JP7037972B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat.

As a vehicle seat mounted on a vehicle such as an automobile, a seat having a seat back that can be tilted with respect to a seat cushion is known. In such a vehicle seat, the seat back is rotatably and fixedly supported at the lower end portion, and is releasably fixed to the vehicle body at the widthwise end portion of the upper end portion (see, for example, Patent Document 1). ).

Japanese Patent No. 5966713

In a vehicle seat as described in Patent Document 1, since the upper end of the seat back is supported by a point, the strength member of the seat back is composed of a ribbed plate member in order to increase the rigidity of the seat back. It is not only done, but also reinforced with a pipe frame.

By the way, unlike the above-mentioned vehicle seat, in a structure that does not use a pipe frame, a large number of beads protruding from the front surface or the back surface of the plate member may be provided in order to reinforce the plate member of the seat back. In the case of such a structure, the rigidity is insufficient at the longitudinal end of the bead, which may be the starting point of deformation of the plate member.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle seat capable of preventing the plate member of the seat back from being deformed at the longitudinal end portion of the bead.

The vehicle seat of one aspect of the present invention includes a seat cushion and a seat back fixed to the body of the vehicle, and the seat back has a plate-shaped first member and one side in the thickness direction of the first member. A second member having a cross-sectional shape of a hat with which a flange portion comes into contact with the first member, and a central bead provided at the center of the first member, and in a plan view along the thickness direction of the first member, said. The second member and the longitudinal end of the central bead overlap, and the first member is formed with the central bead so as to rise toward the second member, and the second member is formed. A tunnel portion is provided in a part of the flange portion and the vertical wall portion of the second member corresponding to the central portion bead .

According to the present invention, it is possible to provide a vehicle seat capable of preventing the plate member of the seat back from being deformed at the longitudinal end portion of the bead.

It is a perspective view which shows the rear seat as a vehicle seat of this invention. It is a front view which looked at the back frame of a seat back from the front. (A) is a cross-sectional view showing a state in which the second member is attached to the flat surface portion of the first member, and (B) is a cross-sectional view at a position where the central bead extends to the inside of the second member. It is a front view of the back frame which see through the 2nd member. It is an exploded perspective view of a back frame. It is sectional drawing which shows the accommodating bead provided in the 1st member, and the 2nd member accommodating the accommodating bead. It is an exploded perspective view of the right back frame. It is a front view of the left back frame in the vehicle seat of the 2nd Embodiment of this invention. It is a front view of the back frame which shows the state which the plate member is interposed between the 1st member and the 2nd member corresponding to the shaft part in the vehicle seat of 3rd Embodiment of this invention.

(First Embodiment)
FIG. 1 shows the entire vehicle seat 10 for explaining an embodiment of the present invention.
In the following description, the front side of the vehicle is "front", the rear side of the vehicle is "rear", the right side is "right", the left side is "left", the upper side is "upper", and the lower side toward the front of the vehicle. Will be indicated as "below".

In FIG. 1, for example, the rear seat (second row) of a passenger car is shown as a vehicle seat 10. The vehicle seat 10 has a seat cushion 20 mounted on a body 100 of an automobile or the like and mainly capable of seating an occupant, and a seat back 30 for supporting the back of the seated occupant.

The seat cushion 20 is a bench seat integrated in the vehicle width direction (left-right direction), has a cushion frame (not shown) and a cushion material provided on the cushion frame (not shown), and has a surface made of fiber or leather. Is covered with a cushion skin 21 such as. The seat cushion 20 is attached to the floor F of the body 100.
The seat cushion 20 may be split into left and right parts.

As shown in FIG. 2, the seat back 30 is a split type that can be divided into left and right, and has a right seat back 30R and a left seat back 30L. The ratio of the lengths of the right seat back 30R and the left seat back 30L in the left-right direction will be described here in the case of 4: 6, but the ratio is not limited to this, and is, for example, 6: 4 or 5: 5. You may.

