Vehicle seats

Abstract

To provide a vehicle seat that enbles appropriately arranging a recess serving as a reinforcing part, relative to a seat frame including side frames with plate thicknesses different from one another.SOLUTION: A vehicle seat includes a seat frame. The seat frame includes a pair of side frames 10 that are disposed on side parts of the vehicle seat. The pair of side frames each has: a thick part 11 with a first plate thickness t1; an intermediate thick part 12 with a second plate thickness t2, thinner than the thick part 11, which is formed so as to continue from the thick part 11; and a thin part 13 with a third thickness t3, thinner than the intermediate thick part 12, which is formed so as to continue from the intermediate thick part 12. A side part of each of the side frames 10 has a recess continuous in an extending direction of the side frame 10. The recess is provided over the thick part 11, the intermediate thick part 12 and the thin part 13.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat having recesses formed in side frames. [Background technology]

[0002] 2. Description of the Related Art In vehicle seats, because the strength required for side frames of a seat back frame differs in different parts, a technique for thickening a part of the side frame is known (Patent Document 1).

[0003] More specifically, in the technology of Patent Document 1, the side frame of the seatback frame is composed of a side frame main body and a side frame that is formed thicker than the side frame main body and welded to the lower part of the side frame main body, thereby ensuring the strength of the hinge connection part where the lower part of the side frame of the seatback frame is connected to the seat cushion frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5691769 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to minimize the increase in weight of the side frame while ensuring the necessary strength, it is desirable to vary the thickness of the side frame more finely; however, if a recess is formed in the side frame as a reinforcing part, it is necessary to position the recess appropriately.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a vehicle seat in which a recess as a reinforcing part can be appropriately positioned in a seat frame having side frames with different plate thicknesses. [Means for solving the problem]

[0007] The above problem is solved by a vehicle seat according to the present invention, which is a vehicle seat including a seat frame, the seat frame including a pair of side frames disposed on sides of the vehicle seat, the side frames including a thick portion having a first plate thickness, a middle portion having a second plate thickness formed continuously with the thick portion and thinner than the thick portion, and a thin portion having a third plate thickness formed continuously with the middle portion and thinner than the middle portion, the side portions of the side frames being provided with recesses extending in an extension direction of the side frames, the recesses being provided across the thick portion, the middle portion, and the thin portion. The recess has a narrow portion and a wide portion that is wider than the narrow portion, the thick portion and the medium portion are continuous at a first boundary, and the widest portion of the recess is provided across the first boundary. This is solved by:

[0008] In the vehicle seat of the present invention configured as described above, it becomes possible to arrange the recesses as reinforcing portions in a well-balanced manner with respect to the side frames having different plate thicknesses. In addition, it is possible to appropriately arrange the recesses as reinforcing parts in a well-balanced manner for the side frames having different plate thicknesses. Also, since the wide parts of the recesses for increasing the strength of the side frames span the boundary parts, it is possible to appropriately increase the strength at the boundary parts of the plate thicknesses.

[0009] In the above vehicle seat, The recess has the wide portion of a first width, the narrow portion of a second width narrower than the wide portion, and a middle portion of a third width narrower than the wide portion and wider than the narrow portion, the middle portion and the thin portion are continuous at a second boundary, and the widest portion of the middle portion is provided across the second boundary. It is good. In the above configuration, It is possible to effectively arrange the recesses as reinforcing parts in a well-balanced manner for the side frames having different plate thicknesses. In addition, since the center of the width of the recesses for increasing the strength of the side frames spans the boundary part, it is possible to appropriately increase the strength at the boundary part where the plate thicknesses differ.

[0010] In the above vehicle seat, The seat frame is a seat back frame, and the narrow width portion is provided at a maximum width portion of the side frame in the front-rear direction. It is good. In the above configuration, It is possible to arrange the recesses as reinforcing parts in a well-balanced manner with respect to the side frames having different plate thicknesses of the seat back frame.

