Massage sofa and driving device thereof

Abstract

The utility model discloses a massage sofa and a driving device thereof, the massage sofa comprises a base, a seat frame used for mounting a chair seat, a backrest mounting rack used for mounting a backrest and a leg rest mounting rack used for mounting a leg rest, the seat frame is mounted above the base in a manner of moving back and forth; the backrest mounting frame is mounted at the rear part of the seat frame in a manner of moving back and forth and is driven by a first driving piece to move back and forth so as to adjust the sitting depth; the leg placing plate mounting frame is mounted at the front part of the seat frame in a front-and-back movement overturning manner, and the second driving piece drives the leg placing plate mounting frame to move forwards to lift or move backwards to store the leg placing plate, and also drives the seat frame to move forwards and backwards and the backrest to make tilting movement. According to the scheme, the backrest adjusting structure is additionally arranged, so that the sitting depth can be adjusted in a large range, the chair can be suitable for people with different heights and body types, sitting posture massage can be achieved, and the zero-gravity and zero-wall-leaning functions can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of furniture technology, and in particular relates to a massage sofa and its driving device. Background Technology

[0002] Currently, massage sofas on the market require a certain distance when placed against a wall to prevent the backrest from hitting the wall when reclining, which significantly increases the space requirements for their use. A massage sofa with zero wall contact means that the distance between the backrest and the wall is zero when seated, and the backrest can be reclined directly when lying down.

[0003] The zero-gravity function of the massage sofa simulates the body posture of an astronaut in weightlessness in space. When the zero-gravity mode is activated, the sofa automatically adjusts to a specific angle, raising the legs and placing the body in a near-horizontal position while providing ample support for the back and waist. This posture redistributes the body's center of gravity, reducing pressure on the spine, waist, and legs. In a normal sitting or standing posture, the body's weight is primarily concentrated in the spine and lower limbs, and maintaining this posture for extended periods can easily lead to fatigue and discomfort. Zero gravity distributes the body's weight evenly, reducing pressure on various parts of the body, thus achieving relaxation and fatigue relief. For those who frequently sit or stand for long periods, the zero-gravity function can effectively relieve fatigue and alleviate leg swelling, lower back pain, and other problems. It also promotes blood circulation, helping the body relax and recover better, enhancing the massage's effectiveness and comfort.

[0004] Current massage sofas generally only add massage functions to the backrest without considering the massage effect, which has significant limitations. These sofas typically have a large seat depth, meaning that when most people are in a normal sitting position, there is a considerable distance between the sofa backrest and the body, making it difficult to achieve a seated massage. Similarly, because of the large seat depth, the difference in movement between the backrest and seat when transitioning to a reclining position is significant. This relative movement between the backrest and the back can easily cause clothing to be pulled, resulting in discomfort. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a massage sofa and its driving device. By adding a backrest adjustment structure, a wide range of seat depth can be adjusted to accommodate people of different heights and body types. It can realize seated massage and can achieve zero gravity and zero wall-adhesion functions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A driving device includes a base, a seat frame for mounting a chair seat, a backrest mounting bracket for mounting a backrest, and a leg rest mounting bracket for mounting a leg rest. The seat frame is mounted on the base in a manner that allows it to move back and forth. The backrest mounting bracket is mounted at the rear of the seat frame in a manner that allows it to move back and forth and is driven to move back and forth by a first driving member to adjust the seat depth. The leg rest mounting bracket is mounted at the front of the seat frame in a manner that allows it to flip back and forth. A second driving member, while driving the leg rest mounting bracket to flip back and forth to lift the leg rest forward or retract it backward, also drives the seat frame to move back and forth and the backrest to tilt.

[0008] Preferably, the system also includes a linkage frame, which is hinged to the seat frame and forms a multi-link mechanism through multiple links to achieve linkage. The backrest mounting frame is installed at the rear of the linkage frame in a manner that allows it to move back and forth and is driven to move back and forth by a first driving member to adjust the seat depth.

[0009] Preferably, the seat frame includes seat frame side plates and seat frame crossbars, with the left and right seat frame side plates fixedly connected by the seat frame crossbars; the linkage frame includes linkage side plates and linkage crossbars, with the left and right linkage side plates fixedly connected by the linkage crossbars; the seat frame side plates and linkage side plates are hinged.

