A sofa
By setting a combination structure of insert plates and plugs on the sofa base and backrest, and using the guide surface of the elastic snap-fit component to automatically push open or lock, the problem of difficult sofa backrest disassembly is solved, enabling convenient single-person operation and reducing production and processing difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG KAICHUANG TECH CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-06-09
AI Technical Summary
The existing sofa backrests are difficult to disassemble, difficult for a single person to operate, and difficult to manufacture.
It adopts a combination structure of insert plate and plug socket. The insert plate is equipped with positioning holes and the plug socket is equipped with elastic locking parts. It can be automatically pushed open or locked by the guide surface, simplifying the operation.
It enables a single person to easily disassemble the backrest, reducing production and processing difficulties and improving user experience and assembly efficiency.
Smart Images
Figure CN224330681U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of furniture, specifically relating to a sofa. Background Technology
[0002] Sofas typically consist of a base and a backrest. For ease of transport and handling, the backrest is detachably connected to the base. The base and backrest are connected using a backrest connector. Currently, existing backrest connectors usually consist of two components, one mounted on the backrest and the other on the base, which interlock to allow for the installation of the backrest and base.
[0003] The invention patent application with application number 202010276527.2 discloses a sofa in which the first component installed on the backrest is assembled from two parts: a first base plate and a limiting member. This is difficult to manufacture and process. Moreover, when disassembling the backrest, it is necessary to first reach into the gap between the backrest and the sofa base, and move the unlocking lever on the limiting member to unlock it, and then pull the backrest upwards. This operation is difficult and difficult for a single person to operate. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a sofa that solves the problem of the difficulty in disassembling the sofa back.
[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A sofa, including a backrest and a sofa base, wherein the sofa base and the backrest are detachably connected by a plug-in assembly. The plug-in assembly includes: a plug plate, the lower part of which is fixed to the sofa base, and a positioning hole extending horizontally through the upper part of the plug plate; and a plug-in seat, which includes an integrally formed elastic snap-fit component and a seat body. The seat body is fixed to the side of the backrest, and the seat body has a slot that mates with the plug plate. The plug plate is inserted longitudinally into the slot, and the elastic snap-fit component extends laterally into the slot and engages with the positioning hole to lock the plug plate and the plug-in seat together. The elastic snap-fit component has a downwardly inclined first guide surface and an upwardly inclined second guide surface. During the insertion process of the plug plate and the plug-in seat, the plug plate pushes the elastic snap-fit component away through the first guide surface to align the positioning hole with the elastic snap-fit component. During the disengagement process of the plug plate and the plug-in seat, the plug plate pushes the elastic snap-fit component away through the second guide surface to disengage the positioning hole from the elastic snap-fit component. This technical solution has the following technical effects:
[0006] This invention features matching insert plates and connectors on the sofa base and backrest, respectively. This allows the backrest to be installed, positioned, or removed by inserting or detaching the insert plates and connectors into their slots. By integrally molding the connector body and the elastic locking element, the structure and manufacturing complexity of the connector are greatly simplified. During installation of the backrest and sofa base, the insert plate automatically pushes open the elastic locking element via a downward-sloping first guide surface. When the backrest and sofa base are in place, the elastic locking element engages with the positioning hole of the insert plate to lock the insert plate and connector. To detach the backrest and sofa base, simply drag the backrest upwards; the insert plate will automatically push open the elastic locking element via an upward-sloping second guide surface. This eliminates the need for additional tools or reaching into the sofa's seams to manipulate the elastic locking element, making the operation more convenient and simple, allowing for single-person operation and enhancing the user experience.
[0007] In one type of sofa described above, the seat includes a back panel fixed to the backrest, with both sides of the back panel bent towards each other to form a slot on the side of the back panel away from the backrest. By bending the back panel to form a slot on the seat, the manufacturing difficulty of the seat can be greatly reduced, assembly efficiency can be improved, and manufacturing costs can be reduced.
