Mechanical stretching device

Abstract

The utility model provides a mechanical stretching device. The mechanical stretching device comprises a frame serving as a main body support, two movement units arranged on the frame in a bilateral symmetry mode, a linkage piece arranged between the two movement units and an actuator installed between the frame and the linkage piece. The frame integrates the seat frame, connecting rods and parts related to the seat frame in a traditional mechanical stretching device are saved, the movement unit is only provided with a foot rest movement assembly and a connecting rod except for necessary foot rest connecting pieces and back connecting pieces, and on the premise that it is guaranteed that the mechanical stretching device can move so that a user can sit on and lie down on the sofa, the mechanical stretching device is more convenient to use. The number of rod pieces in the motion unit is greatly reduced, the mechanical stretching device is simplified to the maximum degree, and therefore production materials and assembly cost are reduced.

Description

Technical Field

[0001] The utility model relates to the field of furniture, and particularly to a mechanical stretching device. Background Art

[0002] In 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 an electric sofa and is an indispensable assembly. At the same time, for manufacturers, the production and assembly of the mechanical stretching device affect the cost of the sofa.

[0003] In traditional mechanical stretching devices, there is a base as the main support. The base is generally located at the lower end of the mechanical stretching device and is formed by two plate members arranged front and back and connecting the two plate members through pipe members arranged left and right. Two mechanical stretching units are arranged on the base, and other components in the mechanical stretching unit are accumulated from bottom to top to finally form the mechanical stretching device. Therefore, the number of connecting rods required in traditional mechanical stretching devices is relatively large, and its structure is more complex, and the production materials and assembly costs are relatively high, so the efficiency is low. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides a mechanical stretching device, which includes a frame as the main support, two moving units symmetrically arranged on the left and right of the frame, a linkage arranged between the two moving units, and an actuator installed between the frame and the linkage; the frame integrates the seat frame together, saving the connecting rods and components of the seat frame in the traditional mechanical stretching device. In addition to the necessary footrest connecting parts and back connecting parts in the moving unit, there are only the footrest moving components and the connecting rods. On the premise of ensuring that the mechanical stretching device can move to enable the sofa for users to sit and lie down, the number of rods in the moving unit is greatly reduced, and the mechanical stretching device is maximally streamlined, thereby reducing the production materials and assembly costs.

[0005] The technical solution of the utility model is realized as follows:

[0006] A mechanical stretching device, comprising:

[0007] A frame configured as the main support of the mechanical stretching device; the frame includes a seat frame for installing a seat part, and the seat frame is located at the upper end of the frame;

[0008] Two motion units symmetrically arranged on the left and right on the frame, and the two motion units are suspended on the seat frame; the motion unit includes a footrest motion assembly, a footrest connecting piece, a backrest connecting piece and a connecting rod. The footrest connecting piece is configured to connect the footrest, the backrest connecting piece is configured to connect the backrest, the footrest motion assembly is configured to drive the footrest connecting piece to move, and the connecting rod is configured to link the footrest motion assembly and the backrest connecting piece; one end of the footrest motion assembly is rotatably connected to the seat frame, and the other end of the footrest motion assembly is rotatably connected to the footrest connecting piece; the backrest connecting piece is rotatably connected to the seat frame, and the front and rear ends of the connecting rod are respectively rotatably connected to the footrest motion assembly and the backrest connecting piece;

[0009] A linkage, arranged between the two motion units, and the left and right ends of the linkage are respectively connected to the two motion units;

[0010] An actuator, with its front and rear ends respectively installed on the frame and the linkage, and the actuator is configured to drive the motion unit to move.

[0011] In this solution, the frame serves as the supporting main body to replace the substrate or base at the lower part of the traditional mechanical stretching device. At the same time, the frame also integrates the seat frame therein, reducing the connecting rods and components related to the seat frame and its movement in the traditional mechanical stretching device; in the motion unit, except for the necessary footrest connecting piece and backrest connecting piece, there are only the footrest motion assembly and the connecting rod. 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 streamlined to the greatest extent, thereby reducing the production material and assembly costs.

[0012] Moreover, since the frame serves as the supporting main body, the motion unit does not have to be connected downward to the lower part of the mechanical stretching device, leaving space below the motion unit; that is, the frame is the main support, the seat frame is part of the frame and remains stationary with the ground, the motion unit is suspended on the frame and is not connected to the lower end of the frame. And because the motion unit is suspended on the seat frame, a large space will be left in the frame, and this space can be used to place other components of the sofa and be packaged together to reduce the packaging and transportation costs.

