Massage sofa and driving device thereof

Abstract

The invention discloses a massage sofa and a driving device thereof.The massage sofa comprises a base, a seat frame used for installing a chair seat, a backrest installing frame used for installing a backrest and a leg placing plate installing frame used for installing a leg placing plate, and the seat frame is installed above the base in a front-back movement mode; 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] The invention belongs to the technical field of furniture, and in particular relates to a massage sofa and a driving device thereof. Background Art

[0002] At present, massage sofas on the market need to be placed at a certain distance from the wall so that the backrest will not conflict with the wall when reclining, which greatly increases the space requirements for the use of massage sofas. The zero-wall function of the massage sofa means that the distance between the backrest and the wall is zero when sitting, and the backrest can be directly folded down when lying on your back.

[0003] The zero-gravity function of the massage sofa simulates the body posture of astronauts in a state of weightlessness in space. When the massage sofa turns on the zero-gravity mode, the sofa will automatically adjust to a specific angle, so that the legs of the human body are raised, the body is in a nearly horizontal state, and the back and waist are fully supported. This posture can redistribute the center of gravity of the human body and reduce the pressure on the spine, waist and legs. Because when sitting or standing normally, the gravity of the human body is mainly concentrated on the spine and lower limbs, and maintaining this posture for a long time can easily lead to fatigue and physical discomfort. The zero-gravity state can evenly disperse the gravity of the body and reduce the pressure on various parts of the body, thereby achieving the effect of relaxing the body and relieving fatigue. For people who often sit or stand for a long time, the zero-gravity function can effectively relieve the body's fatigue, reduce leg edema, back pain and other problems. At the same time, it can also promote blood circulation, help the body relax and recover better, and improve the effect and comfort of massage.

[0004] Existing massage sofas generally add massage functions to the backrest without considering the massage effect, which has great limitations. The sofas generally have a large seat depth. When most people sit normally, there is a large distance between the sofa backrest and the human body, making it difficult to achieve sitting massage. Also, because of the large seat depth, the movement range of the backrest and the seat plate is quite different when switching to a lying position. The backrest and the back of the human body move relative to each other, which can easily cause clothing to be pulled and make people feel uncomfortable. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a massage sofa and a driving device thereof, which can realize a wide range of adjustable seat depth by adding a backrest adjustment structure, can adapt to the use of people of different heights and body shapes, can realize seated massage, and can realize zero gravity and zero leaning against the wall functions.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A driving device comprises a base, a seat frame for mounting a chair seat, a backrest mounting frame for mounting a backrest, and a legrest mounting frame for mounting a legrest, wherein the seat frame is mounted above the base in a manner that allows it to move forwards and backwards, the backrest mounting frame is mounted at the rear of the seat frame in a manner that allows it to move forwards and backwards and is driven by a first driving member to move forwards and backwards to adjust the seat depth; the legrest mounting frame is mounted at the front of the seat frame in a manner that allows it to move forwards and backwards and flip over, and the second driving member drives the legrest mounting frame to move forwards and backwards to flip over so that the legrest can move forwards to be lifted or backwards to be stored, while also driving the seat frame to move forwards and backwards and the backrest to tilt.

[0008] Preferably, it also 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 is installed at the rear of the linkage frame in a manner that it can move forward and backward and is driven by the first driving member to move forward and backward to adjust the seat depth.

[0009] Preferably, the seat frame includes seat frame side panels and a seat frame cross bar, and the left and right seat frame side panels are fixedly connected by the seat frame cross bar; the linkage frame includes linkage side panels and a linkage cross bar, and the left and right linkage side panels are fixedly connected by the linkage cross bar; the seat frame side panels and the linkage side panels are hinged.

