JP2013248945A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessive deformation of a frame member as much as possible.SOLUTION: A vehicle seat is configured in such a manner that a part or the whole of a frame member 6F is a hollow cylinder and that a middle of the frame member 6F is deformed into a curved or bent shape different from a linear shape. A portion in a deformed section (R1) of the frame member 6F is provided with a bellows 40 where the surface of the frame member 6F is corrugated.

Description

  The present invention relates to a vehicle seat provided with a metal frame member (hollow cylindrical shape) forming a seat outer shape.

As this type of vehicle seat, a vehicle seat including a seat cushion and a seat back is known (see Patent Document 1).
The seat back is a member that is connected to the seat cushion so as to stand upright, and includes a metal frame member (arch-shaped frame) that forms a seat skeleton. This frame member is a hollow member (substantially rectangular in cross-sectional view), and is formed, for example, by forming a planar metal member into a hollow cylindrical shape and then bending it into an arch shape.

Japanese Utility Model Publication No. 5-68353

By the way, in this kind of frame member, by deforming into an arch shape (bending), stress in the expansion direction is applied to the outside of the member and stress in the contraction direction is applied to the inside (peripheral length difference is generated). The frame member (material) tends to use a relatively hard metal from the viewpoint of improving the durability of the sheet. For this reason, in the configuration of the known technology, as the frame member becomes hard, excessive deformation (inner dent deformation or outer rupture) may occur due to a difference in circumference.
The present invention has been devised in view of the above points, and an object of the present invention is to prevent excessive deformation of the frame member as much as possible.

As means for solving the above-described problems, the vehicle seat of the first invention includes a seat constituent member such as a seat cushion or a seat back, and the seat constituent member includes a frame member forming a seat skeleton.
In the present invention, a part or all of the frame member has a hollow cylindrical shape, and the middle of the frame member is deformed into a shape different from a linear shape such as a curved deformation or a bending deformation. In this type of seat configuration, it is desirable that excessive deformation of the frame member can be prevented as much as possible.
Therefore, in the present invention, the bellows portion having the uneven surface of the frame member is provided in the deformed portion of the frame member. In the present invention, excessive deformation of the frame member can be prevented as much as possible by extending the bellows part according to the curvature or bending deformation of the frame member (absorbing the circumference difference).

  The vehicle seat of the second invention is the vehicle seat of the first invention, wherein the frame member is formed into a hollow cylindrical shape after providing a bellows portion on a plurality or a single planar metal member (bellows bellows). Part is relatively easy to form).

  According to the first aspect of the present invention, excessive deformation of the frame member can be prevented as much as possible. According to the second invention, the deformation of the frame member can be prevented as much as possible with a simple configuration.

It is a perspective view of a vehicle seat. It is a perspective view of a frame member. It is a perspective view of a part of metal member. (A) is a perspective view of a part of a frame member in the middle of molding, and (b) is a perspective view of a part of the frame member after bending.

Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. In each figure, a reference symbol F is attached to the front of the vehicle seat, a reference symbol B to the rear of the vehicle seat, a reference symbol UP to the upper side of the vehicle seat, and a reference symbol DW to the lower side of the vehicle seat.
The vehicle seat 2 in FIG. 1 has a seat cushion 4, a seat back 6, and a headrest 8. Each of these seat constituent members includes a frame member (4F, 6F, 8F) that forms a seat skeleton, a cushion material (4P, 6P, 8P) that forms the outer shape of the seat, and a skin material (4S, 6S, 8S).
Here, the headrest 8 is a member attached to the upper portion of the seat back 6, and has a basic configuration (8F, 8P, 8S) and a pair of stay members 8a. Each of the pair of stay members 8a is a rod-shaped member (cylindrical), and protrudes from the lower portion of the headrest 8 with a predetermined interval.

[Seatback]
The seat back 6 has a basic configuration (6F, 6P, 6S) and a support bracket 10 (refer to FIGS. 1 and 2 to be described later for details of each member).
Here, the frame member 6F (details will be described later) is an arch-like (front view) frame body including a plurality of deformation portions R1 to R4, and is a member formed by forming a planar metal member 30 into a hollow cylindrical shape. Yes (see FIG. 2 and FIG. 3).
In this embodiment, the headrest 8 is attached to the upper portion of the seat back 6 by inserting the stay member 8a through the support bracket 10 on the upper portion of the frame member 6F. For this reason, the frame member 6F has a predetermined rigidity, but in this type of configuration, consideration should be given so that the frame member 6F (deformation part) does not deform excessively.
Therefore, in this embodiment, excessive deformation of the frame member 6F is prevented as much as possible by the configuration described later. Hereinafter, each configuration will be described in detail.

