Twist-off type anti-theft nut

Abstract

The invention belongs to the technical field of nuts, and particularly relates to a twist-off type anti-theft nut which comprises a main body internally provided with internal threads and a wrenching part connected to one side of the main body in the axial direction, a connecting part is arranged between the wrenching part and the main body, a wrenching groove is formed in the connecting part, and the surface of the main body is an arc-shaped surface. The diameter of the section close to one end of the wrenching part is smaller than that of the section far away from one end of the wrenching part; the surface of the main body is arranged to be the arc-shaped surface, and the diameter size of the section of one end close to the wrenching part is smaller than that of the section of one end far away from the wrenching part, namely, the diameter size of the section is large inside and small outside, so that the clamping difficulty of tools such as pipe tongs is increased, the risk of being detached is effectively reduced, and the anti-theft effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nuts, and in particular relates to a twist-off anti-theft nut. Background Art

[0002] Anti-theft nuts are a type of fastener that uses a special structural design to significantly increase the difficulty of disassembly, thereby preventing unauthorized disassembly and playing an anti-theft role. They are usually used in conjunction with bolts and are applied in scenarios where the nut is located on the outside of the installation.

[0003] Traditional anti-theft nuts usually adopt a twist-off type. For example, the anti-theft nut is set into two parts, a locking part and a wrench part, and is connected by a connection part that is easy to twist off. The wrench part is driven to rotate by a tool, and then the locking part is driven to rotate through the connection part, thereby realizing the connection between the anti-theft nut and the adapter bolt. After the anti-theft nut is connected in place, continuing to apply force will cause the connection part to twist off, thereby causing the wrench part to separate from the locking part, and making it impossible to continue to disassemble it by applying conventional tools to the locking part, thereby achieving an anti-theft effect.

[0004] However, the locking surface of traditional anti-theft nuts usually adopts a flat structure. If the thief uses pipe clamps to clamp them hard or tools with strong clamping force such as hydraulic pipe clamps, there is still a high risk of disassembly. Summary of the Invention

[0005] The purpose of the present invention is to provide a twist-off anti-theft nut to address the above-mentioned technical problems, thereby increasing the clamping difficulty of tools such as pipe wrenches, reducing the risk of disassembly, and improving the anti-theft effect.

[0006] In view of this, the present invention provides a twist-off anti-theft nut, comprising: The main body has an internal thread; The wrench part is connected to one side of the main body in the axial direction, and a connecting part is provided between the main body and a twisting groove is provided in the connecting part; The surface of the main body is an arc-shaped surface, and the cross-sectional diameter size of the end close to the twisting portion is smaller than the cross-sectional diameter size of the end away from the twisting portion.

[0007] In the above technical solution, further: The main body includes a locking portion and a toggle portion sleeved on the locking portion; A rotation gap is formed between the locking portion and the toggle portion, the connecting portion is connected to the locking portion, and an internal thread is provided on the inner wall of the locking portion.

[0008] In the above technical solution, further: The cross-sectional diameter of the locking portion at one end close to the twisting portion is larger than the cross-sectional diameter of the locking portion at one end away from the twisting portion.

[0009] In the above technical solution, further: One end of the toggle portion away from the connecting portion extends toward one side of the main body axis to form an abutment portion; The abutting portion can restrict the rotation of the toggle portion after the locking portion is locked, and can release the restriction on the rotation of the toggle portion after the locking portion is loosened.

[0010] In the above technical solution, further: A lubricating gasket is provided between the abutting portion and the locking portion along the axial direction of the main body.

[0011] In the above technical solution, further: A first mounting hole is formed in the locking portion, and a locking member for limiting the rotation of the locking portion around the axis is mounted in the first mounting hole, and the locking member includes a locking tooth slidably connected to the first mounting hole and a trigger member mounted at an end of the locking portion away from the connecting portion, the trigger member being used to drive the locking tooth to protrude from the inner wall of the locking portion; The locking teeth are arranged corresponding to the tooth tips of the internal threads on the inner wall of the locking portion.

[0012] In the above technical solution, further: One end of the locking tooth close to the inner wall of the locking portion forms a tooth tip portion with a V-shaped cross section, and the normal direction of the V-shaped cross section of the tooth tip portion is arranged parallel to the radial surface of the locking portion.

[0013] In the above technical solution, further: An elastic layer is sleeved on one end of the locking tooth located at the tooth tip.

[0014] In the above technical solution, further: A sleeve is interference-fitted in the first mounting hole, and a limiting boss is formed on the inner wall of the sleeve, and the locking tooth is provided with a limiting recess adapted to the limiting boss; Wherein, an annular groove is provided on the surface of the locking tooth, and a sealing ring is sleeved on the annular groove.