[0010] Preferably, the backrest mounting frame is connected to the rear of the linkage side plate via a first backrest link and a second backrest link. One end of the first backrest link is hinged to the backrest mounting frame, and the other end of the first backrest link is hinged to the linkage side plate. One end of the second backrest link is hinged to the backrest mounting frame, and the other end of the second backrest link is hinged to the linkage side plate, thereby forming a four-bar linkage mechanism with the backrest mounting frame, the first backrest link, the second backrest link, and the linkage side plate.

[0011] Preferably, a backrest limiting component is installed on the first backrest link, which cooperates with the backrest mounting bracket to restrict the backrest mounting bracket's forward and backward movement range; the two left and right second backrest links are fixedly connected by a first connecting crossbar, and the first driving component is an electric push rod, with the mounting part and the moving part of the first driving component hinged to the linkage crossbar and the first connecting crossbar, respectively.

[0012] Preferably, the leg rest mounting bracket is connected to the front of the seat frame side plate via a first leg rest link, a second leg rest link, a third leg rest link, and a fourth leg rest link. One end of the first leg rest link is hinged to the leg rest mounting bracket, and the other end of the first leg rest link is hinged to one end of the fourth leg rest link. The other end of the fourth leg rest link is hinged to the seat frame side plate. One end of the second leg rest link is hinged to the leg rest mounting bracket, and the other end of the second leg rest link is hinged to one end of the third leg rest link. The other end of the third leg rest link is hinged to the seat frame side plate. The first leg rest link and the third leg rest link are hinged together, thereby forming a double four-bar linkage mechanism with the leg rest mounting bracket, the first leg rest link, the second leg rest link, the third leg rest link, the fourth leg rest link, and the seat frame side plate.

[0013] Preferably, a leg rest limiting member is installed on the third leg rest link, which cooperates with the first leg rest link to restrict the range of motion of the leg rest mounting bracket; the left and right third leg rest links are fixedly connected by a second connecting crossbar, and the second driving member is an electric push rod, with the mounting part and the moving part of the second driving member hinged to the seat frame crossbar and the second connecting crossbar, respectively.

[0014] Preferably, the seat frame is connected to the base via a first seat frame connecting rod and a second seat frame connecting rod. The upper end of the first seat frame connecting rod is hinged to the rear of the seat frame side plate, and the lower end of the first seat frame connecting rod is hinged to the rear of the base. The upper end of the second seat frame connecting rod is hinged to the front of the seat frame side plate, and the lower end of the second seat frame connecting rod is hinged to the front of the base. A seat frame limiting component is installed on the first seat frame connecting rod, and the seat frame limiting component cooperates with the seat frame side plate to restrict the front and rear movement range of the seat frame.

[0015] Preferably, the linkage side plate is connected to the fourth leg support link via a first linkage link, one end of the first linkage link is hinged to the linkage side plate, and the other end of the first linkage link is hinged to the fourth leg support link; the linkage side plate is connected to the second seat frame link via a second linkage link, one end of the second linkage link is hinged to the linkage side plate, and the other end of the second linkage link is hinged to the second seat frame link.

[0016] A massage sofa includes a drive device as described above, a sofa backrest fixedly mounted on a backrest mounting frame, a massage track and a massage mechanism mounted on the sofa backrest; a leg rest fixedly mounted on a leg rest mounting frame, and a sofa seat fixedly mounted on a seat frame.

[0017] Preferably, the massage track uses a curved guide rail to enhance the massage effect on key parts of the human body.

[0018] This utility model, by adopting the above technical solution and adding a backrest adjustment structure, achieves a wide range of adjustable seat depth, adapting to people of different heights and body types. It enables seated massage and provides zero-gravity and zero-wall-adhesion functions. During seat depth adjustment, the backrest is raised slightly, further increasing the neck massage area and enhancing the massage effect. Even at the lowest seat depth, zero-gravity and zero-wall-adhesion functions are still achieved, creating a true massage sofa that breaks through the limitations of traditional massage sofas, meets the needs of all body types, improves the massage effect, and avoids pulling on clothing, resulting in a better user experience. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1This is a schematic diagram of the structure of the massage sofa of this utility model (in a reclining position).

[0021] Figure 2 This is a schematic diagram of the drive device of this utility model (in a lying position).

[0022] Figure 3 This is a perspective view (lying down) of the drive device of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the massage sofa of this utility model (sitting posture, large seat depth).

[0024] Figure 5 This is a schematic diagram of the drive device of this utility model (seated position, large seat depth).

