A deformable sofa

Abstract

The utility model relates to life furniture technical field, specifically disclose a deformable sofa, include: sofa base, sofa seat bag, handrail footrest dual -purpose spare, wherein, the deformable sofa has: ride state: sofa seat bag relative sofa base rotates to handrail footrest dual -purpose spare is located in the side surface position of sofa base, and handrail footrest dual -purpose spare rotates to relative sofa seat bag protrudes upward, to as sofa handrail, lie and sleep state: sofa seat bag relative sofa base rotates to handrail footrest dual -purpose spare is located in the front of sofa base, and handrail footrest dual -purpose spare rotates to relative sofa seat bag protrudes forward, to as sofa footrest. The deformable sofa provided by the utility model can solve the problem that the existing sofa needs to be configured with independent footrest components to realize the footrest function, resulting in high manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of living furniture technology, and in particular to a deformable sofa. Background Technology

[0002] Sofas are the primary form of seating in homes, and their function has expanded to include temporary rest and reclining, which has become a common need. Currently, the most common approach to meet this need is to add a flip-up or pull-out independent footrest to the front of the sofa seat. When in use, the independent footrest extends the seat surface, improving reclining comfort.

[0003] However, this traditional solution has a core contradiction: to achieve a function used infrequently, it significantly increases the product's manufacturing cost. Specifically, the separate pedal component itself constitutes a complete sub-assembly, requiring additional frame materials, padding, and fabric, greatly increasing material costs.

[0004] This design approach of configuring independent components specifically for low-frequency functions results in an inherent cost-benefit imbalance, limiting the optimization of product cost-effectiveness.

[0005] Therefore, existing sofas need to be improved to address the issue of high manufacturing costs caused by the need for independent footrest components to enable footrest functionality.

[0006] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] One objective of this invention is to provide a deformable sofa that solves the problem that existing sofas require an independent footrest to function as a footrest, resulting in high manufacturing costs.

[0008] To achieve the above objectives, this utility model provides a deformable sofa, comprising:

[0009] Sofa base;

[0010] The sofa seat cushion is rotatably mounted above the sofa base around a vertical axis;

[0011] The armrest and footrest are dual-purpose components that can be rotated up and down and are installed on the side of the sofa seat.

[0012] The deformable sofa has the following features:

[0013] Seating position: The sofa seat is rotated relative to the sofa base until the armrest and footrest dual-purpose component is located on the side of the sofa base, and the armrest and footrest dual-purpose component is rotated to protrude upward relative to the sofa seat to serve as a sofa armrest;

[0014] Lying down position: The sofa seat is rotated relative to the sofa base until the armrest and footrest dual-purpose component is located in front of the sofa base, and the armrest and footrest dual-purpose component is rotated to protrude forward relative to the sofa seat to serve as a sofa footrest.

[0015] Optionally, a vertical pivot is provided at the geometric center of the sofa seat, which is rotatably connected to the sofa base;

[0016] The axis of the vertical rotating shaft is the vertical axis.

[0017] Optionally, when the deformable sofa is in the sitting state, the armrest and footrest dual-purpose component is in a vertical state, and the top surface of the armrest and footrest dual-purpose component is higher than the top surface of the sofa seat cushion.

[0018] Optionally, when the deformable sofa is in the reclining state, the armrest and footrest dual-purpose components extend horizontally, tilt upwards from back to front, or tilt downwards from back to front.

[0019] Optionally, the armrest and footrest combo unit and the sofa seat cushion are connected by a linkage mechanism.

[0020] Optionally, the linkage mechanism includes:

[0021] A first fixed base plate is fixedly mounted on the sofa seat cushion;

[0022] The second fixed base plate is fixedly mounted on the handrail foot pedal dual-purpose component;

[0023] The first connecting rod has one end hinged to the end of the first fixed base plate away from the handrail foot pedal dual-purpose component;

[0024] The second connecting rod has one end hinged to the other end of the first connecting rod, and the other end of the second connecting rod is hinged to the end of the second fixed base plate near the first fixed base plate.

[0025] The third link is hinged at one end to the end of the first fixed base plate near the handrail foot pedal dual-purpose component, and the middle part of the third link is hinged to the middle part of the second link.

