Multifunctional combined sofa bed

Abstract

The invention provides a multifunctional combined sofa bed which comprises a backrest and armrests, limiting connecting pieces are arranged on different end faces of the backrest, a first connecting channel and a second connecting channel are arranged on two adjacent end faces of the armrests, and locking pieces are arranged in the armrests. The locking piece is communicated with the outside through the first connecting channel and the second connecting channel; and the backrest and the armrests form a special structure under the matching of the limiting connecting pieces and the locking pieces so as to meet the assembly requirements in different environments. According to the multifunctional combined sofa bed, the purposes of disassembling and locking can be flexibly achieved through the limiting connecting piece and the locking piece, the rapid locking and unlocking functions are achieved under the cooperation of the protruding block and the sliding block, the connecting strength is large during locking, operation is convenient and fast, the fault rate is low, the efficiency of the assembling process is effectively improved, and the practicability of function transformation of the multifunctional combined sofa bed is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of sofas, and in particular relates to a multifunctional combined sofa bed. Background Art

[0002] A multifunctional sofa bed refers to a piece of furniture that can be used for multiple purposes. It can be placed in the living room or study and serve as a seat. When guests come at night, the multifunctional sofa bed can be unfolded and covered with bedding to become a bed.

[0003] Sofa beds in the prior art are mostly assembled and foldable. The foldable type mainly meets the deformation needs through a rotating shaft hinge structure. Since the rotating function of the rotating shaft and the hinge structure is easily affected when not used for a long time, the operation difficulty increases. The current assembled type has the characteristics of being changeable. In addition to meeting the bed structure, it can also be self-assembled according to needs to meet more diverse needs. However, the current assembled structure adopts a complex limit locking structure, and multiple structures need to be operated during the assembly and disassembly process. The assembly efficiency is low and the failure rate of the complex structure will also be higher. Summary of the invention

[0004] The present invention provides a multifunctional modular sofa bed, aiming to solve the problems that the current assembled structure adopts a complex limit locking structure, the assembly efficiency is low during the assembly and disassembly process, and the failure rate of the complex structure is also higher.

[0005] The present invention is implemented in this way: a multifunctional combined sofa bed comprises:

[0006] A backrest and an armrest, wherein different end surfaces of the backrest are provided with limit connectors, two adjacent end surfaces of the armrest are provided with a first connecting channel and a second connecting channel, and a locking member is inside the armrest, and the locking member is connected to the outside through the first connecting channel and the second connecting channel;

[0007] The limiting connector includes a guide plate and a sliding guide rail; a limiting hole is provided on the end surface of the guide plate, and a limiting block is provided inside the limiting hole; the guide plate extends out of the backrest and is inserted into the armrest to be connected with the limiting connector;

[0008] The locking member includes a first connecting plate, a second connecting plate, a pull rod and a push rod. The end surfaces of the first connecting plate and the second connecting plate are provided with limit columns. The backrest and the armrest are connected by a limit block and a limit column. The pull rod and the push rod push the limit column to break away from the limit of the limit block.

[0009] Preferably, the limiting column comprises a limiting rod, a protrusion and a sliding block. When the protrusion is arranged at one end of the limiting rod, the sliding block slides on the limiting rod, and the end surface of the sliding block away from the protrusion is an inclined surface structure;

[0010] When the guide plate is inserted into the armrest and the limit rod extends into the limit hole, the limit block is engaged between the limit block and the sliding block. When the push rod pushes the limit rod forward, the limit block moves to the side of the sliding block away from the protrusion. When the guide plate moves out, the sliding block extends into the inside of the protrusion, and the limit block slides along the inclined surface of the sliding block and contracts.

[0011] Preferably, a first accommodating cavity and a second accommodating cavity are provided inside the first connecting plate, and the first accommodating cavity and the second accommodating cavity control cavity are connected to each other.

[0012] The push rod extends from the control cavity to the first accommodating cavity and is in contact with and connected to the limiting column; a second limiting ring is provided in the middle section of the push rod, and the second limiting ring slides in the second accommodating cavity. A second spring is provided on the outer side of the push rod, and one end of the second spring is abutted against the second limiting ring, and the other end is abutted against the side of the second accommodating cavity close to the limiting column.

[0013] Preferably, the limiting rod extends away from one end of the protrusion into the first accommodating cavity and is in contact with and connected to the push rod.

