A seat stand and a seat

Abstract

The utility model relates to furniture technical field discloses a kind of seat frame and seat, wherein, seat frame includes: chair seat device, including first transmission component and movable seat, the first transmission component with the movable seat transmission connection;Leg support device, including leg bracket and second transmission component, the second transmission component is set between the leg bracket and the movable seat;Driving source, with the first transmission component, the second transmission component transmission connection, wherein, the driving source can be by the second transmission component drive the leg bracket to extend or retract the movable seat, or the driving source can be by the first transmission component drive the movable seat and the leg bracket synchronous reciprocating activity, the utility model can adjust the position of seat frame and leg bracket according to use needs, and reduce the quantity of driving source, better control the production, maintenance cost of whole.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a seat frame and seating. Background Technology

[0002] As seating functions become increasingly sophisticated, some seats now feature adjustable frames that can be switched between sitting, TV (TV) posture, and reclining positions. The frame can be adjusted from sitting to TV posture, then back to reclining, or vice versa. This adjustment requires repositioning the seat cushion and leg rest. Some seats incorporate separate actuators for each, but this increases overall production and maintenance costs. Therefore, a more efficient seat frame design is needed to better adjust the position of the seat cushion and leg rest. Utility Model Content

[0003] The purpose of this utility model is to provide a seat frame and seating to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is:

[0005] A seat frame includes: a seat assembly including a first transmission component and a movable seat, the first transmission component being convexly connected to the movable seat; a leg support assembly including a leg support bracket and a second transmission component, the second transmission component being disposed between the leg support bracket and the movable seat; and a drive source being convexly connected to the first transmission component and the second transmission component, wherein the drive source is capable of driving the leg support bracket to extend or retract from the movable seat via the second transmission component, or the drive source is capable of driving the movable seat and the leg support bracket to reciprocate synchronously via the first transmission component.

[0006] This technical solution has at least the following beneficial effects: a seat cushion can be installed on the movable seat for users to sit or lie down, and a leg pad can be installed on the leg rest to provide support for the user's legs. Both the movable seat and the leg rest are movable to adjust the usage state. When the seat is between the sitting and TV positions, the drive source drives the second transmission component to move, which in turn drives the leg rest to extend or retract from the movable seat, thereby adjusting the relative position of the leg rest and the movable seat. When the seat is between the TV and lying positions, the drive source drives the first transmission component to move, which in turn drives the movable seat to reciprocate. At this time, the second transmission component on the movable seat and the leg rest also move synchronously, thereby adjusting the position of the seat and the leg rest together to switch the overall usage state. In this way, the position of the seat and the leg rest can be adjusted according to usage needs, improving the flexibility of position adjustment, reducing the number of drive sources, and better controlling the overall production and maintenance costs.

[0007] As a further improvement to the above technical solution, the present invention also includes a foot support device, which includes a foot bracket and a third transmission component. The leg bracket is provided with a rotatable first tooth. The third transmission component is connected between the foot bracket and the leg bracket. The third transmission component has a second tooth that can mesh with the first tooth. When the second tooth meshes with the first tooth and rotates, the third transmission component can drive the foot bracket away from the leg bracket, or drive the foot bracket closer to the leg bracket.

[0008] As a further improvement to the above technical solution, the third transmission component includes a transmission block and a first rotating joint. The transmission block and the first rotating joint are respectively rotatably disposed on the leg bracket. The transmission block is connected to the first rotating joint in a transmission manner. The second tooth is disposed on the transmission block. The foot bracket is disposed on the first rotating joint. The transmission block can drive the first rotating joint to rotate closer to or away from the leg bracket.

[0009] As a further improvement to the above technical solution, the first rotating pair includes a first connecting rod and a second connecting rod. One end of the first connecting rod is rotatably connected to the leg bracket, and the other end of the first connecting rod is rotatably connected to the foot bracket. One end of the second connecting rod is eccentrically rotatably connected to the transmission block, and the other end of the second connecting rod is rotatably connected to the foot bracket.

[0010] As a further improvement to the above technical solution, the second tooth portion includes a plurality of transmission teeth formed on the outside of the transmission block, and the plurality of transmission teeth are arranged around the rotation axis of the transmission block.

[0011] As a further improvement to the above technical solution, a drive block is rotatably connected to the leg bracket, and the first tooth includes a plurality of drive teeth formed on the outside of the drive block, the drive teeth being arranged around the rotation axis of the drive block.

[0012] As a further improvement to the above technical solution, the second transmission component is connected to the drive block in a transmission manner, and the second transmission component can drive the drive block to rotate when it is in motion.

[0013] As a further improvement to the above technical solution, the second transmission assembly includes a first connecting rod, a second connecting rod, and a second rotating joint. One end of the first connecting rod is rotatably connected to the leg bracket, and one end of the second connecting rod is eccentrically rotatably connected to the drive block. The other ends of the first connecting rod and the other ends of the second connecting rod are respectively connected to the second rotating joint. The drive source is connected to the second rotating joint, and the drive source can drive the second rotating joint to rotate relative to or away from the leg bracket.

[0014] As a further improvement to the above technical solution, the second rotating pair includes a third link and a fourth link, which are arranged at intervals. The top ends of the third link and the fourth link are rotatably connected to the movable seat, respectively. The bottom end of the third link is rotatably connected to the end of the first link away from the leg bracket. The bottom end of the fourth link is rotatably connected to the first link near the third link. The bottom end of the fourth link is rotatably connected to the end of the second link away from the drive block. The drive source is connected to the third link or the fourth link.

[0015] As a further improvement to the above technical solution, the chair seat device includes a base, and the movable seat is slidably connected to the base.

[0016] As a further improvement to the above technical solution, the first transmission assembly includes a first linkage mechanism and a second linkage mechanism that are mutually connected. The first linkage mechanism is connected between the base and the movable seat and has an unfolded or folded state. The second linkage mechanism is connected to the drive source, the base and the first linkage mechanism, and has an unfolded or folded state. When the movable seat slides on the base, one of the first linkage mechanism and the second linkage mechanism tends to be in an unfolded state, and the other tends to be in a folded state.

[0017] As a further improvement to the above technical solution, the drive source has a first end and a second end that can move closer to or further away from each other. The first end of the drive source is drively connected to the second linkage mechanism, and the second end of the drive source is rotatably connected to the movable seat.

[0018] As a further improvement to the above technical solution, the first linkage mechanism includes a first transmission rod and a second transmission rod that are rotatably connected to each other. The first transmission rod is rotatably connected to the base, and the second transmission rod is rotatably connected to the movable seat. The second linkage mechanism is driven by the second transmission rod. When the first transmission rod and the second transmission rod rotate to move away from each other, the first linkage mechanism is in an unfolded state; when the first transmission rod and the second transmission rod rotate to move closer to each other, the first linkage mechanism is in a folded state.

[0019] As a further improvement to the above technical solution, the second linkage mechanism includes a third transmission rod and a fourth transmission rod that are rotatably connected to each other. The second transmission rod and the first end of the drive source are respectively rotatably connected to the third transmission rod. The fourth transmission rod is rotatably connected to the base. When the third transmission rod and the fourth transmission rod rotate to move away from each other, the second linkage mechanism is in an unfolded state. When the third transmission rod and the fourth transmission rod rotate to move closer to each other, the second linkage mechanism is in a folded state.

