Leg assembly for seat unit and seat unit

Abstract

The utility model relates to a leg component for a seat unit. The leg component at least comprises a pair of leg longitudinal beams and a pair of leg longitudinal beams, the pair of leg sliding rods can slide relative to the leg longitudinal beams; the leg rest plate is pivotally connected with the front end of the leg sliding rod, the reset device comprises a winding roller and a curtain, on one hand, the reset device is fixedly connected relative to the leg longitudinal beam, on the other hand, the reset device is fixedly connected on the inner side of the leg rest plate, and on the other hand, the reset device is fixedly connected relative to the leg longitudinal beam. The leg assembly can be converted between a retraction position and an extension position, and in the process that the leg assembly is converted from the retraction position to the extension position, the curtain overcomes reset force to be unfolded outwards from the winding roller so as to cover a leg sliding rod extending forwards from a leg longitudinal beam; and in the process that the leg assembly is converted from the stretching position to the retracting position, the curtain retracts into the winding roller under the action of reset force. In addition, the utility model further comprises a seat unit.

Description

Technical Field

[0001] The utility model relates to a leg assembly for a seat unit, and to a seat unit including the leg assembly. Background Art

[0002] In the prior art, a variety of movable seat units are known, such as sofas or seats with multi-position transformation functions. With the improvement of people's living standards, the requirements for the safety of sofas and seats are also increasing day by day. In known designs, movable seat units usually have mechanical extension devices, whereby they can be transformed between a sitting position, a leisure position (or TV position), and a lying position. When the seat unit is transformed from the sitting position to the TV position, the footrest of the seat unit extends forward, and the angle between the backrest and the seat part remains basically unchanged. When the seat unit is transformed from the TV position to the lying position, the footrest further extends forward and upward compared to the TV position, and the backrest significantly reclines. During the above posture transformation process, the internal components of the mechanical extension device, such as linkages, drivers, etc., will be exposed due to the outward extension of the footrest. This will lead to the risk of users being pinched or foreign objects falling into the interior of the seat unit.

[0003] To this end, various methods have been adopted in the seat units of the existing designs to avoid the above risks. For example, a rigid baffle is provided in the moving area of the leg unit, aiming to enclose the space area occupied by the leg unit in the TV position or the lying position. However, due to the limitations of the material properties of the rigid baffle, it cannot flexibly and completely cover the gaps exposed by the leg unit. In addition, for example, a covering material is completely provided from the outside of the seat unit. However, this design method is not advantageous in terms of material cost, and it cannot be widely applied to various types of seat units. Summary of the Utility Model

[0004] In view of this, the technical problem to be solved by the present utility model is to provide a movable seat with a simpler structure and easier assembly.

[0005] To solve the above technical problem, a leg assembly for a seat unit is provided, which at least includes:

[0006] - A pair of leg longitudinal beams extending in the front-back direction of the seat unit;

[0007] - A pair of leg sliding rods slidable relative to the leg longitudinal beams in the front-back direction of the seat unit;

[0008] - A leg rest plate pivotally connected to the front end of the leg sliding rod, and

[0009] - A reset device, which includes a retraction roller and a curtain that is retractably reset and accommodated in the retraction roller, wherein the reset device is fixedly connected to the leg longitudinal beam on the one hand and fixedly connected to the leg rest plate on the other hand.

[0010] Wherein, the leg assembly can be transformed between a retracted position and an extended position. In the retracted position, the leg sliding rod is retracted into the leg longitudinal beam; in the extended position, the leg sliding rod extends forward from the leg longitudinal beam.

[0011] During the process of the leg assembly transforming from the retracted position to the extended position, the curtain unfolds outward from the retraction roller against the reset force, so as to cover the leg sliding rod that extends forward from the leg longitudinal beam; and during the process of the leg assembly transforming from the extended position to the retracted position, the curtain retracts into the retraction roller under the action of the reset force.

[0012] Preferably, the reset device is fixedly connected to the leg longitudinal beam on the one hand and fixedly connected to the inner side of the leg rest plate on the other hand. During the process of the leg assembly transforming from the retracted position to the extended position, the curtain exerts a pulling force on the leg rest plate, so as to cause the leg rest plate to unfold forward relative to the leg longitudinal beam.

