Sofa capable of improving space utilization rate during packaging

Abstract

The utility model provides a sofa capable of improving the space utilization rate during packaging, which comprises a mechanical stretching device and a backrest detachably connected to the mechanical stretching device, and the mechanical stretching device is provided with an accommodating space opened downwards and / or backwards; the sofa has a packaging state and a using state; in a packaging state, the backrest is arranged in the accommodating space of the mechanical stretching device; in the using state, the backrest is installed at the rear end of the mechanical stretching device. The containing space enough for containing the backrest is reserved in the mechanical stretching device, so that the backrest can enter the containing space in the packaging state, the packaging size is equivalent to the size only occupied by the mechanical stretching device during packaging, and the backrest can be arranged and placed more compactly during transportation; the backrest does not need to be additionally packaged, so that the packaging and transporting cost is reduced; after a consumer receives the sofa, the sofa can be in a use state only by installing the backrest on the rear end part of the mechanical stretching device, and the assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a sofa that improves the space utilization rate during packaging. Background Art

[0002] In the existing electric sofas, a mechanical stretching device is used to realize the state switching of the sofa. Generally, it can realize the sitting posture state for users to sit and the lying posture state for users to lie down. Therefore, the mechanical stretching device is the core framework of such electric sofas and an indispensable assembly; then, components such as armrests, backrests, seats, and footrests are installed on the mechanical stretching device to form a complete electric sofa.

[0003] For manufacturers, in order to improve efficiency, it is necessary to reasonably reduce a part of the costs, including the packaging and transportation costs of the sofa; if the manufacturer ships the sofa to consumers after complete assembly, it will undoubtedly face higher packaging and transportation costs. Especially because the backrest significantly protrudes upward from components such as the mechanical stretching device, it not only increases the packaging cost but also is not conducive to the placement during transportation, resulting in low space utilization rate.

[0004] If the backrest can be removed for transportation, it can not only reduce the packaging cost but also improve the space utilization rate, and fewer trips are required to transport the same number of sofas; however, the method of removing the backrest and packaging it separately for transportation still requires paying the packaging and transportation costs of the backrest. Therefore, how to further reduce the packaging and transportation costs of the sofa is an urgent problem to be solved. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model provides a sofa that improves the space utilization rate during packaging. By leaving a sufficient accommodation space for placing the backrest in the mechanical stretching device, the backrest can enter the accommodation space in the packaging state. When packaging, the packaging volume is equivalent to only the volume occupied by the mechanical stretching device. During transportation, it can also be arranged and placed more compactly, and there is no need to additionally package the backrest, thereby reducing the costs during packaging and transportation; when the consumer receives it, the sofa can be put into use by simply installing the backrest on the rear end of the mechanical stretching device, and the assembly is also relatively convenient; in the packaging state, the backrest can be placed into the accommodation space from bottom to top or from back to front, and it is also relatively convenient to put the backrest into the accommodation space, which further facilitates packaging and transportation.

[0006] The technical solution of the utility model is realized as follows:

[0007] A sofa that improves the space utilization rate during packaging, comprising a mechanical stretching device and a backrest detachably connected to the mechanical stretching device. The mechanical stretching device has a receiving space that opens downward and / or backward; the sofa has a packaging state and a use state; in the packaging state, the backrest is placed in the receiving space of the mechanical stretching device; in the use state, the backrest is installed at the rear end of the mechanical stretching device.

[0008] By leaving a sufficient receiving space in the mechanical stretching device for placing the backrest, the backrest can enter the receiving space in the packaging state. When packaging, the packaging volume is equivalent to only the volume occupied by the mechanical stretching device. During transportation, it can also be arranged more compactly, and there is no need to additionally package the backrest, thereby reducing the cost of packaging and transportation; when the consumer receives it, simply installing the backrest at the rear end of the mechanical stretching device can make the sofa in the use state, and the assembly is simple and convenient; in the packaging state, the backrest can be placed into the receiving space from bottom to top or from back to front, and it is also convenient to place the backrest into the receiving space, which further facilitates packaging and transportation.