[0011] In the above vehicle seat, The rear end of the wide portion, the rear end of the central width portion, and the rear end of the narrow portion are flush with each other. Good 。

[0012] In the above vehicle seat, The front end of the narrow portion is disposed rearward of the front end of the wide portion and forward of the front end of the central portion. Good 。

[0013] In the above vehicle seat, A bridging member is provided between the pair of side frames, and a fixing portion of the bridging member to the side frame is provided rearward of a front end of the widest portion of the recess and forward of a rear end of the widest portion of the recess. Good 。

[0014] In the vehicle seat described above, a first bridging member, a second bridging member, and a third bridging member are provided between the pair of side frames, and a first fixing portion of the first bridging member to the side frame is fixed to the thick portion. The wide portion The second bridging member is fixed to the side frame by a second fastening portion. The narrow portion The third bridging member is fixed to the side frame by the thin-walled portion. The middle part of the width It is preferable that the above-mentioned structure is formed as follows. With the above-described configuration, it is possible to apply a load in a balanced manner to side frames having different plate thicknesses.

[0015] In the vehicle seat described above, the first fixing portion, the second fixing portion, and the third fixing portion are each provided with the recess. The center in the front-to-rear direction It is advisable that such measures be taken. In the above configuration, by arranging the fixing portion in the recess for increasing the strength of the side frame, it becomes possible to apply an appropriate load to the side frame.

[0017] The vehicle seat may further include a padding member placed on the seat frame, and a cover material covering the padding member. With the above configuration, in a vehicle seat having side frames with different plate thicknesses, it is possible to arrange the recesses as reinforcing portions in a well-balanced manner with respect to the side frames. Effect of the Invention

[0018] According to the vehicle seat of the present invention, it is possible to arrange the recesses as reinforcing portions in a well-balanced manner among the side frames having different plate thicknesses. Furthermore, according to the vehicle seat of the present invention, it is possible to appropriately arrange the recesses as reinforcing parts in a well-balanced manner with respect to the side frames having different plate thicknesses. 。 MaFurthermore, according to the vehicle seat of the present invention, the wide portion of the recess for increasing the strength of the side frame spans the boundary portion, making it possible to appropriately increase the strength at the boundary portion where the plate thicknesses differ. Furthermore, according to the vehicle seat of the present invention, it is possible to effectively arrange the recesses as reinforcing portions in a well-balanced manner with respect to the side frames having different plate thicknesses. Furthermore, according to the vehicle seat of the present invention, the narrow width portion of the recess for increasing the strength of the side frame spans the boundary portion, making it possible to appropriately increase the strength at the boundary portion where the plate thicknesses differ. Furthermore, according to the vehicle seat of the present invention, it is possible to apply a load in a well-balanced manner to the side frames having different plate thicknesses. Furthermore, according to the vehicle seat of the present invention, by arranging the fixing portion in the recess for increasing the strength of the side frame, it becomes possible to apply an appropriate load to the side frame. Furthermore, according to the vehicle seat of the present invention, it is possible to arrange the recesses as reinforcing parts in a well-balanced manner with respect to the side frames having different plate thicknesses that are provided in the seatback frame. Furthermore, according to the vehicle seat of the present invention, in a vehicle seat having side frames with different plate thicknesses, it is possible to arrange the recesses as reinforcing portions in a well-balanced manner relative to the side frames. [Brief description of the drawings]

[0019] [Figure 1] 1 is an external view of a vehicle seat according to an embodiment of the present invention; [Diagram 2] 2 is a perspective view of a seat frame included in the vehicle seat; FIG. [Diagram 3] FIG. [Figure 4] 4 is a cross-sectional view taken along line AA in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A vehicle seat according to one embodiment of the present invention (hereinafter, the present embodiment) will be described below with reference to Fig. 1 to Fig. 4. As the vehicle seat according to the present embodiment, a vehicle seat mounted in a vehicle will be described as an example.

