Thin plate connecting piece

Abstract

The utility model provides a thin plate connecting piece, which relates to the technical field of furniture connecting pieces, and comprises a first connecting piece and a second connecting piece, the first connecting piece is used for being pre-buried in a plate, the first connecting piece comprises a first expansion part, the lower part of the first expansion part is elastic, and a lock cylinder is movably arranged in the first expansion part; the lock cylinder is driven to move towards the lower portion of the first expansion part so that the lower portion of the first expansion part can expand towards the first side face and the second side face of the first expansion part, the first side face is opposite to the second side face, the second connecting piece is used for being embedded into another plate and comprises a rod body, the lower end of the rod body is matched with the lock cylinder, and the expansion sleeve is arranged on the rod body in a sleeving mode. The expansion sleeve can expand by rotating the rod body. The installation stability of the thin plate can be improved.

Description

Technical Field

[0001] This utility model relates to the field of furniture hardware technology, and in particular to a concealed thin-plate connector. Background Technology

[0002] A connector is a connecting mechanism used in furniture. It is used to assemble the finished product by installing and locking it onto the pre-processed furniture substrate. Furniture on the market generally uses "three-in-one connectors" or "four-in-one connectors" to connect the panels. However, these methods leave visible holes (eccentric wheels) in the furniture, making the connectors partially or completely visible after assembly. This reduces the overall aesthetics and durability of the furniture, and limits its design flexibility and design possibilities.

[0003] Furniture production and sales are gradually trending towards a front-end sales, back-end manufacturing model. The factory processes the panels, which are then transported to the end consumer for assembly. In this model, economy and convenience are crucial factors to consider both the production and installation processes. Currently, furniture on the market uses "three-in-one connectors" to join panels, which cannot be pre-installed in the factory and must be tightened with screws on-site. This easily leads to problems such as missing, incorrectly installed, or damaged hardware. Since the installation site is often far from the factory, these issues result in very high after-sales costs. Furthermore, the cumbersome on-site installation significantly increases labor costs and can lead to a poor delivery experience for the end consumer.

[0004] Post-production furniture transportation is a crucial part of the delivery service. Using pre-assembled "three-in-one connectors" prevents the flat packaging of panels during transport, increasing transportation costs and the probability of panel damage. This hinders the establishment of the furniture factory's delivery system and is detrimental to improving production efficiency.

[0005] With the widespread adoption of online shopping and efficient furniture sales methods like IKEA, easy packaging, tool-free assembly, and standardized installation of furniture are becoming increasingly important. Traditional three-in-one connectors require a more cumbersome process, more tools, and more steps, which limits their effectiveness in this sales model. The industry trend demands a convenient, robust, tool-free, and quick-assembly connector product.

[0006] The current trend of furniture customization is sweeping the industry, and non-standard size customization and non-standard product production are bringing greater processing difficulties to furniture manufacturers. The process of assembling cabinets using traditional "three-in-one connectors" requires high precision in hole machining and panel dimensional accuracy. Errors can easily lead to uneven panel placement after cabinet assembly.

[0007] Furniture products often encounter special situations such as after-sales repairs after delivery to the end consumer. Furniture using "three-in-one connectors" to join panels requires disassembling the entire cabinet. In residential environments, cumbersome after-sales service can easily lead to dissatisfaction among end consumers. Therefore, the need for connectors that allow for the removal of individual panels is becoming increasingly important.

[0008] Furthermore, furniture or cabinets assembled and delivered using "three-in-one connectors" often experience loosening of the internal cam lock components after prolonged use, sometimes even detaching from the pre-drilled holes in the panels. This can cause the cabinet structure to become loose and wobbly. Such problems require frequent re-tightening of the cam locks, making furniture maintenance cumbersome and burdensome.

[0009] Thin sheets are widely used due to their lightweight, cost advantages, and ease of transportation, but their joining technology still faces significant challenges. Since mounting holes are primarily located at the edges of the sheet, most connections use non-expansion connectors to prevent edge cracking due to expansion. However, this also leads to less stable installations. Utility Model Content

[0010] To address the problem of insufficient stability in the installation of thin plates in existing technologies, this utility model provides a thin plate connector that can improve the installation stability of thin plates.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A thin-plate connector, comprising:

[0013] A first connector is used to be embedded in a plate. The first connector includes a first expansion part. The lower part of the first expansion part is elastic. A lock cylinder is movably disposed in the first expansion part. The lock cylinder is driven to move towards the lower part of the first expansion part so that the lower part of the first expansion part expands towards its first side and second side, with the first side and the second side opposite to each other.