[0009] Preferably, the mechanical stretching device includes a frame and a motion unit. The motion unit is arranged on the frame and connected to the upper end of the frame; the motion unit includes a backrest connecting member, a footrest connecting member, a footrest motion assembly, and a connecting rod. The backrest connecting member is configured to connect the backrest, and the footrest connecting member is configured to connect the footrest; the backrest connecting member 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 member; the connecting rod is arranged in the front-rear direction, and the front and rear ends of the connecting rod are respectively rotatably connected to the footrest motion assembly and the backrest connecting member. The motion unit is suspended on the frame, and the frame leaves the receiving space below the motion unit; moreover, the structure of the motion unit is simple enough to vacate a sufficiently large receiving space.

[0010] Preferably, the sofa has a sitting posture and a lying posture. In the sitting posture, the footrest motion assembly is retracted into the frame; in the lying posture, the footrest motion assembly extends out of the frame; a general space is formed inside the frame, and the general space includes an occupied space and the receiving space. In the packaging state, the sofa is in the sitting posture, the motion unit is in the occupied space, and the backrest is in the receiving space. In the general space of the frame, in addition to the occupied space occupied by the motion unit, there is also the receiving space for placing the backrest in the packaging state. Therefore, the general space is the internal space in the traditional mechanical stretching device, and the receiving space is not the internal space in the traditional mechanical stretching device. The existence of the receiving space enables the backrest to be placed therein, which is a feature not possessed by the traditional mechanical stretching device.

[0011] Preferably, the back connector includes an insertion piece, and the backrest is provided with a socket connector. A slot is formed in the socket connector. In the use state, the insertion piece is inserted into and cooperates with the socket connector. The backrest and the back connector are connected through the insertion and cooperation of the insertion piece and the socket connector. The installation method is convenient and simple, which is convenient for the user to change the sofa from the packaged state to the use state after receiving it.

[0012] Preferably, the socket connector is provided with an elastic flap, and a locking hole is formed in the insertion piece. In the use state, the insertion piece is inserted into the socket connector, and the elastic flap is snapped into the locking hole. After the socket connector and the insertion piece are inserted, the locking is completed by the clamping of the elastic flap and the locking hole, so as to make the connection between the backrest and the back connector more stable.

[0013] Preferably, a retaining seat is provided at the upper end of the socket connector, and the elastic flap extends from the lower end of the retaining seat. The retaining seat can prevent the insertion piece from exceeding the upper part of the socket connector, ensuring the success rate of the connection between the socket connector and the insertion piece.

[0014] Preferably, the frame includes a first connecting rod, a second connecting rod and two armrest frames symmetrically arranged on the left and right. The accommodating space is located between the two armrest frames; the first connecting rod is located in front of the second connecting rod, and the left and right ends of the first connecting rod are respectively fixedly connected to the front ends of the two armrest frames, and the left and right ends of the second connecting rod are respectively fixedly connected to the rear ends of the two armrest frames; and in the up and down direction, the second connecting rod is located in the middle of the armrest frame. The second connecting rod is not arranged at the lower end of the armrest frame, but in the middle of it. In this way, after the accommodating space is formed between the two armrest frames, the position of the second connecting rod can avoid the backrest placed in the accommodating space.

[0015] Preferably, the second connecting rod is 100 - 120 mm higher than the lower surface of the armrest frame. The second connecting rod has a certain height relative to the bottom of the armrest frame, so that the lower rear part of the frame can be opened. Due to this opening, in the packaged state, the backrest can be placed into the accommodating space more conveniently and easily without being blocked by the second connecting rod, thereby improving the space utilization rate during packaging and transportation and reducing the packaging and transportation costs.

[0016] Preferably, the lowest height of the connecting rod is higher than that of the second connecting rod, and the lowest height of the back connector is higher than that of the second connecting rod. The positions of the connecting rod and the back connector make the back connector not affect the placement of the backrest into the accommodating space.

[0017] Preferably, the backrest includes a back frame and a soft pad covering the outside of the back frame. The soft pad has elasticity, and the size of the back frame is smaller than the size of the accommodating space. The soft pad has elasticity, and even if the volume of the soft pad is larger than the volume of the accommodating space, the soft pad can still be squeezed and stuffed into the accommodating space.

