Extension structure of sofa and sofa

Abstract

The utility model discloses a sofa stretching structure and a sofa, and relates to the technical field of furniture, the sofa stretching structure comprises a seat frame body, a leg support assembly is arranged in the seat frame body, a backrest assembly is rotatably arranged at the rear part of the seat frame body, and the seat frame body is connected with the leg support assembly through a first guide structure; the leg support assembly can extend out of the front portion of the seat frame body in a translation mode under the action of the first guide structure, and the included angle between the backrest assembly and the seat frame body is adjusted through a second guide structure. According to the stretching structure of the sofa, the stretching structure of the leg support position is optimized, so that the leg support does not occupy the lower space of the sofa seat in the stretching process.

Description

Technical Field

[0001] The present application relates to the technical field of furniture, and in particular to an extension structure of a sofa and the sofa. Background Art

[0002] The extension of the footrest of the existing sofa seat structure is mostly achieved by the rotation and swinging of the connecting rod structure. If the connecting rod structure is a single connecting rod, the connecting rod swings along a fan-shaped trajectory. When the connecting rod is flipped to a vertical state, the connecting rod will occupy a large part of the space under the sofa seat, and the true high-leg design cannot be achieved (the high-leg design generally refers to the support foot height of the sofa seat being more than 13 cm, and there is no mechanism encroaching within this height range). Utility Model Content

[0003] The present application aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present application provides an extension structure of a sofa, which optimizes the extension structure of the leg rest position so that the extension process of the leg rest does not occupy the lower space of the sofa seat.

[0004] The embodiment of the present application also provides an extension structure of a sofa.

[0005] According to an embodiment of the first aspect of the present application, there is provided an extension structure of a sofa, comprising a seat frame body, a leg rest assembly being arranged inside the seat frame body, a backrest assembly being rotatably arranged at the rear of the seat frame body, the seat frame body and the leg rest assembly being connected via a first guide structure, the leg rest assembly being able to extend from the front of the seat frame body in a translational manner under the action of the first guide structure, and the angle between the backrest assembly and the seat frame body being adjusted via a second guide structure.

[0006] The extension structure of the sofa has at least the following beneficial effects: optimizing the connection between the leg rest assembly and the seat frame body, setting the leg rest assembly to be retractable in the seat frame body, and enabling the leg rest assembly to extend from the front of the seat frame body in a translational manner through the first guide structure. Compared with the traditional connecting rod flip design, the structural design is more reasonable and compact. When extended or in the retracted state, the leg rest assembly and the first guide structure do not occupy the lower space of the seat frame body; further, the connection between the backrest assembly and the seat frame body is also optimized, and the angle adjustment between the backrest assembly and the seat frame body is achieved through the second guide structure. Regardless of whether the backrest assembly is in the backrest state or the semi-lying state, the second guide structure will not occupy the lower space of the seat frame body. When the extension structure of the present application is used on a sofa, the volume of the entire sofa can be made more compact in the non-expanded state, realizing a high-leg design in the true sense.

[0007] According to the extension structure of the sofa described in the first aspect of the embodiment of the present application, the first guide structure includes a first guide groove and a first connecting member, the first guide groove is arranged on the seat frame body, and the part of the first connecting member fixedly connected to the leg rest assembly is located in the first guide groove.

[0008] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, the seat frame body includes two symmetrically arranged seat frame slides, the leg rest assembly is located between the two seat frame slides, the seat frame slide is provided with the first guide groove, and the first connecting member is provided on both sides of the leg rest assembly.

[0009] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, the first connecting member includes two first connecting members arranged at intervals, one end of the first connecting member is connected to the leg support assembly, and the other end passes through the first guide groove.

[0010] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, the first guide groove extends along the length direction of the seat frame body, the part of the first guide groove close to the front part of the seat frame body is an arc segment, and when the first connecting member slides in the arc segment, the angle between the leg support assembly and the seat frame body gradually increases or decreases.