[0008] In the aforementioned sofa, the elastic locking component includes a deformable portion connected to the back panel at its upper end and a locking portion having a first guide surface and a second guide surface. The locking portion is located on one side of the lower end of the deformable portion to engage with a positioning hole. When the locking portion is pushed open by the insert plate, the deformable portion undergoes elastic deformation. When the locking portion is no longer pushed by the insert plate, the deformable portion automatically resets under the action of elastic force. The structure is simple, reliable, and durable.
[0009] In the aforementioned sofa, the elastic locking element is a spring sheet. The upper end of the spring sheet is connected to the back panel to form a deformation part, and the lower end of the spring sheet is bent twice to form a locking part. The spring sheet has a large elastic deformation, and its reset effect as a deformation part is good. By bending the spring sheet to form the locking part, the locking part has a certain strength, while reducing the manufacturing difficulty of the elastic locking element. The lower end of the spring sheet is initially bent towards the positioning hole to form a second guide surface. The middle part of the bent portion of the spring sheet is bent a second time away from the positioning hole to form a first guide surface. This results in the locking part formed by the second bending having a notch with an opening facing away from the positioning hole. The notch gives the locking part a certain deformation. When the locking part is pushed by the insert plate, it can deform towards the notch to avoid the insert plate. There is no need to reserve too much space in the slot to accommodate the locking part pushed open by the insert plate, thus avoiding the insert plate from shaking in the slot due to excessively thick slots.
[0010] In the aforementioned sofa, the back panel also features a clearance hole, which is positioned opposite to the elastic latching member to allow it to pass over when pushed. When the elastic latching member is pushed, it extends into the clearance hole, which accommodates the lower end of the member, allowing it to move to a position that does not obstruct the sliding of the insert plate. This clearance hole reduces the slot space occupied by the elastic latching member when it passes over the insert plate, thus reducing the thickness of the slot and making the connection between the insert plate and the slot more stable and reliable.
[0011] In the aforementioned sofa, the back panel is fixed to the backrest with screws. The upper and lower ends of the back panel are respectively provided with recesses for accommodating the screw heads. The recesses arch towards the backrest to form a clearance gap between the back panel and the backrest that communicates with the clearance hole. The screw head is positioned within a recessed groove, which accommodates the screw head to prevent it from obstructing the insertion of the insert plate into the slot. The recess is formed by the arching of the back panel towards the backrest, reducing the thickness of the back panel and thus the weight of the connector. Simultaneously, the arched recess abuts against the backrest, creating a clearance gap that connects to the clearance hole. When the elastic snap-fit is pushed, it can deform through the clearance hole into the clearance gap. This clearance gap mates with the clearance hole, providing greater clearance space for the elastic snap-fit pushed aside by the insert plate. This eliminates the need for pre-reserved space within the slot for the elastic snap-fit to avoid the insert plate, preventing the insert plate from wobbling within the slot due to the slot thickness exceeding the insert plate thickness by too much, and thus preventing the backrest from wobbling on the sofa base, resulting in a more stable installation.
[0012] In the aforementioned sofa, the insert includes a fixing part and a connecting part located at the upper end of the fixing part. The fixing part is fixed to the sofa base by a locking member, and the connecting part is inserted into the slot. The structure is simple and reliable.
[0013] In the aforementioned sofa, the upper end of the fixing part is provided with stop steps on both sides of the connecting part. When the connecting part is inserted into the slot, the stop steps abut against the bottom of the insertion seat. When the insert plate is inserted into the slot, the connecting part is inserted into the slot, and the stop steps abut against the bottom of the insertion seat to prevent the insert plate from moving further into the insertion seat, ensuring that the positioning hole and the elastic snap-fit are aligned, and at the same time indicating to the operator that the backrest has been installed in place, thus improving the user experience.
[0014] In the aforementioned sofa, the connecting part is provided with multiple limiting protrusions protruding from the surface of the connecting part. These limiting protrusions abut against the inner wall of the slot to laterally limit the insertion plate. When the thickness of the slot is greater than the thickness of the insertion plate, the limiting protrusions can fill the gap between the insertion plate and the inner wall of the slot. By abutting against the inner wall of the slot, the limiting protrusions laterally limit the insertion plate, preventing the insertion plate from wobbling left and right within the slot due to excessive gaps. This makes the insertion of the insertion plate and the slot more stable, thereby making the installation of the backrest on the sofa base more secure.
