Concealed connection assembly and connection structure

Abstract

The application discloses a hidden connection assembly and a connection structure, and belongs to the technical field of plate connecting pieces. The hidden connection assembly comprises a pre-buried piece and an expansion plug; the bottom center of the pre-buried piece is plastically connected with a first contract block which can be extruded into a clamping groove upward, and the lower part of the front wall and the lower part of the rear wall of the pre-buried piece are both provided with inverted U-shaped holes. According to the application, the inverted U-shaped holes corresponding to each other are arranged on the lower part of the front wall and the lower part of the rear wall of the pre-buried piece, and the first contract block is plastically connected with the bottom center of the pre-buried piece; when the pre-buried piece is knocked against the fastener hole, the inner wall of the bottom of the fastener hole will reversely push the first contract block into the clamping groove of the pre-buried piece; during the process that the first contract block is reversely pushed into the clamping groove, the extrusion blocks located at the front and rear parts of the first contract block will extrude the inner walls on both sides of the inverted U-shaped hole, so that the tail parts of the pre-buried piece on both sides of the inverted U-shaped hole are expanded, thereby further increasing the friction between the pre-buried piece and the wall of the fastener hole, and the fastening degree of the pre-buried piece and the plate is greatly enhanced; after the pre-buried piece is buried into the fastener hole of the plate, the pre-buried piece will not fall off.

Description

Technical Field

[0001] This invention relates to the field of sheet metal connectors, and in particular to an invisible connection component and connection structure. Background Technology

[0002] As people's living standards improve, their demands for furniture quality and aesthetics are increasing. They expect furniture to have advantages such as sturdy structure, convenient installation, and beautiful appearance. Therefore, concealed connection components have emerged. Existing concealed connection components generally include expansion plugs and embedded parts, which can be used to connect side panels (vertical panels) and shelves (horizontal panels).

[0003] Chinese patent document CN218177639U discloses a concealed connector for cabinet decoration, including an embedded part embedded in a panel and an expansion plug inserted into the panel. The embedded part has a groove along its embedding direction within the panel, and the end of the expansion plug exposed outside the panel is inserted into the groove and fixedly connected to the embedded part. To ensure a firm connection between the embedded part and the panel, existing embedded parts have textured surfaces on their outer wall to increase friction. However, the addition of these textures does not completely guarantee that the embedded part will not detach after being embedded in the fastener holes of the panel.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an invisible connector and connection structure, which aims to further enhance the firmness of the connection between the embedded part and the plate compared with the method of setting texture on the outer wall of the embedded part.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An invisible connection component includes an embedded part and an expansion plug; the embedded part has a slot, and the outer wall of the embedded part has a multi-layered toothed first barb structure; the bottom center of the embedded part is plastically connected to a first wedge block that can be squeezed upward into the slot, and the lower part of the front wall and the lower part of the rear wall of the embedded part are provided with inverted U-shaped holes; the two inverted U-shaped holes correspond to each other; the front and rear parts of the first wedge block are provided with extrusion blocks; the two sides of the extrusion blocks are used to extrude the inner walls of the two sides of the inverted U-shaped holes.

[0008] Furthermore, the inner walls on both sides of the inverted U-shaped hole are formed with a second barb structure with multiple layers of teeth, and the surface of the extrusion block that contacts the inner wall of the inverted U-shaped hole is formed with a third barb structure with multiple layers of teeth.

[0009] Furthermore, the expansion plug includes an expansion sleeve and a connecting rod; the expansion sleeve is hollow inside, the connecting rod is disposed inside the expansion sleeve along the axial direction of the expansion sleeve, and one end of the connecting rod extends out of the expansion sleeve; the slot is racetrack-shaped, and an arc-shaped retaining plate is connected to the inner wall of the slot; the arc-shaped retaining plate is used to retain the connecting rod.

[0010] Furthermore, each end of the arc-shaped plate is connected to a limiting block; the width between the two limiting blocks is less than the outer diameter of the connecting rod.

[0011] Furthermore, there are two arc-shaped card plates, which are mirror images of each other on the inner walls of the card slot; a guide plate is inclinedly provided in the card slot; the upper part of the guide plate is located between two limiting blocks connected to one of the arc-shaped card plates, and a placement plate supported by the arc-shaped card plate is connected to the upper part of the guide plate; a support plate that can be supported by the upper part of the first wedge is vertically provided at the bottom of the guide plate.

