Seat and battery mounting structure.

Abstract

A seat and battery securing structure in which a seat (2) and a travel battery (3) arranged below the seat (2) in a vehicle cabin (1) are secured to a cross member (6) arranged on a floor panel (4) and having a hat-shaped cross-section, the seat (2) being secured at a first position (P1) on the upper surface (61a) of the cross member (6), and the travel battery (3) being secured at a second position (P2) of the cross member (6) lower than the first position (P1). Thus, it is possible to, without the addition of a reinforcing structure, ensure the strength and rigidity with which the seat (2) and the travel battery (3) are secured and also to ensure foot space for the passenger.

Description

Seat and battery fixing structure

[0001] This case relates to a seat and battery fixing structure that fixes a seat and a driving battery to a floor panel of a vehicle.

[0002] Electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs) that can be externally charged or powered require a traction battery (also referred to as an "EV battery" or simply "battery") to supply power to the electric motor that drives the vehicle. These batteries are heavy and large in volume, and they must also be designed to minimize damage, such as deformation, in the event of a vehicle collision. For this reason, various structures have been proposed for arranging and supporting batteries in vehicles (see Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2017-165301

[0004] A structure in which a pair of front and rear cross members are disposed above the floor panel and directly support the seat and battery on these cross members is also conceivable. In such a structure, if the rigidity and strength of the cross members can be increased, the rigidity and strength of the support structure for the seat and battery can also be directly increased. This makes it easier to ensure the strength of the seat fixing part during a collision and also makes it easier to improve the effect of suppressing battery deformation during a vehicle collision (particularly a side collision).

[0005] However, depending on the structure of the seat and battery attachment to the cross member, stress may be concentrated in a portion of the cross member during a vehicle collision, resulting in insufficient strength and rigidity, which could result in insufficient strength at the seat attachment point and failure to suppress battery deformation. While adding a reinforcing structure to the cross member can ensure strength and rigidity, this makes it difficult to ensure sufficient legroom for occupants seated below and behind the seat. Furthermore, the structure of attaching the battery to the cross member itself may also narrow the legroom for occupants.

[0006] The present invention was devised in consideration of these problems, and one of its objectives is to provide a fixing structure for fixing a seat and a driving battery to a cross member on a floor panel that ensures both strength and rigidity without adding a reinforcing structure and also ensures sufficient legroom for occupants. However, this objective is not limited to this, and another objective of the present invention is to achieve effects that cannot be obtained by conventional techniques, which are derived from the configurations shown in the detailed description of the invention described below.

[0007] The disclosed seat and battery fixing structure can be realized as the following disclosed aspects or application examples, and solves at least part of the above-mentioned problems. The disclosed seat and battery fixing structure is a seat and battery fixing structure in which a seat in a vehicle interior and a driving battery located below the seat are fixed to a cross member having a hat-shaped cross section and disposed on a floor panel. The seat is fixed at a first position on an upper surface of the cross member, and the driving battery is fixed to a second position of the cross member that is lower than the first position.

[0008] According to the disclosed seat and battery fixing structure, the position where the seat is fixed to the cross member (first position) is different from the position where the traction battery is fixed to the cross member (second position), which makes it easier to avoid stress concentration on the cross member during a vehicle collision. This makes it easier to ensure the strength of the seat fixing part during a collision without adding a reinforcing structure to the cross member, and also makes it easier to increase the effect of suppressing deformation of the traction battery during a collision (particularly a side collision).

[0009] Furthermore, because the second position where the traction battery is secured to the cross member is located lower than the first position on the upper surface of the cross member, the components used to secure the traction battery do not protrude upward from the upper surface of the cross member. This makes it easier to ensure legroom below the seat for passengers seated behind the seat. Therefore, it is possible to ensure both strength and rigidity and legroom for passengers without adding any reinforcing structure.

