Cushion frame for vehicle seat

Abstract

To disclose one example of a cushion frame where deformation that a cushion side frame falls inward is induced when a heavy downward load operates on the cushion side frame.SOLUTION: An extension direction one end side of a second connection member 14 is joined to a fragile part 16 provided for a first cushion side frame 11. A fixed wall part 16A of the fragile part 16 to which the second connection member 14 is joined and fixed is positioned inside an upper joint wall part 16B and a lower fixed wall part 16C. Thus, when a heavy downward load operates on the first cushion side frame 11, a moment inducing deformation that it falls inward, or on the second cushion side frame 12 side operates on the first cushion side frame 11. Then, the second connection member 14 regulates deformation that the first cushion side frame 11 falls outward.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a cushion frame for use in a vehicle seat. [Background technology]

[0002] For example, a lower arm of a cushion frame for a vehicle seat (hereinafter referred to as a cushion frame) described in Patent Document 1 is provided with a weak part that induces deformation of the lower arm. The lower arm is an example of a cushion side frame that constitutes a part of the cushion frame.

[0003] In this cushion frame, when a large rearward load acts on the back frame, the lower arm deforms starting from the weak portion, thereby preventing the back frame from falling excessively rearward. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-30583 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a large downward load is applied to the cushion side frame, if the cushion side frame is deformed so as to collapse outward, it may become difficult to adequately absorb the load.

[0006] The term "outside" refers to the side opposite the center of the cushion frame in the seat width direction, with the cushion side frame in between, and the term "inside" refers to the side on the same side as the center of the cushion frame in the seat width direction.

[0007] In view of the above, the present disclosure provides a cushion side frame that is induced to deform inwardly when a large downward load acts on the cushion side frame. profit An example of a cushion frame is disclosed. [Means for solving the problem]

[0008] It is desirable for a cushion frame used in a vehicle seat to have at least one of the following configuration requirements, for example. That is, the constituent features include a first cushion side frame (11) extending in the front-rear direction of the seat, a second cushion side frame (12) disposed at a position shifted in the seat width direction with respect to the first cushion side frame (11), the second cushion side frame (12) extending in the front-rear direction of the seat, and a connecting member (14) extending in the seat width direction, the connecting member (14) connecting a rear side of the first cushion side frame (11) to a rear side of the second cushion side frame (12), one end side in the extension direction of the connecting member (14) is connected to a weak portion (16) provided in the first cushion side frame (11), the weak portion (16) is located above the fixed wall portion (16A) to which the connecting member (14) is connected and fixed, and the weak portion (16) is located above the fixed wall portion (16A) to which the back frame (7) is connected. the lower fixed wall portion (16C) is located below the fixed wall portion (16A) and is fixed directly or indirectly to the vehicle, the lower fixed wall portion (16C) being located on the opposite side of the second cushion side frame (12) with the fixed wall portion (16A) in the seat width direction, an upper connecting wall portion (16D) connecting the fixed wall portion (16A) and the upper connecting wall portion (16B), and a lower connecting wall portion (16E) connecting the fixed wall portion (16A) and the lower fixed wall portion (16C), and further, the lower fixed wall portion (16C) is provided with a wall-shaped flange portion (11A) protruding toward the second cushion side frame (12).

[0009] As a result, when a large downward load acts on the cushion side frame, a moment acts on the first cushion side frame (11) inducing deformation such that the first cushion side frame (11) falls toward the second cushion side frame (12), i.e., inward.

[0010] At this time, the connecting member (14) restricts the deformation of the first cushion side frame (11) such that the first cushion side frame (11) falls outward. Therefore, when a large downward load acts on the first cushion side frame (11), the first cushion side frame (11) may be induced to deform so as to fall inward.

[0011] In this regard, if the first cushion side frame (11) were to be deformed so as to fall outward, a large tensile stress would be likely to be generated in the flange portion (11A), which may cause the flange portion (11A) to break early.