[0021] The embodiment described below is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, and other aspects of the components described below may be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

[0022] In this specification, the terms indicating directions are defined as shown in FIG. 1. Specifically, in the following description, the "front-rear direction" means the front-rear direction as seen by a person sitting in the vehicle seat, and is the direction that coincides with the vehicle's traveling direction. The "seat width direction" means the width direction of the vehicle seat, and coincides with the left-right direction as seen by a person sitting in the vehicle seat. Additionally, the "up-down direction" means the height direction of the vehicle seat, and coincides with the up-down direction as seen by the vehicle seat from the front.

[0023] [1. Configuration of the vehicle seat S] The vehicle seat S according to this embodiment has an appearance as shown in FIG. 1. In FIG. 1, a part of the vehicle seat S is shown with a trim cover removed for convenience of illustration. The vehicle seat S has as its main components a seat back S1 which is a backrest portion supporting the back of a seated occupant, a seat cushion S2 which is a seating portion supporting the buttocks of the seated occupant, and a headrest S3 which is disposed on the upper part of the seat back S1 and supports the head of the seated occupant. As shown in FIG. 2, the vehicle seat S has a seat frame F as a skeleton, the main components of which are a seat back frame F1 and a seat cushion frame F2.

[0024] The seat back S1 is constructed by placing a seat back pad S11 on a seat back frame F1, and further covering the seat back pad S11 with a trim cover S12. The seat cushion S2 is constructed by placing a seat cushion pad S21 on a seat cushion frame F2, which serves as a framework, and further covering the seat cushion pad S21 with a trim cover S22. The head rest S3 is formed by disposing a head rest pad S31 on a core material (not shown), and covering it with a trim cover S32. The seat back pad S11 of the seat back S1 and the seat cushion pad S21 of the seat cushion S2 are urethane base materials molded by foam molding using a urethane foam material.

[0025] The seat cushion frame F2 is connected to an upper rail RU of a slide rail device R disposed below the seat cushion frame F2. With this configuration, when the upper rail RU moves along the lower rail RL fixed to the vehicle floor, the entire vehicle seat S including the seat cushion frame F2 slides.

[0026] [2. Structure of seat frame F] (Seat back frame F1) As shown in FIG. 2, the seatback frame F1 has a pair of seatback side frames 10 extending in the vertical direction and aligned at a distance from each other in the seat width direction, an upper frame 15 attached to the top of the pair of seatback side frames 10 to connect the pair of seatback side frames 10, and a lower frame 16 attached to the lower ends of the pair of seatback side frames 10 to connect the pair of seatback side frames 10.

[0027] The seatback side frame 10 integrally comprises a side plate 10a, a front flange 10b protruding inward from a front edge of the side plate 10a, and a rear flange 10c protruding inward from a rear edge of the side plate 10a. The seatback side frame 10 has a generally U-shaped cross section that opens inward, and is formed by press molding of a metal plate.

[0028] The upper frame 15 is formed into a downward U-shape when viewed from the front, and is made of a hollow metal pipe member. Both free ends (lower ends) of the upper frame 15 are joined to the upper parts of the pair of seatback side frames 10. A square cylindrical pillar guide 15a that supports a headrest pillar is attached to the front surface of the horizontal portion located above the upper frame 15.

[0029] A first wire member W1, a second wire member W2, and a third wire member W3 (bridging member), which are S-springs that support the back of an occupant from behind, are arranged side by side between a pair of seatback side frames 10. The first wire member W1, the second wire member W2, and the third wire member W3 are curved in a zigzag shape so that the metal wires meander up and down. The first wire member W1, the second wire member W2, and the third wire member W3 are arranged between the pair of seatback side frames 10 in this order from below.

[0030] As shown in Fig. 4, which is a cross-sectional view taken along line AA in Fig. 3, the seatback side frame 10 is formed in a shape in which the plate thickness changes at plate thickness boundaries (plate thickness boundary lines) arranged at a plurality of locations in the longitudinal direction (approximately the vertical direction). In this embodiment, a first boundary line L1 (first plate thickness boundary line) and a second boundary line L2 (second plate thickness boundary line) are set in the seatback side frame 10. The first boundary line L1 is arranged toward the lower portion of the seatback side frame 10. The second boundary line L2 is arranged above the first boundary line L1 and at a central position in the longitudinal direction of the seatback side frame 10.