(Frame member)
The frame member 6F is an arch-shaped (substantially inverted U-shaped) frame body, and includes an upper frame portion 6a and a pair of side frame portions 6b (see FIGS. 2 to 4, a method of forming the frame member 6F) Will be described later). And the frame member 6F of a present Example has several deformation | transformation part R1-R4, a pair of fitting part 6c, and the closure part 36 (after-mentioned).
The upper frame portion 6a is a portion extending in the seat width direction and constitutes the upper portion of the frame member 6F. The pair of side frame portions 6b are portions extending in the vertical direction of the seat on the basis of the standing state, and constitute side portions of the frame member 6F.
Further, the plurality of deformation portions (first deformation portion R1 to fourth deformation portion R4) are all deformation portions of the frame member 6F. The first deformation portion R1 and the second deformation portion R2 are portions that are bent up and down in the seat, and can be formed on both upper sides (between the upper frame portion 6a and the side frame portion 6b) of the frame member 6F. The third deformation portion R3 and the fourth deformation portion R4 are portions that bend toward the front of the seat, and can be formed in the middle of each side frame portion 6b.
The pair of fitting portions 6c are notched (or hole-like) portions into which the support bracket 10 can be fitted, and can be provided on the upper frame portion 6a (see FIGS. 2 and 4B). reference). In the present embodiment, the pair of fitting portions 6c can be formed in the upper frame portion with a predetermined interval (clearance corresponding to the gap between the pair of stay members 8a).

(Support bracket)
The support bracket 10 (substantially rectangular) is a metal member typically having rigidity, and can be fixed to the frame member 6F via the fitting portion 6c (see FIG. 2).
The support bracket 10 has insertion holes 10H into which a pair of stay members 8a can be inserted (see FIG. 1). In this embodiment, each stay member 8a can be inserted into the support bracket 10 (insertion hole 10H) via a support member 8b (tubular member).

(Bellows part)
The bellows portion 40 is a portion where the surface of the frame member 6F is uneven, and can be expanded and contracted according to deformation (curvature deformation or bending deformation) of the frame member 6F (see FIG. 4).
The shape of the bellows portion 40 is not particularly limited, but may be various shapes such as a wave shape, a concave shape (substantially rectangular shape), and a zigzag shape (substantially triangular shape) of the present embodiment.
And the bellows part 40 can be provided in a part (deformation part corresponding to the formation position of each deformation | transformation part) of the frame member 6F.

[Create frame member]
In the present embodiment, the planar metal member 30 is formed into a hollow cylindrical shape to create the frame member 6F (see FIGS. 2 to 4).
Here, the metal member 30 is a planar member that follows the unfolded shape of the frame member 6F, and has a plurality of broken line portions 32 (in FIG. 4, for convenience, only some broken line portions are denoted by reference numerals). The plurality of broken line portions 32 are linear dent portions on the surface of the metal member 30, and are portions serving as folding margins when the metal member 30 is bent and deformed. Here, the material of the metal member 30 is not particularly limited, but is preferably a metal that can be plastically deformed, and examples include metals such as steel (stainless steel, etc.), aluminum alloy, magnesium alloy, and titanium alloy. Further, the material of the metal member 30 is preferably a material excellent in strength (rigidity), and a high-tensile steel plate (980 Mpa high-tensile material) having a tensile strength of 980 Mpa or more can be exemplified.