[0014] The second connector is embedded in the second plate. The second connector includes a rod and an expansion sleeve. The lower end of the rod is adapted to the lock cylinder. The expansion sleeve is sleeved on the rod. Rotating the rod can cause the expansion sleeve to expand.

[0015] As described above, the thin plate connector further includes a first internal thread in the first expansion portion, a first external thread on the outer surface of the lock core, the first internal thread being threadedly connected to the first external thread, a first inclined portion in the lower part of the first expansion portion, the first inclined portion being downward and inclined toward the central axis of the first expansion portion, and the first inclined portion being respectively disposed on the first side and the second side.

[0016] As described above, the thin plate connector further includes a first inclined surface and a second inclined surface, wherein the first inclined surface is disposed on the back side of the first side surface and the second inclined surface is disposed on the back side of the second side surface.

[0017] In one state, when the lock cylinder is screwed into the thread on the first expansion part, the first inclined surface and the second inclined surface are subjected to a vertically downward compressive force, causing the first side surface and the second side surface to expand outward.

[0018] As described above, the first connector further includes a guide portion having a slot and a groove. The slot is adapted to the lower end of the rod. The side wall of the lock cylinder has a notch, and the slot and the notch are connected by the groove.

[0019] As described above, the first connector further includes an expansion sleeve fitted onto the rod body. The expansion sleeve has a second expansion portion and a connecting portion. The connecting portion has a second internal thread. The outer surface of the rod body has a second external thread. The second internal thread and the second external thread are threadedly connected. The second expansion portion is elastic. The second expansion portion is connected to the connecting portion and is positioned above the connecting portion. The second expansion portion has a second inclined portion inside. The second inclined portion is upward and inclined toward the central axis of the second expansion portion.

[0020] In the thin plate connector described above, the outer surface of the connector is further provided with convex strips at equal intervals, and the convex strips extend along the height direction of the connector.

[0021] As described above, the thin plate connector further includes two first protrusions on the upper surface of the first expansion portion. The two first protrusions are arc-shaped and elastic, and are horizontally oriented towards the slot. The distance between the two first protrusions is less than the diameter of the rod.

[0022] As described above, in the thin plate connector, the first expansion portion is flush with the upper and lower surfaces of the guide portion, and the lower part of the guide portion is elastic and connected to the second side surface.

[0023] As described above, the thin plate connector further includes a first cylindrical portion, a hexagonal prism portion, a second cylindrical portion, and a rod head, wherein the rod head is hexagonal prism shaped.

[0024] The lock cylinder has an inwardly protruding second boss and a third boss, with the second boss above the third boss, and a first opening and a second opening are provided between the guide portion and the first expansion portion.

[0025] When the rod slides toward the lock cylinder in the groove, the first cylindrical part will be adapted to and squeezed by the second boss, the hexagonal prism part will be adapted to and squeezed by the first opening, the second cylindrical part will be attached to the third boss and squeezed and locked by the third boss, and the rod head will be adapted to and squeezed by the second opening.

[0026] As described above, the thin plate connector further includes reverse teeth on both the first and second sides.

[0027] Compared with the prior art, the advantages of this utility model are as follows:

[0028] 1. The first expansion part of this utility model can improve the stability of the installation by expansion, and realizes that the accessory only expands in the horizontal direction and does not expand in the vertical direction, and does not cause the edge of the plate to crack. This ensures that the thin plate substrate is not strong enough to support the expansion part during the installation of the accessory, and the accessory does not expand, thus avoiding damage to the plate.