[0018] Preferably, it further includes two armrest members arranged symmetrically left and right, and the two armrest members are detachably connected to the mechanical extension device; in the use state, the two armrest members are installed on the mechanical extension device; in the packaging state, the two armrest members are stacked on the mechanical extension device. The armrest members are used to support the human arm, and the armrest members can also be detached from the mechanical extension device in the packaging state and stacked on the mechanical extension device, so as to reduce the space occupied during packaging in the left and right directions.

[0019] Preferably, the armrest member includes a vertical installation portion and a supporting portion extending outwards, and the supporting portion is configured to support the human arm; in the packaging state, the installation portion is located above the mechanical extension device, and the supporting portion is located on the side of the mechanical extension device. In order to support the human arm, the width of the supporting portion is slightly wider. If the armrest member is not removed in the packaging state, the supporting portion will occupy more space in the left and right directions. However, when the armrest member is stacked on the mechanical extension device, with the installation portion located above the mechanical extension device and the supporting portion located on the side of the mechanical extension device, the packaging volume can be further reduced, and the packaging and transportation costs can be lowered.

[0020] Preferably, a positioning member is provided on the installation portion, and an installation hole is formed on the mechanical extension device. In the use state, the positioning member is inserted into the installation hole and protrudes towards the inside of the mechanical extension device; a locking member is also provided on the positioning member, and the locking member is configured to tighten the locking member on the positioning member to lock the installation portion on the mechanical extension device. This solution is used for the quick disassembly and assembly of the armrest member, simplifies the disassembly and assembly operation, reduces the difficulty of disassembly and assembly, and consumers can also quickly install it by themselves without screwing inside the mechanical extension device; the simple internal structure of the mechanical extension device also makes the installation of the armrest member more convenient.

[0021] Preferably, it further includes a support foot. In the use state, the support foot is detachably arranged at the bottom of the mechanical extension device; the support foot is configured to be removed from the mechanical extension device in the packaging state. After the support foot is installed on the mechanical extension device, the ground clearance of the mechanical extension device can be adjusted, and thus the seat height of the sofa can be adjusted; in the packaging state, the support foot is also removed from the mechanical extension device to make the packaging as regular as possible, so as to improve the space utilization rate and reduce the packaging and transportation costs.

[0022] Preferably, it further includes a seat portion, and the seat portion is installed on the mechanical extension device in both the use state and the packaging state. When the consumer receives this sofa, there is no need to install the seat portion, which simplifies the installation steps.

[0023] The design starting point, concept and beneficial effects of the present utility model adopting the above technical solutions are:

[0024] By leaving sufficient accommodation space for the backrest in the mechanical extension device, the backrest can enter this accommodation space in the packaged state. When packaging, the packaging volume is equivalent to only the volume occupied by the mechanical extension device. During transportation, it can also be arranged more compactly, and there is no need to package the backrest separately, thereby reducing the cost during packaging and transportation. When the consumer receives it, the sofa can be put into use by simply installing the backrest at the rear end of the mechanical extension device; the assembly is simple and convenient. In the packaged state, the backrest can be placed into the accommodation space from bottom to top or from back to front, and it is also convenient to put the backrest into the accommodation space, which further facilitates packaging and transportation. Description of the Drawings

[0025] Figure 1 Schematic perspective view of the sofa in the sitting posture in the use state of the present invention in the embodiment;

[0026] Figure 2 Front view of the sofa in the sitting posture in the use state of the present invention in the embodiment;

[0027] Figure 3 Schematic perspective view of the sofa in the packaged state of the present invention in the embodiment;

[0028] Figure 4 Schematic perspective view of the sofa with the backrest cushion removed in the packaged state of the present invention in the embodiment;

[0029] Figure 5 Schematic perspective view of the backrest frame installed on the mechanical extension device in the embodiment of the present invention;

[0030] Figure 6 Schematic perspective view of the mechanical extension device in the embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the internal space division of the mechanical extension device in the embodiment of the present invention;

[0032] Figure 8 Schematic perspective view of the frame in the embodiment of the present invention;

[0033] Figure 9 Schematic perspective view of the backrest frame in the embodiment of the present invention;

[0034] Figure 10 Schematic perspective view of the mechanical extension device and the backrest frame in the sofa in the lying posture in the use state of the present invention in the embodiment;

[0035] Figure 11 Schematic diagram of the armrest member installed on the armrest frame in the embodiment of the present invention.