The seat back 30 has a plate-shaped back frame 40 and a cushion material (not shown) attached to the front side of the back frame 40, and its surface is covered with a back skin 31 such as fiber or leather (Fig.). 1).
In the following description, the same reference numerals are given to the common parts, but in particular, when distinguishing the right seat back 30R and the left seat back 30L, “R” and “L” are added to distinguish them, respectively. I decided to. Further, with the seat back 30 upright, the upper side is displayed as "upper" and the lower side is displayed as "lower side".

Shafts (second connection part, hinge part) 41 and shaft parts (third connection part, 3rd connection part, at both lower left and right ends of the right back frame 40R constituting the right seat back 30R and the left back frame 40L constituting the left seat back 30L A hinge portion) 42 is provided and is rotatably supported by a bearing portion 101 provided on the body 100.
The bearing portion 101 may be provided with a reclining device capable of tilting and fixing the seat back 30 with respect to the seat cushion 20 at a desired angle.

Further, at the outer end portion in the width direction of the body 100 at the upper ends of the right back frame 40R and the left back frame 40L, a seat back fixing portion (first connection portion) 43 for fixing the back frames 40R and 40L to the body 100 is provided. Are provided respectively. Further, a headrest 32 is detachably attached to the upper side of each of the seat backs 30R and 30L (see FIG. 1), and a headrest attachment portion 44 for attaching the headrest 32 is attached to the upper part of each back frame 40R and 40L. Is provided.

As shown in FIG. 2, the back frame 40 has a plate-shaped first member 50 made of a metal plate having a thickness of, for example, 0.7 mm or less, and one side surface of the first member 50 in the thickness direction (here, a front surface (flat surface portion) 51). ), The second member 60 is made of a metal plate having a thickness of, for example, 0.7 mm or less.
Since the right back frame 40R and the left back frame 40L have the same structure, the left back frame 40L having a large area will be described in the following description unless it is particularly necessary.

The second member 60 is attached in a closed frame shape along the outer peripheral edge of the first member 50. As a result, the entire first member 50 can be reliably reinforced.
The shape is not limited to the frame shape, but can be provided in a C-shape or a shape in which a pair of C-shapes face each other.

As shown in FIGS. 3A and 3B, the second member 60 includes a flange portion 61 provided on both sides, a pair of vertical wall portions 62 rising from the inner edge of the flange portion 61, and a pair. It has a flat top plate (flat portion) 63 connecting the upper ends (front ends) of the vertical wall portion 62, and has a hat cross-sectional shape having a hollow portion 64 inside. The second member 60 is attached by welding so that the lower surface of the flange portion 61 comes into contact with the front surface 51 of the first member 50.

As shown in FIG. 2, when the left seat back 30L is used, the left back frame 40L is formed by a pair of left and right shaft portions 41 and 42 at the lower end portion and one seat back fixing portion 43 outside the width direction at the upper end portion. It is point-supported.

Therefore, an external force acts on the first member 50 in a bending direction in the virtual line (line) L1 connecting the seat back fixing portion 43 and the shaft portion 42 on the diagonal line. In order to resist this external force, a plurality of central bead 52s are provided in parallel in the central portion inside the second member 60 in the first member 50, and the central bead 52 is provided with the virtual line L1. It is provided parallel to the direction substantially orthogonal to. As a result, even when the left back frame 40L is connected at three points, the strength can be reliably secured.

The central bead 52 can be formed at the same time by pressing when the first member 50 is manufactured. The central bead 52 may have a cross section such as a partial arc shape or a trapezoid, and is formed so as to project toward the second member 60, that is, forward. As a result, since the central bead 52 does not protrude from the rear surface (the side surface opposite to the front surface 51) of the first member 50, a flat luggage compartment surface can be secured in a state where the seat back 30 is tilted and laminated on the seat cushion 20. ..

