Iron stand floor type seat unit and iron stand floor type seat

Abstract

The utility model relates to an iron stand floor type seat unit which comprises a base unit which is fixedly placed relative to the ground, and the base unit is used for movably supporting the seat unit above the ground; the seat frame can slide relative to the base unit and comprises a pair of seat frame longitudinal beams extending in the front-back direction of the seat unit; the backrest unit is connected to the rear part of the seat frame; and a leg unit capable of sliding relative to the seat frame, wherein the leg unit comprises a leg placing plate and a pair of leg sliding rods. According to the seat frame, the seat frame further comprises a pair of leg sliding rails extending in the front-back direction of the seat unit, the leg sliding rails are fixedly connected with the seat frame longitudinal beams, the leg sliding rods are supported in the leg sliding rails in a sliding mode, and therefore the leg unit can be converted between the retraction position and the stretching position. In addition, the utility model further relates to an iron stand floor type seat.

Description

Technical Field

[0001] The utility model relates to an iron frame floor-standing type seat unit. In addition, the utility model also relates to an iron frame floor-standing type seat comprising the seat unit. Background Art

[0002] In the prior art, a variety of movable seat units are known, such as sofas or seats with multi-position conversion functions. With the improvement of people's living standards, the comfort requirements for sofas and seats are also increasing. In the known design, the movable seat unit is usually equipped with a mechanical extension device, which can be transformed between a sitting position, a leisure position (or a TV position) and a lying position. When the seat unit is transformed from a sitting position to a TV position, the footrest of the seat unit extends forward, and the angle between the backrest and the seat portion remains basically unchanged. When the seat unit is transformed from a TV position to a lying position, the footrest is further forward and upward than the TV position, and the backrest is significantly tilted back. However, in the existing design of movable seats, the leg extension device usually adopts a multi-link telescopic structure, which often brings the disadvantages of complex structure and cumbersome installation process; in addition, due to the complex connection structure, there is also a risk of functional failure. Utility Model Content

[0003] In view of this, the technical problem to be solved by the present invention is to provide a movable seat with a simpler structure, more flexible and convenient operation, and smaller installation space required.

[0004] In order to solve the technical problem, an iron frame floor-standing seat unit is provided, which includes: a base unit fixedly placed relative to the ground, and the seat unit is movably supported above the ground by the base unit; a seat frame slidable relative to the base unit, which includes a pair of seat frame longitudinal beams extending along the front-to-back direction of the seat unit; a backrest unit connected to the rear of the seat frame; and a leg unit slidable relative to the seat frame, which includes a leg rest and a pair of leg sliding rods. According to the utility model, the seat frame also includes a pair of leg slide rails extending along the front-to-back direction of the seat unit, the leg slide rails are fixedly connected to the seat frame longitudinal beams, and the leg sliding rods are slidably supported in the leg slide rails, so that the leg unit can be transformed between a retracted position and an extended position, in which the leg rest is folded at the front end of the leg slide rail in the retracted position, and in the extended position, the leg rest is unfolded forward relative to the leg slide rail.

[0005] Compared with the existing technology, the leg unit abandons the traditional multi-link structure and adopts the matching connection of the leg sliding rod and the leg sliding rail. This simplifies the mechanical connection structure and realizes a simpler motion chain, thereby reducing the risk of motion stagnation and functional impairment; on the other hand, it reduces the requirement for installation height and realizes a more compact seat unit design.

[0006] In a preferred embodiment, the leg unit includes a leg rest connecting rod and a reset member, wherein the leg rest connecting rod is pivotally connected to the leg sliding rod and fixedly connected to the leg rest, and the reset member acts between the leg sliding rod and the leg rest connecting rod, and with the aid of the reset member, the end of the leg rest connecting rod facing away from the leg sliding rod can be flipped forward.

[0007] In this embodiment, during the transformation of the leg unit from the retracted position to the extended position, the leg sliding rod slides forward along the leg sliding rail, and the reset member causes the legrest connecting rod together with the legrest to flip forward.

[0008] In this embodiment, during the process of the leg unit changing from the extended position to the retracted position, the leg sliding rod slides backward along the leg slide rail, so that the leg rest is stopped by the front end of the seat frame, thereby overcoming the restoring force of the restoring member and flipping backward.