[0036] Each reference numeral is as follows: footrest member 1; seat portion 2; backrest 3; back frame 31; cushion 32; armrest member 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 rod 511; second connecting rod 512; footrest connecting member 6; back connecting member 7; insert piece 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; plug-in member 19; slot 20; retaining seat 21; elastic flap 22; locking hole 23; mounting hole 24; positioning member 25; locking member 26; support foot 27; actuator 28. Detailed implementation manners

[0037] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0038] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, the terms "first", "second", "third", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] The specific implementation manners of the present invention are as follows:

[0041] As Figures 1-4As shown in the figure, the present utility model provides a sofa that improves the space utilization rate during packaging. The sofa includes a mechanical stretching device, a footrest member 1, a seat portion 2, a backrest 3, and two armrest members 4 symmetrically arranged on both sides of the mechanical stretching device. The footrest member 1 is arranged on the front side of the mechanical stretching device, the seat portion 2 is arranged on the upper part of the mechanical stretching device, and the backrest 3 is arranged at the rear end of the mechanical stretching device. The sofa has a packaging state and a use state, and in the use state, it has a sitting posture and a lying posture, and is used for packaging and transportation in the packaging state. The footrest member 1 is configured to support the legs and feet of the human body when the sofa is in the lying posture, the seat portion 2 is configured to support the buttocks of the human body, the backrest 3 is configured to support the back of the human body, and the armrest member 4 is configured to support the arms of the human body.

[0042] As Figures 5-8 shown, the mechanical stretching device includes:

[0043] A frame 5 configured as the main support of the mechanical stretching device; the frame 5 includes a seat frame 501 for installing the seat portion 2, and the seat frame 501 is at the upper end of the frame 5.

[0044] Two motion units symmetrically arranged on the left and right on the frame 5, and the two motion units are suspended on the seat frame 501; the motion unit includes a footrest motion component, a footrest connecting member 6, a back connecting member 7, and a connecting rod 8. The footrest connecting member 6 is configured to connect the footrest member 1, the back connecting member 7 is configured to connect the backrest 3, the footrest motion component is configured to drive the footrest connecting member 6 to move, and the connecting rod 8 is configured to link the footrest motion component and the back connecting member 7; one end of the footrest motion component is rotatably connected to the seat frame 501, and the other end of the footrest motion component is rotatably connected to the footrest connecting member 6; the back connecting member 7 is rotatably connected to the seat frame 501, and the front and rear ends of the connecting rod 8 are respectively rotatably connected to the footrest motion component and the back connecting member 7.

[0045] 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;

[0046] An actuator 28, the front and rear ends of which are respectively installed on the frame 5 and the linkage member 9, and the actuator 28 is configured to drive the motion unit to move.

[0047] The frame 5 serves as the supporting main body to replace the base plate or pedestal at the lower part of the traditional mechanical stretching device. At the same time, the frame 5 also integrates the seat frame 501, reducing the connecting rod 8 and components related to the seat frame 501 and its movement in the traditional mechanical stretching device; in the motion unit, except for the necessary footrest connecting member 6 and back connecting member 7, there are only the footrest motion component and the connecting rod 8. On the premise of ensuring that the mechanical stretching device can move so that the sofa can be used by the user for sitting and lying, the number of rods in the motion unit is greatly reduced, and the mechanical stretching device is maximally streamlined, thereby reducing the material and assembly costs of production.

[0048] Moreover, the frame 5 serves as the supporting main body, enabling the moving unit not to necessarily be connected downward to the lower part of the mechanical stretching device, leaving space below the moving unit. That is, the frame 5 provides the main support, and the seat frame 501, as a part of the frame 5, remains stationary with the ground. The moving unit is suspended on the frame 5 without being connected to the lower end of the frame 5. 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.

[0049] 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. The effects and utilization efficiency of the frame 5 are higher than those of the base in the traditional mechanical stretching device.

[0050] 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. 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. 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. 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. 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. Different from the flat base in the traditional mechanical stretching device, the cuboid frame 5 structure of the 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.

[0051] The frame 5 further 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 respectively fixedly connected to the lower ends of the first left vertical rod 55 and the first right vertical rod 58. The left and right ends of the second connecting rod 512 are respectively fixedly connected to the second left vertical rod 56 and the second right vertical rod 59. 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 to strengthen the strength of the frame 5. The actuator 28 is an electric push rod.