[0029] 2. After the two plates are installed, the first and second connectors of this utility model will not be exposed and the mounting holes will not be visible, achieving the effect of completely concealing the connectors and mounting holes and improving the overall aesthetics. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the thin plate connector in an embodiment of the present utility model;

[0032] Figure 2 This is an exploded view of the structure of the first connector in this embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the first connecting member in an embodiment of this utility model;

[0034] Figure 4 This is a top view of the first connecting member in an embodiment of this utility model;

[0035] Figure 5 for Figure 4 Cross-sectional view at point AA;

[0036] Figure 6 This is an exploded view of the structure of the second connector in this embodiment of the present invention;

[0037] Figure 7 This is a right view of the expansion sleeve in an embodiment of this utility model;

[0038] Figure 8 for Figure 7 Cross-sectional view at point BB;

[0039] Figures 9 to 10 This is a schematic diagram of the expansion of the first connecting member in an embodiment of this utility model;

[0040] Figure 11 for Figure 9 Cross-sectional view;

[0041] Figure 12 for Figure 10 Cross-sectional view;

[0042] Figures 13 to 14 This is a schematic diagram of the expansion of the second connector in an embodiment of this utility model;

[0043] Figure 15 for Figure 13 The main view;

[0044] Figure 16 for Figure 14 Cross-sectional view;

[0045] Figures 17 to 19 This is a schematic diagram of the installation of the first connector and the second connector in an embodiment of this utility model;

[0046] Figure 20 for Figure 17 Cross-sectional view;

[0047] Figure 21 for Figure 18 Cross-sectional view;

[0048] Figure 22 for Figure 19 Cross-sectional view;

[0049] Figures 23 to 25 This is an installation diagram of the first plate and the second plate in an embodiment of this utility model;

[0050] In the diagram: 1. First connector; 2. Second connector; 3. First expansion part; 4. Guide part; 5. Lock cylinder; 6. Rod body; 7. Expansion sleeve; 8. First side; 9. Second side; 10. First inclined part; 11. First inclined surface; 12. Groove; 13. Slide groove; 14. Notch; 15. Second expansion part; 16. Connecting part; 17. First internal thread; 18. First external thread; 19. Second inclined part; 20. Raised bar; 21. First boss; 22. Rod head; 23. Second internal thread; 24. Second external thread; 25. Second inclined surface; 26. First cylindrical part; 27. Hexagonal prism part; 28. Second cylindrical part; 29. ​​Second boss; 30. Third boss; 31. First opening; 32. Second opening; 33. Back teeth; 34. First plate; 35. Second plate. Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0052] Example:

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this utility model are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0054] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" 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.

[0056] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] This utility model provides a technical solution: a thin plate connector, which includes a first connector 1 and a second connector 2. The first connector 1 is used to be embedded in a plate. The first connector 1 includes a first expansion part 3. The lower part of the first expansion part 3 is elastic. A lock cylinder 5 is movably disposed in the first expansion part 3. Driving the lock cylinder 5 to move towards the lower part of the first expansion part 3 causes the lower part of the first expansion part 3 to expand towards its first side 8 and second side 9. The first side 8 and the second side 9 are opposite to each other. The second connector 2 is used to be embedded in another plate. The second connector includes a rod 6 and an expansion sleeve 7. The lower end of the rod 6 is adapted to the lock cylinder 5. The expansion sleeve 7 is sleeved on the rod 6. Rotating the rod 6 can cause the expansion sleeve 7 to expand. The lower end of the rod 6 is adapted to the lock cylinder 5.

[0058] Specifically, see Figures 1 to 22The first connector 1 and the second connector 2 are respectively installed in the two panels (first panel 34 and second panel 35) that need to be spliced. Both connectors are pre-expanded. Since the mounting hole of the first panel 34 where the first connector 1 is installed is generally located at the edge of the panel, and given the relatively small thickness of the thin panel, after the first connector 1 is installed into the mounting hole of the first panel 34, the lock cylinder 5 is moved downwards towards the lower part of the first expansion part 3 using a screwdriver or other locking tool, causing the lower part of the first expansion part 3 to expand. However, the first expansion part 3 only expands to its two sides (first side 8 and second side 9), that is, along the length of the panel, thus avoiding expansion in the width direction that could cause the edge of the panel to crack. Similarly, after the second connector 2 is installed into the mounting hole of the second panel 35, the rod is rotated using a screwdriver or other locking tool, causing the expansion sleeve to expand. Thus, compared to other non-expanding furniture connectors, this first connector 1 increases the frictional resistance with the wall of the mounting hole through expansion, making the connection tighter and the load-bearing capacity stronger, thereby providing greater stability within the mounting hole. Meanwhile, compared to other expandable furniture connectors, this design ensures the integrity of the board by not expanding towards the edge. It should be noted that within the first expansion section 3, the portion other than the first side 8 and the second side 9 does not expand.