[0009] By setting the reset member, the legrest connecting rod is biased, so that the legrest connecting rod and the legrest fixedly attached thereto can flip forward without external force, that is, without being blocked. Thus, the legrest of the leg unit can automatically flip over with the sliding of the legrest connecting rod.

[0010] In a preferred embodiment, the reset element comprises a torsion spring.

[0011] In a preferred embodiment, the leg rail is fixedly connected to the seat frame longitudinal beam in an inclined manner. Thus, the leg sliding rod also lifts upward while sliding forward, which improves the comfort of the user.

[0012] In a preferred embodiment, the leg slide rail is configured as a slide guide member, and the leg slide rod is at least partially slidably engaged in the slide guide member.

[0013] In a preferred embodiment, the backrest unit includes a backrest plate, an active rod, a first driven rod and a backrest mounting rod, wherein the backrest plate is fixedly attached to the backrest mounting rod, the upper end of the first driven rod is pivotally connected to the backrest mounting rod, the lower end of the first driven rod is pivotally connected to the base unit, the lower end of the active rod is pivotally connected to the seat frame, and the upper end of the active rod is pivotally connected to the first driven rod or the backrest mounting rod. Preferably, the backrest unit includes a second driven rod, the upper end of the second driven rod is pivotally connected to the backrest mounting rod, and the lower end of the second driven rod is pivotally connected to the base unit, so that a four-bar linkage is formed by the first driven rod, the backrest mounting rod, the second driven rod and the base unit.

[0014] The seat frame slides forward so that the highest point of the backrest board has a tendency to move downward and forward. It should be noted here that during the entire process of the seat frame sliding forward, the tendency of the highest point of the backrest board to move downward and forward does not exclude the temporary or slight backward movement of the highest point of the backrest board. In this embodiment, as the seat frame moves forward, the lower end of the active rod pivotally connected to the seat frame moves forward, so that the angle between the active rod and the first driven rod and / or the second driven rod increases, and the active member moves forward as a whole with the seat frame, driving the backrest board to move forward while tilting backward, thereby causing the highest point of the backrest board to move downward, and also forward if necessary. This reduces the excessive requirements for the rear placement space of the seat, and achieves a zero-wall design.

[0015] In a preferred embodiment, the seat unit comprises an electric drive unit, which comprises an electric actuator acting between the base unit and the leg unit, by means of which the seat unit can be sequentially changed between a sitting position, a TV position and a lying position. In this embodiment, the electric drive unit realizes the common control of the seat frame, the backrest unit and the leg unit by means of only one actuator.

[0016] Preferably in this embodiment, the leg unit includes a leg beam extending laterally between the pair of leg sliding rods, wherein one end of the electric actuator is connected to the base unit and the other end is connected to the leg beam, and the leg unit and the seat frame are caused to move successively by extension of the electric actuator.

[0017] Preferably, the adjustment stroke achieved by the extension of the electric actuator is divided into two stages implemented successively, in which the leg unit slides relative to the seat frame in the first stage and the seat frame slides relative to the base unit in the second stage. Correspondingly, the adjustment stroke achieved by the contraction of the electric actuator is also divided into two stages implemented successively, in which the seat frame slides relative to the base unit in the first stage and the leg unit slides relative to the seat frame in the second stage.

[0018] Preferably, the seat unit further comprises a sequential element, by which the seat unit can be sequentially changed between a sitting position, a TV position and a lying position. Particularly preferably, the sequential element comprises a sequential spring acting between the base unit and the seat frame.

[0019] In another alternative embodiment, the seat unit comprises an electric drive unit, which comprises a seat frame actuator acting between the base unit and the seat frame and / or a leg actuator acting between the seat frame and the leg unit, by means of which the seat unit can be changed between a sitting position, a TV position and / or a lying position. In this embodiment, the control of the seat frame and the leg unit is implemented independently of each other by different actuators, thereby achieving a more flexible position change.