[0013] Preferably, the frame further includes armrest frames located on the left and right sides. The two armrest frames are vertically arranged, the seat frame is horizontally arranged, and the two motion units are located between the two armrest frames; the armrest frames are configured to install armrest components. The frame also integrates the armrest frames therein, and the effects and utilization efficiency of the frame are higher than those of the base in the traditional mechanical stretching device.

[0014] Preferably, the frame is a cuboid frame structure, including a first cross bar, a second cross bar, a first left longitudinal bar, a first right longitudinal bar, a first left vertical bar, a second left vertical bar, a second left longitudinal bar, a first right vertical bar, a second right vertical bar, and a second right longitudinal bar; the seat frame includes a first cross bar, a second cross bar, a first left longitudinal bar, and a first right longitudinal bar; the armrest frame on the left side includes a first left longitudinal bar, a first left vertical bar, a second left vertical bar, and a second left longitudinal bar, and the armrest frame on the right side includes a first right longitudinal bar, a first right vertical bar, a second right vertical bar, and a second right longitudinal bar; the first cross bar is located in front of the second cross bar, and the left and right ends of the first cross bar are fixedly connected to the front ends of the first left longitudinal bar and the first right longitudinal bar, and the left and right ends of the second cross bar are fixedly connected to the rear ends of the first left longitudinal bar and the first right longitudinal bar; the first left vertical bar is located in front of the second left vertical bar, and the front and rear ends of the first left longitudinal bar are respectively fixedly connected to the upper ends of the first left vertical bar and the second left vertical bar, and the front and rear ends of the second left longitudinal bar are respectively fixedly connected to the lower ends of the first left vertical bar and the second left vertical bar. Similarly, the first right vertical bar is located in front of the second right vertical bar, and the front and rear ends of the first right longitudinal bar are respectively fixedly connected to the upper ends of the first right vertical bar and the second right vertical bar, and the front and rear ends of the second right longitudinal bar are respectively fixedly connected to the lower ends of the first right vertical bar and the second right vertical bar; the frame is a cuboid frame structure, different from the flat base in the traditional mechanical stretching device, and the three-dimensional frame can form a seat frame and an armrest frame, so as to facilitate the installation of the seat part and the armrest part.

[0015] Preferably, the frame further includes a first connecting rod and a second connecting rod, and the first connecting rod is located in front of the second connecting rod; the left and right ends of the first connecting rod are respectively fixedly connected to the first left vertical bar and the second left vertical bar; the left and right ends of the second connecting rod are respectively fixedly connected to the second left vertical bar and the second right vertical bar; the rear end of the actuator is rotatably connected to the second connecting rod, and the front end of the actuator is rotatably connected to the linkage. The two connecting rods can further connect the left and right armrest frames, thereby strengthening the strength of the frame.

[0016] Preferably, in the height direction, the second connecting rod is arranged in the middle of the second left vertical bar and the second right vertical bar. The second connecting rod is not arranged at the lower ends of the second left vertical bar and the second right vertical bar, but in the middle of the two, which also forms a space in the middle and lower part of the frame, and this space can be used to place the removed backrest.

[0017] 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 there is an open space at the rear lower part of the frame, and this space can be used to place the removed backrest, thereby improving the space utilization rate during packaging and transportation and reducing the packaging and transportation costs.

[0018] Preferably, a first mounting member is provided at the front end of the seat frame, and a second mounting member is provided at the rear end of the seat frame; the footrest movement assembly is rotatably connected to the first mounting member, and the backrest connecting member is rotatably connected to the second mounting member. The seat frame is used to connect the seat portion, and the first mounting member and the second mounting member can avoid the connection positions of the connection points of the backrest connecting member and the footrest movement assembly with the seat portion, so as not to affect the installation of the seat portion onto the seat frame.

