Leg assembly for seat unit and seat unit

Abstract

A leg assembly for a seat unit, comprising at least: a pair of leg longitudinal beams (40); a pair of leg sliding rods (42) capable of sliding relative to the leg longitudinal beams (40); a leg rest plate (43) pivotally connected to the front ends of the leg sliding rods (42); and a reset device (7), comprising a winding roller (70) and a curtain (71) retractably accommodated in the winding roller (70). The reset device (7) is, on the one hand, fixedly connected relative to the leg longitudinal beams (40), and is, on the other hand, fixedly connected to the inner side of the leg rest plate (43). The leg assembly (4) is capable of moving between a retracted position and an extended position, and in the process of the leg assembly (4) moving from the retracted position to the extended position, the curtain (71) overcomes a reset force to extend outwards from the winding roller (70), thereby covering the leg sliding rods (42) extending forwards from the leg longitudinal beams (40), and turning the leg rest plate (43) forwards.

Description

Leg assembly for seat unit and seat unit

[0001] Technical Field

[0002] The present invention relates to a leg assembly for a seat unit, and to a seat unit including said leg assembly. Background Technology

[0003] Various movable seating units are known in the prior art, such as sofas or chairs with multi-position conversion functions. As people's living standards improve, the safety requirements for sofas and chairs are also increasing. In known designs, movable seating units typically have a mechanical extension mechanism, allowing them to switch between a sitting position, a relaxed (or TV-like) position, and a reclining position. When the seating unit switches from a sitting position to a TV-like position, the footrest extends forward, while the angle between the backrest and the seat remains essentially unchanged. When the seating unit switches from a TV-like position to a reclining position, the footrest extends further forward and upward compared to the TV-like position, and the backrest reclines significantly. During these posture changes, the outward extension of the footrest exposes internal components of the mechanical extension mechanism, such as linkages and actuators. This poses a risk of the user being pinched or foreign objects falling into the interior of the seating unit.

[0004] To address these risks, various methods have been employed in existing seat unit designs. For example, a rigid baffle is placed in the leg area to enclose the space occupied by the leg unit in the TV or reclining positions. However, rigid baffles, limited by material properties, cannot flexibly and completely cover the gaps exposed by the leg unit. Another method is to use a completely covered material from the outside of the seat unit. However, this design approach is not advantageous in terms of material cost and cannot be widely applied to various types of seat units. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a movable seat with a simpler structure and easier assembly.

[0006] To solve the aforementioned technical problem, a leg assembly for a seat unit is provided, comprising at least:

[0007] A pair of leg longitudinal beams extending along the front-to-back direction of the seat unit;

[0008] A pair of leg sliding rods that are slidable relative to the leg longitudinal beam along the fore-and-aft direction of the seat unit;

[0009] The leg rest plate is pivotally connected to the front end of the leg sliding rod, and

[0010] a reset device comprising a retraction roller and a curtain which is accommodated in the retraction roller in a reset manner, wherein the reset device is fixedly connected on the one hand relative to the leg beam and on the other hand on the inner side of the leg rest plate,

[0011] wherein the leg assembly is transformable between a retracted position, in which the leg slide rods are retracted in the leg beam and the leg rest plate is folded in at the front end of the leg beam, and an extended position, in which the leg slide rods project forward from the leg beam and the leg rest plate is unfolded forward relative to the leg beam.

[0012] During the transformation of the leg assembly from the retracted position to the extended position, the curtain unfolds out of the retraction roller against a reset force, thereby covering the leg slide rods projecting forward from the leg beam and causing the leg rest plate to be flipped forward.

[0013] According to the invention, the curtain of the reset device is accommodated in the retraction roller in a reset manner, which means that the reset device has a reset tendency to automatically retract the curtain into the retraction roller. This reset tendency can be realized by various known principles, for example by means of a reset spring. When the curtain unfolds out of the retraction roller, the curtain is tensioned under the stress caused by the reset force, thereby exerting a pulling force on both ends of the reset device, namely the end fixedly connected relative to the leg beam and the end fixedly connected to the inner side of the leg rest plate, in opposite directions, thereby causing the leg rest plate to be flipped forward at the same time as the curtain unfolds itself.