[0020] In this embodiment, preferably, the seat frame further includes an actuator crossbeam extending transversely between the pair of seat frame longitudinal beams. The seat frame actuator acts between the base unit and the actuator crossbeam, and the seat frame is caused to slide forward and backward relative to the base unit through the extension and contraction of the seat frame actuator. The leg unit includes a leg crossbeam extending transversely between the pair of leg sliding rods, and the leg actuator acts between the actuator crossbeam and the leg crossbeam, and the leg unit is caused to slide forward and backward relative to the seat frame through the extension and contraction of the leg actuator.

[0021] In order to solve the technical problem, a floor-standing iron frame chair is also provided, which includes the above-mentioned seat unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] Figure 1 A perspective view schematically shows a floor-standing iron frame seat unit according to a first embodiment of the present invention, which is in a sitting position;

[0024] Figure 2 Schematically shown Figure 1 A perspective view of the seat unit as viewed obliquely from below;

[0025] Figure 3 Schematically shown Figure 1 a partial perspective view of the seat unit shown;

[0026] Figure 4 Schematically shown Figure 1 a partial perspective view of the seat unit shown;

[0027] Figure 5 Schematically shown Figure 1a side view of the seat unit shown in a sitting position;

[0028] Figure 6 A perspective view schematically shows a floor-standing iron frame seat unit according to a first embodiment of the present invention, which is in a lying position;

[0029] Figure 7 Schematically shown Figure 6 A perspective view of the seat unit as viewed obliquely from below;

[0030] Figure 8 Schematically shown Figure 6 a side view of the seat unit shown in a lying position;

[0031] Fig. 9 A perspective view schematically shows a floor-standing iron frame seat unit according to a second embodiment of the present invention, which is in a sitting position;

[0032] Fig.10 Schematically shown Fig. 9 A perspective view of the seat unit as viewed obliquely from below;

[0033] Fig.11 Schematically shown Fig. 9 a side view of the seat unit shown in a sitting position;

[0034] Fig.12 A perspective view schematically shows a floor-standing iron frame seat unit according to a second embodiment of the present invention, which is in a lying position; and

[0035] Fig.13 Schematically shown Fig.12 A side view of the seat unit is shown in a lying position. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The term "one embodiment" or "embodiment" as referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the utility model. In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0038] In addition, it should be noted that the "front-rear direction" in this application refers to the extension direction of the leg unit of the furniture unit, especially the seat unit. Specifically, "front" refers to the direction toward the leg unit, and "rear" refers to the direction toward the backrest unit. "Left-right direction" or "lateral direction" refers to the direction of the furniture unit, especially the seat unit, which is perpendicular to the "front-rear direction" in the horizontal direction.

[0039] Figures 1 to 8 A floor-standing iron frame seat unit according to a first embodiment of the utility model is schematically shown, wherein the seat unit comprises a base unit 1 fixed relative to the ground, a seat frame 2 slidable relative to the base unit 1, a backrest unit 3 connected to the rear of the seat frame 2, and a leg unit 4 slidable relative to the seat frame 2.

[0040] The seat unit is configured to be able to sequentially switch between a plurality of different positions, such as a sitting position, a TV position, and a lying position. Figure 1 In the exemplary sitting position, the backrest is upright and the leg unit is folded under the seat frame; in the TV position not specifically shown, the leg unit is extended forward; Figure 6 In the exemplary lying position, the leg unit is extended forward, the seat frame slides forward and drives the backrest board to tilt at a larger angle.

[0041] The base unit 1 includes a substantially rectangular base frame 10 and four legs 11 extending downward from the base frame 10, and the base frame 10 together with the entire seat unit is supported on the ground by the legs 11. Of course, in an embodiment not shown, the legs 11 can also be replaced by a rotating bracket for supporting on the ground or two mutually parallel support rails supported on the ground.

[0042] The seat frame 2 is used to attach a seat portion (not specifically shown), and includes two seat frame longitudinal beams 21 extending in parallel along the front-to-back direction of the seat unit, and a seat frame rear cross beam 22 and a seat frame front cross beam 23 transversely connected between the two seat frame longitudinal beams 21. The two seat frame longitudinal beams 21 are respectively slidably matched with two side arms of the base frame of the base unit 1, so that the seat frame 2 can slide forward and backward relative to the base unit 1 along the front-to-back direction of the seat unit.