[0015] In the above technical solution, further: The trigger member includes a push rod and a return spring, and a second mounting hole for mounting the push rod and the return spring is provided on the locking portion, and a guide inclined groove is provided on the push rod; Wherein, an end of the locking tooth away from the tooth tip is provided with a guide bevel portion adapted to the guide bevel groove.

[0016] The beneficial effects of the present invention are: 1. By setting the main body surface into an arc surface and setting the cross-sectional diameter size of the end close to the twisting part to be smaller than the cross-sectional diameter size of the end away from the twisting part, that is, setting the inside to be larger and the outside to be smaller, the clamping difficulty of tools such as pipe wrenches is increased, the risk of disassembly is effectively reduced, and the anti-theft effect is improved.

[0017] 2. By configuring the main body with a locking part and a toggle part, the difficulty of disassembling tools such as pipe wrenches is further prevented. Even if the pipe wrench can be clamped on the main body, the relative rotation between the toggle part and the locking part will prevent the force from being transmitted to the locking part, and thus the locking part cannot be disassembled, further reducing the risk of disassembly and ensuring the anti-theft effect.

[0018] 3. By making the cross-sectional diameter of the locking part close to the twisting part larger than the cross-sectional diameter of the end away from the twisting part, that is, the inner part is smaller and the outer part is larger, the locking part and the toggle part can be separately molded and manufactured without the need for advance assembly. When using, just put the toggle part on the bolt first, and then connect the locking part, which effectively improves the convenience of manufacturing and use, and can effectively limit the axial position of the toggle part through the locking part, thereby improving the installation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 This invention Figure 2 Enlarged view of point A in the middle; Figure 4 is an exploded view of the locking member of the present invention; The markings in the figure are as follows: 1. internal thread; 2. wrench portion; 3. connection portion; 4. unscrewing groove; 5. locking portion; 6. toggle portion; 7. rotational gap; 8. abutment portion; 9. lubrication gasket; 10. first mounting hole; 11. locking tooth; 12. tooth tip; 13. elastic layer; 14. sleeve; 15. limiting boss; 16. limiting recess; 17. annular groove; 18. sealing ring; 19. push rod; 20. reset spring; 21. second mounting hole; 22. guide bevel groove; 23. guide bevel wedge portion. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0021] Example 1: This embodiment provides a twist-off anti-theft nut, comprising: The main body has an internal thread 1; The wrench part 2 is connected to one side of the main body in the axial direction, and a connecting part 3 is provided between the main body and a twisting groove 4 is provided on the connecting part 3; The main body surface is an arc-shaped surface, and the cross-sectional diameter of the end close to the wrench portion 2 is smaller than the cross-sectional diameter of the end away from the wrench portion 2; At the same time, the anti-theft nut of the present application can be applied to specifications of M12-M24, and when the anti-theft nut adopts the M12 specification, it is allowed not to process the twist-off groove to meet the guaranteed load requirements; Furthermore, the wrench portion 2 may be provided with an external hexagonal structure or a round head structure and may have an internal hexagonal slot, a cross slot, or a slotted slot.

[0022] As can be seen from this embodiment, by setting the main body surface to be an arcuate surface and setting the cross-sectional diameter size of the end close to the wrench portion 2 to be smaller than the cross-sectional diameter size of the end away from the wrench portion 2, that is, setting the inside to be larger and the outside to be smaller, the clamping difficulty of tools such as pipe wrenches is increased, the risk of disassembly is effectively reduced, and the anti-theft effect is improved; The twist-off groove facilitates the control of the twist-off position on the one hand, and on the other hand can avoid the need for excessive loads due to excessive specifications and models, which increases the inconvenience of use.

[0023] Example 2: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The main body includes a locking portion 5 and a toggle portion 6 sleeved on the locking portion 5; A rotation gap 7 is formed between the locking portion 5 and the toggle portion 6, and the connecting portion 3 is connected to the locking portion 5, and the internal thread 1 is provided on the inner wall of the locking portion 5; At the same time, the rotation gap 7 can be 1-2 mm to avoid the intrusion of impurities due to an excessively large rotation gap 7, which may cause the rotation between the toggle portion 6 and the locking portion 5 to become stuck. Furthermore, the connecting portion 3 , the locking portion 5 and the wrench portion 2 may be formed as an integrated structure.

[0024] It can be seen from this embodiment that by configuring the main body into a locking portion 5 and a toggle portion 6, the difficulty in disassembling tools such as pipe wrenches is further prevented. Even if the pipe wrenches can be clamped on the main body, the relative rotation between the toggle portion 6 and the locking portion 5 will prevent the force from being transmitted to the locking portion 5, and thus the locking portion 5 cannot be disassembled, further reducing the risk of disassembly and ensuring the anti-theft effect.

