concealed connector

Abstract

The application provides a hidden connector, and relates to the technical field of furniture fittings. The hidden connector comprises a hidden male part and a hidden female part. The hidden male part is fixed to a fixed side of a first plate part, and the hidden female part is fixed to a hidden hole on one side of a second plate part and is detachably connected with the hidden male part inserted into the hidden hole. At least one side of the hidden male part is provided with a positioning part for limiting the installation orientation of the hidden male part. The hidden female part can be installed in the hidden hole, the influence of the lamp wire groove slotting is reduced, the decoration effect is improved, the influence on illumination is reduced, the installation orientation of the hidden male part is limited by the positioning part in the hidden male part, the correct installation of the hidden male part and the hidden female part is effectively ensured, the problem of repeated installation due to installation failure is avoided, the furniture production efficiency is improved, the plate part damage is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of furniture fittings technology, and more specifically, to a concealed connector. Background Technology

[0002] Furniture is composed of multiple interconnected panels. To ensure a stable connection between these panels, connectors are often used. However, existing connectors are exposed, which not only affects the aesthetics of the furniture but also makes them susceptible to damage from external impacts, affecting the stability of the panel connection.

[0003] To address this issue, concealed connectors are commonly used to connect panels. These connectors typically consist of two or more components assembled together, with the panels linked through the connection of these components. To ensure effective panel connection, these components need to be mounted on the panel surface and connected in a specific manner. However, these components have multiple mounting orientations, and to conceal wiring, the wiring in the light fixture troughs overlaps with the mounting positions of these components. Therefore, the connectors interfere with the placement of the light fixture troughs, and during installation, incorrect orientation (such as installing components upside down or in the wrong position) can easily prevent the connection from being made in the specified manner, leading to installation failure, reduced furniture production efficiency, increased risk of damaging the panels, and higher production costs. Utility Model Content

[0004] This application provides a hidden connector that can solve the problems of existing connectors interfering with the slotting of the lamp wire groove, affecting lighting, and easily causing installation failure due to incorrect installation orientation, thus reducing furniture production efficiency and damaging the board.

[0005] To achieve this objective, the embodiments of this application provide the following solutions.

[0006] According to one aspect of the embodiments of this application, a hidden connector is provided, including a hidden sub-component and a hidden female component. The hidden sub-component is fixed to the fixed side of a first plate, and the hidden female component is fixed in a hidden hole on one side of a second plate and is detachably connected to the hidden sub-component inserted into the hidden hole. At least one side of the hidden sub-component is provided with a positioning element for defining the installation orientation of the hidden sub-component.

[0007] In one possible implementation, the positioning element includes a positioning protrusion located on the side of the hidden sub-component closer to the first plate, and one end of the mounting hole of the hidden sub-component and the positioning protrusion are located on the same side of the hidden sub-component. The first plate has a positioning hole corresponding to the positioning protrusion, and the positioning protrusion is fixed to the positioning hole.

[0008] In one possible implementation, the hidden sub-component includes a front sub-component, and the hidden female component includes a front female component. The front sub-component has a pin on one side, and the front female component has a first fixing hole corresponding to the pin on one side. The pin is used to insert into the first fixing hole to fix the first plate and the second plate.

[0009] In one possible implementation, the positioning element includes a guide platform or guide groove disposed on the front end member, and the front end female member is provided with a corresponding guide groove or guide platform. The guide platform is used to fit against the guide groove when the pin is inserted into the first fixing hole.

[0010] In one possible implementation, the guide platform and the pin are located on the same side of the front terminal member; Alternatively, the guide groove and the pin may be located on the same side of the front terminal component.

[0011] In one possible implementation, the hidden sub-component includes a rear terminal component, and the hidden female component includes a rear end female component, wherein the rear end female component and the front end female component are fixed in different hidden holes; The rear terminal component has a second fixing hole on the side near the rear female component; The rear end female component is provided with a third fixing hole corresponding to the second fixing hole. The third fixing hole penetrates the rear end female component and is opposite to the fourth fixing hole that penetrates the side of the second plate. The screw passes through the fourth fixing hole, the third fixing hole, and extends into the second fixing hole.