[0043] The rear portion of the seat frame 2 is connected to a backrest unit 3. The backrest unit 3 includes a backrest plate 30, an active rod 31, a first driven rod 32, a second driven rod 33, and a backrest mounting rod 34. The backrest plate 30 is used to attach a backrest not specifically shown and is fixedly attached to the backrest mounting rod 34.

[0044] The upper end of the first driven rod 32 and the upper end of the second driven rod 33 are respectively pivotally connected to the backrest mounting rod 34, and the lower end of the first driven rod 32 and the lower end of the second driven rod 33 are respectively pivotally connected to the base unit 1. Thus, a four-bar linkage is formed by the first driven rod 32, the backrest mounting rod 34, the second driven rod 33 and the base unit 1. When the four-bar linkage is deformed, the backrest board 30 attached thereto tilts backward or forward.

[0045] The lower end of the active rod 31 is pivotally connected to the seat frame 2, and the upper end of the active rod 31 is pivotally connected to the first driven rod 32 or the second driven rod 33 or the backrest mounting rod 34. When the seat frame 2 slides forward relative to the base unit 1, the lower end of the active rod 31 is also moved forward, wherein the angle between the active rod 31 and the first driven rod 32 and / or the second driven rod 33 increases, and the active member 31 moves forward as a whole with the seat frame 2, driving the backrest board 30 to move forward while tilting backward, so that the highest point of the backrest board 30 moves downward, and also moves forward when necessary.

[0046] The front part of the seat frame 2 is provided with a leg unit 4. The leg unit 4 includes a leg rest plate 40, a pair of leg sliding rods 41, a leg rest plate connecting rod 42, a leg cross beam 43 and a reset member 44.

[0047] Especially Figure 2 , Figure 3 and Figure 4As shown, the seat frame 2 includes a leg slide rail 24 for cooperating with the leg slide rod 41, and the leg slide rail 24 is fixedly connected to the seat frame longitudinal beam 21. The leg slide rail 24 is configured as a slide channel member, which extends substantially along the front-rear direction of the seat unit and is inclined relative to the seat frame longitudinal beam 21, thereby forming an angle with the seat frame longitudinal beam 21.

[0048] The legrest 40 is generally constructed as a plate-like member extending over at least a portion of the lateral width of the seat unit, and is used for attaching a footrest (not shown) of the seat unit.

[0049] The leg slide rod 41 is embedded in the leg slide rail 24 at its rear portion and can slide along the leg slide rail 24 .

[0050] The legrest connecting rod 42 is constructed to have an L-shaped cross-section, one side of which is pivotally connected to the leg sliding rod 41, and the other side is fixedly connected to the legrest 40, for example, fixedly connected to the legrest 40 by riveting, threading, welding, etc.

[0051] The leg cross beam 43 extends transversely between the two leg sliding rods 41 , thereby ensuring the movement synchronization of the leg units 4 .

[0052] The reset member 44 is configured as a torsion spring in this embodiment, which acts between the leg sliding rod 41 and the legrest connecting rod 42. Under the biasing effect of the reset member 44, the legrest connecting rod 42 tends to flip forward with its end away from the leg sliding rod 41.

[0053] In such Figures 1 to 5 In the sitting position of the seat unit shown in FIG. 1 , the leg unit 4 is in the retracted position, and the leg rest 40 is folded at the front end of the leg rail 24, wherein the inner side of the leg rest 40 abuts against the front end of the leg rail 24, thereby overcoming the restoring force applied by the restoring member 44 and maintaining its retracted position. Figures 5 to 8 In the lying position of the seat unit shown and the TV position not shown, the leg unit 4 is in the extended position, wherein the leg rest 40 is unfolded forward relative to the leg slide rail 24, wherein the leg sliding rod 41 slides forward, so that the leg rest 40 and the leg rest connecting rod 42 attached thereto are disengaged from the stopper of the leg slide rail 24, and the leg rest connecting rod 42 is flipped forward with its end away from the leg sliding rod 41 under the biasing action of the reset member 44, thereby driving the leg rest 40 to flip.