[0012] Furthermore, the support plate is connected to a vertical plate that contacts the bottom wall of the fastener hole; the vertical plate and the support plate are integrally formed, and a space for accommodating the first wedge is formed between the vertical plate and the support plate.

[0013] Furthermore, a rod head is fixedly connected to one end of the connecting rod extending out of the expansion sleeve; the outer diameter of the rod head is larger than the outer diameter of the connecting rod; the expansion sleeve has two expansion portions that can expand radially outward on the side opposite to the rod head, and a second wedge is plastically connected between the free ends of the two expansion portions, the second wedge being used to expand the expansion portions.

[0014] Furthermore, a multi-layered toothed fourth barb structure is formed on the inner side of the expansion portion, and a multi-layered toothed fifth barb structure is formed on the surface of the second wedge that contacts the inner side of the expansion portion.

[0015] Furthermore, the upper left and right sides of the extrusion block are formed with inclined first clearance surfaces, and the upper left and right sides of the second wedge block are formed with inclined second clearance surfaces.

[0016] The present invention also provides a connection structure, including a first plate and a second plate; the first plate and the second plate are vertically assembled together; in addition, it includes a round tube pin and the aforementioned concealed connection assembly; the concealed connection assembly is used to connect the first plate and the second plate; the round tube pin is vertically disposed on the splicing surface of the first plate, and the splicing surface of the second plate is provided with a pin hole for the round tube pin to be inserted.

[0017] Beneficial effects:

[0018] This invention provides an invisible connector. Corresponding inverted U-shaped holes are formed on the lower front and rear walls of the embedded part. A first wedge is plastically connected to the bottom center of the embedded part. When the embedded part strikes the fastener hole, the inner wall of the fastener hole pushes the first wedge into the groove of the embedded part. During this process, the pressing blocks located in front of and behind the first wedge press against the inner walls of the inverted U-shaped holes, causing the tails of the embedded parts on both sides of the inverted U-shaped holes to be opened. This further increases the friction between the embedded part and the fastener hole wall, greatly enhancing the firmness of the connection between the embedded part and the plate. The embedded part will not fall off after being embedded in the fastener hole of the plate.

[0019] This invention also provides a connection structure, which is part of panel furniture, including a first panel and a second panel, as well as a round tube pin and a concealed connection component for assembling the first and second panels. Compared with existing panel furniture connection structures, the connection structure provided by this invention eliminates the need for ordinary three-in-one connectors, avoiding unsightly problems such as moisture and corrosion caused by exposed eccentric wheels (eccentric fasteners). Furthermore, the connection structure provided by this invention can be disassembled for packaging and transportation, does not damage the panel surface during assembly, and is low-cost as it does not require painting. Attached Figure Description

[0020] Figure 1 A top view of the embedded part provided by the present invention.

[0021] Figure 2 for Figure 1 Sectional view along the AA direction.

[0022] Figure 3 for Figure 2 Sectional view along the BB direction.

[0023] Figure 4 Schematic diagram of the expansion plug Figure 1 .

[0024] Figure 5 Schematic diagram of the expansion plug Figure 2 .

[0025] Figure 6 The three-dimensional simplified form of the embedded part Figure 1 .

[0026] Figure 7 The three-dimensional simplified form of the embedded part Figure 2 .

[0027] Figure 8 The three-dimensional simplified form of the embedded part Figure 3 .

[0028] Figure 9A schematic diagram of the connection between the guide plate and the support plate.

[0029] Figure 10 Schematic diagram of the connection structure provided by the present invention Figure 1 .

[0030] Figure 11 This is a schematic diagram of the structure of the circular tube pin.

[0031] Figure 12 Schematic diagram of the connection structure provided by the present invention Figure 2 .

[0032] Figure label:

[0033] 1-Embedded part; 101-Slot; 102-U-shaped hole; 103-First barb structure; 104-Second barb structure; 105-Arc-shaped clamping plate; 106-Limiting block;

[0034] 2-Expansion insert; 21-Expansion sleeve; 211-Expansion part; 212-Fourth barb structure; 22-Connecting rod; 23-Rod head;

[0035] 3-First wedge;

[0036] 4-Extrusion block; 41-First clearance surface; 42-Third barb structure;

[0037] 5-Guide plate; 6-Placement plate; 7-Support plate; 8-Upright plate;

[0038] 9-Second wedge; 91-Fifth barb structure; 92-Second avoidance surface;

[0039] 10-First plate; 11-Second plate; 111-Pin hole;