[0026] The fourth link is hinged at one end to the other end of the third link and at the other end of the second fixed base plate away from the first fixed base plate.

[0027] Optional, also includes:

[0028] A direct-drive linkage mechanism is rotatably mounted on the sofa seat, and the drive end of the direct-drive linkage mechanism is hinged to the first linkage member.

[0029] in,

[0030] When the drive end of the linkage direct drive mechanism retracts away from the armrest and footrest dual-purpose component, the linkage mechanism drives the armrest and footrest dual-purpose component to rotate until it protrudes upward relative to the sofa seat.

[0031] When the drive end of the linkage direct drive mechanism extends towards the armrest and footrest dual-purpose component, the linkage mechanism drives the armrest and footrest dual-purpose component to rotate so that it protrudes forward relative to the sofa seat.

[0032] Optional, also includes:

[0033] The sofa backrest is rotatably mounted to the rear end of the sofa base via an angle adjuster.

[0034] Optionally, two sofa cushions are arranged side by side in front of the sofa backrest, and each sofa cushion is provided with a corresponding armrest and footrest dual-purpose component.

[0035] Optionally, both the sofa seat and the sofa backrest include a rigid frame and a soft upholstery covering the outside of the rigid frame;

[0036] When the deformable sofa is in a sitting position, the adjacent soft upholstery layers elastically abut against each other to form a continuous support surface;

[0037] There is a gap between two adjacent rigid frames to allow the corresponding soft cladding layer to pass through after compression.

[0038] The beneficial effects of this utility model are as follows: It provides a deformable sofa with deformable characteristics, specifically manifested in two usage states: a sitting state and a lying-down state.

[0039] When seated, rotate the sofa seat 90° forward to position the armrest and footrest combination piece on the side of the sofa base. At the same time, rotate the armrest and footrest combination piece to the upward protruding position to serve as a sofa armrest, providing lateral support.

[0040] When lying down, rotate the sofa seat 90° in the opposite direction to move the armrest and footrest combination to the front of the sofa base. By rotating the armrest and footrest combination, the combination can be extended forward to serve as a footrest, thus extending the seat length and improving lying comfort.

[0041] During operation, the switching of states relies on the coordinated action of adjusting the orientation of the sofa seat cushions and the angle of the armrest and footrest combination. For example, the user can first rotate the sofa seat cushions to change the position of the armrest and footrest combination, and then operate the armrest and footrest combination to switch functions. This design eliminates the need for traditional independent footrest components by reusing a single component, thereby significantly reducing material costs. This not only improves the product's functional integration and space efficiency but also solves the cost-benefit imbalance caused by adding independent footrest components, making it particularly suitable for multifunctional furniture scenarios with limited living space.

[0042] Therefore, the deformable sofa provided by this utility model can solve the problem that existing sofas require an independent footrest component to realize the footrest function, resulting in high manufacturing costs. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a structural diagram of the deformable sofa in a sitting position, provided in an embodiment.

[0045] Figure 2 This is a schematic diagram of the deformable sofa in a reclining position, provided in an embodiment.

[0046] Figure 3 This is a schematic diagram of the linkage mechanism provided in the embodiment, showing the switching from a sitting state to a lying-down state.

[0047] In the picture:

[0048] 1. Sofa base; 101. Vertical pivot;

[0049] 2. Sofa seat cushions;

[0050] 3. Handrail and foot pedal dual-purpose components;

[0051] 4. Linkage mechanism; 401. First fixed base plate; 402. Second fixed base plate; 403. First link; 404. Second link; 405. Third link; 406. Fourth link;

[0052] 5. Sofa backrest;

[0053] 6. Linkage direct drive mechanism. Detailed Implementation

[0054] In this utility model, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0055] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0056] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0057] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0058] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0059] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0060] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0061] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0062] The direct drive mechanism in this invention can be a linear motor, a cylinder, a hydraulic cylinder, or a motor lead screw and slider assembly, etc.; the rotary drive mechanism can be a servo motor, a stepper motor, or a rotary cylinder, etc.

[0063] This invention provides a deformable sofa that solves the problem that existing sofas require an independent footrest to function as a footrest, resulting in high manufacturing costs.