[0011] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, the second guide structure includes a second connecting member and a frame fixing member, the frame fixing member has a second guide groove, a portion of the second connecting member passes through the second guide groove and is fixedly connected to the seat frame body, the frame fixing member is connected to the backrest assembly through a connecting rod member, and when the frame fixing member moves in a translational manner under the action of the second connecting member, the connecting rod member drives the backrest assembly to flip.

[0012] According to the sofa extension structure described in the embodiment of the first aspect of the present application, the second guide groove extends along the length direction of the frame fixing component, and the second guide groove is an arc groove.

[0013] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, one end of the frame fixing member away from the leg rest assembly is rotatably connected to one end of the connecting rod member, and the other end of the connecting rod member is rotatably connected to the backrest assembly, and when the second connecting member moves to the end of the second guide groove away from the front of the seat frame body, the end of the frame fixing member away from the front of the seat frame body is close to the rear of the seat frame body.

[0014] According to the extension structure of the sofa described in the embodiment of the first aspect of the present application, the extension structure of the sofa also includes a first driving component and a second driving component, the first driving component is used to drive the leg rest component to switch between an extended state and a retracted state, and the second driving component cooperates with the second guide structure to enable the angle between the backrest component and the seat frame body to be adjusted within a range of 100° to 160°.

[0015] According to an embodiment of the second aspect of the present application, a sofa is provided, comprising the extension structure of the sofa described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 is a schematic diagram of a fully retracted extended structure of a sofa in an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a leg support assembly of an extension structure of a sofa in an extended state in an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of an embodiment of the present application, in which the extension structure of the sofa is fully extended;

[0020] Figure 4 This is a schematic diagram of the connection between the seat frame body and the backrest assembly in the embodiment of the present application. Figure 1 ;

[0021] Figure 5 This is a schematic diagram of the connection between the seat frame body and the backrest assembly in the embodiment of the present application. Figure 2 ;

[0022] Figure 6 This is a schematic diagram of the structure of the seat frame skateboard in the embodiment of the present application. Figure 1 ;

[0023] Figure 7 This is a schematic diagram of the structure of the seat frame skateboard in the embodiment of the present application. Figure 2 ;

[0024] Figure 8 is a structural schematic diagram of a leg support assembly in an embodiment of the present application;

[0025] Fig. 9 is a structural schematic diagram of a leg support skateboard in an embodiment of the present application;

[0026] Fig.10 is a schematic diagram of a second guide structure in an embodiment of the present application;

[0027] Fig.11 It is a schematic diagram of the structure of the frame fixing member in an embodiment of the present application. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0032] Reference Figures 1 to 3 The embodiment of the present application provides an extension structure of a sofa, which specifically includes a seat frame body 100, a leg support assembly 400 and a backrest assembly 200.

[0033] The leg support assembly 400 is disposed in the seat frame body 100 and connected via a first guide structure. The leg support assembly 400 can extend from the front of the seat frame body 100 in a translational manner under the action of the first guide structure. Figure 1 As shown, the leg support assembly 400 is in a state of being stored in the seat frame body 100. Figure 2 and Figure 3 The leg support assembly 400 is shown in an unfolded and extended state.

[0034] The backrest assembly 200 is rotatably arranged on the seat frame body 100, and a second guide structure 300 is further connected between the backrest assembly 200 and the seat frame body 100. The angle between the backrest assembly 200 and the seat frame body 100 is adjusted by the second guide structure 300. In a normal state, the angle between the backrest assembly 200 and the seat frame body 100 is adjusted to Figure 1 When the backrest assembly 200 is in the state shown in the figure, the angle between the backrest assembly 200 and the seat frame body 100 is adjusted to Figure 3 Shown in expanded state.

