Linkage folding frame and baby carriage

Abstract

The utility model belongs to the technical field of baby carriages, and particularly relates to a linkage folding frame and a baby carriage. Comprising a handrail frame set, an upper frame set, a lower front frame set, a lower rear frame set and a linkage rod set, the handrail frame set is hinged to the upper side of the upper frame set, and the lower front frame set and the lower rear frame set are hinged to the lower side of the upper frame set; the linkage rod sets comprise the first linkage rod set and the second linkage rod set which are oppositely arranged on the two sides, the first linkage rod set comprises an upper linkage rod and a lower linkage rod, the upper end of the upper linkage rod is connected with the armrest frame set, the upper linkage rod is hinged to the lower rear frame set, the upper end of the lower linkage rod is connected with the upper linkage rod, and the lower linkage rod is hinged to the lower rear frame set. Due to the fact that the linkage rod set is additionally arranged, the lower front frame set can be driven to move together during folding, and therefore folding operation is simpler and more convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of children's vehicles, and particularly relates to a folding frame and a stroller. Background Technology

[0002] To facilitate storage and transportation, most children's stroller frames on the market are designed to be foldable. These frames typically consist of an upper frame, a lower frame, and a handlebar frame. For ease of use and folding, a linkage locking mechanism is usually installed at the hinge points, allowing the frame to unlock and fold together as needed. However, this method lacks the linkage between the folding and unfolding actions. For example, after unlocking, the user must manually rotate the handlebar frame and then the lower frame to fold, which reduces the convenience of folding. Utility Model Content

[0003] The purpose of this utility model is to provide a linkage folding frame, which, by adding a linkage rod group, can drive the lower front frame group to move together when folding, thereby making the folding operation simpler and more convenient.

[0004] Based on this, the present invention provides a linkage folding frame, including a handrail frame assembly, an upper frame assembly, a lower front frame assembly, a lower rear frame assembly, and a linkage rod assembly. The handrail frame assembly is hinged to the upper side of the upper frame assembly, and the lower front frame assembly and the lower rear frame assembly are respectively hinged to the lower side of the upper frame assembly.

[0005] The linkage assembly includes a first linkage assembly and a second linkage assembly arranged opposite to each other on both sides. The first linkage assembly includes an upper linkage rod and a lower linkage rod. The upper end of the upper linkage rod is connected to the handrail frame assembly and is hinged to the lower rear frame assembly. The upper end of the lower linkage rod is connected to the upper linkage rod and the lower end is connected to the lower front frame assembly. When the armrail frame is closed, the handrail frame assembly drives the upper linkage rod to rotate relative to the lower rear frame assembly along the hinge point, and drives the lower front frame assembly to rotate towards the lower rear frame assembly through the lower linkage rod.

[0006] As described above, in a linkage folding frame, the upper frame assembly is further provided with a first crossbar, and a second crossbar located behind the first crossbar is provided between the first linkage rod assembly and the second linkage rod assembly. When folding, the second crossbar is relatively far away from the first crossbar.

[0007] In the aforementioned type of folding frame, when unfolded, the first crossbar and the second crossbar remain in a horizontal position.

[0008] As described above, in a linkage folding frame, a first hinge assembly is further provided between the handrail frame assembly and the upper frame assembly. The first hinge assembly includes a first upper hinge seat, a second upper hinge seat, and an upper locking assembly provided on the first upper hinge seat and the second upper hinge seat.

[0009] The first upper hinge seat is connected to the handrail frame assembly, the second upper hinge seat is connected to the upper frame assembly, and the upper locking component is used to restrict the first upper hinge seat from rotating relative to the second upper hinge seat. The handrail frame assembly or the upper frame assembly is also provided with an unlocking component for unlocking the locking component.

[0010] In the aforementioned linkage folding frame, the upper end of the upper linkage rod is hinged to the first upper hinge seat and can be rotated by the first upper hinge seat to drive it to rotate relative to the lower rear frame assembly.