[0064] See Figure 1 and Figure 2 The deformable sofa provided in this embodiment includes:

[0065] Sofa base 1;

[0066] The sofa seat cushion 2 is rotatably mounted above the sofa base 1 around a vertical axis;

[0067] The armrest and footrest dual-purpose component 3 is mounted on the side of the sofa seat 2, which can rotate up and down.

[0068] The deformable sofa has the following features:

[0069] Riding status (e.g.) Figure 1 As shown): The sofa seat cushion 2 is rotated relative to the sofa base 1 until the armrest and footrest dual-purpose component 3 is located on the side of the sofa base 1, and the armrest and footrest dual-purpose component 3 is rotated to protrude upward relative to the sofa seat cushion 2 to serve as a sofa armrest;

[0070] Lying down (e.g.) Figure 2 As shown): The sofa seat 2 is rotated relative to the sofa base 1 until the armrest and footrest dual-purpose component 3 is located in front of the sofa base 1, and the armrest and footrest dual-purpose component 3 is rotated to protrude forward relative to the sofa seat 2 to serve as a sofa footrest.

[0071] This utility model's deformable sofa has deformable characteristics, specifically manifested in two usage states: a sitting state and a lying-down state.

[0072] When seated, rotate the sofa seat 2 90° forward so that the armrest and footrest dual-purpose piece 3 is positioned on the side of the sofa base 1. At the same time, rotate the armrest and footrest dual-purpose piece 3 to the upward protruding state, so as to be used as a sofa armrest to provide lateral support.

[0073] When lying down, rotate the sofa seat 2 90° in the opposite direction to move the armrest and footrest dual-use component 3 to the front of the sofa base 1. By rotating the armrest and footrest dual-use component 3, the component 3 protrudes forward to serve as a footrest, extending the seat length to improve lying comfort.

[0074] During operation, the state transition relies on the coordinated action of adjusting the orientation of the sofa seat cushion 2 and the angle of the armrest and footrest dual-purpose component 3. For example, the user can first rotate the sofa seat cushion 2 to change the position of the armrest and footrest dual-purpose component 3, and then operate the armrest and footrest dual-purpose component 3 to switch functions. This design eliminates the need for traditional independent footrest components by reusing a single component, thereby significantly reducing material costs. This not only improves the product's functional integration and space efficiency, but also solves the cost-benefit imbalance caused by adding independent footrest components, making it particularly suitable for multifunctional furniture scenarios with limited living space.

[0075] Therefore, the deformable sofa provided by this utility model can solve the problem that existing sofas require an independent footrest component to realize the footrest function, resulting in high manufacturing costs.

[0076] In this embodiment, a vertical pivot 101, rotatably connected to the sofa base 1, is located at the geometric center of the sofa seat cushion 2; the axis of the vertical pivot 101 is the vertical axis. This centrally symmetrical arrangement ensures that the sofa seat cushion 2 is subjected to uniform force during rotation, avoiding swaying or wear caused by uneven loading. During operation, the vertical pivot 101 acts as a core pivot, guiding the sofa seat cushion 2 to rotate smoothly and forming a stable support with the sofa base 1. In this embodiment, when the deformable sofa is in the sitting state, the armrest and footrest dual-purpose component 3 is in a vertical state, and the top surface of the armrest and footrest dual-purpose component 3 is higher than the top surface of the sofa seat cushion 2. This configuration allows the armrest and footrest dual-purpose component 3 to provide an ergonomically appropriate height when used as an armrest, ensuring a natural and comfortable armrest for the user.

[0077] Furthermore, when the deformable sofa is in the reclining position, the armrest and footrest dual-purpose component 3 can present multiple protruding shapes, including horizontal protrusion, upward protrusion tilting from back to front, or downward protrusion tilting from back to front. These angle options allow users to flexibly adjust according to personal preferences or usage scenarios. For example, horizontal protrusion is suitable for standard footrest support, upward protrusion helps to elevate the legs and promote blood circulation, while downward protrusion is more suitable for a natural and relaxed posture. During operation, the multi-angle adjustment of the armrest and footrest dual-purpose component 3 is achieved through the stroke control of its rotation mechanism, which, in conjunction with the front positioning of the sofa seat cushion 2, ensures the effective extension of the footrest function. This increases the adaptability and comfort of use, meets diverse reclining needs, and further enhances the multi-functional characteristics of the product.