[0012] In one possible implementation, the hidden hole includes a first hole and a second hole formed by drilling. The front end piece is fixed in the first hole, and the rear end piece is fixed in the second hole. The shape of the front end piece corresponds to the shape of the first hole, and the shape of the rear end piece corresponds to the shape of the second hole. The second hole is provided with an adjustment space for the rear end piece to move.

[0013] In one possible implementation, the first hole includes two connected first cylindrical holes, the front end piece is fixed in one of the first cylindrical holes, and the side of the front end piece contacts and abuts the inner wall of the first cylindrical hole.

[0014] In one possible implementation, the second plate has a light groove connecting the first hole and the second hole, and there is a height difference between the rear end female component and the front end female component and the depth of the light groove.

[0015] In one possible implementation, the second hole includes three interconnected second cylindrical holes, and the rear end female component includes a first post and a second post. The bottoms of the first post and the second post are connected. The first post abuts against the inner wall of the second cylindrical hole at one end of the second hole, and the side of the second post away from the first post extends into another second cylindrical hole and abuts against the inner wall of the other second cylindrical hole.

[0016] The beneficial effects of the technical solutions provided in this application are: The concealed connector provided in this application includes a concealed sub-component and a concealed female-component. The concealed sub-component is fixed to the fixed side of a first plate, and the concealed female-component is fixed in a concealed hole on one side of a second plate and is detachably connected to the concealed sub-component inserted into the concealed hole. At least one side of the concealed sub-component is provided with a positioning element for defining the installation orientation of the concealed sub-component. This embodiment of the application enables the concealed female-component to be installed in the concealed hole, reducing the impact on the slotting of the light wiring trough, improving the decorative effect and reducing the impact on lighting. Furthermore, the positioning element in the concealed sub-component defines its installation orientation, thereby effectively ensuring the correct installation of the concealed sub-component and the concealed female-component, avoiding the problem of repeated installation due to connection errors, improving furniture production efficiency, reducing plate damage, and lowering production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0018] Figure 1 A structural diagram of the hidden connector provided in the embodiments of this application; Figure 2 Structural diagrams of the first plate, front terminal, and rear terminal provided in the embodiments of this application; Figure 3 A structural diagram of the first plate provided in an embodiment of this application; Figure 4 Structural diagrams of the second board, front-end motherboard, and rear-end motherboard provided in the embodiments of this application; Figure 5 This is a schematic diagram of the lamp wiring trough provided in an embodiment of this application; Figure 6 A side view of the second plate provided in an embodiment of this application; Figure 7 A structural diagram of the front-end terminal provided in the embodiments of this application; Figure 8 A structural diagram of the front-end master component provided in the embodiments of this application; Figure 9 A structural diagram of the back-end master component provided in the embodiments of this application; Figure 10This is a structural diagram of the rear terminal component provided in an embodiment of this application.

[0019] Labeling Explanation: 11. Front terminal component; 111. Pin; 112. Guide groove; 12. Front end female component; 121. First fixing hole; 122. Guide platform; 21. Rear terminal component; 22. Rear end female component; 221. Second fixing hole; 222. Second column; 223. Third column; 224. Base; 225. Third fixing hole; 3. First plate; 31. Positioning hole; 4. Second plate; 41. First hole; 42. Second hole; 43. Light trough; 44. Fourth fixing hole; 5. Positioning protrusion; 6. Mounting hole. Detailed Implementation

[0020] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0021] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this application mean that the corresponding feature can be implemented as the presented feature, information, data, step, operation, element, and / or component, but do not exclude implementation as other features, information, data, step, operation, element, component, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” indicates implementation as “A,” or implementation as “A,” or implementation as “A and B.”

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] The technical solutions of this utility model and their effects are described below through several exemplary embodiments. It should be noted that the following embodiments can be referenced, borrowed from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0024] The concealed connector provided in this application is intended to solve at least one technical problem existing in the prior art.

[0025] This application provides a hidden connector in its embodiments, such as... Figures 1-10 As shown, the hidden connector includes a hidden sub-component and a hidden female component. The hidden sub-component is fixed to the fixed side of the first plate 3, and the hidden female component is fixed in a hidden hole on one side of the second plate 4 and is detachably connected to the hidden sub-component inserted into the hidden hole. At least one side of the hidden sub-component is provided with a positioning element for defining the installation orientation of the hidden sub-component.