[0014] Preferably, a first spring and a first limiting ring are provided on the limiting rod, one end of the first spring abuts against the first limiting ring, and the other end abuts against a side of the first accommodating cavity close to the protrusion.

[0015] Preferably, the first connecting plate and the second connecting plate have the same structure and are vertically connected, a control cavity is provided at the connection between the first connecting plate and the second connecting plate, and the pull rod and the push rod are in contact and connected in the control cavity.

[0016] Preferably, the pull rod is a U-shaped rod, both ends of which extend into the control cavity, and both ends of the U-shaped rod are respectively provided with a first inclined block and a first push block, the first inclined block is in contact and connected with the push rod provided in the second connecting plate, and the first push block is in contact and connected with the push rod provided in the first connecting plate.

[0017] Preferably, the locking member also includes a positioning block, the first connecting plate and the second connecting plate are in two groups, the first connecting plate and the second connecting plate are respectively connected to different end faces of the positioning block, an L-shaped control cavity is provided in the positioning block, the pull rod is a U-shaped rod, and the front end of the pull rod is arranged in the special-shaped control cavity.

[0018] Preferably, a connecting rod is provided at the front end of the pull rod, the connecting rod is perpendicular to the pull rod, two groups of first inclined blocks are provided on the pull rod, two groups of first push blocks are provided on the connecting rod, the first inclined blocks are in contact and connected with the push rod provided in the second connecting plate, and the first push blocks are in contact and connected with the push rod provided in the first connecting plate.

[0019] Preferably, there are two groups of position-limiting connectors on the end surfaces where the backrest is connected to the armrest.

[0020] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0021] 1. The multifunctional modular sofa bed provided by the present invention forms different morphological structures by connecting the backrest and the armrests through the limit connector and the locking member, and utilizes the deformation function to meet the morphological requirements of different environments.

[0022] 2. The multifunctional modular sofa bed provided by the present invention can flexibly achieve the purpose of disassembly and locking through the limit block driven by the protrusion and the sliding block. The protrusion and the sliding block cooperate with each other to have the function of quick locking and unlocking. The connection strength is large when locked, and the operation is convenient and the failure rate is low, which effectively improves the efficiency of the assembly process and enhances the practicality of the functional transformation of the multifunctional modular sofa bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention provides a sofa mode structural schematic diagram of a multifunctional modular sofa bed.

[0024] Figure 2 The present invention provides a multifunctional modular sofa bed.

[0025] Figure 3 The invention discloses a structural schematic diagram of an expanded sofa mode of a multifunctional modular sofa bed.

[0026] Figure 4 The invention discloses a schematic diagram of the structure of the interior of a middle armrest of a multifunctional modular sofa bed.

[0027] Figure 5 The invention discloses a schematic diagram of the surface structure of an armrest of a multifunctional modular sofa bed.

[0028] Figure 6 The invention discloses a locking structure diagram of a multifunctional modular sofa bed.

[0029] Figure 7 The invention provides a schematic diagram of a limiting column structure of a multifunctional modular sofa bed.

[0030] Figure 8 The invention provides a schematic diagram of a limit connection structure of a multifunctional modular sofa bed.

[0031] Fig. 9 The utility model is a schematic diagram of the internal structure of a multifunctional combined sofa bed provided by the present invention.

[0032] Fig.10The invention discloses a schematic structural diagram of a locking member when the first connecting plates in a multifunctional modular sofa bed are a group.

[0033] Fig.11 The present invention is a schematic diagram of a multifunctional modular sofa bed provided by the present invention, in which the front end of the pull rod is not provided with a connecting rod structure.

[0034] Fig.12 The invention discloses a schematic structural diagram of a locking member when the first connecting plates in the multifunctional modular sofa bed are divided into two groups.

[0035] Fig.13 The present invention provides a schematic diagram of a multifunctional combined sofa bed in which a connecting rod is arranged at the front end of a pull rod.