[0031] The seat back side frame 10 has a thick portion 11 (first portion) that is a portion with a plate thickness t1 below the first boundary portion L1, a medium-thickness portion 12 (second portion) that is a portion with a plate thickness t2 above the first boundary portion L1 and below the second boundary portion L2, and a thin portion 13 (third portion) that is a portion with a plate thickness t3 above the second boundary portion L2 (t3 <t2<t1)。

[0032] The plate thickness t2 of the intermediate portion 12 between the first boundary portion L1 and the second boundary portion L2 is smaller than the plate thickness t1 of the thick portion 11 below the first boundary portion L1, and further the plate thickness t3 of the thin portion 13 above the second boundary portion L2 is smaller than the plate thickness t2 of the intermediate portion 12. In other words, the seatback side frame 10 is formed so that the thickness gradually decreases upward.

[0033] (Seat cushion frame F2) 2, the seat cushion frame F2 has a pair of seat cushion side frames 20 extending in the front-rear direction so as to be aligned at positions spaced apart from each other in the seat width direction, a pan frame 21 connecting front ends of the pair of seat cushion side frames 20, and a rear pipe 22 connecting rear ends of the pair of seat cushion side frames 20, which are integrally joined by welding or the like to form a frame. The seat cushion side frames 20 and the pan frame 21 are formed by pressing a metal plate, and the rear pipe 22 is formed from a metal pipe.

[0034] Between the pan frame 21 and the rear pipe 22, a seat spring 23 is stretched as a pressure-receiving member that elastically deforms when it receives the load of a seated occupant via a seat cushion pad S21. The seat cushion frame F2 has a plurality of seat springs 23 (three in this embodiment) that are formed by bending a metal wire in a zigzag pattern so as to snake left and right. The front ends of the plurality of seat springs 23 are engaged with locking portions 21a provided on the pan frame 21. The rear ends of the seat springs 23 are engaged with the rear pipe 22 and are connected by a resin rear end connecting member 24 that is molded integrally with the seat springs 23 by insert molding, and the rear end connecting member 24 is formed so as to cover the rear pipe 22.

[0035] [3. Features of the seat frame F] 3, the side plate portion 10a of the seatback side frame 10 is provided with a first recess 14a, a second recess 14b, and a third recess 14c as recesses 14, which are reinforcing portions recessed toward either the inside or the outside in the seat width direction. The first recess 14a, the second recess 14b, and the third recess 14c are provided continuously and extend in the longitudinal direction of the seatback side frame 10. In this embodiment, the first recess 14a, the second recess 14b, and the third recess 14c are formed so as to protrude inward when the seatback side frame 10 is press-processed.

[0036] The first recess 14a (wide portion) is provided in the side plate portion 10a across the first boundary portion L1. In other words, the first recess 14a is provided in the thick portion 11 and the medium thickness portion 12 of the seatback side frame 10 across the first boundary portion L1.

[0037] The second recess 14b (narrow width portion) is provided at a position avoiding the first boundary portion L1 and the second boundary portion L2. In other words, the second recess 14b is provided in the intermediate portion 12 of the seatback side frame 10 so as to be disposed between the first boundary portion L1 and the second boundary portion L2 in the up-down direction.

[0038] The third recess 14c (widthwise center portion) is provided in the side plate portion 10a across the second boundary portion L2. In other words, the third recess 14c is provided in the intermediate thickness portion 12 and the thin thickness portion 13 of the seatback side frame 10 across the second boundary portion L2.

[0039] On the inside of the side plate portion 10a of the seatback side frame 10, fixing portions (first fixing portion K1, second fixing portion K2 and third fixing portion K3) are formed for attaching the ends of the first wire member W1 (first bridging member), the second wire member W2 (second bridging member) and the third wire member W3 (third bridging member).