[0035] Compared with the traditional extension structure design, the present application optimizes the connection between the leg rest assembly 400 and the seat frame body 100, and configures the leg rest assembly 400 to be retractable in the seat frame body 100. The leg rest assembly 400 can be extended from the front of the seat frame body 100 in a translational manner through the first guide structure. Compared with the traditional connecting rod flip design, the structural design capable of translation in the present application is more reasonable and compact. When extended or in the storage state, the leg rest assembly 400 and the first guide structure do not occupy the lower space of the seat frame body 100; further, the connection between the backrest assembly 200 and the seat frame body 100 is also optimized. The angle adjustment between the backrest assembly 200 and the seat frame body 100 is realized by the second guide structure 300. Regardless of whether the backrest assembly 200 is in the backrest state or the semi-lying state, the second guide structure 300 will not occupy the lower space of the seat frame body 100. When the extension structure of the present application is used on a sofa, in a non-expanded state, the volume of the entire sofa can be made more compact, realizing a high-leg design in a true sense.

[0036] In some examples, reference Figures 6 to 9 The first guide structure includes a first guide groove 113 and a first connecting member 430. The first guide groove 113 is provided on the seat frame body 100, and the portion of the first connecting member 430 fixedly connected to the leg support assembly 400 is located in the first guide groove 113. The first guide groove 113 and the first connecting member 430 cooperate with each other so that the leg support assembly 400 can extend from the front of the seat frame body 100 in a translational manner without occupying the lower space of the seat frame body 100.

[0037] Specifically, Figures 1 to 5 As shown, the seat frame body 100 includes two symmetrically arranged seat frame slide plates 110, and the leg support assembly 400 is located between the two seat frame slide plates 110. Figure 6 As shown, the first guide groove 113 is provided on the opposite sides of the two seat frame slide plates 110, and the first connecting member 430 is provided on both sides of the leg support assembly 400. The two sets of first guide structures are provided to make the translation of the leg support assembly 400 more stable.

[0038] Furthermore, the seat frame body 100 further includes a connecting rod 120, and the two seat frame slide plates 110 are connected by the connecting rod 120, and the first guide groove 113 runs through both sides of the seat frame slide plates 110. Figure 6 and Figure 7 As shown, the seat frame skateboard 110 includes a plate-shaped seat frame skateboard body 111, a first guide groove 113 is arranged on the seat frame skateboard body 111, and a reinforcing portion 112 is bent on the upper side of the seat frame skateboard body 111, and the reinforcing portion 112 can improve the structural strength of the seat frame skateboard body 111.

[0039] In some embodiments, Figure 8 As shown, the leg support assembly 400 includes two symmetrical leg support slide plates 410, two reinforcing rods 420 are used to form a frame between the two leg support slide plates 410, and the first connecting member 430 is disposed on the back side of the two leg support slide plates 410. Fig. 9 As shown, the leg support slide 410 includes a plate-shaped leg support slide body 411, and a connecting plate 412 is bent on the upper side of the leg support slide body 411. The setting of the connecting plate 412 can strengthen the structural strength of the entire slide 410 on the one hand, and facilitate the connection of other components on the other hand. Further, two first connecting ears 413 are provided on the lower side of the leg support slide body 411. The first connecting ears 413 are used to support and connect the reinforcement rod 420. The reinforcement rod 420 and the first connecting ears 413 are locked by riveting or bolting.

[0040] The first connecting member 430 includes two first connecting members 432 spaced apart from each other. The same end of the two first connecting members 432 is connected to the leg rest assembly 400. The other ends of the two first connecting members 432 pass through the first guide slot 113. The two first connecting members 432 limit the freedom of movement of the leg rest assembly 400 to ensure that the leg rest assembly 400 is accurately guided and that the leg rest assembly 400 can perform translational movement instead of rotation. Specifically, the first connecting member 430 also includes a second connecting member 431. The ends of the two first connecting members 432 belonging to the same first connecting member 430 are connected to the second connecting member 431. When the leg rest assembly 400 is assembled with the seat frame body 100, as shown in FIG. Figures 1 to 3 As shown, the second connecting member 431 is located on the back side of the two seat frame slides 110, that is, the first connecting member 430 on the leg support slide 410 passes through the first guide groove 113 provided on the seat frame slide 110 and is fixed to the second connecting member 431, and the second connecting member 431 cooperates with the first connecting member 432 to jointly limit the leg support assembly 400 from being separated from the seat frame body 100.