[0036] Description of reference numerals:

[0037] 100, backrest; 200, armrest; 201, armrest frame; 202, armrest soft bag; 210, first connecting channel; 220, second connecting channel; 230, third connecting channel;

[0038] 300, limit connector; 310, limit block; 311, spring; 312, block; 320, guide plate; 321, limit hole; 322, handle; 323, guide slider; 324, limit cavity; 330, sliding rail;

[0039] 400, locking member; 410, first connecting plate; 411, first accommodating cavity; 412, second accommodating cavity; 420, second connecting plate; 430, limiting column; 431, limiting rod; 432, protrusion; 433, sliding block; 434, first spring; 435, first limiting ring; 436, third limiting ring; 440, pulling rod; 441, first inclined block; 442, first pushing block; 450, pushing rod; 451, rod body; 452, second limiting ring; 453, second spring. DETAILED DESCRIPTION

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] The embodiment of the present invention provides a multifunctional modular sofa bed. Figure 1-Figure 13 As shown, the multifunctional modular sofa bed comprises:

[0043] The backrest 100 and the armrest 200 are mainly composed of a frame, a skin, a filling surface, and a spring, etc. The skin and the filling surface form a soft package structure wrapped around the outside of the frame;

[0044] The bottom frame of the backrest 100 is provided with a limiting connector 300 at different end surfaces, and the limiting connector 300 is arranged on the frame, and the limiting connector 300 includes a guide plate 320 and a sliding guide rail 330; the end surface of the guide plate 320 is provided with a limiting hole 321, and a limiting block 310 is arranged inside the limiting hole 321; the sliding guide rail 330 is connected to the frame through a connecting rod, and a sliding channel is provided on the soft bag wrapped on the frame, and the guide plate 320 can extend from the sliding channel to the bottom of the backrest 100;

[0045] The armrest 200 includes an armrest frame 201 and an armrest soft bag 202, wherein the armrest soft bag 202 is wrapped around the outside of the armrest frame 201, and a first connection channel 210, a second connection channel 220, and a third connection channel 230 are provided on the armrest soft bag 202; a locking member 400 is provided inside the armrest 200, and the locking member 400 is communicated with the outside through the first connection channel 210, the second connection channel, and the third connection channel 230;

[0046] The different end surfaces of the backrest 100 are provided with a limiting connector 300, and the limiting connector 300 includes a guide plate 320 and a sliding guide rail 330; the end surface of the guide plate 320 is provided with a limiting hole 321, and a limiting block 310 is provided inside the limiting hole 321; the guide plate 320 extends out of the backrest 100 and is inserted into the armrest 200 to connect with the limiting connector 300; here, the guide plate 320 mainly enters the armrest 200 through the first connecting channel 210 and the second connecting channel 220;

[0047] The locking member 400 includes a first connecting plate 410, a second connecting plate 420, a pull rod 440 and a push rod 450. The first connecting plate 410 and the second connecting plate 420 are respectively located at the ends of the first connecting channel 210 and the second connecting channel 220. The pull rod 440 extends from the third connecting channel 230 into the interior of the armrest 200.

[0048] The end surfaces of the first connecting plate 410 and the second connecting plate 420 are provided with a limiting column 430, and the backrest 100 and the armrest 200 are connected by the limiting block 310 and the limiting column 430; the pull rod 440 and the push rod 450 push the limiting column 430 to break away from the limiting block 310;

[0049] In this embodiment, the armrests 200 are provided in two groups, and the backrests 100 are provided in one group; the front end face and the side end face of the backrest 100 are respectively provided with limiting connectors 300, and the armrest 200 is a rectangular parallelepiped structure consisting of two groups of supporting surfaces, side faces and end faces; the first connecting channel 210 is arranged on one group of supporting surfaces of the armrest 200, and the end face is the first supporting surface 203, and the second connecting channel 220 is arranged on one group of side faces of the armrest 200, and the side face is the first side face 204; and the two side faces and the front end face of the backrest 100 are provided with limiting connectors 300, and the front end face limiting connectors 300 are provided in two groups, which are respectively connected to different armrests 200; the width of the end face is equal to the height of the seat part of the backrest 100, so that there will be no height difference when connecting after deformation;

[0050] The backrest 100 and the armrest 200 have three forms; Figure 1 As shown, in sofa mode, the first support surface 203 is in contact with the ground, and the first side surface 204 is connected to the side surface of the backrest 100; the armrest 200 functions as a side wall armrest;

[0051] like Figure 2 As shown, in the bed body mode, the first support surface 203 of the different armrests 200 is connected to the front end surface of the limiting connector 300, and the first side surface 204 of the armrest 200 faces the ground; the armrest 200 is also connected to the front end surface of the backrest 100 to form a rectangular area for use as a bed body;