[0020] As a further improvement to the above technical solution, a transmission component is provided between the first end of the drive source and the third transmission rod, and the two sides of the transmission component are respectively rotatably connected to the third transmission rod and the first end of the drive source.

[0021] As a further improvement to the above technical solution, a transmission pipe is connected to one side of the transmission component, and the transmission pipe is rotatably connected to the third transmission rod.

[0022] As a further improvement to the above technical solution, a first recess is provided on the top side of the first transmission rod. The first recess is used to avoid the transmission tube when it approaches. When the first linkage mechanism is in a folded state, the transmission tube abuts against the first recess.

[0023] As a further improvement to the above technical solution, a second recess is provided on the top side of the transmission component. The second recess is used to avoid the drive source when it is relatively close to it. When the second linkage mechanism is in a folded state, the first end of the drive source abuts against the second recess.

[0024] As a further improvement to the above technical solution, a first elastic component is connected between the first transmission rod and the base. When the first linkage mechanism moves from a folded state to an unfolded state or from an unfolded state to a folded state, the first elastic component first elastically deforms and then elastically recovers.

[0025] As a further improvement to the above technical solution, the maximum elastic force of the first elastic component is less than 500 Newtons; when the first linkage mechanism is in a folded state, the first elastic component is vertically arranged, and the first transmission rod is located below the first elastic component.

[0026] As a further improvement to the above technical solution, the second transmission assembly is provided with a first limiting component, and the movable seat is rotatably connected with a locking component and a second limiting component. The second limiting component is used to limit the relative sliding between the base and the movable seat. The locking component can be rotatably matched with the first limiting component or the second limiting component, wherein the locking component is matched with the first limiting component to limit the movement of the second transmission assembly, or the locking component is matched with the second limiting component to limit the movement of the first transmission assembly.

[0027] As a further improvement to the above technical solution, one end of the locking component is used to match the first limiting component, and the other end of the locking component is used to match the second limiting component.

[0028] As a further improvement to the above technical solution, a locking component is provided between the second limiting component and the base, the locking component being used to restrict the relative sliding between the base and the movable seat.

[0029] As a further improvement to the above technical solution, the snap-fit ​​assembly includes a snap-fit ​​component disposed on the movable seat and a snap-fit ​​groove disposed on the second limiting component. When the end of the locking component matches the second limiting component, the snap-fit ​​component is confined inside the snap-fit ​​groove.

[0030] As a further improvement to the above technical solution, the second limiting component includes a first extension and a second extension, which define the slot.

[0031] As a further improvement to the above technical solution, a second elastic component is provided between the second limiting component and the movable seat. The two ends of the second elastic component are respectively connected to the movable seat and the first extension. When the locking component disengages from the slot, the second elastic component can drive the second limiting component to rotate through elastic force.

[0032] A seating arrangement includes a seat frame as described above, the seat frame having a sitting position, a TV position, and a reclining position. When the seat frame is located between the sitting position and the TV position, the drive source can drive the leg support to extend or retract the movable seat via a second transmission component. When the seat frame is located between the TV position and the reclining position, the drive source can drive the movable seat and the leg support to reciprocate synchronously via a first transmission component.

[0033] This technical solution has at least the following beneficial effects: In this seating arrangement, when the seat frame is between a sitting position and a TV position, the drive source drives the second transmission component to move, which in turn drives the leg support to extend or retract the movable seat, thereby adjusting the relative position of the leg support and the movable seat. When the seat frame is in a TV position or a reclining position, the drive source drives the first transmission component to move, which in turn drives the movable seat to reciprocate. At this time, the second transmission component located on the movable seat and the leg support also move synchronously, thereby adjusting the positions of the seat frame and the leg support together to switch the overall usage state. In this way, the positions of the seat frame and the leg support can be adjusted according to usage needs, improving the flexibility of position adjustment, reducing the number of drive sources, and better controlling the overall production and maintenance costs.

[0034] As a further improvement to the above technical solution, the present invention also includes a back support, which is rotatably connected to the movable seat. The back support can rotate downward away from the movable seat or rotate upward towards the movable seat.

[0035] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0037] Figure 1 This is a first schematic diagram of the internal structure of this utility model, in which the movable seat is in a sitting position.

[0038] Figure 2 This is a second schematic diagram of the internal structure of this utility model, in which the leg support is located in the position of extending or retracting the movable seat.

[0039] Figure 3 This is a third schematic diagram of the internal structure of this utility model, in which the movable seat switches between a sitting position and a lying position.

[0040] Figure 4 This is the fourth schematic diagram of the internal structure of this utility model, in which the movable seat is in a lying position.

[0041] Figure 5 This is the first perspective view of the present invention, in which the movable seat is in a seated position.

[0042] Figure 6 This is the second perspective view of the present invention, in which the movable seat switches between a sitting position and a lying position.

[0043] Figure 7 This is the third perspective view of the present invention, in which the leg support is located in the position of extending or retracting the movable seat.

[0044] Figure 8 This is the fourth perspective view of the present invention, in which the movable seat is in a lying position.

[0045] In the attached diagram: 100 - base, 200 - movable seat, 210 - first linkage mechanism, 211 - first transmission rod, 212 - second transmission rod, 213 - first recess, 300 - drive source, 310 - second linkage mechanism, 311 - third transmission rod, 312 - fourth transmission rod, 320 - transmission component, 321 - second recess, 330 - transmission tube, 340 - transmission frame, 350 - first elastic component, 400 - back support, 500 - leg bracket, 510 - drive block, 511 - first tooth, 520 - second transmission assembly, 5 21-First link, 5211-Connecting section, 5212-Inclined section, 522-Second link, 523-Third link, 524-Fourth link, 600-Foot bracket, 610-Transmission block, 611-Second tooth, 620-First rotating pair, 621-First connecting rod, 622-Second connecting rod, 710-First limiting component, 720-Locking component, 730-Second limiting component, 731-Slot, 7311-First extension, 7312-Second extension, 740-Snap-fit ​​component, 750-Second elastic component. Detailed Implementation

[0046] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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.

[0048] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0049] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 application based on the specific circumstances.

[0050] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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 may be combined in any suitable manner in one or more embodiments or examples.

[0051] Reference Figures 1 to 8 A seating frame includes a seat assembly, a leg support assembly, and a drive source 300. The seat assembly includes a first transmission component and a movable seat 200, with the first transmission component being operatively connected to the movable seat 200. The leg support assembly includes a leg rest 500 and a second transmission component 520, with the second transmission component 520 disposed between the leg rest 500 and the movable seat 200. The drive source 300 is operatively connected to the first transmission component and the second transmission component 520. The drive source 300 can drive the leg rest 500 to extend or retract from the movable seat 200 via the second transmission component 520, or the drive source 300 can drive the movable seat 200 and the leg rest 500 to reciprocate synchronously via the first transmission component.