[0019] Preferably, the footrest movement assembly includes a first footrest link, a second footrest link, a third footrest link, and a fourth footrest link. The first footrest link is located behind the second footrest link. The upper ends of the first footrest link and the second footrest link are both rotatably connected to the first mounting member; the rear end of the third footrest link is rotatably connected to the lower end of the first footrest link, the rear end of the fourth footrest link is rotatably connected to the lower end of the second footrest link, and the middle of the third footrest link is rotatably connected to the middle of the second footrest link; the front end of the third footrest link is rotatably connected to the rear end of the footrest connecting member, and the front end of the fourth footrest link is rotatably connected to the front part of the footrest connecting member. The footrest movement assembly includes four links, forming a scissor-like form to realize the retraction and forward extension of the footrest connecting member, and the structure is simpler than that of traditional mechanical stretching devices.

[0020] Preferably, the front end of the link is rotatably connected to one of the first footrest link, the second footrest link, the third footrest link, or the fourth footrest link.

[0021] Preferably, the linkage is fixedly connected to one of the first footrest link, the second footrest link, the third footrest link, or the fourth footrest link. Considering the lengths of the link and the actuator, it is more appropriate to arrange the link and the linkage on the first footrest link, which can minimize the lengths of the link and the actuator, thereby reducing costs.

[0022] Preferably, the front end of the backrest connecting member is rotatably connected to the second mounting member, and the rear end of the backrest connecting member is rotatably connected to the link. When the footrest movement assembly drives the footrest connecting member to extend forward, the link moves forward to drive the rear end of the backrest connecting member forward, causing the backrest connecting member to rotate backward, thereby realizing the lying posture of the sofa with the footrest extended forward and the backrest reclined.

[0023] Preferably, the first mounting member and the second mounting member are plate members.

[0024] Preferably, an installation auxiliary member is provided below the seat frame. The installation auxiliary member includes connection portions at the front and rear ends and an installation rod located between the connection portions. There is a gap between the installation rod and the seat frame. The installation auxiliary member is configured to fix the seat portion onto the seat frame. After winding the edge of the seat portion around the installation rod, the edge of the seat portion is clamped with a C-shaped nail on the installation rod to complete the installation of the seat portion.

[0025] The design concept, idea and beneficial effects of the present utility model adopting the above technical solution are as follows:

[0026] In this solution, the frame serves as the supporting main body to replace the substrate or base at the lower part of the traditional mechanical stretching device. At the same time, the seat frame is integrated into the frame, reducing the connecting rods and components related to the seat frame and its movement in the traditional mechanical stretching device. In the movement unit, except for the necessary footrest connecting piece and back connecting piece, there are only the footrest movement assembly and the connecting rod. On the premise of ensuring that the mechanical stretching device can move to enable the sofa for users to sit and lie down, the number of rods in the movement unit is greatly reduced, and the mechanical stretching device is streamlined to the greatest extent, thereby reducing the material and assembly costs of production.

[0027] Moreover, since the frame serves as the supporting main body, the movement unit does not have to be connected downward to the lower part of the mechanical stretching device, leaving space below the movement unit. That is, the frame is the main support, the seat frame is part of the frame and remains stationary with the ground, the movement unit is suspended on the frame and is not connected to the lower end of the frame. And because the movement unit is suspended on the seat frame, a large space is left in the frame, which can be used to place other components of the sofa and be packaged together to reduce the packaging and transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional structural schematic diagram of the sofa in the sitting posture of the use state of the present utility model in the embodiment;

[0029] Figure 2 A front view of the sofa in the sitting posture of the use state of the present utility model in the embodiment;

[0030] Figure 3 A three-dimensional structural schematic diagram of the sofa in the packaging state of the present utility model in the embodiment;

[0031] Figure 4 A three-dimensional structural schematic diagram of the sofa after removing the backrest cushion in the packaging state of the present utility model in the embodiment;

[0032] Figure 5 A three-dimensional structural schematic diagram of the back frame of the present utility model installed on the mechanical stretching device in the embodiment;

[0033] Figure 6 A three-dimensional structural schematic diagram of the mechanical stretching device of the present utility model in the embodiment;

[0034] Figure 7 A schematic diagram of the internal space division of the mechanical stretching device of the present utility model in the embodiment;

[0035] Figure 8 A three-dimensional structural schematic diagram of the frame of the present utility model in the embodiment;

[0036] Figure 9 This is a schematic perspective view of the back frame of the present utility model in an embodiment;

[0037] Figure 10 This is a schematic perspective view of the mechanical extension device and the back frame in the sofa in the lying posture of the use state of the present utility model in an embodiment;

[0038] Figure 11 This is a schematic view of the armrest member being installed on the armrest frame in an embodiment of the present utility model;

[0039] Figure 12 This is a schematic perspective view of the mechanical extension device and the back frame in the sofa in the sitting posture of the use state of the present utility model in an embodiment;

[0040] Figure 13 This is a schematic perspective view of the mechanical extension device and the back frame in the sofa in the lying posture of the use state of the present utility model in an embodiment Figure 2 .