[0025] Figure 6 This is a perspective view of the drive device of this utility model (seated position, large seat depth).

[0026] Figure 7 This is a structural schematic diagram of the massage sofa of this utility model (sitting posture, shallow sitting depth).

[0027] Figure 8 This is a schematic diagram of the drive device of this utility model (sitting posture, small seat depth).

[0028] Figure 9 This is a perspective view of the drive device of this utility model (sitting posture, shallow sitting depth).

[0029] The components include: 1. Backrest; 11. Massage mechanism; 12. Massage track; 13. Backrest mounting bracket; 14. First backrest connecting rod; 15. Backrest limiting component; 16. Second backrest connecting rod; 17. First connecting crossbar; 18. First driving component; 2. Seat plate; 20. Seat frame side plate; 21. Seat frame crossbar; 24. First seat frame connecting rod; 25. Second seat frame connecting rod; 26. Seat frame limiting component; 3. Base; 30. Linkage side plate; 31. First linkage connecting rod; 32. Second linkage connecting rod; 33. Linkage crossbar; 40. Leg rest mounting bracket; 41. First leg rest connecting rod; 42. Second leg rest connecting rod; 43. Leg rest limiting component; 44. Third leg rest connecting rod; 45. Fourth leg rest connecting rod; 46. Second connecting crossbar; 47. Second driving component. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Example 1:

[0039] like Figures 1 to 9 The massage sofa and its driving device are shown. The driving device includes a base 3, a seat frame for mounting the seat, a backrest mounting bracket 13 for mounting the backrest, and a leg rest mounting bracket 40 for mounting the leg rest. The seat frame is mounted on the base 3 in a way that allows it to move back and forth. The backrest mounting bracket 13 is mounted on the rear of the seat frame in a way that allows it to move back and forth and is driven to move back and forth by a first driving member 18 to adjust the seat depth. The leg rest mounting bracket 40 is mounted on the front of the seat frame in a way that allows it to move back and forth and flip. The second driving member 47 drives the leg rest mounting bracket 40 to move back and forth and flip, so that the leg rest moves forward to lift or moves backward to retract. At the same time, it also drives the seat frame to move back and forth and the backrest to tilt.

[0040] like Figure 1 , Figure 4 and Figure 7 The massage sofa shown includes a drive device as described above. The sofa backrest 1 is fixedly mounted on the backrest mounting bracket 13, and a massage track 12 and a massage mechanism 11 are mounted on the sofa backrest 1. The leg rest is fixedly mounted on the leg rest mounting bracket 40, and the sofa seat is fixedly mounted on the seat frame. The massage track adopts a curved guide rail to enhance the massage effect on key parts of the human body.

[0041] like Figure 2 and Figure 3 As shown in the preferred embodiment, the driving device further includes a linkage frame, which is hinged to the seat frame and forms a multi-link mechanism through multiple connecting rods to achieve linkage. The backrest mounting frame 13 is installed at the rear of the linkage frame in a manner that allows it to move back and forth and is driven to move back and forth by the first driving member 18 to adjust the seat depth.

[0042] In this embodiment, the seat frame includes a seat frame side plate 20 and a seat frame crossbar 21, and the left and right seat frame side plates 20 are fixedly connected by the seat frame crossbar 21; the linkage frame includes a linkage side plate 30 and a linkage crossbar 33, and the left and right linkage side plates 30 are fixedly connected by the linkage crossbar 33; the middle part of the seat frame side plate 20 and the middle part of the linkage side plate 30 are hinged.

[0043] In this preferred embodiment, the backrest mounting frame 13 is connected to the rear of the linkage side plate 30 via a first backrest connecting rod 14 and a second backrest connecting rod 16. One end of the first backrest connecting rod 14 is hinged to the backrest mounting frame 13, and the other end is hinged to the linkage side plate 30. One end of the second backrest connecting rod 16 is hinged to the backrest mounting frame 13, and the other end is hinged to the linkage side plate 30. Thus, the backrest mounting frame 13, the first backrest connecting rod 14, the second backrest connecting rod 16, and the linkage side plate 30 form a four-bar linkage mechanism. This four-bar linkage mechanism drives the backrest to move back and forth, resulting in a simple, reasonable structure and stable, reliable operation.