[0010] 5 is a side view showing a fixing structure for a seat and a battery according to an embodiment. FIG. 7 is a perspective view of a main part of the interior of the vehicle showing the fixing structure of FIG. 1. FIG. 8 is a plan view of a main part of the interior of the vehicle showing the arrangement of the battery according to an embodiment. FIG. 9 is a cross-sectional view (cross-sectional view taken along the arrows A-A in FIG. 3) of a main part showing the arrangement of the battery according to an embodiment. FIG. 10 is a perspective view of a main part of the fixing structure of FIG. 1. FIG. 5 is a perspective view of FIG. 5 with the battery removed. FIG. 7 is a perspective view showing a battery fixing portion and a seat fixing portion of the fixing structure of FIG. 1. FIG. 7 is an enlarged view of a main part of FIG. 7. FIG. 8 is a perspective view showing a battery fixing portion of the fixing structure of FIG. 1. FIG. 9 is a side view showing the effect of the fixing structure of FIG. 1.

[0011] Referring to the drawings, a seat and battery fixing structure according to an embodiment will be described. The embodiments described below are merely examples, and are not intended to exclude various modifications or applications of techniques not explicitly described in the following embodiments. The configurations of the respective embodiments can be modified in various ways without departing from the spirit thereof. Furthermore, modifications can be selected or appropriately combined as needed. In the following description, the forward direction of the vehicle is defined as the forward direction (front of the vehicle), and left and right are defined based on the forward direction. The left and right direction of the vehicle is also referred to as the vehicle width direction. Furthermore, in the vehicle width direction, the side away from the vehicle body centerline is defined as the outer side, and the side approaching the vehicle body centerline is defined as the inner side.

[0012] 1 to 4, the fixing structure according to the embodiment fixes a seat 2 and a driving battery 3 in a vehicle interior 1 to a cross member 6 disposed on a floor panel 4. In this embodiment, a pair of front seats 2 (a right-side seat 2A and a left-side seat 2B) and a rear seat (not shown) are provided in the vehicle interior 1, and the rear portions of the front seats 2 and the driving battery 3 disposed below the front seats 2 are fixed by the fixing structure.

[0013] As shown in Figure 3, in the vehicle of this embodiment, a cross member 5 (hereinafter also referred to as the "front cross member 5") located at the front of the passenger compartment 1 and a cross member 6 (hereinafter also referred to as the "middle cross member 6") located at the middle in the fore-and-aft direction are welded to a floor panel 4 inside the passenger compartment 1. In other words, this fixing structure is a structure in which the cross member 6 is fixed to the rear of the two cross members 5, 6. A tunnel section 11 and a dash panel 12 are disposed on the floor panel 4 in front of the front cross member 5, and a pair of left and right side frames 13 are disposed on the left and right edges of the floor panel 4.

[0014] As shown in Figure 4, the driving battery 3 is configured by housing the battery modules 31 and wiring (not shown) inside a battery case 30. Although wiring and equipment for air conditioning the battery modules 31 are attached to the outside of the battery case 30, the battery case 30 is shown as a simple box in Figures 1 to 3, etc. Although not shown in detail, the battery case 30 consists of a case body with an open top and a battery cover that covers the top opening of the case body. Hereinafter, the driving battery 3 will also be simply referred to as the "battery 3."

[0015] The front cross member 5 and the intermediate cross member 6 both have a hat-shaped cross section. Each cross member 5, 6 is positioned with its top wall portion 51, 61, which is the top surface of the hat shape, facing upward, and both flange portions 53, 63, which are formed by bending the lower edges of the upright wall portions 52, 62 at both edges of the top wall portion 51, 61, are welded to the upper surface of the floor panel 4. As shown in Figure 3, in the vehicle of this embodiment, the intermediate cross member 6 extends linearly in the width direction, while the widthwise intermediate portion of the front cross member 5 is shifted forward relative to the left and right ends so as to be separated from the intermediate cross member 6, and extends while bending in the width direction in a plan view.

[0016] As shown in Figure 2, the fixing structures of the pair of front seats 2 (right seat 2A and left seat 2B) are symmetrical and substantially identical. These front seats 2 are installed on a pair of left and right seat rails 20 (i.e., an outer seat rail 20a and an inner seat rail 20b) so as to be slidable in the front-rear direction. Note that although the present embodiment focuses on the configuration of the left seat 2B in the vehicle interior 1, the right seat 2A has a similar configuration.

[0017] The front portion of the outer seat rail 20a is fixed to the top wall 51 of the front cross member 5 via the front leg 21a. The rear portion of the outer seat rail 20a is fixed to the top wall 61 of the intermediate cross member 6 via the rear leg 22a. Furthermore, because the front cross member 5 has shifted forward, the front portion of the inner seat rail 20b is fixed to the top wall 51 of the front cross member 5 via the front leg 21b and the auxiliary bracket 21c. The rear portion of the inner seat rail 20b is fixed to the top wall 61 of the intermediate cross member 6 via the rear leg 22b. Each fixation is performed using fastening members such as bolts.