[0011] This utility model also provides a stroller, including the above-mentioned linkage folding frame, and a seat assembly. The seat assembly includes a seat and a backrest. The backrest is hinged to the rear side of the seat. The bottom of the seat is provided with a mounting seat connected to the first crossbar and the second crossbar. When folded, the first crossbar and the second crossbar move relative to each other to drive the seat to rotate.

[0012] As described above, the mounting base includes a first mounting base and a second mounting base. The first mounting base is connected to the second crossbar and is looped around the outside of the second crossbar. The front end of the second mounting base has a limiting opening for the first crossbar to enter from the front. When unfolded, the first crossbar is located within the limiting opening.

[0013] As described above, the stroller also has a webbing at the bottom of the seat, which extends along the moving direction of the first crossbar and is located below the first crossbar.

[0014] As described above, in a stroller, the backrest includes an upper backrest and a lower backrest, the upper backrest and the lower backrest being hinged to each other, and the lower backrest being hinged to the seat;

[0015] The lower backrest is connected to the upper frame assembly via a connecting strap and can rotate relative to the seat as the upper frame assembly rotates. When folded, the upper backrest rotates and folds down towards the lower backrest direction.

[0016] As described above, the stroller also includes a sunshade on the armrest assembly, and the upper backrest is connected to the armrest assembly or the sunshade.

[0017] Implementing the embodiments of this utility model has the following beneficial effects:

[0018] 1. This utility model provides a linkage folding frame, which is divided into a handrail frame group, an upper frame group, a lower front frame group, and a lower rear frame group. When folding, the handrail frame group rotates to the upper frame group, the upper frame group rotates to the lower rear frame group, and the lower front frame group rotates to the lower rear frame group. This solution sets a linkage rod group on the handrail frame group that is connected to the lower front frame, so that when the handrail frame group moves, it drives the lower front frame to move synchronously, so as to perform linkage folding, which makes the folding efficiency higher and the folding operation simpler and more convenient. Similarly, it also unfolds in linkage when unfolding.

[0019] 2. This utility model also provides a stroller, which adopts the linkage folding frame of this solution, and the seat assembly is installed in combination with the setting of its first crossbar and second crossbar. When folding, the seat assembly folds together with the frame through the movement of the first crossbar and the second crossbar. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the linkage folding frame of this utility model;

[0022] Figure 2 This is a side view of the folding and retracting frame;

[0023] Figure 3 This is an exploded view of the first hinge assembly;

[0024] Figure 4 This is a schematic diagram illustrating the retraction process of the frame.

[0025] Figure 5 This is a schematic diagram of the baby stroller of this utility model;

[0026] Figure 6 This is a schematic diagram of the bottom of the seat;

[0027] Figure 7 A schematic diagram of the bottom of the seat in its unfolded state;

[0028] Figure 8 A schematic diagram of the bottom of the seat in its folded state;

[0029] Figure 9 This is a diagram showing the stroller in its folded state. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 4 As shown, this utility model embodiment provides a linkage folding frame, including a handrail frame assembly 11, an upper frame assembly 12, a lower front frame assembly 13, a lower rear frame assembly 14, and a linkage rod assembly. The handrail frame assembly 11 is hinged to the upper side of the upper frame assembly 12, and the lower front frame assembly 13 and the lower rear frame assembly 14 are respectively hinged to the lower side of the upper frame assembly 12. When folding, the handrail frame assembly rotates to the upper frame assembly, the upper frame assembly rotates to the lower rear frame assembly, and the lower front frame assembly rotates to the lower rear frame assembly.

