Anti-loose and anti-theft bolt

By designing forward and reverse threads on the bolt and an interlocking structure of a check ring and a spring washer, the problems of easy loosening and insufficient anti-theft performance of traditional bolts are solved, achieving the effect of preventing loosening and theft.

CN223635084UActive Publication Date: 2025-12-05SHANXI JIAOKE NEW MATERIALS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520022835.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-06
Publication Date
2025-12-05
Estimated Expiration
2035-01-06

AI Technical Summary

Technical Problem

Traditional bolts are prone to loosening under vibration and impact, leading to connection failure, and their anti-theft performance is insufficient.

Method used

The screw is designed with a forward and reverse thread structure, combined with a check ring and a spring washer. The different directions of the forward and reverse external threads, as well as the interlocking structure of the check ring and the spring washer, achieve the effect of preventing loosening and theft.

Benefits of technology

It improves the bolt's anti-loosening performance under vibration and impact, enhances anti-theft capabilities, and ensures the stability and security of the connection.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to an anti-loose and anti-theft bolt, and belongs to the technical field of fasteners. Comprising a screw rod, a spring washer, a fastening nut and a locknut, a head part is fixedly arranged at one end of the screw rod, a forward external thread is arranged at one end, close to the head part, of the outer side cylindrical surface of the screw rod, a reverse external thread is arranged at one end, far away from the head part, of the outer side cylindrical surface of the screw rod, and three outer side avoiding grooves are formed in the reverse external thread; the outer side of the forward external thread is in threaded connection with a fastening nut, and three inner side avoiding grooves are formed in the inner side face of the fastening nut. The outer side of the reverse external thread is in threaded connection with a locknut, the end faces of the sides, close to each other, of the fastening nut and the locknut are each fixedly provided with a non-return ring, the portion, between the two non-return rings, of the outer side of the screw rod is sleeved with a spring washer, and the spring washer makes contact with the two non-return rings; the problem that an existing fastening bolt for a roadside anti-glare panel on a highway and a bridge is poor in anti-loosening and anti-theft effect is solved.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fastener, specifically relates to a lock bolt. BACKGROUND

[0002] In the field of fastener, the lock and theft prevention of bolt has been the focus of engineers. When the traditional bolt is subjected to external forces such as vibration and impact, it is easy to loosen, leading to connection failure, and further causing equipment failure or safety accidents. At the same time, in some occasions with high safety requirements, such as roadside anti-dazzle plates on highways and bridges, it is also very important to prevent the theft of bolts.

[0003] Most of the bolts on the market currently adopt a single thread structure, which is connected by tightening the nut. However, this structure is prone to connection failure due to thread wear and loosening when used for a long time or subjected to external forces. In addition, the anti-theft performance of traditional bolts is also weak and can be easily disassembled by criminals. SUMMARY

[0004] The utility model overcomes the defects of the prior art and provides a lock and theft prevention bolt, which solves the problem of poor lock and theft prevention effect of the fastening bolt used for roadside anti-dazzle plates on highways and bridges.

[0005] In order to achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme.

[0006] A lock and theft prevention bolt, comprising a screw rod, a spring washer, a fastening nut and a lock nut, wherein a head is fixedly arranged at one end of the screw rod, a forward external thread is arranged at one end of the outer cylindrical surface of the screw rod close to the head, a reverse external thread is arranged at one end of the outer cylindrical surface of the screw rod away from the head, and three outer avoiding grooves are arranged at the reverse external thread; the fastening nut is screwed on the outer side of the forward external thread, and three inner avoiding grooves are arranged on the inner side of the fastening nut; the lock nut is screwed on the outer side of the reverse external thread, and one check ring is fixedly arranged on each side end face of the fastening nut and the lock nut, respectively; a spring washer is sleeved on the outer side of the screw rod between the two check rings, and the spring washer is in contact with the two check rings, respectively.

[0007] Further, the screw rod is an equal-diameter round rod structure, and the head is a regular hexagonal column structure.

[0008] Further, the rotation direction of the forward external thread is opposite to that of the reverse external thread, the length of the forward external thread is greater than that of the reverse external thread, and the outer cylindrical surface of the screw rod is provided with a transition section without external thread between the forward external thread and the reverse external thread.

[0009] Further, three outer side relief grooves are arranged in a circular array around the axis of the screw rod, and each of the three outer side relief grooves is consistent with the length of the reverse external thread.

[0010] Further, the cross section of the outer side relief groove is a fan-shaped structure, and the corresponding angle of the fan-shaped structure is greater than 60°, and the inner bottom surface of the outer side relief groove is located inside the outer cylindrical surface of the screw rod.