[0013] According to the present invention, the curtain of the reset device is retractably reset and accommodated in the retraction roller, which means that the reset device has a reset tendency to automatically retract the curtain into the retraction roller. This reset tendency can be achieved by various known principles, such as by means of a reset spring. When the curtain unfolds outward from the retraction roller, the curtain is tightened under the stress caused by the reset force, so as to exert a pulling force for relative movement on both ends of the reset device, that is, one end fixedly connected to the leg longitudinal beam and the other end fixedly connected to the inner side of the leg rest plate. Thus, while the curtain unfolds itself, it prompts the leg rest plate to flip forward.

[0014] This not only uses the curtain to block the leg sliding rod that extends forward from the leg longitudinal beam, avoiding the risk of the internal space being exposed and foreign objects falling into it, but also gradually flips the leg rest plate through the resulting pulling force, thereby improving the use comfort.

[0015] In a preferred embodiment, during the process of the leg assembly transforming from the extended position to the retracted position, the curtain retracts into the retraction roller under the action of the reset force.

[0016] Conversely to the transformation process from the retracted position to the extended position, when the leg sliding rod retracts into the leg longitudinal beam, the reset force applied by the reset device gradually decreases, so as to allow the leg rest plate to gradually reset and flip until the inner side of the leg rest plate abuts against the front end of the leg longitudinal beam.

[0017] In a preferred embodiment, the leg assembly includes a leg rest link that is pivotally connected to the front end of the leg slide bar and fixedly connected to the leg rest, so that the leg rest is pivotally connected to the leg slide bar about a pivot axis by means of the leg rest link. The take-up roller is fixedly connected at a position relative to the leg longitudinal beam, and the free end of the curtain is fixedly connected to the inner side of the leg rest at a curtain fixing point.

[0018] However, in an alternative embodiment, it is also conceivable that the free end of the curtain is fixedly connected at a position relative to the leg longitudinal beam, and the take-up roller is fixedly connected to the inner side of the leg rest.

[0019] In a preferred embodiment, during the transformation of the leg assembly between the retracted position and the extended position, the curtain fixing point is always located above the pivot axis. Preferably, in the extended position of the leg assembly, the distance between the curtain fixing point and the take-up roller is less than the distance between the pivot axis and the take-up roller. Thus, taking the pivot axis as the fulcrum, the pulling force exerted at the fixing point of the curtain on the inner side of the leg rest forms a greater moment, so as to more effectively lift the end of the leg rest away from the curtain fixing point with reference to the pivot axis upward, thereby realizing the forward flipping of the leg rest.

[0020] In a preferred embodiment, the width of the curtain is not less than the distance between the pair of leg longitudinal beams. Thus, the curtain at least covers the gap in front of the leg longitudinal beams, preventing foreign objects from falling in or causing pinching to the user.

[0021] In a preferred embodiment, the leg longitudinal beam includes a guide rail extending in the front-back direction of the seat unit.

[0022] In an alternative embodiment, the leg longitudinal beam includes a guide groove extending in the front-back direction of the seat unit.

[0023] Accordingly, the adaptation structure of the leg slide bar can be adjusted according to the structure of the leg longitudinal beam. For example, when the leg longitudinal beam includes a guide rail, the leg longitudinal beam may include a slider adapted thereto; when the leg longitudinal beam includes a guide groove, the leg longitudinal beam may additionally include a roller or a pin adapted to the guide groove.

[0024] In a preferred embodiment, the retraction roller includes at least one retraction roller fixing member, and at least one curtain fixing member is provided at the free end of the curtain. Preferably, one retraction roller fixing member can be respectively provided at each of the two ends of the retraction roller along the transverse direction of the seat unit, and one curtain fixing member is provided at the center of the free end of the curtain. The retraction fixing member and the curtain fixing member can be realized in various ways, such as an eyelet through which a hook can pass, a tab with a hole through which a pin or rivet can pass, a threaded hole that can be connected in cooperation with a bolt, etc. Of course, connection methods such as bonding and welding can also be considered.

[0025] In a preferred embodiment, the curtain is made of a flexible material. Thus, the curtain can not only be conveniently accommodated, such as wound around the retraction roller, but also can better match various types of seat units with better applicability.