[0014] This not only shields the leg slide rods projecting forward from the leg beam with the curtain, avoiding the risk of exposure of the interior and falling of foreign objects into it, but also gradually flips the leg rest plate by the pulling force resulting therefrom, thereby improving the comfort of use.

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

[0016] In reverse to the transformation from the retracted position to the extended position, when the leg slide rods are retracted into the leg beam, the reset force exerted by the reset device gradually decreases, thereby allowing the leg rest plate to be gradually reset flipped until the leg rest plate rests with its inner side against the front end of the leg beam.

[0017] In a preferred embodiment, the leg assembly comprises a leg rest plate link pivotally connected to the front end of the leg slide bar and fixedly connected to the leg rest plate, such that the leg rest plate is pivotally connected to the leg slide bar by means of the leg rest plate link about the pivot axis. The retraction roller is fixedly connected relative to the leg longitudinal beam, and the free end of the curtain is fixedly connected on the inner side of the leg rest plate at a curtain fixation point.

[0018] However, it is also conceivable in an alternative embodiment that the free end of the curtain is fixedly connected relative to the leg longitudinal beam, and the retraction roller is fixedly connected on the inner side of the leg rest plate.

[0019] In a preferred embodiment, the curtain fixation point is always located above the pivot axis during the transformation of the leg assembly between the retracted position and the extended position. Preferably, the distance between the curtain fixation point and the retraction roller is smaller than the distance between the pivot axis and the retraction roller in the extended position of the leg assembly. Thereby, the pulling force exerted by the curtain at the fixation point on the inner side of the leg rest plate forms a greater moment of force with the pivot axis as fulcrum, in order to more effectively lift the leg rest plate upwards with reference to the pivot axis away from the end of the curtain fixation point, thereby achieving the forward tilting of the leg rest plate.

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

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

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

[0023] Correspondingly, the adaptation structure of the leg slide bar can be adjusted according to the configuration of the leg longitudinal beam. For example, when the leg longitudinal beam comprises a guide rail, the leg longitudinal beam can comprise a slider adapted thereto; when the leg longitudinal beam comprises a guide groove, the leg longitudinal beam can additionally comprise a roller or a bayonet adapted to the guide groove.

[0024] In a preferred embodiment, the retraction roller comprises at least one retraction roller fixing and the curtain is provided with at least one curtain fixing at its free end. Preferably, one retraction roller fixing each can be provided at both ends of the retraction roller in the transverse direction of the seat unit, and one curtain fixing can be provided centrally on the free end of the curtain. The retraction fixing and the curtain fixing can be realized in various ways, for example as eyelets through which a hook can be passed, as a perforated tab through which a pin or rivet can be passed, as a threaded hole with which a screw can be connected, etc. Of course, adhesive or welding connections are also conceivable.

[0025] In a preferred embodiment, the curtain is made of a flexible material. Thereby, the curtain can not only be easily accommodated, for example wound, in the retraction roller, but can also be better adapted to various seat unit types.

[0026] To solve the technical problem, the application also relates to a seat unit comprising at least:

[0027] - a seat unit comprising a seat frame for attaching a seat part; and

[0028] - a leg assembly according to any one of the preceding claims.

[0029] Of course, the seat unit can also comprise a backrest unit and optionally a base unit.

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

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

[0032] In a preferred embodiment, the reset device is fixedly connected on the one hand to the bottom side of the seat frame and on the other hand to the inner side of the leg rest plate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Embodiments of the application are explained in detail below with the aid of the drawings.

[0034] Fig. 1 shows a partial perspective view of a seat unit according to an embodiment of the application, the leg assembly of which is in a retracted position;

[0035] Fig. 2 shows a partial perspective view of the seat unit shown in Fig. 1, the leg assembly of which is in an extended position;

[0036] Fig. 3 shows a perspective view of the reset device of the seat unit shown in Fig. 1, in which the curtain is retracted in the retraction roller;

[0037] Figure 4 schematically shows a perspective view of the reset device shown in Figure 3, wherein the curtain unfolds outward from the take-up roller;

[0038] Figure 5 schematically shows another partial perspective view of the seat unit according to the invention, viewed from a slightly lower angle, with its leg assembly in an extended position;

[0039] Figure 6 schematically shows the seat unit shown in Figure 5 as viewed from an obliquely upward angle;

[0040] Figure 7 schematically shows a side view of the seat unit shown in Figure 5; and

[0041] Figure 8 schematically shows a partial enlarged view of the seat unit shown in Figure 7. Embodiments of the present invention

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The term "one embodiment" or "implementation" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the present invention and for 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, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. 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 such data can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein.

