Movable frame suitable for seat and seat

Abstract

The invention discloses a movable frame suitable for a seat and the seat. The invention relates to the field of household article machinery, in particular to structural design of a seat frame. According to the technical scheme, the movable frame suitable for the seat comprises a main frame, a seat frame, a back frame, a leg frame and a driving device, the driving device comprises a base connected to the main frame and a push rod connected with the base, the movable frame further comprises a middle movable frame, a straight groove and a rising groove are formed in the main frame, and the middle movable frame is connected with the straight groove. The grooving direction of the upward raising groove is upward raising along the push-out direction of the push rod, and the push rod is connected with the middle moving frame and pushes the middle moving frame to slide along the straight groove; the invention aims at providing the movable frame suitable for the seat and the seat, the universality is high, and the movable frame and the seat can be suitable for sofa chairs, massage chairs and automobile seats and also can be suitable for seat products with small sizes such as electronic sports chairs and ergonomic chairs; and more reasonable transmission sequence logic is adopted in the whole activity process, so that the user comfort in the frame activity process is improved.

Description

Technical Field

[0001] The invention relates to the field of household goods machinery, and in particular to the structural design of a seat frame. Background Art

[0002] With the progress of the times and the improvement of living standards, in addition to the traditional support functions, the comfort and wrapping of seats are receiving more and more attention. Mid-to-high-end products such as massage sofas, single sofa chairs, gaming chairs, ergonomic chairs, etc. are gradually becoming mainstream products in the market.

[0003] In these products, in order to allow all parts of the user's body to be effectively supported, the support area is often enlarged. For example, the Chinese patent document with the announcement number CN202323163483.0 discloses a sofa, which has an increased support area, including three main support frames: hip support, leg support, and back support. In order to further improve comfort, the function of movable support components is added. For example, the Chinese patent document with the announcement number CN113509022A discloses a functional sofa chair, whose three major support parts, namely the seat cushion, lumbar support, and leg support, are respectively equipped with electric push rods and tracks, so that these three support parts can slide along the track, providing users with a more personalized and flexible support state.

[0004] Although this gives users a more comfortable experience, there are two technical flaws: First of all, most products on the market are independent sports types. That is, the seat cushion, lumbar support, and leg support require three sets of tracks, three sets of oil cylinders, pneumatic cylinders, or electric steels to drive them separately. This not only increases production costs, but also increases the size. Three sets of drive devices require a lot of layout space, which makes the entire sofa chair bloated, and it is difficult for products with a relatively thin volume such as gaming chairs and single ergonomic chairs to be used.

[0005] Secondly, even if a joint motion design is made to reduce costs, that is, a set of driving devices is used to drive the three components, the driving order of the three components is often the leg rest, the seat cushion, and the lumbar support. That is, the leg rest moves first, then the seat cushion, and finally the lumbar support. This affects the comfort during the adjustment process. For example, when the leg rest has moved to an almost horizontal position, the lumbar support and the seat cushion still maintain an upright sitting posture, that is, an almost vertical state. At this time, this posture is not comfortable for the human body. Summary of the invention

[0006] The purpose of the present invention is to provide a movable frame and seat suitable for seats, which have strong versatility and are not only suitable for sofa chairs, massage chairs, and car seats, but also can adapt to small-sized seat products such as e-sports chairs and ergonomic chairs; and the entire activity process adopts a more reasonable transmission sequence logic to improve user comfort during the frame activity process.

[0007] The present invention is realized by the following technical scheme: a movable frame suitable for a chair, comprising a main frame, a seat frame, a back frame and a leg support, and also comprising a driving device, wherein the driving device comprises a base connected to the main frame and a push rod connected to the base, and further comprising a middle moving frame, wherein a straight groove and an upward groove are provided on the main frame, wherein the groove direction of the upward groove is upward along the pushing direction of the push rod, and the push rod is connected to the middle moving frame to push the middle moving frame to slide along the straight groove; The middle moving frame comprises a middle slide plate, a slide groove provided on the middle slide plate, and a push plate connected to the middle slide plate; It also comprises a swing frame 1, wherein the swing frame 1 is slidably connected to the upward groove through a connecting frame shaft; The slide groove comprises a smooth groove and a vertical groove extending in the vertical direction and penetrating the smooth groove, and a push edge for pushing the connecting shaft forward is provided in the vertical groove; The swing frame 1 is connected to the seat frame and the back frame; The leg bracket is connected to a second swing frame, and the push plate is used to contact with the second swing frame to push the leg bracket to move.