[0052] like Figure 3 As shown, in the expanded sofa mode, different armrests 200 are connected to different directions of the backrest 100, and the first side surface 204 of the armrest 200 needs to face the ground. Different armrests 200 are provided with limiting connectors 300 through the first supporting surface 203 and different end surfaces of the backrest 100, forming various special-shaped structures to meet the layout needs;

[0053] In this embodiment, the backrest 100 and the armrest 200 form a special structure under the cooperation of the limiting connector 300 and the locking member 400 to meet the assembly requirements of different environments;

[0054] The limiting column 430 includes a limiting rod 431, a protrusion 432 and a sliding block 433. When the protrusion 432 is arranged at one end of the limiting rod 431, the sliding block 433 slides on the limiting rod 431, and the end surface of the sliding block 433 away from the protrusion 432 is an inclined surface structure;

[0055] When the guide plate 320 is inserted into the armrest 200 and the limit rod 431 extends into the limit hole 321, the limit block 310 is engaged between the limit block 310 and the sliding block 433. The end surface of the limit block 310 close to the sliding block 433 is a plane, and the limit block 310 is not easy to slip off; when the push rod 450 pushes the limit rod 431 forward, the limit block 310 moves to the side of the sliding block 433 away from the protrusion 432. When the guide plate 320 moves out, the sliding block 433 extends into the inside of the protrusion 432, and the limit block 310 slides along the inclined surface of the sliding block 433 and shrinks.

[0056] The limiting block 310 can flexibly realize the purpose of disassembly and locking under the drive of the protrusion 432 and the sliding block 433. In the assembly link, the limiting connector 300 is directly inserted to complete the locking. In the disassembly process, the limiting connector 300 is pulled out again by pushing the sliding block 433 to move twice to complete the separation. The protrusion 432 and the sliding block 433 described here have the functions of locking and unlocking. When locked, the connection strength is large, and the operation is convenient and the failure rate is low, which effectively improves the efficiency of the assembly process, thereby enhancing the practicality of the functional transformation of the multifunctional modular sofa bed; the locking force between the backrest 100 and the armrest 200 mainly utilizes the elastic force between the soft bags to enhance the connectivity, and the backrest 100 and the armrest 200 are tightly fitted by squeezing the soft bags;

[0057] As a preferred implementation in this embodiment, the first connecting plate 410 is provided with a first accommodating cavity 411 and a second accommodating cavity 412, and the first accommodating cavity 411 and the second accommodating cavity 412 are connected to each other.

[0058] The push rod 450 extends from the control cavity to the first accommodating cavity 411 and contacts and connects with the limiting column 430; the push rod 450 includes a rod body 451 and a second limiting ring 452 arranged in the middle section of the rod body 451, the second limiting ring 452 slides in the second accommodating cavity 412, and a second spring 453 is further arranged on the outer side of the rod body 451 of the push rod 450, and the second spring 453 is located in the second accommodating cavity 412; one end of the second spring 453 abuts against the second limiting ring 452, and the other end abuts against the second accommodating cavity 412 near the limiting column 430.

[0059] The end of the limiting rod 431 away from the protrusion 432 extends into the first accommodating cavity 411 and is in contact with the push rod 450; the limiting rod 431 is provided with a first spring 434 and a first limiting ring 435, one end of the first spring 434 abuts against the first limiting ring 435, and the other end abuts against a side of the first accommodating cavity 411 close to the protrusion 432;

[0060] As a preferred implementation in this embodiment, the protrusion 432 is further provided with a receiving groove on the side close to the sliding block 433, and the limiting rod 431 is further provided with a third limiting ring 436; the third limiting ring 436 is located on the portion of the limiting rod 431 extending out of the first receiving cavity 411; when the push rod 450 pushes the limiting rod 431 to extend into the limiting hole 321, the third limiting ring 436 abuts against the sliding block 433, forcing the limiting block 310 to reach the side of the sliding block 433 away from the protrusion 432 from the side of the sliding block 433, and at this time, when the limiting block 310 is connected to the side of the sliding block 433 away from the protrusion 432, the limiting block 310 will be more easily retracted under the action of the inclined surface;

[0061] As a preferred implementation in this embodiment, the two ends of the guide plate 320 are provided with guide sliders 323, and the guide sliders 323 slide on the sliding guide rails 330. The end of the track of the sliding guide rails 330 is provided with electromagnets 340.