[0025] Example 3: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The cross-sectional diameter of the locking portion 5 at one end close to the twisting portion 2 is larger than the cross-sectional diameter of the locking portion 5 at one end away from the twisting portion 2 .

[0026] It can be seen from the present embodiment that by making the cross-sectional diameter of the locking portion 5 close to the twisting portion 2 larger than the cross-sectional diameter of the end away from the twisting portion 2, that is, the inner portion is smaller and the outer portion is larger, the locking portion 5 and the toggle portion 6 can be separately molded and manufactured without the need for prior assembly. When in use, the toggle portion 6 only needs to be put on the bolt first, and then the locking portion 5 can be connected, which effectively improves the convenience of manufacturing and use, and can effectively limit the axial position of the toggle portion 6 through the locking portion 5, thereby improving the installation stability.

[0027] Example 4: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: One end of the toggle portion 6 away from the connecting portion 3 extends toward the main body axis to form an abutment portion 8; The abutting portion 8 can restrict the rotation of the toggle portion 6 after the locking portion 5 is locked, and can release the restriction on the rotation of the toggle portion 6 after the locking portion 5 is loosened; At the same time, the abutting portion 8 and the shifting portion 6 adopt an integrated structure.

[0028] It can be seen from the present embodiment that, through the setting of the abutment portion 8, the rotation of the toggle portion 6 can be restricted after the anti-theft screw is tightened. Therefore, such a setting can facilitate the inspection personnel to conveniently understand the fastening status of the anti-theft nut by toggling the abutment portion 8. After the toggle portion 6 becomes loose, it can be replaced or remedied in time, thereby effectively improving the installation stability of the outdoor device.

[0029] Example 5: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A lubricating gasket 9 is provided between the abutting portion 8 and the locking portion 5 along the axial direction of the main body; The lubricating gasket 9 can be made of polytetrafluoroethylene.

[0030] It can be seen from this embodiment that by setting the lubricating gasket 9, when the toggle part 6 rotates, the driving of the abutting part 8 is effectively reduced, thereby ensuring the stability of the abutting part 8, and further ensuring that even if the toggle part 6 can be clamped, it cannot cause rotational influence on the abutting part 8, further ensuring the anti-theft effect.

[0031] Example 6: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A first mounting hole 10 is defined in the locking portion 5, and a locking member is mounted in the first mounting hole 10 for limiting the rotation of the locking portion 5 around the axis. The locking member includes a locking tooth 11 slidably connected to the first mounting hole 10 and a trigger member mounted at an end of the locking portion 5 away from the connecting portion 3. The trigger member is used to drive the locking tooth 11 to protrude from the inner wall of the locking portion 5. The locking teeth 11 are arranged corresponding to the tooth tips of the internal thread 1 on the inner wall of the locking portion 5 .

[0032] As can be seen from this embodiment, after the locking portion 5 is installed, the trigger member drives the locking teeth 11 to be embedded in the external thread of the bolt. Since the external thread of the bolt is a spiral structure, the locking teeth 11 can be restricted from rotating around the axis after being embedded, thereby effectively improving the connection strength and stability between the locking portion 5 and the bolt, further improving the anti-theft effect, and improving the installation stability of the locking portion 5 and extending the service life. The locking teeth 11 are arranged corresponding to the tooth tips of the internal thread 1 on the inner wall of the locking part 5, so that the locking teeth 11 are conveniently aligned with the tooth valleys of the external thread of the bolt, thereby ensuring that the locking teeth 11 are embedded in the external thread of the bolt.

[0033] Example 7: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: One end of the locking tooth 11 close to the inner wall of the locking portion 5 forms a tooth tip portion 12 with a V-shaped cross section, and the normal direction of the V-shaped cross section of the tooth tip portion 12 is arranged parallel to the radial surface of the locking portion 5.

[0034] It can be seen from this embodiment that by forming a tooth tip portion 12 with a V-shaped cross-section on the locking tooth 11, it is convenient for the locking tooth 11 to be embedded in the external thread of the bolt, that is, before the locking part 5 is installed in place, the tooth tip portion 12 can be gradually embedded in the external thread of the bolt, and will not cause too much influence on the thread fit between the locking part 5 and the bolt in the initial stage of embedding. The normal direction of the V-shaped cross-section of the tooth tip portion 12 is set parallel to the radial surface of the locking part 5, so that the angle between the tooth tip portion 12 and the external thread of the bolt with a spiral structure is small, thereby further ensuring that the locking tooth 11 can be embedded in the external thread of the bolt, and will not cause too much influence on the thread fit between the locking part 5 and the bolt in the initial stage of embedding.