[0026] Optionally, the first panel 3 can be a side panel, and the second panel 4 can be a fixed layer in the furniture. After the hidden connector is installed, the fixed layer is perpendicular to the side panel. The hidden sub-component can also be installed on the fixed layer, and the corresponding hidden mother component can be installed on the side panel. The installation method of both can be set according to actual needs.

[0027] Optionally, the concealed sub-component and the concealed mother component can be detachably connected by means of pins, screws, snap-fits, or other methods. Furthermore, the number of concealed connectors can be one or more, and the number can be determined based on parameters such as the stability requirements of the furniture, the type of panel, and its dimensions.

[0028] Optionally, the positioning element includes a positioning protrusion 5 located on the side of the hidden sub-component near the first plate 3, and one end of the mounting hole 6 of the hidden sub-component is located on the same side of the hidden sub-component as the positioning protrusion 5. The first plate 3 has positioning holes 31 corresponding to the positioning protrusion 5 and the mounting hole 6. The positioning protrusion 5 is fixed to one positioning hole 31, and the mounting hole 6 is opposite to another positioning hole 31 on the first plate 3. The direction of the line connecting the two positioning holes 31 corresponds to the installation orientation of the hidden connector. By setting the positioning protrusion 5 and fixing it to the positioning hole 31, the hidden sub-component is limited to a specific orientation and the problem of the hidden sub-component not being able to effectively connect with the hidden mother component due to rotation is avoided.

[0029] Optionally, to facilitate quick installation, positioning holes 31 can be made at predetermined positions on the first plate 3 during the production of the plates, and holes can be drilled at predetermined positions on the second plate 4 to form hidden holes.

[0030] Optionally, the positioning protrusion 5 can be a conical structure, or a cylindrical structure, a prismatic structure, or other shapes. Furthermore, the shape of the corresponding positioning hole 31 on the first plate 3 corresponds to the positioning protrusion 5.

[0031] Optionally, the mounting hole 6 on the concealed sub-component can be a screw hole, and the concealed sub-component can be fixed by screwing a screw into the screw hole. Alternatively, the concealed sub-component can be fixed to the first plate 3 by an expansion screw or a device whose end can engage with the positioning hole 31 on the first plate 3. The concealed mother component can be fixed in the concealed hole of the second plate 4 in the same way as the concealed sub-component (such as by screw fixing).

[0032] In one embodiment, the concealed sub-component has a mounting hole 6 that penetrates through it. The positioning protrusion 5 is a tapered boss located on the side of one end of the mounting hole 6. When installing the concealed sub-component, the side of the concealed sub-component with the positioning protrusion 5 is brought close to the first plate 3, and the positioning protrusion 5 and the mounting hole 6 on the concealed sub-component are aligned with the corresponding positioning holes 31 on the first plate 3. The concealed sub-component is then fixed to the first plate 3 using screws (such as automatic screws) screwed into the mounting holes 6.

[0033] Optionally, the concealed sub-component includes a front sub-component 11, and the concealed female component includes a front female component 12. The front sub-component 11 has a pin 111 on one side, and the front female component 12 has a first fixing hole 121 corresponding to the pin 111 on one side. The pin 111 is inserted into the first fixing hole 121 to fix the first plate 3 and the second plate 4. The relative fixation of the front sub-component 11 and the front female component 12 is achieved by inserting the pin 111 into the first fixing hole 121.

[0034] In one embodiment, the pin 111 may be disposed on the side of the front terminal piece 11, with one end of the pin 111 extending away from the mounting hole 6. The mounting hole 6 may be perpendicular to the pin 111. When the front terminal piece 11 and the front end piece 12 are fixed relative to each other, the front terminal piece 11 and the pin 111 may be located within the hidden hole where the front end piece 12 is located to reduce the gap between the first plate 3 and the second plate 4. The pin 111 may be cylindrical in shape, and the first fixing hole 121 may be a cylindrical slot that matches the pin 111.

