the body of the nut 1 through the connecting cap 2 to the predetermined torque. At this time, the connecting cap 2 and the nut 1 are separated according to the design, leaving only the smooth surface nut 1 fixed on the bolt 3. During disassembly, the connecting cap 2 must be reconnected by welding, or the smooth surface nut 1 must be removed by destructive methods to ensure that only authorized personnel can perform maintenance or replacement, effectively preventing unauthorized disassembly. The twist-off anti-theft bolt 3 and nut 1 system of this embodiment, through the above-mentioned structural design, significantly improves the anti-theft performance of fasteners in field facilities, and provides reliable protection for the safety protection of important infrastructure.

[0047] Furthermore, the nut 1 includes: a main body 101 , a sliding surface is located on the outer surface of the main body 101 , and the main body 101 has a receiving groove 106 ; a first internal thread portion 103 is arranged in the receiving groove 106 , and the bolt 3 is threadedly connected to the first internal thread portion 103 .

[0048] In the above scheme, the nut 1 is made of high-strength material, and the outer surface of the main body 101 is designed with a slippery surface, which covers the clamping surface of the traditional nut 1, effectively preventing the direct action of unauthorized tools. The introduction of the slippery surface makes it impossible for conventional wrenches or pliers to find a suitable point of force, thereby achieving the purpose of anti-theft. Inside the main body 101, a receiving groove 106 is designed, and a first internal threaded portion 103 is arranged in the receiving groove 106. A tight and reliable threaded connection between the bolt 3 and the nut 1 is ensured. After the bolt 3 is inserted, the bolt 3 can be stably tightened by engaging with the first internal threaded portion 103. Through the above structural optimization, the twist-off anti-theft bolt 3 and nut 1 system of this embodiment not only improves the safety protection level, but also takes into account the convenience of installation and maintenance, ensuring that in field facilities such as electricity, communications and highways, fasteners can effectively prevent illegal disassembly, providing a strong guarantee for the safe operation of infrastructure.

[0049] Furthermore, the bottom surface of the nut 1 has a plurality of mounting holes 105, and also includes: an extension piece 4, which is arranged at the bottom of the main body 101, and the extension piece 4 is sleeved on the bolt 3; and a plurality of mounting rods 402, one end of the mounting rod 402 is arranged on the extension piece 4, and the other end is arranged in the mounting hole 105.

[0050] In the above scheme, the design of the nut 1 not only takes into account the anti-theft function, but also incorporates innovative elements that enhance structural stability and installation flexibility. The specific improvement lies in the additional mounting holes 105 on the bottom surface of the nut 1 and the matching extension 4 and mounting rod 402. The specific structure and function are described as follows: There are several evenly distributed mounting holes 105 designed on the bottom surface of the nut 1. The main purpose of these holes is to cooperate with the mounting rod 402 to increase the fixing reliability of the nut 1 in specific application scenarios, especially in those scenarios that require additional reinforcement or installation at a specific angle or position. The extension 4 is designed to be sleeved on the bolt 3, close to the bottom of the nut 1, and its function is to serve as a transition connector between the mounting rod 402 and the bolt 3. The extension 4 can be made of metal or high-strength plastic material, and the shape design matches the bolt 3 to ensure a tight fit, which not only enhances the connection stability between the bolt 3 and the nut 1, but also provides a stable base for the mounting rod 402. The mounting rod 402 is a structural member with one end fixed to the extension 4 and the other end inserted into the mounting hole 105 on the bottom surface of the nut 1. The length and diameter of each mounting rod 402 are designed according to actual application requirements to ensure that it can be firmly inserted into the mounting hole 105 and provide sufficient support or fixing when necessary. The number and layout of the mounting rods 402 can be flexibly adjusted according to actual needs, and can be one or more to meet different installation stability and force requirements.

[0051] During the installation process, the extension piece 4 is first sleeved on the bolt 3 close to the bottom of the nut 1, and then the mounting rod 402 is inserted into the corresponding mounting hole 105 on the bottom of the nut 1. The nut 1 and the bolt 3 are tightened, and the mounting rod 402 is fixed, which not only strengthens the stability of the entire connection structure, but also provides an additional anti-loosening measure for the nut 1, which is particularly suitable for application environments with large vibrations and complex stresses. Through this design, the twist-off anti-theft bolt 3 and nut 1 system of this embodiment not only maintains the original anti-theft characteristics, but also greatly enhances its installation stability and reliability in specific application environments, providing a more comprehensive solution for fastening connections under various complex working conditions.

