Anti-disassembly fastening structure

Abstract

The utility model discloses an anti-disassembly fastening structure which is used for fixing a product outer plate on a product inner plate and improving the protection safety of a product. The double-end reducing bolt comprises a bolt head and a double-end reducing bolt body. The bolt head is provided with a connecting hole, a first internal thread is arranged in the connecting hole, the bolt head is further provided with a first external thread, and the thread pitch of the first external thread is larger than that of the first internal thread; a second external thread is arranged at the small-diameter end of the variable-diameter double-end thread, the second external thread is matched with the first internal thread to be used for fixing the small-diameter end in the connecting hole, and a fracture groove is formed between the large-diameter end and the small-diameter end of the double-end variable-diameter bolt. And the breaking groove is used for breaking when the bolt head is screwed out of the product outer plate.

Description

Technical Field

[0001] The present application relates to the technical field of product safety protection, and in particular to an anti-dismantling fastening structure. Background Art

[0002] As an important means to ensure product integrity and prevent unauthorized disassembly and tampering, anti-tampering measures are widely used in electronic products, medical equipment, precision instruments and other equipment. Traditional anti-tampering measures mainly rely on stickers, such as fragile stickers and adhesive stickers. Stickers indicate whether the product has been illegally opened or modified by physically breaking or leaving adhesive marks that are difficult to remove.

[0003] However, the traditional anti-tampering sticker method has certain limitations. First, the glue on the sticker is prone to aging after long-term use or in harsh environmental conditions, resulting in reduced viscosity or even failure, which makes it impossible to effectively prevent or accurately record illegal disassembly of the product; second, traditional anti-tampering stickers often lack anti-counterfeiting properties, their design is relatively simple and easy to be imitated. When the sticker is damaged, it is impossible to ensure whether the damage is caused by unauthorized disassembly or counterfeiting, resulting in poor protection of the device by traditional anti-tampering methods.

[0004] Therefore, there is an urgent need for a product anti-disassembly structure with high protection safety to solve the problem of poor protection effect of traditional anti-disassembly means. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides an anti-dismantling fastening structure, which can improve the protection safety of the product.

[0006] The present application provides an anti-disassembly fastening structure, which is used to fix a product outer panel to a product inner panel, and includes:

[0007] A bolt head and a double-headed reducing bolt, wherein the bolt head cooperates with the double-headed reducing bolt;

[0008] The bolt head is provided with a connecting hole, the connecting hole is provided with a first internal thread, the bolt head is further provided with a first external thread, and the pitch of the first external thread is greater than the pitch of the first internal thread;

[0009] The small diameter end of the reducing double-start thread is provided with a second external thread, and the second external thread cooperates with the first internal thread to fix the small diameter end in the connecting hole. A breaking groove is provided between the large diameter end and the small diameter end of the double-start reducing bolt, and the breaking groove is used to break the bolt head when it is screwed out from the outer plate of the product.

[0010] Optionally, a thread adhesive is provided between the large diameter end and the inner plate of the product, and the thread adhesive is used to fix the large diameter end in the inner plate of the product.

[0011] Optionally, a glue storage groove is provided at the thread of the large-diameter end. The glue storage groove is filled with thread glue. The notch of the glue storage groove is sealed by a film, and the film is controllably tearable.

[0012] Optionally, a screw hole matching the bolt head is provided on the outer plate of the product, and the diameter of the large-diameter end is smaller than the inner diameter of the screw hole.

[0013] Optionally, an anti-loosening structure is provided on the end face of the small-diameter end, and a limiting structure is provided on the bottom surface of the connecting hole. The anti-loosening structure and the limiting structure cooperate to prevent the small-diameter end from withdrawing from the connecting hole.

[0014] Optionally, a retractable one-way buckle is provided on the second internal thread of the inner plate of the product, and a bump is provided on the third external thread of the large-diameter end. The one-way buckle and the bump cooperate to prevent the large-diameter end from withdrawing from the direction of the outer plate of the product.

[0015] Optionally, the bottom of the fracture groove extends in the direction of the central axis of the small-diameter end.

[0016] Optionally, the cross-section of the fracture groove parallel to the central axis is in the shape of "V" or "U" or "W".

[0017] Optionally, an internal hexagonal groove or a slotted screwdriver groove or a Phillips screwdriver groove is provided at the end of the large-diameter end.