The central bead 52 has an overlapping portion 521 that overlaps with the second member 60 at the end portion in the longitudinal direction in a plan view along the thickness direction of the first member 50. That is, as shown in FIG. 3B, the second member 60 is provided with a tunnel portion 65 in a part of the flange portion 61 and the vertical wall portion 62 corresponding to the central portion bead 52, and the central portion. The bead 52 penetrates the tunnel portion 65 to form an overlapping portion 521. This makes it possible to prevent the first member 50 of the left back frame 40L from being deformed at the longitudinal end of the central bead 52.
In the tunnel portion 65, the overlapping portion 521 of the central bead 52 and the second member 60 are not joined by welding to relieve stress.

The overlapping portion 521 may be provided at both ends of the central bead 52, but as shown in FIG. 2, it can be provided only at one end. Further, the overlapping portion 521 can be provided in all the central bead 52, but here, it is provided in a part of the central bead 52.

Further, as shown in FIG. 3B, the overlapping portion 521 reaches the hollow portion 64 of the second member 60, but may not reach the hollow portion 64 and may reach the flange portion 61.
Although the overlapping portion 521 is not provided in the central bead 52 of the first member 50 of the right back frame 40R in FIG. 2, the overlapping portion 521 can be provided in the same manner as the left back frame 40L.

As shown in FIGS. 2 and 4, on the upper portion of the front surface 51 of the first member 50, a semicircular tongue-shaped portion in which the flange portion 61 of the second member 60 extends downward along the front surface 51 of the first member 50 is formed. A flange extension portion 611 is provided. The flange extension portion 611 is provided with a retractor fixing portion (fixing portion) 71 for attaching a retractor for winding up the seat belt or locking the seat belt in an emergency. Further, a belt guide portion 72 for guiding the seat belt is provided on the top plate 63 of the second member 60 corresponding to the upper part of the retractor fixing portion 71.

A surrounding bead 54 is provided in a semicircular shape along the flange extension portion 611 on the first member 50 outside the semicircular flange extension portion 611 of the second member 60. As a result, the first member 50 corresponding to the retractor fixing portion 71 is reinforced, so that it is possible to prevent the number of parts from increasing and the assembly man-hours from increasing, and to increase the strength of the retractor fixing portion 71. Further, since the retractor fixing portion 71 is attached to the first member 50 via the flange extension portion 611 of the second member, the strength of the retractor fixing portion 71 is further increased.

As shown in FIGS. 4 and 5, a plurality of accommodating beads 55 are provided in the hollow portion 64 of the second member 60 at a position covered by the second member 60 in the first member 50. (See Fig. 6). An interval S having a predetermined size is provided between the adjacent accommodation beads 55.

As a result, deformation of the accommodation bead 55 can be suppressed as compared with the case where the accommodation bead 55 is continuous.
As shown in FIG. 5, in the central bead 52a, the overlapping portion 521 is continuous with the accommodating bead 55a, but when the accommodating bead 55a is viewed along the installation direction of the second member 60, the accommodating bead 55a is adjacent to the accommodating bead 55a. A gap S is provided between the 55 and the 55, and the space S is separated from the 55.

As shown in FIG. 6, the accommodating bead 55 is formed so as to rise toward the second member 60, and has a flange portion 551, a vertical wall portion 552, and a flat surface portion 553. The flat surface portion 553 is provided with a through hole 554. A trim clip 74 for attaching the back skin 31 is attached to the through hole 554. At this time, the raised dimension H of the housing bead 55 is set to be larger than the thickness of the head 741 so that the head 741 of the trim clip 74 does not protrude toward the first member 50.
It is not necessary to provide the through hole 554 in the accommodating bead 55 located at a position (for example, the upper edge end portion of the first member 50) that is not necessary for attaching the back skin 31.