[0052] Furthermore, the main body 101 also has a slot 104, and the extension piece 4 includes: a cylinder 401, having a second internal threaded portion, the inner diameter of the cylinder 401 is the same as the inner diameter of the accommodating groove 106, the first internal threaded portion 103 is the same as the second internal threaded portion; an insert block 403, which is arranged on the cylinder 401, and the insert block 403 is arranged in the slot 104.

[0053] In the above scheme, the slot 104 and the plug block 403 structure are introduced to enhance the assembly stability and operational convenience of the system. The bottom of the nut 1 is designed with a slot 104, and the position and size of these slots 104 are designed according to the shape of the plug block 403 of the extension piece 4 to ensure the precise match and firm connection between the two. The extension piece 4 includes two main parts: a cylinder 401 and a plug block 403. The cylinder 401 is designed with a second internal threaded portion, and its inner diameter is the same as the inner diameter of the receiving groove 106 inside the nut 1, ensuring that the bolt 3 can pass smoothly and achieve a tight threaded connection with the first internal threaded portion 103. This design forms a continuous and stable threaded connection channel between the nut 1 and the extension piece 4, enhancing the overall mechanical properties. The plug block 403 is fixed to the cylinder 401 of the extension piece 4, and its size and shape are precisely matched with the slot 104 on the main body 101. When the extension piece 4 is installed in place, the insert 403 is embedded in the slot 104 of the nut 1, which not only provides additional fixation to prevent rotation or falling off, but also increases the overall rigidity of the system to ensure the stability of the nut 1 in high vibration or impact environments. Through the above design, the stability, durability and seismic resistance of the system are significantly enhanced, and it is particularly suitable for those fields that have strict requirements on the safety, stability and installation convenience of fasteners, such as infrastructure construction such as electricity, communications and transportation.

[0054] Furthermore, the insert block 403 has a third internal thread portion 4031 , and the third internal thread portion 4031 is the same as the first internal thread portion 103 . After the insert block 403 is inserted into the slot 104 , the third internal thread portion 4031 fits with the first internal thread portion 103 .

[0055] In the above scheme, in addition to being a physical embedded component, the insert block 403 is also designed with a third internal threaded portion 4031, and the specifications of the third internal threaded portion 4031 are exactly the same as those of the first internal threaded portion 103. This means that when the insert block 403 is completely embedded in the slot 104 of the nut 1, the third internal threaded portion 4031 can continue to be threadedly engaged with the external thread on the bolt 3. Continuous engagement of threads: This design allows the bolt 3 to not only form a threaded connection with the first internal threaded portion 103 of the nut 1, but also to further form a continuous threaded fit with the third internal threaded portion 4031 in the insert block 403. Such a double-layer threaded connection not only enhances the firmness of the connection, but also can more evenly distribute the force on the bolt 3 during the tightening process, effectively preventing thread damage or loosening due to local stress concentration.

[0056] Furthermore, the mounting stem 402 has an annular groove 4021 , and also includes: an annular protrusion, which is arranged in the mounting hole 105 . After the mounting stem 402 is inserted into the mounting hole 105 , the annular protrusion is snap-fitted into the annular groove 4021 .

[0057] In the above scheme, an annular protrusion is designed on the inner wall of each mounting hole 105, which matches the annular groove 402 on the mounting rod 402. The presence of the annular protrusion not only provides a positioning and locking interface for the mounting rod 402, but also increases the stability of the structure, preventing the mounting rod 402 from unnecessary movement or falling off when subjected to external force. The annular protrusion is perfectly docked with the annular groove 4021 of the mounting rod 402. When the mounting rod 402 is inserted into the appropriate position of the mounting hole 105, the annular protrusion will be embedded in the corresponding annular groove 4021, forming a reliable mechanical locking structure to ensure that the mounting rod 402 is stable and does not fall off. Through the mutual cooperation between the annular groove 4021 and the annular protrusion, not only the connection strength between the mounting rod 402 and the nut 1 is enhanced, but also the anti-loosening ability of the entire fastening system is improved, especially for working environments that are subjected to dynamic loads or vibrations for a long time. Such a design can effectively prevent the loosening of screws caused by vibration and ensure the safe operation of the equipment.

[0058] Furthermore, the connecting cap 2 includes: a fixing portion 201 in a polygonal shape; a connecting plate 202 in a ring shape, wherein the top surface of the connecting plate 202 is fixedly disposed on the fixing portion, and the bottom of the connecting plate 202 is disposed on the main body 101 .