[0054] On the contrary, when the seat unit is changed from its lying position to its sitting position, the leg unit 4 is retracted, during which the leg sliding rod 41 moves backward, driving the legrest connecting rod 42 to slide backward together with the legrest 40. When the legrest 40 abuts against the front end of the leg slide rail 24 with its inner side, the legrest 40 overcomes the restoring force of the restoring member 44 and flips downward, thereby changing to its retracted position.

[0055] The seat unit also includes an electric drive unit 5. Figures 1 to 8 In the illustrated embodiment, the electric drive unit 5 comprises an electric actuator 50 acting between the base unit 1 and the leg unit 4 .

[0056] Especially Figure 2 As shown, the electric actuator 50 is constructed as a linear actuator, which includes a motor head 501 and an actuating rod 502 that is retractable relative to the motor head. The motor head 501 is installed at the rear of the base frame 10, for example, it can be installed on the rear cross beam of the base frame 10, or it can be installed on the back plate of the seat unit that is fixed relative to the base frame 10; the actuating rod 502 acts on the leg cross beam 43.

[0057] The adjustment stroke of the electric actuator 50 is divided into two stages which are performed successively.

[0058] For example, in the seat unit from Figure 5 The sitting position shown changes to Figure 8 During the process of changing from the reclining position shown in the figure, the electric actuator 50 is extended. In the first stage, due to the weight of the user sitting on the seat, the seat frame 2 basically maintains the same position relative to the base unit 1, and the posture of the backrest unit also remains basically unchanged. The actuating rod 502 only pushes the leg cross beam 43 to move forward, and then the leg sliding rod 41 slides forward along the leg slide rail 24, and drives the legrest connecting rod 42 and the legrest 40 attached thereto to move forward. Since the leg slide rail 24 is tilted relative to the seat frame longitudinal beam 21, the legrest 40 is also lifted upward while moving forward. In addition, during the process of the leg unit 4 sliding forward, as the stop between the legrest 40 and the leg slide rail 24 is released, the legrest 40 is also flipped forward under the action of the reset member 44, thereby realizing the unfolded position of the leg unit 4. Thereby, the seat unit is transformed from the sitting position to the TV posture position.

[0059] In the second stage, the electric actuator 50 continues to extend until the leg unit 4 is fully extended, and then the leg unit drives the seat frame 2 to slide forward relative to the base frame 10. At the same time, the lower end of the active member 31 of the backrest unit 3 moves forward with the seat frame 2, and drives the four-bar linkage mechanism composed of the first driven rod 32, the backrest mounting rod 34, the second driven rod 33 and the base unit 1 to deform, and the backrest board 30 attached thereto moves forward while reclining, so that the highest point of the backrest board 30 moves downward, and also moves forward when necessary, so that the seat unit can be moved from the TV posture position to the TV posture position. Figure 8 Variations of the lying position shown.

[0060] The corresponding reverse position change of the seat unit is achieved by contracting the electric actuator 50, and the adjustment stroke achieved thereby is also divided into two stages implemented successively, in which the seat frame 2 slides relative to the base unit 1 in the first stage, and in the second stage, the leg unit 4 slides relative to the seat frame 2. No further details will be given here.

[0061] To further ensure the sequential change of the seat unit between various postures, a sequential element 6 is also provided. In this embodiment, the sequential element is constructed as a sequential spring acting between the base unit 1 and the seat frame 2, one end of which is connected to the inner side of the connecting strip fixedly connected to the seat frame longitudinal beam 21, and the other end is connected to the base frame 10. The sequential spring more reliably ensures the sequential change of the seat unit between the sitting position, the TV position and the lying position, and prevents the disorder of the posture change order.

[0062] Figures 9 to 13 A floor-standing iron frame seating unit according to a second embodiment of the present invention is schematically shown, and the seating unit is constructed to be able to be transformed between a plurality of different positions, such as a sitting position, a TV position, and a lying position.

[0063] and Figures 1 to 8 Different from the embodiment shown, the electric drive unit 5 of the seat unit of the second embodiment comprises a seat frame actuator 51 acting between the base unit 1 and the seat frame 2 and a leg actuator 52 acting between the seat frame 2 and the leg unit 4. With the electric drive unit 5, the seat unit can be changed between a sitting position, a TV position and a lying position.