[0040] A first fixing portion K1, which is a hook portion for attaching the first wire member W1 (first bridging member) to the side plate portion 10a, is provided in the first recess 14a (wide portion) below the first boundary portion L1 in the thick portion 11, i.e., at a position avoiding the first boundary portion L1.

[0041] In addition, a second fixing portion K2, which is a hook portion for attaching the second wire member W2 (second bridging member) to the side plate portion 10a, is provided in the second recess 14b (narrow width portion) in the intermediate portion 12 above the first boundary portion L1 and below the second boundary portion L2, i.e., at a position avoiding the first boundary portion L1 and the second boundary portion L2.

[0042] Furthermore, a third fixing portion K3, which is a hook portion for attaching the third wire member W3 (third bridging member) to the side plate portion 10a, is provided in the third recess 14c (middle width portion) above the second boundary portion L2 in the thin-walled portion 13, i.e., at a position avoiding the second boundary portion L2.

[0043] As shown in FIG. 3, the recess 14 has a first recess 14a (wide portion) having a first width H1, a second recess 14b (narrow portion) having a second width H2 that is narrower than the first recess 14a (wide portion), and a third recess 14c (middle width portion) having a third width H3 that is narrower than the first recess 14a (wide portion) and wider than the second recess 14b (narrow portion) (H2 <H3

[0044] The first recess 14a (wide width portion), the second recess 14b (narrow width portion), and the third recess 14c (middle width portion) are each provided so as to overlap at least one of the thick-walled portion 11, the intermediate-walled portion 12, and the thin-walled portion 13. More specifically, the first recess 14a (wide width portion) is provided so as to overlap the thick-walled portion 11 and the intermediate-walled portion 12, the second recess 14b (narrow width portion) is provided so as to overlap the intermediate-walled portion 12, and the third recess 14c (middle width portion) is provided so as to overlap the intermediate-walled portion 12 and the thin-walled portion 13.

[0045] ​In this manner, since the recesses 14 are provided across the thick portion 11, the medium portion 12, and the thin portion 13, in the vehicle seat S of this embodiment, it is possible to position the recesses 14 as reinforcing portions in a balanced manner with respect to the seatback side frames 10 having different plate thicknesses.

[0046] In addition, since the recess 14 has the second recess 14b (narrow portion) and the first recess 14a (wide portion) which is wider than the second recess 14b, it is possible to appropriately position the recess 14 as a reinforcing portion in a balanced manner with respect to the seatback side frames 10 (side frames) which have different plate thicknesses.

[0047] Moreover, the seatback side frame 10 has an upper end (one end) in the extending direction of the seatback side frame 10 and a lower end (the other end) opposite to the upper end, and the first recess 14a (wide portion) is disposed at the lower end in the extending direction of the seatback side frame 10. With this configuration, it becomes possible to more appropriately dispose the recess 14 as a reinforcing portion in a well-balanced manner for the seatback side frames 10 (side frames) having different plate thicknesses.

[0048] Furthermore, the thick portion 11 and the intermediate portion 12 are continuous at the first boundary portion L1, and the intermediate portion 12 and the thin portion 13 are continuous at the second boundary portion L2, but the first recess 14a (wide portion) is provided across the first boundary portion L1. In this configuration, the first recess 14a (wide portion) of the recess 14 for increasing the strength of the seatback side frame 10 is provided across the first boundary portion L1, making it possible to appropriately increase the strength at the boundary portion between the different plate thicknesses.

[0049] Moreover, the third recess 14c (width central portion) is provided across the second boundary portion L2. In this configuration, the third recess 14c (width central portion) of the recess 14 for increasing the strength of the seatback side frame 10 is provided across the second boundary portion L2, so that it is possible to appropriately increase the strength at the boundary portion between the different plate thicknesses.

[0050] Regarding the recesses 14, the first recesses 14a (wide portion), the second recesses 14b (narrow portion), and the third recesses 14c (middle width portion) are provided so as to overlap at least one of the thick portion 11, the intermediate portion 12, and the thin portion 13. In this configuration, it is possible to effectively arrange the recesses 14 as reinforcing portions in a well-balanced manner with respect to the seat back side frames 10 (side frames) having different plate thicknesses.