[0010] Preferably, the backrest mounting frame is connected to the rear portion of the linkage side panel via a first backrest connecting rod and a second backrest connecting rod, one end of the first backrest connecting rod is hinged to the backrest mounting frame, the other end of the first backrest connecting rod is hinged to the linkage side panel, one end of the second backrest connecting rod is hinged to the backrest mounting frame, and the other end of the second backrest connecting rod is hinged to the linkage side panel, so that the backrest mounting frame, the first backrest connecting rod, the second backrest connecting rod and the linkage side panel form a four-bar linkage.

[0011] Preferably, a backrest limiter is installed on the first backrest connecting rod, and the backrest limiter cooperates with the backrest mounting frame to limit the forward and backward movement range of the backrest mounting frame; the left and right second backrest connecting rods are fixedly connected by a first connecting cross bar, and the first driving member is an electric push rod, and the mounting part and the moving part of the first driving member are respectively hinged to the linkage cross bar and the first connecting cross bar.

[0012] Preferably, the leg rest mounting frame is connected to the front portion of the seat frame side panel through the first leg rest link, the second leg rest link, the third leg rest link, and the fourth leg rest link, one end of the first leg rest link is hinged to the leg rest mounting frame, 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 panel, one end of the second leg rest link is hinged to the leg rest mounting frame, 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 panel, the first leg rest link and the third leg rest link are hinged, so that the leg rest mounting frame, 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 panel form a double four-bar linkage.

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

[0014] Preferably, the seat frame is connected to the base through 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, 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 limiter is installed on the first seat frame connecting rod, and the seat frame limiter cooperates with the seat frame side plate to limit the front and rear movable range of the seat frame.

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

[0016] A massage sofa comprises a driving device as described above, wherein a sofa backrest is fixedly mounted on a backrest mounting frame, a massage track and a massage movement are mounted on the sofa backrest; a legrest is fixedly mounted on the legrest mounting frame, and a sofa seat is fixedly mounted on a seat frame.

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

[0018] The present invention adopts the above technical scheme, and realizes a wide range of adjustable seat depth by adding a backrest adjustment structure, can adapt to the use of people of different heights and body shapes, can realize sitting massage, and can realize zero gravity and zero leaning against the wall functions; the backrest is raised during the seat depth adjustment process, which can further increase the neck massage area and improve the massage effect; when the seat depth is minimum, zero gravity and zero leaning against the wall functions can also be achieved, creating a real massage sofa, breaking the limitations of traditional massage sofas, meeting the use of all human bodies, improving the massage effect, and will not cause the phenomenon of pulling clothes, and the user experience is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0020] Figure 1It is a structural schematic diagram of the massage sofa of the present invention (lying position).

[0021] Figure 2 It is a schematic structural diagram of the driving device of the present invention (lying state).

[0022] Figure 3 It is a three-dimensional diagram of the driving device of the present invention (lying state).

[0023] Figure 4 It is a structural schematic diagram of the massage sofa of the present invention (sitting position, large sitting depth).

[0024] Figure 5 It is a schematic diagram of the structure of the driving device of the present invention (sitting position, large sitting depth).

[0025] Figure 6 It is a three-dimensional diagram of the drive device of the present invention (sitting position, large sitting depth).

[0026] Figure 7 It is a structural schematic diagram of the massage sofa of the present invention (sitting state, small sitting depth).

[0027] Figure 8 It is a schematic diagram of the structure of the driving device of the present invention (sitting state, small sitting depth).

[0028] Fig. 9 It is a three-dimensional diagram of the drive device of the present invention (sitting position, small sitting depth).