[0035] Example 8: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: An elastic layer 13 is sleeved on one end of the locking tooth 11 located at the tooth tip 12; The elastic layer 13 may be a rubber layer and connected by bonding, and the thickness of the elastic layer 13 may be set according to actual needs and experiments, which is a routine operation for technicians in the relevant technical field and will not be repeated here.

[0036] It can be seen from the present embodiment that, by setting the elastic layer 13, after the locking tooth 11 begins to embed into the external thread of the bolt, when the locking tooth 11 abuts against the tooth tip of the external thread of the bolt, the elastic layer 13 can be deformed to avoid jamming, thereby effectively ensuring that the locking part 5 is installed in place and the locking tooth 11 is embedded in the external thread of the bolt, thereby ensuring the effectiveness of the structure.

[0037] Example 9: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A sleeve 14 is interference-fitted in the first mounting hole 10 , and a limiting boss 15 is formed on the inner wall of the sleeve 14 , while the locking tooth 11 is provided with a limiting recess 16 adapted to the limiting boss 15 ; Among them, the surface of the locking tooth 11 is provided with an annular groove 17, and a sealing ring 18 is sleeved on the annular groove 17; At the same time, the sealing ring 18 can be made of rubber, and the limiting boss 15 and the sleeve 14 can be made of an integrated structure, and can be made of metal; Furthermore, the locking teeth 11 are loosely fitted with the inner wall of the sleeve 14 .

[0038] It can be seen from this embodiment that by providing the sleeve 14, providing a phase boss on the sleeve 14, and providing a phase recess on the locking tooth 11 corresponding thereto, it is convenient to limit the rotation of the locking tooth 11, thereby ensuring that the locking tooth 11 can be embedded in the external thread of the bolt. At the same time, the use of the sleeve 14 and the provision of the limiting boss 15 on the sleeve 14 can also reduce the difficulty of processing the locking portion 5 to a certain extent. The annular groove 17 on the locking tooth 11 and the sealing ring 18 provided at the annular groove 17 can create a certain friction resistance between the locking tooth 11 and the sleeve 14, thereby reducing the locking tooth 11 from falling out of the first mounting hole 10 when the anti-theft nut is not installed on the bolt, and can, to a certain extent, avoid setting an additional structure in the first mounting hole 10 to restrict the locking tooth 11 from falling out of the first mounting hole 10, further reducing the difficulty of processing the locking part 5.

[0039] Example 10: This embodiment provides a twist-off anti-theft nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The trigger member includes a push rod 19 and a return spring 20, and a second mounting hole 21 for mounting the push rod 19 and the return spring 20 is provided on the locking portion 5, and a guide inclined groove 22 is provided on the push rod 19; The end of the locking tooth 11 away from the tooth tip 12 is provided with a guide wedge portion 23 adapted to the guide bevel groove 22; At the same time, a slot adapted to the push rod 19 is provided on the lubricating gasket 9 .

[0040] It can be seen from this embodiment that by adopting the guide bevel groove 22 on the push rod 19 and the guide bevel wedge portion 23 at the end of the locking tooth 11, it is convenient to facilitate, after the locking part 5 is installed in place, to abut one end of the push rod 19 through the mounting surface, thereby pushing the push rod 19 to extend along the second mounting hole 21, and compressing the return spring 20, and pushing the guide bevel wedge portion 23 through the inclined surface formed by the guide bevel groove 22, thereby prompting the locking tooth 11 to move along the first mounting hole 10 and embed into the external thread of the bolt, thereby improving the stability and connection strength of the threaded connection between the locking part 5 and the bolt; The slot on the lubricating gasket 9 can ensure that there is no relative rotation between the lubricating gasket 9 and the locking part 5, thereby further ensuring that the toggle part 6 will not drive the locking part 5 when rotating, avoiding affecting the connection between the locking part 5 and the bolt, and effectively ensuring the anti-theft effect.