[0078] See Figure 3 In this embodiment, the armrest and footrest dual-purpose component 3 and the sofa seat cushion 2 are connected by a linkage mechanism 4. The linkage mechanism 4, as the transmission core, controls the up-and-down rotation of the armrest and footrest dual-purpose component 3. During operation, the linkage mechanism 4 guides the movement path of the armrest and footrest dual-purpose component 3 to achieve angle adjustment. For example, during state transitions, the linkage mechanism 4 drives the armrest and footrest dual-purpose component 3 to smoothly transition from a vertical state to a horizontal or tilted state through the relative movement of multiple hinge points. This mechanical linkage ensures the synchronization and reliability of the movements, avoiding jamming or misalignment.

[0079] The following describes an optional implementation of the linkage mechanism 4.

[0080] In this embodiment, the linkage mechanism 4 includes:

[0081] A first fixed base plate 401 is fixedly mounted on the sofa seat 2;

[0082] The second fixed base plate 402 is fixedly mounted on the handrail foot pedal dual-purpose component 3;

[0083] First connecting rod 403, one end of the first connecting rod 403 is hinged to the end of the first fixed base plate 401 away from the handrail foot pedal dual-purpose component 3.

[0084] The second connecting rod 404 has one end hinged to the other end of the first connecting rod 403 and the other end hinged to the end of the second fixed base plate 402 near the first fixed base plate 401.

[0085] The third link 405, one end of which is hinged to the end of the first fixed base plate 401 near the handrail foot pedal dual-purpose component 3, and the middle part of the third link 405 is hinged to the middle part of the second link 404.

[0086] The fourth link 406 is hinged at one end to the other end of the third link 405 and at the other end of the second fixed base plate 402 away from the first fixed base plate 401.

[0087] Furthermore, the transformable sofa also includes:

[0088] A direct-drive linkage 6 is rotatably mounted on the sofa seat 2, and the drive end of the direct-drive linkage 6 is hinged to the first linkage 403.

[0089] in,

[0090] When the drive end of the linkage direct drive mechanism 6 retracts away from the armrest and footrest dual-purpose component 3, the linkage mechanism 4 drives the armrest and footrest dual-purpose component 3 to rotate so that it protrudes upward relative to the sofa seat 2.

[0091] When the drive end of the linkage direct drive mechanism 6 extends towards the armrest and footrest dual-purpose component 3, the linkage mechanism 4 drives the armrest and footrest dual-purpose component 3 to rotate so that it protrudes forward relative to the sofa seat 2.

[0092] In this embodiment, the first fixed base plate 401 fixed to the sofa seat 2 and the second fixed base plate 402 fixed to the armrest and footrest dual-purpose component 3 are hinged together by the first connecting rod 403, the second connecting rod 404, the third connecting rod 405, and the fourth connecting rod 406 to form a multi-degree-of-freedom planar linkage system. During operation, when it is necessary to switch from a reclining position to a sitting position, the driving end of the linkage direct drive mechanism 6 retracts away from the armrest and footrest dual-purpose component 3. This action is transmitted to the entire linkage system through the first connecting rod 403, forcing the second fixed base plate 402 to drive the armrest and footrest dual-purpose component 3 to rotate to a vertical position; conversely, when the driving end extends, it drives the armrest and footrest dual-purpose component 3 to rotate to the footrest position. The motion sequence logic of each component is closely coordinated: the direct drive mechanism provides the initial power, the first link 403 acts as the active component to drive the second link 404 to swing, and the third link 405 and the fourth link 406 play a role in constraint and guidance, together transforming the linear drive into a smooth angle change of the handrail and foot pedal dual-use component 3.

[0093] Optionally, in some other embodiments, an annular turntable bearing can be provided between the sofa seat 2 and the sofa base 1 to allow them to rotate around a vertical axis. This eliminates the need to encroach on the internal space of the sofa seat 2, thereby reducing the layout difficulty of the linkage mechanism 4.