[0052] 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 movement 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 to the seat portion 2. The first mounting member 10 and the second mounting member 11 can avoid the connection points of the back connecting member 7 and the footrest movement assembly from the connection position of the seat portion 2, so as not to affect the installation of the seat portion 2 onto the seat frame 501. The first mounting member 10 and the second mounting member 11 are plate members.

[0053] Specifically, the footrest movement assembly includes a first footrest connecting rod 12, a second footrest connecting rod 13, a third footrest connecting rod 14, and a fourth footrest connecting rod 15. The first footrest connecting rod 12 is located behind the second footrest connecting rod 13. The upper ends of the first footrest connecting rod 12 and the second footrest connecting rod 13 are both rotatably connected to the first mounting member 10. The rear end of the third footrest connecting rod 14 is rotatably connected to the lower end of the first footrest connecting rod 12, the rear end of the fourth footrest connecting rod 15 is rotatably connected to the lower end of the second footrest connecting rod 13, and the middle of the third footrest connecting rod 14 is rotatably connected to the middle of the second footrest connecting rod 13. The front end of the third footrest connecting rod 14 is rotatably connected to the rear end of the footrest connecting member 6, and the front end of the fourth footrest connecting rod 15 is rotatably connected to the front of the footrest connecting member 6. The footrest movement assembly includes four connecting rods 8, forming a scissor-like form to realize the retraction and extension of the footrest connecting member 6, and the structure is simpler than that of traditional mechanical extension devices.

[0054] The connecting rod 8 is arranged in the front-rear 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 movement assembly drives the footrest connecting member 6 to extend forward, the connecting rod 8 moves forward to drive the rear end of the back connecting member 7 forward, causing the back connecting member 7 to rotate backward, thereby realizing the lying posture of the sofa footrest extending forward and the backrest 3 reclining backward. 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 lengths of the connecting rod 8 and the actuator 28, it is more appropriate to arrange the connecting rod 8 and the linkage member 9 on the first footrest connecting rod 12, which can minimize the lengths of the connecting rod 8 and the actuator 28, thereby reducing costs.

[0055] Regarding the installation of the seat part 2: As Figures 6-8 shown, an installation auxiliary member 16 is provided below the seat frame 501, and the installation auxiliary member 16 is provided below each of 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 member 16 includes connecting portions 161 at the front and rear ends and an installation rod 162 located between the connecting portions 161. There is a gap between the installation rod 162 and the seat frame 501. The installation auxiliary member 16 is configured to fix the seat part 2 on the seat frame 501; during installation, after winding the edge of the seat part 2 around the installation rod 162, the edge of the seat part 2 is clamped with a C-shaped staple on the installation rod 162 to complete the installation of the seat part 2; moreover, in both the use state and the packaging state, the seat part 2 is installed on the mechanical extension device; when the consumer receives this sofa, there is no need to install the seat part 2, which simplifies the installation steps.

[0056] Regarding the packaging and installation of the backrest 3: Further, as Figures 1-10As shown, the mechanical stretching device has a receiving space 17 that opens downward and / or backward. In the packaged state, the backrest 3 is placed in the receiving space 17 of the mechanical stretching device. By leaving enough space 17 in the mechanical stretching device to place the backrest 3, the backrest 3 can enter this space 17 in the packaged state. When packaging, the packaging volume is equivalent to only the volume occupied by the mechanical stretching device. During transportation, it can also be arranged more compactly, and there is no need to additionally package the backrest 3, thus reducing the cost of packaging and transportation. When the consumer receives it, the sofa can be put into use by simply installing the backrest 3 at the rear end of the mechanical stretching device, and the assembly is simple and convenient. In the packaged state, the backrest 3 can be placed into the receiving space 17 from bottom to top or from back to front, and it is also convenient to put the backrest 3 into the receiving space 17, which further facilitates packaging and transportation. In this embodiment, although due to the position of the second connecting rod 512, the receiving space 17 opens downward and backward on the mechanical stretching device, however, the rear of the mechanical stretching device is blocked by the cloth cover. Therefore, when packaging, the backrest 3 can be stuffed into the receiving space 17 from bottom to top. Specifically:

[0057] In the sitting posture, the footrest movement assembly is retracted in the frame 5. In the lying posture, the footrest movement assembly extends out of the frame 5. An overall space is formed inside the frame 5, and the overall space includes an occupied space 18 and the receiving space 17. In the packaged state, the sofa is in the sitting posture, the movement unit is inside the occupied space 18, and the backrest 3 is inside the receiving space 17. In the overall space of the frame 5, in addition to the occupied space 18 occupied by the movement unit, there is also the receiving space 17 for placing the backrest 3 in the packaged state. Therefore, the overall space is the internal space in a traditional mechanical stretching device, while the receiving space 17 is not the internal space in a traditional mechanical stretching device. The existence of the receiving space 17 enables the backrest 3 to be placed therein, which is a feature not possessed by traditional mechanical stretching devices. Moreover, the movement unit is suspended on the frame 5, and the whole movement unit is located at a position slightly above the overall space. The frame 5 leaves the receiving space 17 below the movement unit. And the structure of the movement unit is simple enough to vacate a sufficiently large receiving space 17.

[0058] The receiving space 17 is located between two armrest frames 502. The first connecting rod and the second connecting rod 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 ends of the second left vertical rod 56 and the second right vertical rod 59, but is located in the middle of the two. Thus, after the receiving 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 receiving space 17.

[0059] The second connecting rod 512 is 100 - 120 mm higher than the lower surface of the armrest frame 502. In this 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 part of the frame 5 can be opened. Due to this opening and the avoidance of the second connecting rod 512, when in the packaged state, the backrest 3 can be more conveniently and easily placed into the accommodating space 17 without being blocked by the second connecting rod 512, thereby improving the space utilization rate during packaging and transportation and reducing the packaging and transportation costs.

[0060] Furthermore, the height of the lowermost end of the connecting rod 8 is higher than that of the second connecting rod 512, and the height of the lowermost end of the backrest connecting member 7 is higher than that of the second connecting rod 512. The positions of the connecting rod 8 and the backrest connecting member 7 are such that the backrest connecting member 7 does not affect the backrest 3 being placed into the accommodating space 17.

[0061] The backrest connecting member 7 includes an insertion piece 71, and the backrest 3 is provided with a plug-in member 19. A slot 20 is formed in the plug-in member 19. In the use state, the insertion piece 71 is in plug-in fit with the plug-in member 19. Specifically, a retaining seat 21 is provided at the upper end of the plug-in member 19, and an elastic flap 22 extends from the lower end of the retaining seat 21. A locking hole 23 is formed in the insertion piece 71. In the use state, when the insertion piece 71 is plugged into the plug-in member 19, the elastic flap 22 is snapped into the locking hole 23. The connection between the backrest 3 and the backrest connecting member 7 is realized through the plug-in fit of the insertion piece 71 and the plug-in member 19. The installation method is convenient and simple, facilitating the user to change the sofa from the packaged state to the use state after receiving it. The retaining seat 21 can prevent the insertion piece 71 from protruding above the plug-in member 19, ensuring the success rate of the connection between the plug-in member 19 and the insertion piece 71. After the plug-in member 19 and the insertion piece 71 are plugged in, the locking is completed by the snap connection of the elastic flap 22 and the locking hole 23, making the connection between the backrest 3 and the backrest connecting member 7 more stable.

[0062] In addition, the backrest 3 includes a backrest frame 31 and a cushion 32 wrapped outside the backrest frame 31. The cushion 32 has elasticity, and the size of the backrest frame 31 is smaller than the size of the accommodating space 17. Since the cushion 32 has elasticity, even if the volume of the cushion 32 is larger than the volume of the accommodating space 17, the cushion 32 can still be squeezed and stuffed into the accommodating space 17.