[0062] In this embodiment, when the guide slider 323 slides to the end of the track, the electromagnet 340 generates a magnetic attraction effect, and the guide slider 323 is magnetically connected to the electromagnet 340. The magnetic limiter here helps the guide plate 320 to be fixed and maintained, and will not shrink back into the backrest 100 during the insertion process. After the connection is completed, the electromagnet 340 can release the magnetic attraction, and the subsequent maintenance and disassembly do not require the guide plate 320 to remain in a fixed state;

[0063] In this embodiment, the handle 322 provided on the guide plate 320 is used to help move and pull the guide plate 320; the way of setting the limit connector 300 on the backrest 100 is also to use the frame to fix the limit connector 300 and then open a channel on the soft bag to accommodate the movement of the guide plate 320. When operating, put your hand into the soft bag channel to pull out the guide plate 320, and push it into the soft bag when it is not needed;

[0064] A limiting cavity 324 is provided in the limiting hole 321, and the limiting cavity 324 is communicated with the limiting hole 321. The limiting block 310 includes a spring 311 and a block 312. One end of the spring 311 abuts against the inside of the limiting cavity 324 and the other end abuts against the block 312. The block 312 extends from the inside of the limiting cavity 324 to the limiting hole 321. A baffle is also provided at the connection between the limiting cavity 324 and the limiting hole 321. A limiting ring is provided at one end of the block 312 connected to the spring 311 and abuts against the baffle to prevent the block 312 from slipping off.

[0065] In a further preferred embodiment of the present invention, the first connecting plate 410 and the second connecting plate 420 have the same structure and are vertically connected, a control cavity is provided at the connection between the first connecting plate 410 and the second connecting plate 420, and the pull rod 440 and the push rod 450 are in contact and connection in the control cavity;

[0066] In this embodiment, the pull rod 440 is a U-shaped rod, and both ends of the U-shaped rod extend into the control cavity. Both ends of the U-shaped rod are respectively provided with a first inclined block 441 and a first push block 442. The first inclined block 441 is in contact with and connected to a push rod 450 provided in the second connecting plate 420, and the first push block 442 is in contact with and connected to a push rod 450 provided in the first connecting plate 410. The first inclined block 441 adopts an inclined surface structure to complete the lifting of the push rod 450.

[0067] In a further preferred embodiment of the present invention, the locking member 400 further includes a positioning block, the first connecting plate 410 and the second connecting plate 420 are in two groups, and the first connecting channel 210 and the second connecting channel 220 are also in two groups, the first connecting plate 410 and the second connecting plate 420 are respectively connected to different end surfaces of the positioning block, and an L-shaped control cavity is provided in the positioning block;

[0068] The pull rod 440 is a U-shaped rod, and a connecting rod is provided at the front end of the pull rod 440. The connecting rod is perpendicular to the pull rod 440. The front end of the pull rod 440 and the connecting rod are both located in the L-shaped control cavity.

[0069] The pull rod 440 is provided with two groups of first inclined blocks 441, and the connecting rod is provided with two groups of first push blocks 442. The first inclined blocks 441 are in contact with and connected to the push rod 450 provided in the second connecting plate 420, and the first push blocks 442 are in contact with and connected to the push rod 450 provided in the first connecting plate 410.

[0070] In this embodiment, the number of the position-limiting connectors 300 at the end surface where the backrest 100 and the armrest 200 are connected is two groups, and the double structure is used to enhance the stability of the structure;

[0071] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A multifunctional modular sofa bed, characterized in that: include: A backrest (100) and an armrest (200), wherein different end surfaces of the backrest (100) are provided with limiting connectors (300), two adjacent end surfaces of the armrest (200) are provided with a first connecting channel (210) and a second connecting channel (220), and a locking member (400) is provided inside the armrest (200), and the locking member (400) is connected to the outside through the first connecting channel (210) and the second connecting channel; The limiting connecting member (300) comprises a guide plate (320) and a sliding guide rail (330); a limiting hole (321) is provided on the end surface of the guide plate (320), and a limiting block (310) is provided inside the limiting hole (321); the guide plate (320) extends out of the backrest (100) and is inserted into the armrest (200) to be connected with the limiting connecting member (300); The locking member (400) comprises a first connecting plate (410), a second connecting plate (420), a pull rod (440) and a push rod (450); the end surfaces of the first connecting plate (410) and the second connecting plate (420) are provided with a limiting column (430); the backrest (100) and the armrest (200) are connected by a limiting block (310) and a limiting column (430); the pull rod (440) and the push rod (450) push the limiting column (430) to break away from the limitation of the limiting block (310).