[0018] 2 and 3, the battery 3 is disposed directly below the front seat 2, between the front cross member 5 and the intermediate cross member 6. As described above, the widthwise intermediate portion of the front cross member 5 is spaced apart from the intermediate cross member 6, so that the battery 3, which is relatively long in the fore-and-aft direction of the vehicle, can be accommodated between the two cross members 5, 6.

[0019] The height H1 (see FIG. 1) of the space directly below the front seat 2 (the space between the front seat 2 and the floor panel 4 below it) is limited by various conditions, and it is difficult to make this height H1 equal to or greater than the height H2 (see FIG. 4) of the battery 3. Therefore, in the vehicle of this embodiment, as shown in FIG. 4, a portion of the floor panel 4 protrudes downward to ensure space capable of accommodating the battery 3.

[0020] However, it is difficult to make a portion of the floor panel 4 protrude downward by more than a certain depth due to molding processes such as press working. Therefore, in this embodiment, an opening 4A (see FIGS. 4 and 6 ) is formed by cutting out the portion of the floor panel 4 where the battery 3 is to be placed, and a downwardly convex battery tray 41 is attached to this opening 4A. The battery tray 41 is fixed to the floor panel 4 in a liquid-tight manner and closes the opening 4A. Therefore, the upper half of the mounted battery 3 is located above the opening 4A of the floor panel 4, and the lower half is located in the space within the battery tray 41 below the opening 4A of the floor panel 4.

[0021] 2 and 3, a pair of left and right battery fixing brackets 7 (hereinafter referred to as "second brackets 7") are coupled to the battery case 30. The battery 3 is fixed to each second bracket 7 by welding, bolts, etc., and the front and rear ends of each second bracket 7 are fastened to the front cross member 5 and the middle cross member 6, respectively, thereby fixing the battery 3 to the vehicle.

[0022] The second bracket 7 is formed, for example, by press-forming a metal plate. As shown in FIG. 4 , the second bracket 7 of this embodiment is hat-shaped when viewed from the side. Specifically, the second bracket 7 includes a band-shaped case fixing portion 71 that is fixed to an upper portion of the battery case 30 (e.g., a battery cover) and extends in the fore-and-aft direction of the vehicle when the battery 3 is mounted on the vehicle; arm portions 72, 73 that are bent downward from the front and rear edges of the case fixing portion 71; and fastening portions 74, 75 that bend forward or rearward from the lower edges of the arm portions 72, 73 and extend horizontally. Furthermore, the widthwise center portions of the case fixing portion 71 and the arm portions 72, 73 are formed to protrude outward (away from the battery case 30) in a bead-like shape, enhancing their strength and rigidity. The bead is not essential and can be omitted.

[0023] As shown in Figures 1 to 5, the front fastening portion 74 of each second bracket 7 is fastened to the top wall portion 51 of the front cross member 5 with a bolt or the like. Meanwhile, the rear fastening portion 75 (one end) of each second bracket 7 is fastened to a cross-member-side bracket 8 (hereinafter referred to as the "first bracket 8") that is welded to the cross member 6, as shown in Figures 1, 4, and 5. The second bracket 7 (particularly its rear fastening portion 75) that secures the rear side of the battery 3 to the cross member 6 and the first bracket 8 form a battery securing portion for the battery 3 on the vehicle rear side. In other words, the battery securing portion has two brackets 7, 8, and secures the battery 3 to the cross member 6 via these two brackets 7, 8.

[0024] Here, the fixing structure of the rear of the front seat 2 and the rear of the battery 3 to the cross member 6 in which this fixing structure is adopted will be further described.

[0025] As described above, the rear portion of the outer seat rail 20a of the front seat 2 is directly fixed to the upper surface 61a of the top wall portion 61 of the cross member 6 via the rear leg portion 22a by fastening with bolts or the like. Also, the rear portion of the inner seat rail 20b of the front seat 2 is directly fixed to the upper surface 61a of the top wall portion 61 of the cross member 6 via the rear leg portion 22b by fastening with bolts or the like. Hereinafter, the fixed position (height position) on the rear side of the front seat 2 in the vehicle up-down direction is referred to as the first position P1 (see FIG. 1 ). In other words, the first position P1 is provided on the upper surface 61a of the top wall portion 61 of the cross member 6.