[0063] Regarding the packaging and installation of the armrest:

[0064] As Figures 1-8, as shown in Fig. 11, two armrest members 4 are detachably connected to the mechanical extension device. In the use state, the two armrest members 4 are installed on the mechanical extension device; in the packaging state, the two armrest members 4 are stacked on the mechanical extension device; the armrest members 4 are used to support the human arm, and the armrest members 4 can also be detached from the mechanical extension device in the packaging state and stacked on the mechanical extension device, so as to reduce the space occupied during packaging in the left-right direction. Specifically:

[0065] The armrest member 4 includes a vertical mounting portion 41 and a supporting portion 42 extending horizontally outward from the sofa. The supporting portion 42 is located at the upper end of the mounting portion 41. The supporting portion 42 is configured to support the human arm, and the mounting portion 41 is configured to be connected to the armrest frame 502; in the packaging state, the mounting portion 41 is located above the mechanical extension device, and the supporting portion 42 is located on 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 packaging state, the supporting portion 42 will occupy more space in the left-right direction. After the armrest member 4 is stacked on the mechanical extension device, when the mounting portion 41 is located above the mechanical extension device and the supporting portion 42 is located on the side of the mechanical extension device, the packaging volume can be further reduced and the packaging and transportation costs can be reduced.

[0066] Furthermore, the armrest frame 502 is provided with a mounting hole 24 penetrating through the armrest frame 502 from left to right; the armrest member 4 is provided with a positioning member 25. The positioning member 25 is inserted into the mounting hole 24 and protrudes from the armrest frame 502 toward the inside of the mechanical extension device. A locking member 26 is provided on the positioning member 25 protruding from the armrest frame 502. The locking member 26 is configured to lock the positioning member 25 in the mounting hole 24 and mount the armrest member 4 on the armrest frame 502; that is, in the use state, the positioning member 25 is inserted into the mounting hole 24 and protrudes toward the inside of the mechanical extension device, and the locking member 26 is tightened on the positioning member 25 to lock the mounting portion 41 on the mechanical extension device; this solution is used for the quick 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.

[0067] The overall structure is simplified by integrating the armrest frame 502 into the frame 5, laying the foundation for simple and fast assembly; when the armrest member 4 is installed on the armrest frame 502, it is only necessary to position and 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 complicated operations such as screwing. Even consumers can easily complete it; therefore, both the disassembly and assembly of the armrest member 4 are realized to reduce the packaging and transportation costs, and it is also convenient for consumers to assemble the sofa; the positioning member 25 is a bolt, and the locking member 26 is a wing nut. There is no need to newly design the positioning member 25 and the locking member 26. The installation of the armrest member 4 can be realized by using existing parts, which reduces the cost and is simple and convenient to implement.

[0068] The positioning member 25 is arranged on the mounting portion 41. To further facilitate the installation of the armrest member 4, the thickness and volume of the armrest member 4 are smaller than those of the existing armrest members 4. For example, the thickness of the mounting portion 41 is only 6-9 mm. In this 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, making it lighter and more convenient for consumers to install. At the same time, it also saves the cost of materials and packaging transportation. Since the thickness of the mounting portion 41 is small and cannot support the human arm, a supporting portion 42 needs to be provided. The shape of the supporting portion 42 can be designed in various ways, but the supporting portion 42 needs to extend horizontally in the left-right direction to widen the maximum width of the supporting portion 42, so as to be suitable for supporting the user's arm.

[0069] Specifically, both the positioning member 25 and the mounting holes 24 are three in number. 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 of the armrest member 4. Correspondingly, one of the mounting holes 24 is opened in the middle of the first longitudinal rod, and one mounting hole 24 is opened at each of the front end and the rear end of the second longitudinal rod. The number of the positioning member 25 and the 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 position of the mounting hole 24 is that one mounting hole 24 is on the first longitudinal rod above the armrest frame 502, and two mounting holes 24 are on the second longitudinal rod below the armrest frame 502, thus forming a triangle arrangement to increase 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 vacate enough space for consumers to reach into the mechanical extension unit to install the locking member 26.

[0070] The mounting portion 41 includes a plate member and leather wrapped around the plate member. The supporting portion 42 has the same structure. The plate member can be a wooden board, and the leather is used to increase the comfort of the armrest member 4 and improve the appearance of the armrest member 4, thereby reducing the cost of the armrest member 4.

[0071] The sofa further includes supporting feet 27. In the use state, the supporting feet 27 are detachably arranged at the bottom of the mechanical extension device. The supporting feet 27 are configured to be removed from the mechanical extension device in the packaging state. After the supporting feet 27 are installed on the mechanical extension device, the ground clearance of the mechanical extension device can be adjusted, that is, the seat height of the sofa can be adjusted. In the packaging state, the supporting feet 27 are also removed from the mechanical extension device to make the packaging as regular as possible, so as to improve the space utilization rate and reduce the packaging and transportation costs.