[0041] Each reference numeral is: 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; plugging 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

[0042] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below in conjunction with 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.

[0043] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0044] In the description of the present utility model, terms such as "first", "second", "third", etc. are only for the purpose of description and cannot be construed as indicating or implying relative importance.

[0045] The specific embodiments of the present utility model are as follows:

[0046] As Figures 1-4 shown, the present utility model provides a mechanical stretching device, which is applied to a sofa. The sofa includes the mechanical stretching device, a footrest 1, a seat part 2, a backrest 3, and two armrest parts 4 symmetrically arranged on both sides of the mechanical stretching device. The footrest 1 is arranged on the front side of the mechanical stretching device, the seat part 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, the sofa has a sitting posture and a lying posture, and is used for packaging and transportation in the packaging state; the footrest 1 is configured to support the legs and feet of the human body when the sofa is in the lying posture, the seat part 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 parts 4 are configured to support the arms of the human body.

[0047] As Figures 5-8 、12 shown, the mechanical stretching device includes:

[0048] A frame 5, configured to be the main support of the mechanical stretching device; the frame 5 includes a seat frame 501 for installing the seat part 2, and the seat frame 501 is located at the upper end of the frame 5;

[0049] Two motion units symmetrically arranged on the left and right of 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 piece 6, a back connecting piece 7, and a connecting rod 8. The footrest connecting piece 6 is configured to connect the footrest 1, the back connecting piece 7 is configured to connect the backrest 3, the footrest motion component is configured to drive the footrest connecting piece 6 to move, and the connecting rod 8 is configured to link the footrest motion component and the back connecting piece 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 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 respectively rotatably connected to the footrest motion component and the back connecting piece 7;

[0050] A linkage 9, arranged between the two motion units, and the left and right ends of the linkage 9 are respectively connected to the two motion units;

[0051] An actuator 28, whose front and rear ends are respectively installed on the frame 5 and the linkage 9, and the actuator 28 is configured to drive the motion unit to move.

[0052] The frame 5 serves as the supporting main body to replace the substrate or base 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 rods 8 and components related to the seat frame 501 and its movement in the traditional mechanical stretching device. In the movement unit, except for the necessary footrest connecting piece 6 and backrest connecting piece 7, there are only the footrest movement assembly and the connecting rod 8. On the premise of ensuring that the mechanical stretching device can move to enable the sofa for users to sit and lie down, the rods in the movement unit are greatly reduced, and the mechanical stretching device is streamlined to the greatest extent, thereby reducing the material and assembly costs of production.

[0053] Moreover, as the supporting main body, the frame 5 enables the movement unit not to be necessarily connected downward to the lower part of the mechanical stretching device, leaving space below the movement unit. That is, the frame 5 is the main support, the seat frame 501 is part of the frame 5 and remains stationary with the ground, the movement unit is suspended on the frame 5 and is not connected to the lower end of the frame 5. And because the movement unit is suspended on the seat frame 501, a large space will be left in the frame 5, which can be used to place other components of the sofa and be packaged together to reduce the packaging and transportation costs.

[0054] Specifically, the frame 5 further includes armrest frames 502 located on the left and right sides. The two armrest frames 502 are vertically arranged, the seat frame 501 is horizontally arranged, and the two movement 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 stretching device.

[0055] Furthermore, the frame 5 is a cuboid frame 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, and 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, and 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, and 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 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 frame 502 to facilitate the installation of the seat part 2 and the armrest member 4.

[0056] The frame 5 further includes a first connecting rod 511 and a second connecting rod 512. The first connecting rod 511 is located in front 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 bar 55 and the second left vertical bar 56; the left and right ends of the second connecting rod 512 are respectively fixedly connected to the second left vertical bar 56 and the second right vertical bar 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 member 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.