[0026] In contrast, the first bracket 8 to which the second bracket 7 is fastened is disposed between the outer rear leg 22a and the inner rear leg 22b, closer to the inner rear leg 22a, as shown in Figures 5 and 6. As shown in Figures 7 and 8, the first bracket 8 in this embodiment is welded to the surface 62a of the front upright wall 62 of the cross member 6 (the side surface of the cross member 6 facing the front of the vehicle) and to the upper surface (flange surface) 63a of the front flange 63. Hereinafter, the fixing position (height position) on the rear side of the battery 3 in the vehicle up-down direction will be referred to as the second position P2 (see Figure 1). In other words, the second position P2 is lower than the first position P1, and in this embodiment, it is provided on the side surface 62a of the cross member 6 facing the front.

[0027] The second position P2 can be considered the position where the battery fixing portion (the fastening portion 75 at the rear of the second bracket 7 and the first bracket 8) is fixed to the cross member 6. It need only be lower than the first position P1, and can be set on at least one of the side surface 62a and flange surface 63a on the vehicle front side of the cross member 6. The second position P2 is not limited to a single point in the vertical direction (a certain height position), but may have a range in the vertical direction, as shown in FIG. 8 . In the fixing structure of this embodiment, the rear of the battery 3 is fixed to the cross member 6 via the first bracket 8, and therefore the entire fixing range of the first bracket 8 relative to the cross member 6 is the second position P2. Even when the second position P2 has such a range, the second position P2 is still lower than the first position P1.

[0028] The first bracket 8 has a bracket main body 81 formed by bending a metal plate of a predetermined shape, and a bolt portion 82 protruding upward from the bracket main body 81. As shown in Fig. 8 , the bracket main body 81 has a base surface portion 81a that is parallel to the upper surface 63a (hereinafter referred to as "flange surface 63a") of the flange portion 63 on the vehicle front side of the cross member 6 and extends in the extension direction of the cross member 6 (i.e., the vehicle width direction), and two support surface portions 81b that are bent downward from both sides of the extension direction of the base surface portion 81a. A flange-shaped first fixing portion 81c is bent and formed at the lower edge of each support surface portion 81b, and a flange-shaped second fixing portion 81d is bent and formed at the side edge of each support surface portion 81b facing the cross member 6.

[0029] In other words, the bracket body 81 has two flange-shaped first fixing portions 81c that are spaced apart and fixed to the flange surface 63a by welding, a base surface portion 81a that is located between and above the two first fixing portions 81c and that is arranged parallel to the flange surface 63a, and two support surface portions 81b that connect both sides of the base surface portion 81a to each of the first fixing portions 81c. Furthermore, the bracket body 81 of this embodiment has flange-shaped second fixing portions 81d that are connected to each of the support surface portions 81b and fixed to the side surface 62a of the cross member 6 by welding.

[0030] In the first bracket 8 of this embodiment, each first fixing portion 81c is welded and fixed to the flange surface 63a of the cross member 6, and each second fixing portion 81d is welded and fixed to the vehicle front side surface 62a of the cross member 6. In other words, in this embodiment, the first bracket 8 is fixed to both the vehicle front side surface 62a and the flange surface 63a of the cross member 6, and the second position P2 has a width.

[0031] 9, the rear fastening portion 75 of the second bracket 7 that is fastened to the first bracket 8 has a joint surface portion 76 that is joined to the base surface portion 81a of the first bracket 8, a bolt hole 77 formed in the joint surface portion 76, and a platform portion 78 that is welded to an area centered on the bolt hole 77 on the upper surface of the joint surface portion 76. For convenience, the bolt portion 82 is omitted from the illustration in FIG.

[0032] The platform portion 78 has three legs 78a, 78b, and 78c that stand substantially vertically from the joint surface 76, and a top surface 78d located above the legs 78a to 78c. The platform portion 78 has a substantially rectangular box shape, with the top surface 78d corresponding to the top surface of the box and the legs 78a to 78c corresponding to the three side surfaces of the box. While the platform portion 78 illustrated in FIG. 9 is open toward the rear of the vehicle, legs that form side surfaces may also be provided toward the rear of the vehicle, or legs that form two opposing side surfaces (e.g., legs 78a and 78c) may also be provided as long as rigidity is ensured.