[0044] Furthermore, it is to be noted that the "front-rear direction" in the present application refers to the direction of extension of the seat unit, in particular of the leg assembly of the seat unit, and in particular, the "front" refers to the direction towards the leg assembly and the "rear" refers to the direction towards the backrest unit. The "left-right direction" or "transverse direction" or "lateral direction" refers to the direction perpendicular to the "front-rear direction" in horizontal direction of the seat unit.

[0045] Fig. 1, Fig. 2 and Fig. 5 to Fig. 7 show a seat unit according to an embodiment of the present application. As shown in Fig. 1, the seat unit comprises 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 can be an armrest floor type seat unit, and accordingly, the base unit 1 has a pair of fixed plates 12 extending in length along the front-rear direction of the seat unit, a rear base crossbeam 13 extending transversely between the two fixed plates 12, and a front base crossbeam 14. In Fig. 1, for the sake of simplicity, one of the fixed plates 12 is omitted and only one fixed plate 12 is shown. The fixed plate 12 is fixedly connected, for example by means of riveting, screwing or the like, to the inner side of an armrest mounting plate fixedly connected to the armrest portion of the seat unit, and the fixed plate 12 is fixedly connected to the rear base crossbeam 13 and the front base crossbeam 14, respectively. In order to further improve the stability of the base unit 1, a front base crossbeam 14 is also provided at the front of the fixed plate 12, extending transversely between the fixed plates 12 and fixedly connected thereto. Here, the fixed plates 12, the connecting strips 11, the rear base crossbeam 13 and the front base crossbeam 14 are, for example, separate components that can be fixedly connected, respectively, however, two or more of the fixed plates 12, the rear base crossbeam 13 and the front base crossbeam 14 can also be configured as one-piece components.

[0047] Alternatively, however, the base unit 1 can also have other structures in embodiments not shown, for example, be configured as a tripod floor type base unit, the fixed plates 12 of which are not fixedly attached to the inner side of the armrest portion, but rather a plurality of legs for supporting on the ground extend downward from the fixed plates 12, or the base unit does not have fixed plates 12, but rather comprises a swivel support rotatably supported on the ground.

[0048] The seat unit 2 comprises a pair of seat carrier assemblies movable relative to the base unit 1 along the front-rear direction of the seat unit. The seat carrier assemblies comprise an upper seat longitudinal beam 21, a lower seat longitudinal beam 24 extending along the front-rear direction of the seat unit, and 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, wherein the rear portion of the upper seat longitudinal beam 21 comprises two upwardly directed protrusions, namely a front seat frame protrusion 21a and a rear seat frame protrusion 21b. Thereby, a stable frame structure is formed.

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

[0050] The backrest unit 3 is configured for mounting a backrest of the seat unit, which is not specifically shown.

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

[0052] Preferably, the backrest unit 3 comprises a backrest bracket 31, a first backrest link 32 and a second backrest link 33. The backrest bracket 31 is configured in a substantially L shape, which is pivotally connected with respect to the upper seat frame longitudinal beam 21, wherein the front end of the backrest bracket 31 is pivotally connected with the front seat frame protrusion 21a; the second backrest link 33 is configured as a curved link, which comprises three pivot points, namely a pivot point at the middle of the curved link and two pivot points respectively at the two ends of the curved link. By this means, the second backrest link 33 is pivotally connected with its upper end with the lower end of the first backrest link 32, the upper end of the first backrest link 32 is pivotally connected with the middle of the backrest bracket 31, and the second backrest link 33 is pivotally connected with the rear seat frame protrusion 21b by means of the pivot point at its middle. In addition, the backrest unit 3 further comprises an auxiliary backrest link 34, one end of which is connected with 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-rear direction of the seat unit, the backrest bracket 31 is correspondingly tilted backward and forward.

