Detachable sofa

Abstract

The utility model provides a detachable sofa which comprises a mechanical stretching device and two armrest pieces arranged on the left side and the right side of the mechanical stretching device, the mechanical stretching device comprises a frame serving as a main body support, the frame comprises two armrest frames, left-right through mounting holes are formed in the armrest frames, positioning pieces on the armrest pieces are inserted into the mounting holes, and the mechanical stretching device can stretch out of the frame. The positioning piece is exposed towards the interior of the mechanical stretching device, and then the positioning piece is locked in the mounting hole through the locking piece, so that detachable connection of the armrest piece and the armrest frame is completed; the connection mode of the armrest piece and the armrest frame is simple, the armrest does not need to be used as a main body support of the sofa and can be assembled on the frame more conveniently, and only the locking piece needs to be mounted after the positioning piece is inserted into the mounting hole.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a detachable sofa. Background Art

[0002] In the existing electric sofa, the state switching of the sofa is realized by a mechanical extension device, which can generally realize a sitting state for a user and a lying state for a user. Therefore, the mechanical extension device is the core skeleton and an indispensable assembly for this electric sofa; in this type of electric sofa, armrests are often installed on the left and right sides of the mechanical extension device, which not only covers the mechanical extension device to maintain the appearance, but also provides a place for the user to place his arms.

[0003] However, in this type of electric sofa, the armrests are generally made of wooden frames. During the production and assembly process, the installation of the armrests and the mechanical extension device is relatively complicated. In addition, due to the complex internal structure of the mechanical extension device, the assembly of the armrests is also difficult. Some electric sofas even have only armrests that touch the ground, so the armrests are the main support of the sofa. The connection strength and stability between the armrests and the mechanical extension device must be good enough to ensure that the connection between the mechanical extension device and the armrests will not be damaged due to shear stress and the mechanical extension device and the armrests will not disintegrate under long-term use.

[0004] Furthermore, if the armrests are assembled by the manufacturer, the packaging and transportation costs at the time of delivery will increase, while if the armrests are assembled by the consumer, it will be more difficult, which will reduce the consumer's installation experience. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the utility model provides a detachable sofa, including a mechanical extension device and two armrest members arranged on the left and right sides thereof, the mechanical extension device including a frame as a main body support, the frame including two armrest frames, the armrest frames are provided with left and right through mounting holes, the positioning piece on the armrest piece is inserted into the mounting hole, the positioning piece is exposed to the inside of the mechanical extension device, and then the positioning piece is locked in the mounting hole with a locking piece to complete the detachable connection between the armrest piece and the armrest frame; the connection method between the armrest piece and the armrest frame is simple, the armrest does not need to be the main body support of the sofa, it is more convenient to assemble it to the frame, and the locking piece only needs to be installed after the positioning piece is inserted into the mounting hole.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A detachable sofa comprises a mechanical extension device and two armrest members symmetrically arranged on both sides of the mechanical extension device, the mechanical extension device comprises a frame as a main body support, the frame comprises two armrest frames symmetrically arranged on the left and right, the armrest frames are provided with mounting holes that pass through the armrest frames on the left and right; the armrest members are provided with positioning members, the positioning members are inserted in the mounting holes and exposed from the armrest frames toward the inside of the mechanical extension device, and the positioning members exposed from the armrest frames are provided with locking members, and the locking members are configured to lock the positioning members in the mounting holes and enable the armrest members to be mounted on the armrest frames.

[0008] The frame serving as the main support includes an armrest frame for installing the armrest. The overall structure is simplified by integrating the armrest frame into the frame, laying the foundation for simple and quick assembly. When the armrest is installed on the armrest frame, it is only necessary to insert the positioning piece on the armrest into the mounting hole, and then install the locking piece on the positioning piece, without the need for complicated operations such as screwing, and even consumers can complete it easily. Therefore, the disassembly and assembly of the armrest is realized to reduce the cost of packaging and transportation, and it is convenient for consumers to assemble the sofa.

[0009] Preferably, the armrest member includes a vertical mounting portion and a laterally extending supporting portion, the supporting portion is located at the upper end of the mounting portion, the supporting portion is configured to support a human arm, the mounting portion is configured to be connected to the armrest frame, and the positioning member is disposed on the mounting portion. In order to further facilitate the installation of the armrest member, the thickness and volume of the armrest member will be smaller than that of the existing armrest member, such as the thickness of the mounting portion is only 6-9 mm; and because the thickness of the mounting portion is small and cannot support a human arm, a supporting portion is also required to be provided, and the shape of the supporting portion can be designed in a variety of ways, but the supporting portion needs to extend laterally in the left and right directions to widen the maximum width of the supporting portion, so as to be suitable for supporting the user's arm.