[0033] In the fixing structure of this embodiment, the upper surface 78e of the top surface portion 78d of the platform portion 78 is flat, and its height position is set to be the same or nearly the same as the height position of the upper surface 61a of the cross member 6. Furthermore, the upper surface 78e and the upper surface 61a are set to be parallel to each other. Therefore, the rear end of the second bracket 7 is provided with the upper surface portion 78e of the top surface portion 78d as a flat portion that is flush or nearly flush with the upper surface 61a of the cross member 6.

[0034] When fastening the second bracket 7 to the first bracket 8, the bolt portion 82 of the first bracket 7 is inserted into the bolt hole 77 and protrudes above the joint surface portion 76, and a nut (not shown) is fastened to the protruding bolt portion 82. At this time, a tool insertion hole 79 is formed in the top surface portion 78d so that a fastening tool can be inserted into the internal space of the platform portion 78.

[0035] [2. Actions and Effects] (1) In the above-described fixing structure, the position (first position P1) where the seat 2 (e.g., the front seat 2) is fixed to the cross member 6 is different from the position (second position P2) where the battery 3 is fixed to the cross member 6, which makes it easier to avoid stress concentration on the cross member 6 during a vehicle collision. Therefore, without adding a reinforcing structure to the cross member 6, it is easier to ensure the strength of the seat fixing portion (e.g., the rear leg portion 22a) during a collision, and it is also easier to improve the effect of suppressing deformation of the battery 3 during a collision (particularly a side collision).

[0036] Furthermore, the second position P2 at which the battery 3 is fixed to the cross member 6 is located lower than the first position P1 at which the seat 2 is fixed to the cross member 6, so that the members for fixing the battery 3 can be prevented from protruding upward from the upper surface 61a of the cross member 6. This makes it easier to ensure legroom below the seat 2 for an occupant sitting in a seat behind the seat 2, as shown in Figure 10.

[0037] (2) The second position P2 is set on at least one of the side surface 62a and flange surface 63a on the vehicle front side of the cross member 6. This arrangement allows the battery fixing portion on the vehicle rear side of the battery 3 (in the above embodiment, the fastening portion 75 at the rear of the second bracket 7 and the first bracket 8) to be located in a position that is easily accessible to the cross member 6, thereby simplifying the fixing structure. In addition, it is possible to prevent the battery fixing portion from protruding upward from the upper surface 61a of the cross member 6.

[0038] (3) The rear end of the second bracket 7 is provided with an upper surface 78e of the fastening portion 75, which is a flat surface that is flush or nearly flush with the upper surface 61a of the cross member 6. Therefore, as shown in FIG. 10, for example, rear seat passengers can place their feet on these surfaces 61a, 78e. In other words, even if passengers place their feet below the seat 2, they can place their feet comfortably. Note that the dashed line in FIG. 10 indicates the upper surface of the floor carpet 10 that is laid above the floor panel 4.

[0039] (4) Because the two flange-shaped first fixing portions 81c of the first bracket 8 are welded and fixed to the flange surface 63a of the cross member 6, the first bracket 8 can be pre-positioned and fixed to the cross member 6 for assembly. This makes it easier to achieve positioning accuracy for the first bracket 8 and improves the ease of assembling the battery 3 to the vehicle.

[0040] (5) The first bracket 8 has the flange-shaped second fixing portion 81d connected to each support surface portion 81b and welded to the side surface 62a of the cross member 6, which increases the rigidity and strength of the first bracket 8 itself. In addition, the mounting rigidity and strength of the first bracket 8 to the cross member 6 can be increased, making it easier to ensure the rigidity and strength required to mount the battery 3.

[0041] [3. Modifications] The above-described fixing structure is merely an example and is not limited to the above. For example, in the above embodiment, the first bracket 8 is fixed to both the side surface 62 a and the flange surface 63 a on the vehicle front side of the cross member 6. However, as long as the mounting rigidity and mounting strength can be ensured, the first bracket 8 may be fixed only to the flange surface 63 a or only to the side surface 62 a.