[0032] In addition, this solution also includes a linkage group, which includes a first linkage group 21 and a second linkage group 22 arranged opposite to each other on both sides. Due to the symmetrical structure of the frame, this solution also sets two groups, namely the first linkage group 21 and the second linkage group 22, which are respectively connected to the left and right sides. The following focuses on one of the linkage groups. The first linkage group 21 includes an upper linkage rod 211 and a lower linkage rod 212. The upper end of the upper linkage rod 211 is connected to the armrest frame group 11 and is hinged to the lower rear frame group 14. The upper end of the lower linkage rod 212 is connected to the upper linkage rod 211 and the lower end is connected to the lower front frame group 13. When the frame is closed, the armrest frame group 11 drives the upper linkage rod 211 to rotate relative to the lower rear frame group 14 along the hinge point, and drives the lower front frame group 13 to rotate towards the lower rear frame group 14 through the lower linkage rod 212. This solution involves setting up a linkage rod assembly on the handrail frame that connects to the lower front frame, so that when the handrail frame moves, it simultaneously drives the lower front frame to move, resulting in coordinated retraction and retraction. This makes the retraction and retraction more efficient and the operation simpler and more convenient. Similarly, it also extends in tandem when unfolding.

[0033] Specifically, in this design, the upper linkage 211 is roughly L-shaped, with its upper end hinged to the handrail assembly 11. When folding, the handrail assembly 11 rotates to drive the upper linkage 211. On the other side of the hinge, the lower end is hinged to the lower linkage 212. Thus, the upper linkage 211 rotates relative to the hinge position—that is, the lower rear frame assembly 14—and drives the lower linkage 212. Consequently, the lower front frame assembly 13, which is connected to the lower linkage 212, also rotates relative to the upper frame assembly 12 as the lower linkage 212 rotates, thus folding the frame.

[0034] Furthermore, a first hinge assembly 4 is provided between the handrail frame assembly 11 and the upper frame assembly 12. The first hinge assembly 4 includes a first upper hinge seat 41, a second upper hinge seat 42, and an upper locking assembly provided on the first upper hinge seat 41 and the second upper hinge seat 42.

[0035] The first upper hinge seat 41 is connected to the handrail frame assembly 11, and the second upper hinge seat 42 is connected to the upper frame assembly 12. The upper locking assembly is used to restrict the rotation of the first upper hinge seat 41 relative to the second upper hinge seat 42. The handrail frame assembly 11 or the upper frame assembly 12 is also provided with an unlocking assembly for unlocking the locking assembly. The locking assembly keeps the first upper hinge seat 41 and the second upper hinge seat 42 in the extended state, and after unlocking by the unlocking assembly, they can be rotated and folded.

[0036] In this solution, the locking component can adopt a gear locking structure commonly used in stroller frames. For example, in this solution, a locking wheel 51 is provided in the inner cavity of the first upper hinge seat 41 and the second upper hinge seat 42. The locking wheel 51's outer circumference engages with the locking teeth on the inner circumferential wall of the first upper hinge seat 41 and the second upper hinge seat 42 to restrict the rotation of the first upper hinge seat 41 relative to the second upper hinge seat 42. The locking component also includes a rotating wheel 52. When unlocking, the rotating wheel 52 is pulled to rotate, so that the rotating wheel 52 translates along its rotation axis during rotation. During translation, the locking wheel 51 is pushed, causing the locking wheel 51 to disengage from one of the inner cavities, thereby unlocking the relative rotation of the first upper hinge seat 41 and the second upper hinge seat 42.

[0037] Correspondingly, the unlocking component of this solution adopts the structure of an unlocking button, which is connected to the aforementioned rotating wheel 52 through an internal linkage rope. Thus, by pressing the unlocking button, the rotating wheel 52 can be pulled to rotate, thereby unlocking. Preferably, the unlocking component of this solution is set on the handrail frame 11 for the convenience of the user.

[0038] In this design, the upper end of the linkage rod 211 is hinged to the first upper hinge seat 41 and can be rotated by the first upper hinge seat 41 to drive it to rotate relative to the lower rear frame assembly 14. The first upper hinge seat 41 has a downwardly extending side connecting arm 411. In this design, the side connecting arm 411 is hinged to the upper linkage rod 211. Thus, when the handrail frame assembly 11 rotates with the first upper hinge seat 41, the side connecting arm 411 drives the upper end of the upper linkage rod 211 to move backward and upward, thereby increasing the range of movement of the upper linkage rod 211 and facilitating its rotation relative to the lower rear frame assembly 14 along the hinge point.