[0010] Preferably, there are three positioning members and three mounting holes, and the three positioning members are arranged in a triangle, and two of the positioning members are located at the lower part of the armrest, and one positioning member is located in the middle part of the armrest. The number of positioning members and mounting holes is three, which is not too many and will not make the installation complicated. At the same time, the three positioning members are arranged in a triangle, which can increase the connection strength and stability of the armrest installation.

[0011] Preferably, the handrail frame includes a first longitudinal rod, a second longitudinal rod, a first vertical rod and a second vertical rod, the first longitudinal rod is located above the second longitudinal rod, the first vertical rod is located in front of the second vertical rod, the front and rear ends of the first longitudinal rod are fixedly connected to the upper ends of the first vertical rod and the second vertical rod, and the front and rear ends of the second longitudinal rod are fixedly connected to the lower ends of the first vertical rod and the second vertical rod; a mounting hole is provided in the middle of the first longitudinal rod, and a mounting hole is provided at the front end and the rear end of the second longitudinal rod. In this solution, the specific positions of the mounting holes are as follows: one mounting hole is provided on the first longitudinal rod located at the upper part of the handrail frame, and two mounting holes are provided on the second longitudinal rod located at the lower part of the handrail frame, thereby forming a triangular arrangement to increase the connection strength and stability of the handrail installation.

[0012] Preferably, the mechanical extension device further comprises a motion unit, which is arranged in the frame and connected to the upper end of the frame; the motion unit comprises a back connector, a footrest connector, a footrest motion assembly and a connecting rod, wherein the back connector is configured to connect to the backrest, and the footrest connector is configured to connect to the footrest; the back connector is rotatably arranged at the rear end of the frame; one end of the footrest motion assembly is rotatably connected to the front end of the frame, and the other end of the footrest motion assembly is rotatably connected to the footrest connector; the connecting rod is arranged in the front-to-back direction, and the front and rear ends of the connecting rod are rotatably connected to the footrest motion assembly and the back connector, respectively. The motion unit structure is simple enough to leave a large enough space for consumers to put their hands into the mechanical extension unit to install the locking member.

[0013] Preferably, the mounting portion includes a plate and leather wrapped around the plate. The plate may be a wooden board, and the leather is used to increase the comfort of the armrest and improve the appearance of the armrest, thereby reducing the cost of the armrest.

[0014] Preferably, the thickness of the mounting portion is 6-9 mm. Compared with the armrests in traditional sofas, the mounting portion is thinner and lighter, which is convenient for consumers to install, and also saves the cost of materials and packaging and transportation.

[0015] Preferably, the positioning member is a bolt and the locking member is a butterfly nut. With this solution, there is no need to design new positioning members and locking members, and the handrail member can be installed using existing parts, which reduces costs and is simple and convenient to implement.

[0016] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0017] The frame serving as the main support includes an armrest frame for installing the armrest. The overall structure is simplified by integrating the armrest frame into the frame, laying the foundation for simple and quick assembly. When the armrest is installed on the armrest frame, it is only necessary to insert the positioning piece on the armrest into the mounting hole, and then install the locking piece on the positioning piece, without the need for complicated operations such as screwing, and even consumers can complete it easily. Therefore, the disassembly and assembly of the armrest is realized to reduce the cost of packaging and transportation, and it is convenient for consumers to assemble the sofa. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the sofa in a sitting posture when the utility model is used in an embodiment;

[0019] Figure 2 It is a front view of the sofa in a sitting posture when the utility model is used in an embodiment;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the sofa in the packaging state in the embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the sofa after removing the back cushion in the packaging state of the utility model in the embodiment;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the back frame installed on the mechanical extension device in the embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the mechanical stretching device in the embodiment of the utility model;

[0024] Figure 7 It is a schematic diagram of the internal space division of the mechanical stretching device in the embodiment of the utility model;

[0025] Figure 8 It is a three-dimensional structural schematic diagram of the frame in the embodiment of the utility model;

[0026] Fig. 9 It is a schematic diagram of the three-dimensional structure of the back frame in the embodiment of the utility model;

[0027] Fig.10 It is a three-dimensional structural schematic diagram of the mechanical extension device and the back frame in the sofa in the lying posture in the use state of the utility model in the embodiment;

[0028] Fig.11 This is a schematic diagram of the handrail member installed on the handrail frame in an embodiment of the utility model;

[0029] Fig.12This is a schematic diagram of the armrest member and the armrest frame when they are separated in the embodiment of the present invention.