Claims

1. A sofa that improves space utilization during packaging, characterized in that: The invention comprises a mechanical extension device and a backrest detachably connected to the mechanical extension device, wherein the mechanical extension device has a storage space open downward and / or backward; the sofa has a packaging state and a use state; in the packaging state, the backrest is placed in the storage space of the mechanical extension device; in the use state, the backrest is installed at the rear end of the mechanical extension device; the mechanical extension device comprises a frame and a motion unit, wherein the motion unit is arranged on 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 the backrest, and the footrest connector is configured to connect the footrest; 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.

2. The sofa for improving space utilization during packaging according to claim 1, characterized in that: The sofa has a sitting posture and a lying posture. In the sitting posture, the footrest movement component is folded in the frame; In the lying position, the footrest movement assembly extends outward from the frame; An overall space is formed in the frame, and the overall space includes an occupied space and the accommodating space. In a packaged state, the sofa is in a sitting posture, the motion unit is in the occupied space, and the backrest is in the accommodating space.

3. The sofa for improving space utilization during packaging according to claim 1, characterized in that: The back connector includes a plug-in piece, a plug-in piece is provided on the backrest, a slot is provided on the plug-in piece, and in use, the plug-in piece and the plug-in piece are plugged together; an elastic paddle is provided on the plug-in piece, a locking hole is provided on the plug-in piece, and in use, the plug-in piece and the plug-in piece are plugged together, and the elastic paddle is stuck in the locking hole; a stopper is provided on the upper end of the plug-in piece, and the elastic paddle extends from the lower end of the stopper.

4. The sofa for improving space utilization during packaging according to claim 1, characterized in that: The frame includes a first connecting rod, a second connecting rod and two armrest frames symmetrically arranged on the left and right, and the accommodating space is located between the two armrest frames; the first connecting rod is located on the front side of the second connecting rod, the left and right ends of the first connecting rod are respectively fixedly connected to the front ends of the two armrest frames, and the left and right ends of the second connecting rod are respectively fixedly connected to the rear ends of the two armrest frames; and in the up and down direction, the second connecting rod is located in the middle of the armrest frame; the second connecting rod is 100-120mm higher than the lower surface of the armrest frame; the height of the lowest end of the connecting rod is higher than the second connecting rod, and the height of the lowest end of the back connecting piece is higher than the second connecting rod.

5. The sofa for improving space utilization during packaging according to claim 1, characterized in that: The backrest comprises a back frame and a soft cushion wrapped around the back frame, the soft cushion is elastic, and the size of the back frame is smaller than the size of the accommodating space.

6. The sofa for improving space utilization during packaging according to claim 1, characterized in that: It also includes two armrests that are symmetrically arranged on the left and right, and the two armrests are detachably connected to the mechanical stretching device; in the use state, the two armrests are installed on the mechanical stretching device; in the packaging state, the two armrests are stacked on the mechanical stretching device.

7. The sofa for improving space utilization during packaging according to claim 6, characterized in that: The armrest member includes a vertical mounting portion and an outwardly extending supporting portion, the supporting portion being configured to support a human arm; in a packaged state, the mounting portion is located above the mechanical extension device, and the supporting portion is located on the side of the mechanical extension device; a positioning piece is provided on the mounting portion, and a mounting hole is provided on the mechanical extension device, and in a use state, the positioning piece is inserted into the mounting hole and protrudes toward the inside of the mechanical extension device; a locking piece is also provided on the positioning piece, and the locking piece is configured to be tightened on the positioning piece so that the mounting portion is locked on the mechanical extension device.

8. The sofa for improving space utilization during packaging according to claim 1, characterized in that: It also includes support feet, which are detachably arranged at the bottom of the mechanical stretching device when in use; the support feet are configured so that when the support feet are in a packaged state, the support members are removed from the mechanical stretching device.

9. The sofa for improving space utilization during packaging according to claim 1, characterized in that: It also includes a seat, which is mounted on the mechanical extension device in both the use state and the packaging state.

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