[0018] Optionally, there is an engagement relationship between the third external thread of the large-diameter end and the third internal thread of the outer plate of the product, and the pitch of the third external thread is smaller than the pitch of the third internal thread;

[0019] Or,

[0020] The pitch of the third external thread is larger than the pitch of the third internal thread.

[0021] It can be seen from the above technical solutions that the present application has the following effects:

[0022] In this application, the outer panel of the product is fixed to the inner panel of the product through the cooperation of a bolt head and a double-headed stepped bolt. A connection hole is provided on the bolt head, and a first internal thread is provided in the connection hole. A second external thread is provided at the small-diameter end of the double-headed stepped bolt, and the small-diameter end is fixed in the connection hole through thread cooperation. A first external thread is provided on the outer surface of the bolt head, and the pitch of the first external thread is greater than the pitch of the first internal thread. Therefore, during the anti-disassembly process, when it is necessary to screw out the bolt head on the outer panel of the product, the large-diameter end is fixed in the inner panel of the product. Due to the difference in pitch between the first internal thread and the first external thread, the pitch of the bolt head is large, and the moving distance is large when rotating the same angle. The pitch of the small-diameter end is small and the moving distance is small, resulting in the fracture groove between the small-diameter end and the large-diameter end being pulled apart, thus achieving anti-disassembly. After disassembly, it is irreversible. Therefore, compared with the frangible stickers and glue-retaining stickers in the prior art, the fracture groove of this application cannot be restored after fracture, so it has a higher safety protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 An exploded schematic diagram of an anti-disassembly fastening structure of this application;

[0025] Figure 2 A schematic diagram of an embodiment of an anti-disassembly fastening structure of this application;

[0026] Figure 3 A cross-sectional schematic diagram of an anti-disassembly fastening structure of this application;

[0027] Figure 4 A schematic diagram of a glue storage groove in an anti-disassembly fastening structure of this application;

[0028] Figure 5 A schematic diagram of an anti-loosening structure in an anti-disassembly fastening structure of this application;

[0029] Figure 6 A schematic diagram of a one-way buckle in an anti-disassembly fastening structure of this application;

[0030] Among them, bolt head 01, double-headed stepped bolt 02, first internal thread 03, first external thread 04, small-diameter end 05, second external thread 06, large-diameter end 07, fracture groove 08, product outer panel 09, product inner panel 10, glue storage groove 11, film 12, anti-loosening structure 13, second internal thread 14, one-way buckle 15, third external thread 16. Detailed implementation manners

[0031] In the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to illustrate the relative positional relationship between each component or component part, and does not particularly limit the specific installation orientation of each component or component part.

[0032] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0033] In addition, the terms "installed", "set up", "provided with", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, components or component parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In addition, the structures, proportions, sizes, etc. drawn in the drawings in this application are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions that can be implemented in this application. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by this application and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0036] In view of the fact that some products use fragile stickers, glue-retaining stickers, etc., the aging of the glue over a long time will cause the anti-tampering function to fail. At the same time, because the anti-tampering stickers do not have anti-counterfeiting characteristics and are easy to imitate, there is a problem of protection risk. The present application provides an anti-tampering fastening structure to improve the protection safety of products. The specific implementation process of the present application is described as follows.

[0037] Please refer to Figures 1 to 6 , a tamper-proof fastening structure provided by the present application for fixing a product outer plate on a product inner plate, including:

[0038] A bolt head 01 and a double-headed variable-diameter bolt 02; the bolt head 01 is provided with a connection hole, a first internal thread 03 is arranged in the connection hole, the bolt head 01 is further provided with a first external thread 04, and the pitch of the first external thread 04 is greater than the pitch of the first internal thread 03; the small-diameter end 05 of the variable-diameter double-headed thread is provided with a second external thread 06, and the second external thread 06 is matched with the first internal thread 03 to fix the small-diameter end 05 in the connection hole. A fracture groove 08 is arranged between the large-diameter end 07 and the small-diameter end 05 of the double-headed variable-diameter bolt 02, and the fracture groove 08 is used for disconnecting when the bolt head 01 is screwed out from the product outer plate 09.

[0039] Regarding the bolt head 01: A connection hole for connecting with the double-headed variable-diameter bolt 02 is designed in the center of the bolt head 01. On the inner wall of the connection hole, a first internal thread 03 is machined; the outside of the bolt head 01 is designed with a first external thread 04, and the pitch of the first external thread 04 (i.e., the distance between adjacent two threads) is greater than the pitch of the first internal thread 03 in the connection hole. A groove for controlling the rotation of the bolt head 01 is arranged at the top of the bolt head 01. The groove can be in the shape of a straight slot, a cross slot or an internal hexagon, etc. Specifically, it is not limited here and shall be subject to what can be achieved.