[0054] According to the present application, the leg assembly 4 comprises a pair of leg longitudinal beams 40, a leg cross beam 41 transversely connected between the leg longitudinal beams 40, a pair of leg sliding rods 42, and a leg rest plate 43 connected with the leg sliding rods, wherein the leg sliding rods 42 are slidably guided with respect to the leg longitudinal beams 40, so as to enable the leg sliding rods 42 to drive the leg rest plate 43 to move along the leg longitudinal beams 40 in the front-rear direction of the seat unit.

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

[0056] Preferably, the leg longitudinal beam 40 is configured as a slide rail member, wherein the leg longitudinal beam 40 comprises a guide rail having a C-shaped cross section; correspondingly, the leg slide bar 42 comprises a sliding block at its rear end, so that the leg slide bar 42 is shape-fittingly and movably embedded in the guide rail of the leg longitudinal beam 40, thereby realizing the sliding guide of the leg slide bar 42 in the leg longitudinal beam 40, and thereby realizing the transformation of the leg assembly 4 between the retracted position and the extended position.

[0057] The leg longitudinal beam 40 comprises at least two mounting tabs, namely a front mounting tab 48a and a rear mounting tab 48b respectively located at the front end and the rear end thereof. In this embodiment, the mounting tabs are respectively configured as bent members protruding inwardly from the front end and the rear end of the leg longitudinal beam 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, by means of which the leg assembly 4 is fixedly mounted on the bottom side of the seat frame 20 from below the seat unit.

[0058] The leg rest plate 43 is configured as a plate-shaped member extending over at least part of the lateral width of the seat unit as a whole. The leg slide bar 42 is slidably embedded in the leg longitudinal beam 40 at its rear end, and is connected with the leg rest plate 43 at its front end. Preferably, the leg slide bar 42 is connected with the leg rest plate 43 by means of the leg rest plate link 45 arranged at the front end thereof. As shown in particular in FIG. 8, the leg rest plate link 45 is configured as having an L-shaped cross section, one side of which is pivotally connected with the leg slide bar 42, and the other side of which is fixedly connected with the leg rest plate 43, so that the leg rest plate 43 can be pivoted relative to the leg slide bar 42 about the pivot axis 45a.

[0059] In order to realize the motion synchronization of the leg slide bars 42, a guide cross beam 44 is transversely connected between the leg slide bars 42. Preferably, the connection between the leg slide bars 42 and the guide cross beam 44 is realized by welding, riveting, screwing, etc. The guide cross beam 44 is located in front of the leg cross beam 41.

[0060] The leg assembly 4 can be transformed between the retracted position shown in FIG. 1 and the extended position shown in FIG. 2. In the retracted position, the leg slide bars 42 are retracted in the leg longitudinal beam 40, and the leg rest plate 43 is folded at the front end of the leg longitudinal beam 40; in the extended position, the leg slide bars 42 are extended forward from the leg longitudinal beam 40, and the leg rest plate 43 is unfolded forward relative to the leg longitudinal beam 40.

[0061] The leg assembly 4 further comprises a reset member reset device 7, which comprises a winding roller 70 and a curtain 71. The winding roller 70 is elongated, has winding roller fixing members 72 at both ends thereof in the length direction, and has an inner space in which the curtain 71 can be partially accommodated. In order to enable the curtain 71 to be automatically reset and retracted into the winding roller 70, the reset device 7 comprises a reset member, such as a reset spring, which is not shown in the drawings. Since the structure and principle of such a reset spring are known, they will not be described here. The curtain 71 is flexibly configured, and is preferably made of a flexible fabric.

[0062] In the reset device 7 shown in Fig. 3, the curtain 71 is accommodated in the winding roller 70 in a reset manner, wherein a curtain fixing member 73 provided on the free end of the curtain 71 extends out of the winding roller 70; in the reset device 7 shown in Fig. 4, the curtain 71 is pulled out of the winding roller 70.