[0052] In this seating frame, a seat cushion can be installed on the movable seat 200 for the user to sit or lie down, and a leg rest can be installed on the leg support 500 to provide support for the user's legs. Both the movable seat 200 and the leg rest 500 are movable to adjust the usage position. When the seating frame is in a sitting position or a TV position, the drive source 300 drives the second transmission component 520 to move, which in turn drives the leg rest 500 to extend or retract from the movable seat 200, thereby adjusting the relative position of the leg rest 500 and the movable seat 200. When the seat is in the TV position or reclining position, the drive source 300 drives the first transmission component to move, which in turn drives the movable seat 200 to reciprocate. At the same time, the second transmission component 520 and the leg support 500 located on the movable seat 200 also move synchronously, thereby adjusting the positions of the seat and the leg support 500 together to switch the overall usage state. In this way, the positions of the seat and the leg support 500 can be adjusted according to usage needs, improving the flexibility of position adjustment, reducing the number of drive sources 300, and better controlling the overall production and maintenance costs.

[0053] To also support the user's feet, this utility model also includes a foot support device, which includes a foot support 600 and a third transmission component. The leg support 500 is provided with a rotatable first tooth 511. The third transmission component is connected between the foot support 600 and the leg support 500. The third transmission component has a second tooth 611, which can mesh with the first tooth 511. When the second tooth 611 meshes with the first tooth 511 and rotates, the third transmission component can drive the foot support 600 away from the leg support 500, or drive the foot support 600 closer to the leg support 500.

[0054] A foot pedal can be installed on the footrest 600 to provide support for the user's feet during use. When the foot pedal function is not needed, the first tooth 511 on the base assembly rotates, and the meshing of the first tooth 511 and the second tooth 611 transmits power to the transmission assembly, thereby moving the footrest 600 closer to the base assembly, so that the footrest 600 is in a retracted state. When the foot pedal function is needed, the first tooth 511 on the base reverses, and the meshing of the first tooth 511 and the second tooth 611 transmits power to the transmission assembly. The component drives the foot bracket 600 away from the base assembly and opens outward from the base assembly. During the opening or retraction of the foot bracket 600, power is transmitted through the first tooth 511 and the second tooth 611, which enables the foot bracket 600 to rotate and open or retract. This reduces the number of linkage transmission structures required in the entire foot pedal transmission, thereby reducing the space requirements and lowering the risk of the transmission component touching the ground during operation. This is also applicable to longer foot pedals, improving the stability of using the foot pedal function.

[0055] In practical applications, leg supports 500 are provided on the left and right sides of the movable seat 200, and foot supports 600 are also provided on the two leg supports 500.

[0056] When the second tooth 611 in the third transmission assembly is subjected to power transmission, the rod-shaped structure in the third transmission assembly can slide back and forth to move the foot support 600 closer to or away from the leg support 500. If it is necessary to rotate the foot support 600 closer to or away from the leg support 500, in this embodiment, the third transmission assembly includes a transmission block 610 and a first rotating joint 620. The transmission block 610 and the first rotating joint 620 are respectively rotatably disposed on the leg support 500. The transmission block 610 and the first rotating joint 620 are connected in a transmission manner. The second tooth 611 is disposed on the transmission block 610, and the foot support 600 is disposed on the first rotating joint 620. The transmission block 610 can drive the first rotating joint 620 to rotate closer to or away from the leg support 500. When the second tooth 611 transmits power to the first tooth 511, the transmission block 610 rotates and drives the first rotary joint 620 to rotate on the leg bracket 500, thereby moving the foot bracket 600 closer to or further away from the leg bracket 500.

[0057] In order to enable the footrest 600 to rotate relative to the first rotating joint 620 when it is opened or closed, thereby achieving further storage, in this embodiment, the first rotating joint 620 includes a first connecting rod 621 and a second connecting rod 622. One end of the first connecting rod 621 is rotatably connected to the leg rest 500, and the other end of the first connecting rod 621 is rotatably connected to the footrest 600. One end of the second connecting rod 622 is eccentrically rotatably connected to the transmission block 610, and the other end of the second connecting rod 622 is rotatably connected to the footrest 600. The first linkage 621, leg support 500, transmission block 610, and second linkage 622 form a four-bar linkage mechanism. When the foot support 600 needs to be opened, the transmission block 610 rotates, and the first linkage 621 and the second linkage 622 are driven to rotate and unfold from the leg support 500. The foot support 600 is also driven to rotate away from the first linkage 621 and the second linkage 622. Similarly, when the foot support 600 needs to be retracted, the transmission block 610 reverses, and the first linkage 621 and the second linkage 622 are driven to retract to the leg support 500. The foot support 600 is also driven to rotate and approach the first linkage 621 and the second linkage 622. At this time, the foot support 600, the first linkage 621, and the second linkage 622 are folded back onto the leg support 500, greatly reducing the volume occupied by the foot support 600 after it is retracted.

[0058] The second toothed portion 611 primarily drives the third transmission component through toothed power transmission. Its structural form can vary; for example, a gear can be mounted on the transmission block 610, directly meshing with the first toothed portion 511. To further simplify the structure, in this embodiment, the second toothed portion 611 includes multiple transmission teeth formed on the outer side of the transmission block 610, arranged around the rotation axis of the transmission block 610. By directly forming transmission teeth for power transmission on the outer side of the transmission block 610, and having multiple transmission teeth covering the rotation path of the transmission block 610, the power transmission structure is further simplified. The transmission block 610 itself both transmits power and acts as a connecting rod to drive the second connecting rod 522 to rotate.

[0059] Similarly, a gear can be installed on the leg support 500. In this case, the gear is used as the first tooth 511 to realize the power transmission to the second tooth 611. In order to further simplify the transmission structure, in this embodiment, a drive block 510 is rotatably connected to the leg support 500. The first tooth 511 includes a plurality of drive teeth formed on the outside of the drive block 510. The drive teeth are arranged around the rotation axis of the drive block 510.

[0060] The second transmission component 520 can be directly connected to the drive block 510. In this case, when the second transmission component 520 is active, it will not transmit power to the drive block 510. Alternatively, the power of the second transmission component 520 can also be directly transmitted to the drive block 510. This can realize the linkage between the second transmission component 520 and the drive block 510. Specifically, the second transmission component 520 is connected to the drive block 510. When the second transmission component 520 is active, it can drive the drive block 510 to rotate. When the second transmission component 520 unfolds or folds back, its internal unfolding or folding structure transmits power to the drive block 510, causing the drive block 510 to rotate. This enables the second transmission component 520 to rotate when it extends or retracts. For example, when the second transmission component 520 unfolds, it causes the leg support 500 to open outwards, and at the same time, it causes the drive block 510 to rotate, causing the foot support 600 to open away from the leg support 500. Alternatively, when the second transmission component 520 folds back, it causes the leg support 500 to retract, and at the same time, it causes the drive block 510 to rotate, causing the foot support 600 to retract towards the leg support 500.