[0012] The cushion frame may have the following configuration, for example. That is, it is desirable that the lower fixed wall portion (16C) is farther away from the fixed wall portion (16A) in the seat width direction than the upper connecting wall portion (16B) is, so that a moment that induces deformation such that the first cushion side frame (11) falls inward is surely applied to the first cushion side frame (11).

[0013] The other end side in the extension direction of the connecting member (14) is connected to a second weak portion (17) provided on the second cushion side frame (12). The second weak portion (17) is a second fixed wall portion (17A) to which the connecting member (14) is connected and fixed, a second upper connecting wall portion (17B) located above the second fixed wall portion (17A) and to which the back frame (8) is connected, and is located on the opposite side to the first cushion side frame (11) with respect to the second fixed wall portion (17A) in the seat width direction, and a second lower connecting wall portion (17B) located above the second fixed wall portion (17A) and connected to the vehicle. The fixed wall portion (17C) is configured to include a second lower fixed wall portion (17C) located on the opposite side of the first cushion side frame (11) in the seat width direction across the second fixed wall portion (17A), a second upper connecting wall portion (17D) connecting the second fixed wall portion (17A) and the second upper connecting wall portion (17B), and a second lower connecting wall portion (17E) connecting the second fixed wall portion (17A) and the second lower fixed wall portion (17C), and further, it is desirable that the second lower fixed wall portion (17C) is provided with a wall-shaped flange portion (12A) protruding toward the first cushion side frame (11).

[0014] As a result, when a large downward load acts on the cushion side frame, a moment acts on the second cushion side frame (12) inducing deformation such that the second cushion side frame (12) falls toward the first cushion side frame (11), i.e., inward.

[0015] It is desirable that the second lower fixed wall portion (17C) be spaced farther from the second fixed wall portion (17A) in the seat width direction than the second upper connecting wall portion (17B) is. As a result, a moment that induces deformation such that the second cushion side frame (12) falls inward is surely applied to the second cushion side frame (12).

[0016] Furthermore, the cushion frame used in the vehicle seat includes a first cushion side frame (11) extending in the front-rear direction of the seat, and a second cushion side frame (12) disposed at a position shifted in the seat width direction with respect to the first cushion side frame (11), the second cushion side frame (12) extending in the front-rear direction of the seat, and a connecting member (14) extending in the seat width direction, which connects a rear side of the first cushion side frame (11) and a rear side of the second cushion side frame (12). It is desirable that one end side in the extension direction of the connecting member (14) is connected to a first weak portion (16) provided in the first cushion side frame (11), and the first weak portion (16) is a portion including a recessed portion recessed toward the second cushion side frame (12), and the other end side in the extension direction of the connecting member (14) is connected to a second weak portion (17) provided in the second cushion side frame (12), and the second weak portion (17) is a portion including a recessed portion recessed toward the first cushion side frame (11).

[0017] As a result, a moment that induces deformation such that the first cushion side frame (11) and the second cushion side frame (12) fall inward is surely applied to them. Incidentally, the symbols in the above parentheses are examples showing the correspondence with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0018] [Figure 1] 1 is a diagram showing a vehicle seat according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a diagram showing a cushion frame according to the first embodiment. [Diagram 3] 5A to 5C are diagrams showing a connection structure between a second connecting member and a weak portion in the first embodiment. [Figure 4] 5A to 5C are diagrams showing a connection structure between a second connecting member and a weak portion in the first embodiment. [Diagram 5]6A and 6B are diagrams showing a connection structure between the first cushion side frame and the second cushion side frame and between the second connecting member and the second connecting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiment.

[0020] This embodiment is an example in which the cushion frame according to the present disclosure is applied to a seat (hereinafter, referred to as a vehicle seat) mounted on a vehicle such as a car. Arrows and diagonal lines indicating directions are provided in each figure to facilitate understanding of the relationships between the figures and the shapes of components or parts.