[0008] As a preferred embodiment of the present invention, the middle moving frame includes a connecting rod plate for connecting to the push rod, and there are two middle sliding plates, which are respectively connected to both sides of the connecting rod plate.

[0009] As a preferred embodiment of the present invention, there are more than two straight grooves arranged in different height directions.

[0010] As a preferred embodiment of the present invention, the main frame further includes two side frames, a transverse connecting frame connecting the two side frames, and a fixed frame connected to the middle of the transverse connecting frame, and the straight trough and the upward trough are both opened on the fixed frame.

[0011] As a preferred embodiment of the present invention, a guide groove is provided on the side frame, and the seat frame slides along the guide groove via a guide wheel.

[0012] As a preferred embodiment of the present invention, each side frame is provided with two or more guide grooves, and the arrangement direction is the pushing direction of the push rod.

[0013] As a preferred embodiment of the present invention, the swing frame is connected to a pull plate, the pull plate is connected to the back frame, the back frame is connected to the seat frame, and the back frame rotates relative to the seat frame under the drive of the pull plate.

[0014] As a preferred embodiment of the present invention, the seat frame is hinged with an intermediate plate, one end of the intermediate plate is connected to the pull plate, and the other end is connected to a connecting rod, and the connecting rod is connected to the fixed frame.

[0015] As a preferred embodiment of the present invention, the second swing frame includes a contact wheel, and the contact wheel contacts the push plate.

[0016] The seat comprises the movable frame suitable for the seat, and also comprises a seat stool, a lumbar support and a leg support, wherein the seat stool is mounted on the seat frame, the lumbar support is mounted on the back frame, and the leg support is mounted on the leg support.

[0017] In summary, the present invention has the following beneficial effects: 1. The movement logic of the entire movable frame is to first sit on the frame and move forward, then turn the back on the back frame. At this time, the leg bracket does not move, and the human body will not be in an uncomfortable posture with legs raised high and back straight. When it reaches state 2, that is, after the set backward posture, the legs will slowly move up to improve comfort.

[0018] 2. In the process of transitioning from state one to state two, the back frame flipping backward and the seat frame moving forward are completed synchronously with good synchronization.

[0019] 3. The entire process uses only one drive device, which requires less space and makes costs more controllable.

[0020] 4. The rearward folding of the back frame and the forward movement of the seat frame both rely on the same transmission component, the swing frame, which further improves the synchronization of the two movements and also reduces the occupancy pressure of the horizontal space inside the seat.

[0021] 5. In state 2, the separation of the transmission device does not rely on precise electronic components for electronic switching, but relies on the upward design of the upward groove to separate the power. This design makes the entire seat less susceptible to interference and failure of electronic components, and the power transmission and power separation are more stable and reliable.

[0022] 6. The guide grooves on the side frames make the movement of the entire seat frame more stable.

[0023] 7. In normal state, the leg slide is retracted, the leg support is lowered and stored under the seat frame 2, and does not take up space.

[0024] 8. When leg support is needed, the leg bracket is swung up and the leg slide frame slides forward, which effectively extends the distance of the support area and is suitable for foot support for users with higher height and longer legs.

[0025] 9. During the whole process, the real power comes from only one set of drive devices, without the need for multiple sets of drives, further reducing the pressure of space placement.

[0026] 10. The connection between the ball joint plate and the seat frame relies on the ball head bearing, which allows the ball joint plate to move in multiple directions relative to the seat frame.

[0027] 11. Due to the existence of the intermediate component, the sliding plate, the forward sliding action of the foot slide and the forward swinging action of the leg base have good consistency and synchronization, and the movement of the entire leg support is smoother and more stable.

[0028] 12. A reset torsion spring is provided between the fixed plate and the transmission plate, so that when the entire leg support swings back and the driving device returns to its position, the torsion of the reset torsion spring can provide an additional restoring force, making the swing back smoother. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of state 1 of embodiment 1; Figure 2 yes Figure 1 A magnified view of the middle area of ​​; Figure 3 This is a schematic diagram of the main frame; Figure 4 It is a schematic diagram of the middle moving frame; Figure 5 yes Figure 1 A schematic diagram from another angle; Figure 6 is a schematic diagram of state 2 of embodiment 1; Figure 7 This is an enlarged view of the middle area in state 2; Figure 8 is a schematic diagram of the leg support of Example 1 in a folded state; Fig. 9 is a schematic diagram of the leg support of Example 1 in an extended state; Fig.10 yes Fig. 9 A partial enlarged view of .

