CN219115619U - Spacing back structure and vehicle - Google Patents

Abstract

The present disclosure relates to a spacing back structure and vehicle. The limit backrest structure comprises: a support assembly connected to a body main body of the vehicle; and the limiting assembly is arranged on the supporting assembly, is positioned on the rear side of the cushion of the body main body and extends towards the upper side of the vehicle, and encloses a riding space with the cushion. The limiting component is arranged on the body main body through the supporting component, and is located above the rear side of the cushion, and the limiting component and the cushion enclose a riding space, so that the size of the riding space is reduced. When the vehicle rides, only one user can ride on the cushion to limit the number of people that the vehicle rided, avoid appearing the condition that double rided, guarantee the security of riding.

Description

Spacing back structure and vehicle

Technical Field

The disclosure relates to the technical field of travel equipment, in particular to a limit backrest structure and a vehicle.

Background

The shared bicycle and the shared battery truck are visible everywhere on the road, and the shared bicycle and the shared battery truck can stop along with the road, so that people can conveniently travel along with the road in daily life, and the low-carbon travel concept is met. However, with this, various behaviors that are not civilized and not standardized are also common, for example, it is often seen that two people on the road ride a battery car together. Because shared storage battery car is the instrument of riding for single in general, is for single design, because the load restriction and the structure restriction of vehicle, shared storage battery car generally does not allow double riding to guarantee the security that the user rided, avoid appearing the potential safety hazard. However, there is no physical limit to the double riding on the cushion of the shared battery car, if the user rides by double, the rear person can have the local unsettled condition, and there is a potential safety hazard.

Disclosure of Invention

Based on this, it is necessary to provide a spacing backrest structure and vehicle that can physically limit and guarantee riding safety for double riding, aiming at the problem that the cushion of the current shared battery car does not physically limit for double riding.

A limit backrest structure, which comprises a backrest body and a backrest body,

comprising the following steps:

a support assembly connected to a body main body of the vehicle; and

the limiting assembly is arranged on the supporting assembly, is positioned on the rear side of the cushion of the body main body and extends towards the upper side of the vehicle, and forms a riding space with the cushion.

In an embodiment of the disclosure, the support assembly is connected to a body frame of the body, or the support assembly is connected to a battery compartment of the body, or the support assembly is connected to an over-molded part of the body.

In an embodiment of the disclosure, the support assembly includes two first support members and two connecting members, the two first support members are symmetrically disposed on two sides of the seat cushion and extend towards the rear of the seat cushion, the connecting members are disposed corresponding to the first support members and protrude from the support members towards the seat cushion, and the first connecting members are connected with the body main body.

In an embodiment of the present disclosure, the connecting member is bent at least once.

In an embodiment of the disclosure, the limiting component further includes a second supporting member, two ends of the second supporting member are respectively connected with two first supporting members, a middle area of the second supporting member bends towards an upper side of the seat cushion to extend into a U shape, and the second supporting member and the seat cushion enclose into a riding space.

In an embodiment of the disclosure, the limit assembly further includes a cushion disposed on top of the second support and protruding from the second support in the seating space.

In an embodiment of the disclosure, the limiting component further includes a support plate, where the support plate is disposed on a side of the second support element facing away from the cushion and corresponds to the cushion.

In an embodiment of the disclosure, the limiting assembly further includes two transition sections, the two transition sections are in transition connection with the ends of the first support and the second support, and a dimension between the two transition sections connecting the first support is greater than a dimension connecting the second support.

In an embodiment of the disclosure, the limiting assembly further includes a handle, two ends of the handle are respectively connected with the transition section, and the handle is located below the cushion.

In an embodiment of the present disclosure, the first support, the transition section and the second support are of unitary construction;

the first support piece, the transition section and the second support piece are made of round pipes.

The vehicle comprises a vehicle body main body and the limit backrest structure according to any technical characteristic, wherein the limit backrest structure is arranged on the vehicle body main body and is positioned above the rear side of a cushion of the vehicle body main body, and the limit backrest structure and the cushion enclose a riding space.

According to the limit backrest structure and the vehicle, the limit backrest structure is added above the rear side of the cushion of the body main body, and the limit backrest structure and the cushion enclose a riding space, so that the riding space can only be used for a user to ride. Specifically, the supporting component of spacing back structure is connected at the automobile body main part to extend towards the rear of cushion, spacing subassembly is located the rear side of cushion, and connects supporting component, and spacing subassembly extends towards the top of cushion. At this moment, spacing subassembly is located the rear side top of cushion, and spacing subassembly and cushion can enclose to establish into and take the space, play the effect of physical separation through spacing subassembly, avoid appearing the problem that double ridden.