[0041] In some examples, such as Figures 5 to 7As shown, the first guide groove 113 extends along the length direction of the seat frame body 100, and the portion of the first guide groove 113 close to the front of the seat frame body 100 is an arc segment 1131. When the first connecting member 430 slides in the arc segment, the angle between the leg support assembly 400 and the seat frame body 100 gradually increases or decreases. Specifically, the first guide groove 113 extends along the length direction of the seat frame slide plate 110. In the embodiment of the present application, the first guide groove 113 includes an arc segment 1131 and a straight segment 1132. The arc segment 1131 is set to be an arc bent upward. When the first connecting member 432 closest to the arc segment 1131 enters the arc segment 1131 of the first guide groove 113 from the straight segment 1132, the leg support assembly 400 is lifted upward, thereby gradually increasing the angle of the leg support assembly 400 compared with the seat frame body 100. When the first connecting member 432 closest to the arc segment 1131 returns from the arc segment 1131 to the straight segment 1132, the leg support assembly 400 is lifted downward and slowly retracted into the seat frame body 100, thereby gradually decreasing the angle of the leg support assembly 400 compared with the seat frame body 100. When the extension structure of the present application is used on a sofa, it can meet the requirements of different groups of people for the height of the leg support. Of course, in other embodiments, the arc segment 1131 may also be configured as an arc that bends downward.

[0042] In addition, the extension structure of the sofa of the present application further includes a first driving assembly 500, which is used to drive the leg support assembly 400 to switch between the extended state and the retracted state. Specifically, the first driving assembly 500 includes a first motor 510, which is fixed to the seat frame slide 110 of the seat frame body 100, and the first motor 510 is connected to the leg support assembly 400 through a gear rack structure. Specifically, the gear rack structure includes a gear 520 and a rack 530, the gear 520 is fixed to the output shaft of the first motor 510, and the rack 530 is fixed to the connecting plate 412 of the leg support slide 410. After the leg support assembly 400 is connected to the seat frame body 100 through the first guide structure, no matter the leg support assembly 400 is in the extended state or the retracted state, the gear 520 and the rack 530 are in a meshing state, and the automatic extension or automatic retraction of the leg support assembly 400 is realized by the setting of the first driving assembly 500.

[0043] like Figures 1 to 7 As shown, the second guide structure 300 includes a second connecting member 130 and a frame fixing member 310, wherein the second guide structure 300 includes a second connecting member 130 and a frame fixing member 310. Fig.10 and Fig.11It can be understood that the frame fixing part 310 has a second guide groove 312, and a portion of the second connecting member 130 passes through the second guide groove 312 and is fixedly connected to the seat frame body 100. The frame fixing part 310 is connected to the backrest assembly 200 through the connecting rod part 220. When the frame fixing part 310 moves in a translational manner under the action of the second connecting member 130, the connecting rod part 220 drives the backrest assembly 200 to flip.

[0044] Specifically, the second guide structure 300 includes two frame fixing members 310, which are respectively located on both sides of the seat frame body 100. The second connecting member 130 is provided on both sides of the seat frame body 100. The ends of the two frame fixing members 310 are connected by a rod 320, so that the two frame fixing members 310 and the rod 320 form a U-shaped frame. Under the cooperation and connection of the second connecting member 130 and the second guide groove 312, the frame is in a state of being sleeved on the rear part of the seat frame body 100. Specifically, as shown in FIG. Fig.10 As shown, an L-shaped block 330 is provided at the connection between the frame fixing member 310 and the rod member 320. The L-shaped block 330 supports the rod member 320, and the L-shaped block 330 and the rod member 320 are connected by bolts. Figure 1 and Figure 2 As shown, when the backrest assembly 200 is in the backrest state, the end of the frame is close to the rear of the level seat frame body 100; Figure 3 and Figure 4 As shown, when the backrest assembly 200 is in the extended state, the frame moves in a direction away from the rear of the seat frame body 100, and then the backrest assembly 200 can be turned over through the connecting rod 220. It should be noted that both frame fixing members 310 are connected to the backrest assembly 200 through the connecting rod 220, and specifically, the frame fixing member 310 is connected to the backrest support plate 210 of the backrest assembly 200 through the connecting rod 220.