[0044] In this preferred embodiment, a backrest limiting member 15 is installed on the first backrest link 14. The backrest limiting member 15 cooperates with the backrest mounting bracket 13 to restrict the forward and backward movement range of the backrest mounting bracket 13. This not only limits the range of motion of the backrest but also prevents the four-bar linkage from over-rotating and failing to return to its original position. The two left and right second backrest links 16 are fixedly connected by a first connecting crossbar 17. The first driving member 18 is an electric push rod, and the mounting part and the moving part of the first driving member 18 are hinged to the linkage crossbar 33 and the first connecting crossbar 17, respectively. This not only allows for direct driving adjustment of the seat depth but also has a reasonable structure, short driving stroke, and low cost.

[0045] In this way, when in a seated position, the first drive unit moves the sofa back back forward and backward to adjust the seat depth, making the massage mechanism fit the human body more closely and achieving seated massage and a good massage effect; when in a reclining position, the first drive unit moves the sofa back back forward and backward to adjust the reclining angle of the sofa, so that users of different heights and body types can enjoy a comfortable posture and zero-gravity function, achieving a good massage effect.

[0046] In this preferred embodiment, the leg rest mounting bracket 40 is connected to the front of the seat frame side plate 20 via a first leg rest connecting rod 41, a second leg rest connecting rod 42, a third leg rest connecting rod 44, and a fourth leg rest connecting rod 45. One end of the first leg rest connecting rod 41 is hinged to the leg rest mounting bracket 40, and the other end of the first leg rest connecting rod 41 is hinged to one end of the fourth leg rest connecting rod 45. The other end of the fourth leg rest connecting rod 45 is hinged to the seat frame side plate 20. The second leg rest connecting rod 42... One end of the first leg rest rod 41 is hinged to the leg rest mounting bracket 40, the other end of the second leg rest connecting rod 42 is hinged to one end of the third leg rest connecting rod 44, and the other end of the third leg rest connecting rod 44 is hinged to the seat frame side plate 20. The first leg rest connecting rod 41 and the third leg rest connecting rod 44 are hinged together, thereby forming a double four-bar linkage mechanism with the leg rest mounting bracket 40, the first leg rest connecting rod 41, the second leg rest connecting rod 42, the third leg rest connecting rod 44, the fourth leg rest connecting rod 45 and the seat frame side plate 20.

[0047] In this preferred embodiment, a leg-rest limiting member 43 is installed on the third leg-rest connecting rod 44. The leg-rest limiting member 43 cooperates with the first leg-rest connecting rod 41 to restrict the range of motion of the leg-rest mounting bracket 40. The left and right third leg-rest connecting rods 44 are fixedly connected by a second connecting crossbar 46. The second driving member 47 is an electric push rod, and the mounting part and the moving part of the second driving member 47 are respectively hinged to the seat frame crossbar 21 and the second connecting crossbar 46. This not only allows direct driving of the leg-rest to lift and retract, but also has a reasonable structure, short driving stroke, and low cost.

[0048] In this embodiment, the seat frame is connected to the base 3 via a first seat frame connecting rod 24 and a second seat frame connecting rod 25. The upper end of the first seat frame connecting rod 24 is hinged to the rear of the seat frame side plate 20, and the lower end of the first seat frame connecting rod 24 is hinged to the rear of the base 3. The upper end of the second seat frame connecting rod 25 is hinged to the front of the seat frame side plate 20, and the lower end of the second seat frame connecting rod 25 is hinged to the front of the base 3. A seat frame limiting member 26 is installed on the first seat frame connecting rod 24. The seat frame limiting member 26 and the seat frame side plate 20 cooperate to block and restrict the front and rear movement range of the seat frame.

[0049] In this preferred embodiment, the linkage side plate 30 is connected to the fourth leg rest link 45 via a first linkage link 31. One end of the first linkage link 31 is hinged to the linkage side plate 30, and the other end is hinged to the fourth leg rest link 45. The linkage side plate 30 is connected to the second seat frame link 25 via a second linkage link 32. One end of the second linkage link 32 is hinged to the linkage side plate 30, and the other end is hinged to the second seat frame link 25. In this way, the leg rest, seat frame, and backrest are connected to form a linkage mechanism through the linkage side plate, the first linkage link, and the second linkage link. While the second driving member drives the leg rest to move forward to lift or move backward to retract, it also drives the seat frame to move back and forth and the backrest to tilt, thereby realizing the conversion between the sitting and reclining positions of the massage sofa and achieving the zero-wall-adhesion and zero-gravity function.