In this spacing back structure, spacing subassembly passes through supporting component and installs in the automobile body main part to make spacing subassembly be located the rear side top of cushion, enclose into through spacing subassembly and cushion and take the space, in order to reduce the size of taking the space. When the vehicle rides, only one user can ride on the cushion to limit the number of people that the vehicle rided, avoid appearing the condition that double rided, guarantee the security of riding.

Drawings

FIG. 1 is a perspective view of a check backrest structure mounted to a body of a vehicle from an angle, wherein a simplified vehicle body frame is shown below a battery compartment;

FIG. 2 is a schematic view of the check backrest structure of FIG. 1 mounted to a body of a vehicle from another perspective;

fig. 3 is a perspective view of the check backrest structure shown in fig. 1.

Wherein: 100. a limit backrest structure; 110. a support assembly; 111. a first support; 112. a connecting piece; 1121. a first connection plate; 1122. a second connecting plate; 1123. a third connecting plate; 120. a limit component; 121. a second support; 122. a transition section; 123. a back cushion; 124. a support plate; 125. a handle; 200. a body main body; 210. a vehicle body frame; 220. and a battery compartment.

Detailed Description

In order that the above-recited objects, features and advantages of the present disclosure will become more readily apparent, a more particular description of the disclosure will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. The present disclosure may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the disclosure, and therefore the disclosure is not to be limited to the specific embodiments disclosed below.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present disclosure.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.

In the present disclosure, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In this disclosure, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1-3, the present disclosure provides a spacing back structure 100. The limit backrest structure 100 is applied to a vehicle, and is used for limiting the number of riding persons of the vehicle, so as to avoid the occurrence of double riding. Optionally, the vehicle to which the spacing back structure 100 is applied is an electric vehicle. Alternatively, the electric vehicle is a shared electric bicycle or a private electric vehicle. Of course, in other embodiments of the present disclosure, the vehicle to which the backrest structure is applied may also be a shared bicycle. In the present disclosure, a vehicle to which the limit backrest structure 100 is applied is described as an electric vehicle.

It can be appreciated that, because the cushion of sharing storage battery car is single setting generally, because sharing storage battery car load restriction and structural limitation, sharing storage battery car generally does not allow double riding to guarantee the security that the user rided, avoid appearing the potential safety hazard. However, there is no physical limit to the double riding on the cushion of the shared battery car, if the user rides by double, the rear person can have the local unsettled condition, and there is a potential safety hazard.

For this reason, this disclosure increases spacing back structure 100 at the cushion rear side of vehicle, and this spacing back structure 100 encloses with the cushion and establishes into the space of taking, carries out spacingly to user's space of taking, avoids the condition of double riding to take place, guarantees the security that the user rided, avoids appearing the potential safety hazard. The following describes a specific structure of one embodiment of the spacing back structure 100.

Referring to fig. 1-3, in one embodiment, the check backrest structure 100 includes a support assembly 110 and a check assembly 120. The support assembly 110 is connected to a body main body 200 of the vehicle. The limiting assembly 120 is disposed on the support assembly 110, the limiting assembly 120 is disposed at a rear side of a seat cushion (not shown) of the body 200 and extends toward an upper side of the vehicle, and the limiting assembly 120 and the seat cushion enclose a seating space.

The limit backrest structure 100 is mounted on the body 200 and extends to the upper rear side of the seat cushion, and the limit backrest structure 100 and the seat cushion enclose a seating space. The space size of the rear side of the cushion is limited by the sitting space, the limit backrest structure 100 plays a role in physical limit, and sitting of a user is limited by the limit backrest structure 100, so that the limit space only allows one user to sit, two users cannot be accommodated, and the situation of double riding is avoided.

The support assembly 110 plays a role in supporting installation, and the support assembly 110 is installed at the body main body 200 of the vehicle to support and install the spacing assembly 120 to the body main body 200, so that the spacing assembly 120 can play a role in spacing. Moreover, the limiting assembly 120 limits the size of the rear side space of the cushion by limiting the upper side of the rear side of the cushion, so that the condition of double riding is avoided. For better description of the specific structure of the limit backrest structure 100, the azimuth is defined herein with reference to the traveling direction of the vehicle, the head direction of the vehicle is the front side, the tail direction of the vehicle is the rear side, the width direction of the vehicle is the left side and the right side, respectively, and the height direction of the vehicle is the up-down direction.