[0057] 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 backrest connecting member 7 is rotatably connected to the second mounting member 11; the seat frame 501 is used to connect the seat portion 2, and the first mounting member 10 and the second mounting member 11 can avoid the connection positions of the connection points of the backrest connecting member 7 and the footrest movement assembly with 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.

[0058] 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, which are in the form of scissors to realize the retraction and forward extension of the footrest connecting member 6, and the structure is simpler than that of traditional mechanical stretching devices.

[0059] The connecting rods 8 are arranged in the front-rear direction. The front end of the backrest connecting member 7 is rotatably connected to the second mounting member 11, and the rear end of the backrest 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 backrest connecting member 7 forward, causing the backrest connecting member 7 to rotate backward, so as to realize the lying posture of the sofa with the footrest extended forward and the backrest reclined; 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.

[0060] Regarding the installation of the seat portion 2: As Figures 6-8As shown in the figure, an installation auxiliary part 16 is provided below the seat frame 501, and the installation auxiliary part 16 is also provided below 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 part 16 includes connecting parts 161 at the front and rear ends and an installation rod 162 located between the connecting parts 161. There is a gap between the installation rod 162 and the seat frame 501. The installation auxiliary part 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 nail on the installation rod 162 to complete the installation of the seat part 2; moreover, in the use state and the packaging state, the seat part 2 is installed on the mechanical extension device; when the consumer receives the sofa, there is no need to install the seat part 2, which simplifies the installation steps.

[0061] Regarding the packaging and installation of the backrest 3: Further, as Figures 1-10 shown in FIGS. 13, there is a receiving space 17 on the mechanical extension device that opens downward and / or backward. In the packaging state, the backrest 3 is placed in the receiving space 17 of the mechanical extension device; by leaving enough space in the mechanical extension device to place the backrest 3, the backrest 3 can enter the receiving space 17 in the packaging state. When packaging, the packaging volume relative to only the volume occupied by the mechanical extension device can be arranged more compactly during transportation, and there is no need to perform additional packaging on the backrest 3, thereby reducing the cost of packaging and transportation; when the consumer receives it, the sofa can be put into the use state by simply installing the backrest 3 at the rear end of the mechanical extension device; in the packaging 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 place 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 extension device, however, the rear of the mechanical extension device is blocked by the fabric cover. Therefore, when packaging, the backrest 3 can be stuffed into the receiving space 17 from bottom to top. Specifically:

[0062] 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; a general space is formed within the frame 5, and the general space includes the occupied space 18 and the accommodation space 17. In the packaged state, the sofa is in the sitting posture, the movement unit is within the occupied space 18, and the backrest 3 is within the accommodation space 17; within the general space of the frame 5, in addition to the occupied space 18 occupied by the movement unit, there is also the accommodation space 17 for placing the backrest 3 in the packaged state. Therefore, the general space is the internal space in a traditional mechanical stretching device, while the accommodation space 17 is not the internal space in a traditional mechanical stretching device. The existence of the accommodation 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 entire movement unit is located at a position slightly above the general space. The frame 5 leaves the accommodation space 17 below the movement unit; and the structure of the movement unit is simple enough to vacate a sufficiently large accommodation space 17.

[0063] The accommodation space 17 is located between two armrest frames 502. 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 disposed in the middle of the second left vertical rod 56 and the second right vertical rod 59. The second connecting rod 512 is not disposed 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 accommodation 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 accommodation space 17.

[0064] 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 of the frame 5 can be opened. Due to this opening and the avoidance of the second connecting rod 512, in the packaged state, the backrest 3 can be more conveniently and easily placed into the accommodation 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.

[0065] Furthermore, the lowest height of the connecting rod 8 is higher than that of the second connecting rod 512, and the lowest height of the back connecting member 7 is higher than that of the second connecting rod 512. The positions of the connecting rod 8 and the back connecting member 7 are such that the back connecting member 7 does not affect the placement of the backrest 3 into the accommodation space 17.