[0040] 13-Round tube pin; 131-Chamfer. Detailed Implementation

[0041] This invention provides an invisible connection component and connection structure. To make the purpose, technical solution and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] In the description of this invention, it should be understood that the orientation or positional relationship indicated by the term “” is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the invention and simplifying the description, and should not be construed as a limitation of the invention; in addition, the terms “installation”, “connection”, etc. should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In the description of this invention, it should be understood that the orientation or positional relationship indicated by the term “” is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the invention and simplifying the description, and should not be construed as a limitation of the invention; in addition, the terms “installation”, “connection”, etc. should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Please see Figures 1 to 4 as well as Figure 6 and Figure 7 The present invention provides an invisible connection component, including a pre-embedded part 1 and an expansion plug 2. The pre-embedded part 1 is embedded in the fastener hole of one of the plates, and one end of the expansion plug 2 is inserted into the other plate and the other end is inserted into the pre-embedded part 1. In this way, the two perpendicular plates can be assembled together by means of the pre-embedded part 1 and the expansion plug 2.

[0045] Specifically, the embedded part 1 can be in the shape of an "8" or a long strip, but is not limited to these two shapes. The embedded part 1 has a slot 101. The slot 101 is used to hold the end of the expansion plug 2 exposed outside the plate. The outer wall of the embedded part 1 has a multi-layered toothed first barb structure 103. Figures 6 to 8 (The first barb structure 103 is not shown). The first barb structure 103 is used to increase the friction between the embedded part 1 and the wall of the fastener hole, thereby providing a basic guarantee for the firm connection between the embedded part 1 and the plate. Further, the lower part of the front wall and the lower part of the rear wall of the embedded part 1 are provided with inverted U-shaped holes 102, and the two inverted U-shaped holes 102 correspond to each other. A first wedge block 3 is plastically connected to the bottom center of the embedded part 1. The connection between the first wedge block 3 and the bottom of the embedded part 1 is a point connection, and the front and rear parts of the first wedge block 3 are provided with pressing blocks 4.

[0046] When the embedded part 1 is struck into the fastener hole, the bottom inner wall of the fastener hole pushes the first wedge 3 backward into the slot 101. During the backward pushing of the first wedge 3 into the slot 101, the pressing blocks 4 located in front of and behind the first wedge 3 press against the inner walls on both sides of the inverted U-shaped hole 102, causing the tail of the embedded part 1 on both sides of the inverted U-shaped hole 102 to be opened, thereby further increasing the friction between the embedded part 1 and the wall of the fastener hole. This greatly enhances the firmness of the connection between the embedded part 1 and the plate, and the embedded part 1 will not fall off after being embedded in the fastener hole of the plate.

[0047] It should be noted that the embedded part 1 provided by the present invention is a rubber embedded part 1, and the connection between the first wedge 3 and the bottom of the embedded part 1 is a point connection. Therefore, when the bottom inner wall of the fastener hole generates a reverse holding force on the first wedge 3, the first wedge 3 can be separated from the embedded part 1 and thus can be pushed into the slot 101.

[0048] like Figure 2 and Figure 6 As shown, further, the inner walls on both sides of the inverted U-shaped hole 102 are formed with multi-layered toothed second barb structures 104, and the surface of the extrusion block 4 that contacts the inner wall of the inverted U-shaped hole 102 is formed with multi-layered toothed third barb structures 42. When the first wedge is pushed into the slot 101, the second barb structures 104 and the third barb structures 42 can increase the friction between the extrusion block 4 and the inner wall of the inverted U-shaped hole 102, so that the extrusion block 4, which is separated from the first wedge 3, is always located in the inverted U-shaped hole 102, and the tail of the embedded part 1 can remain in a stretched state, so as not to detach.

[0049] like Figure 4 and Figure 10 As shown, the expansion plug 2 further includes an expansion sleeve 21 and a connecting rod 22. The expansion end of the expansion sleeve 21 can be hammered into another plate connected to the plate with the embedded part 1. The connecting rod 22 is arranged axially inside the expansion sleeve 21, and one end of the connecting rod 22 extends out of the expansion sleeve 21.

[0050] like Figure 1 , Figure 6 as well as Figure 7 As shown, the slot 101 is racetrack-shaped, and an arc-shaped clamping plate 105 is connected to the inner wall of the slot 101. The arc-shaped clamping plate 105 is integrally formed with the embedded part 1. When assembling two mutually perpendicular plates, the end of the connecting rod 22 located outside the expansion sleeve 21 is inserted into the slot 101, and then the connecting rod 22 is pushed forcefully in the direction of the arc-shaped clamping plate 105, so that the connecting rod 22 is clamped into the arc-shaped clamping plate 105, thereby fastening the two plates together and making the plates firmly assembled together.