[0011] Further, three inner side relief grooves are arranged in a circular array around the axis of the fastening nut, the inner side relief grooves are arranged along the axis of the fastening nut, and the two ends of the inner side relief grooves are in communication with the two ends of the fastening nut; the cross section of the inner side relief groove is a fan-shaped structure, and the corresponding angle of the fan-shaped structure is greater than 60°.

[0012] Further, the thickness of the lock nut is less than the length of the transition section.

[0013] Further, the check ring is a cylindrical structure with two open ends, and the two check rings are coaxially arranged with the fastening nut and the lock nut respectively, and the two check rings are sleeved on the outer side of the screw rod.

[0014] Further, a ring of engagement teeth is arranged on each of the two side end faces of the check ring close to the spring washer; a ring of engagement teeth is arranged on each of the two side end faces of the spring washer close to the two check rings, and the engagement teeth on the two side end faces of the spring washer face opposite directions; the ring of engagement teeth on each of the two check rings is embedded with the ring of engagement teeth on the two side end faces of the spring washer.

[0015] Further, the engagement teeth are a triangular prism structure, the triangular prism structure comprises two mutually perpendicular prism faces, an inclined prism face and front and back two end faces, the first perpendicular prism face is parallel to and fixedly connected with the end face of the check ring and the spring washer; the second perpendicular prism face is perpendicular to the end face of the check ring and the spring washer; and the included angle between the inclined prism face and the end face of the check ring and the spring washer is an acute angle.

[0016] The beneficial effects of the utility model relative to the prior art are:

[0017] Compared with the traditional bolt, the overall diameter of the screw rod is the same, and the processing difficulty is reduced; different specifications of check rings are added to the lock nut, so that the thickness range of the clamped workpiece of the lock bolt is wider; the cooperation of the check ring and the special spring washer enables the bolt to achieve absolute lock and theft prevention during operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described in detail in combination with the drawings:

[0019] Figure 1is the overall perspective view of the utility model Figure One ;

[0020] Figure 2 is the overall perspective view of the utility model Figure Two ;

[0021] Figure 3 is the side view of the utility model;

[0022] Figure 4 is the overall exploded view of the utility model Figure One ;

[0023] Figure 5 is the overall exploded view of the utility model Figure Two ;

[0024] Figure 6 is the perspective view of the screw rod;

[0025] Figure 7 is the perspective view of the fastening nut Figure One ;

[0026] Figure 8 is the perspective view of the fastening nut Figure Two ;

[0027] Figure 9 is the perspective view of the locking nut Figure One ;

[0028] Figure 10 is the perspective view of the locking nut Figure Two ;

[0029] Figure 11 is the perspective view of the spring washer Figure One ;

[0030] Figure 12 is the perspective view of the spring washer Figure Two ;

[0031] Wherein, 1 is screw rod, 2 is head, 3 is positive external thread, 4 is reverse external thread, 5 is transition section, 6 is outer side avoiding groove, 7 is fastening nut, 8 is inner side avoiding groove, 9 is locking nut, 10 is reverse ring, 11 is spring washer, 12 is engaging tooth. DETAILED DESCRIPTION

[0032] In order to make the technical problem, technical scheme and beneficial effect to be solved by the utility model more clear and obvious, combining with the embodiment and the drawings, the utility model is further explained in detail.The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.The technical scheme of the utility model is explained in detail below combining with the embodiment and the drawings, but the protection scope is not limited by this.

[0033] As Figure 1 The utility model provides a kind of anti-loose theft-proof bolt, including screw rod 1, spring washer 11, fastening nut 7, lock nut 9.

[0034] The screw rod 1 is equal diameter round rod structure, head 2 is fixedly arranged at one end of screw rod 1, and the head 2 is regular hexagon column structure. Positive external thread 3 is arranged at the end of the outer cylindrical surface of screw rod 1 close to head 2, and reverse external thread 4 is arranged at the end of the outer cylindrical surface of screw rod 1 away from head 2. The rotation direction of positive external thread 3 is opposite to that of reverse external thread 4. The length of positive external thread 3 is greater than that of reverse external thread 4, and the outer cylindrical surface of screw rod 1 is provided with a transition section 5 without external thread between positive external thread 3 and reverse external thread 4.

[0035] Three outer side relief grooves 6 are arranged at the reverse external thread 4, and the three outer side relief grooves 6 are circularly arranged around the axis of the screw rod 1. The length of the three outer side relief grooves 6 is consistent with that of the reverse external thread 4. The cross section of the outer side relief groove 6 is a sector structure, and the corresponding angle of the sector structure is greater than 60°. The inner bottom surface of the outer side relief groove 6 is located inside the outer cylindrical surface of the screw rod 1.