[0029] Among them, 1. backrest; 11. massage movement; 12. massage track; 13. backrest mounting frame; 14. first backrest connecting rod; 15. backrest limiting member; 16. second backrest connecting rod; 17. first connecting cross bar; 18. first driving member; 2. seat plate; 20. seat frame side plate; 21. seat frame cross bar; 24. first seat frame connecting rod; 25. second seat frame connecting rod; 26. seat frame limiting member; 3. base; 30. linkage side plate; 31. first linkage connecting rod; 32. second linkage connecting rod; 33. linkage cross bar; 40. legrest mounting frame; 41. first legrest connecting rod; 42. second legrest connecting rod; 43. legrest limiting member; 44. third legrest connecting rod; 45. fourth legrest connecting rod; 46. second connecting cross bar; 47. second driving member. DETAILED DESCRIPTION

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

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprises" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Embodiment 1:

[0039] like Figures 1 to 9 A massage sofa and its driving device are shown, the driving device includes a base 3, a seat frame for mounting a seat, a backrest mounting frame 13 for mounting a backrest, and a legrest mounting frame 40 for mounting a legrest, the seat frame is mounted above the base 3 in a manner that allows it to move forward and backward, the backrest mounting frame 13 is mounted on the rear part of the seat frame in a manner that allows it to move forward and backward and is driven by a first driving member 18 to move forward and backward to adjust the seat depth; the legrest mounting frame 40 is mounted on the front part of the seat frame in a manner that allows it to move forward and backward and flip, and the second driving member 47 drives the legrest mounting frame 40 to move forward and backward and flip to achieve the forward movement and lifting or backward movement of the legrest for storage, while also driving the seat frame to move forward and backward and the backrest to tilt.

[0040] like Figure 1 , Figure 4 and Figure 7 The massage sofa shown in the figure comprises a driving device as described above, a sofa backrest 1 is fixedly mounted on a backrest mounting frame 13, a massage track 12 and a massage movement 11 are mounted on the sofa backrest 1; a legrest is fixedly mounted on a legrest mounting frame 40, and a sofa seat is fixedly mounted on a seat frame. The massage track adopts a curved guide rail to enhance the massage effect of key parts of the human body.

[0041] like Figure 2 and Figure 3 As shown, in this embodiment, the driving device also 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 it can move forward and backward and is driven by the first driving member 18 to move forward and backward to adjust the seat depth.

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

[0043] In this embodiment, the backrest mounting frame 13 is preferably connected to the rear of the linkage side plate 30 through the first backrest connecting rod 14 and the 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-bar linkage. In this way, the four-bar linkage is used to drive the backrest to move forward and backward, and the structure is simple and reasonable, and the action is stable and reliable.

[0044] In this embodiment, preferably, a backrest limiter 15 is installed on the first backrest connecting rod 14, and the backrest limiter 15 blocks and cooperates with the backrest mounting frame 13 to limit the forward and backward movement range of the backrest mounting frame 13. In this way, not only the range of motion of the backrest can be limited, but also the four-bar linkage mechanism can be prevented from rotating excessively and being unable to reset. The left and right second backrest connecting rods 16 are fixedly connected by the first connecting cross bar 17, and the first driving member 18 is an electric push rod. The mounting part and the moving part of the first driving member 18 are respectively hinged to the linkage cross bar 33 and the first connecting cross bar 17. In this way, not only can the seat depth be directly driven and adjusted, but also the structure is reasonable, the driving stroke is short and the cost is low.

[0045] In this way, in the sitting state, the sofa backrest is driven to move forward and backward by the first driving member to adjust the sofa sitting depth, so that the massage movement fits the human body better, achieving sitting massage and good massage effect; in the lying state, the sofa backrest is driven to move forward and backward by the first driving member to adjust the sofa lying angle, so that users of different heights and body shapes can enjoy a comfortable posture and zero gravity function, achieving a good massage effect.

[0046] The present embodiment is preferred, the legrest mounting frame 40 is connected to the front of the seat frame side plate 20 through the first legrest link 41, the second legrest link 42, the third legrest link 44, and the fourth legrest link 45, one end of the first legrest link 41 is hinged to the legrest mounting frame 40, the other end of the first legrest link 41 is hinged to one end of the fourth legrest link 45, the other end of the fourth legrest link 45 is hinged to the seat frame side plate 20, the second legrest link 42 is hinged to one end of the fourth legrest link 45 ... One end is hinged to the legrest mounting frame 40, the other end of the second leg rest link 42 is hinged to one end of the third leg rest link 44, the other end of the third leg rest link 44 is hinged to the seat frame side panel 20, the first leg rest link 41 and the third leg rest link 44 are hinged, so that the legrest mounting frame 40, the first leg rest link 41, the second leg rest link 42, the third leg rest link 44, the fourth leg rest link 45 and the seat frame side panel 20 form a double four-bar linkage.