[0051] like Figure 1 and Figure 7 As shown, further, each end of the arc-shaped card plate 105 is connected to a limiting block 106 integrally formed with the arc-shaped card plate 105; the width between the two limiting blocks 106 is less than the outer diameter of the connecting rod 22, so that when the connecting rod 22 is inserted into the arc-shaped card plate 105, the two limiting blocks 106 can block the connecting rod 22, making it difficult for the connecting rod 22 to detach from the arc-shaped card plate 105, and the connecting rod 22 can be firmly inserted into the arc-shaped card plate 105.

[0052] Since the limiting block 106, the arc-shaped clamping plate 105, and the embedded part 1 are all integrally formed and are all rubber parts, the limiting block 106 can deform to a certain extent when subjected to external force, thereby allowing the connecting rod 22 to be inserted into the arc-shaped clamping plate 105.

[0053] like Figure 8 and Figure 9As shown, further, two arc-shaped clamping plates 105 are provided, which are mirror images of each other on the inner walls of the two sides of the clamping slot 101. A guide plate 5 is inclinedly provided in the clamping slot 101; the upper part of the guide plate 5 is located between two limiting blocks 106 connected to one of the arc-shaped clamping plates 105, and the upper part of the guide plate 5 is connected to a placement plate 6 supported by the arc-shaped clamping plate 105. The bottom of the guide plate 5 is vertically provided with a support plate 7 that can be supported by the upper part of the first wedge (that is, the support plate 7 needs to be used in conjunction with the first wedge 3). The guide plate 5 is also a rubber part, which is integrally formed with the placement plate 6 and the support plate 7.

[0054] When it is necessary to disassemble the assembled sheet material, the connecting rod 22 moves out of the arc-shaped clamping plate 105 by the external force applied to the sheet material. After the connecting rod 22 moves out of the arc-shaped clamping plate 105, the guide plate 5 can guide the end of the connecting rod 22 to move out of the embedded part 1, so that the sheet material (such as a shelf) can be taken out without obstruction.

[0055] By connecting the placement plate 6 to the upper part of the guide plate 5 and setting the support plate 7 at the bottom of the guide plate 5, the guide plate 5 can be stably placed in the slot 101 under the action of the limiting block 106 and will not move at will, thereby playing the role of smoothly guiding the end of the connecting rod 22 to move out of the embedded part 1.

[0056] Since the guide plate 5 can be placed independently in the slot 101, the embedded part 1 does not need to be integrally formed with the guide plate 5, which simplifies the forming process of the embedded part 1.

[0057] like Figure 9 As shown, the support plate 7 is further connected to a vertical plate 8 that contacts the bottom wall of the fastener hole; the vertical plate 8 and the support plate 7 are integrally formed, and a space for accommodating the first wedge 3 is formed between the vertical plate 8 and the support plate 7, so the first wedge can also restrict the guide plate 5 from moving in the slot 101.

[0058] like Figure 4 As shown, further, a rod head 23 is fixedly connected to one end of the connecting rod 22 extending out of the expansion sleeve 21. The outer diameter of the rod head 23 is larger than the outer diameter of the connecting rod 22, making it impossible for the connecting rod 22 to be pulled out along the length of the connecting rod 22 to remove the arc-shaped retaining plate 105. When the expansion insert 2 is set on the shelf, the shelf can only be removed along the length of the side plate.

[0059] The expansion sleeve 21 has two radially outward-expanding expansion portions 211 on the side opposite to the rod head 23, and a second wedge is plastically connected between the free ends of the two expansion portions 211. The connection between the second wedge 9 and the expansion portions 211 is also a point connection. The second wedge 9 and the first wedge 3 have the same function: to expand the embedded part 1 or the expansion plug 2 through the reverse holding force of the bottom wall of the hole. For the expansion plug 2, when the second wedge is inserted between the two expansion portions 211, the expansion portions 211 can expand radially outward along the expansion sleeve 21, thereby making the expansion sleeve 21 firmly locked in the hole of the plate it is used with. Compared with the existing expansion plug 2, the structure of the expansion portion 211 of the present invention is simpler.