Specifically, the support assemblies 110 are disposed at the left and right sides of the seat cushion and are connected to the body 200 of the vehicle, the stopper assembly 120 is connected to the support assemblies 110 at the rear side of the seat cushion, and the stopper assembly 120 extends upward with respect to the seat cushion. That is, the support assembly 110 and the limiting assembly 120 are connected to form a structure similar to an L shape, so that the limiting assembly 120 is located at the rear side of the seat cushion and extends upward to separate the space between the rear side and the front side of the seat cushion, thereby effectively playing a role of limiting. At this time, the seat cushion and the limiting assembly 120 enclose to form a riding space, the size of the riding space is compressed, so that the riding space can meet the requirement of riding by a single person, but cannot meet the requirement of riding by two persons, so that the number of people riding by the vehicle is limited, the situation of riding by two persons is avoided, and the riding safety is ensured.

In the limit backrest structure 100 of the above embodiment, the limit component 120 is mounted on the body 200 through the support component 110, and the limit component 120 is located above the rear side of the seat cushion, and forms a seating space with the seat cushion through the limit component 120, so as to reduce the size of the seating space. When the vehicle rides, only one user can ride on the cushion to limit the number of people that the vehicle rided, avoid appearing the condition that double rided, guarantee the security of riding.

Referring to fig. 1 to 3, in an embodiment, the support assembly 110 is connected to a body frame 210 of the body 200, or the support assembly 110 is connected to a battery compartment 220 of the body 200, or the support assembly 110 is connected to an exterior molding of the body 200. It should be noted that, the position where the support assembly 110 is connected to the body 200 is not limited in principle, so long as the support assembly 110 is capable of reliably supporting the spacing assembly 120, and the spacing assembly 120 is reliably fixed to the body 200.

In this embodiment, the supporting component 110 is fixed to the body frame 210 of the body 200, and the body frame 210 is used to reliably support the supporting body and the limiting component 120, so as to ensure the limiting effect of the limiting component 120 on the riding space. Of course, in other embodiments of the present disclosure, the support assembly 110 may also be secured to the battery compartment 220 of the body 200, an overmolding of the body 200, or other locations where securing of the support assembly 110 is enabled. In the present disclosure, the support assembly 110 is only described as being provided in the vehicle body frame 210. The support assembly 110 is connected to the body frame 210 on both sides of the seat cushion, enabling reliable fixation of the restraint assembly 120 to the body frame 210.

Referring to fig. 1 to 3, in an embodiment, the support assembly 110 includes two first support members 111 and two connecting members 112, the two first support members 111 are symmetrically disposed on two sides of the seat cushion and extend towards the rear of the seat cushion, the connecting members 112 are disposed corresponding to the first support members 111 and protrude from the first support members 111 towards the seat cushion, and the connecting members 112 are connected to the body 200.

The first support 111 extends in the front-rear direction of the vehicle, and the first support 111 is connected to the body frame 210 at a front end and the first support 111 is connected to the bottom of the spacing assembly 120 at a rear end. After the two first supporting pieces 111 are symmetrically arranged on the left side and the right side of the seat cushion, the two first supporting pieces 111 can support the limiting assembly 120 on the two sides of the seat cushion, stability of the limiting assembly 120 is guaranteed, and the limiting assembly 120 is reliably fixed on the vehicle body frame 210.

Also, the first support 111 is connected at the front end to the body frame 210 through the corresponding connection 112. The connecting pieces 112 are located at the inner sides of the two first supporting pieces 111, and the connecting pieces 112 are protruded from the first supporting pieces 111, so that the connecting pieces 112 can be connected with the vehicle body frame 210, and the supporting assembly 110 and the vehicle body frame 210 can be conveniently connected and fixed. Meanwhile, the connection member 112 can increase the contact area of the first support 111 with the vehicle body frame 210, facilitating the fixation of the first support 111 to the vehicle body frame 210.

In one embodiment, the connecting member 112 is bent at least once. When the connecting member 112 connects the first support 111 with the vehicle body frame 210, the occupied space can be reduced, and the first support 111 can be easily connected with the vehicle body frame 210. Alternatively, the connection member 112 is provided in a plate shape to increase the contact area of the first support member 111 with the body frame 210. Alternatively, the plate-like connection member 112 is fixed to the body frame 210 by screws, ensuring the fixing reliability.

Alternatively, the connecting member 112 includes a first connecting plate 1121, a second connecting plate 1122, and a third connecting plate 1123, the second connecting plate 1122 is bent to connect the first connecting plate 1121 and the third connecting plate 1123, the first connecting plate 1121 is connected to the first supporting member 111, and the third connecting plate 1123 is connected to the vehicle body frame 210. The second connecting plate 1122 is bent with respect to the first connecting plate 1121, and the third connecting plate 1123 is bent with respect to the second connecting plate 1122, so that the first connecting plate 1121 can be attached to the surface of the first support 111, the third connecting plate 1123 can be attached to the surface of the vehicle body frame 210, the second connecting plate 1122 supports the first connecting plate 1121 and the third connecting plate 1123, and the first support 111 is ensured to be reliably fixed to the vehicle body frame 210.