[0026] To solve the above technical problems, the present utility model also relates to a seat unit, which at least includes:

[0027] - A seat part unit, which includes a seat frame for attaching a seat part; and

[0028] - The leg assembly according to any one of the above claims.

[0029] Of course, the seat unit can also include a backrest unit and an optional base unit.

[0030] In a preferred embodiment, the leg longitudinal beam is directly or indirectly fixedly connected to the seat frame.

[0031] In a preferred embodiment, the reset device is fixedly connected to the front end of the leg longitudinal beam on the one hand and fixedly connected to the leg rest on the other hand.

[0032] In a preferred embodiment, the reset device is fixedly connected to the bottom side of the seat frame on the one hand and fixedly connected to the leg rest on the other hand. Description of the Drawings

[0033] The embodiments of the present utility model are elaborated in detail below with the aid of the drawings.

[0034] Figure 1 Schematically showing a partial perspective view of a seat unit according to an embodiment of the present utility model, with its leg assembly in the retracted position;

[0035] Figure 2 Schematically showing Figure 1 A partial perspective view of the shown seat unit, with its leg assembly in the extended position;

[0036] Figure 3 Schematically showingFigure 1 Perspective view of the reset device of the seat unit shown, wherein the curtain is retracted in the take-up roller;

[0037] Figure 4 Schematically show Figure 3 Perspective view of the reset device shown, wherein the curtain is deployed outward from the take-up roller;

[0038] Figure 5 Schematically show another partial perspective view of the seat unit according to the present invention as viewed obliquely from below, with its leg assembly in the extended position;

[0039] Figure 6 Schematically show as viewed obliquely from above Figure 5 the seat unit shown;

[0040] Figure 7 Schematically show Figure 5 side view of the seat unit shown; and

[0041] Figure 8 Schematically show Figure 7 partial enlarged view of the seat unit shown. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] As used herein, the term "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present utility model. In the description of the present 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 drawings, and is only for the convenience of describing the present 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 should not be construed as a limitation on the present 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.

[0044] In addition, it should be noted here that the "front-rear direction" referred to in this application is with respect to the extension direction of the seat unit, especially the leg assembly of the seat unit. Specifically, "front" refers to the direction towards the leg assembly, and "rear" refers to the direction towards the backrest unit. The "left-right direction" or "lateral direction" or "side direction" is with respect to the direction perpendicular to the "front-rear direction" of the seat unit in the horizontal direction.

[0045] Figure 1 , Figure 2 and Figures 5 to 7 Exemplarily shown is a seat unit according to an embodiment of the present utility model. As Figure 1 shown, the seat unit includes a base unit 1, a seat unit 2, a backrest unit 3, a leg assembly 4, and a leg actuator 47.

[0046] The seat unit may be an armrest floor-standing seat unit. Correspondingly, the base unit 1 has a pair of fixing plates 12 longitudinally extending along the front-rear direction of the seat unit, a rear base cross beam 13 and a front base cross beam 14 extending laterally between the two fixing plates 12. In Figure 1For the sake of simplicity, one of the fixing plates 12 on one side is omitted, and only one fixing plate 12 is shown. The fixing plate 12 is fixedly connected, for example, by riveting, threaded connection or the like, to the inner side of the armrest mounting plate fixedly connected to the armrest portion of the seat unit, and the fixing plate 12 is fixedly connected to the rear base cross beam 13 and the front base cross beam 14 respectively. To further improve the stability of the base unit 1, a front base cross beam 14 is also provided at the front part of the fixing plate 12, and the front base cross beam 14 extends transversely between the fixing plates 12 and is fixedly connected thereto. Here, the fixing plate 12, the connecting strip 11, the rear base cross beam 13, and the front base cross beam 14 are, for example, independent components that can be fixedly connected separately, however, two or more of the fixing plate 12, the rear base cross beam 13, and the front base cross beam 14 can also be constructed as an integral component.

[0047] However, alternatively, in an embodiment not shown, the base unit 1 can also have other structures, for example, a base unit constructed as a floor-standing iron frame, whose fixing plate 12 is not fixedly attached to the inner side of the armrest portion, but there are a plurality of legs extending downward from the fixing plate 12 for supporting on the ground; or the base unit does not have a fixing plate 12, but includes a rotating bracket rotatably supported on the ground.