[0059] As an optional implementation, in some embodiments, the first expansion portion 3 has a first internal thread 17, the outer surface of the lock cylinder 5 has a first external thread 18, the first internal thread 17 and the first external thread 18 are threadedly connected, the lower part of the first expansion portion 3 has a first inclined portion 10, the first inclined portion 10 is downward and inclined toward the central axis of the first expansion portion 3, and the first inclined portion 10 is respectively disposed on the first side surface 8 and the second side surface 9. See again... Figures 2 to 5 The lock cylinder 5 is connected to the first expansion part 3 by a threaded connection, so that the lock cylinder 5 can be moved by a screwdriver or other locking tool. The first side 8 and the second side 9 of the lower part of the first expansion part 3 have a first inclined part 10. When the lock cylinder 5 moves to the inwardly inclined first inclined part 10, it can push the first side 8 and the second side 9 outward, thereby achieving the expansion effect.

[0060] In the above embodiment, the first inclined portion further includes a first inclined surface 11 and a second inclined surface 25. The first inclined surface 11 is disposed on the back side of the first side surface 7, and the second inclined surface 25 is disposed on the back side of the second side surface 9. In one state, when the lock cylinder 5 is screwed into the thread on the first expansion portion 3, the first inclined surface 11 and the second inclined surface 25 are subjected to a vertically downward compressive force, causing the first side surface 8 and the second side surface 9 to expand outward. See again... Figure 3 and Figure 4When the first external thread on the lock cylinder is screwed into the first internal thread on the expansion part, the first and second inclined surfaces are subjected to a vertically downward compressive force, causing the first and second side surfaces to expand outward. The first expansion part 3 does not have an inclined surface in the direction perpendicular to the first side surface 8 and the second side surface 9, so that when the lock cylinder 5 is screwed in, the first expansion part 3 only expands in the horizontal direction. When applied to ultra-thin plates with low strength, it can ensure expansion and maintain the stability of the accessory installation while avoiding excessive compression deformation and damage to the plate.

[0061] As an optional implementation, in some embodiments, the first connecting member 1 further includes a guide portion 4, which has a slot 12 and a groove 13. The slot 12 is adapted to the lower end of the rod body 6, and the side wall of the lock cylinder 5 has a notch 14. The slot 12 and the notch 14 are connected by the groove 13. See again... Figure 2 During the connection process of the first connector 1 and the second connector 2, the rod 6 is accurately and smoothly inserted into the lock cylinder 5 through the slide groove 13 of the guide part 4, which can avoid misalignment or jamming and achieve the effect of quick installation.

[0062] As an optional implementation, in some embodiments, the expansion sleeve 7 has a second expansion portion 15 and a connecting portion 16. The connecting portion 16 has a second internal thread 23, and the outer surface of the rod 6 has a second external thread 24. The second internal thread 23 and the second external thread 24 are threadedly connected. The second expansion portion 15 is elastic, connected to the connecting portion 16, and disposed above the connecting portion 16. The second expansion portion 15 has a second inclined portion 19, which is upward and inclined toward the central axis of the second expansion portion 15. See again... Figures 6 to 8 The expansion sleeve 7 is connected to the rod 6 by a threaded connection, so the rod 6 can be moved by a screwdriver or other tightening tool. The second expansion part 15 has a second inclined part 19. When the upper end of the rod 6 moves to the inwardly inclined second inclined part 19, the second expansion part 15 can be pushed outward, thereby achieving the expansion effect.

[0063] In the above embodiment, further, the outer surface of the connecting portion 16 is provided with equally spaced protrusions 20, which extend along the height direction of the connecting portion 16. See also... Figure 6 and Figure 7 When the protrusion 20 contacts the wall of the mounting hole, it forms multi-point frictional resistance, which restricts the expansion sleeve 7 from sliding axially and further increases the stability of the second connector 2 in the mounting hole.