[0094] In this embodiment, the deformable sofa also includes a sofa backrest 5, which is rotatably mounted to the rear end of the sofa base 1 via an angle adjuster. The angle adjuster can be a common rotation angle limiting hinge mechanism, a gas spring, or an electric push rod, allowing the user to adjust the tilt angle of the sofa backrest 5 as needed. During operation, the adjustment of the sofa backrest 5 is independent of the rotation of the sofa seat cushions 2 and the deformation of the armrest and footrest dual-purpose components 3. This modular design enhances the comfort and functionality of the sofa, enabling it not only to transform between sitting and reclining positions but also to provide personalized back support adjustment, meeting the diverse rest needs of users.

[0095] In this embodiment, two sofa cushions 2 are arranged side-by-side in front of the sofa backrest 5, and each sofa cushion 2 is equipped with a corresponding armrest and footrest dual-purpose component 3. This transformable sofa can be expanded into an efficient layout for a two-seater sofa. The two sofa cushions 2 arranged side-by-side in front of the sofa backrest 5 form a two-seater sofa unit. Each sofa cushion 2 is independently equipped with an armrest and footrest dual-purpose component 3, allowing two users to independently convert one side of the sofa into a reclining or sitting position without interfering with each other, greatly improving the product's flexibility and practicality.

[0096] Furthermore, both the sofa seat 2 and the sofa backrest 5 include a rigid frame and a soft covering layer covering the outside of the rigid frame;

[0097] When the deformable sofa is in a sitting position, the adjacent soft upholstery layers elastically abut against each other to form a continuous support surface;

[0098] There is a gap between two adjacent rigid frames to allow the corresponding soft cladding layer to pass through after compression.

[0099] To overcome the common industry challenge of "suspended seating" caused by the inevitable gaps between movable parts, this embodiment employs a composite structure of "rigid inside and soft outside": an internal rigid frame providing core support, and an external soft upholstery covering it. The key to this design is the pre-set gap between the rigid frames of adjacent components. During operation, this ingenious structure works in concert: when the sofa is in a stable seating position, adjacent soft upholstery layers (such as between the soft upholstery layers of the sofa seat 2 and sofa back 5, or between the soft upholstery layers of two sofa seat 2s) undergo slight elastic compression deformation, tightly abutting against each other. This creates a continuous, seamless, and complete support surface visually and tactilely, perfectly concealing the underlying structural gap and completely eliminating the gaps and feeling of suspension. When the sofa seat cushion 2 needs to be rotated for functional conversion, the soft upholstery undergoes significant elastic compression deformation to create space, allowing the two adjacent rigid frames to rotate smoothly using the preset interval space, thus avoiding rigid interference between the rigid frame of the sofa seat cushion 2 that needs to be rotated and the rigid frame of the sofa backrest 5 or another sofa seat cushion 2.

[0100] The composite structure and space-space design of the sofa seat cushion 2 creatively resolves the inherent contradiction between "dynamic mechanism" and "static comfort" in multifunctional furniture. It not only ensures absolute reliability of movement functions at the mechanical level through the space-space between the rigid frames, but also achieves seamless comfort in a static state through the elastic deformation of the soft upholstery. This design allows the deformable sofa of this invention to transcend the functional limitations or compromises in comfort of traditional designs, achieving a high degree of unity between functionality, reliability, and comfort.

[0101] In summary, the transformable sofa provided in this embodiment has the following advantages:

[0102] ① By integrating the armrest and footrest dual-function component 3 onto the rotatable sofa seat 2, and making it function as both an armrest and a footrest in two states, two functions are achieved with a single component, significantly reducing material costs.

[0103] ② By using a linkage mechanism 4 to connect the armrest and foot pedal dual-purpose component 3 and the sofa seat 2, and by utilizing its mechanical gain and motion trajectory control, the component can achieve smooth, effortless and reliable rotation in different states.

[0104] ③ By adopting a composite structure of "rigid frame + soft padding" and setting interval spaces between the rigid frames, the elastic deformation of the soft padding fills the gaps when static and allows the frames to avoid each other when dynamic, which perfectly solves the interference problem between moving parts and eliminates the feeling of suspension when riding, thus achieving a unity of mechanical function and riding comfort.