[0048] The seat unit 2 includes a pair of seat bearing assemblies that can move relative to the base unit 1 in the front-back direction of the seat unit. The seat bearing assembly includes an upper seat longitudinal beam 21, a lower seat longitudinal beam 24, a front seat link 22 and a rear seat link 23 fixedly connected to the upper seat longitudinal beam 21 and the lower seat longitudinal beam 24 respectively. Among them, the rear part of the upper seat longitudinal beam 21 includes two upwardly directed protruding portions, namely a front seat frame protruding portion 21a and a rear seat frame protruding portion 21b. Thus, a frame structure with stable shape is formed.

[0049] As Figure 5 and Figure 6 shown, the top side of the upper seat longitudinal beam 21 is fixedly connected to the seat frame 20, where the seat frame 20 is attached to a seat portion not shown. The seat unit 2 is movably connected to the base unit 1 by means of a linkage mechanism. However, in an alternative embodiment, the seat unit 2 can also be constructed to maintain a constant relative position with respect to the base unit 1.

[0050] The backrest unit 3 is configured to mount a backrest of the seat unit not specifically shown.

[0051] Preferably, the backrest unit 3 is configured to be movable relative to the seat unit 2; however, in an embodiment not shown, the backrest unit 3 can also be constructed to maintain a constant relative position with respect to the seat unit 2.

[0052] Preferably, the backrest unit 3 includes a backrest bracket 31, a first backrest link 32, and a second backrest link 33. The backrest bracket 31 is generally L-shaped and can be pivotally connected relative to the longitudinal beam 21 of the upper seat frame. Among them, the front end of the backrest bracket 31 is pivotally connected to the protruding portion 21a of the front seat frame; the second backrest link 33 is configured as a crank member and includes three pivot points, that is, a pivot point located in the middle of the crank member and two pivot points respectively located at the two ends of the crank member. Thus, the upper end of the second backrest link 33 is pivotally connected to the lower end of the first backrest link 32, the upper end of the first backrest link 32 is pivotally connected to the middle of the backrest bracket 31, and the second backrest link 33 is pivotally connected to the protruding portion 21b of the rear seat frame by means of the pivot point in the middle thereof. In addition, the backrest unit 3 further includes an auxiliary backrest link 34, one end of which is connected to the lower end of the second backrest link 33, and the other end is pivotally connected to the base unit 1.

[0053] In this embodiment, when the seat unit 2 moves in the front-back direction of the seat unit, the backrest bracket 31 reclines and tilts forward accordingly.

[0054] According to the present invention, the leg assembly 4 includes a pair of leg longitudinal beams 40, a leg cross beam 41 horizontally connected between the leg longitudinal beams 40, a pair of leg sliding rods 42, and a leg rest plate 43 connected to the leg sliding rods. Among them, the leg sliding rods 42 cooperate with the leg longitudinal beams 40 in a slidable guiding manner, so that the leg sliding rods 42 can drive the leg rest plate 43 to move along the leg longitudinal beams 40 in the front-back direction of the seat unit.

[0055] The slidable guiding between the leg longitudinal beams 40 and the leg sliding rods 42 can be achieved in various ways.

[0056] Preferably, the leg longitudinal beams 40 are configured as slide rail members, where the leg longitudinal beams 40 include guide rails with a C-shaped cross-section; correspondingly, the leg sliding rods 42 include sliders at their rear ends, so that the leg sliding rods 42 are fittingly and movably engaged in the guide rails of the leg longitudinal beams 40, thereby realizing the slidable guiding of the leg sliding rods 42 in the leg longitudinal beams 40, and thus realizing the transformation of the leg assembly 4 between the retracted position and the extended position.

[0057] The leg longitudinal beams 40 include at least two mounting tabs, that is, a front mounting tab 48a and a rear mounting tab 48b respectively located at their front ends and rear ends. In this embodiment, the mounting tabs are respectively configured as bent members protruding inward from the front ends and rear ends of the leg longitudinal beams 40, and are provided with rivet holes or threaded holes through which rivets or bolts can pass. The front mounting tab 48a and the rear mounting tab 48b jointly define a mounting plane, and the leg assembly 4 is fixedly mounted on the bottom side of the seat frame 20 from below the seat unit by using this mounting plane.