[0035] Optionally, to prevent the front terminal component 11 from rotating after being inserted into the front female component 12, or to ensure that the front terminal component 11 is inserted into the front female component 12 in the correct orientation (e.g., with the positioning protrusion 5 facing upwards), a positioning element includes a guide platform 122 or a guide groove 112 provided on the front terminal component 11. The front female component 12 is provided with a corresponding guide groove 112 or guide platform 122. The guide platform 122 is used to fit against the guide groove 112 when the pin 111 is inserted into the first fixing hole 121, thereby playing a role in installation guidance. Through the cooperation of the guide platform 122 and the guide groove 112, the front terminal component 11 is limited to be inserted into the front female component 12 in the correct orientation.

[0036] Optionally, a guide groove 112 can be provided on the front terminal component 11, and a guide platform 122 can be provided on the front female component 12. Alternatively, both the guide platform 122 and the guide groove 112 can be provided on the front terminal component 11 and the front female component 12.

[0037] Optionally, the guide plate 122 and the pin 111 are located on the same side of the front terminal piece 11; or the guide groove 112 and the pin 111 are located on the same side of the front terminal piece 11.

[0038] In one embodiment, a guide groove 112 is disposed at the end of the front terminal member 11 away from the first plate member 3, and is recessed inward to form a groove. A guide platform 122 is disposed at the lower part of the front end member 12, and the top of the guide platform 122 is flush with the first fixing hole 121, and the top is provided with an arc-shaped groove corresponding to the first fixing hole 121. The guide platform 122 extends in a direction away from the front end member 12, and the extension distance of the guide platform 122 corresponds to the depth of the guide groove 112.

[0039] Optionally, the number of fixing mechanisms formed by the front terminal piece 11 and the front female piece 12 can be one or more, and the number can be determined according to the dimensions of the first plate 3 and the second plate 4 and the fixing requirements. When the number of fixing mechanisms is two or more, the first fixing holes 121 of the front female piece 12 can face the same direction, so that when the front terminal piece 11 is inserted into the hidden hole, the pin 111 can be simultaneously inserted into the first fixing hole 121 by pushing the first plate 3 to move.

[0040] Optionally, the concealed sub-component includes a rear sub-component 21, and the concealed female component includes a rear female component 22. The rear female component 22 and the front female component 12 are fixed in different concealed holes. The rear sub-component 21 has a second fixing hole 221 on the side near the rear female component 22. The rear female component 22 has a third fixing hole 225 corresponding to the second fixing hole 221. The third fixing hole 225 penetrates the rear female component 22 and is opposite to a fourth fixing hole 44 penetrating the side of the second plate 4. A screw passes through the fourth fixing hole 44 and the third fixing hole 225 and extends into the second fixing hole 221. The screw can be a self-tapping screw. The fourth fixing hole 44 can be connected at one end to the concealed hole where the rear female component 22 is located, and at the other end to the side of the second plate 4. The screw passing through the fourth fixing hole 44 is used to fix the rear sub-component 21 and the rear female component 22 relative to each other and to adjust the distance between them.

[0041] Optionally, the orientation of the second fixing hole 221 is the same as the orientation of the pin 111 of the front terminal piece 11. In this way, it is ensured that the relative position of the first plate 3 and the second plate 4 can be adjusted by adjusting the distance between the rear terminal piece 21 and the rear female piece 22.

[0042] Optionally, the concealed holes include a first hole 41 and a second hole 42 formed by drilling. The front end female component 12 is fixed in the first hole 41, and the rear end female component 22 is fixed in the second hole 42. The shape of the front end female component 12 corresponds to the shape of the first hole 41, and the shape of the rear end female component 22 corresponds to the shape of the second hole 42. The second hole 42 is provided with an adjustment space for the rear end female component 21 to move, which facilitates the adjustment of the unsightly installation structure caused by the size error of the board. By adjusting the position of the rear end female component 21 in the adjustment space, the position of the first board 3 relative to the second board 4 is adjusted to ensure that the sides of the two can be aligned, thereby making the positions of the first board 3 and the second board 4 adjustable and improving the fault tolerance.

[0043] Optionally, the first hole 41 includes two connected first cylindrical holes, the front end female part 12 is fixed in one of the first cylindrical holes, and the side of the front end female part 12 contacts and abuts the inner wall of the first cylindrical hole.