[0030] In the figure: 1. Main frame, 11. Fixed frame, 12. Side frame, 14. Straight slot, 15. Upward slot, 16. Horizontal connecting frame, 17. Guide slot, 2. Seat frame, 3. Back frame, 4. Swing frame 1, 5. Middle moving frame, 51. Connecting rod plate, 52. Middle slide plate, 53. Push plate, 54. Slide slot, 541. Vertical slot, 542. Smooth slot, 55. Push edge, 6. Swing frame 2, 61. Contact wheel, 7. Leg bracket, 71. Transmission Driving device, 711, fixed plate, 712, transmission plate, 713, pushing plate, 72, leg slide, 721, horizontal slide groove, 73, leg base frame, 74, horizontal connecting bar, 741, short connecting bar, 742, oblique connecting bar, 75, ball connecting plate, 76, sliding connecting plate, 761, sliding joint, 81, connecting shaft, 82, pulling plate, 83, intermediate plate, 84, connecting rod, 9, driving device, 91, base, 92, push rod. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0033] Embodiment 1, as Figure 1 As shown, a movable frame suitable for a seat includes a main frame 1. The main frame 1 can be regarded as the main frame of the entire seat, and structural components such as chair legs can be installed on its lower surface. In the subsequent movement process, the main frame 1 can be regarded as a fixed part. A driving device 9 is installed on the main frame 1. In this case, the seat frame 2, the back frame 3 and the leg support 7 are three moving parts, which are the support frames of the user's seat, backrest and leg support, respectively, and the movement of these three parts depends on the operation of a driving device 9, rather than the operation of three driving parts. The small number of driving devices 9 saves layout space and reduces the overall weight of the product, so that such a frame structure can be applied not only to sofa chairs and massage chairs, but also to products with relatively light designs such as e-sports chairs and ergonomic chairs. The specific form of the driving device 9 can be electric steel, oil cylinder, air cylinder or other driving methods, which are not limited in this case.

[0034] Figure 3 and Figure 4 They are the structural schematic diagrams of the main frame 1 and the middle dynamic frame 5, Figure 2 It is a schematic diagram of these components after installation, in state 1, that is, the initial state. As shown in these three figures, the main frame 1 includes a fixed frame 11 located in the middle and two side frames 12 located on both sides, which are connected to each other by a cross-connecting frame 16 to increase the structural strength.

[0035] Figure 2 The driving device 9 includes a base 91, which is mounted on the main frame 1 and also serves as a fixed part. The push rod 92 is pushed out and the trajectory is linear. Figure 4 As shown, the push rod 92 is connected to the connecting rod plate 51, so that the entire middle moving frame 5 can slide relative to the main frame 1 as a moving part.

[0036] like Figure 3 and Figure 4 As shown, two parallel straight grooves 14 extending forward and backward are provided on the fixed frame 11. The forward and backward extending direction is also the direction of the trajectory of the push rod 92. The number of straight grooves 14 is not limited. In this case, there are two straight grooves 14 arranged in the height direction. Figure 4 The right part in the middle can be provided with a corresponding connecting shaft and a pulley so that the pulley can slide with the straight groove 14 as a track.

[0037] A slide groove 54 is provided on the middle slide plate 52. The slide groove 54 is L-shaped and includes a straight smooth groove 542 in the rear half and a vertical groove 541 in the front half. The two grooves are connected. The latter extends in the vertical direction. The two grooves are almost 90 degrees. A push edge 55 is provided on the vertical groove 541. An axle and a wheel are also provided here. Hereinafter, the push edge 55 and the wheel set 1 are in a cooperative relationship of pushing against each other. The wheel set 1 is also provided at the same time. Figure 3 The upward groove 15 in the embodiment extends slightly upward as it moves forward, and this extension can be a straight line or an arc.

[0038] And this wheel set is connected at the same time Figure 1 The shelf in the middle is 4.

[0039] The whole transmission mode is as follows: from the first state, the push rod 92 is continuously pushed forward, driving the whole middle moving frame 5 to move forward. At this time, the push edge 55 is against the wheel set 1, and is pushed forward. The wheel set 1 drives the swing frame 1 4 forward.