[0030] The reference numerals of the drawings are as follows: footrest 1; seat 2; backrest 3; back frame 31; cushion 32; armrest 4; mounting portion 41; supporting portion 42; frame 5; seat frame 501; armrest frame 502; first cross bar 51; second cross bar 52; first left longitudinal bar 53; first right longitudinal bar 54; first left vertical bar 55; second left vertical bar 56; second left longitudinal bar 57; first right vertical bar 58; second right vertical bar 59; second right longitudinal bar 510; first connecting bar 511; second connecting bar 512; footrest connecting member 6 ; back connector 7; insert 71; connecting rod 8; linkage member 9; first mounting member 10; second mounting member 11; first footrest connecting rod 12; second footrest connecting rod 13; third footrest connecting rod 14; fourth footrest connecting rod 15; mounting auxiliary member 16; connecting portion 161; mounting rod 162; accommodating space 17; occupied space 18; connector 19; slot 20; block seat 21; elastic paddle 22; locking hole 23; mounting hole 24; positioning member 25; locking member 26; supporting foot 27; actuator 28. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0034] The specific implementation of the utility model is as follows:

[0035] like Figure 1-4As shown, the utility model provides a sofa for improving space utilization during packaging, the sofa comprises a mechanical extension device, a footrest 1, a seat 2, a backrest 3 and two armrests 4 symmetrically arranged on both sides of the mechanical extension device, the footrest 1 is arranged at the front side of the mechanical extension device, the seat 2 is arranged at the upper part of the mechanical extension device, and the backrest 3 is arranged at the rear end of the mechanical extension device; the sofa has a packaging state and a use state, and the sofa has a sitting posture and a lying posture in the use state, and is used for packaging and transportation in the packaging state; the footrest 1 is configured to support the legs and feet of a human body when the sofa is in a lying posture, the seat 2 is configured to support the buttocks of a human body, the backrest 3 is configured to support the back of a human body, and the armrests 4 are configured to support the arms of a human body.

[0036] like Figure 5-8 As shown, the mechanical extension device comprises:

[0037] The frame 5 is configured as the main body support of the mechanical stretching device; the frame 5 includes a seat frame 501 for mounting the seat portion 2, and the seat frame 501 is located at the upper end of the frame 5;

[0038] Two motion units are symmetrically arranged on the frame 5, and the two motion units are suspended on the seat frame 501; the motion unit includes a footrest motion assembly, a footrest connecting piece 6, a back connecting piece 7 and a connecting rod 8, the footrest connecting piece 6 is configured to connect the footrest piece 1, the back connecting piece 7 is configured to connect the backrest 3, the footrest motion assembly is configured to drive the footrest connecting piece 6 to move, and the connecting rod 8 is configured to link the footrest motion assembly with the back connecting piece 7; one end of the footrest motion assembly is rotatably connected to the seat frame 501, and the other end of the footrest motion assembly is rotatably connected to the footrest connecting piece 6; the back connecting piece 7 is rotatably connected to the seat frame 501, and the front and rear ends of the connecting rod 8 are rotatably connected to the footrest motion assembly and the back connecting piece 7 respectively;

[0039] A linkage member 9 is arranged between the two motion units, and the left and right ends of the linkage member 9 are respectively connected to the two motion units;

[0040] The actuator 28 has its front and rear ends respectively mounted on the frame 5 and the linkage 9, and the actuator 28 is configured to drive the motion unit to move.

[0041] The frame 5 serves as a supporting body to replace the substrate or base at the bottom of the traditional mechanical extension device. At the same time, the frame 5 also integrates the seat frame 501 therein, reducing the connecting rod 8 and components required for the seat frame 501 and its movement in the traditional mechanical extension device; in addition to the necessary footrest connector 6 and back connector 7, the motion unit only has a footrest motion component and a connecting rod 8. Under the premise of ensuring that the mechanical extension device can move so that the sofa can be used for users to sit and lie down, the rods in the motion unit are greatly reduced, the mechanical extension device is simplified to the greatest extent, thereby reducing the material and assembly costs of production.