[0066] The back connecting member 7 includes an insertion piece 71, and a socket member 19 is provided on the backrest 3. A slot 20 is formed in the socket member 19. In the use state, the insertion piece 71 is inserted and cooperated with the socket member 19. Specifically, a retaining seat 21 is provided at the upper end of the socket 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, the insertion piece 71 is inserted into the socket member 19, and the elastic flap 22 is snapped into the locking hole 23. The connection between the backrest 3 and the back connecting member 7 is realized through the insertion and cooperation of the insertion piece 71 and the socket member 19. 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. The retaining seat 21 can prevent the insertion piece 71 from exceeding the upper part of the socket member 19, ensuring the success rate of the connection between the socket member 19 and the insertion piece 71. After the socket member 19 and the insertion piece 71 are inserted, the locking is completed by the snap connection of the elastic flap 22 and the locking hole 23, so that the connection between the backrest 3 and the back connecting member 7 is more stable.

[0067] In addition, the backrest 3 includes a back frame 31 and a soft pad 32 covering the outside of the back frame 31. The soft pad 32 has elasticity, and the size of the back frame 31 is smaller than the size of the accommodation space 17. Since the soft pad 32 has elasticity, even if the volume of the soft pad 32 is larger than the volume of the accommodation space 17, the soft pad 32 can still be squeezed and stuffed into the accommodation space 17.

[0068] Regarding the packaging and installation of the armrests:

[0069] As Figures 1-8 shown in FIGS. 11, the 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 packaged state, the two armrest members 4 are stacked on the mechanical extension device. The armrest member 4 is used to support the human arm. The armrest member 4 can also be detached from the mechanical extension device in the packaged state and stacked on the mechanical extension device, so as to reduce the space occupied during packaging in the left-right direction. Specifically:

[0070] The armrest member 4 includes a vertical installation 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 installation portion 41. The supporting portion 42 is configured to support the human arm, and the installation portion 41 is configured to be connected to the armrest frame 502. In the packaged state, the installation 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 packaged 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 installation 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.

[0071] Furthermore, the armrest frame 502 is provided with mounting holes 24 that penetrate the armrest frame 502 from left to right; the armrest member 4 is provided with a positioning member 25, and 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 that protrudes 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 operations, 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.

[0072] The overall structure is simplified by integrating the armrest frame 502 into the frame 5, laying the foundation for simple and quick assembly; when installing the armrest member 4 onto the armrest frame 502 of the frame 5, 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 the need for complicated operations such as screwing, and even consumers can easily complete it; thus, both the disassembly and assembly of the armrest member 4 are achieved to reduce the cost of packaging and transportation, 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, and the installation of the armrest member 4 can be achieved using existing parts, which reduces costs and is simple and convenient to implement.

[0073] The positioning member 25 is provided on the mounting portion 41; to further facilitate the installation of the armrest member 4, the thickness and volume of the armrest member 4 will be smaller than those of 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 and lighter, making it easier for consumers to install, and at the same time saving materials and the cost of packaging and transportation; because 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.

[0074] Specifically, both the positioning members 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 provided in the middle of the first longitudinal rod, and one mounting hole 24 is provided at each of the front end and the rear end of the second longitudinal rod. The number of the positioning members 25 and the mounting holes 24 is three, and the number is not large, which 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 position where the mounting hole 24 is opened 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, so as to form a triangular 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, facilitating consumers to reach into the mechanical extension unit to install the locking member 26.

[0075] 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, so as to reduce the cost of the armrest member 4.

[0076] The sofa further includes support feet 27. In the use state, the support feet 27 are detachably arranged at the bottom of the mechanical extension device; the support feet 27 are configured to be removed from the mechanical extension device in the packaging state; after the support feet 27 are 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 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 cost.

Claims

1. A mechanical stretching device, characterized in that: include: A frame configured as the main body support of the mechanical extension device; the frame includes a seat frame for mounting the seat portion, the seat frame being located at an upper end portion of the frame; Two motion units are symmetrically arranged on the frame, and the two motion units are suspended on the seat frame; the motion unit includes a footrest motion assembly, a footrest connecting piece, a back connecting piece and a connecting rod, the footrest connecting piece is configured to connect the footrest piece, the back connecting piece is configured to connect the backrest, the footrest motion assembly is configured to drive the footrest connecting piece to move, and the connecting rod is configured to link the footrest motion assembly with the back connecting piece; one end of the footrest motion assembly is rotatably connected to the seat frame, and the other end of the footrest motion assembly is rotatably connected to the footrest connecting piece; the back connecting piece is rotatably connected to the seat frame, and the front and rear ends of the connecting rod are rotatably connected to the footrest motion assembly and the back connecting piece respectively; A linkage member is arranged between the two motion units, and the left and right ends of the linkage member are respectively connected to the two motion units; The actuator has front and rear ends respectively mounted on the frame and the linkage, and the actuator is configured to drive the motion unit to move.