[0036] The fastening nut 7 is screwed on the outside of the positive external thread 3. The inner side of the fastening nut 7 is provided with a positive internal thread, and the positive internal thread is screwed with the positive external thread 3. Three inner side relief grooves 8 are arranged on the inner side of the fastening nut 7. The three inner side relief grooves 8 are circularly arranged around the axis of the fastening nut 7. The inner side relief grooves 8 extend along the axis of the fastening nut 7. The two ends of the inner side relief grooves 8 are connected to the two ends of the fastening nut 7. The cross section of the inner side relief groove 8 is a sector structure, and the corresponding angle of the sector structure is greater than 60°.

[0037] The lock nut 9 is screwed on the outside of the reverse external thread 4. The inner side of the lock nut 9 is provided with a reverse internal thread, and the reverse internal thread is screwed with the reverse external thread.

[0038] The thickness of the lock nut 9 is less than the length of the transition section 5.

[0039] One check ring 10 is fixedly arranged on each side end face of the fastening nut 7 and the lock nut 9, respectively. The check ring 10 is a cylindrical structure with two open ends. The two check rings 10 are coaxially arranged with the fastening nut 7 and the lock nut 9, respectively. The two check rings 10 are sleeved on the outside of the screw rod 1.

[0040] A spring washer 11 is sleeved on the outside of the screw rod 1 between the two check rings 10. The spring washer 11 is in contact with the two check rings 10, respectively.

[0041] A set of engagement teeth 12 is arranged on each side end surface of the two check rings 10 close to the spring washer 11. A set of engagement teeth 12 is arranged on each side end surface of the spring washer 11 close to the two check rings 10, and the engagement teeth 12 on the two side end surfaces of the spring washer 11 face opposite directions. The set of engagement teeth 12 on each check ring 10 is engaged with the set of engagement teeth 12 on each side end surface of the spring washer 11.

[0042] The engagement teeth 12 are in a triangular prism structure, which includes two mutually perpendicular prism surfaces, an inclined prism surface, and front and back end surfaces. The first perpendicular prism surface is parallel to and fixedly connected with the end surface of the check ring 10 and the spring washer 11. The second perpendicular prism surface is perpendicular to the end surface of the check ring 10 and the spring washer 11. The angle between the inclined prism surface and the end surface of the check ring 10 and the spring washer 11 is an acute angle.

[0043] The working principle of the utility model is as follows:

[0044] Before use, the fastening nut 7, the lock nut 9, and the spring washer 11 are detached from the threaded rod 1.

[0045] When used again, the fixed part is sleeved on the outer side of the threaded rod 1, so that the fixed part is in contact with the head 2 of the threaded rod 1. Then the fastening nut 7 is screwed at the normal external thread 3 of the threaded rod 1 after passing through the reverse external thread 4 and the transition section 5, so that the fastening nut 7 is in close contact with the fixed part.

[0046] When the fastening nut 7 passes through the reverse external thread 4, the external side relief groove 6 at the reverse external thread 4 and the internal side relief groove 8 of the fastening nut 7 are staggered, so that the fastening nut 7 can smoothly pass through the reverse external thread 4. Since the thickness of the transition section 5 of the threaded rod 1 is greater than the length of the fastening nut 7, the fastening nut 7 can be screwed on the normal external thread 3 with sufficient space without being disturbed by the reverse external thread 4.

[0047] Then, the spring washer 11 is sleeved on the outer side of the threaded rod 1, so that the spring washer 11 is in contact with the check ring 10 on the fastening nut 7, and the set of engagement teeth 12 on the side of the spring washer 11 close to the fastening nut 7 is engaged with the set of engagement teeth 12 on the check ring 10 of the fastening nut 7.

[0048] Then, the lock nut 9 is screwed at the reverse external thread 4 of the threaded rod 1 until the check ring 10 on the lock nut 9 is in close contact with the spring washer 11. At this time, the spring washer 11 is compressed, and the set of engagement teeth 12 on the check ring 10 of the lock nut 9 is engaged with the set of engagement teeth 12 on the side of the spring washer 11 close to the lock nut 9. Thus, the fixed part is firmly fixed.

[0049] During the process of tightening the lock nut 9, the engaging teeth 12 on the reverse ring 10 of the lock nut 9 gradually engage with the engaging teeth 12 on the spring washer 11, and as the lock nut 9 is continuously tightened, the inclined prismatic surface of the engaging teeth 12 on the reverse ring 10 of the lock nut 9 continuously contacts the inclined prismatic surface of the engaging teeth 12 on the spring washer 11, so as to ensure that the lock nut 9 is continuously tightened, and the spring washer 11 is continuously compressed, and the elastic force of the spring washer 11 ensures that the engaging teeth 12 on the spring washer 11 are tightly engaged with the engaging teeth 12 on the reverse ring 10 of the lock nut 9. If the lock nut 9 is intended to be loosened in the loosening direction, the second vertical prismatic surface of the engaging teeth 12 on the reverse ring 10 of the lock nut 9 blocks the second vertical prismatic surface of the engaging teeth 12 on the spring washer 11, so that the lock nut 9 cannot be loosened. Moreover, as the tightening nut 7 and the lock nut 9 have opposite screw directions, the tightening nut 7 and the lock nut 9 cannot be simultaneously rotated in the same direction, so as to further improve the anti-loosening effect of the lock nut 9.