[0015] In the aforementioned sofa, the insert plate has a strip-shaped protrusion protruding from its surface in the middle. This strip-shaped protrusion extends longitudinally along the insert plate, with its upper and lower ends located inside and outside the slot, respectively. Because the insert plate is sheet-like, with its lower part fixed to the sofa base and its upper part suspended for insertion into the slot, it is prone to bending in the middle if the insert plate is not strong enough during backrest installation. The longitudinally extending strip-shaped protrusion enhances the overall strength of the insert plate, especially the strength in the middle, preventing bending when the insert plate and the socket are inserted.
[0016] The features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0018] Figure 1 This is a side view of a sofa according to the present invention;
[0019] Figure 2 This is a schematic diagram showing the insertion of the plug-in board and the socket.
[0020] Figure 3 This is a partial sectional view of a sofa according to the present invention;
[0021] Figure 4 This is a 3D view of the connector;
[0022] Figure 5 This is a 3D view of the insert plate.
[0023] Figure label:
[0024] 100. Backrest; 110. Clearance;
[0025] 200. Sofa base;
[0026] 300, Insert plate; 310, Connecting part; 311, Positioning hole; 312, Limiting protrusion; 320, Fixing part; 321, Stop step; 330, Strip-shaped protrusion; 340, Weight reduction hole;
[0027] 400, Socket; 410, Base; 411, Backplate; 4111, Clearance Hole; 4112, Countersunk Groove; 412, Folded Edge; 413, Slot; 420, Flexible Snap-fit Member; 421, Deformation Part; 422, Locking Part; 4221, First Guide Surface; 4222, Second Guide Surface; 4223, Notch. Detailed Implementation
[0028] This utility model discloses a sofa, including a backrest and a sofa base. The sofa base and the backrest are detachably connected by a plug-in assembly. The plug-in assembly includes: a plug plate, the lower part of which is fixed to the sofa base, and a positioning hole that extends horizontally through the upper part of the plug plate; and a plug-in seat, which includes an integrally formed elastic snap-fit member and a seat body. The seat body is fixed to the side of the backrest and has a slot that mates with the plug plate. The plug plate is inserted longitudinally into the slot, and the elastic snap-fit member extends laterally into the slot and engages with the positioning hole to lock the plug plate and the plug-in seat together. The elastic snap-fit member has a downwardly inclined first guide surface and an upwardly inclined second guide surface. During the insertion process of the plug plate and the plug-in seat, the plug plate pushes the elastic snap-fit member away through the first guide surface to align the positioning hole with the elastic snap-fit member. During the disengagement process of the plug plate and the plug-in seat, the plug plate pushes the elastic snap-fit member away through the second guide surface to disengage the positioning hole from the elastic snap-fit member. This invention features matching insert plates and connectors on the sofa base and backrest, respectively. This allows the backrest to be installed, positioned, or removed by inserting or detaching the insert plates and connectors into their slots. By integrally molding the connector body and the elastic locking element, the structure and manufacturing complexity of the connector are greatly simplified. During installation of the backrest and sofa base, the insert plate automatically pushes open the elastic locking element via a downward-sloping first guide surface. When the backrest and sofa base are in place, the elastic locking element engages with the positioning hole of the insert plate to lock the insert plate and connector. To detach the backrest and sofa base, simply drag the backrest upwards; the insert plate will automatically push open the elastic locking element via an upward-sloping second guide surface. This eliminates the need for additional tools or reaching into the sofa's seams to manipulate the elastic locking element, making the operation more convenient and simple, allowing for single-person operation and enhancing the user experience.
[0029] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.