[0042] Moreover, the frame 5 serves as the supporting body, enabling the moving unit not to be necessarily connected downward to the lower part of the mechanical extension device, leaving space below the moving unit; that is, the frame 5 provides the main support, the seat frame 501 remains stationary with the ground as a part of the frame 5, the moving unit is suspended on the frame 5 and not connected to the lower end of the frame 5. And since the moving unit is suspended on the seat frame 501, a large space is left in the frame 5, which can be used to place other components of the sofa and be packaged together to reduce the cost of packaging and transportation.

[0043] Specifically, the frame 5 further includes armrest frames 502 located on the left and right sides. The two armrest frames 502 are vertically arranged, and the seat frame 501 is horizontally arranged. The two moving units are located between the two armrest frames 502; the armrest frames 502 are configured to install the armrest members 4; the frame 5 also integrates the armrest frames 502 together, and the effect and utilization efficiency of the frame 5 are higher than those of the base in the traditional mechanical extension device.

[0044] Furthermore, the frame 5 is a cuboid frame 5 structure, including a first cross bar 51, a second cross bar 52, a first left longitudinal bar 53, a first right longitudinal bar 54, a first left vertical bar 55, a second left vertical bar 56, a second left longitudinal bar 57, a first right vertical bar 58, a second right vertical bar 59, and a second right longitudinal bar 510; the seat frame 501 includes the first cross bar 51, the second cross bar 52, the first left longitudinal bar 53, and the first right longitudinal bar 54; the armrest frame 502 on the left side includes the first left longitudinal bar 53, the first left vertical bar 55, the second left vertical bar 56, and the second left longitudinal bar 57, and the armrest frame 502 on the right side includes the first right longitudinal bar 54, the first right vertical bar 58, the second right vertical bar 59, and the second right longitudinal bar 510; the first cross bar 51 is located in front of the second cross bar 52, and the left and right ends of the first cross bar 51 are fixedly connected to the front ends of the first left longitudinal bar 53 and the first right longitudinal bar 54. The left and right ends of the second cross bar 52 are fixedly connected to the rear ends of the first left longitudinal bar 53 and the first right longitudinal bar 54; the first left vertical bar 55 is located in front of the second left vertical bar 56, and the front and rear ends of the first left longitudinal bar 53 are respectively fixedly connected to the upper ends of the first left vertical bar 55 and the second left vertical bar 56. The front and rear ends of the second left longitudinal bar 57 are respectively fixedly connected to the lower ends of the first left vertical bar 55 and the second left vertical bar 56. Similarly, the first right vertical bar 58 is located in front of the second right vertical bar 59, and the front and rear ends of the first right longitudinal bar 54 are respectively fixedly connected to the upper ends of the first right vertical bar 58 and the second right vertical bar 59. The front and rear ends of the second right longitudinal bar 510 are respectively fixedly connected to the lower ends of the first right vertical bar 58 and the second right vertical bar 59; the frame 5 is a cuboid frame 5 structure, different from the flat base in the traditional mechanical extension device. The three-dimensional frame 5 can form the seat frame 501 and the armrest frames 502 to facilitate the installation of the seat part 2 and the armrest members 4.

[0045] The frame 5 also includes a first connecting rod 511 and a second connecting rod 512, the first connecting rod 511 is located on the front side of the second connecting rod 512; the left and right ends of the first connecting rod 511 are fixedly connected to the lower ends of the first left vertical rod 55 and the second left vertical rod 56 respectively; the left and right ends of the second connecting rod 512 are fixedly connected to the second left vertical rod 56 and the second right vertical rod 59 respectively; the rear end of the actuator 28 is rotatably connected to the second connecting rod 512, and the front end of the actuator 28 is rotatably connected to the linkage 9; the two connecting rods can further connect the left and right armrest frames 502, so as to strengthen the strength of the frame 5, and the actuator 28 is an electric push rod.

[0046] Furthermore, a first mounting member 10 is provided at the front end of the seat frame 501, and a second mounting member 11 is provided at the rear end of the seat frame 501; the footrest motion assembly is rotatably connected to the first mounting member 10, and the back connecting member 7 is rotatably connected to the second mounting member 11; the seat frame 501 is used to connect the seat 2, and the first mounting member 10 and the second mounting member 11 can allow the connection point of the back connecting member 7 and the footrest motion assembly to avoid the connection position of the seat 2, thereby not affecting the installation of the seat 2 on the seat frame 501; the first mounting member 10 and the second mounting member 11 are plates.