[0051] 3, a first fixing portion K1 of the first wire member W1 (first bridging member) to the seatback side frame 10 is formed in the thick portion 11. A second fixing portion K2 of the second wire member W2 (second bridging member) to the seatback side frame 10 is formed in the medium thickness portion 12. A third fixing portion K3 of the third wire member W3 (third bridging member) to the seatback side frame 10 is formed in the thin thickness portion 13. In the vehicle seat S according to this embodiment configured in this manner, it is possible to apply a load in a balanced manner to the seatback side frames 10 having different plate thicknesses.

[0052] The first fixing portion K1, the second fixing portion K2, and the third fixing portion K3 are hook portions provided on the inner surface of the seatback side frame 10. The first wire member W1 (first bridging member), the second wire member W2 (second bridging member), and the third wire member W3 (third bridging member) are attached to these hook portions. In this configuration, by attaching each wire member (bridging member) to each fixing portion, which is the hook portion, it becomes possible to apply a load in a balanced manner to the seatback side frame 10 having different plate thicknesses.

[0053] Moreover, the first fixing portion K1, the second fixing portion K2, and the third fixing portion K3 are provided in the recess 14. In this configuration, by arranging each fixing portion in the recess 14 for increasing the strength of the seatback side frame 10, it becomes possible to apply an appropriate load to the seatback side frame 10.

[0054] In addition, the thick portion 11 and the intermediate portion 12 are continuous at a first boundary portion L1, and the intermediate portion 12 and the thin portion 13 are continuous at a second boundary portion L2, but the first fixing portion K1 is provided so as to avoid the first boundary portion L1, the second fixing portion K2 is provided so as to avoid the first boundary portion L1 and the second boundary portion L2, and the third fixing portion K3 is provided so as to avoid the second boundary portion L2. In this configuration, since each fixing portion is provided so as to avoid the boundary portion (boundary line) between the portions with different plate thicknesses, it becomes possible to apply a load in a balanced manner to the seat back side frame 10 with different plate thicknesses.

[0055] The first wire member W1 (first bridging member), the second wire member W2 (second bridging member), and the third wire member W3 (third bridging member) are elastic members (S springs) extending in the seat width direction. In this configuration, the elastic members can apply a load in a balanced manner to the seatback side frames 10 having different plate thicknesses.

[0056] In addition, in the above embodiment, the seatback side frames 10 with different plate thicknesses have been described as an example, but the above technical idea can also be applied to the seat cushion side frames 20. In other words, it becomes possible to arrange the recesses 14 as reinforcing parts in a well-balanced manner for the side frames with different plate thicknesses provided on the seatback frame F1 and the seat cushion frame F2.

[0057] The vehicle seat S includes a seat back pad S11 (pad member) placed on the seat back frame F1, and a trim cover S12 (skin material) that covers the seat back pad S11. In this configuration, in the vehicle seat S including the seat back side frames 10 having different plate thicknesses, it becomes possible to arrange the recesses 14 as reinforcing parts in a well-balanced manner with respect to the seat back side frames 10.

[0058] <Modification> Although the configuration of the vehicle seat S according to this embodiment has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit and scope of the present invention, and of course, the present invention includes equivalents thereof.

[0059] In the above embodiment, each wire member (bridging member) is an S-spring installed between the seatback side frames 10, but each wire member is not limited to an S-spring. Each wire member (bridging member) may be an elastic member attached to a plate-shaped pressure-receiving member. In such a configuration, it becomes possible to apply a load in a balanced manner to side frames having different plate thicknesses by the elastic member attached to the plate-shaped pressure-receiving member.

[0060] In the above embodiment, the first fixing portion K1, the second fixing portion K2 and the third fixing portion K3 were hook portions provided on the inner surface of the seatback side frame 10, but each fixing portion may be a through hole penetrating the side plate portion 10a of the seatback side frame 10.