Alternatively, the third connecting plate 1123 has a fixing hole through which the screw is mounted to the body frame 210. This allows the connector 112 to be reliably fixed to the vehicle body frame 210. Alternatively, the first connecting plate 1121 is fixed to the first support 111 by welding.

In an embodiment, the limiting assembly 120 further includes a second supporting member 121, two ends of the second supporting member 121 are respectively connected to the two first supporting members 111, a middle area of the second supporting member 121 is bent and extended towards an upper portion of the seat cushion to form a U shape, and the second supporting member 121 and the seat cushion enclose the seating space.

The second supporting piece 121 is bent to be in an inverted U-shaped arrangement, one end of the second supporting piece 121 is connected with the first supporting piece 111 on one side, the other end of the second supporting piece 121 is connected with the first supporting piece 111 on the other side, and the second supporting piece 121 extends to the upper side of the rear side of the seat cushion. The separation of the space above the cushion and the rear side space is realized through the second supporting piece 121, so that the second supporting piece 121 and the cushion enclose a riding space, a limiting effect is achieved, the riding space when a person rides is ensured, the riding space when the person rides is compressed, and the condition of double riding is avoided.

Alternatively, the second support 121 is provided in a rod or tube shape. Of course, in other embodiments of the present disclosure, the second support 121 may also be disposed above the rear side of the seat cushion in a flat plate or other structure capable of performing a restraining function.

In an embodiment, the limiting assembly 120 further includes a cushion 123, where the cushion 123 is disposed on top of the second support 121 and protrudes from the second support 121 in the seating space. The cushion 123 is disposed in the second support 121 and protrudes from the surface of the second support 121, and the cushion 123 protrudes toward the front, i.e., the cushion 123 is disposed at the front side of the second support 121 and protrudes. When a user sits on the seat cushion, the back of the user can lean against the back cushion 123, and the back cushion 123 can promote overall comfort, so that riding comfort is improved. Optionally, the cushion 123 is filled with a filler such as a sponge. Optionally, the outer layer of the back pad 123 is covered with a skin layer or the like.

In an embodiment, the limiting assembly 120 further includes a support plate 124, where the support plate 124 is disposed on a side of the second support 121 facing away from the cushion 123 and is disposed corresponding to the cushion 123. The support plate 124 is disposed at a rear side surface of the second support 121 and is located at a rear surface of the back pad 123. The back support 123 is supported to the backup pad 124 at the back of second support 121, realizes spacing fixed of cushion 123 for the position of cushion 123 is accurate, avoids the position of cushion 123 to take place the drunkenness. Alternatively, the support plate 124 is made of sheet metal or plastic, etc. Optionally, the support plate 124 and the cushion 123 are fixed by screws.

In an embodiment, the limiting assembly 120 further includes two transition sections 122, where the two transition sections 122 are in transitional connection with the ends of the first support 111 and the second support 121, and a dimension between the two transition sections 122 connecting the first support 111 is greater than a dimension connecting the second support 121.

One end of the second support member 121 is connected to one transition section 122, and one of the first support members 111 is connected through the transition section 122, and the other end of the second support member 121 is connected to the other transition section 122, and the other first support member 111 is connected through the transition section 122. Moreover, the distance between the two transition sections 122 is greater than the distance between the two transition sections 122 from top to bottom, and from the end connected to the second support member 121 to the end connected to the first support member 111, so that the size of the limit back structure 100 can be reduced while securing the limit supporting effect.

Alternatively, the end of the transition section 122 connected to the first support 111 is smoothly transitioned. In this way, the connection of the transition section 122 with the first support 111 can be facilitated, and the stress concentration of the connection of the transition section 122 with the first support 111 can be reduced, ensuring the reliability of the connection.

In an embodiment, the limiting assembly 120 further includes a handle 125, two ends of the handle 125 are respectively connected to the transition section 122, and the handle 125 is located below the cushion 123. One end of the handle 125 is connected with one transition section 122, the other end of the handle 125 is connected with the other transition section 122, and the handle 125 can facilitate the transportation of the vehicle. When in carrying, a user grasps the headstock and the handle 125, and the headstock and the handle are convenient to use.

Alternatively, the number of handles 125 is one, with one handle 125 being disposed on the front side, the rear side of the transition section 122 or in the transition section 122. Of course, the number of handles 125 is two, and two handles 125 are correspondingly arranged on the front side and the rear side of the transition section 122, so that the vehicle can be conveniently carried.