[0058] The leg rest plate 43 is generally configured as a plate member extending across at least part of the lateral width of the seat unit. The leg sliding rod 42 has its rear end slidably inserted into the leg longitudinal beam 40 and its front end connected to the leg rest plate 43. Preferably, the leg sliding rod 42 is connected to the leg rest plate 43 by means of a leg rest plate link 45 arranged at its front end. In particular, as Figure 8 shown, the leg rest plate link 45 is configured to have an L-shaped cross-section, with one side pivotally connected to the leg sliding rod 42 and the other side fixedly connected to the leg rest plate 43, so that the leg rest plate 43 can pivot relative to the leg sliding rod 42 about the pivot axis 45a.

[0059] To achieve the movement synchronization of the leg sliding rods 42, a guiding cross beam 44 is transversely connected between the leg sliding rods 42. Preferably, the connection between the leg sliding rods 42 and the guiding cross beam 44 is achieved by welding, riveting, threaded connection, etc. The guiding cross beam 44 is located in front of the leg cross beam 41.

[0060] The leg assembly 4 can transform between Figure 1 the retracted position shown in Figure 2 and the extended position shown in

[0061] In the retracted position, the leg sliding rods 42 are retracted into the leg longitudinal beams 40, and the leg rest plate 43 is folded up at the front end of the leg longitudinal beams 40; in the extended position, the leg sliding rods 42 project forward from the leg longitudinal beams 40, and the leg rest plate 43 unfolds forward relative to the leg longitudinal beams 40.

[0062] In the reset device 7 as shown in Figure 3 , the curtain 71 is retractably received in the retractable roller 70, wherein a curtain fixing member 73 provided at the free end of the curtain 71 projects from the retractable roller 70; in the reset device 7 as shown in Figure 4 , the curtain 71 is pulled out from the retractable roller 70.

[0063] The reset device 7 is arranged between a pair of leg longitudinal beams 40 of the leg assembly 4, wherein the width of the curtain 71 is at least not less than the distance between the leg longitudinal beams 40.

[0064] In particular, asFigure 5 and Figure 6 As shown in Figure 5 and Figure 6 , the take-up roller 70 of the reset device 7 is fixedly connected to the front mounting tab 48a at the front end of the leg longitudinal beam 40 by its two take-up roller fixing members 72; alternatively, when the seat frame 20 of the seat unit is fixedly connected to the leg longitudinal beam 40, the take-up roller 70 can also be fixedly connected to the bottom side of the seat frame 20 by its two take-up roller fixing members 72. The curtain 71 is fixedly connected to the inner side of the leg rest 43 at the curtain fixing point P1 by its curtain fixing member 73.

[0065] The leg actuator 47 is preferably configured as a linear actuator acting between the leg cross beam 41 and the guide cross beam 44. By adjusting the leg actuator 47, the distance between the drive guide cross beam 44 and the leg cross beam 41 is increased or decreased, thereby realizing the forward and backward sliding of the leg sliding rod 42 in the leg longitudinal beam 40.

[0066] When the distance between the guide cross beam 44 and the leg cross beam 41 increases, the leg sliding rod 42 extends outward from the front end of the leg longitudinal beam 40, thereby driving the curtain 71 to extend outward from the take-up roller 70. The curtain 71 is tightened under the action of the reset force, so that the pulling force applied to the leg rest 43 at the curtain fixing point P1 pulls it towards the take-up roller 70 located at the front end of the leg longitudinal beam 40. Thus, while the curtain 71 unfolds itself, it prompts the leg rest 43 to flip forward, thereby realizing Figure 2 the extended position shown. Conversely, when the distance between the guide cross beam 44 and the leg cross beam 41 decreases, the leg sliding rod 42 retracts into the leg longitudinal beam 40, and the reset force applied by the reset device gradually decreases, thereby allowing the leg rest 43 to gradually reset and flip until the inner side of the leg rest 43 abuts against the front end of the leg longitudinal beam, thereby realizing Figure 1 the retracted position shown.