[0042] Furthermore, the specific shapes of the first bracket 8 and the second bracket 7 are not limited to those in the above embodiment. For example, the first bracket 8 is formed by bending a metal plate of a predetermined shape and has a base surface portion 81a and two support surface portions 81b formed by bending downward from both sides in the extension direction of the base surface portion 81a, but the number of support surface portions 81b may be increased. Note that the first bracket 8 may be omitted, and the rear end of the battery 3 may be directly fixed to the cross member 6.

[0043] Regarding the second bracket 7, for example, the shape of the platform portion 78 provided on the rear fastening portion 75 does not have to be as described above, or the platform portion 78 may be omitted. It is preferable that the rear end of the second bracket 7 has a flat portion that is flush or nearly flush with the upper surface 61a of the cross member 6, but this flat portion is not essential. Furthermore, the second brackets 7 do not have to be a pair on the left and right of the battery 3, and their shape does not have to be hat-shaped in side view. The structure for mounting and fixing the battery 3 on the vehicle does not have to be the structure in which the battery module 30 is suspended, as described above, or the second bracket 7 does not have to be connected to the top of the battery 3 and fixed to the cross member 6. For example, a bracket or other component may be attached to the side or bottom of the battery 3 to fix it to the cross member 6, or a fixing portion for fixing the battery 3 to the cross member 6 may be provided on the battery case itself without a bracket or the like.

[0044] The configuration of the vehicle floor panel 4 and the shapes of the cross members 5, 6 are also examples and are not limited to those described above. In addition, in the above embodiment, the fixing structure is applied to the portion where the rear end of the battery 3 and the rear legs 22a, 22b of the front seat 2 are fixed to the cross member 6, but it may also be applied to the portion where the rear end of the battery 3 and the rear legs of the second-row seats are fixed to the cross member, for example.

[0045] The present invention is applicable to the vehicle manufacturing industry in which a battery and a seat are fixed to a cross member, and also to the vehicle manufacturing industry in which a frame including a cross member is provided.

[0046] DESCRIPTION OF SYMBOLS 1 Vehicle compartment 2, 2A, 2B Front seat (seat) 3 Driving battery 4 Floor panel 6 Intermediate cross member (cross member) 7 Battery fixing bracket (second bracket, battery fixing portion) 8 Cross member side bracket (first bracket, battery fixing portion) 22a, 22b Rear leg portion 61 Top wall portion 61a Top surface of top wall portion (top surface of cross member) 62 Standing wall portion 62a Surface of standing wall portion (side surface of cross member on the front side of the vehicle) 63 Flange portion 63a Top surface of flange portion (flange surface) 81 Bracket body 81a Base surface portion 81b Support surface portion 81c First fixing portion 81d Second fixing portion 82 Bolt portion P1 First position P2 Second position

Claims

DEPCT661. Seat and battery mounting structure for securing the seat arranged inside the vehicle and the power battery arranged under the seat with cross-sectional panels arranged on the floor panel and with a cap-shaped cross-sectional area, where the power battery incorporates the battery module and the battery box containing the battery module. The cross-sectional panel is composed of flange surfaces formed by bending the lower end of the side surface of the cross-sectional panel facing the front of the vehicle and welded to the floor panel. The seat is secured to position one of the upper surface of the cross-sectional panel. The rear legs of the seat and the battery mounting bracket of the power battery, which is placed on the rear of the vehicle, are secured to the cross-sectional panel. The power battery is secured to position two of the cross-sectional panel, position two lower than position one. Position two is set on at least one of the side surfaces and flange surfaces. The battery mounting bracket is composed of a first support that is secured to position two of the cross-sectional panel.and the second support which is connected to the battery box and has one end attached to the first support, the battery clamp which secures the battery to the cross part with the first and second supports and one end of the second support has a flat surface that is flush or nearly flush with the top surface of the cross part.

2. Structure according to claim 1, where the first support consists of the main support which consists of two flanged first-section fasteners separated from each other and connected to the flange surfaces, the base surface which is placed between the two first-section fasteners and above the first-section fasteners and parallel to the flange surfaces and two support surfaces which connect one side of the base surface to each first-section fastener and a nut which protrudes upwards from the base surface.

3. Structure according to claim 2, where the first support consists of a second fastener which is connected to each support surface and which is connected to the side surfaces of the cross part.