As shown in FIGS. 4 and 5, at the lower end of the first member 50, a plate member 80 is provided at a predetermined position so as to abut between or above the first member 50 and the second member 60. .. The thickness of the plate member 80 is larger than the plate thickness of the first member 50 and the second member 60 (for example, 0.7 mm or less), and can be, for example, about 1.2 to 5 mm. As a result, the predetermined portion of the first member 50 can be easily and surely reinforced.

As shown in FIGS. 4 and 5, on the right shaft portion 42 (see FIG. 2) where the largest load is applied to the first member 50, a flat plate-shaped second member is placed between the first member 50 and the second member 60. One plate member 81 is interposed. The first plate member 81 has an exposed portion 812 exposed to the outside from the flange portion 61 of the second member 60, and is on the side opposite to the second member 60 of the first member 50 corresponding to the exposed portion 812. A shaft portion 42 is provided. As a result, the shaft portion 42 can be firmly attached to the first member 50.

The first plate member 81 has an L-shape in a plan view, and has an internal space on the lower surface side in the center in the width direction in order to avoid interference with the accommodation bead 55 provided in the first member 50. The plate member bead 811 is provided so as to project toward the second member 60 side. As a result, it is possible to avoid interference with the accommodation bead 55 and increase the rigidity of the first plate member 81.

The first member 50, the second member 60, and the first plate member 81 can be welded at one time by laser welding or spot welding in a state where three sheets are stacked. As a result, the man-hours can be reduced to improve the work efficiency, and the first member 50, the second member 60, and the first plate member 81 can be reliably joined.

At this time, welding is performed from the first member 50 side, and when the second member 60 is joined through the first plate member 81, the welding conditions are adjusted so as not to penetrate the flange portion 61 of the second member 60. do.
It is possible to perform welding from the second member 60 side, but in this case, the first member 50 is prevented from penetrating. As the welding, for example, welding using a laser can be performed. Further, it is desirable that the welding is not continuously performed in the longitudinal direction along the flange portion 61 of the second member 60, but the non-welded portion is provided so as not to exceed a predetermined length.

As shown in FIGS. 2 and 5, a flat surface portion bead 66 is provided on the top plate 63 of the second member 60 at the position where the first plate member 81 is provided. The flat surface portion beads 66 are provided on both sides of the first flat surface portion bead 661 provided at positions corresponding to the corner portions of the second member 60 and the first plate member 81 and the first flat surface portion bead 661. It also has a second flat surface portion bead 662.

The first flat surface portion bead 661 is a convex bead protruding toward the surface side of the top plate 63, and is provided in a direction toward the corner portion of the second member 60. On the other hand, the second flat surface portion bead 662 is a concave bead protruding toward the inner surface side of the top plate 63, and is provided in a direction along the frame-shaped second member 60. In this way, the bead direction of the flat surface portion bead 66 is made uneven. In this way, the bead direction of the flat surface portion bead 66 is made uneven so as not to be constant. This makes it possible to reliably prevent breakage.

As shown in FIGS. 4 and 5, the surface of the front surface 51 of the first member 50, the surface of the flange portion 61 of the second member 60, and the surface of the vertical wall portion 62 corresponding to the left shaft portion 41 (see FIG. 2). , A crank-shaped second plate member 82 is provided along the surface of the top plate 63. On the surface of the second plate member 82, a plate member bead 821 that rises in a direction away from the first member 50 is provided. As a result, the rigidity of the entire FRM can be increased, and the first member 50 can be reliably reinforced.

The second plate member 82 has an exposed portion 822 exposed to the outside from the flange portion 61 of the second member 60, and is on the side opposite to the second member 60 of the first member 50 corresponding to the exposed portion 822. A shaft portion 41 is provided (see FIG. 2). As a result, the shaft portion 41 can be firmly attached to the first member 50.

FIG. 7 shows an exploded perspective view of the right back frame 40R. Since the right back frame 40R has a smaller dimension in the left-right direction than the left back frame 40L, a large force is not applied as in the shaft portion 42 of the left back frame 40L. Therefore, in the right back frame 40R, the same structure as the shaft portion 41 in the left back frame 40L is used for both the left and right ends at the lower end portion.