[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., 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.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] Example:
[0035] A type of sofa, such as Figures 1 to 5As shown, the sofa includes a backrest 100 and a sofa base 200, which are separate components connected detachably via a plug-in assembly. The plug-in assembly includes a plug plate 300 and a plug socket 400. The plug plate 300 is mounted on the sofa base 200, with its lower part fixed to the sofa base 200. A positioning hole 311 is provided on the upper part of the plug plate 300, protruding from the sofa base 200. The positioning hole 311 extends horizontally through the plug plate 300. The connector 400 includes a base 410 and a resilient snap-fit member 420 disposed on the base 410. The base 410 and the resilient snap-fit member 420 are integrally formed. The base 410 is fixed to the side of the backrest 100. A slot 413 is provided on the base 410 for engaging with a insert plate 300. When the backrest 100 is installed on the sofa base 200, the insert plate 300 is longitudinally inserted into the slot 413. At this time, the resilient snap-fit member 420 extends laterally into the slot 413 and engages with the positioning hole 311. The engaging resilient snap-fit member 420 and the positioning hole 311 lock the insert plate 300 and the connector 400 together. The resilient snap-fit member 420 is provided with a first guide surface 4221 and a second guide surface 4222. The first guide surface 4221 is inclined downwards, and the second guide surface 4222 is inclined upwards.
[0036] When the user needs to install the backrest 100 onto the sofa base 200, the insertion plate 300 and the connector 400 are simultaneously connected. During this process, the downward-moving backrest 100 causes the connector 400 to move downward, so that the top of the insertion plate 300 is inserted upward into the slot 413 until the top of the insertion plate 300 abuts against the first guide surface 4221. Because the first guide surface 4221 is inclined downward, the insertion plate 300 abutting against the first guide surface 4221 will move along... As the first guide surface 4221 slides upward, the force applied by the insert plate 300 to the elastic snap-fit member 420 through the first guide surface 4221 will push the elastic snap-fit member 420 to one side, so that the insert plate 300 continues to move upward along the slot 413 until the positioning hole 311 is aligned with the elastic snap-fit member 420. The elastic snap-fit member 420, which is no longer pushed laterally by the insert plate 300, resets under the action of elastic force and snaps into the positioning hole 311. At this time, the insert plate 300 and the insert base 400 are inserted into place.
[0037] When the user needs to remove the backrest 100 from the sofa base 200, the insert plate 300 and the connector 400 will be disengaged simultaneously. During this process, the user drags the backrest 100 upward, causing the connector 400 on the backrest 100 to move upward, so that the insert plate 300 moves downward in the slot 413 until the insert plate 300 above the positioning hole 311 abuts against the second guide surface 4222. Because the second guide surface 4222 is inclined upward, the insert plate 300 abutting against the second guide surface 4222 will slide down along the second guide surface 4222. The force applied by the insert plate 300 to the elastic snap fastener 420 through the second guide surface 4222 will push the elastic snap fastener 420 to one side, so that the positioning hole 311 and the elastic snap fastener 420 are disengaged, and then the insert plate 300 continues to move downward along the slot 413 until the insert plate 300 and the connector 400 are disengaged.
[0038] This utility model provides a matching insert plate 300 and a connector 400 on the sofa base 200 and backrest 100, respectively. This allows the backrest 100 on the sofa base 200 to be installed, positioned, or disassembled by inserting or disassembling the insert plate 300 and the connector 400 through the slots 413 on the connector 400. By integrally molding the seat body 410 and the elastic snap-fit member 420 of the connector 400, the structure and manufacturing difficulty of the connector 400 are greatly simplified. When installing the backrest 100 and the sofa base 200, the insert plate 300 can automatically push open the elastic snap-fit member 420 through the downwardly inclined first guide surface 4221. When the backrest 100 and sofa base 200 are installed in place, the elastic locking member 420 engages with the positioning hole 311 of the insert plate 300 to lock the insert plate 300 and the socket 400. When the backrest 100 and sofa base 200 need to be detached, simply drag the backrest 100 upwards, and the insert plate 300 will automatically push open the elastic locking member 420 via the upwardly tilted second guide surface 4222. The insert plate 300 and the socket 400 can be unlocked without the user needing to use additional tools or reach into the sofa gap to manipulate the elastic locking member 420. This makes the operation more convenient and simple, and can be operated by a single person, improving the user experience.