[0061] There are multiple ways to fold the second transmission component 520 to achieve unfolding or retraction. Specifically, the second transmission component 520 includes a first connecting rod 521, a second connecting rod 522, and a second rotating joint. One end of the first connecting rod 521 is rotatably connected to the leg bracket 500, and one end of the second connecting rod 522 is eccentrically rotatably connected to the drive block 510. The other ends of the first connecting rod 521 and the other ends of the second connecting rod 522 are respectively connected to the second rotating joint. The drive source 300 is connected to the second rotating joint. The drive source 300 can drive the second rotating joint to rotate relative to or away from the leg bracket 500. At this time, the drive source 300 can be a rotary drive such as a motor or a rotary cylinder, or a linear drive can be used to drive the second rotating joint to rotate. When the second rotary joint rotates, the leg support 500 and the drive block 510 can be rotated via the first link 521 and the second link 522. At this time, the first link 521 and the second link 522 can also rotate relative to the second rotary joint, realizing folding and unfolding simultaneously. For example, when the second rotary joint rotates out from the seat frame of the seat, the first link 521 and the second link 522 can also gradually unfold relative to the second rotary joint, thereby opening the leg support 500, and the second link 522 can drive the drive block 510 to rotate on the leg support 500. When the second rotary joint rotates back from the seat frame of the seat, the first link 521 and the second link 522 can also gradually fold back relative to the second rotary joint, thereby retracting the leg support 500, and the second link 522 can drive the drive block 510 to rotate in the opposite direction on the leg support 500.

[0062] As a specific embodiment of the second rotating joint, the second rotating joint includes a third link 523 and a fourth link 524. The third link 523 and the fourth link 524 are arranged at intervals. The top ends of the third link 523 and the fourth link 524 are respectively rotatably connected to the movable seat 200. The bottom end of the third link 523 is rotatably connected to the end of the first link 521 away from the leg bracket 500. The bottom end of the fourth link 524 is rotatably connected to the first link 521 near the third link 523. The bottom end of the fourth link 524 is rotatably connected to the end of the second link 522 away from the drive block 510. The drive source 300 is drivingly connected to the third link 523 or the fourth link 524. The rotating connection points formed at the top ends of the third link 523 and the fourth link 524 are respectively used to connect to the structural components of the external device, such as the seat frame of the chair. At this time, the structural components of the external device, the third link 523, the fourth link 524 and the first link 521 can form a four-bar linkage. In use, the power source of the external device drives the third link 523 or the fourth link 524 to rotate. When the leg support 500 is needed, the third link 523 and the fourth link 524 rotate outward from the seat frame. At this time, the first link 521 and the second link 522 can be pushed outward in an unfolded state, thereby opening the leg support 500. When the leg support 500 is not needed, the third link 523 and the fourth link 524 rotate and retract into the seat frame. At this time, the first link 521 and the second link 522 can be folded inward, thereby retracting the leg support 500.

[0063] To better raise the height of the leg support 500 when the first link 521 is pushed outward, the first link 521 and the second link 522 are inclined upward after unfolding, pushing the leg support 500 upward. Specifically, the first link 521 includes a connecting section 5211 and an inclined section 5212 connected to each other. The inclined section 5212 is inclined upward along the direction close to the leg support 500. The bottom end of the third link 523 is rotatably connected to the end of the connecting section 5211 away from the inclined section 5212. The bottom end of the fourth link 524 is rotatably connected to the connection between the connecting section 5211 and the inclined section 5212. The top end of the inclined section 5212 is rotatably connected to the leg support 500. The connecting section 5211 of the first link 521 is used to connect the third link 523 and the fourth link 524. At this time, the connecting section 5211, the third link 523, the fourth link 524 and the seat frame form a four-bar linkage. The inclined section 5212, which is inclined upward, is conducive to raising the installation height of the leg support 500. When the third link 523 and the fourth link 524 rotate, the connecting section 5211 drives the inclined section 5212 to act on the leg support 500. Together with the second link 522, the leg support 500 is supported by the drive block 510, so that the leg support 500 moves upward when it is opened, or moves downward when it is retracted.

[0064] As a specific structural embodiment of the chair seat device, the chair seat device includes a base 100, and the movable seat 200 is slidably connected to the base 100. The base 100 provides support for the whole, and when the user needs to change posture during use, the movable seat 200 slides back and forth on the base 100 to adapt to the need for adjusting the posture of the seat cushion.

[0065] In order to make the movement of the movable seat 200 more stable and improve the user experience when the movable seat 200 moves on the base 100, in this embodiment, the first transmission component includes a first linkage mechanism 210 and a second linkage mechanism 310 that are connected to each other. The first linkage mechanism 210 is connected between the base 100 and the movable seat 200 and has an unfolded or folded state. The second linkage mechanism 310 is connected to the drive source 300, the base 100 and the first linkage mechanism 210 and has an unfolded or folded state. When the movable seat 200 slides on the base 100, one of the first linkage mechanism 210 and the second linkage mechanism 310 tends to be in an unfolded state and the other tends to be in a folded state.

[0066] When the first linkage 210 is in the unfolded state, the angle between two adjacent links within the first linkage 210 is relatively large. Conversely, when the second linkage 310 is in the folded state, the angle between two adjacent links within the second linkage 310 is relatively small. When either the first linkage 210 or the second linkage 310 moves under the drive of the drive source 300, the first linkage 210 transitions to the folded state, and the second linkage 310 transitions to the unfolded state. During this process, the angle between two adjacent links within the first linkage 210 gradually decreases, and the speed of outward power transmission decreases. Meanwhile, the angle between the second linkage 210 and the second linkage 310 gradually decreases. The angle between two adjacent rods within 310 gradually increases, and the speed of power transmission outward increases from slow to fast. After balancing the changes in the speed of power transmission between the two linkage mechanisms, the movable seat 200 is driven to move, allowing the movable seat 200 to maintain a constant speed. Conversely, when the first linkage mechanism 210 moves from the folded state to the unfolded state, and the second linkage mechanism 310 moves from the unfolded state to the folded state, the movable seat 200 can also move at a constant speed on the base 100. This allows for uniform adjustment of the position of the movable seat 200, improving the convenience and stability of position adjustment and positioning, thereby enhancing the user experience of the seating.

[0067] The drive source 300 can provide power in a rotational manner. However, in this embodiment, when the drive source 300 provides power in a linear reciprocating motion, the drive source 300 has a first end and a second end that can move closer to or further away from each other. The first end of the drive source 300 is driveably connected to the second linkage mechanism 310, and the second end of the drive source 300 is rotatably connected to the movable seat 200. Thus, by the relative approach or distance between the first end and the second end, a driving force is provided for the relative movement of the second linkage mechanism 310 and the movable seat 200.

[0068] When the drive source 300 is connected to the second link 522, the second end of the drive source 300 can be directly hinged or universally connected to the second link 522. To improve the structural stability of the transmission connection, in this embodiment, the second link 522 is connected to a transmission frame 340, and the second end of the drive source 300 is rotatably connected to the transmission frame 340. By rotatably connecting the transmission frame 340 to the second end of the drive source 300, a structure that is compatible with the second end of the drive source 300 can be easily set on the transmission frame 340, improving the convenience and structural stability of the connection. In practical applications, one end of the transmission frame 340 is used to fix the second link 522, and the other end can form two spaced-apart connecting parts extending to both sides of the second end of the drive source 300. Rotatably connecting the second end of the drive source 300 to the two connecting parts can improve the stability of the transmission connection with the second link 522.