[0044] Optionally, the front end female part 12 can be fixed in one of the first cylindrical holes, and the guide platform 122 of the front end female part 12 can be located in the connecting area of ​​the two first cylindrical holes and partially extend into the other first cylindrical hole.

[0045] In one embodiment, the front end female component 12 can be a flat structure, the opposite side of which contacts the sidewall of the first cylindrical hole and the side of the front end female component 12 that contacts the first cylindrical hole is arc-shaped so that the front end female component 12 can fit with the first cylindrical hole, thereby defining the position of the front end female component 12 in the hidden hole.

[0046] Optionally, for ease of wiring, a light trough 43 connecting the first hole 41 and the second hole 42 is provided on the second plate 4, such as... Figure 5 As shown, there is a height difference between the rear female component 22 and the front female component 12 and the depth of the lamp groove 43 to prevent interference during wiring. Specifically, the height of the front female component 12 can be lower than the depth of the hidden hole to prevent it from affecting the wires in the lamp groove 43.

[0047] Alternatively, the light trough 43 may not be connected to the first hole 41 and the second hole 42. The position of the light trough 43 relative to the first hole 41 and the second hole 42 can be determined according to the thickness of the second plate 4 and the wiring requirements.

[0048] Optionally, the height of the rear female component 22 may be lower than the depth of the second hole 42, and after the rear female component 22 is set in the second hole 42, the bottom side of the lamp groove 43 may be higher than the top of the rear female component 22, or it may be the same height as the top of the rear female component 22.

[0049] Optionally, the thickness of the front terminal 11 and the rear terminal 21 can be changed or set so that when the front terminal 11 and the rear terminal 21 are located in the hidden hole, they do not contact the wires in the lamp groove 43.

[0050] Optionally, the second hole 42 includes three interconnected second cylindrical holes, and the rear end female component 22 includes a first post 222 and a second post 223. The bottoms of the first post 222 and the second post 223 are connected. The first post 222 abuts against the inner wall of one end of the second cylindrical hole of the second hole 42, and the side of the second post 223 away from the first post 222 extends into another second cylindrical hole and abuts against the inner wall of the other second cylindrical hole. The structure of the first post 222 and the second post 223 prevents the rear end female component 22 from moving within the second cylindrical holes.

[0051] Optionally, the diameters of the first cylindrical hole and the second cylindrical hole can be the same. By drilling holes to form the first hole 41 and the second hole 42, the need for grooving can be avoided, improving the convenience of plate processing and adaptability to different types of processing equipment.

[0052] In one embodiment, the first cylindrical hole and the second cylindrical hole have the same diameter. The diameter of the first cylindrical hole can be 12mm, its depth is 15mm, and the height of the front end female part 12 can be 10mm.

[0053] Optionally, one side of the second column 223 may be located inside the second cylindrical hole where the first column 222 is located, and the other side may be located inside another second cylindrical hole and the other side may be attached to the inner wall of the second cylindrical hole.

[0054] Optionally, the rear end female component 22 may also include a base 224, which is connected to the bottom of the first column 222 and the second column 223 respectively, and the base 224 and the second cylindrical hole can be connected by screws, and the rear end female component 22 is fixed in the second cylindrical hole by the screws on the base 224.

[0055] The concealed connector in this embodiment includes a concealed sub-component and a concealed female-component. The concealed sub-component is fixed to the fixed side of the first plate 3, and the concealed female-component is fixed in a concealed hole on one side of the second plate 4 and is detachably connected to the concealed sub-component inserted into the concealed hole. At least one side of the concealed sub-component is provided with a positioning element for defining the installation orientation of the concealed sub-component. This embodiment enables the concealed female-component to be installed in the concealed hole, reducing the impact on the slotting of the light wire trough, improving the decorative effect and reducing the impact on lighting. Furthermore, the positioning element in the concealed sub-component defines its installation orientation, effectively ensuring the correct installation of the concealed sub-component and the concealed female-component, avoiding the problem of repeated installation due to connection errors, improving furniture production efficiency, reducing plate damage, and lowering production costs.

[0056] The terms "first," "second," "third," "fourth," "1," "2," etc. (if present) in the specification, claims, and accompanying drawings of this application 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 application described herein can be implemented in a sequence other than that shown in the illustrations or text descriptions.