[0040] like Figure 5 As shown, the swing frame 14 is a key component that determines the movement of the seat frame 2 and the back frame 3. Specifically, the swing frame 14 is connected to the intermediate plate 83 through the pull plate 82, driving the intermediate plate 83 forward, that is, through the intermediate plate 83 Figure 3 The middle hole of the intermediate plate 83 is used to connect with the seat frame 2, that is, to drive the seat frame 2 to move forward. The uppermost hole of the intermediate plate 83 is used to connect with one end of the connecting rod 84, and the other end of the latter is connected to the main frame 1. In summary, the forward movement of the swing frame 14 drives the seat frame 2 to move forward.

[0041] At the same time, the other end of the pull plate 82 is connected to the lower end of the back frame 3, pulling the lower end of the back frame 3 forward. The middle of the back frame 3 is hinged to the seat frame 2, and this hinge point is referred to as hinge point a. Since the forward movement speed of the pull plate 82 is faster than the forward movement speed of the seat frame 2, the pull plate 82 moves forward relative to the seat frame 2, so the upper end of the back frame 3 falls backward, that is, Figure 5 The back frame 3 in the middle is centered at the hinge point a, and the upper end falls backwards.

[0042] At this point, the process of moving from state 1 to state 2 is referred to as stage A below. In this stage, the seat frame 2 and the back frame 3 move synchronously, the seat frame 2 gradually moves forward linearly, and the back frame 3 gradually falls down, with the lower end moving forward and the upper end moving backward; while the leg support 7 does not move.

[0043] Figures 1 to 5 ,These five pictures are schematic diagrams of the initial state of the seat, that is, state one. Figure 6 It is a schematic diagram of the state 2, and it can be seen that at this time, the back frame 3 has been tilted back and the seat frame 2 has moved forward. The seat frame 2 is connected to the guide wheel, and the side frame 12 is provided with a guide groove 17, and the guide wheel moves in the guide groove 17, so that the movement of the entire seat frame 2 is more stable.

[0044] like Figure 3 and Figure 4 As shown in FIG. 1 , since the wheel set 1 is in the upward groove 15, the wheel set 1 gradually rises. However, the trajectory of the middle moving frame 5 is determined by the normal straight groove 14, and the middle moving frame does not rise, so the wheel set 1 and the push edge 55 will separate. When the push rod 92 moves forward all the way to the moment of state 2, the state at this time is shown in FIG. Figure 7 Attached Figure 7 1 is a positional relationship diagram of the middle moving frame 5, the main frame 1, the swing frame 2 6, and the swing frame 1 4. In the figure, the wheel set 1 connected to the swing frame 1 4 is higher than the push edge 55, and the two are separated. The push edge 55 will no longer transmit the forward power to the swing frame 1 4. Therefore, the seat frame 2 and the back frame 3 will no longer receive the driving force from the push rod 92.

[0045] The leg support 7 is connected to the swing frame 2 6, which includes a resistance wheel 61. In state 1, the push plate 53 is far away from the resistance wheel 61, and the resistance wheel 61 does not receive resistance force. As the push rod 92 is pushed out, the push plate 53 moves forward, and in state 2, the push plate 53 has already resisted the resistance wheel 61, thereby providing driving force to the swing frame 2 6. As the push rod 92 continues to move forward, the leg support 7 starts to move.

[0046] At this point, the movement logic of the entire movable frame is that the sitting frame 2 moves forward first, and the back frame 3 turns backward. The two are carried out synchronously, and the coordination is good. At this time, the leg support 7 does not move, and the human body will not have an uncomfortable posture such as raising the legs high and the back is very straight. When it reaches state 2, that is, after the set backward posture, the legs slowly move up to improve comfort.

[0047] The whole process uses only one driving device 9, which has low space requirements and more controllable costs.

[0048] The movement of the leg support 7 is explained in detail below.

[0049] like Figure 8 , Fig. 9 and Fig.10 As shown, the swing frame 2 6 serves as a transmission component, and its function is to drive the entire leg support 7 to flip forward and backward in the vertical direction relative to the seat frame 2.

[0050] Specifically, the transmission device 71 is a multi-link structure, which consists of two sets, arranged on the left and right in the width direction of the seat. Each set has the same structure, and the fixed plate 711 is fixedly connected to the lower surface of the seat frame 2, and can be regarded as a fixed part relative to the seat frame 2. The swing frame 2 6 is connected to the transmission plate 712, one end of the transmission plate 712 is connected to the fixed plate 711, and the other end is hinged to the push plate 713. The other end of the push plate 713 is hinged to the leg base frame 73. At this point, during the forward movement of the swing frame 2 6, power is provided to the leg base frame 73. The leg base frame 73 swings and rises relative to the seat frame 2.