[0064] As an optional implementation, in some embodiments, the upper surface of the first expansion portion is provided with two first protrusions. The two first protrusions are arc-shaped and elastic, and are horizontally oriented towards the slot. The distance between the two first protrusions 21 is less than the diameter of the rod 6. See again... Figure 4 The distance between the two first protrusions 21 is slightly smaller than the diameter of the lower end of the rod 6. Since both first protrusions 21 are elastic, when the lower end of the rod 6 slides between them, the external force causes elastic deformation of the two protrusions 21, allowing the lower end of the rod 6 to pass through. On the other hand, after the lower end of the rod 6 passes between the two protrusions 21, they return to their original state, forming a narrow channel behind the lower end of the rod 6. Without a certain degree of external force, the lower end of the rod 6 cannot return on its own, thus preventing children from accidentally disassembling the plate and increasing the stability of the installation.

[0065] As an optional implementation, in some embodiments, the first expansion portion 3 is flush with the upper and lower surfaces of the guide portion 4, and the lower part of the guide portion 4 is elastic and connected to the second side surface 9. See again... Figure 2 and Figure 3 The guide part 4 is located on the second side 9 of the first expansion part 3. Since the first connector 1 needs to expand in both directions of the first side 8 and the second side 9, the lower part of the guide part 4 is elastic, so that when the second side 9 is stretched outward, the guide part 4 can also be forced to expand outward.

[0066] As an optional implementation, in some embodiments, the rod body includes a first cylindrical portion 26, a hexagonal prism portion 27, a second cylindrical portion 28, and a rod head 22. The rod head 22 is hexagonal prism shaped. The lock cylinder 5 has an inwardly protruding second boss 29 and a third boss 30. The second boss 29 is above the third boss 30. A first opening 31 and a second opening 32 are provided between the guide portion 4 and the first expansion portion 3. When the rod body 6 slides towards the lock cylinder 5 in the slide groove 13, the first cylindrical portion 26 will be mutually adapted and pressed against the second boss 29, the hexagonal prism portion 27 will be mutually adapted and pressed against the first opening 31, the second cylindrical portion 28 will be mutually attached to the third boss 30 and be pressed and locked by the third boss 30, and the rod head 22 will be mutually adapted and pressed against the second opening 32.

[0067] Specifically, see again Figure 5 and Figure 6The rod body 6 is divided into four parts. The rod body 6 has a first cylindrical portion, which is fitted and pressed against the second boss inside the first connecting member 1, and its diameter is the same as the rod body 6. Below this is a hexagonal prism portion 27, which is fitted and pressed against the first opening 31 inside the first connecting member 1, and its diameter is the same as the rod body 6. Further down is a second cylindrical portion 28, which is fitted and pressed against the third boss 30 inside the first connecting member 1, and its diameter is smaller than that of the rod body 6 and the other parts of the second connecting member 2. At the bottom is a hexagonal prism-shaped rod head 22, which is fitted and pressed against the second opening 32 inside the first connecting member 1. As can be seen from the cross-sectional view of the first connecting member 1 and the second connecting member 2, when the rod body 6 is locked inside the first connecting member 1, the contours of the two parts are perfectly fitted, forming an I-shape that wraps around and presses against each other, increasing the contact area and locking force between the rod body 6 and the interior of the first connecting member 1, providing higher strength. In addition, the hexagonal prism shape can be used with common wrenches (such as open-end wrenches and box wrenches) and power tools (such as drill sockets), allowing for easy installation or removal without the need for special tools.

[0068] As an optional implementation, in some embodiments, both the first side surface 8 and the second side surface 9 are provided with reverse teeth 33. See again Figure 5 This can further increase the friction between it and the inner wall of the substrate.