[0060] It should be noted that the expansion sleeve 21 provided by the present invention is a rubber expansion sleeve 21, and the second wedge 9, which is also made of rubber, is connected to the expansion part 211 by a point connection. Therefore, when the second wedge 9 is subjected to a holding force in the opposite direction to the installation direction of the expansion sleeve 21 (expansion plug 2), the second wedge 9 can be separated from the expansion part 211, thereby enabling the two expansion parts 211 to expand outward along the radial direction of the expansion sleeve 21.

[0061] Please see Figure 4 and Figure 5 , Figure 4 and Figure 5 Two expansion plugs 2 of different lengths are shown respectively. When the expansion plug 2 is shorter, the expansion plug 2 and the embedded part 1 can be used to assemble plates with a splicing surface of 45 degrees (such as...). Figure 12 As shown in the figure, at this time, the size and specifications of the embedded part 1 do not need to be changed, so the embedded part 1 has strong versatility.

[0062] Furthermore, the club head 23 can be a compressible club head with a spring-back function. The principle of the compression and spring-back of the club head 23 is an existing technology of the existing expansion plug 2, and will not be elaborated here. When the club head 23 is compressible and spring-back, during the assembly of mutually perpendicular plates (layer plates and side plates), the layer plate with the expansion plug 2 installed can usually contact the side plate without obstruction. At this time, the club head 23 is in a compressed state until the club head 23 moves to the slot 101 position of the embedded part 1, at which point the club head 23 springs back to its original position, and then... Figure 10 The arrow indicates the direction to push the plate connected to the expansion plug 2, so that the connecting rod 22 is finally inserted into the arc-shaped plate 105, so that the two plates can be firmly assembled together.

[0063] When it is necessary to disassemble the assembled sheet metal, the guide plate 5 can act on the rod head 23, so that the rod head 23 is in a compressed state. In order to spring back and reset, the rod head 23 will act in the opposite direction on the expansion sleeve 21 with the help of the connecting rod 22, so that the sheet metal (such as the shelf) with the expansion plug 2 installed can be removed more easily.

[0064] like Figure 4 As shown, further, a multi-layered toothed fourth barb structure 212 is formed on the inner side of the expansion portion 211, and a multi-layered toothed fifth barb structure 91 is formed on the surface of the second wedge block that contacts the inner side of the expansion portion 211. The third barb structure 42 and the fourth barb structure 212 can increase the friction between the second wedge block 9 and the inner side of the expansion portion 211, so that after the second wedge block 9 is separated from the expansion portion 211, it is always located between the two expansion portions 211, and the expansion portion 211 can maintain its expanded state. After the expansion plug 2 is installed on the board material, such as the shelf, it is not easy to fall off the shelf.

[0065] Furthermore, the upper left and right sides of the compression block 4 are provided with inclined first clearance surfaces 41, and the upper left and right sides of the second wedge are provided with inclined second clearance surfaces 92. The first clearance surfaces 41 allow the first wedge 3 to be pushed into the slot 101, while the compression blocks 4 at the front and rear of the first wedge 3 can act on the wall of the inverted U-shaped hole 102; and the second clearance surfaces 92 allow the second wedge to be squeezed between the two expansion parts 211 at the end of the expansion sleeve 21, and the expansion parts 211 can expand to achieve the function of strengthening the connection.

[0066] like Figure 10 and Figure 11 As shown, the present invention also provides a connection structure, which can be part of panel furniture, including a first board 10 and a second board 11; the first board 10 can be a shelf, and the second board 11 can be a side panel, with the shelf and side panel assembled vertically together. Furthermore, the connection structure also includes a round tube pin 13 and the aforementioned concealed connection assembly.

[0067] Specifically, in the concealed connection assembly, the expansion plug 2 can be vertically installed on the splicing surface of the shelf (the splicing surface of the shelf is perforated), while the embedded part 1 is embedded in the fastener hole located on the splicing surface of the side panel. The round tube pin 13 can be vertically set on the splicing surface of the shelf, and correspondingly, the splicing surface of the side panel is provided with a pin hole 111 for the round tube pin 13 to be inserted.

[0068] The use of round tube pin 13 can increase the accuracy of panel assembly and the firmness of panel connection, meeting the product requirements of panel furniture.

[0069] The round tube pin 13 provided by the present invention can be formed by bending galvanized iron sheet. After bending, the galvanized iron sheet does not need to be welded and sealed, reducing the manufacturing process. In order to facilitate the insertion of the round tube pin 13 into the shelf, the end of the round tube pin 13 is chamfered 131.