[0105] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A transformable sofa, characterized in that, include: Sofa base (1); The sofa seat cushion (2) is rotatably mounted above the sofa base (1) around a vertical axis; The armrest and footrest dual-purpose component (3) is installed on the side of the sofa seat (2) by rotating up and down; The deformable sofa has the following features: Sitting position: The sofa seat (2) rotates relative to the sofa base (1) until the armrest and footrest dual-purpose piece (3) is located on the side of the sofa base (1), and the armrest and footrest dual-purpose piece (3) rotates to protrude upward relative to the sofa seat (2) to serve as a sofa armrest; Lying down position: The sofa seat (2) rotates relative to the sofa base (1) until the armrest and footrest dual-purpose piece (3) is located in front of the sofa base (1), and the armrest and footrest dual-purpose piece (3) rotates to protrude forward relative to the sofa seat (2) to serve as a sofa footrest.

2. The deformable sofa according to claim 1, characterized in that, The sofa seat (2) is provided with a vertical pivot (101) at the geometric center position, which is rotatably connected to the sofa base (1). The axis of the vertical rotating shaft (101) is the vertical axis.

3. The deformable sofa according to claim 1, characterized in that, When the deformable sofa is in the sitting state, the armrest and footrest dual-purpose component (3) is in a vertical state, and the top surface of the armrest and footrest dual-purpose component (3) is higher than the top surface of the sofa seat (2).

4. The deformable sofa according to claim 1, characterized in that, When the deformable sofa is in the lying position, the armrest and footrest dual-purpose component (3) extends horizontally, tilts upward from back to front, or tilts downward from back to front.

5. The deformable sofa according to claim 3 or 4, characterized in that, The armrest and foot pedal dual-purpose component (3) and the sofa seat (2) are connected by a linkage mechanism (4).

6. The deformable sofa according to claim 5, characterized in that, The linkage mechanism (4) includes: The first fixed base plate (401) is fixed to the sofa seat (2); The second fixed base plate (402) is fixed to the handrail foot pedal dual-purpose component (3); The first connecting rod (403) has one end hinged to the end of the first fixed base plate (401) away from the handrail foot pedal dual-purpose component (3); The second connecting rod (404) has one end hinged to the other end of the first connecting rod (403) and the other end hinged to the end of the second fixed base plate (402) near the first fixed base plate (401). The third link (405) has one end hinged to the end of the first fixed base plate (401) near the handrail foot pedal dual-purpose component (3), and the middle part of the third link (405) is hinged to the middle part of the second link (404). The fourth link (406) is hinged at one end to the other end of the third link (405) and at the other end of the second fixed base plate (402) away from the first fixed base plate (401).

7. The deformable sofa according to claim 6, characterized in that, Also includes: A direct-drive linkage (6) is rotatably mounted on the sofa seat (2), and the drive end of the direct-drive linkage (6) is hinged to the first linkage (403). in, When the drive end of the linkage direct drive mechanism (6) retracts away from the armrest and foot pedal dual-purpose component (3), the linkage mechanism (4) drives the armrest and foot pedal dual-purpose component (3) to rotate so that it protrudes upward relative to the sofa seat (2); When the drive end of the linkage direct drive mechanism (6) extends towards the armrest and foot pedal dual-purpose component (3), the linkage mechanism (4) drives the armrest and foot pedal dual-purpose component (3) to rotate so that it protrudes forward relative to the sofa seat (2).

8. The deformable sofa according to claim 1, characterized in that, Also includes: The sofa backrest (5) is mounted on the rear end of the sofa base (1) by means of an angle adjuster.

9. The deformable sofa according to claim 8, characterized in that, Two sofa cushions (2) are arranged side by side in front of the sofa backrest (5), and each sofa cushion (2) is provided with a corresponding armrest and footrest dual-purpose piece (3).

10. The deformable sofa according to claim 9, characterized in that, Both the sofa seat (2) and the sofa back (5) include a rigid frame and a soft covering layer covering the outside of the rigid frame; When the deformable sofa is in a sitting position, the adjacent soft upholstery layers elastically abut against each other to form a continuous support surface; There is a gap between two adjacent rigid frames to allow the corresponding soft cladding layer to pass through after compression.

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