[0045] It should be noted that the second guide groove 312 extends along the length direction of the frame fixing part 310. When the second guide groove 312 is a straight groove, the movement of the frame fixing part 310 is a translational movement. When the second guide groove 312 is an arc groove, the frame fixing part 310 performs a circular motion. In the embodiment of the present application, the curvature of the arc groove is set to be larger, so that the trajectory of the circular motion of the frame fixing part 310 is not obvious, but it can make the flipping of the backrest assembly 200 smoother and more comfortable.

[0046] like Fig.11 As shown, the frame fixing member 310 is a plate, and a connecting ear 311 for connecting with the outside is provided at the lower part of the frame fixing member 310. In actual use, the frame fixing member 310 is connected to other external components through the connecting ear 311, so that when the extension structure of the sofa of the present application is extended, the seat frame body 100 performs translational or circular motion.

[0047] like Figure 3 and Figure 4 As shown, a hinge portion 114 is provided on the upper side of the seat frame slide plate 110, and the end of the backrest support plate 210 is hingedly connected to the hinge portion 114, and one end of the frame fixing member 310 away from the leg rest assembly 400 is rotatably connected to one end of the connecting rod member 220, and the other end of the connecting rod member 220 is rotatably connected to the backrest assembly 200, that is, the other end of the connecting rod member 220 is hingedly connected to the backrest support plate 210, and when the second connecting member 130 moves to the end of the second guide groove 312 away from the front of the seat frame body 100, the end of the frame fixing member 310 away from the front of the seat frame body 100 is close to the rear of the seat frame body 100. The above design ensures that when the backrest assembly 200 is in the backrest state, the frame fixing component 310 of the entire second guide structure 300 is hidden in the side of the seat frame body 100; when the backrest assembly 200 switches from the backrest state to the unfolded state, the frame fixing component 310 extends out in a translational or circular motion, while not occupying the lower space of the seat frame body 100.

[0048] In some examples, such as Figures 4 to 7 As shown, the second connecting member 130 includes two third connecting members 132 and one fourth connecting member 131. The two third connecting members 132 are arranged at intervals. The ends of the third connecting members 132 are fixed to the seat frame slide 110. Part of the third connecting member 132 passes through the second guide groove 312. The arrangement of the two third connecting members 132 prevents the frame fixing member 310 from rotating. The fourth connecting member 131 is arranged at the ends of the third connecting members 132 to limit the frame fixing member 310 from being separated from the seat frame body 100. At the same time, a gap is formed between the fourth connecting member 131 and the seat frame slide 110 for the frame fixing member 310 to slide, which plays a better guiding role.

[0049] In some examples, the extension structure of the present application further includes a second drive assembly 600, which cooperates with the second guide structure 300 to enable the angle between the backrest assembly 200 and the seat frame body 100 to be adjusted within a range of 100° to 160°. Figure 1 and Figure 2 As shown, in the backrest state, the angle between the backrest assembly 200 and the seat frame body 100 is close to 100°; Figure 3 As shown, in the unfolded state, the angle between the backrest assembly 200 and the seat frame body 100 is close to 160°. In the unfolded state or the backrest state, directly pushing the backrest assembly 200 cannot achieve state switching. Therefore, it is necessary to push the second guide structure 300 to achieve the angle adjustment between the backrest assembly 200 and the seat frame body 100. The setting of the second drive assembly 600 can achieve the angle between the backrest assembly 200 and the seat frame body 100 hovering at any angle between 100° and 160°.