[0051] The leg slide 72 is slidably connected to the leg base 73 in the front-rear direction, the leg base 72 includes a guide straight groove, and the leg slide 72 includes an insertion slide for cooperating with the guide straight groove. The cooperation between the two makes the sliding process more stable.

[0052] The leg slide 72 is a component that actually supports the human body's legs, and the power for the leg slide 72 to slide back and forth relative to the leg base 73 comes from the sliding plate 76. Fig. 9 and Fig.10 As shown, the leg base frame 73 is connected to a transverse connecting bar 74, and the sliding connecting plate 76 is hinged thereto. The leg slide frame 72 includes a transverse connecting groove 721 extending along the horizontal width direction, and the front end of the sliding connecting plate 76 is provided with a sliding connecting head 761, which is arranged in the transverse connecting groove 721. Its rear end is connected to the seat frame 2 through the ball connecting plate 75. The connection between the ball connecting plate 75 and the seat frame 2 is connected by a ball head bearing, which allows the ball connecting plate 75 to move in multiple directions relative to the seat frame 2. The sliding connecting plate 76 and the ball connecting plate 75 can be connected by an L-shaped flat iron, because the side of the ball connecting plate 75 is more vertically flipped, and the side of the sliding connecting plate 76 is more horizontally flipped.

[0053] In summary, the movement principle of the entire leg support 7 is as follows: Figure 8 As shown, at first, the entire leg support 7 is in a retracted state, located below the seat frame 2, and not in contact with the human leg. Then the driving device 9 starts to move, and through the transmission of the swing frame 26, the push plate 713 swings upward and forward. Then, the leg base 73 swings forward and upward relative to the seat frame 2. Fig. 9 and Fig.10 As shown, during the outward swinging of the leg base frame 73, the sliding connecting plate 76 will rotate relative to the horizontal connecting bar 74. The ball connecting plate 75 and the seat frame 2 will rotate both horizontally and vertically, so the ball connecting plate 75 and the seat frame 2 are connected through a ball bearing. During the rotation of the sliding connecting plate 76 relative to the horizontal connecting bar 73, the sliding connecting head 761 will give a thrust to the groove wall of the horizontal sliding groove 721, thereby pushing the leg slide frame 72 to slide forward relative to the leg base frame 73. Fig. 9 and Fig.10 That is, the leg support 7 is swung upward and the leg slide 72 is slid forward.

[0054] At this point, on the one hand, in the normal state, the leg slide 72 is retracted, the leg support 7 is swung down, and stored under the seat frame 2, not taking up space. When the leg support is needed, the leg support 7 is swung up, and the leg slide 72 slides forward, effectively extending the distance of the support area, which can be suitable for the foot support of users with higher height and longer legs. On the other hand, in the whole process, the real power comes from only one set of driving device 9, without multiple sets of driving, further reducing the pressure of space placement.

[0055] In addition, due to the existence of the intermediate component of the sliding connecting plate 76, the forward sliding action of the foot slide frame 72 and the forward swinging action of the leg base frame 73 have good consistency and synchronization, and the movement of the entire leg support is smoother and more stable.

[0056] A reset torsion spring is provided between the fixed plate 711 and the transmission plate 712. Due to the presence of the reset torsion spring, when the driving device 9 returns to its original position during the swinging process of the entire leg support 7, the torsion of the reset torsion spring can provide an additional restoring force, making the swinging smoother.

[0057] A chair is provided, wherein a chair leg assembly is arranged on the lower surface of a main frame 1, a chair back is arranged on a back frame 3, and a seat cushion is arranged on a seat frame 2.

Claims

1. A movable frame suitable for a chair, comprising a main frame (1), a seat frame (2), a back frame (3) and a leg support (7), and further comprising a driving device (9), wherein the driving device (9) comprises a base (91) connected to the main frame (1) and a push rod (92) connected to the base (91), characterized in that: It also comprises a middle moving frame (5), the main frame (1) is provided with a straight groove (14) and an upward groove (15), the groove direction of the upward groove (15) is upward along the pushing direction of the push rod (92), the push rod (92) is connected to the middle moving frame (5), and pushes the middle moving frame (5) to slide along the straight groove (14); the middle moving frame (5) comprises a middle slide plate (52), a slide groove (54) provided on the middle slide plate (52), and a push plate (53) connected to the middle slide plate (52); it also comprises a swing frame (4), the swing frame (4) is slidably connected to the upward groove (15) through a connecting frame shaft (81); the slide groove (54) comprises a smooth groove (542) and a vertical groove (541) extending in the vertical direction and penetrating the smooth groove (542), and a push edge (55) for pushing the connecting frame shaft (81) forward is provided in the vertical groove (541); The swing frame 1 (4) is connected to the seat frame (2) and the back frame (3); the leg support (7) is connected to the swing frame 2 (6), and the push plate (53) is used to contact the swing frame 2 (6) to push the leg support (7) to move.