[0061] The vehicle seat according to the present embodiment has been described above by taking the vehicle seat mounted on a vehicle as an example. The vehicle seat according to the present embodiment is not limited to a vehicle seat mounted on a ground-traveling vehicle having wheels such as an automobile or a train, but may be a seat mounted on an aircraft or a ship that moves on a road other than the ground. [Explanation of symbols]

[0062] S Vehicle seats (vehicle seats) S1 Seat Back S2 Seat Cushion S3 Headrest Seat frame, front F1 seat back frame F2 seat cushion frame S11 Seat back pad (pad material) S12 Trim cover (skin material) S21 Seat cushion pad (pad material) S22 Trim cover (skin material) S31 Headrest pad (pad material) S32 Trim cover (skin material) R Slide rail device RU Upper Rail RL Lower rail 10 Seat back side frame (side frame) 10a Side plate part 10b Front flange 10c Rear flange 11 Thick wall part 12 Medium meat section 13 Thin section L1 1st boundary L2 2nd boundary 14 Recess 14a First recess (recess, wide portion) 14b Second recess (recess, narrow portion) 14c Third recess (recess, width center) 15 Upper Frame 15a Pillar Guide 16 Lower frame W1 First wire member (first bridging member) W2 Second wire member (second bridging member) W3 Third wire member (third bridging member) K1 1st fixed part K2 2nd fixed part K3 3rd fixed part 20 Seat cushion side frame 21 Pan Frame 21a Locking part 22 Rear pipe 23 Seat spring 24 Rear end connecting member

Claims

1. A vehicle seat having a seat frame, The seat frame includes a pair of side frames disposed on sides of the vehicle seat, the side frame has a thick portion having a first plate thickness, a middle portion having a second plate thickness formed continuously with the thick portion and thinner than the thick portion, and a thin portion having a third plate thickness formed continuously with the middle portion and thinner than the middle portion, A recess extending in an extension direction of the side frame is provided on a side portion of the side frame, The recess is provided across the thick portion, the medium portion, and the thin portion, The recess has a narrow portion and a wide portion that is wider than the narrow portion, the thick portion and the medium thickness portion are continuous at a first boundary portion, A vehicle seat, wherein the widest portion of the recess is provided across the first boundary portion.

2. The recess has a wide portion of a first width, a narrow portion of a second width narrower than the wide portion, and a middle portion of a third width narrower than the wide portion and wider than the narrow portion, the intermediate thickness portion and the thin thickness portion are continuous at a second boundary portion, 2. The vehicle seat according to claim 1, wherein the widest portion in the widthwise center section is provided across the second boundary section.

3. The seat frame is a seat back frame, 3. The vehicle seat according to claim 2, wherein the narrow width portion is provided at a maximum width portion of the side frame in the front-rear direction.

4. A vehicle seat as described in claim 3, characterized in that the rear end of the wide portion, the rear end of the middle portion, and the rear end of the narrow portion are flush.

5. A vehicle seat as described in claim 4, characterized in that the front end of the narrow portion is positioned rearward of the front end of the wide portion and forward of the front end of the middle portion.

6. A bridging member is provided between a pair of the side frames, The vehicle seat according to claim 5, characterized in that a fixing portion of the bridging member relative to the side frame is provided rearward of a front end of the widest portion of the recess and forward of a rear end of the widest portion of the recess.

7. A first bridging member, a second bridging member, and a third bridging member are provided between the pair of side frames, a first fixing portion of the first bridging member relative to the side frame is formed in the wide portion of the thick-walled portion, a second fixing portion of the second bridging member relative to the side frame is formed in the narrow width portion of the intermediate thickness portion, 6. The vehicle seat according to claim 5, wherein a third fixing portion of the third bridging member with respect to the side frame is formed at the widthwise center portion of the thin portion.

8. 8. The vehicle seat according to claim 7, wherein the first fixing portion, the second fixing portion, and the third fixing portion are provided at a center portion of the recess in the front-rear direction.

9. A pad member placed on the seat frame; 9. The vehicle seat according to claim 1, further comprising a cover material that covers the pad member.

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