[0039] In this embodiment of the utility model, the linkage rod is equivalent to connecting the handrail frame group 11, the lower front frame group 13 and the lower rear frame group 14. When it is in the unfolded state, since the handrail frame group 11 is locked, the linkage rod group is also relatively locked, thereby locking the correspondingly connected lower front frame group 13, lower rear frame group 14 and upper frame group 12. Therefore, it remains in the unfolded state and will not be arbitrarily retracted.

[0040] Of course, this solution can also include corresponding limiting or locking structures at the hinge points of the lower front frame assembly 13 and the upper frame assembly 12, or at the hinge points of the lower linkage rod 212 and the upper linkage rod 211, so that the lower front frame assembly 13 is fixed in the unfolded state. For example, a locking structure can be installed to unlock the lower front frame assembly 13 during the rotation of the armrest frame assembly or the upper frame assembly. After unlocking, the lower front frame assembly 13 can be driven by the lower linkage rod 212 to perform a folding action. The locking structure can refer to the locking components mentioned above, or the joint locking structure commonly used on strollers.

[0041] In addition, in this embodiment of the present invention, the upper frame assembly 12 is further provided with a first crossbar 31, and a second crossbar 32 located behind the first crossbar 31 is provided between the first linkage rod assembly 21 and the second linkage rod assembly 22. When retracted, the second crossbar 32 is relatively far away from the first crossbar 31. By utilizing the change in the relative position of the linkage rod assembly and the upper frame assembly in the retracted state, the first crossbar 31 and the second crossbar 32 are provided so that the components assembled with the frame can also be retracted and unfolded accordingly with the changes in the first crossbar 31 and the second crossbar 32.

[0042] Preferably, when unfolded, the first crossbar 31 and the second crossbar 32 remain in a horizontal position. This is particularly suitable for installing seats or bed frames so that they remain horizontal when unfolded.

[0043] like Figures 5 to 9 As shown, this utility model also provides a stroller, employing the aforementioned linked folding frame, and further including a seat assembly 9. The seat assembly 9 includes a seat 91 and a backrest 92. The backrest 92 is hinged to the rear side of the seat 91. The bottom of the seat 91 is provided with a mounting seat connected to the first crossbar 31 and the second crossbar 32. When folded, the first crossbar 31 and the second crossbar 32 move relative to each other to drive the seat 91 to rotate. The seat assembly 9 is assembled with the frame via the first crossbar 31 and the second crossbar 32. Correspondingly, when the frame is folded, the linkage of the first crossbar 31 and the second crossbar 32 allows the seat 91 to fold synchronously with the frame.

[0044] Specifically, the mounting base includes a first mounting base 81 and a second mounting base 82. The first mounting base 81 is connected to the second crossbar 32 and is looped around the outside of the second crossbar 32. The front end of the second mounting base 82 has a limiting opening for the first crossbar 31 to enter from the front. When unfolded, the first crossbar 31 is located within the limiting opening. That is, the first mounting base 81 is fastened to the second crossbar 32, so that the second crossbar 32 cannot detach from the first mounting base 81, although it can rotate relative to the first mounting base 81. Specifically, in this solution, the first mounting base 81 can be looped around the outside of the second crossbar 32 by a latch and a latch tongue movably disposed at the entrance end of the latch. Thus, when the seat needs to be removed, it is only necessary to move the latch tongue. Of course, to maintain stability, two sets of mounting bases are also provided, located on both sides respectively.

[0045] Furthermore, in this embodiment of the present invention, the bottom of the seat 91 is also provided with a webbing 83. The webbing 83 extends along the moving direction of the first crossbar 31 and is located below the first crossbar 31. The webbing 83 effectively limits the lateral movement of the first crossbar 31 near the bottom of the seat 91. In particular, after the seat 91 is folded up and flipped over, it also serves to hold the seat 91 in place, preventing it from rotating and detaching from the first crossbar 31. Specifically, in this solution, one end of the webbing 83 is connected to the second mounting base 82, and the other end is connected to the bottom of the seat 91 near the front. Of course, this solution limits the webbing 83 to extend along the moving direction of the first crossbar 31, but does not specify that the extension direction is consistent with the moving direction of the first crossbar 31. For example, it can be inclined from the second mounting base 82 towards the front end. Of course, this embodiment also provides two webbing 83 to increase stability.