2. The movable frame suitable for a seat according to claim 1, characterized in that: The middle moving frame (5) comprises a connecting rod plate (51) for connecting to the push rod (92), and there are two middle sliding plates (52) respectively connected to two sides of the connecting rod plate (51).

3. The movable frame suitable for a seat according to claim 1, characterized in that: The number of the conventional straight grooves (14) is more than two and they are arranged in different height directions.

4. The movable frame suitable for a seat according to claim 1, characterized in that: The main frame (1) further comprises two side frames (12), a transverse connecting frame (16) connecting the two side frames (12), and a fixed frame (11) connected to the middle of the transverse connecting frame (16), and the straight groove (14) and the upward groove (15) are both provided on the fixed frame (11).

5. The movable frame suitable for a seat according to claim 4, characterized in that: The side frame (12) is provided with a guide groove (17), and the seat frame (2) slides along the guide groove (17) via a guide wheel.

6. The movable frame suitable for a seat according to claim 5, characterized in that: Each side frame (12) is provided with more than two guide grooves (17), and the arrangement direction is the pushing direction of the push rod (92).

7. The movable frame suitable for a seat according to claim 1, characterized in that: The swing frame 1 (4) is connected to a pull plate (82), the pull plate (82) is connected to the back frame (3), the back frame (3) is connected to the seat frame (2), and the back frame (3) rotates relative to the seat frame (2) under the drive of the pull plate (82).

8. The movable frame suitable for a seat according to claim 7, characterized in that: The seat frame (2) is hinged with an intermediate plate (83), one end of the intermediate plate (83) is connected to the pull plate (82), and the other end is connected to a connecting rod (84), and the connecting rod (84) is connected to the main frame (1).

9. The movable frame suitable for a seat according to claim 1, characterized in that: The second swing frame (6) comprises a contact wheel (61), and the contact wheel (61) contacts the push plate (53).

10. The movable frame suitable for a seat according to claim 1, characterized in that: The leg support (7) comprises a leg base frame (73) which rotates relative to the seat frame (2) under the drive of the driving device (9), a leg slide (72) which is slidably connected to the leg base frame (73), a transverse connecting bar (74) connected to the leg base frame (73), and a sliding connecting plate (76) which is hinged to the transverse connecting bar (74), wherein a transverse sliding groove (721) is provided on the leg slide (72), one end of the sliding connecting plate (76) comprises a sliding joint (761) for sliding in the transverse sliding groove (721), and the other end is connected to a ball connecting plate (75), and the ball connecting plate (75) is connected to the seat frame (2) via a ball head bearing.

11. The movable frame suitable for a seat according to claim 10, characterized in that: The transverse connecting bar (74) is bent and comprises a short connecting bar (741) and an oblique connecting bar (742); the position where the oblique connecting bar (742) is connected to the leg base frame (73) is closer to the seat frame (2) than the position where the short connecting bar (741) is connected to the leg base frame (73).

12. The movable frame suitable for a seat according to claim 10, characterized in that: The leg base (73) is connected to the seat frame (2) via a transmission device (71). The transmission device (71) comprises a fixed plate (711) connected to the seat frame (2), a transmission plate (712) hinged to the fixed plate (711), and a push plate (713) hinged to the transmission plate (712) and the leg base (73) at both ends. The power of the driving device (9) is applied to the transmission plate (712).

13. The movable frame suitable for a seat according to claim 12, characterized in that: A return torsion spring is provided between the fixing plate (711) and the transmission plate (712).

14. The movable frame suitable for a seat according to claim 10, characterized in that: The leg base frame (73) includes a straight guide groove, and the leg slide frame (72) includes an insertion slide for cooperating with the straight guide groove.

15. A seat, characterized in that It comprises a movable frame suitable for a seat as described in any one of claims 1 to 14, and also comprises a seat stool, a lumbar support and a leg support, wherein the seat stool is mounted on the seat frame (2), the lumbar support is mounted on the back frame (3), and the leg support is mounted on the leg support (7).

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