[0047] In this embodiment, the third leg rest link 44 is preferably provided with a leg rest stopper 43, which blocks and cooperates with the first leg rest link 41 to limit the range of motion of the leg rest mounting bracket 40; the left and right third leg rest links 44 are fixedly connected by a second connecting cross bar 46, and the second driving member 47 is an electric push rod, and the mounting portion and the moving portion of the second driving member 47 are respectively hinged to the seat frame cross bar 21 and the second connecting cross bar 46. In this way, the leg rest can be directly driven to be lifted and retracted, and the structure is reasonable, the driving stroke is short, and the cost is low.

[0048] In this embodiment, the seat frame is connected to 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 hinged to the rear of the seat frame side plate 20, 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 limiter 26 is installed on the first seat frame connecting rod 24, and the seat frame limiter 26 cooperates with the seat frame side plate 20 to block and limit the front and rear range of motion of the seat frame.

[0049] In this embodiment, the linkage side panel 30 is preferably connected to the fourth leg rest link 45 through the first linkage link 31, one end of the first linkage link 31 is hinged to the linkage side panel 30, and the other end of the first linkage link 31 is hinged to the fourth leg rest link 45; the linkage side panel 30 is connected to the second seat frame link 25 through the second linkage link 32, one end of the second linkage link 32 is hinged to the linkage side panel 30, and the other end of the second linkage link 32 is hinged to the second seat frame link 25. In this way, the leg rest, the seat frame and the backrest are formed into a linkage mechanism through the linkage side panel, 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 store, it also drives the seat frame to move forward and backward and the backrest to tilt, thereby realizing the conversion of the sitting state and the lying state of the massage sofa, and realizing the zero-wall zero-gravity function.

[0050] In this embodiment, the linkage side plate 30 is preferably located on the inner side of the seat frame side plate 20, the second seat frame link 25 and the first linkage link 31 are respectively located on the inner and outer sides of the seat frame side plate 20, the linkage side plate 30 is first bent outward near the hinged part of the first linkage link 31 and then hinged with the first linkage link 31, the linkage side plate 30 is first bent inward near the fixed position of the linkage cross bar 33 and then fixedly connected with the linkage cross bar 33, and the first leg rest link 41, the third leg rest link 44 and the fourth leg rest link 45 are located between the second seat frame link 25 and the first linkage link 31. In this way, the structure is compact and reasonable, the action is stable and reliable, and the components do not interfere with each other.

[0051] In this embodiment, when the massage sofa is in the initial sitting position, Figures 4 to 6As shown in the figure, the backrest is against the wall and the sofa is deep. For most people, the backrest cannot fit the waist and back well and is not suitable for massage. Figures 7 to 9 As shown in the figure, after the backrest is adjusted, the massage sofa is in a sitting position with a small sitting depth, so that the backrest fits well with the waist and back of the human body, which is suitable for sitting massage. In this way, through the backrest adjustment function, it can adapt to people of different heights and body shapes for sitting massage. When the massage sofa is converted from a sitting position to a lying position, the first driving member first drives the backrest to move forward to the small sitting depth state, and then the second driving member synchronously drives the legrest to lift, the seat plate to move forward and the backrest to tilt backward, as shown in the figure. Figures 1 to 3 As shown, the zero-gravity and zero-wall-leaning function is achieved, and during this movement, the backrest and the human back will not move relative to each other, and the clothes will not be pulled, which provides a better user experience.