[0050] Specifically, the second drive assembly 600 includes a second motor 610 and a linear electric push rod 620 that cooperates with the second motor 610. One end of the linear electric push rod 620 is hinged to the rod 320, and the moving end of the linear electric push rod 620 is hinged to the connecting rod 120. The linear electric push rod 620 is extended or shortened by the second motor 610, so that the frame fixing member 310 extends in a translational or circular motion, and then the backrest assembly 200 is driven to flip through the connecting rod 220 to adjust the backrest angle of the backrest assembly 200. Of course, in some other embodiments, the second drive assembly 600 can also be a cylinder.

[0051] The embodiment of the present application also provides a sofa using the extension structure of the above-mentioned sofa, which can make the overall structure of the sofa more compact. At the same time, when the sofa is in the unfolded state, the leg rest assembly 400 will not occupy the lower space of the sofa.

[0052] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A sofa extension structure, characterized in that: The invention comprises a seat frame body, wherein a leg rest assembly is arranged inside the seat frame body, a backrest assembly is rotatably arranged at the rear of the seat frame body, the seat frame body and the leg rest assembly are connected by a first guide structure, the leg rest assembly can be extended from the front of the seat frame body in a translational manner under the action of the first guide structure, and the angle between the backrest assembly and the seat frame body is adjusted by a second guide structure.

2. The sofa extension structure according to claim 1, characterized in that: The first guide structure includes a first guide groove and a first connecting member. The first guide groove is arranged on the seat frame body, and the part of the first connecting member fixedly connected to the leg support assembly is located in the first guide groove.

3. The sofa extension structure according to claim 2, characterized in that: The seat frame body includes two symmetrically arranged seat frame slide plates, the leg rest assembly is located between the two seat frame slide plates, the seat frame slide plate is provided with the first guide groove, and the first connecting member is provided on both sides of the leg rest assembly.

4. The sofa extension structure according to claim 3, characterized in that: The first connecting member includes two first connecting members spaced apart from each other, one end of the first connecting member is connected to the leg support assembly, and the other end passes through the first guide groove.

5. The sofa extension structure according to any one of claims 2 to 4, characterized in that: The first guide groove extends along the length direction of the seat frame body, and the portion of the first guide groove close to the front portion of the seat frame body is an arc segment. When the first connecting member slides in the arc segment, the angle between the leg support assembly and the seat frame body gradually increases or decreases.

6. The sofa extension structure according to claim 1, characterized in that: The second guide structure includes a second connecting member and a frame fixing member, the frame fixing member has a second guide groove, a portion of the second connecting member passes through the second guide groove and is fixedly connected to the seat frame body, the frame fixing member is connected to the backrest assembly via a connecting rod, and when the frame fixing member moves in a translational manner under the action of the second connecting member, the connecting rod drives the backrest assembly to flip.

7. The sofa extension structure according to claim 6, characterized in that: The second guide groove extends along the length direction of the frame fixing member, and the second guide groove is an arc groove.

8. The sofa extension structure according to claim 6, characterized in that: One end of the frame fixing member away from the leg support assembly is rotatably connected to one end of the connecting rod member, and the other end of the connecting rod member is rotatably connected to the backrest assembly. When the second connecting member moves to the end of the second guide groove away from the front of the seat frame body, the end of the frame fixing member away from the front of the seat frame body is close to the rear of the seat frame body.

9. The sofa extension structure according to claim 1, characterized in that: The extension structure of the sofa also includes a first drive component and a second drive component, the first drive component is used to drive the leg rest component to switch between an extended state and a retracted state, and the second drive component cooperates with the second guide structure to enable the angle between the backrest component and the seat frame body to be adjusted within a range of 100° to 160°.

10. A sofa, characterized in that: The invention comprises an extended structure of the sofa as claimed in any one of claims 1 to 9.

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