2. The mechanical stretching device according to claim 1, characterized in that: The frame also includes armrest frames located on the left and right sides, the two armrest frames are vertically arranged, the seat frame is horizontally arranged, and the two motion units are located between the two armrest frames; the armrest frames are configured for installing armrest pieces.

3. The mechanical stretching device according to claim 2, characterized in that: The frame is a rectangular frame structure, including a first cross bar, a second cross bar, a first left longitudinal bar, a first right longitudinal bar, a first left vertical bar, a second left vertical bar, a second left longitudinal bar, a first right vertical bar, a second right vertical bar, and a second right longitudinal bar; the seat frame includes a first cross bar, a second cross bar, a first left longitudinal bar and a first right longitudinal bar; the armrest frame located on the left side includes a first left longitudinal bar, a first left vertical bar, a second left vertical bar and a second left longitudinal bar, and the armrest frame located on the right side includes a first right longitudinal bar, a first right vertical bar, a second right vertical bar and a second right longitudinal bar; the first cross bar is located at the front side of the second cross bar, the left and right ends of the first cross bar are fixedly connected to the front ends of the first left longitudinal bar and the first right longitudinal bar, and the left and right ends of the second cross bar are fixedly connected to the rear ends of the first left longitudinal bar and the first right longitudinal bar; the first left vertical bar is located at the front side of the second left vertical bar, the front and rear ends of the first left longitudinal bar are respectively fixedly connected to the upper ends of the first left vertical bar and the second left vertical bar, and the front and rear ends of the second left longitudinal bar are respectively fixedly connected to the lower ends of the first left vertical bar and the second left vertical bar.

4. The mechanical stretching device according to claim 3, characterized in that: The frame also includes a first connecting rod and a second connecting rod, 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 first left vertical rod and the second left vertical rod; the left and right ends of the second connecting rod are respectively fixedly connected to the second left vertical rod and the second right vertical rod; the rear end of the actuator is rotatably connected to the second connecting rod, and the front end of the actuator is rotatably connected to the linkage.

5. The mechanical stretching device according to claim 4, characterized in that: In the height direction, the second connecting rod is arranged at the middle of the second left vertical rod and the second right vertical rod.

6. The mechanical stretching device according to claim 4, characterized in that: The second connecting rod is 100-120 mm higher than the lower surface of the handrail frame.

7. The mechanical stretching device according to claim 1, characterized in that: The front end of the seat frame is provided with a first mounting piece, and the rear end of the seat frame is provided with a second mounting piece; the footrest motion component is rotatably connected to the first mounting piece, and the back connecting piece is rotatably connected to the second mounting piece.

8. The mechanical stretching device according to claim 7, characterized in that: The footrest movement assembly includes a first footrest link, a second footrest link, a third footrest link and a fourth footrest link. The first footrest link is located behind the second footrest link, and the upper end of the first footrest link and the upper end of the second footrest link are both rotatably connected to the first mounting member; the rear end of the third footrest link is rotatably connected to the lower end of the first footrest link, the rear end of the fourth footrest link is rotatably connected to the lower end of the second footrest link, and the middle part of the third footrest link is rotatably connected to the middle part of the second footrest link; the front end of the third footrest link is rotatably connected to the rear end of the footrest connecting member, and the front end of the fourth footrest link is rotatably connected to the front of the footrest connecting member; the front end of the connecting rod is rotatably connected to one of the first footrest link, the second footrest link, the third footrest link or the fourth footrest link; the linkage member is fixedly connected to one of the first footrest link, the second footrest link, the third footrest link or the fourth footrest link.

9. The mechanical stretching device according to claim 7, characterized in that: The front end of the back connecting member is rotatably connected to the second mounting member, and the rear end of the back connecting member is rotatably connected to the connecting rod; the first mounting member and the second mounting member are plate members.

10. The mechanical stretching device according to claim 1, characterized in that: An installation auxiliary part is provided under the seat frame. The installation auxiliary part includes connecting parts at the front and rear ends and a mounting rod located between the connecting parts. There is a gap between the mounting rod and the seat frame. The installation auxiliary part is configured to fix the seat part on the seat frame.

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