2. A multifunctional modular sofa bed as claimed in claim 1, characterized in that: The limiting column (430) comprises a limiting rod (431), a protrusion (432) and a sliding block (433); when the protrusion (432) is arranged at one end of the limiting rod (431), the sliding block (433) slides on the limiting rod (431), and the end surface of the sliding block (433) away from the protrusion (432) is an inclined surface structure; When the guide plate (320) is inserted into the armrest (200), the limiting rod (431) extends into the limiting hole (321), and the limiting block (310) is engaged between the limiting block (310) and the sliding block (433). When the push rod (450) pushes the limiting rod (431) forward, the limiting block (310) moves to the side of the sliding block (433) away from the protrusion (432). When the guide plate (320) moves out, the sliding block (433) extends into the protrusion (432), and the limiting block (310) slides along the inclined surface of the sliding block (433) and shrinks.

3. A multifunctional modular sofa bed as claimed in claim 2, characterized in that: A first accommodating cavity (411) and a second accommodating cavity (412) are provided inside the first connecting plate (410), and the first accommodating cavity (411) and the second accommodating cavity (412) are connected to each other. The push rod (450) extends from the control cavity to the first accommodating cavity (411) and is in contact with and connected to the limiting column (430); a second limiting ring (452) is provided in the middle section of the push rod (450), and the second limiting ring (452) slides in the second accommodating cavity (412); a second spring (453) is provided on the outside of the push rod (450), and one end of the second spring (453) is abutted against the second limiting ring (452), and the other end is abutted against the side of the second accommodating cavity (412) close to the limiting column (430).

4. The multifunctional modular sofa bed according to claim 3, characterized in that: One end of the limiting rod (431) away from the protrusion (432) extends into the first accommodating cavity (411) and contacts and connects with the push rod (450).

5. The multifunctional modular sofa bed according to claim 4, characterized in that: The limiting rod (431) is provided with a first spring (434) and a first limiting ring (435); one end of the first spring (434) abuts against the first limiting ring (435), and the other end abuts against a side of the first accommodating cavity (411) close to the protrusion (432).

6. The multifunctional modular sofa bed according to claim 5, characterized in that: The first connecting plate (410) and the second connecting plate (420) have the same structure and are vertically connected. A control cavity is provided at the connection between the first connecting plate (410) and the second connecting plate (420), and the pull rod (440) and the push rod (450) are contact-connected in the control cavity.

7. The multifunctional modular sofa bed according to claim 6, characterized in that: The pull rod (440) is a U-shaped rod, and both ends of the U-shaped rod extend into the control cavity. The two ends of the U-shaped rod are respectively provided with a first inclined block (441) and a first push block (442). The first inclined block (441) is in contact and connected with a push rod (450) provided in the second connecting plate (420), and the first push block (442) is in contact and connected with a push rod (450) provided in the first connecting plate (410).

8. The multifunctional modular sofa bed according to claim 5, characterized in that: The locking member (400) further includes a positioning block, the first connecting plate (410) and the second connecting plate (420) are provided in two groups, the first connecting plate (410) and the second connecting plate (420) are respectively connected to different end faces of the positioning block, an L-shaped control cavity is provided in the positioning block, the pull rod (440) is a U-shaped rod, and the front end of the pull rod (440) is provided in the special-shaped control cavity.

9. The multifunctional modular sofa bed according to claim 8, characterized in that: A connecting rod is provided at the front end of the pull rod (440), and the connecting rod is perpendicular to the pull rod (440). Two groups of first inclined blocks (441) are provided on the pull rod (440), and two groups of first push blocks (442) are provided on the connecting rod. The first inclined blocks (441) are in contact and connected with a push rod (450) provided in the second connecting plate (420), and the first push block (442) is in contact and connected with a push rod (450) provided in the first connecting plate (410).

10. The multifunctional modular sofa bed according to claim 9, characterized in that: The number of the position-limiting connectors (300) on the end surfaces connecting the backrest (100) and the armrest (200) is two groups.

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