[0041] In the present application, it should be noted that the first mounting hole 10 and the second mounting hole 21 on the locking portion 5 are both formed by punching, and multiple locking members can be provided on the circumference. Moreover, since each point on the circumference of the internal thread is not on the same plane parallel to the radial direction of the locking portion 5, the installation positions of the multiple locking members in the axial direction of the locking portion 5 are all different. After the internal thread is opened, the locking portion 5 can be clamped by a clamp and the center position of the first mounting hole 10 formed on the surface of the locking portion 5 can be determined by measuring (for example, with a vernier caliper) the distance between the axial end of the locking portion 5 and the corresponding internal thread tooth tip at the position where the hole is to be punched. This is a conventional operation in the relevant technical field and will not be described in detail in this application. As for the installation of the sleeve 14 and the initial angle restriction of the locking tooth 11 after installation, the tooth tip 12 of the locking tooth 11 is V-shaped in cross-section and the normal is parallel to the radial surface of the locking portion 5. For example, a press-fitting device can be used, and an auxiliary head is provided on the press-fitting head, and a limiting concave and convex adapted to the limiting boss 15 is provided on the auxiliary head, and a clamp with an angle restriction on the locking portion 5 is used to install the sleeve 14 and limit the initial angle of the locking tooth 11 after installation, so that the tooth tip 12 of the locking tooth 11 is V-shaped in cross-section and the normal is parallel to the radial surface of the locking portion 5. The above-mentioned specific method and other methods that can also complete the installation of the sleeve 14 are all existing mature technologies and are routine operations of technicians in the technical field. This application will no longer limit or elaborate on them. The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A twist-off anti-theft nut, characterized in that: include: The main body has an internal thread (1); The wrench portion (2) is connected to one axial side of the main body, and a connecting portion (3) is provided between the main body and a twisting groove (4) is provided in the connecting portion (3); The surface of the main body is an arc-shaped surface, and the cross-sectional diameter size at one end close to the twisting portion (2) is smaller than the cross-sectional diameter size at one end away from the twisting portion (2).

2. The twist-off anti-theft nut according to claim 1, characterized in that: The main body comprises a locking portion (5) and a toggle portion (6) sleeved on the locking portion (5); A rotation gap (7) is formed between the locking portion (5) and the shifting portion (6), and the connecting portion (3) is connected to the locking portion (5), and the internal thread (1) is provided on the inner wall of the locking portion (5).

3. The twist-off anti-theft nut according to claim 2, characterized in that: The cross-sectional diameter of the locking portion (5) at one end close to the twisting portion (2) is larger than the cross-sectional diameter at one end away from the twisting portion (2).

4. The twist-off anti-theft nut according to claim 2, characterized in that: One end of the shifting portion (6) away from the connecting portion (3) extends toward one side of the main body axis to form an abutment portion (8); The abutting portion (8) can restrict the rotation of the toggle portion (6) after the locking portion (5) is locked, and can release the restriction on the rotation of the toggle portion (6) after the locking portion (5) is loosened.

5. The twist-off anti-theft nut according to claim 4, characterized in that: A lubricating gasket (9) is provided between the abutting portion (8) and the locking portion (5) along the axial direction of the main body.

6. The twist-off anti-theft nut according to claim 2, characterized in that: A first mounting hole (10) is provided in the locking portion (5), and a locking member for limiting the locking portion (5) from rotating around an axis is installed in the first mounting hole (10), and the locking member comprises a locking tooth (11) slidably connected to the first mounting hole (10) and a trigger member installed at an end of the locking portion (5) away from the connecting portion (3), and the trigger member is used to drive the locking tooth (11) to protrude from the inner wall of the locking portion (5); The locking teeth (11) are arranged corresponding to the tips of the internal threads (1) on the inner wall of the locking portion (5).

7. The twist-off anti-theft nut according to claim 6, characterized in that: One end of the locking tooth (11) close to the inner wall of the locking portion (5) forms a tooth tip portion (12) with a V-shaped cross section, and the normal direction of the V-shaped cross section of the tooth tip portion (12) is arranged parallel to the radial surface of the locking portion (5).

8. The twist-off anti-theft nut according to claim 7, characterized in that: An elastic layer (13) is sleeved on one end of the locking tooth (11) located at the tooth tip (12).

9. The twist-off anti-theft nut according to claim 6, characterized in that: A sleeve (14) is interference-fitted in the first mounting hole (10), and a limiting boss (15) is formed on the inner wall of the sleeve (14), and the locking tooth (11) is provided with a limiting recess (16) adapted to the limiting boss (15); The surface of the locking tooth (11) is provided with an annular groove (17), and a sealing ring (18) is sleeved on the annular groove (17).

10. The twist-off anti-theft nut according to claim 6, characterized in that: The trigger member includes a push rod (19) and a return spring (20), and a second mounting hole (21) for mounting the push rod (19) and the return spring (20) is provided on the locking portion (5), and a guide inclined groove (22) is provided on the push rod (19); Wherein, an end of the locking tooth (11) away from the tooth tip (12) is provided with a guide bevel wedge portion (23) adapted to the guide bevel groove (22).

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