[0021] Therefore, the cushion frame is not limited to the directions shown in the drawings. The directions shown in the drawings are the directions when the vehicle seat according to the present embodiment is assembled to a vehicle. The drawings with diagonal lines do not show cross-sectional views.

[0022] At least one of each of the members or parts described with a reference symbol is provided, unless otherwise specified by "one". In other words, unless otherwise specified by "one", the member may be provided in two or more. The cushion frame disclosed in the present disclosure includes at least the components such as the members or parts described with a reference symbol.

[0023] (First embodiment) 1. Overview of vehicle seats 1, the vehicle seat 1 includes at least a seat cushion 3 and a seat back 5. The seat cushion 3 is a portion for supporting the buttocks of a seated occupant. The seat back 5 is a portion for supporting the back of the seated occupant.

[0024] The seat frame 6 constituting the framework of the vehicle seat 1 has a back frame 7, a cushion frame 9, etc. The back frame 7 constitutes the framework of the seat back 5. The cushion frame 9 constitutes the framework of the seat cushion 3.

[0025] The back frame 7 has at least a first back side frame 7A, a second back side frame 7B, a connecting frame 7C, etc. The first back side frame 7A and the second back side frame 7B are members that extend substantially in the vertical direction.

[0026] The second back side frame 7B is disposed at a position shifted in the seat width direction (to the right in this embodiment) with respect to the first back side frame 7A. The connecting frame 7C is a member extending in the seat width direction.

[0027] The connecting frame 7C connects the upper end side of the first back side frame 7A and the upper end side of the second back side frame 7B. The lower end sides of the first back side frame 7A and the second back side frame 7B are connected to the cushion frame 9.

[0028] 2. Details of the cushion frame As shown in FIG. 1, the cushion frame 9 includes at least a first cushion side frame 11, a second cushion side frame 12, a first connecting member 13, a second connecting member 14, and the like.

[0029] The first cushion side frame 11 and the second cushion side frame 12 are members extending in the front-rear direction of the seat. The second cushion side frame 12 is disposed at a position shifted from the first cushion side frame 11 in the seat width direction.

[0030] The first cushion side frame 11 and the second cushion side frame 12 are generally symmetrical in shape. The first back side frame 7A is connected to the rear end side of the first cushion side frame 11.

[0031] The second back side frame 7B is connected to the rear end side of the second cushion side frame 12. The first back side frame 7A is connected to the first cushion side frame 11 via a recliner 10A (see FIG. 3).

[0032] The second back side frame 7B is connected to the second cushion side frame 12 via the recliner 10B (see FIG. 4). The recliner 10A and the recliner 10B switch between a state in which the back frame 7 is rotatable relative to the cushion frame 9 and a state in which the back frame 7 is not rotatable.

[0033] The first connecting member 13 and the second connecting member 14 are members that extend in the seat width direction and connect the first cushion side frame 11 and the second cushion side frame 12. Note that the first connecting member 13 and the second connecting member 14 according to this embodiment are made of round steel pipes.

[0034] The first connecting member 13 connects the front side of the first cushion side frame 11 to the front side of the second cushion side frame 12. The second connecting member 14 connects the rear side of the first cushion side frame 11 to the rear side of the second cushion side frame 12.

[0035] In this embodiment, the front end of the first cushion side frame 11 and the front end of the second cushion side frame 12 are connected by a third connecting member 15. The third connecting member 15 is a member having a panel-shaped plate surface on the upper surface.

[0036] 2.1 Connection structure between the second connecting member and the first cushion side frame <Outline of the connection structure> One end side in the extension direction of the second connecting member 14 (the left end side in this embodiment) is connected to a weak portion 16 shown in Fig. 2. The weak portion 16 is provided on the first cushion side frame 11. The weak portion 16 is a portion that includes a recess that is recessed toward the second cushion side frame 12 side.