Therefore, in FIG. 7, the same reference numerals are given to the same structures as the left back frame 40L shown in FIG. 5, and duplicate description will be omitted.
The central bead 52 provided on the first member 50 of the right back frame 40R is provided in a direction intersecting or orthogonal to the virtual line L2 (see FIG. 2).

(Second Embodiment)
FIG. 8 shows a front view of the left back frame 40L in the vehicle seat 11 of the second embodiment of the present invention.
In the following description, the same reference numerals will be given to the parts common to the vehicle seat 10 of the first embodiment described above, and duplicate description will be omitted.

As shown in FIG. 8, in the left back frame 40L of the vehicle seat 11 of the second embodiment, the second member extension portion 67 in which the central portion in the left-right direction at the upper end portion of the second member 60 is extended downward in a U shape. Is provided. The second member extension portion 67 has an extension surface 671 on the inner side (center portion) on the same surface as the flange portion 61, and the retractor fixing portion 71 is attached to the extension surface 671. Further, on the outside of the extension surface 671, an extension vertical wall portion 672 similar to the vertical wall portion 62 of the second member 60 is provided, and an extension top plate 63 is extended at the upper end of the extension vertical wall portion 672. The plate 673 is provided in a U shape.

That is, the retractor fixing portion 71 is surrounded by the extended vertical wall portion 672 and the extended top plate 673 of the second member 60 in place of the surrounding bead 54 of the first member 50 described above. As a result, the retractor fixing portion 71 can be reliably protected and can be provided at the same time as the second member 60 is molded, so that the number of parts can be reduced.

(Third Embodiment)
FIG. 9 shows a front view of a main part of the left back frame 40L in the vehicle seat 12 of the third embodiment of the present invention.
In the following description, the same reference numerals will be given to the parts common to the vehicle seat 10 of the first embodiment and the vehicle seat 11 of the second embodiment described above, and duplicate description will be omitted. do.

As shown in FIG. 9, in the left back frame 40L of the left seat back 30L of the vehicle seat 12 of the third embodiment, the vehicle seat 10 of the first embodiment and the vehicle seat 11 of the second embodiment described above are used. The third plate member 83 was provided as the plate member 80 in place of the second plate member 82 provided corresponding to the shaft portion 41 (see FIG. 2). Unlike the second plate member 82, the third plate member 83 has a flat plate shape, and the third plate member 83 is interposed between the first member 50 and the second member 60.

The surface of the third plate member 83 is provided with a plate member bead 831 that rises in a direction away from the first member 50 (that is, forward), and the plate member bead 831 projects toward the second member 60. The flange portion 61 and the vertical wall portion 62 of the second member 60 corresponding to the plate member bead 831 are provided with notches and recesses so as not to interfere with each other.

Further, an exposed portion 832 exposed from the second member 60 is provided at a position corresponding to a corner portion of the first member 50 in the third plate member 83, and the first member 50 corresponding to the exposed portion 832 is provided. A shaft portion 41 is provided on the side opposite to the two member 60 (see FIG. 2).
The third plate member 83 is formed by laser welding or spot welding at a time with the first member 50, the second member 60, and the third plate member 83 stacked in the same manner as the first plate member 81 described above. Can be welded.

Even with this configuration, the same effect as the vehicle seat 10 of the first embodiment described above can be obtained.

Although the sheets 10, 11 and 12 of the present invention have been described above based on specific embodiments, the present invention is not limited to the specific embodiments described above, and the technical idea of the present invention is not limited to the above-mentioned specific embodiments. Needless to say, various modifications and improvements may be made within a range that does not deviate from the above.
For example, in the above-described embodiment, the passenger car has been described, but the same applies to other vehicles.

