Anti-theft bolt with sawtooth threads
By designing anti-theft bolts with serrated threads and elastic components, the problem of insufficient anti-theft effect of existing anti-theft bolts has been solved, achieving higher anti-disassembly difficulty and anti-theft effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-03
AI Technical Summary
Existing anti-theft bolts, which increase the difficulty of disassembly through irregularly shaped holes, are not effective enough in preventing theft.
The anti-theft bolt is designed with serrated threads and has three slots on the bolt head. Each slot contains an elastic component, including a spring and a stop. Special disassembly and assembly tools are required, including a reset component and a rotation component. The bolt is installed and removed by synchronous compression and rotation.
It significantly increases the anti-disassembly capability of the anti-theft bolts, requiring the use of two sets of matching tools for different locations, thus improving the anti-theft effect.
Smart Images
Figure CN224079454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fastener technology, specifically an anti-theft bolt with serrated threads. Background Technology
[0002] Anti-theft bolts are commonly used for the installation of outdoor facilities, such as street light poles and electrical cabinets. Anti-theft bolts increase the difficulty of bolt removal. Existing anti-theft bolts use specially shaped holes to increase the difficulty of bolt removal, but the anti-theft effect is still insufficient by using only this method. Utility Model Content
[0003] The purpose of this utility model is to provide an anti-theft bolt with serrated threads, which aims to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: the anti-theft bolt with serrated threads includes a bolt head and a stud. The outer surface of the stud is provided with serrated threads. One end of the bolt head has three slots arranged in a circumferential array. The side of the bolt head has a side hole that communicates with the slots. Each slot is provided with an elastic component. The elastic component includes a spring one. The upper end of the spring one is provided with a stop block. The stop block is slidably connected to the slot. The side of the stop block is provided with a groove. The groove is provided with a spring two. One end of the spring two is provided with a protrusion. The protrusion can extend into the side hole and can be completely retracted into the groove.
[0005] Preferably, the slot is a rectangular slot, and the outer side of the stop block contacts the inner side of the slot and can move along the inner side of the slot.
[0006] Preferably, the upper end of the slot is provided with an inner edge, and the upper end of the stop is provided with a slot that mates with the inner edge.
[0007] Preferably, one end of the protrusion is provided with a hemispherical shape.
[0008] Preferably, the screw head is configured as a frustum shape.
[0009] The beneficial effects of this utility model are:
[0010] When installing and removing this type of anti-theft bolt, two matching tools are required, each corresponding to a different position on the anti-theft bolt. Furthermore, the three protrusions and three stops must be pressed simultaneously, which significantly increases the anti-disassembly capability of the anti-theft bolt and provides a good anti-theft effect. Attached Figure Description
[0011] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.
[0012] Figure 2 This is a partial structural diagram of the slot.
[0013] Figure 3 This is a structural diagram of a wrench.
[0014] Figure 4 This is a structural diagram of the chassis and cover plate.
[0015] Figure 5 This is a schematic diagram of the structure inside the cover plate.
[0016] Figure 6 This is a schematic diagram of the internal structure of the chassis.
[0017] Figure 7 This is a structural diagram for use.
[0018] In the diagram: 1. Screw head; 2. Stud; 3. Slot; 4. Side hole; 5. Spring 1; 6. Stop block; 7. Spring 2; 8. Protrusion; 9. Inner edge; 10. Wrench; 11. Fixing post; 12. Chassis; 13. Cover plate; 14. Top rod; 15. Bottom block; 16. Guide rod; 17. Shaft; 18. Extrusion plate; 19. Handle. Detailed Implementation
[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0020] like Figure 1-7 As shown, an anti-theft bolt with serrated threads includes a screw head 1 and a stud 2. The outer surface of the stud 2 is provided with serrated threads. One end of the screw head 1 has three slots 3 arranged in a circumferential array. The side of the screw head 1 has a side hole 4 that communicates with the slots 3. Each slot 3 is provided with an elastic component inside. The elastic component includes a spring 5. The upper end of the spring 5 is provided with a stop block 6. The stop block 6 is slidably connected to the slot 3. The side of the stop block 6 is provided with a groove. The groove is provided with a spring 7. One end of the spring 7 is provided with a protrusion 8. One end of the protrusion 8 is provided with a hemispherical shape. The protrusion 8 can extend into the side hole 4 and can be completely stored in the groove.
[0021] When installing and removing the anti-theft bolt, a special disassembly and assembly tool is required. The tool consists of two parts: a reset component, which is used to retract the protrusion 8 that extends into the side hole 4 into the groove; and a rotating component, which is used to drive the screw head 1 and the stud 2 to rotate.