[0040] Regarding the double-headed variable-diameter bolt 02: One end of the double-headed variable-diameter bolt 02 is designed to have a smaller diameter (small-diameter end 05). A second external thread 06 is machined outside the small-diameter end 05. This second external thread 06 is matched with the first internal thread 03 in the above-mentioned connection hole, so that the small-diameter end 05 can be screwed into the connection hole of the bolt head 01 to achieve a firm connection between the two. The other end opposite to the small-diameter end 05 is designed to have a larger diameter (large-diameter end 07), and the large-diameter end 07 is used to contact the product inner plate 10 or other components that need to be fastened.

[0041] A fracture groove 08 is designed between the small-diameter end 05 and the large-diameter end 07 of the double-headed variable-diameter bolt 02. The function of the fracture groove 08 is that in a specific situation (such as when the bolt head 01 needs to be disassembled), the large-diameter end 07 and the small-diameter end 05 can be separated due to the disconnection at the position of the fracture groove 08. In terms of product anti-tampering, since the double-headed variable-diameter bolt 02 is disconnected at the fracture groove 08 and has irreversibility, the manufacturer can determine whether the product has been disassembled by whether the fracture groove 08 is fractured, so as to judge whether the product warranty has expired.

[0042] In an alternative embodiment, the bottom of the fracture groove 08 extends towards the central axis of the small-diameter end 05. Specifically, the fracture groove 08 is provided on the outer surface of the small-diameter end 05, and the bottom of the fracture groove 08 is recessed towards the central axis of the small-diameter end. The recess depth and the opening width of the fracture groove 08 can be adjusted according to specific application requirements.

[0043] Further, please continue to refer to Figure 3 , the cross-section of the fracture groove 08 parallel to the central axis of the small-diameter end is in a "V" shape or a "U" shape or a "W" shape. By setting the cross-section of the fracture groove 08 to the above several shapes, it can be ensured that the small-diameter end 05 and the large-diameter end 07 are disconnected at the fracture groove 08, and the disconnection is irrecoverable, thereby further reducing the problem of counterfeiting.

[0044] In an alternative embodiment, an internal hexagonal groove or a slotted screwdriver groove or a Phillips head groove is provided at the end of the large-diameter end 07. After the double-headed stepped bolt 02 is disconnected at the fracture groove 08, in order to remove the large-diameter end 07 from the product inner plate 10, an internal hexagonal groove or a slotted screwdriver groove or a Phillips head groove is provided on the end (end face) of the large-diameter end 07. The large-diameter end 07 can be screwed out from the inside of the product inner plate 10 (the side facing away from the product outer plate 09) by a tool such as a screwdriver.

[0045] The effect of disconnecting the double-headed stepped bolt 02 at the fracture groove 08 can be achieved in the following ways:

[0046] Embodiment 1:

[0047] A thread sealant is provided between the large-diameter end 07 and the product inner plate 10. The thread sealant is used to fix the large-diameter end 07 in the product inner plate 10. In this embodiment, by providing the thread sealant, when the large-diameter end 07 is screwed into the product inner plate 10, the large-diameter end 07 can be fixed in the product inner plate 10. Thus, when the bolt head 01 is rotated externally, the large-diameter end 07 does not rotate accordingly. Therefore, the moving distance of the small-diameter end 05 is different from the moving distance of the bolt head 01, and the small-diameter end 05 is disconnected from the fracture groove 08 to achieve product anti-disassembly.

[0048] The thread sealant is also called anaerobic adhesive or thread locking agent, which is a special chemical adhesive mainly used for locking and sealing threaded connections. It can quickly cure under anaerobic (i.e., air-insulated) conditions to form a strong bonding effect, firmly connecting the large-diameter end 07 and the product inner plate 10 together.

[0049] During actual use, after assembling the double-headed stepped bolt 02 with the bolt head 01, thread sealant is dropped / applied onto the second internal thread 14 of the product inner panel 10. Then, the double-headed stepped bolt 02 and the bolt head 01 are screwed into the product inner panel 10 from the product outer panel 09 together. When the large-diameter end 07 is screwed into the product inner panel 10 and remains relatively stationary, the thread sealant solidifies to fix the large-diameter end 07 in the product inner panel 10. Thus, when the bolt head 01 is unscrewed from the product outer panel 09, the large-diameter end 07 remains stationary, causing relative movement between the small-diameter end 05 and the bolt head 01, thereby breaking the fracture groove 08.