[0070] Compared to existing panel furniture connection structures, the connection structure provided by this invention eliminates the need for ordinary three-in-one connectors (i.e., eccentric wheel, rod, and pre-embedded nut), avoiding unsightly issues such as moisture and corrosion caused by exposed eccentric wheels (eccentric fasteners) on the board. Furthermore, the connection structure provided by this invention can be disassembled for packaging and transportation, and will not damage the board surface during assembly, resulting in low assembly costs as it does not require painting.

[0071] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A concealed connection component, comprising an embedded part and an expansion plug; the embedded part has a slot, and the outer wall of the embedded part has a multi-layered toothed first barb structure; characterized in that, The bottom center of the embedded part is plastically connected to a first wedge block that can be squeezed upward into a slot, and the lower part of the front wall and the lower part of the rear wall of the embedded part are provided with inverted U-shaped holes; the two inverted U-shaped holes correspond to each other; the front and rear parts of the first wedge block are provided with extrusion blocks; the two sides of the extrusion blocks are used to extrude the inner walls of the two sides of the inverted U-shaped holes. The expansion insert includes an expansion sleeve and a connecting rod; the expansion sleeve is hollow inside, and the connecting rod is disposed inside the expansion sleeve along its axial direction, with one end of the connecting rod extending out of the expansion sleeve; the slot is racetrack-shaped, and an arc-shaped retaining plate is connected to the inner wall of the slot; the arc-shaped retaining plate is used to hold the connecting rod; each end of the arc-shaped retaining plate is connected to a limiting block; the width between the two limiting blocks is less than the outer diameter of the connecting rod; two arc-shaped retaining plates are provided, which are mirror images of each other and are disposed on the inner walls of the slot; the slot contains... An inclined guide plate is provided; the upper part of the guide plate is located between two limiting blocks connected to one of the arc-shaped clamping plates, and a placement plate supported by the arc-shaped clamping plate is connected to the upper part of the guide plate; a support plate is vertically provided at the bottom of the guide plate, which can be supported by the upper part of the first wedge; the guide plate is a rubber part, and the guide plate, placement plate and support plate are integrally formed; the support plate is connected to a vertical plate that contacts the bottom wall of the fastener hole; the vertical plate and support plate are integrally formed, and a space for accommodating the first wedge is formed between the vertical plate and support plate; The connecting rod extends out of the expansion sleeve and is fixedly connected to a rod head; the rod head is compressible and has a spring-back function; when assembling two plates, one plate with the expansion plug is in contact with the other plate. At this time, the rod head is in a compressed state until the rod head moves to the pre-embedded slot on the other plate. The rod head then springs back to its original position and pushes the plate with the expansion plug connected to it, so that the connecting rod is inserted into the arc-shaped card plate of the pre-embedded part on the other plate, so that the two plates are firmly assembled together. When disassembling and assembling the sheet metal, the guide plate acts on the rod head, causing the rod head to be in a compressed state. At this time, in order to spring back and reset, the rod head will use the connecting rod to react on the expansion sleeve, making it easier to remove the sheet metal with the expansion plug installed.

2. The invisible connection component according to claim 1, characterized in that, The inner walls on both sides of the inverted U-shaped hole are formed with a second barb structure with multiple layers of teeth, and the surface of the extrusion block that contacts the inner wall of the inverted U-shaped hole is formed with a third barb structure with multiple layers of teeth.

3. The invisible connection component according to claim 1, characterized in that, The outer diameter of the rod head is larger than the outer diameter of the connecting rod; the expansion sleeve has two expansion parts that can expand radially outward on the side opposite to the rod head, and a second wedge is plastically connected between the free ends of the two expansion parts, the second wedge being used to expand the expansion parts.

4. The invisible connection component according to claim 3, characterized in that, The inner side of the expansion portion has a multi-layered toothed fourth barb structure, and the surface of the second wedge that contacts the inner side of the expansion portion has a multi-layered toothed fifth barb structure.

5. The invisible connection component according to claim 3, characterized in that, The upper left and right sides of the extrusion block have inclined first clearance surfaces, and the upper left and right sides of the second wedge block have inclined second clearance surfaces.

6. A connecting structure, comprising a first plate and a second plate; the first plate and the second plate are vertically assembled together; characterized in that, It also includes a round tube pin and the concealed connection assembly as described in any one of claims 1-5; the concealed connection assembly is used to connect the first plate and the second plate; the round tube pin is vertically disposed on the splicing surface of the first plate, and the splicing surface of the second plate is provided with a pin hole for the round tube pin to be inserted.

Images