[0067] To make the movement process of the leg assembly 4 changing between the retracted position and the extended position more reliable, the curtain specified point P1 should always be higher than the pivot axis 45a during the above change process. In addition, as shown in Figure 8 , in the extended position of the leg assembly 4, the distance L1 between the curtain fixing point P1 and the take-up roller 70 is less than the distance L2 between the pivot axis 45a and the take-up roller 70. This prevents the leg rest 43 from accidentally falling off. Figure 8 As shown, in the extended position of the leg assembly 4, the distance L1 between the curtain fixing point P1 and the take-up roller 70 is less than the distance L2 between the pivot axis 45a and the take-up roller 70. This prevents the leg rest 43 from accidentally falling off.

[0068] The leg assembly 4 is integrally modularly constructed and can be widely applied to various types of seat units.

Claims

1. A leg assembly for a seat unit, characterized in that, The leg assembly at least comprises: - A pair of leg longitudinal beams extending in the front - rear direction of the seat unit; - A pair of leg sliding rods slidable relative to the leg longitudinal beams in the front - rear direction of the seat unit; - A leg rest plate pivotally connected to the front end of the leg sliding rod, and - A reset device, which includes a retraction roller and a curtain retractably received in the retraction roller, wherein the reset device is fixedly connected to the leg longitudinal beam on one hand and fixedly connected to the leg rest plate on the other hand, wherein the leg assembly can be transformed between a retracted position and an extended position. In the retracted position, the leg sliding rods are retracted into the leg longitudinal beams; in the extended position, the leg sliding rods project forward from the leg longitudinal beams, During the transformation of the leg assembly from the retracted position to the extended position, the curtain unfolds outwards from the retraction roller against the reset force, so as to cover the leg sliding rods projecting forward from the leg longitudinal beams; and during the transformation of the leg assembly from the extended position to the retracted position, the curtain retracts into the retraction roller under the action of the reset force.

2. The leg assembly according to claim 1, wherein, The reset device is fixedly connected to the leg longitudinal beam on one hand and fixedly connected to the inner side of the leg rest plate on the other hand, wherein during the transformation of the leg assembly from the retracted position to the extended position, the curtain applies a pulling force to the leg rest plate, so that the leg rest plate unfolds forward relative to the leg longitudinal beam.

3. The leg assembly according to claim 2, wherein, The leg assembly includes a leg rest plate link rod, which is pivotally connected to the front end of the leg sliding rod and fixedly connected to the leg rest plate, so that the leg rest plate is pivotally connected to the leg sliding rod around a pivot axis by means of the leg rest plate link rod.

4. The leg assembly according to claim 3, wherein The retraction roller is fixedly connected at a fixed position relative to the leg longitudinal beam, and the free end of the curtain is fixedly connected to the inner side of the leg rest plate at a curtain fixing point.

5. The leg assembly according to claim 4, characterized in that, During the transformation of the leg assembly between the retracted position and the extended position, the curtain fixing point is always located above the pivot axis.

6. The leg assembly according to claim 5, wherein In the extended position of the leg assembly, the distance between the curtain fixing point and the retraction roller is less than the distance between the pivot axis and the retraction roller.

7. The leg assembly according to claim 1, wherein, The width of the curtain is not less than the distance between the pair of leg longitudinal beams.

8. The leg assembly according to claim 1, wherein The leg longitudinal beam includes a guide rail extending in the front - rear direction of the seat unit.

9. The leg assembly according to claim 1, wherein The leg longitudinal beam includes a guide groove extending in the front - rear direction of the seat unit.

10. The leg assembly according to claim 1, wherein, The retraction roller includes at least one retraction roller fixing member, and the curtain is provided with at least one curtain fixing member at its free end.

11. The leg assembly according to claim 1, wherein The curtain is made of a flexible material.

12. A seat unit, characterized in that, The seat unit at least comprises: - A seat part unit, which includes a seat frame for attaching a seat portion; and - The leg assembly according to any one of the above - mentioned claims.

13. The seat unit according to claim 12, characterized in that, The leg longitudinal beam is fixedly connected to the seat frame directly or indirectly.

14. The seat unit according to claim 13, characterized in that, The reset device is fixedly connected to the front end portion of the leg longitudinal beam on one hand and fixedly connected to the leg rest plate on the other hand.

15. The seat unit according to claim 13, characterized in that, The reset device is fixedly connected to the bottom side of the seat frame on one hand and fixedly connected to the leg rest plate on the other hand.

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