[0046] To further enhance the folding effect, the backrest 92 includes an upper backrest 921 and a lower backrest 922, which are hinged to each other. The lower backrest 922 is hinged to the seat 91. In the folded state, the upper backrest 921 rotates and folds towards the lower backrest 922.

[0047] Specifically, the lower backrest 922 is connected to the upper frame assembly 12 via a connecting strap 9220 and can rotate relative to the seat 91 as the upper frame assembly 12 rotates. When folded, the upper backrest 921 rotates and folds down towards the lower backrest 922. The armrest frame assembly 11 is also equipped with a sunshade 19, and the upper backrest 921 is connected to the armrest frame assembly 11 or the sunshade 19. Thus, in the unfolded state, the upper backrest is supported by the armrest frame assembly 11 or the sunshade 19, and the lower backrest 922 is supported by the upper frame assembly 12 via the connecting strap 9220. When folded, the armrest frame assembly 11 rotates towards the upper frame assembly 12, thereby causing the upper backrest 921 to rotate and fold down towards the lower backrest 922.

[0048] The overall folding process of this stroller is as follows:

[0049] Unlocking the locking component by unlocking the component unlocks the rotation between the handrail assembly 11 and the upper frame assembly 12. At this time, the handrail assembly 11 rotates from the front to the upper frame assembly 12, and drives the upper end of the upper linkage rod 211 to move and rotate as a whole. Its L-shaped end moves accordingly, thereby driving the lower front frame assembly 13 to rotate from the lower front to the lower rear frame assembly 14. During the rotation of the handrail assembly 11 from the front to the upper frame assembly 12, the upper frame assembly 12 also rotates and folds from the rear to the lower rear frame assembly 14 to complete the linkage folding of the frame.

[0050] During the process of the handrail assembly 11 rotating from the front towards the upper frame assembly 12, and the upper frame assembly 12 rotating from the rear towards the lower frame assembly 14, the lower backrest 922 is supported by the upper frame assembly 12, and the upper frame assembly 12 rotates rearward, causing the lower backrest 922 to rotate rearward to a posture basically the same as the upper frame assembly 12. Simultaneously, because the upper backrest 921 is supported by the handrail assembly 11 or the sunshade 19, the handrail assembly 11 rotates from the front towards the upper frame assembly 14. The rotation in two directions causes the upper backrest 921 to rotate in the direction of the lower backrest 922 and fold. In addition, due to the rotation of the linkage group, the first crossbar 31 moves away from the second crossbar 32. Since the seat 91 in this solution is essentially hinged to the second crossbar 32 at the rear end, the angle of the seat 91 finally becomes the angle of the support surface formed by the first crossbar 31 and the second crossbar 32. Generally speaking, it is coplanar with the lower backrest 922 and is in a near-vertical posture, thus forming a linkage between the frame and the seat for folding.

[0051] This utility model provides a linkage folding frame, which is divided into a handrail frame assembly, an upper frame assembly, a lower front frame assembly, and a lower rear frame assembly. When folding, the handrail frame assembly rotates to the upper frame assembly, the upper frame assembly rotates to the lower rear frame assembly, and the lower front frame assembly rotates to the lower rear frame assembly. This solution sets a linkage rod assembly on the handrail frame assembly that connects to the lower front frame, so that when the handrail frame assembly moves, it synchronously drives the lower front frame to move, thus performing linkage folding. This makes the folding efficiency higher and the folding operation simpler and more convenient. Similarly, it also unfolds in linkage when unfolding.