As described above, the vehicle seat disclosed in the present specification includes a seat cushion and a seat back fixed to the body of the vehicle, and the seat back includes a first member formed in a plate shape and the above. It has a second member having a hat cross-sectional shape in which a flange portion contacts one surface in the thickness direction of the first member, and a central bead provided in the central portion of the first member, in the thickness direction of the first member. In a plan view along, the second member and the longitudinal end of the central bead overlap.

Further, in the vehicle seat disclosed in the present specification, the central bead is formed so that the first member is raised toward the second member, and the second member is formed on the central bead. Correspondingly, a tunnel portion is provided in a part of the flange portion and the vertical wall portion of the second member.

Further, in the vehicle seat disclosed in the present specification, the flat surface portion of the first member and the flange portion of the second member are mutually fixed.

Further, the vehicle seat disclosed in the present specification has a first connection portion for detachably connecting the upper part of the first member in the forward direction side of the vehicle in the body, and the vehicle in the body. In order to rotatably connect the lower part of the first member to the second connecting part adjacent to the second connecting part and to rotatably connect the lower part of the first member in the forward direction side of the above. The central bead is along a line that intersects or is orthogonal to the line connecting the first connection and the third connection.

Further, in the vehicle seat disclosed in the present specification, the second member has a plan view frame shape.

As described above, the vehicle seat disclosed in the present specification includes a seat cushion and a seat back fixed to the body of the vehicle, and the seat back includes a first member formed in a plate shape and the above. It has a second member having a hat cross-sectional shape in which a flange portion contacts one surface in the thickness direction of the first member, and a fixing portion that is supported by one of the first member and the second member and can fix a retractor. A surrounding bead surrounding the fixed portion is provided on one of the first member and the second member in a plan view along the stacking direction of the first member and the second member.

Further, in the vehicle seat disclosed in the present specification, the surrounding bead is provided on the first member.

Further, in the vehicle seat disclosed in the present specification, the surrounding bead is continuous with the second member.

Further, the vehicle seat disclosed in the present specification can be attached to and detached from the central bead provided in the central portion of the first member and above the first member in the forward direction side of the vehicle in the body. A first connection portion for connecting to the second connection portion, a second connection portion for rotatably connecting the lower portion of the first member in the forward direction side of the vehicle in the body, and a second connection portion adjacent to the second connection portion. It has a third connecting portion for fitting and rotatably connecting the lower portion of the first member, and the central bead intersects the line connecting the first connecting portion and the third connecting portion. Or along an orthogonal line.

Further, in the vehicle seat disclosed in the present specification, the second member has a plan view frame shape.

As described above, the vehicle seat disclosed in the present specification includes a seat cushion and a seat back fixed to the body of the vehicle, and the seat back includes a first member formed in a plate shape and the above. It has a second member having a hat cross-sectional shape in which a flange portion comes into contact with one surface in the thickness direction of the first member, and a plurality of accommodating beads provided at positions covered by the second member in the first member. In a plan view along the stacking direction of the first member and the second member, the accommodation beads are provided at predetermined intervals along the continuous direction of the second member.

Further, in the vehicle seat disclosed in the present specification, the accommodating bead is formed so as to be raised toward the second member, and a through hole is provided in a flat surface portion of the accommodating bead.

Further, the vehicle seat disclosed in the present specification can be attached to and detached from the central bead provided in the central portion of the first member and above the first member in the forward direction side of the vehicle in the body. A first connection portion for connecting to the second connection portion, a second connection portion for rotatably connecting the lower portion of the first member in the forward direction side of the vehicle in the body, and a second connection portion adjacent to the second connection portion. It has a third connecting portion for fitting and rotatably connecting the lower portion of the first member, and the central bead intersects the line connecting the first connecting portion and the third connecting portion. Or along an orthogonal line.

Further, in the vehicle seat disclosed in the present specification, the second member has a plan view frame shape.