[0039] like Figure 4As shown, in this embodiment, the seat 410 includes a back plate 411, which is fixed to the backrest 100. An elastic snap-fit member 420 is disposed on the back plate 411. The two sides of the back plate 411 are bent towards each other to form flanges 412, creating a slot 413 between the back plate 411 and the flanges 412 on the side of the back plate 411 away from the backrest 100. By bending the back plate 411 to form the slot 413 on the seat 410, the manufacturing difficulty of the seat 410 can be greatly reduced, assembly efficiency improved, and manufacturing costs reduced. In this embodiment, the two flanges 412 do not abut against each other, forming a gap of a certain width between them. This reduces the weight of the seat 410 while facilitating the locking of the back plate 411 to the backrest 100 using screws or other locking devices. Of course, it is understood that in other embodiments, the two flanges may abut against each other. Preferably, the width of the slot 413 gradually decreases from the bottom to the top, which reduces the alignment accuracy when the insert plate 300 and the slot 413 are inserted. When the insert plate 300 and the slot 413 are inserted, the insert plate 300 can also be stopped, which facilitates user operation.
[0040] In this embodiment, the elastic snap-fit component 420 includes a deformable part 421 and a locking part 422. The upper end of the deformable part 421 is connected to the back plate 411, and the lower end of the deformable part 421 facing the insert plate 300 has a locking part 422. A first guide surface 4221 and a second guide surface 4222 are provided on the locking part 422, which is used to snap into the positioning hole 311. When the locking part 422 is pushed open by the insert plate 300, the deformable part 421 undergoes elastic deformation. When the locking part 422 is no longer pushed by the insert plate 300, the deformable part 421 automatically resets the locking part 422 under the action of elastic force. The structure is simple, reliable, and durable. Figure 3 and Figure 4As shown, preferably, the elastic snap-fit element 420 is a spring sheet. The upper end of the spring sheet is connected to the back plate 411 to form a deformation part 421, and the lower end of the spring sheet is bent twice to form a locking part 422. The spring sheet has a large elastic deformation, and the reset effect of the deformation part 421 is good. By bending the spring sheet to form the locking part 422, the locking part 422 has a certain strength, and the manufacturing difficulty of the elastic snap-fit element 420 can be reduced. The lower end of the spring sheet is initially bent towards the positioning hole 311 to form a second guide surface 4222. The middle part of the bent portion of the spring sheet is bent a second time away from the positioning hole 311 to form a first guide surface 4221, so that the locking part 422 formed by the second bending has an opening away from the positioning hole 311. The notch 4223 provided in the hole 311 allows the locking part 422 to have a certain deformation. When the locking part 422 is pushed by the insert plate 300, it can elastically deform in the direction of the notch 4223 (i.e., change the included angle between the first guide surface 4221 and the second guide surface 4222) to avoid the insert plate 300. There is no need to reserve too much space in the slot 413 to accommodate the locking part 422 that is pushed open by the insert plate 300, thus avoiding the insert plate 300 from shaking in the slot 413 due to the slot 413 being too thick.
[0041] In this embodiment, a clearance hole 4111 is provided on the back plate 411. The clearance hole 4111 is arranged opposite to the elastic snap-fit member 420 to avoid the locking part 422 that is pushed open by the insert plate 300. When the elastic snap-fit member 420 is pushed, the elastic snap-fit member 420 extends into the clearance hole 4111. The clearance hole 4111 accommodates the lower end of the elastic snap-fit member 420, so that the elastic snap-fit member 420 moves to a position that does not obstruct the up and down sliding of the insert plate 300. The setting of the clearance hole 4111 can reduce the space occupied by the slot 413 when the elastic snap-fit member 420 avoids the insert plate 300, reduce the thickness of the slot 413, and avoid the insert plate 300 shaking due to the slot 413 being too thick, so that the insertion of the insert plate 300 and the slot 413 is more stable and reliable.