[0059] In the above scheme, the fixing part 201 is designed to be polygonal. The choice of this shape is intended to be compatible with common wrench tools, so that construction workers can use conventional tools to tighten the bolts 3. The top surface of the connecting plate 202 is fixed to the fixing part 201, ensuring the continuity and uniformity of torque transmission. Operation process: In actual operation, construction workers use the polygonal fixing part 201 and the common wrench to rotate the connecting cap 2, thereby driving the internal thread of the nut 1 to screw in. When the bolt 3 reaches the predetermined tightening state, the preset structure (such as the easy-break design) between the connecting cap 2 and the nut 1 comes into play to ensure that under certain conditions, the connecting cap 2 is separated from the main body 101, and the remaining nut 1 has a slippery surface, further enhancing the anti-theft effect.

[0060] Furthermore, the main body 101 is in a truncated cone shape.

[0061] In the above scheme, the frustum-conical design increases the difficulty of illegal disassembly to a certain extent, because the non-standard shape makes it more difficult to use common tools such as ordinary wrenches for illegal operation, further enhancing the anti-theft characteristics of the nut 1 system. In addition, the frustum-conical design has a certain degree of visual recognition and can be used as a clear mark of special-purpose or anti-theft nuts 1, which is convenient for rapid identification and distinction on site, and also has a positive effect on the correct operation guidance of maintenance personnel.

[0062] Furthermore, the bolt 3 has an external thread portion 301 , and the external thread portion 301 is threadedly connected with the first internal thread portion 103 , the second internal thread portion and the third internal thread portion 4031 .

[0063] Furthermore, the outer surface of the cylinder 401 is a smooth surface, which is similar to a slippery surface, and prevents the cylinder 401 from driving the main body 101 to rotate and be unscrewed.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A twist-off anti-theft bolt and nut, characterized in that: include: A nut (1) having a smooth outer surface and a tapered end; A connecting cap (2) is arranged at the small diameter of the tapered end and is used to drive the nut (1) to rotate; The bolt (3) is arranged in the nut (1); after the bolt (3) is connected to the nut (1), the connecting cap (2) is separated from the nut (1).

2. A twist-off anti-theft bolt and nut according to claim 1, characterized in that: The nut (1) comprises: A main body (101), the sliding surface is located on the outer surface of the main body (101), and the main body (101) has a receiving groove (106); A first internal thread portion (103) is disposed in the receiving groove (106), and the first internal thread portion (103) is used for threaded connection with the bolt (3).

3. A twist-off anti-theft bolt and nut according to claim 2, characterized in that: The bottom surface of the nut (1) is provided with a plurality of mounting holes (105), and further comprises: An extension piece (4) is arranged at the bottom of the main body (101), and the extension piece (4) is used to be sleeved on the bolt (3); There are a plurality of mounting rods (402), one end of each mounting rod (402) is disposed on the extension member (4), and the other end of each mounting rod (402) is disposed in the mounting hole (105).

4. A twist-off anti-theft bolt and nut according to claim 3, characterized in that: The main body (101) further has a slot (104), and the extension piece (4) comprises: A cylinder (401) having a second internal threaded portion, the inner diameter of the cylinder (401) being the same as the inner diameter of the receiving groove (106), and the first internal threaded portion (103) being the same as the second internal threaded portion; The insert block (403) is arranged on the cylinder (401), and the insert block (403) is arranged in the slot (104).

5. A twist-off anti-theft bolt and nut according to claim 4, characterized in that: The insert block (403) has a third internal thread portion (4031), and the third internal thread portion (4031) is the same as the first internal thread portion (103). After the insert block (403) is inserted into the slot (104), the third internal thread portion (4031) and the first internal thread portion (103) fit together.

6. A twist-off anti-theft bolt and nut according to claim 3, characterized in that: The mounting rod (402) has an annular groove (4021) and further comprises: An annular protrusion is arranged in the mounting hole (105); after the mounting rod (402) is inserted into the mounting hole (105), the annular protrusion is clamped in the annular groove (4021).

7. A twist-off anti-theft bolt and nut according to claim 2, characterized in that: The connecting cap (2) comprises: The fixing portion (201) is polygonal; The connecting plate (202) is annular in shape, the top surface of the connecting plate (202) is fixedly arranged on the fixing portion, and the bottom of the connecting plate (202) is arranged on the main body (101).

8. The twist-off anti-theft bolt and nut according to claim 2, characterized in that: The main body (101) is in a truncated cone shape.

9. The twist-off anti-theft bolt and nut according to claim 5, characterized in that: The bolt (3) has an external threaded portion (301), and the external threaded portion (301) is threadedly connected to the first internal threaded portion (103), the second internal threaded portion, and the third internal threaded portion (4031).

10. A twist-off anti-theft bolt and nut according to claim 4, characterized in that: The outer surface of the cylinder (401) is a smooth surface.

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