[0022] Specifically, the reset assembly includes a chassis 12 and a cover plate 13 disposed on the upper end of the chassis 12. The cover plate 13 is rotatably connected to the chassis 12. An annular groove is provided at the upper end of the chassis 12, and the cover plate 13 is located in the annular groove, thereby allowing the cover plate 13 to rotate on the chassis 12 while preventing the cover plate 13 from separating from the chassis 12. At the same time, three sets of ejection units are provided inside the chassis 12. The ejection unit includes a push rod 14 that passes through the chassis 12 and is slidably connected to the chassis 12. A base block 15 is provided on the lower surface of the push rod 14. The chassis 12 has a guide rod 16 inside, and the bottom block 15 is penetrated by the guide rod 16. This allows the top rod 14 to move linearly along the guide rod 16 through the bottom block 15, preventing the top rod 14 from rotating during movement. Simultaneously, two rotating shafts 17 are provided on the upper surface of the top rod 14, with a 2mm gap between them. Three extrusion plates 18 are evenly arranged on the inner side of the cover plate 13. The extrusion plates 18 are inclined and located between the two rotating shafts 17, and they extrude... Both ends of plate 18 are designed as hooks, and handles 19 are provided on both the base 12 and the cover plate 13. The base 12 and the cover plate 13 are connected by a spring 3, which is located between the base 12 and the cover plate 13 and is always in a stretched state. In the initial state, the angle between the handles 19 on the base 12 and the cover plate 13 is approximately 35°, at which point the spring 3 is in its minimum stretched state, and the distance between the pivot 17 and the inner ring of the base 12 is at its maximum. When one hand simultaneously grips... With both handles 19 in place, the handle 19 on the chassis 12 is held still. By gripping the handle 19 on the cover plate 13 with your fingers, the included angle between the two handles 19 is reduced. When the cover plate 13 rotates, the pressing plate 18 located below the cover plate 13 will also rotate and will press the rotating shaft 17, thereby causing the top rod 14 to move towards the inner ring of the chassis 12. When the handle 19 on the cover plate 13 is released, the cover plate 13 will return to its original position under the action of the spring 3, and the included angle between the two handles 19 will return to about 35°.
[0023] The rotating assembly includes a wrench 10 and a fixing post 11 disposed on the lower surface of one end of the wrench 10. The three fixing posts 11 can be inserted into the slot 3 at the same time. Meanwhile, the wrench 10 is provided with an observation groove to facilitate observation of whether the fixing posts 11 are aligned with the slot 3.
[0024] When installing or removing bolts, first use the reset assembly to place the base 12 in the position of the screw head 1, ensuring the inner surface of the base 12 is in contact with the outer surface of the screw head 1. Then, turn the handle 19 to extend the push rod 14 inside the base 12 towards the screw head 1. If the push rod 14 initially cannot extend, it indicates that the push rod 14 is in contact with the outer surface of the screw head 1. Therefore, it is necessary to fine-tune the position of the base 12. During the fine-tuning process, continuously hold both handles 19 until the handles 19 can be rotated. At this point, the push rod 14 can enter the side hole 4 of the screw head 1. When the push rod 14 extends towards the screw head 1... After the length is set, most of the hemispherical end of the protrusion 8 is located in the groove, and a small part is located in the side hole 4. Due to the restriction of the hooks at both ends of the pressing plate 18, the cover plate 13 cannot continue to rotate, and the included angle between the two handles 19 cannot be further reduced. Then, the other hand picks up the wrench 10, aligns the fixing post 11 with the slot 3, and then presses the stop block 6. The protrusion 8 inside the stop block 6 can no longer prevent the stop block 6 from moving to the bottom of the slot 3. Therefore, when the fixing post 11 is inserted into the slot 3, the screw head 1 can be rotated by the wrench 10, which in turn drives the stud 2 to rotate, thereby realizing the installation or removal of the bolt.
[0025] In normal conditions, part of the protrusion 8 of this type of anti-theft bolt is located in the groove and the other part is located in the side hole 4. Therefore, if the stop block 6 is pressed by the fixing post 11 alone, the fixing post 11 will not be able to enter the slot 3, and thus cannot drive the screw head 1 and the stud 2 to rotate.
[0026] Furthermore, the slot 3 is a rectangular slot, and the outer side of the stop 6 contacts the inner side of the slot 3 and can move along the inner side of the slot 3 to prevent the stop 6 from rotating when it moves up and down in the slot 3.
[0027] Furthermore, the upper end of the slot 3 is provided with an inner edge 9, and the upper end of the stop block 6 is provided with a slot that matches the inner edge 9, so as to prevent the protrusion 8 from failing to accurately enter the side hole 4, which would cause the stop block 6 to accidentally come out of the slot 3.
[0028] Furthermore, the screw head 1 is designed in a frustum shape, which increases the difficulty of directly clamping the screw head 1.
[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
Claims
1. A security bolt having a jagged thread, characterized by, The utility model relates to a screw head and stud, the outer surface of the stud is provided with sawtooth thread, the one end of the screw head is provided with three insertion slots in the circumference, the side of the screw head is provided with side hole which is in communication with the insertion slot, the inside of each insertion slot is provided with elastic component, the elastic component includes spring one, the upper end of spring one is provided with stopper, the stopper is slidably connected with the insertion slot, the side of stopper is provided with recess, the inside of recess is provided with spring two, one end of spring two is provided with convex, the convex can extend into the side hole, the convex can be completely received in recess.
2. The anti-theft bolt having a saw-tooth thread according to claim 1, wherein The insertion slot is a rectangular slot, the outer side of the stopper is in contact with the inner side of the insertion slot and can move along the inner side of the insertion slot.
3. The anti-theft bolt having a saw-tooth thread according to claim 2, characterized in that, The upper end of the insertion slot is provided with an inner edge, and the upper end of the stopper is provided with a clamping groove matched with the inner edge.
4. The anti-theft bolt having a saw-tooth thread according to claim 1, wherein One end of the convex is provided with a semicircular spherical shape.
5. The tamperproof bolt having a buttress thread according to any one of claims 1 to 4, characterized in that The screw head is provided in a circular truncated cone shape.