[0037] <Details of the connection structure> As shown in FIG. 3, the fragile portion 16 is configured to have at least a fixed wall portion 16A, an upper connecting wall portion 16B, a lower fixed wall portion 16C, an upper connecting wall portion 16D, and a lower connecting wall portion 16E.

[0038] The fixed wall portion 16A is a portion to which the second connecting member 14 is connected and fixed. The second connecting member 14 is fixed to the fixed wall portion 16A by welding in a state in which the second connecting member 14 passes through a through hole provided in the fixed wall portion 16A.

[0039] The upper connecting wall portion 16B is located above the fixed wall portion 16A and is a portion to which the first back side frame 7A is connected. The upper connecting wall portion 16B is located on the opposite side to the second cushion side frame 12 across the fixed wall portion 16A in the seat width direction, that is, on the outer side of the fixed wall portion 16A.

[0040] The lower fixed wall portion 16C is located below the fixed wall portion 16A and is directly or indirectly fixed to the vehicle. The lower fixed wall portion 16C is located on the opposite side of the second cushion side frame 12 across the fixed wall portion 16A in the seat width direction, that is, on the outer side of the fixed wall portion 16A.

[0041] The lower fixed wall portion 16C is farther away from the fixed wall portion 16A in the seat width direction than the upper connecting wall portion 16B. In other words, the lower fixed wall portion 16C is positioned outwardly of the upper connecting wall portion 16B with respect to the fixed wall portion 16A.

[0042] The lower fixed wall portion 16C according to this embodiment is fixed to a floor panel of the vehicle via a slide device (not shown). The slide device is a support device that supports the vehicle seat 1 so that the vehicle seat 1 can slide.

[0043] The upper connecting wall 16D connects the fixed wall 16A and the upper connecting wall 16B. The lower connecting wall 16E connects the fixed wall 16A and the lower fixed wall 16C. Furthermore, the lower fixed wall 16C is provided with a wall-shaped flange 11A (see FIG. 5) that protrudes toward the second cushion side frame 12, i.e., inward.

[0044] The flange portion 11A according to this embodiment is a wall-like portion that protrudes inward over substantially the entire rear end portion of the first cushion side frame 11 (see FIG. 2). The fragile portion 16 and the flange portion 11A, i.e., the first cushion side frame 11, are integrally formed by pressing a single metal plate.

[0045] 2.2 Connection structure between the second connecting member and the second cushion side frame <Outline of the connection structure> The other end side in the extension direction of the second connecting member 14 (the right end side in this embodiment) is connected to a weak portion 17 shown in Fig. 2. The weak portion 17 is provided on the second cushion side frame 12. The weak portion 17 is a portion that includes a recess that is recessed toward the first cushion side frame 11 side.

[0046] <Details of the connection structure> As shown in FIG. 4, the fragile portion 17 is configured to at least have a fixed wall portion 17A, an upper connecting wall portion 17B, a lower fixed wall portion 17C, an upper connecting wall portion 17D, and a lower connecting wall portion 17E.

[0047] The fixed wall portion 17A is a portion to which the second connecting member 14 is connected and fixed. The second connecting member 14 is welded and fixed to the fixed wall portion 17A in a state in which the second connecting member 14 passes through a through hole provided in the fixed wall portion 17A.

[0048] The upper connecting wall portion 17B is located above the fixed wall portion 17A and is a portion to which the second back side frame 7B is connected. The upper connecting wall portion 17B is located on the opposite side to the first cushion side frame 11 across the fixed wall portion 17A in the seat width direction, that is, on the outer side of the fixed wall portion 17A.

[0049] The lower fixed wall portion 17C is located below the fixed wall portion 17A and is directly or indirectly fixed to the vehicle. The lower fixed wall portion 17C is located on the opposite side of the first cushion side frame 11 across the fixed wall portion 17A in the seat width direction, that is, on the outer side of the fixed wall portion 17A.