[0047] Specifically, the footrest movement assembly includes a first footrest link 12, a second footrest link 13, a third footrest link 14 and a fourth footrest link 15. The first footrest link 12 is located behind the second footrest link 13, and the upper end of the first footrest link 12 and the upper end of the second footrest link 13 are both rotatably connected to the first mounting member 10; the rear end of the third footrest link 14 is rotatably connected to the lower end of the first footrest link 12, the rear end of the fourth footrest link 15 is rotatably connected to the lower end of the second footrest link 13, and the middle part of the third footrest link 14 is rotatably connected to the middle part of the second footrest link 13; the front end of the third footrest link 14 is rotatably connected to the rear end of the footrest connector 6, and the front end of the fourth footrest link 15 is rotatably connected to the front part of the footrest connector 6; the footrest movement assembly includes four connecting rods 8, which form a scissor hand form to realize the retraction and extension of the footrest connector 6, and the structure is simpler than the traditional mechanical extension device.

[0048] The connecting rod 8 is arranged in the front-to-back direction, the front end of the back connecting member 7 is rotatably connected to the second mounting member 11, and the rear end of the back connecting member 7 is rotatably connected to the rear end of the connecting rod 8; when the footrest motion assembly drives the footrest connecting member 6 forward, the connecting rod 8 moves forward and drives the rear end of the back connecting member 7 forward, so that the back connecting member 7 rotates backward, thereby realizing the lying posture of the sofa footrest extending forward and the backrest 3 leaning back; the front end of the connecting rod 8 is rotatably connected to one of the first footrest connecting rod 12, the second footrest connecting rod 13, the third footrest connecting rod 14 or the fourth footrest connecting rod 15, and the linkage member 9 is fixedly connected to one of the first footrest connecting rod 12, the second footrest connecting rod 13, the third footrest connecting rod 14 or the fourth footrest connecting rod 15. In this embodiment, considering the length of the connecting rod 8 and the length of the actuator 28, it is more appropriate to set the connecting rod 8 and the linkage member 9 on the first footrest connecting rod 12, which can minimize the length of the connecting rod 8 and the actuator 28, thereby reducing the cost.

[0049] Regarding the installation of the seat 2: Figure 6-8 As shown, an installation auxiliary component 16 is provided under the seat frame 501, and the installation auxiliary component 16 is provided under the first cross bar 51, the second cross bar 52, the first left longitudinal bar 53, and the first right longitudinal bar 54; the installation auxiliary component 16 includes connecting parts 161 at the front and rear ends and a mounting rod 162 located between the connecting parts 161, and there is a gap between the mounting rod 162 and the seat frame 501, and the installation auxiliary component 16 is configured to fix the seat 2 on the seat frame 501; when installing, after the edge of the seat 2 is wrapped around the mounting rod 162, the edge of the seat 2 is clamped on the mounting rod 162 with a C-shaped nail to complete the installation of the seat 2; and in the use state and the packaging state, the seat 2 is installed on the mechanical extension device; when the consumer receives the sofa, there is no need to install the seat 2, which simplifies the installation steps.

[0050] Regarding the packaging and installation of the backrest 3: Further, as Figure 1-10As shown, the mechanical extension device has a storage space 17 that opens downward and / or backward. In the packaged state, the backrest 3 is placed in the storage space 17 of the mechanical extension device. By leaving enough storage space 17 for the backrest 3 in the mechanical extension device, the backrest 3 can enter the storage space 17 in the packaged state. When packaging, the packaging volume is relative to the volume occupied by the mechanical extension device alone. During transportation, it can also be arranged more compactly, and there is no need to additionally package the backrest 3, thereby reducing the cost of packaging and transportation. When consumers receive the After that, the sofa can be put into use by simply installing the backrest 3 to the rear end of the mechanical extension device, and the assembly is simple and convenient; in the packaged state, the backrest 3 can be placed into the accommodating space 17 from bottom to top or from back to front, and it is also convenient to place the backrest 3 into the accommodating space 17, which is further conducive to packaging and transportation; in this embodiment, although the accommodating space 17 is open downward and backward on the mechanical extension device due to the position of the second connecting rod 512, the rear of the mechanical extension device is blocked by the cloth cover, so when packaging, the backrest 3 can be stuffed into the accommodating space 17 from bottom to top, specifically:

[0051] In the sitting posture, the footrest motion assembly is retracted in the frame 5; in the lying posture, the footrest motion assembly extends outward from the frame 5; an overall space is formed in the frame 5, and the overall space includes an occupied space 18 and the accommodating space 17. In the packaged state, the sofa is in the sitting posture, the motion unit is in the occupied space 18, and the backrest 3 is in the accommodating space 17; in the overall space of the frame 5, in addition to the occupied space 18 occupied by the motion unit, there is also the accommodating space 17 for placing the backrest 3 in the packaged state, so the overall space is the internal space in the traditional mechanical extension device, and the accommodating space 17 is not the internal space in the traditional mechanical extension device. The existence of the accommodating space 17 enables the backrest 3 to be placed therein, which is a feature that the traditional mechanical extension device does not have; and the motion unit is suspended on the frame 5, and the motion unit is located as a whole at the upper part of the overall space, and the frame 5 leaves the accommodating space 17 below the motion unit; and the structure of the motion unit is simple enough to leave a sufficiently large accommodating space 17 vacant.

[0052] The accommodating space 17 is located between the two armrest frames 502, and the first connecting member and the second connecting member connect the two armrest frames 502. In the height direction, the second connecting rod 512 is arranged in the middle of the second left vertical rod 56 and the second right vertical rod 59. The second connecting rod 512 is not arranged at the lower end of the second left vertical rod 56 and the second right vertical rod 59, but is located in the middle of the two. In this way, after the accommodating space 17 is formed between the two armrest frames 502, the position of the second connecting rod 512 can avoid the backrest 3 placed in the accommodating space 17.

[0053] The second connecting rod 512 is 100-120 mm higher than the lower surface of the armrest frame 502. In the present embodiment, the second connecting rod 512 is 108 mm higher than the lower surface of the armrest frame 502. The second connecting rod 512 has a certain height relative to the bottom of the armrest frame 502, so that the lower rear portion of the frame 5 can be opened. Due to the opening and the avoidance of the second connecting rod 512, the backrest 3 can be placed in the accommodating space 17 more conveniently and easily in the packaged state without being blocked by the second connecting rod 512, thereby improving the space utilization during packaging and transportation and reducing the packaging and transportation costs.

[0054] Furthermore, the lowermost end of the connecting rod 8 is at a height higher than the second connecting rod 512 , and the lowermost end of the back connecting member 7 is at a height higher than the second connecting rod 512 . The positions of the connecting rod 8 and the back connecting member 7 ensure that the back connecting member 7 does not affect the placement of the backrest 3 into the accommodating space 17 .

[0055] The back connector 7 includes a plug-in piece 71, a plug-in piece 19 is provided on the backrest 3, and a slot 20 is provided on the plug-in piece 19. When in use, the plug-in piece 71 is plugged and matched with the plug-in piece 19; specifically, a stopper 21 is provided at the upper end of the plug-in piece 19, and an elastic paddle 22 extends from the lower end of the stopper 21. A locking hole 23 is provided on the plug-in piece 71. When in use, the plug-in piece 71 is plugged with the plug-in piece 19, and the elastic paddle 22 is inserted into the locking hole 23; the backrest 3 and the back connector 7 are connected by plugging and matching the plug piece 71 with the plug connector 19, and the installation method is convenient and simple, which is convenient for the user to change the sofa from the packaging state to the use state after receiving it; the blocking seat 21 can prevent the plug piece 71 from exceeding the top of the plug connector 19, ensuring the success rate of the connection between the plug connector 19 and the plug piece 71; after the plug connector 19 is plugged with the plug piece 71, the locking is completed by the elastic paddle 22 and the locking hole 23, so that the connection between the backrest 3 and the back connector 7 is more stable.

[0056] In addition, the backrest 3 includes a back frame 31 and a soft cushion 32 wrapped around the back frame 31, the soft cushion 32 is elastic, and the size of the back frame 31 is smaller than the size of the accommodating space 17; since the soft cushion 32 is elastic, even if the volume of the soft cushion 32 is larger than the volume of the accommodating space 17, the soft cushion 32 can still be squeezed and stuffed into the accommodating space 17.