[0064] The seat frame actuator 51 and the leg unit actuator 52 can be operated independently of each other, so that the front-rear sliding movement of the seat frame 2 and the front-rear sliding movement of the leg unit 4 can be implemented independently of each other.

[0065] However, the present invention is not limited thereto. In other embodiments not shown, the electric drive unit may also only include the seat frame actuator 51 or the leg actuator 52, and accordingly, the movable seat may also only be changed between the sitting position and the TV position or only between the sitting position and the lying position.

[0066] like Fig.10 and Fig.11 As shown, the seat frame 2 includes two seat frame longitudinal beams 21, a seat frame rear cross beam 22 and a seat frame front cross beam 23. In addition, the seat frame 2 also includes an actuator cross beam 25 extending transversely between the seat frame longitudinal beams 21. The seat frame actuator 51 is configured as a linear actuator, the motor head of which is mounted on the rear of the base frame 10, and the telescopic actuator rod acts on the actuator cross beam 25. The leg actuator 52 can also be configured as a linear actuator, the motor head of which is mounted on the actuator cross beam 25, and the actuator rod acts on the leg cross beam 43.

[0067] Alternatively, the specific arrangement of the electric drive unit 5 can be adjusted as needed. For example, the seat frame actuator 51 acts between the base unit 1 and the seat frame rear cross beam 22, and the leg actuator 52 acts between the seat frame rear cross beam 22 and the leg cross beam 43; or the seat frame actuator 51 acts between the base unit 1 and the seat frame rear cross beam 22, and the leg actuator 52 acts between the actuator cross beam 25 and the leg cross beam 43.

[0068] Fig.10 The seat unit is shown in a sitting position, wherein the backrest plate 30 is upright and the leg unit 4 is in its retracted position. If only the leg actuator 52 is extended, the leg cross beam 43 is pushed forward and the leg unit 4 is driven to change from its retracted position to its extended position. At this time, the backrest unit 3 maintains its position unchanged, so that the TV posture position of the seat unit is achieved as a whole.

[0069] Starting from the TV posture position, if the seat frame actuator 51 is extended, the seat frame 2 is pushed to slide forward as a whole. At the same time, the lower end of the active member 31 of the backrest unit 3 moves forward with the seat frame 2, and drives the four-bar linkage composed of the first driven rod 32, the backrest mounting rod 34, the second driven rod 33 and the base unit 1 to deform, and the backrest board 30 attached thereto moves forward while reclining, so that the seat unit is moved from the TV posture position to the TV posture position. Fig.12 and 13 Variations of the lying position shown

[0070] Of course, you can also Fig. 9 The sitting position shown initially extends only the seat frame actuator 51, thereby causing the seat frame 2 to slide forward and the backrest to tilt, while the leg unit 4 remains in its retracted position.

[0071] The corresponding reverse position change of the seat unit is achieved by contracting the actuating rod of the actuator, which will not be described in detail here.

Claims

1. A floor-standing iron frame seat unit, characterized in that: It includes: A base unit fixedly placed relative to the ground, the seat unit being movably supported above the ground by the base unit; a seat frame slidably movable relative to the base unit, comprising a pair of seat frame longitudinal beams extending in a front-to-rear direction of the seat unit; a backrest unit connected to a rear portion of the seat frame; and a leg unit slidable relative to the seat frame, comprising a leg rest and a pair of leg sliding rods, In which, the seat frame also includes a pair of leg slides extending along the front and rear directions of the seat unit, the leg slides are fixedly connected to the seat frame longitudinal beams, and the leg sliding rods are slidably supported in the leg slides, so that the leg unit can be transformed between a retracted position and an extended position. In the retracted position, the leg rest is folded at the front end of the leg slides, and in the extended position, the leg rest is unfolded forward relative to the leg slides.