[0069] The first linkage mechanism 210 includes multiple relatively rotatable transmission rods. A transmission angle is formed between adjacent transmission rods. When one transmission rod transmits power outward, the speed of power transmission varies with the size of the transmission angle. In this embodiment, the first linkage mechanism 210 can be a two-bar linkage. Specifically, the first linkage mechanism 210 includes a first transmission rod 211 and a second transmission rod 212 rotatably connected to each other. The first transmission rod 211 is rotatably connected to the base 100, and the second transmission rod 212 is rotatably connected to the movable seat 200. The second linkage mechanism 310 is drively connected to the second transmission rod 212, and the first transmission rod 211 and the second transmission rod 212 rotate... When the first linkage mechanism 210 moves away from each other, it is in an unfolded state. When the first transmission rod 211 and the second transmission rod 212 rotate to move closer to each other, the first linkage mechanism 210 is in a folded state, and a first transmission angle is formed between the first transmission rod 211 and the second transmission rod 212. When the first linkage mechanism 210 tends to be in an unfolded state, the first transmission angle tends to be larger. When the first linkage mechanism 210 tends to be in a folded state, the first transmission angle tends to be smaller. In practical applications, one end of the first transmission rod 211 is rotatably connected to the base 100, and the other end is rotatably connected to one end of the second transmission rod 212. The other end of the second transmission rod 212 is rotatably connected to the movable seat 200.

[0070] like Figure 2 and Figure 6 As shown, the first transmission rod 211 and the second transmission rod 212 form a two-bar linkage mechanism. When the movable seat 200 is in a seated position, the second transmission rod 212 is close to the first transmission rod 211. At this time, the first transmission angle is small. When the second end of the drive source 300 moves away from the first end, the second transmission rod 212 will be driven to rotate away from the first transmission rod 211 through the second linkage mechanism 310. At this time, the first transmission angle gradually increases, and the movement speed of the second transmission rod 212 increases. This can balance the gradually decreasing speed of the second linkage mechanism 310 during the transmission process, thereby driving the movable seat 200 to move at a uniform speed.

[0071] Similarly, the second linkage mechanism 310 includes multiple relatively rotatable transmission rods. A transmission angle is formed between adjacent transmission rods. When one transmission rod transmits power outward, the speed of power transmission varies with the size of the transmission angle. In this embodiment, the second linkage mechanism 310 can be a two-bar linkage. Specifically, the second linkage mechanism 310 includes a third transmission rod 311 and a fourth transmission rod 312 that are rotatably connected to each other. The second transmission rod 312 and the first end of the drive source 300 are rotatably connected to the third transmission rod 311. The fourth transmission rod 312... 12 is rotatably connected to the base 100. When the third transmission rod 311 and the fourth transmission rod 312 rotate to move away from each other, the second linkage mechanism 310 is in an unfolded state; when the third transmission rod 311 and the fourth transmission rod 312 rotate to move closer to each other, the second linkage mechanism 310 is in a folded state, and a second transmission angle is formed between the third transmission rod 311 and the fourth transmission rod 312. When the second linkage mechanism 310 tends to be in an unfolded state, the second transmission angle tends to increase; when the second linkage mechanism 310 tends to be in a folded state, the second transmission angle tends to decrease.

[0072] like Figure 2 and Figure 6 As shown, the third transmission rod 311 and the fourth transmission rod 312 form a two-bar linkage. When the movable seat 200 is in a seated position, the third transmission rod 311 is away from the fourth transmission rod 312. At this time, the second transmission angle is relatively large. When the second end of the drive source 300 moves away from the first end, the third transmission rod 311 will drive the power to be transmitted to the fourth transmission rod 312. During this process, the second transmission angle gradually decreases, and the speed at which the third transmission rod 311 outputs power decreases, while the first transmission angle gradually increases, and the speed at which the second transmission rod 312 outputs power increases. This solves the problem of the speed change of the first linkage mechanism 210 and the second linkage mechanism 310 during the transmission process, thereby driving the movable seat 200 to move at a uniform speed.

[0073] In the above embodiment, the first end of the drive source 300 can be directly rotatably connected to the end position of the third transmission rod 311. However, in this embodiment, a transition connection is added between the first end of the drive source 300 and the end of the third transmission rod 311. Specifically, a transmission member 320 is provided between the first end of the drive source 300 and the third transmission rod 311. The two sides of the transmission member 320 are respectively rotatably connected to the third transmission rod 311 and the first end of the drive source 300. The drive source 300 transmits power to the third transmission rod 311 through the transmission member 320, which can improve the degree of freedom of transmission of the third transmission rod 311, thereby improving the installation flexibility of the drive source 300. When the first end and the second end of the drive source 300 move relative to each other, the transmission member 320 can drive the third transmission rod 311 to rotate, and the relative rotation of the transmission member 320 on the third transmission rod 311 can adapt to the positional changes of the drive source 300 during its movement.

[0074] To facilitate the convenient rotatable connection between the transmission component 320 and the third transmission rod 311, in this embodiment, a transmission pipe 330 is connected to one side of the transmission component 320, and the transmission pipe 330 is rotatably connected to the third transmission rod 311. The transmission pipe 330 is fixed to one side of the transmission component 320, and its end is rotatably connected to the third transmission rod 311, allowing it to rotate relative to the third transmission rod 311. Thus, when the drive source 300 is working, it can drive the transmission component 320 to rotate about the axis of the transmission pipe 330 around the third transmission rod 311. In practical applications, the left and right sides of the movable seat 200 and the left and right sides of the base frame are respectively provided with a first linkage mechanism 210 and a second linkage mechanism 310. At this time, the third transmission rods 311 in the two second linkage mechanisms 310 can be interconnected through transmission bars to jointly drive the linkage mechanisms on their left and right sides.

[0075] When the first transmission angle decreases, the first transmission rod 211 and the second transmission rod 212 approach each other. When the first transmission rod 211 and the second transmission rod 212 approach each other to a certain distance, they will interfere with the transmission tube 330. In order to allow the first transmission rod 211 and the second transmission rod 212 to approach each other further, in this embodiment, a first recess 213 is provided on the top side of the first transmission rod 211. The first recess 213 is used to avoid the transmission tube 330 when it approaches. When the first linkage mechanism 210 is in a folded state, the transmission tube 330 abuts against the first recess 213. When the first transmission rod 211 rotates relative to the second transmission rod 212, the transmission tube 330 enters the first recess 213 on the top side of the first transmission rod 211. When the transmission tube 330 moves into the first recess 213 and abuts against it, the first recess 213 restricts the transmission tube 330 from moving further. At this time, the first transmission rod 211 and the second transmission rod 212 cannot be folded further, and the first transmission angle changes to the minimum. The cooperation between the first recess 213 and the transmission tube 330 helps to stabilize the position of the movable seat 200.