[0057] About the packaging and installation of the handrail:

[0058] like Figure 1-8As shown in , 11 and 12, the two armrests 4 are detachably connected to the mechanical extension device. In the use state, the two armrests 4 are installed on the mechanical extension device; in the packaging state, the two armrests 4 are stacked on the mechanical extension device; the armrests 4 are used to support human arms. In the packaging state, the armrests 4 can also be removed from the mechanical extension device and stacked on the mechanical extension device, thereby reducing the space occupied in the left and right directions during packaging. Specifically:

[0059] The armrest member 4 includes a vertical mounting portion 41 and a supporting portion 42 extending laterally outward from the sofa, wherein the supporting portion 42 is located at the upper end of the mounting portion 41, and the supporting portion 42 is configured to support a human arm, and the mounting portion 41 is configured to be connected to the armrest frame 502; in the packaged state, the mounting portion 41 is located above the mechanical extension device, and the supporting portion 42 is located at the side of the mechanical extension device; in order to support the human arm, the width of the supporting portion 42 is slightly wider. If the armrest member 4 is not removed in the packaged state, the supporting portion 42 will occupy more space in the left and right directions. After the armrest member 4 is stacked on the mechanical extension device, the mounting portion 41 is located above the mechanical extension device, and the supporting portion 42 is located at the side of the mechanical extension device, which can further reduce the packaging volume and reduce the packaging and transportation costs.

[0060] Furthermore, a mounting hole 24 is provided on the armrest frame 502, which passes through the armrest frame 502 from left to right; a positioning piece 25 is provided on the armrest member 4, and the positioning piece 25 is inserted in the mounting hole 24 and exposed from the armrest frame 502 toward the inside of the mechanical extension device, and a locking piece 26 is provided on the positioning piece 25 exposed from the armrest frame 502, and the locking piece 26 is configured to lock the positioning piece 25 in the mounting hole 24 and enable the armrest member 4 to be installed on the armrest frame 502; that is, in the use state, the positioning piece 25 is inserted in the mounting hole 24 and protrudes toward the inside of the mechanical extension device, and the locking piece 26 is tightened on the positioning piece 25 to lock the mounting portion 41 on the mechanical extension device; this scheme is used for the rapid disassembly and assembly of the armrest member 4, simplifies the disassembly and assembly operation, and reduces the difficulty of disassembly and assembly; the simple internal structure of the mechanical extension device also makes the installation of the armrest member 4 more convenient.

[0061] The overall structure is simplified by integrating the armrest frame 502 into the frame 5, laying the foundation for simple and quick assembly; when the armrest member 4 is installed on the armrest frame 502 frame 5, it is only necessary to insert the positioning member 25 on the armrest member 4 into the mounting hole 24, and then install the locking member 26 on the positioning member 25, without the need for complicated operations such as screwing screws, and even consumers can easily complete the task; therefore, the disassembly and assembly of the armrest member 4 is achieved to reduce the cost of packaging and transportation, and it is convenient for consumers to assemble the sofa; the positioning member 25 is a bolt, and the locking member 26 is a butterfly nut, and there is no need to newly design the positioning member 25 and the locking member 26. The armrest member 4 can be installed using existing parts, which reduces costs and is simple and convenient to implement.

[0062] The positioning member 25 is arranged on the mounting portion 41; in order to further facilitate the installation of the armrest member 4, the thickness and volume of the armrest member 4 will be smaller than the existing armrest member 4, such as the thickness of the mounting portion 41 is only 6-9 mm. In the present embodiment, the thickness of the mounting portion 41 is 8 mm. Compared with the armrests in traditional sofas, the thickness and volume of the mounting portion 41 are smaller and lighter, which is convenient for consumers to install, and also saves the cost of materials and packaging and transportation; and because the thickness of the mounting portion 41 is small and cannot support the human arm, a supporting portion 42 is also required to be provided. The shape of the supporting portion 42 can be designed in a variety of ways, but the supporting portion 42 needs to extend laterally in the left and right directions to widen the maximum width of the supporting portion 42, so as to be suitable for supporting the user's arm.