2. The seat unit according to claim 1, characterized in that The leg unit includes a legrest connecting rod and a reset member, wherein the legrest connecting rod is pivotally connected to the leg sliding rod and fixedly connected to the legrest, and the reset member acts between the leg sliding rod and the legrest connecting rod, and with the help of the reset member, the legrest connecting rod can be flipped forward away from the end of the leg sliding rod.

3. The seat unit according to claim 2, characterized in that During the transformation of the leg unit from the retracted position to the extended position, the leg sliding rod slides forward along the leg sliding rail, and the restoring member causes the legrest connecting rod together with the legrest to flip forward.

4. The seating unit according to claim 2, wherein: During the process of the leg unit changing from the extended position to the retracted position, the leg sliding rod slides backward along the leg sliding rail, so that the leg rest is stopped by the front end of the seat frame, thereby overcoming the restoring force of the restoring member and flipping backward.

5. The seating unit according to claim 2, wherein: The reset element comprises a torsion spring.

6. The seating unit according to claim 1, wherein: The leg slide rail and the seat frame longitudinal beam are fixedly connected to each other in an inclined manner.

7. The seating unit according to claim 1, wherein: The leg slide rail is configured as a slide channel member, and the leg slide rod is at least partially slidably engaged in the slide channel member.

8. The seating unit of claim 1, wherein: The backrest unit includes a backrest plate, an active rod, a first driven rod and a backrest mounting rod, wherein the backrest plate is fixedly attached to the backrest mounting rod, the upper end of the first driven rod is pivotally connected to the backrest mounting rod, the lower end of the first driven rod is pivotally connected to the base unit, the lower end of the active rod is pivotally connected to the seat frame, and the upper end of the active rod is pivotally connected to the first driven rod or the backrest mounting rod.

9. The seating unit according to claim 8, characterized in that The backrest unit includes a second follower rod, the upper end of which is pivotally connected to the backrest mounting rod, and the lower end of which is pivotally connected to the base unit, so that a four-bar linkage is formed by the first follower rod, the backrest mounting rod, the second follower rod and the base unit.

10. The seating unit of claim 8, wherein: The seat frame slides forward so that the highest point of the backrest plate tends to move downward and forward.

11. The seating unit of claim 8, wherein: The seat unit comprises an electric drive unit, which comprises an electric actuator acting between the base unit and the leg unit, by means of which the seat unit can be sequentially changed between a sitting position, a TV position and a lying position.

12. The seating unit of claim 11, wherein: The leg unit includes a leg beam extending laterally between the pair of leg sliding rods, wherein one end of the electric actuator is connected to the base unit and the other end is connected to the leg beam, and the extension of the electric actuator causes the leg unit and the seat frame to move in sequence.

13. The seating unit of claim 12, wherein: The adjustment stroke achieved by the extension of the electric actuator is divided into two stages which are implemented successively. In the first stage, the leg unit slides relative to the seat frame, and in the second stage, the seat frame slides relative to the base unit.

14. The seating unit of claim 11, wherein: The seat unit further comprises a sequential element, by means of which the seat unit can be sequentially transformed between a sitting position, a TV position and a lying position.

15. The seating unit of claim 14, wherein: The sequence element comprises a sequence spring acting between the base unit and the seat frame.

16. The seating unit of claim 1, wherein: The seat unit comprises an electric drive unit, which includes a seat frame actuator acting between the base unit and the seat frame and / or a leg actuator acting between the seat frame and the leg unit. With the help of the electric drive unit, the seat unit can be transformed between a sitting position, a TV position and / or a lying position.

17. The seating unit of claim 16, wherein: The seat frame also includes an actuator beam extending transversely between a pair of the seat frame longitudinal beams.

18. The seating unit of claim 17, wherein: The seat frame actuator acts between the base unit and the actuator cross beam, and the seat frame is caused to slide forward and backward relative to the base unit through the extension and contraction of the seat frame actuator.

19. The seating unit of claim 17, wherein: The leg unit includes a leg beam extending transversely between the pair of leg sliding rods, and the leg actuator acts between the actuator beam and the leg beam, and the leg unit is caused to slide forward and backward relative to the seat frame through the extension and contraction of the leg actuator.

20. A floor-standing iron frame chair, characterized in that: It comprises the seating unit according to any one of claims 1 to 19.

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