[0042] The back plate 411 of the connector 400 is fixed to the backrest 100 by screws. Recessed grooves 4112 are provided at the upper and lower ends of the back plate 411. The screws pass through the back plate 411 and extend into the backrest 100, with the screw heads positioned within the recessed grooves 4112. The recessed grooves 4112 accommodate the screw heads to prevent them from obstructing the insertion of the connector 300 into the slot 413. In this embodiment, the recessed grooves 4112 are formed by the back plate 411 arching towards the backrest 100, reducing the thickness of the back plate 411 that forms the recessed grooves 4112, thereby reducing the weight of the connector 400. Simultaneously, as... Figure 3As shown, because the arched recess 4112 abuts against the backrest 100, a clearance gap 110 communicating with the clearance hole 4111 can be formed between the back panel 411 installed on the backrest 100 and the backrest 100. When the elastic snap-fit 420 is pushed, the elastic snap-fit 420 can pass through the clearance hole 4111 and deform into the clearance gap 110. The clearance gap 110 can cooperate with the clearance hole 4111, providing a larger clearance space for the elastic snap-fit 420 that is pushed away by the insert plate 300. There is no need to reserve space in the slot 413 for the elastic snap-fit 420 to avoid the insert plate 300. This prevents the insert plate 300 from shaking in the slot 413 due to the thickness of the slot 413 being too much greater than the thickness of the insert plate 300, thereby preventing the backrest 100 from shaking on the sofa base 200, making the installation more stable.
[0043] like Figure 5 As shown, in this embodiment, the insert plate 300 includes a fixing part 320 and a connecting part 310 disposed on the upper end of the fixing part 320. The fixing part 320 is fixed to the sofa base 200 by screws or other locking components. The connecting part 310 protrudes from the top of the sofa base 200 for insertion into the slot 413. In order to install and position the insert plate 300 and the insertion socket 400 during installation, this embodiment provides stop steps 321 on both sides of the connecting part 310 at the upper end of the fixing part 320. When the insert plate 300 is inserted into the slot 413, the connecting part 310 is inserted into the slot 413. The stop steps 321 abut against the bottom of the insertion socket 400 to prevent the insert plate 300 from moving further into the insertion socket 400, ensuring that the positioning hole 311 is aligned with the elastic snap-fit component 420, and simultaneously indicating to the operator that the backrest 100 has been installed in place, thus improving the user experience. In this preferred embodiment, the width of the fixing part 320 is greater than the width of the connecting part 310, so that stop steps 321 are formed on both sides of the connecting part 310 at the upper end of the fixing part 320, and the fixing part 320 supports the stop steps 321 below, making it more stable and reliable. Of course, it can be understood that in other embodiments, stop protrusions can also be provided on both sides of the top of the fixing part, and the stop steps are provided on the top surface of the stop protrusions.
[0044] In this embodiment, the connecting part 310 has multiple limiting protrusions 312 on the side facing away from the backrest 100. The limiting protrusions 312 protrude from the surface of the connecting part 310 and abut against the side of the folded edge 412 facing the slot 413. When the thickness of the slot 413 is greater than the thickness of the insert plate 300, the side of the connecting part 310 facing the backrest 100 abuts against the back plate 411. The setting of the limiting protrusions 312 can fill the gap between the insert plate 300 and the inner wall of the slot 413. The limiting protrusions 312 abut against the inner wall of the slot 413 to limit the insert plate 300 laterally, so as to avoid the gap between the insert plate 300 and the inner wall of the slot 413 being too large, causing the insert plate 300 to sway left and right in the slot 413. This makes the insertion of the insert plate 300 and the slot 413 more stable, and thus makes the installation of the backrest 100 on the sofa base 200 more stable.
[0045] The insert plate 300 has a strip-shaped protrusion 330 in the middle. The strip-shaped protrusion 330 protrudes from the surface of the insert plate 300 and extends longitudinally along the surface of the insert plate 300. The strip-shaped protrusion 330 extends from the middle of the insert plate 300 to the upper and lower ends. The upper end of the strip-shaped protrusion 330 is located on the insert plate 300 inside the slot 413, and the lower end of the strip-shaped protrusion 330 is located on the insert plate 300 outside the slot 413. Because the insert plate 300 is sheet-shaped, with its lower part fixed to the sofa base 200 and its upper part suspended for insertion into the slot 413, if the strength of the insert plate 300 is insufficient when installing the backrest 100, it is very easy for it to bend in the middle of the insert plate 300 (i.e., at the connection between the fixing part 320 and the connecting part 310). The longitudinally extending strip-shaped protrusion 330 can enhance the overall strength of the insert plate 300, especially the strength of the middle part of the insert plate 300, and prevent the insert plate 300 from bending when inserting the insert plate 300 and the insert socket 400.