[0076] Similarly, when the second transmission angle decreases, the third transmission rod 311 and the fourth transmission rod 312 approach each other. When the third transmission rod 311 and the fourth transmission rod 312 approach each other to a certain distance, the drive source 300 occupies a certain space in height, which will interfere with the continued rotation of the transmission component 320. Therefore, in this embodiment, a second recess 321 is provided on the top side of the transmission component 320. The second recess 321 is used to avoid the drive source 300 when it is relatively close to it. When the second linkage mechanism 310 is in the folded state, the first end of the drive source 300 abuts against the second recess 321. When the third transmission rod 311 and the fourth transmission rod 312 rotate relative to each other and approach each other, the transmission component 320 rotates and gradually approaches the drive source 300. At this time, the second recess 321 on the transmission component 320 can avoid the end position of the drive source 300, so that the third transmission rod 311 and the fourth transmission rod 312 can be further folded to reduce the second transmission angle. When the end of the drive source 300 moves into the second recess 321 and abuts against it, it will restrict the transmission tube 330 from rotating further. At this time, the third transmission rod 311 and the fourth transmission rod 312 cannot be further folded, and the second transmission angle changes to the minimum. The cooperation between the second recess 321 and the transmission tube 330 is beneficial to stabilizing the position of the movable seat 200.

[0077] In the above embodiment, when the drive source 300 is working, the power is transmitted to the first linkage mechanism 210, which will drive the first linkage mechanism 210 to unfold or fold directly. In order to delay the output of power from the drive source 300 to the first linkage mechanism 210 and realize the phased provision of power, in this embodiment, a first elastic component 350 is connected between the first transmission rod 211 and the base 100. When the first linkage mechanism 210 moves from the folded state to the unfolded state or from the unfolded state to the folded state, the first elastic component 350 first elastically deforms and then elastically recovers. The first elastic component 350 can be a tension spring.

[0078] In this embodiment, the first elastic member 350 can drive the first transmission rod 211 to rotate closer to the second transmission rod 212 or to rotate further away from the second transmission rod 212. When the drive source 300 is working, the first end of the drive source 300 needs to overcome the elastic force of the first elastic member 350. At this time, the first linkage mechanism 210 has not started working, while the second end of the drive source 300 drives the second transmission assembly 520 of the leg bracket 600 to work, so that the leg bracket 600 unfolds from the movable seat 200. As the power provided by the drive source 300 gradually increases, the first transmission rod 211 can be overcome by overcoming the elastic force of the first elastic member 350. After the elastic component 350 exerts its elastic force, it drives the first linkage mechanism 210 from the folded state to the unfolded state. During this process, the rotation of the first transmission rod 211 will cause the first elastic component 350 to first deform elastically. Then, the first transmission rod 211 rotates in the opposite direction, causing the first elastic component 350 to elastically recover. In this way, the first elastic component 350 provides an elastic limiting force to the first linkage mechanism 210, so that the drive source 300 can first drive the components on the movable seat 200, such as the leg bracket 600, to move, and then drive the movable seat 200 to slide on the base 100.

[0079] Furthermore, the maximum elastic force of the first elastic component 350 is less than 500 Newtons. When the first linkage mechanism 210 is in the folded state, the first elastic component 350 is vertically arranged, and the first transmission rod 211 is located below the first elastic component 350. The first elastic component 350 limits the maximum value of the first transmission rod 211 during initial rotation to no more than 500 Newtons. This helps to avoid the situation where the drive source 300 cannot drive the first linkage mechanism 210 to move, ensuring that the drive source 300 can first transmit the power of movement to the leg bracket 600 on the movable seat 200, and then transmit the power of movement to the first linkage mechanism 210 to drive the movable seat 200 to slide on the base 100. Because the first elastic component 350 is vertically arranged, when the first linkage mechanism 210 is in the folded state and the first transmission rod 211 is located below the first elastic component 350, the first transmission rod 211 cannot automatically move the first linkage mechanism 210 from the folded state to the unfolded state under its own weight.

[0080] In order to enable the drive source 300 to control and switch between the leg support 500 and the movable seat 200 through the first transmission component and the second transmission component 520, in this embodiment, the second transmission component 520 is provided with a first limiting component 710, and the movable seat 200 is rotatably connected with a locking component 720 and a second limiting component 730. The second limiting component 730 is used to limit the relative sliding between the base 100 and the movable seat 200. The locking component 720 can be rotatably matched with the first limiting component 710 or the second limiting component 730, wherein the locking component 720 is matched with the first limiting component 710 to limit the movement of the second transmission component 520, or the locking component 720 is matched with the second limiting component 730 to limit the movement of the first transmission component.

[0081] In this embodiment, the locking component 720 can be rotated to engage with the first limiting component 710 or the second limiting component 730. When the locking component 720 engages with the second limiting component 730 and releases the first limiting component 710, the locking component 720 restricts the sliding of the movable seat 200, while the first transmission component can rotate to extend and retract, facilitating the adjustment of the seat frame from a sitting posture to a TV posture. When the locking component 720 engages with the first limiting component 710 and releases the second limiting component 730, the locking component 720 restricts the rotation of the first transmission component, while the movable seat 200 can slide relative to the base 100, facilitating the adjustment of the seat frame from a TV posture to a reclining posture. The seat frame of this application can be adjusted to a sitting posture, a TV posture, or a reclining posture to meet the user's needs for various rest postures.

[0082] In some embodiments, one end of the locking member 720 is used to engage with the first limiting member 710, and the other end of the locking member 720 is used to engage with the second limiting member 730. During the rotation of the locking member 720, one end of the locking member 720 engages with the first limiting member 710 in a manner that contacts the first limiting member 710, and the other end of the locking member 720 engages with the second limiting member 730 in a manner that contacts the second limiting member 730.

[0083] It is understandable that, since the locking component 720 is a rod-shaped structure and its rotation center is located in the middle, the first limiting component 710 can be directly formed on the third connecting rod 523. When one end of the locking component 720 contacts and matches the first limiting component 710, the other end of the locking component 720 moves away from the second limiting component 730, thereby releasing the rotation restriction of the second limiting component 730; conversely, when the other end of the locking component 720 contacts and matches the second limiting component 730, one end of the locking component 720 moves away from the first limiting component 710, thereby releasing the rotation restriction of the first limiting component 710. Therefore, the rotation of the first transmission assembly and the sliding of the movable seat 200 relative to the base 100 are two separate motion processes that cannot occur simultaneously.

[0084] In some embodiments, a snap-fit ​​assembly is provided between the second limiting member 730 and the base 100, the snap-fit ​​assembly being used to restrict the relative sliding between the base 100 and the movable seat 200.

[0085] Furthermore, the snap-fit ​​assembly includes a snap-fit ​​component 740 disposed on the movable seat 200 and a snap-fit ​​groove 731 disposed on the second limiting component 730. When the end of the locking component 720 is matched with the second limiting component 730, the snap-fit ​​component 740 is confined within the snap-fit ​​groove 731. The size of the snap-fit ​​groove 731 corresponds to the size of the snap-fit ​​component 740, facilitating the snap-fit ​​component 740 to be inserted into the snap-fit ​​groove 731.

[0086] Understandably, when the locking component 740 is inserted into the slot 731, the locking assembly can restrict the relative sliding of the movable seat 200 and the base 100, thereby locking the position between the movable seat 200 and the base 100. Understandably, as the second limiting component 730 rotates, the locking component 740 can disengage from the slot 731. At this time, the movable seat 200 and the base 100 can slide relative to each other, facilitating the conversion of the seat frame from a TV position to a reclining position.