In one embodiment, the first support 111, the transition section 122 and the second support 121 are integrally formed. That is, the first supporting member 111, the second supporting member 121 and the transition section 122 are integrally formed to ensure the reliability of the overall structure. Of course, in other embodiments of the present disclosure, the first support 111, the transition section 122 and the second support 121 may be separately provided, and formed by welding, so as to ensure the overall structural strength.

Optionally, the first support 111, the transition section 122 and the second support 121 are formed by bending a rod/tube. Optionally, in an embodiment, the first support 111 and the transition section 122 and the second support 121 are made of circular pipe materials. Thus, the hand feeling during holding can be ensured, and uncomfortable feeling is avoided.

In the spacing back structure 100 of this disclosure, increase spacing subassembly 120 at the rear side of cushion, spacing subassembly 120 extends towards the top to enclose with the cushion and establish into the space of taking, in order to restrict the space when riding the user, guarantee the space of single riding, the space of compression double riding avoids avoiding the condition emergence of double riding. Meanwhile, the setting position of the support assembly 110 is not limited in principle, as long as the limiting effect of the limiting assembly 120 is ensured, and the support assembly 110 may be disposed at the body frame 210, the exterior plastic, the battery compartment 220, or other positions of the body main body 200. Moreover, the cushion 123 in the spacing assembly 120 can ensure overall comfort, and facilitates the transportation of the vehicle through the handle 125, ensuring comfort for the user during use.

The present disclosure further provides a vehicle, including a vehicle body main body 200 and the limit backrest structure 100 according to any one of the embodiments, where the limit backrest structure 100 is disposed on the vehicle body main body 200 and located above a rear side of a seat cushion of the vehicle body main body 200, and the limit backrest structure 100 and the seat cushion enclose a seating space. After the vehicle of the present disclosure adopts the limit backrest structure 100 of the above embodiment, the riding space of the user riding can be limited, the space of the user riding is ensured, the space of the user riding is compressed, and the situation of avoiding the user riding is avoided.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present disclosure, which are described in more detail and detail, but are not to be construed as limiting the scope of the disclosure. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the disclosure, which are within the scope of the disclosure. Accordingly, the scope of protection of the present disclosure should be determined by the following claims.

Claims (11)

1. A spacing back structure, characterized by comprising:

a support assembly connected to a body main body of the vehicle; and

the limiting assembly is arranged on the supporting assembly, is positioned on the rear side of the cushion of the body main body and extends towards the upper side of the vehicle, and forms a riding space with the cushion.

2. The check backrest structure of claim 1, wherein the support assembly is connected to a body frame of the body, or the support assembly is connected to a battery compartment of the body, or the support assembly is connected to an over-molded part of the body.

3. The spacing back structure of claim 1, wherein the support assembly includes two first support members and two connecting members, the two first support members are symmetrically disposed on two sides of the seat cushion and extend toward a rear of the seat cushion, the connecting members are disposed corresponding to the first support members and protrude from the first support members toward the seat cushion, and the connecting members are connected with the body.

4. A spacing back structure according to claim 3 wherein the connector is folded at least once.

5. The spacing back structure of claim 3, wherein the spacing assembly further comprises a second support member, two ends of the second support member are respectively connected with two first support members, a middle area of the second support member is bent and extended towards the upper side of the seat cushion to form a U shape, and the second support member and the seat cushion enclose the seating space.

6. The check backrest structure of claim 5, wherein the check assembly further comprises a cushion disposed on top of the second support and protruding from the second support in the seating space.

7. The spacing back structure of claim 6, wherein the spacing assembly further comprises a support plate disposed on a side of the second support facing away from the back pad and corresponding to the back pad.

8. The check backrest structure of claim 6, wherein the check assembly further comprises two transition sections that transition the ends of the first and second supports, and wherein the dimension between the two transition sections connecting the first support is greater than the dimension connecting the second support.

9. The spacing back structure of claim 8, wherein the spacing assembly further comprises a handle, two ends of the handle are respectively connected to the transition sections, and the handle is located below the cushion.

10. The spacing back structure of claim 9, wherein the first support, the transition section, and the second support are of unitary construction;

the first support piece, the transition section and the second support piece are made of round pipes.

11. A vehicle characterized by comprising a vehicle body and the limit backrest structure as claimed in any one of claims 1 to 10, wherein the limit backrest structure is provided on the vehicle body and above the rear side of a seat cushion of the vehicle body, and the limit backrest structure and the seat cushion enclose a seating space.

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