As described above, the vehicle seat disclosed in the present specification includes a seat cushion and a seat back fixed to the body of the vehicle, and the seat back includes a first member formed in a plate shape and the above. A vehicle seat having a second member having a hat cross-sectional shape in which a flange portion contacts one surface in the thickness direction of the first member, and a plate member provided between the first member and the second member.

Further, in the vehicle seat disclosed in the present specification, the plate member is interposed between the flat surface portion of the first member and the flange portion of the second member.

Further, the vehicle seat disclosed in the present specification is provided with a flat surface portion bead at a position corresponding to the plate member in the flat surface portion of the second member.

Further, in the vehicle sheet disclosed in the present specification, the flat surface portion of the first member, the flange portion of the second member and the plate member are integrally welded along the thickness direction of the plate member. ing.

Further, in the vehicle seat disclosed in the present specification, the plate member has an exposed portion exposed to the outside from the flange portion of the second member, and the first member has a portion corresponding to the exposed portion. In addition, a hinge portion is provided on the side opposite to the second member.

Further, in the vehicle seat disclosed in the present specification, the plate member is formed along the surface of the flat surface portion of the first member and the flange portion of the second member, the surface of the vertical wall portion, and the surface of the flat surface portion. Have been placed.

Further, in the vehicle seat disclosed in the present specification, the plate member is provided with a plate member bead that rises in a direction away from the first member.

Further, in the vehicle seat disclosed in the present specification, the first member is provided with a hinge portion on the plane portion along which the plate member is aligned and on the opposite side of the second member.

Further, the vehicle seat disclosed in the present specification can be attached to and detached from the central bead provided in the central portion of the first member and above the first member in the forward direction side of the vehicle in the body. A first connection portion for connecting to the second connection portion, a second connection portion for rotatably connecting the lower portion of the first member in the forward direction side of the vehicle in the body, and a second connection portion adjacent to the second connection portion. It has a third connecting portion for fitting and rotatably connecting the lower portion of the first member, and the central bead intersects the line connecting the first connecting portion and the third connecting portion. Or along an orthogonal line.

Further, in the vehicle seat disclosed in the present specification, the second member has a plan view frame shape.

10, 11, 12 Vehicle seat 20 Seat cushion 30 Seat back 41 Shaft (second connection)
42 Shaft (3rd connection)
43 Seat back fixing part (first connection part)
50 First member 51 Rear surface (flat surface portion of the first member)
52 Central bead 60 Second member 61 Flange part 62 Vertical wall part 65 Tunnel part 101 Body L1, L2 Virtual line (connecting line)

Claims (4)

Equipped with a seat cushion and seat back that are fixed to the body of the vehicle,
The seat back is
The first member formed in a plate shape and
The second member having a hat cross-sectional shape in which the flange portion contacts one side in the thickness direction of the first member, and the second member.
It has a central bead provided in the central portion of the first member, and has.
In a plan view along the thickness direction of the first member, the second member and the longitudinal end of the central bead overlap each other.
The first member has a central bead formed so as to rise toward the second member.
The second member is a vehicle seat in which a tunnel portion is provided in a part of a flange portion and a vertical wall portion of the second member corresponding to the central bead . The vehicle seat according to claim 1 .
A vehicle seat in which the flat surface portion of the first member and the flange portion of the second member are mutually fixed. The vehicle seat according to claim 1 or 2 .
A first connecting portion for detachably connecting the upper part of the first member on the side of the body in the forward direction of the vehicle, and
A second connecting portion for rotatably connecting the lower part of the first member in the forward direction side of the vehicle in the body, and a second connecting portion.
It has a third connection portion adjacent to the second connection portion and for rotatably connecting the lower part of the first member.
The central bead is a vehicle seat along a line that intersects the line connecting the first connection portion and the third connection portion. The vehicle seat according to any one of claims 1 to 3 .
The second member is a vehicle seat having a plan view frame shape.

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