[0052] Compared with the traditional massage sofa, the massage sofa of this embodiment has the following advantages:

[0053] 1. Traditional massage sofas only add massage to the backrest, but do not consider the massage effect, which has great limitations. When most people sit normally, there is a large distance between the sofa backrest and the human body, that is, it is not easy to achieve sitting massage. The massage sofa of this embodiment has a large range of adjustable seat depth by adding a backrest adjustment structure, which can adapt to people of different heights and body shapes, and can achieve sitting massage, and can also achieve zero gravity and zero wall leaning functions.

[0054] 2. The backrest is raised during the seat depth adjustment process to further increase the neck massage area and enhance the massage effect.

[0055] 3. When the sitting depth is minimum, zero gravity and zero leaning against the wall can also be achieved.

[0056] 4. The curved guide rail is used to enhance the massage effect on key parts of the human body.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an implementation", "specific implementation", "other implementations", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment, implementation or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above may also be combined in a suitable manner in any one or more embodiments, implementations or examples. The technical solutions recorded in the present invention also include technical solutions formed by any one or more of the specific features, structures, materials or characteristics described above in a separate or combined manner.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A driving device, comprising a base (3), a seat frame for mounting a seat, a backrest mounting frame (13) for mounting a backrest, and a legrest mounting frame (40) for mounting a legrest, characterized in that: The seat frame is mounted above the base (3) in a manner that allows it to move forward and backward; the backrest mounting frame (13) is mounted at the rear of the seat frame in a manner that allows it to move forward and backward and is driven by a first drive member (18) to move forward and backward to adjust the seat depth; the legrest mounting frame (40) is mounted at the front of the seat frame in a manner that allows it to move forward and backward and flip; the second drive member (47) drives the legrest mounting frame (40) to move forward and backward to flip so that the legrest can move forward to be lifted or move backward to be stored, while also driving the seat frame to move forward and backward and the backrest to tilt.

2. A driving device according to claim 1, characterized in that: It also includes a linkage frame, which is hinged to the seat frame and forms a multi-link mechanism through a plurality of connecting rods to achieve linkage. The backrest mounting frame (13) is mounted at the rear of the linkage frame in a manner capable of forward and backward movement and is driven by a first driving member (18) to move forward and backward to adjust the seat depth.

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

4. A driving device according to claim 3, characterized in that: The backrest mounting frame (13) is connected to the rear part 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-bar linkage.

5. A driving device according to claim 4, characterized in that: A backrest limiting member (15) is installed on the first backrest connecting rod (14), and the backrest limiting member (15) blocks and cooperates 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 by a first connecting cross bar (17); the first driving member (18) is an electric push rod; the mounting part and the moving part of the first driving member (18) are respectively hinged to the linkage cross bar (33) and the first connecting cross bar (17).

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

7. A driving device according to claim 6, characterized in that: A leg rest limiting member (43) is installed on the third leg rest connecting rod (44), and the leg rest limiting member (43) cooperates with the first leg rest connecting rod (41) to limit the range of movement of the leg rest board mounting frame (40); the left and right third leg rest connecting rods (44) are fixedly connected by a second connecting cross bar (46); the second driving member (47) is an electric push rod; the mounting part and the moving part of the second driving member (47) are respectively hinged to the seat frame cross bar (21) and the second connecting cross bar (46).

8. A driving device according to claim 3, characterized in that: The seat frame is connected to 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 hinged to the rear of the seat frame side plate (20); 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); 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) are blocked and matched to limit the front and rear range of movement of the seat frame.

9. A driving device according to claim 8, characterized in that: 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 of the first linkage link (31) 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 of the second linkage link (32) is hinged to the second seat frame link (25).

10. A massage sofa, characterized in that: It comprises a driving device as described in any one of claims 1 to 9, the sofa backrest (1) is fixedly mounted on the backrest mounting frame (13), and a massage track (12) and a massage movement (11) are installed on the sofa backrest (1); the legrest (4) is fixedly mounted on the legrest mounting frame (40), and the sofa seat (2) is fixedly mounted on the seat frame.

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