[0050] In this preferred embodiment, the linkage side plate 30 is located inside the seat frame side plate 20. The second seat frame connecting rod 25 and the first linkage connecting rod 31 are located on the inner and outer sides of the seat frame side plate 20, respectively. The linkage side plate 30 is bent outwards near the hinge point of the first linkage connecting rod 31 before being hinged to the first linkage connecting rod 31. The linkage side plate 30 is bent inwards near the fixed position of the linkage crossbar 33 before being fixedly connected to the linkage crossbar 33. The first leg rest connecting rod 41, the third leg rest connecting rod 44, and the fourth leg rest connecting rod 45 are located between the second seat frame connecting rod 25 and the first linkage connecting rod 31. This structure is compact and reasonable, the operation is stable and reliable, and the components do not interfere with each other.

[0051] In this embodiment, when the massage sofa is in its initial seated position, such as Figures 4 to 6As shown, with the backrest against the wall and the sofa deep and wide, the backrest cannot conform well to the lower back for most people, making it unsuitable for massage. Figures 7 to 9 As shown, after adjusting the backrest, the massage sofa is in a shallow sitting position, allowing the backrest to fit well against the lower back, making it suitable for seated massage. The backrest's forward and backward adjustment function allows it to accommodate people of different heights and body types. When transitioning from a sitting to a reclining position, the first drive mechanism moves the backrest forward to the shallow sitting depth, and then the second drive mechanism simultaneously lifts the leg rest, moves the seat forward, and tilts the backrest backward. Figures 1 to 3 As shown, this achieves zero gravity and zero wall-leaning function. Furthermore, during this movement, the backrest and the user's back will not move relative to each other, preventing clothing from being pulled, resulting in a better user experience.

[0052] Compared to traditional massage sofas, the massage sofa in this embodiment has the following advantages:

[0053] 1. Traditional massage sofas only add massage to the backrest without considering the massage effect, which has significant limitations. When most people are in a normal sitting position, there is a large distance between the sofa backrest and the body, making it difficult to easily achieve a seated massage. This embodiment of the massage sofa adds a backrest adjustment structure, allowing for a wide range of seat depth adjustment to accommodate people of different heights and body types. It also enables seated massage and provides zero-gravity, zero-wall-adhesion functionality.

[0054] 2. During the seat depth adjustment, the backrest is raised slightly to further increase the neck massage area and enhance the massage effect.

[0055] 3. Even in the minimum seat depth state, it can achieve zero gravity and zero wall-leaning function.

[0056] 4. Curved guide rails are used to enhance the massage effect on key parts of the body.

[0057] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this utility model also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A drive device comprising a base (3), a seat frame for mounting a seat, a backrest mounting frame (13) for mounting a backrest, and a leg-rest mounting frame (40) for mounting a leg-rest, characterized in that, The seat frame is installed above the base (3) in a front-back movable manner, the backrest mounting frame (13) is installed at the rear of the seat frame in a front-back movable manner and is driven by the first driving member (18) to move forward and backward to adjust the seat depth; the leg rest plate mounting frame (40) is installed at the front of the seat frame in a front-back movable and overturning manner, and the second driving member (47) drives the leg rest plate mounting frame (40) to move forward and backward to overturn, so as to realize the forward movement and lifting or the backward movement and storage of the leg rest plate, and also drive the seat frame to move forward and backward and the backrest to tilt.

2. A drive device according to claim 1, characterized in that The linkage frame is hinged to the seat frame and forms a multi-link mechanism through a plurality of connecting rods to realize linkage, and the backrest mounting frame (13) is installed at the rear of the linkage frame in a front-back movable manner and is driven by the first driving member (18) to move forward and backward to adjust the seat depth.

3. A drive device according to claim 2, characterized in that The seat frame includes seat frame side plates (20) and a seat frame cross bar (21), and the left and right seat frame side plates (20) are fixedly connected through the seat frame cross bar (21); the linkage frame includes linkage side plates (30) and a linkage cross bar (33), and the left and right linkage side plates (30) are fixedly connected through the linkage cross bar (33); and the seat frame side plates (20) and the linkage side plates (30) are hinged.

4. A drive device according to claim 3, characterized in that The backrest mounting frame (13) is connected to the rear of the linkage side plate (30) through a first backrest connecting rod (14) and a second backrest connecting rod (16), one end of the first backrest connecting rod (14) is hinged to the backrest mounting frame (13), the other end of the first backrest connecting rod (14) is hinged to the linkage side plate (30), one end of the second backrest connecting rod (16) is hinged to the backrest mounting frame (13), and the other end of the second backrest connecting rod (16) is hinged to the linkage side plate (30), so that the backrest mounting frame (13), the first backrest connecting rod (14), the second backrest connecting rod (16) and the linkage side plate (30) form a four-link mechanism.