[0050] Please continue to refer to Figure 4 , in an implementable manner of this embodiment, a glue storage groove 11 is provided at the thread of the large-diameter end 07 (the third external thread 16). The glue storage groove 11 is filled with thread sealant, and the notch of the glue storage groove 11 is sealed by a thin film 12. The thin film 12 is controllably tearable. During the process of screwing the large-diameter end 07 into the product inner panel 10, due to the friction between the threads, the thin film 12 is scratched, so that the thread sealant flows out from the glue storage groove 11, thereby fixing the large-diameter end 07 and the product inner panel 10 to each other. To facilitate scratching the thin film 12, small spikes can be provided at specific positions of the thread of the product inner panel 10, which can scratch the thin film 12 without affecting the screwing-in of the large-diameter end 07.

[0051] It should be noted that before the thin film 12 is scratched, the thread sealant has a certain activity and remains in a fluid state, and can be cured when it comes into contact with the threads.

[0052] In addition, for the structure of the glue storage groove 11, in another implementable embodiment, the glue storage groove 11 can be provided on the second internal thread 14 of the product inner panel 10, and small spikes can be provided on the third external thread 16 of the large-diameter end 07.

[0053] Embodiment 2:

[0054] A screw hole matching the bolt head 01 is provided on the product outer panel 09, and the diameter of the large-diameter end 07 is smaller than the inner diameter of the screw hole. Both the product outer panel 09 and the product inner panel 10 are provided with screw holes, and their positions are aligned; the screw hole on the product outer panel 09 matches the bolt head 01, that is, the bolt head 01 can be screwed into the screw hole, and the screw hole on the product inner panel 10 matches the size of the large-diameter end 07, and the large-diameter end 07 can be screwed into the product inner panel 10. The diameter of the large-diameter end 07 is set to be smaller than the inner diameter of the screw hole on the product outer panel 09, that is, the diameter of the large-diameter end 07 is smaller than the diameter of the bolt head 01. During the assembly process, after the double-headed stepped bolt 02 and the bolt head 01 are assembled together, they can be screwed into the product inner panel 10 from the product outer panel 09 together.

[0055] Please continue to refer to Figure 5, in this embodiment, to further increase the force exerted on the fracture groove 08 when the bolt head 01 is unscrewed, an anti-rotation structure 13 is provided on the end face of the small-diameter end 05, and a corresponding limiting structure is provided on the bottom surface of the connection hole. The anti-rotation structure 13 cooperates with the limiting structure to prevent the small-diameter end 05 from withdrawing from the connection hole. The anti-rotation structure 13 is a one-way structure, that is, it can rotate in one direction and is restricted from rotating in the opposite direction. During the process of screwing the small-diameter end 05 into the connection hole, it can rotate. When the connection hole is unscrewed from the small-diameter end 05, the limiting structure catches the anti-rotation structure 13, so that there is no relative rotation between the anti-rotation structure 13 and the small-diameter end 05 and the connection hole. On the premise that the large-diameter end 07 is fixed and does not rotate in the product inner plate 10, the force of rotating the bolt head 01 is directly applied to the fracture groove 08, causing the fracture groove 08 to break.

[0056] Embodiment Three:

[0057] A retractable one-way buckle 15 is provided on the second internal thread 14 of the product inner plate 10, and a bump is provided on the third external thread 16 of the large-diameter end 07. The one-way buckle 15 cooperates with the bump to prevent the large-diameter end 07 from withdrawing from the direction of the product outer plate 09. The one-way buckle 15 can be retracted into the product inner plate 10. When the large-diameter end 07 is screwed into the product inner plate 10, the bump on the third external thread 16 squeezes the one-way buckle 15, causing the one-way buckle 15 to retract into the product inner plate 10. When there is no bump, the one-way buckle 15 pops out on the second internal thread 14, thereby restricting the backward movement of the bump, that is, restricting the large-diameter end 07 from being unscrewed from the direction of the product outer plate 09. Therefore, according to the principle that the moving distance of the small-diameter end 05 is different from the moving distance of the bolt head 01, the fracture groove 08 is broken, thereby realizing product anti-disassembly. For details, refer to Figure 5 , Figure 5 The arrow direction in

[0058] Once the large-diameter end 07 is completely screwed in and all the provided bumps have passed the position of the one-way buckle 15, at this time, after the one-way buckle 15 loses the squeezing effect of the bump, due to its own elastic restoring force, it quickly pops out on the second internal thread 14. Thereby effectively preventing the backward movement of the bump, that is, preventing the large-diameter end 07 from withdrawing from the direction of the product outer plate 09.