[0057] It should be understood that although arrows indicate various operation steps in the flowcharts of this application's embodiments, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application's embodiments, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all steps in each flowchart, based on the actual implementation scenario, may include multiple sub-steps or multiple stages. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application's embodiments do not limit this.

[0058] The above description is only an optional implementation method for some implementation scenarios of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application without departing from the technical concept of this application also fall within the protection scope of the embodiments of this application.

Claims

1. A concealed connector, characterized in that, It includes a hidden sub-component and a hidden mother-component. The hidden sub-component is fixed to the fixed side of the first plate (3), and the hidden mother-component is fixed in a hidden hole on one side of the second plate (4) and is detachably connected to the hidden sub-component inserted into the hidden hole. At least one side of the hidden sub-component is provided with a positioning element for defining the installation orientation of the hidden sub-component.

2. The concealed connector according to claim 1, characterized in that, The positioning element includes a positioning protrusion (5) located on the side of the hidden sub-component close to the first plate (3), and one end of the mounting hole (6) of the hidden sub-component is located on the same side of the hidden sub-component as the positioning protrusion (5). The first plate (3) is provided with a positioning hole (31) corresponding to the positioning protrusion (5), and the positioning protrusion (5) is fixed to the positioning hole (31).

3. The concealed connector according to claim 1, characterized in that, The hidden sub-component includes a front sub-component (11), and the hidden female component includes a front female component (12). The front sub-component (11) has a pin (111) on one side, and the front female component (12) has a first fixing hole (121) corresponding to the pin (111) on one side. The pin (111) is used to insert into the first fixing hole (121) to fix the first plate (3) and the second plate (4).

4. The concealed connector according to claim 3, characterized in that, The positioning component includes a guide platform (122) or a guide groove (112) disposed on the front terminal component (11). The front end female component (12) is provided with a corresponding guide groove (112) or guide platform (122). The guide platform (122) is used to fit with the guide groove (112) when the pin (111) is inserted into the first fixing hole (121).

5. The concealed connector according to claim 4, characterized in that, The guide platform (122) and the pin (111) are located on the same side of the front terminal piece (11); Alternatively, the guide groove (112) and the pin (111) may be located on the same side of the front terminal piece (11).

6. The concealed connector according to claim 3, characterized in that, The hidden sub-component includes a rear terminal component (21), and the hidden female component includes a rear female component (22). The rear female component (22) and the front female component (12) are fixed in different hidden holes. The rear terminal piece (21) has a second fixing hole (221) on the side near the rear end female piece (22). The rear end female part (22) is provided with a third fixing hole (225) corresponding to the second fixing hole (221). The third fixing hole (225) penetrates the rear end female part (22) and is opposite to the fourth fixing hole (44) that penetrates the side of the second plate (4). The screw passes through the fourth fixing hole (44), the third fixing hole (225) and extends into the second fixing hole (221).

7. The concealed connector according to claim 6, characterized in that, The hidden hole includes a first hole (41) and a second hole (42) formed by drilling. The front end female part (12) is fixed in the first hole (41), and the rear end female part (22) is fixed in the second hole (42). The shape of the front end female part (12) corresponds to the shape of the first hole (41), and the shape of the rear end female part (22) corresponds to the shape of the second hole (42). The second hole (42) is provided with an adjustment space for the rear end female part (21) to move.

8. The concealed connector according to claim 7, characterized in that, The first hole (41) includes two connected first cylindrical holes, the front end piece (12) is fixed in one of the first cylindrical holes, and the side of the front end piece (12) contacts and abuts the inner wall of the first cylindrical hole.

9. The concealed connector according to claim 7, characterized in that, The second plate (4) has a lamp groove (43) connecting the first hole (41) and the second hole (42). The height of the rear end female part (22) and the front end female part (12) is different from the depth of the lamp groove (43).

10. The concealed connector according to claim 7, characterized in that, The second hole (42) includes three connected second cylindrical holes. The rear end female part (22) includes a first column (222) and a second column (223). The bottoms of the first column (222) and the second column (223) are connected. The first column (222) abuts against the inner wall of the second cylindrical hole at one end of the second hole (42). The second column (223) extends from the side away from the first column (222) into another second cylindrical hole and abuts against the inner wall of the other second cylindrical hole.

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