(Formation of bellows and fitting part)
In the present embodiment, the bellows portion 40 and the fitting portion 6c can be provided on the metal member 30 (see FIGS. 3 and 4).
For example, the metal member 30 is partially uneven, and the bellows portion 40 is provided at a portion corresponding to the inner surface side (third surface 30C described later) of the first deformation portion R1 and the second deformation portion R2. Although the formation method of the bellows part 40 is not specifically limited, Press work, such as a punch mechanism and a press board, can be illustrated.
In the present embodiment, a pair of fitting portions 6c (substantially rectangular through holes) are formed at a predetermined interval in a part of the metal member 30 (in FIG. 4B, one fitting portion for convenience). Only 6c is shown). At this time, the fitting portion 6c (substantially rectangular through-hole) can be formed in a portion corresponding to the middle of the upper frame portion 6a (first surface 30A described later). Although the formation method of the insertion part 6c (hole part) is not specifically limited, Press work and optical processes, such as a laser, can be illustrated. Thus, by forming the fitting part 6c with respect to the metal member 30 (plane shape), it can avoid as much as possible that the frame member 6F is dented too much in press work etc., for example.
In the present embodiment, the bellows portion 40 and the fitting portion 6c can be simultaneously formed on the metal member 30 with a single press plate or the like.

Next, the metal member 30 (planar shape) is bent at each broken line portion 32 to be formed into a hollow cylindrical shape (substantially rectangular in cross-sectional view) (see FIGS. 4A and 4B).
At this time, after the pair of end portions 34 of the metal member 30 are disposed so as to face each other (after the closing portion 36 is formed), the pair of end portions 34 are integrated. By doing so, the expansion of the closing portion 36 (deformation of the frame member 6F) is prevented as much as possible, and a reduction in rigidity due to the deformation of the frame member 6F can be avoided as much as possible.
Here, the method of integrating the end portions 34 is not particularly limited, and examples thereof include methods such as welding and adhesion. In addition, one end 34 is uneven, and the other end 34 is uneven. These both end portions 34 can be integrated with each other.

In this embodiment, the metal member 30 (hollow cylindrical shape) is bent into a substantially arch shape following the shape of the seat back 6 to form a plurality of deformed portions R1 to R4 (see FIG. 2). At this time, the first surface 30A to the fourth surface 30D are formed on the frame member 6F (substantially rectangular in cross-sectional view) (see FIGS. 3 and 4).
The first surface 30 </ b> A is a surface facing the seating side of the seat back 6, and the second surface 30 </ b> B is a surface facing the rear side of the seat back 6. The third surface 30 </ b> C is a surface (inner surface) facing the inner side of the seat back 6, and the fourth surface 30 </ b> D is a surface (outer surface) facing the outer side of the seat back 6.

In this type of seat configuration, from the viewpoint of securing the rigidity of the frame member 6F, excessive deformation of the frame member 6F should be prevented as much as possible during bending.
For example, in the present embodiment, in the first deformation portion R1 and the second deformation portion R2 (deformation portion), stress in the contraction direction is applied to the third surface 30C (inner surface) (see FIGS. 2 and 4B). ). In addition, there is a concern that the frame member 6F is excessively deformed by applying stress in the extending direction to the fourth surface 30D (outer surface) (peripheral length difference is generated).
Therefore, in the present embodiment, as described above, the bellows portion 40 is provided in a portion corresponding to the inner surface side (third surface 30C) of each of the deformation portions R1 and R2. Then, when bending the metal member 30 (hollow cylindrical shape), it is bent while considering that the fourth surface 30D (outer surface) is not stressed as much as possible. At the time of this bending, excessive deformation of the frame member 6F is caused by deforming the concave and convex shapes of the bellows portion 40 toward each other due to the stress in the contraction direction of the third surface 30C (by absorbing the circumferential length difference). It can be prevented as much as possible. For this reason, according to the present embodiment, excessive deformation of the frame member 6F can be prevented as much as possible by absorbing the circumferential length difference at the bellows portion 40.

Further, in this embodiment, the frame member 6F is bent and deformed to form a plurality of deformed portions (for example, the first deformable portion R1 and the second deformable portion R2) (see FIGS. 2 and 4). At this time, in the deformed portion, there is a concern that the closing portion 36 expands due to a difference in circumferential length between the third surface 30C (inner surface) and the fourth surface 30D (outer surface).
Therefore, in the present embodiment, the above-described closing portion 36 is formed on the first surface 30A (the surface on the seating side), so that it can be configured such that stress during deformation is not applied as much as possible (due to the occurrence of a circumferential length difference). Can be avoided as much as possible). Moreover, the rigidity reduction of the frame member 6F can be avoided as much as possible by forming the closing portion 36 at a position different from the bellows portion 40 (third surface 30C).