[0063] Specifically, there are three positioning members 25 and mounting holes 24, and the three positioning members 25 are arranged in a triangle, and two of the positioning members 25 are located at the lower part of the armrest member 4, and one positioning member 25 is located in the middle part of the armrest member 4; correspondingly, one of the aforementioned mounting holes 24 is opened in the middle part of the first longitudinal rod, and one of the aforementioned mounting holes 24 is opened at the front end and the rear end of the second longitudinal rod; the number of positioning members 25 and mounting holes 24 is three, which is not too many and will not make the installation complicated. At the same time, the three positioning members 25 are arranged in a triangle, which can increase the connection strength and stability of the installation of the armrest member 4; the specific opening positions of the mounting holes 24 are that one of the mounting holes 24 is on the first longitudinal rod located at the upper part of the armrest frame 502 and two of the mounting holes 24 are on the second longitudinal rod located at the lower part of the armrest frame 502, thereby forming a triangular arrangement, which increases the connection strength and stability of the installation of the armrest member 4; in addition, the structure of the motion unit is simple enough to leave a large enough space for consumers to put their hands into the mechanical extension unit to install the locking member 26.

[0064] The mounting portion 41 includes a plate and leather covering the plate; the supporting portion 42 also has the same structure, the plate may be a wooden board, and the leather is used to increase the comfort of the armrest 4 and enhance the appearance of the armrest 4, thereby reducing the cost of the armrest 4.

[0065] The sofa also includes support legs 27, which are detachably arranged at the bottom of the mechanical extension device in the use state; the support legs 27 are configured so that when in the packaging state, the support members are removed from the mechanical extension device; after the support legs 27 are installed on the mechanical extension device, the height of the mechanical extension device from the ground can be adjusted, and thus the seat height of the sofa can be adjusted; in the packaging state, the support legs 27 are also removed from the mechanical extension device, so as to make the packaging as neat as possible, so as to improve space utilization and reduce packaging and transportation costs.

Claims

1. A detachable sofa, characterized in that: It includes a mechanical extension device and two armrest members symmetrically arranged on both sides of the mechanical extension device. The mechanical extension device includes a frame as a main body support, the frame includes two armrest frames symmetrically arranged on the left and right, and the armrest frames are provided with mounting holes that pass through the armrest frames on the left and right; a positioning member is provided on the armrest member, the positioning member is inserted in the mounting hole and exposed to the armrest frame toward the inside of the mechanical extension device, and a locking member is provided on the positioning member exposed to the armrest frame, and the locking member is configured to lock the positioning member in the mounting hole and enable the armrest member to be installed on the armrest frame.

2. The detachable sofa according to claim 1, characterized in that: The armrest member includes a vertical mounting portion and a laterally extending supporting portion, the supporting portion is located at the upper end of the mounting portion, the supporting portion is configured to support a human arm, the mounting portion is configured to be connected to the armrest frame, and the positioning member is arranged on the mounting portion.

3. The detachable sofa according to claim 1, characterized in that: There are three positioning pieces and three mounting holes, and the three positioning pieces are arranged in a triangle, and two of the positioning pieces are located at the lower part of the armrest piece, and one positioning piece is located at the middle part of the armrest piece.

4. The detachable sofa according to claim 1, characterized in that: The armrest frame includes a first longitudinal rod, a second longitudinal rod, a first vertical rod and a second vertical rod. The first longitudinal rod is located above the second longitudinal rod, the first vertical rod is located in front of the second vertical rod, the front and rear ends of the first longitudinal rod are fixedly connected to the upper ends of the first vertical rod and the second vertical rod, and the front and rear ends of the second longitudinal rod are fixedly connected to the lower ends of the first vertical rod and the second vertical rod; a mounting hole is provided in the middle of the first longitudinal rod, and a mounting hole is provided at the front end and the rear end of the second longitudinal rod.

5. The detachable sofa according to claim 1, characterized in that: The mechanical extension device also includes a motion unit, which is arranged in the frame and connected to the upper end of the frame; the motion unit includes a back connection member, a footrest connection member, a footrest motion assembly and a connecting rod, the back connection member is configured to connect to the backrest, and the footrest connection member is configured to connect to the footrest member; The back connecting piece is rotatably arranged at the rear end of the frame; one end of the footrest motion assembly is rotatably connected to the front end of the frame, and the other end of the footrest motion assembly is rotatably connected to the footrest connecting piece; the connecting rod is arranged along the front and rear directions, and the front and rear ends of the connecting rod are rotatably connected to the footrest motion assembly and the back connecting piece respectively.

6. The detachable sofa according to claim 1, characterized in that: The installation part includes a plate and leather covering the plate.

7. The detachable sofa according to claim 6, characterized in that: The thickness of the mounting portion is 6-9 mm.

8. The detachable sofa according to claim 1, characterized in that: The positioning piece is a bolt, and the locking piece is a butterfly nut.

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