5. A drive device according to claim 4, characterized in that The first backrest connecting rod (14) is provided with a backrest limiting member (15), the backrest limiting member (15) is in blocking cooperation with the backrest mounting frame (13) to limit the forward and backward movement range of the backrest mounting frame (13); the left and right second backrest connecting rods (16) are fixedly connected through a first connecting cross bar (17), the first driving member (18) is an electric push rod, and the mounting part and the moving part of the first driving member (18) are hinged to the linkage cross bar (33) and the first connecting cross bar (17), respectively.

6. A drive device according to claim 3, characterized in that The leg rest plate mounting frame (40) is connected with the seat frame side plate (20) through a first leg rest connecting rod (41), a second leg rest connecting rod (42), a third leg rest connecting rod (44) and a fourth leg rest connecting rod (45). One end of the first leg rest connecting rod (41) is hingedly connected with the leg rest plate mounting frame (40), the other end of the first leg rest connecting rod (41) is hingedly connected with one end of the fourth leg rest connecting rod (45), the other end of the fourth leg rest connecting rod (45) is hingedly connected with the seat frame side plate (20), one end of the second leg rest connecting rod (42) is hingedly connected with the leg rest plate mounting frame (40), the other end of the second leg rest connecting rod (42) is hingedly connected with one end of the third leg rest connecting rod (44), the other end of the third leg rest connecting rod (44) is hingedly connected with the seat frame side plate (20), the first leg rest connecting rod (41) and the third leg rest connecting rod (44) are hingedly connected, so that the leg rest plate mounting frame (40), the first leg rest connecting rod (41), the second leg rest connecting rod (42), the third leg rest connecting rod (44), the fourth leg rest connecting rod (45) and the seat frame side plate (20) form a double four-bar linkage mechanism.

7. A drive device according to claim 6, characterized in that The third leg rest connecting rod (44) is provided with a leg rest limiting piece (43), the leg rest limiting piece (43) is in blocking cooperation with the first leg rest connecting rod (41), so as to limit the movement range of the leg rest plate mounting frame (40); the left and right two third leg rest connecting rods (44) are fixedly connected through a second connecting cross rod (46), the second driving piece (47) is an electric push rod, the mounting part and the moving part of the second driving piece (47) are hingedly connected with the seat frame cross rod (21) and the second connecting cross rod (46) respectively.

8. The drive apparatus according to claim 3, wherein The seat frame is connected with the base (3) through a first seat frame connecting rod (24) and a second seat frame connecting rod (25), the upper end of the first seat frame connecting rod (24) is hingedly connected with the rear part of the seat frame side plate (20), the lower end of the first seat frame connecting rod (24) is hingedly connected with the rear part of the base (3), the upper end of the second seat frame connecting rod (25) is hingedly connected with the front part of the seat frame side plate (20), the lower end of the second seat frame connecting rod (25) is hingedly connected with the front part of the base (3); the first seat frame connecting rod (24) is provided with a seat frame limiting piece (26), the seat frame limiting piece (26) is in blocking cooperation with the seat frame side plate (20), so as to limit the front and rear movement range of the seat frame.

9. A drive arrangement according to claim 8, wherein, The linkage side plate (30) is connected with the fourth leg rest connecting rod (45) through a first linkage connecting rod (31), one end of the first linkage connecting rod (31) is hingedly connected with the linkage side plate (30), the other end of the first linkage connecting rod (31) is hingedly connected with the fourth leg rest connecting rod (45); the linkage side plate (30) is connected with the second seat frame connecting rod (25) through a second linkage connecting rod (32), one end of the second linkage connecting rod (32) is hingedly connected with the linkage side plate (30), the other end of the second linkage connecting rod (32) is hingedly connected with the second seat frame connecting rod (25).

10. A massage sofa, characterized by The driving device comprises a driving device as claimed in any one of claims 1 to 9, a sofa backrest (1) is fixedly installed on the backrest mounting frame (13), the sofa backrest (1) is provided with a massage track (12) and a massage core (11); a leg rest plate (4) is fixedly installed on the leg rest plate mounting frame (40), and a sofa seat plate (2) is fixedly installed on the seat frame.

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