After the frame member 6F is formed in this manner, the stay member 8a can be inserted in each fitting portion 6c by being fixed by welding or the like while the support bracket 10 is fitted (FIGS. 1 and FIG. 1). 2).
Next, the cushion material 6P is disposed on the frame member 6F and covered with the skin material 6S (see FIG. 1). A pair of through holes (reference numerals omitted) are formed in the upper parts of the skin material 6S and the cushion material 6P, respectively, and the support bracket 10 can be exposed to the outside. The headrest 8 can be attached to the upper portion of the seat back 6 by inserting the pair of stay members 8a into the corresponding support brackets 10 respectively.

As described above, in this embodiment, the bellows portion 40 is provided in the deformed portion (R1, R2) of the frame member 6F. And the bellows part 40 expand | extends according to a deformation | transformation of the frame member 6F (absorbing a circumference difference), and an excessive deformation | transformation of the frame member 6F can be prevented as much as possible.
In this embodiment, the frame member 6F is formed into a hollow cylindrical shape after the bellows portion 40 is provided on a single planar metal member 30 (the bellows portion 40 is relatively easy to form).

The seat back 6 of the present embodiment is not limited to the above-described embodiment, and can take other various embodiments.
(1) In the present embodiment, the configuration (shape, dimension, number of formations) of the bellows portion 40 is exemplified, but the configuration of the same portion can be appropriately changed according to the sheet configuration. For example, in this embodiment, the bellows portion is formed on the third surface. The bellows portion is preferably formed on at least one of the third surface and the fourth surface, and can be formed on all of the first surface to the fourth surface. Further, the bellows portion and the closing portion can be formed on the same surface. In the present embodiment, the example in which the bellows portions are provided in the first deformation portion and the second deformation portion has been described. The bellows part can be provided in at least one of the first deformation part to the fourth deformation part. For example, a bellows portion can be provided on the rear surface (second surface) or the like of the third deformation portion or the fourth deformation portion.

(3) In the present embodiment, the frame member 6F having a substantially rectangular shape (sectional view) is illustrated, but the cross-sectional shape of the frame member 6F is a circular shape such as a circular shape or an elliptical shape, a rectangular shape, a triangular shape, or the like. Various shapes such as a polygonal shape can be taken.
Moreover, in this embodiment, although the whole frame member 6F was shape | molded in the hollow cylinder shape, it is not the meaning which limits the structure of the frame member 6F. For example, the upper frame portion 6a can be formed into a hollow cylindrical shape, and the side frame portion 6b can be formed into a flat plate shape. Further, the frame member may be a hollow cylindrical member having a closing portion (a joint) or a hollow cylindrical member having no joint.
The frame member can have a plurality of or a single deformable portion. The shape of the deformable portion can take various shapes such as a bent shape (L shape such as the first deformable portion, a crank shape, etc.) and a curved shape (such as a gently curved shape such as the third deformable portion).

(4) Moreover, in this embodiment, the example which arrange | positions a pair of edge parts 34 of the metal member 30 facing each other was demonstrated. Unlike this, it is also possible to place a pair of end portions in contact with each other. In this way, the closing portion can be more firmly integrated by welding while overlapping the end portions.
(5) Moreover, in this embodiment, the example using the single metal member 30 was demonstrated. Alternatively, the pair of metal members 30 (planar shape) can be bent into a substantially U shape and then integrated into a hollow cylindrical shape (substantially rectangular shape in cross-sectional view).
(6) In the present embodiment, the seat back 6 has been described as an example, but the configuration of the present embodiment can be applied to various seat components such as the seat cushion 4.

2 Vehicle seat 4 Seat cushion 6 Seat back 8 Headrest 6P Cushion material 6F Frame member 6S Skin material 6a Upper frame part 6b Side frame part 6c Insertion part 8a Stay member 10 Support bracket 30 Metal member 34 End part 36 Closure part 38 Shaft part 40 bellows part R1-R4 deformation part

Claims (2)

While having a seat constituent member such as a seat cushion or a seat back, the seat constituent member includes a frame member forming a seat skeleton, and a part or all of the frame member is a hollow cylindrical shape, and the middle of the frame member However, in a vehicle seat configured to be deformed into a shape different from a linear shape such as curved deformation or bending deformation,
A vehicle seat in which a deformed portion of the frame member is provided with a bellows portion having an uneven surface on the surface of the frame member. 2. The vehicle seat according to claim 1, wherein the frame member is formed into a hollow cylindrical shape after a bellows portion is provided on a plurality or a single planar metal member.

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