[0052] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A linkage folding frame, characterized in that, It includes a handrail frame assembly (11), an upper frame assembly (12), a lower front frame assembly (13), a lower rear frame assembly (14), and a linkage rod assembly. The handrail frame assembly (11) is hinged to the upper side of the upper frame assembly (12), and the lower front frame assembly (13) and the lower rear frame assembly (14) are respectively hinged to the lower side of the upper frame assembly (12). The linkage group includes a first linkage group (21) and a second linkage group (22) arranged opposite to each other on both sides. The first linkage group (21) includes an upper linkage (211) and a lower linkage (212). The upper end of the upper linkage (211) is connected to the handrail frame group (11) and the upper linkage (211) is hinged to the lower rear frame group (14). The upper end of the lower linkage (212) is connected to the upper linkage (211) and the lower end is connected to the lower front frame group (13). When the armrail frame group (11) is closed, the handrail frame group (11) drives the upper linkage (211) to rotate relative to the lower rear frame group (14) at the hinge point, and drives the lower front frame group (13) to rotate towards the lower rear frame group (14) through the lower linkage (212).

2. The linkage folding frame according to claim 1, characterized in that, The upper frame assembly (12) is also provided with a first crossbar (31), and a second crossbar (32) located behind the first crossbar (31) is provided between the first linkage rod assembly (21) and the second linkage rod assembly (22). When retracted, the second crossbar (32) is relatively far away from the first crossbar (31).

3. The linkage folding frame according to claim 2, characterized in that, When unfolded, the first crossbar (31) and the second crossbar (32) remain in a horizontal position.

4. The linkage folding frame according to claim 3, characterized in that, A first hinge assembly (4) is also provided between the handrail frame assembly (11) and the upper frame assembly (12). The first hinge assembly (4) includes a first upper hinge seat (41), a second upper hinge seat (42), and an upper locking assembly provided on the first upper hinge seat (41) and the second upper hinge seat (42). The first upper hinge seat (41) is connected to the handrail frame assembly (11), and the second upper hinge seat (42) is connected to the upper frame assembly (12). The upper locking component is used to restrict the first upper hinge seat (41) from rotating relative to the second upper hinge seat (42). The handrail frame assembly (11) or the upper frame assembly (12) is also provided with an unlocking component for unlocking the locking component.

5. A linkage folding frame according to claim 4, characterized in that, The upper end of the upper linkage rod (211) is hinged to the first upper hinge seat (41) and can be rotated by the first upper hinge seat (41) to drive it to rotate relative to the lower rear frame assembly (14).

6. A baby stroller, characterized in that, The vehicle includes a folding frame as described in any one of claims 2-5, and also includes a seat assembly (9), the seat assembly (9) including a seat (91) and a backrest (92), the backrest (92) being hinged to the rear side of the seat (91), the bottom of the seat (91) being provided with a mounting seat connected to the first crossbar (31) and the second crossbar (32), and when folded, the first crossbar (31) and the second crossbar (32) move relative to each other to drive the seat (91) to rotate.

7. A baby stroller according to claim 6, characterized in that, The mounting base includes a first mounting base (81) and a second mounting base (82). The first mounting base (81) is connected to the second crossbar (32) and is looped around the outside of the second crossbar (32). The front end of the second mounting base (82) has a limiting opening for the first crossbar (31) to enter from the front. When unfolded, the first crossbar (31) is located inside the limiting opening.

8. A stroller according to claim 6, characterized in that, The seat (91) is also provided with a webbing (83) at the bottom, which extends along the moving direction of the first crossbar (31) and is located on the lower side of the first crossbar (31).

9. A stroller according to claim 7, characterized in that, The backrest (92) includes an upper backrest (921) and a lower backrest (922), which are hinged to each other, and the lower backrest (922) is hinged to the seat (91); The lower backrest (922) is connected to the upper frame assembly (12) via a connecting strap (9220) and can rotate relative to the seat (91) as the upper frame assembly (12) rotates. When folded, the upper backrest (921) rotates and folds down towards the lower backrest (922).

10. A stroller according to claim 9, characterized in that, The armrest assembly (11) is also provided with a sunshade (19), and the upper backrest (921) is connected to the armrest assembly (11) or the sunshade (19).

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