[0059] In an optional embodiment, there is an engagement relationship between the third external thread 16 of the large-diameter end 07 and the third internal thread of the product outer plate 09. The pitch of the third external thread 16 is smaller than the pitch of the third internal thread; or, the pitch of the third external thread 16 is larger than the pitch of the third internal thread. The engagement relationship means that the third external thread 16 and the third internal thread are in contact with each other. In this embodiment, the apertures of the screw holes between the product outer plate 09 and the product inner plate 10 are the same. The pitch of the third internal thread on the product outer plate 09 matches the pitch of the first external thread 04, and the pitch of the second internal thread 14 on the product inner plate 10 matches the pitch of the third external thread 16. During the process of unscrewing the bolt head 01, since the pitch of the third internal thread on the product outer plate 09 is larger / smaller than the pitch of the third external thread 16 of the large-diameter end 07, the large-diameter end 07 cannot pass through the product outer plate 09 and is restricted within the product inner plate 10, or is partially stuck in the third internal thread when being unscrewed. Thus, based on the principle that the moving distance of the small-diameter end 05 is different from the moving distance of the bolt head 01, the fracture groove 08 is disconnected, thereby realizing product anti-disassembly.

[0060] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anti-disassembly fastening structure for fixing an outer panel of a product to an inner panel of the product, characterized in that, Comprising: A bolt head and a double-headed stepped bolt; the bolt head is provided with a connection hole, a first internal thread is arranged in the connection hole, the bolt head is further provided with a first external thread, and the pitch of the first external thread is greater than the pitch of the first internal thread; the small-diameter end of the stepped double-headed thread is provided with a second external thread, and the second external thread is matched with the first internal thread for fixing the small-diameter end in the connection hole. A fracture groove is arranged between the large-diameter end and the small-diameter end of the double-headed stepped bolt, and the fracture groove is used for breaking when the bolt head is screwed out from the outer plate of the product.

2. The anti-disassembly fastening structure according to claim 1, wherein A thread sealant is arranged between the large-diameter end and the inner plate of the product, and the thread sealant is used for fixing the large-diameter end in the inner plate of the product.

3. The anti-disassembly fastening structure according to claim 2, wherein, A glue storage groove is arranged at the thread of the large-diameter end, the glue storage groove is filled with thread sealant, the notch of the glue storage groove is sealed by a film, and the film can be torn controllably.

4. The anti-disassembly fastening structure according to claim 1, wherein, A screw hole matching the bolt head is arranged on the outer plate of the product, and the diameter of the large-diameter end is smaller than the inner diameter of the screw hole.

5. The anti-disassembly fastening structure according to claim 4, wherein An anti-loosening structure is arranged on the end face of the small-diameter end, and a limiting structure is arranged on the bottom surface of the connection hole. The anti-loosening structure and the limiting structure are matched to prevent the small-diameter end from withdrawing from the connection hole.

6. The anti-disassembly fastening structure according to claim 1, wherein, A telescopic one-way buckle is arranged on the second internal thread of the inner plate of the product, and a bump is arranged on the third external thread of the large-diameter end. The one-way buckle and the bump are matched to prevent the large-diameter end from withdrawing from the direction of the outer plate of the product.

7. The anti-disassembly fastening structure according to any one of claims 1 to 6, characterized in that, The bottom of the fracture groove extends towards the central axis direction of the small-diameter end.

8. The anti-disassembly fastening structure according to claim 7, characterized in that, The cross-section of the fracture groove parallel to the central axis is in the shape of "V" or "U" or "W".

9. The anti-disassembly fastening structure according to any one of claims 1 to 6, characterized in that, The end of the large-diameter end is provided with an internal hexagonal socket or a slotted head or a Phillips head.

10. The anti-disassembly fastening structure according to claim 1, wherein There is an engagement relationship between the third external thread of the large-diameter end and the third internal thread of the outer plate of the product, and the pitch of the third external thread is smaller than the pitch of the third internal thread; Or, The pitch of the third external thread is greater than the pitch of the third internal thread.

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