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

[0064] As shown in Figs. 5 and 6 in particular, the winding roller 70 of the reset device 7 is fixedly connected at the front mounting tab 48a of the front end of the leg longitudinal beam 40 by means of its two winding roller fixing members 72; alternatively, in the case where the seat frame 20 of the seat unit is fixedly connected with the leg longitudinal beam 40, the winding roller 70 can also be fixedly connected on the bottom side of the seat frame 20 by means of its two winding roller fixing members 72. The curtain 71 is fixedly connected to the inner side of the leg rest plate 43 at the curtain fixing point P1 by means of 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 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 member 44 and the leg cross member 41 increases, the leg slide rod 42 extends out of the front end of the leg longitudinal member 40, thereby causing the curtain 71 to extend out of the reeling roller 70. The curtain 71 is pulled tight under the action of the restoring force, thereby causing the pull force exerted on the leg rest plate 43 at the curtain fixing point P1 to pull the leg rest plate 43 towards the reeling roller 70 at the front end of the leg longitudinal member 40, thereby causing the leg rest plate 43 to flip forward while the curtain 71 is being extended, so as to achieve the extended position shown in Fig. 2. Conversely, when the distance between the guide cross member 44 and the leg cross member 41 decreases, the leg slide rod 42 is retracted into the leg longitudinal member 40, and the restoring force exerted by the restoring device gradually decreases, thereby allowing the leg rest plate 43 to gradually return to the flipped position, until the leg rest plate 43 is in abutment with the front end of the leg longitudinal member 40 with its inner side, so as to achieve the retracted position shown in Fig. 1.

[0067] To make the movement of the leg assembly 4 between the retracted position and the extended position more reliable, the curtain fixing point P1 should be always higher than the pivot axis 45a during the above-mentioned change process. In addition, as shown in Fig. 8, in the extended position of the leg assembly 4, the distance L1 between the curtain fixing point P1 and the reeling roller 70 is less than the distance L2 between the pivot axis 45a and the reeling roller 70. In this way, the leg rest plate 43 is prevented from accidentally falling over.

[0068] The leg assembly 4 is modularly configured as a whole, and can be widely applied to various types of seat units.

Claims

1. A leg assembly for a seat unit, comprising at least: a pair of leg longitudinal beams extending in a front-rear direction of the seat unit; a pair of leg slide bars slidable relative to the leg longitudinal beams in the front-rear direction of the seat unit; a leg rest plate pivotally connected to front ends of the leg slide bars, and a return device comprising a winding roller and a curtain retractably accommodated in the winding roller, wherein the return device is fixedly connected relative to the leg longitudinal beams on one hand and fixedly connected on the other hand to an inner side of the leg rest plate, wherein the leg assembly is transformable between a retracted position, in which the leg slide bars are retracted in the leg longitudinal beams and the leg rest plate is folded in front end portions of the leg longitudinal beams, and an extended position, in which the leg slide bars are extended forward from the leg longitudinal beams and the leg rest plate is unfolded forward relative to the leg longitudinal beams, wherein during transformation of the leg assembly from the retracted position to the extended position, the curtain unfolds out of the winding roller against a return force, thereby covering the leg slide bars extended forward from the leg longitudinal beams and turning the leg rest plate forward.

2. The leg assembly according to claim 1, wherein during transformation of the leg assembly from the extended position to the retracted position, the curtain is retracted into the winding roller under the action of the return force.

3. The leg assembly according to claim 1, wherein the leg assembly comprises a leg rest plate link pivotally connected to the front ends of the leg slide bars and fixedly connected to the leg rest plate, thereby pivotally connecting the leg rest plate to the leg slide bars about a pivot axis by means of the leg rest plate link.

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

5. The leg assembly according to claim 4, wherein during 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, a distance between the curtain fixing point and the winding roller is smaller than a distance between the pivot axis and the winding roller.

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

8. The leg assembly according to claim 1, wherein the leg longitudinal beams comprise rails extending in the front-rear direction of the seat unit.

9. The leg assembly according to claim 1, wherein the leg longitudinal beams comprise grooves extending in the front-rear direction of the seat unit.

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

11. Leg assembly according to claim 1, characterized in that the curtain is made of a flexible material.

12. A seat unit comprising at least: a seat unit comprising a seat frame for attaching a seat part; and a leg assembly according to any of the preceding claims.

13. Seat unit according to claim 12, characterized in that the leg stringers are fixedly connected, directly or indirectly, relative to the seat frame.

14. Seat unit according to claim 13, characterized in that the return means are fixedly connected, on the one hand, to the front end of the leg stringers and, on the other hand, to the inner side of the leg rest plate.

15. Seat unit according to claim 13, characterized in that the return means are fixedly connected, on the one hand, to the bottom side of the seat frame and, on the other hand, to the inner side of the leg rest plate.

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