[0050] As the engaging teeth 12 on the reverse ring 10 of the tightening nut 7 and the engaging teeth 12 on the spring washer 11 are engaged with each other, the spring washer 11 cannot idle relative to the tightening nut 7, so as to ensure that the spring washer 11 is in a fixed state. As the engaging teeth 12 on the reverse ring 10 of the lock nut 9 and the engaging teeth 12 on the spring washer 11 are engaged with each other, the lock nut 9 cannot be rotated in the loosening direction, so as to ensure the overall anti-loosening and anti-theft effects.

[0051] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A type of anti-loosening and anti-theft bolt, characterized in that: It includes screw rod (1), spring washer (11), fastening nut (7), lock nut (9), head (2) is fixedly arranged at one end of screw rod (1), positive external thread (3) is arranged at one end of the outer cylindrical surface of screw rod (1) close to head (2), reverse external thread (4) is arranged at one end of the outer cylindrical surface of screw rod (1) away from head (2), three outer side avoiding grooves (6) are arranged at reverse external thread (4); fastening nut (7) is screwed on the outer side of positive external thread (3), three inner side avoiding grooves (8) are arranged on the inner side of fastening nut (7); lock nut (9) is screwed on the outer side of reverse external thread (4), one check ring (10) is fixedly arranged on the side end face of fastening nut (7) and lock nut (9) close to each other respectively, spring washer (11) is sleeved on the outer side of screw rod (1) between two check rings (10), spring washer (11) is in contact with two check rings (10) respectively.

2. The tamper-proof bolt according to claim 1, wherein: The screw rod (1) is an equal-diameter round rod structure, and the head (2) is a regular hexagonal column structure.

3. The tamper-proof bolt according to claim 1, wherein: The rotation direction of the positive external thread (3) is opposite to that of the reverse external thread (4), the length of the positive external thread (3) is greater than that of the reverse external thread (4), and the outer cylindrical surface of the screw rod (1) is provided with a transition section (5) without external thread between the positive external thread (3) and the reverse external thread (4).

4. The tamper-proof bolt according to claim 1, wherein: The three outer side avoiding grooves (6) are circularly arranged around the axis of the screw rod (1), and the lengths of the three outer side avoiding grooves (6) are consistent with that of the reverse external thread (4).

5. The tamper-proof bolt according to claim 4, wherein: The cross section of the outer side avoiding groove (6) is a sector structure, the corresponding angle of the sector structure is greater than 60°, and the inner bottom surface of the outer side avoiding groove (6) is located inside the outer cylindrical surface of the screw rod (1).

6. The tamper-proof bolt according to claim 1, wherein: The three inner side avoiding grooves (8) are circularly arranged around the axis of the fastening nut (7), the inner side avoiding grooves (8) are arranged along the axis of the fastening nut (7), and the two ends of the inner side avoiding grooves (8) are in communication with the two ends of the fastening nut (7); the cross section of the inner side avoiding groove (8) is a sector structure, and the corresponding angle of the sector structure is greater than 60°.

7. The tamper-proof bolt according to claim 3, wherein: The thickness of the lock nut (9) is less than the length of the transition section (5).

8. The tamper-proof bolt according to claim 1, wherein: The check ring (10) is a cylindrical structure with two open ends, the two check rings (10) are coaxially arranged with the fastening nut (7) and the lock nut (9) respectively, and the two check rings (10) are sleeved on the outer side of the screw rod (1).

9. The tamper-proof bolt according to claim 1, wherein: A ring of engaging teeth (12) is arranged on the side end face of each of the two check rings (10) close to the spring washer (11); a ring of engaging teeth (12) is arranged on the two side end faces of the spring washer (11) close to the two check rings (10), and the engaging teeth (12) on the two side end faces of the spring washer (11) face opposite directions; the ring of engaging teeth (12) on each of the two check rings (10) is engaged with the ring of engaging teeth (12) on the two side end faces of the spring washer (11) respectively.

10. The tamper-proof bolt according to claim 9, wherein: The engaging tooth (12) is a triangular prism structure, which comprises two mutually perpendicular prism faces, an oblique prism face and front and rear end faces, the first perpendicular prism face is parallel to and fixedly connected with the end face of the check ring (10) and the spring washer (11); the second perpendicular prism face is perpendicular to the end face of the check ring (10) and the spring washer (11); and the included angle between the oblique prism face and the end face of the check ring (10) and the spring washer (11) is an acute angle.