[0069] Installation and usage instructions for this thin-plate connector: See [link / reference] Figures 23 to 25 First, pre-drill mounting holes in the two plates to be installed. Then, install the first and second connectors into their corresponding mounting holes. Next, expand the first and second connectors separately (first connector: use a bolt cutter to rotate the lock cylinder, causing it to move towards the lower part of the first expansion section, thus opening the opposing first and second sides; second connector: use a wrench to rotate the lower end of the rod, causing the upper end of the rod to move towards the second expansion section, thus opening the second expansion section). After expansion, the lower end of the second connector's rod will be exposed. Finally, insert the exposed part into the groove of the first connector and apply force to slide the rod end along the groove until the two plates are aligned. At this point, the rod end will be locked and fixed at the lock cylinder. As can be clearly seen from the diagram, using this thin-plate connector to install the two plates, the first and second connectors will not be exposed after installation, and the mounting holes of the two plates will also be invisible, achieving a completely invisible effect for the connectors and mounting holes, greatly improving the overall aesthetics.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A thin plate connector, characterized in that, include: A first connector is used to be embedded in a first plate. The first connector includes a first expansion part. The lower part of the first expansion part is elastic. A lock cylinder is movably disposed in the first expansion part. The lock cylinder is driven to move towards the lower part of the first expansion part so that the lower part of the first expansion part expands towards its first side and second side, with the first side and the second side opposite to each other. The second connector is embedded in the second plate. The second connector includes a rod and an expansion sleeve. The lower end of the rod is adapted to the lock cylinder. The expansion sleeve is sleeved on the rod. Rotating the rod can cause the expansion sleeve to expand.

2. The thin plate connector according to claim 1, characterized in that, The first expansion portion has a first internal thread, and the outer surface of the lock core has a first external thread. The first internal thread and the first external thread are threadedly connected. The lower part of the first expansion portion has a first inclined portion. The first inclined portion is downward and inclined toward the central axis of the first expansion portion. The first inclined portion is respectively disposed on the first side and the second side.

3. The thin plate connector according to claim 2, characterized in that, The first inclined portion includes a first inclined surface and a second inclined surface, the first inclined surface being disposed on the back side of the first side surface, and the second inclined surface being disposed on the back side of the second side surface; In one state, when the lock cylinder is screwed into the thread on the first expansion part, the first inclined surface and the second inclined surface are subjected to a vertically downward compressive force, causing the first side surface and the second side surface to expand outward.

4. The thin plate connector according to claim 1, characterized in that, The first connector further includes a guide portion having a slot and a groove. The slot is adapted to the lower end of the rod body. The side wall of the lock cylinder has a notch, and the slot and the notch are connected by the groove.

5. The thin-plate connector according to claim 1, characterized in that, The expansion sleeve has a second expansion portion and a connecting portion. The connecting portion has a second internal thread, and the outer surface of the rod has a second external thread. The second internal thread and the second external thread are threadedly connected. The second expansion portion is elastic. The second expansion portion is connected to the connecting portion and is disposed above the connecting portion. The second expansion portion has a second inclined portion inside. The second inclined portion is upward and inclined toward the central axis of the second expansion portion.

6. The thin-plate connector according to claim 5, characterized in that, The outer surface of the connecting part is provided with convex strips at equal intervals, and the convex strips extend along the height direction of the connecting part.

7. The thin plate connector according to claim 4, characterized in that, The upper surface of the first expansion part is provided with two first protrusions. The two first protrusions are arc-shaped and elastic. The two first protrusions are horizontally oriented towards the slot. The distance between the two first protrusions is less than the diameter of the rod.

8. The thin plate connector according to claim 4, characterized in that, The first expansion portion is flush with the upper and lower surfaces of the guide portion, and the lower part of the guide portion is elastic and connected to the second side surface.

9. The thin plate connector according to claim 4, characterized in that, The rod body includes a first cylindrical part, a hexagonal prism part, a second cylindrical part, and a rod head, wherein the rod head is hexagonal prism shaped; The lock cylinder has an inwardly protruding second boss and a third boss, with the second boss above the third boss, and a first opening and a second opening are provided between the guide portion and the first expansion portion. When the rod slides toward the lock cylinder in the groove, the first cylindrical part will be adapted to and squeezed by the second boss, the hexagonal prism part will be adapted to and squeezed by the first opening, the second cylindrical part will be attached to the third boss and squeezed and locked by the third boss, and the rod head will be adapted to and squeezed by the second opening.

10. The thin-plate connector according to claim 1, characterized in that, Both the first side and the second side are provided with reverse teeth.

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