[0087] Furthermore, when the snap-fit ​​component 740 is inserted into the slot 731, the second end of the locking component 720 matches the second limiting component 730 to restrict the rotation of the second limiting component 730, thereby keeping the snap-fit ​​component 740 within the range of the slot 731 and realizing position locking between the movable seat 200 and the base 100.

[0088] In some embodiments, the second limiting member 730 includes a first extension 7311 and a second extension 7312, which define the slot 731. It is understood that the first extension 7311 and the second extension 7312 are spaced apart, and the space between the first extension 7311 and the second extension 7312 is the slot 731.

[0089] In some embodiments, a second elastic member 750 is provided between the second limiting member 730 and the movable seat 200. The two ends of the second elastic member 750 are respectively connected to the movable seat 200 and the first extension 7311. When the locking member 740 disengages from the slot 731, the second elastic member 750 can drive the second limiting member 730 to rotate by elastic force. The second elastic member 750 can be a spring.

[0090] Understandably, when the locking member 720 restricts the rotation of the second limiting member 730 and the engaging member 740 is engaged in the slot 731, the second elastic member 750 is in a stretched state. When the locking member 720 releases its restriction on the second limiting member 730, the second elastic member 750 tends to shorten, thereby applying an elastic force to the second limiting member 730. Furthermore, the elastic force drives the second limiting member 730 to rotate, causing the engaging member 740 to gradually disengage from the slot 731. After the engaging member 740 disengages from the slot 731, the engaging assembly releases its position lock on the movable seat 200, allowing the movable seat 200 and the base 100 to slide relative to each other.

[0091] A seating arrangement includes a seat frame as described above, the seat frame having a sitting position, a TV position, and a reclining position. When the seat frame is located between the sitting position and the TV position, the drive source 300 can drive the leg support 500 to extend or retract the movable seat 200 via the second transmission component 520. When the seat frame is located between the TV position and the reclining position, the drive source 300 can drive the movable seat 200 and the leg support 500 to reciprocate synchronously via the first transmission component.

[0092] In this seating arrangement, when the seat frame is in a sitting position or a TV position, the drive source 300 drives the second transmission component 520 to move. The second transmission component 520 drives the leg support 500 to extend or retract the movable seat 200, thereby adjusting the relative position of the leg support 500 and the movable seat 200. When the seat frame is in a TV position or a reclining position, the drive source 300 drives the first transmission component to move. The first transmission component drives the movable seat 200 to reciprocate. At this time, the second transmission component 520 and the leg support 500 located on the movable seat 200 also move synchronously, thereby adjusting the position of the seat frame and the leg support 500 together to switch the overall usage state. In this way, the position of the seat frame and the leg support 500 can be adjusted according to the usage needs, improving the flexibility of position adjustment, reducing the number of drive sources 300, and better controlling the overall production and maintenance costs.

[0093] When the seat frame switches between sitting and TV positions, the angle of the seat cushion remains unchanged, while the leg mechanism drives the leg support 500 to change angle through movement. When the seat frame switches between TV and reclining positions, the angle of the leg support 500 relative to the movable seat 200 remains unchanged, while the seat mechanism drives the movable seat 200 to change angle through movement.

[0094] To enhance the user experience of the seating, a backrest function can be added. Specifically, this invention also includes a backrest support 400, which is rotatably connected to the movable seat 200. The backrest support 400 can rotate downwards away from the movable seat 200 or upwards towards the movable seat 200. When the movable seat 200 is in a seated position, the backrest support 400 rotates upwards towards the movable seat 200, allowing the user to lean against it when sitting on the movable seat 200. When the movable seat 200 is in a reclining position, the backrest support 400 rotates downwards away from the movable seat 200, providing support for the user's head and back when lying down, thereby improving the user experience.

[0095] There are various implementation methods for the structure in which the back support 400 rotates on the movable seat 200. For example, a drive source 300 such as a motor or rotary cylinder can be provided on the movable seat 200 to independently control the relative rotation of the back support 400 on the movable seat 200. Alternatively, a third link 523 mechanism can be provided between the movable seat 200, the back support 400 and the base 100. When the movable seat 200 moves, the back support 400 can be driven to rotate relative to the movable seat 200 through the third link 523 mechanism, thus reducing the need for a drive source 300.

[0096] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A seating frame, characterized in that: include: The chair seat assembly includes a first transmission component and a movable seat (200), wherein the first transmission component is pulsatorically connected to the movable seat (200); The leg support device includes a leg support bracket (500) and a second transmission assembly (520), the second transmission assembly (520) being disposed between the leg support bracket (500) and the movable seat (200); A drive source (300) is connected to the first transmission component and the second transmission component (520). The drive source (300) can drive the leg support (500) to extend or retract the movable seat (200) through the second transmission component (520), or the drive source (300) can drive the movable seat (200) and the leg support (500) to reciprocate synchronously through the first transmission component.

2. A seat frame according to claim 1, characterized in that: It also includes a footrest device, which includes a footrest (600) and a third transmission assembly. The legrest (500) is provided with a rotatable first tooth (511). The third transmission assembly is connected between the footrest (600) and the legrest (500). The third transmission assembly has a second tooth (611). The second tooth (611) can mesh with the first tooth (511). When the second tooth (611) meshes with the first tooth (511) and rotates, it can drive the footrest (600) away from the legrest (500) through the third transmission assembly, or drive the footrest (600) closer to the legrest (500) through the third transmission assembly.

3. A seat frame according to claim 2, characterized in that: The third transmission component includes a transmission block (610) and a first rotating joint (620). The transmission block (610) and the first rotating joint (620) are rotatably mounted on the leg support (500). The transmission block (610) is connected to the first rotating joint (620) in a transmission manner. The second tooth (611) is mounted on the transmission block (610). The foot support (600) is mounted on the first rotating joint (620). The transmission block (610) can drive the first rotating joint (620) to rotate closer to or away from the leg support (500).

4. A seat frame according to claim 3, characterized in that: The first rotating joint (620) includes a first connecting rod (621) and a second connecting rod (622). One end of the first connecting rod (621) is rotatably connected to the leg bracket (500), and the other end of the first connecting rod (621) is rotatably connected to the foot bracket (600). One end of the second connecting rod (622) is eccentrically rotatably connected to the transmission block (610), and the other end of the second connecting rod (622) is rotatably connected to the foot bracket (600).

5. A seat frame according to claim 3, characterized in that: The second tooth (611) includes a plurality of transmission teeth formed on the outside of the transmission block (610), and the plurality of transmission teeth are arranged around the rotation axis of the transmission block (610).

6. A seat frame according to claim 2, characterized in that: A drive block (510) is rotatably connected to the leg bracket (500). The first tooth (511) includes a plurality of drive teeth formed on the outside of the drive block (510), and the drive teeth are arranged around the rotation axis of the drive block (510).

7. A seat frame according to claim 6, characterized in that: The second transmission component (520) is connected to the drive block (510) in a transmission connection. When the second transmission component (520) is active, it can drive the drive block (510) to rotate.