[0046] The side of the insert plate 300 facing the backrest 100 is designated as the mounting surface, and the side of the insert plate 300 facing away from the backrest 100 is designated as the mating surface. Preferably, both the limiting protrusion 312 and the strip-shaped protrusion 330 are formed by arching from the mounting surface of the backplate 411 to the mating surface, achieving the protrusion while minimizing the weight of the insert plate 300. To further reduce the weight of the insert plate 300, weight-reducing holes 340 may also be provided on the insert plate 300.
[0047] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A sofa, comprising a backrest and a sofa base, wherein the sofa base and the backrest are detachably connected via a plug-in assembly, characterized in that, The plug-in assembly includes: A mounting plate, the lower part of which is fixed to the sofa base, and the upper part of which has a positioning hole extending horizontally through the mounting plate; and, The connector includes an integrally formed elastic snap-fit member and a seat body. The seat body is fixed to the side of the backrest. The seat body is provided with a slot that mates with a plug plate. The plug plate is inserted longitudinally into the slot. The elastic snap-fit member extends laterally into the slot and engages with the positioning hole to lock the plug plate with the connector. The elastic snap-fit component is provided with a downwardly inclined first guide surface and an upwardly inclined second guide surface. During the insertion process of the insert plate and the plug-in seat, the insert plate pushes the elastic snap-fit component away through the first guide surface so that the positioning hole is aligned with the elastic snap-fit component. During the disengagement process of the insert plate and the plug-in seat, the insert plate pushes the elastic snap-fit component away through the second guide surface so that the positioning hole is disengaged from the elastic snap-fit component.
2. A sofa according to claim 1, characterized in that: The seat includes a back panel fixed to the backrest, the two sides of the back panel being bent toward each other to form the slot on the side of the back panel away from the backrest.
3. A sofa according to claim 2, characterized in that: The elastic snap-fit component includes a deformable part connected to the back plate at its upper end and a locking part having a first guide surface and a second guide surface. The locking part is located on one side of the lower end of the deformable part to snap into the positioning hole.
4. A sofa according to claim 3, characterized in that: The elastic snap-fit element is a spring sheet, the upper end of which is connected to the back plate to form the deformable part, and the lower end of which is bent twice to form the locking part.
5. A sofa according to claim 2, characterized in that: The back plate is also provided with a clearance hole, which is disposed opposite to the elastic snap fastener so as to avoid the elastic snap fastener when the elastic snap fastener is pushed.
6. A sofa according to claim 5, characterized in that: The back panel is fixed to the backrest by screws. The upper and lower ends of the back panel are respectively provided with countersunk grooves for accommodating screw heads. The countersunk grooves arch towards the backrest to form a clearance gap between the back panel and the backrest that communicates with the clearance hole.
7. A sofa according to claim 1, characterized in that: The insert plate includes a fixing part and a connecting part located at the upper end of the fixing part. The fixing part is fixed to the sofa base by a locking member, and the connecting part is inserted into the slot.
8. A sofa according to claim 7, characterized in that: The upper end of the fixing part is provided with stop steps on both sides of the connecting part. When the connecting part is inserted into the slot, the stop steps abut against the bottom of the insertion seat.
9. A sofa according to claim 7, characterized in that: The connecting part is provided with a plurality of limiting protrusions protruding from the surface of the connecting part. The limiting protrusions abut against the inner wall of the slot to limit the insertion plate laterally.
10. A sofa according to claim 1, characterized in that: The insert plate has a strip-shaped protrusion protruding from the surface of the insert plate in the middle. The strip-shaped protrusion extends longitudinally on the insert plate so that the upper and lower ends of the strip-shaped protrusion are located inside the slot and outside the slot, respectively.