8. A seat frame according to claim 7, characterized in that: The second transmission assembly (520) includes a first connecting rod (521), a second connecting rod (522), and a second rotating joint. One end of the first connecting rod (521) is rotatably connected to the leg bracket (500), and one end of the second connecting rod (522) is eccentrically rotatably connected to the drive block (510). The other ends of the first connecting rod (521) and the other ends of the second connecting rod (522) are respectively connected to the second rotating joint. The drive source (300) is connected to the second rotating joint. The drive source (300) can drive the second rotating joint to rotate relative to or away from the leg bracket (500).

9. A seat frame according to claim 8, characterized in that: The second rotating joint includes a third link (523) and a fourth link (524), which are arranged at intervals. The top ends of the third link (523) and the fourth link (524) are rotatably connected to the movable seat (200), respectively. The bottom end of the third link (523) is rotatably connected to the end of the first link (521) away from the leg bracket (500). The bottom end of the fourth link (524) is rotatably connected to the position of the first link (521) near the third link (523). The bottom end of the fourth link (524) is rotatably connected to the end of the second link (522) away from the drive block (510). The drive source (300) is driven by the third link (523) or the fourth link (524).

10. A seat frame according to claim 1, characterized in that: The chair seat assembly includes a base (100) and the movable seat (200) is slidably connected to the base (100).

11. A seat frame according to claim 10, characterized in that: The first transmission assembly includes a first linkage mechanism (210) and a second linkage mechanism (310) that are connected to each other. The first linkage mechanism (210) is connected between the base (100) and the movable seat (200). The first linkage mechanism (210) has an unfolded or folded state. The second linkage mechanism (310) is connected to the drive source (300), and the base (100) is connected to the first linkage mechanism (210). The second linkage mechanism (310) also has an unfolded or folded state. When the movable seat (200) slides on the base (100), one of the first linkage mechanism (210) and the second linkage mechanism (310) tends to be in an unfolded state, and the other tends to be in a folded state.

12. A seat frame according to claim 11, characterized in that: The drive source (300) has a first end and a second end that can move closer to or further away from each other. The first end of the drive source (300) is driveably connected to the second linkage mechanism (310), and the second end of the drive source (300) is rotatably connected to the movable seat (200).

13. A seat frame according to claim 12, characterized in that: The first linkage mechanism (210) includes a first transmission rod (211) and a second transmission rod (212) rotatably connected to each other. The first transmission rod (211) is rotatably connected to the base (100), and the second transmission rod (212) is rotatably connected to the movable seat (200). The second linkage mechanism (310) is drivenly connected to the second transmission rod (212). When the first transmission rod (211) and the second transmission rod (212) rotate to move away from each other, the first linkage mechanism (210) is in an unfolded state; when the first transmission rod (211) and the second transmission rod (212) rotate to move closer to each other, the first linkage mechanism (210) is in a folded state.

14. A seat frame according to claim 13, characterized in that: The second linkage mechanism (310) includes a third transmission rod (311) and a fourth transmission rod (312) that are rotatably connected to each other. The first end of the second transmission rod (212) and the drive source (300) are respectively rotatably connected to the third transmission rod (311). The fourth transmission rod (312) is rotatably connected to the base (100). When the third transmission rod (311) and the fourth transmission rod (312) rotate to move away from each other, the second linkage mechanism (310) is in an unfolded state. When the third transmission rod (311) and the fourth transmission rod (312) rotate to move closer to each other, the second linkage mechanism (310) is in a folded state.

15. A seat frame according to claim 14, characterized in that: A transmission component (320) is provided between the first end of the drive source (300) and the third transmission rod (311), and the two sides of the transmission component (320) are respectively rotatably connected to the third transmission rod (311) and the first end of the drive source (300).

16. A seat frame according to claim 15, characterized in that: One side of the transmission component (320) is connected to a transmission tube (330), which is rotatably connected to the third transmission rod (311).

17. A seat frame according to claim 16, characterized in that: The first transmission rod (211) has a first recess (213) on its top side. The first recess (213) is used to avoid the transmission tube (330) when it approaches. When the first linkage mechanism (210) is in a folded state, the transmission tube (330) abuts against the first recess (213).

18. A seat frame according to claim 15, characterized in that: The top side of the transmission component (320) is provided with a second recess (321). The second recess (321) is used to avoid the drive source (300) when it is relatively close. When the second linkage mechanism (310) is in the folded state, the first end of the drive source (300) abuts against the second recess (321).

19. A seat frame according to claim 13, characterized in that: A first elastic component (350) is connected between the first transmission rod (211) and the base (100). When the first linkage mechanism (210) moves from a folded state to an unfolded state or from an unfolded state to a folded state, the first elastic component (350) first elastically deforms and then elastically recovers.

20. A seat frame according to claim 19, characterized in that: The maximum elastic force of the first elastic component (350) is less than 500 Newtons; when the first linkage mechanism (210) is in the folded state, the first elastic component (350) is vertically arranged, and the first transmission rod (211) is located below the first elastic component (350).

21. A seat frame according to claim 10, characterized in that: The second transmission assembly (520) is provided with a first limiting component (710). The movable seat (200) is rotatably connected with a locking component (720) and a second limiting component (730). The second limiting component (730) is used to limit the relative sliding between the base (100) and the movable seat (200). The locking component (720) can be rotatably matched with the first limiting component (710) or the second limiting component (730). The locking component (720) is matched with the first limiting component (710) to limit the movement of the second transmission assembly (520), or the locking component (720) is matched with the second limiting component (730) to limit the movement of the first transmission assembly.

22. A seat frame according to claim 21, characterized in that: One end of the locking component (720) is used to match the first limiting component (710), and the other end of the locking component (720) is used to match the second limiting component (730).

23. A seat frame according to claim 22, characterized in that: A snap-fit ​​assembly is provided between the second limiting component (730) and the base (100), the snap-fit ​​assembly being used to restrict the relative sliding between the base (100) and the movable seat (200).

24. A seat frame according to claim 23, characterized in that: The snap-fit ​​assembly includes a snap-fit ​​component (740) disposed on the movable seat (200) and a snap-fit ​​groove (731) disposed on the second limiting component (730). When the end of the locking component (720) is matched with the second limiting component (730), the snap-fit ​​component (740) is confined inside the snap-fit ​​groove (731).

25. A seat frame according to claim 24, characterized in that: The second limiting member (730) includes a first extension (7311) and a second extension (7312), which define the slot (731).

26. A seat frame according to claim 25, characterized in that: A second elastic component (750) is provided between the second limiting component (730) and the movable seat (200). The two ends of the second elastic component (750) are respectively connected to the movable seat (200) and the first extension (7311). When the locking component (740) disengages from the slot (731), the second elastic component (750) can drive the second limiting component (730) to rotate by elastic force.

27. A seating arrangement, characterized in that: The seat includes any one of claims 1 to 26, the seat having a sitting position, a TV position, and a reclining position. When the seat is between the sitting position and the TV position, the drive source (300) can drive the leg support (500) to extend or retract the movable seat (200) via the second transmission component (520). When the seat is between the TV position and the reclining position, the drive source (300) can drive the movable seat (200) and the leg support (500) to reciprocate synchronously via the first transmission component.

28. A seating arrangement according to claim 27, characterized in that: It also includes a back support (400) which is rotatably connected to the movable seat (200). The back support (400) can rotate downward away from the movable seat (200) or rotate upward toward the movable seat.

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