[0050] The lower fixed wall portion 17C is farther away from the fixed wall portion 17A in the seat width direction than the upper connecting wall portion 17B is. In other words, the lower fixed wall portion 17C is positioned more outward with respect to the fixed wall portion 17A than the upper connecting wall portion 17B.

[0051] The lower fixed wall portion 17C according to this embodiment is fixed to a floor panel of the vehicle via a slide device (not shown). The slide device is a support device that supports the vehicle seat 1 so that the vehicle seat 1 can slide.

[0052] The upper connecting wall 17D connects the fixed wall 17A and the upper connecting wall 17B. The lower connecting wall 17E connects the fixed wall 17A and the lower fixed wall 17C. Furthermore, the lower fixed wall 17C is provided with a wall-shaped flange 12A (see FIG. 5) that protrudes toward the first cushion side frame 11, i.e., inward.

[0053] The flange portion 12A according to this embodiment is a wall-like portion that protrudes inward over substantially the entire rear end portion of the second cushion side frame 12 (see FIG. 2). The fragile portion 17 and the flange portion 12A, i.e., the second cushion side frame 12, are integrally formed by pressing a single metal plate.

[0054] 3. Features of the Vehicle Seat (Especially the Cushion Frame) According to the Present Invention One end side in the extension direction of the second connecting member 14 is connected to a weak portion 16 provided on the first cushion side frame 11. Of the weak portion 16, a fixed wall portion 16A to which the second connecting member 14 is connected and fixed is located inside the upper connecting wall portion 16B and the lower fixed wall portion 16C.

[0055] As a result, when a large downward load acts on the first cushion side frame 11, a moment acts on the first cushion side frame 11, inducing deformation such that the first cushion side frame 11 falls toward the second cushion side frame 12, that is, inward.

[0056] At this time, the second connecting member 14 restricts the deformation of the first cushion side frame 11 such that the first cushion side frame 11 falls outward. Therefore, when a large downward load acts on the first cushion side frame 11, the deformation of the first cushion side frame 11 such that the first cushion side frame 11 falls inward may be induced.

[0057] The lower fixed wall portion 16C is farther away from the fixed wall portion 16A in the seat width direction than the upper connecting wall portion 16B. In other words, the lower fixed wall portion 16C is located outside the upper connecting wall portion 16B. This ensures that a moment that induces deformation such as inwardly collapsing acts on the first cushion side frame 11.

[0058] The other end side in the extension direction of the second connecting member 14 is connected to a weak portion 17 provided on the second cushion side frame 12. Of the weak portion 17, a fixed wall portion 17A to which the second connecting member 14 is connected and fixed is located inside the upper connecting wall portion 17B and the lower fixed wall portion 17C.

[0059] As a result, when a large downward load acts on the second cushion side frame 12, a moment acts on the second cushion side frame 12, inducing deformation such that the second cushion side frame 12 falls toward the first cushion side frame 11, that is, inward.

[0060] The lower fixed wall portion 17C is farther away from the fixed wall portion 17A in the seat width direction than the upper connecting wall portion 17B. In other words, the lower fixed wall portion 17C is located outside the upper connecting wall portion 17B. This ensures that a moment that induces deformation such as inwardly tilting acts on the second cushion side frame 12.

[0061] (Other embodiments) In the above embodiment, the left end side and the right end side of the second connecting member 14 are connected to the weak portions 16, 17, respectively. However, the present disclosure is not limited to this. For example, the present disclosure may be configured such that either one of the left end side and the right end side of the second connecting member 14 is connected to a weak portion. In other words, the cushion frame 9 may be configured such that only one of the left end side and the right end side is provided with a weak portion.

[0062] In the above-described embodiment, the lower fixed wall portions 16C and 17C are configured to be located outside the upper connecting wall portions 16B and 17B. However, the present disclosure is not limited to this. That is, the present disclosure may be configured as follows, for example: (1) or (2).

[0063] (1) A configuration in which the lower fixed wall portions 16C, 17C are located inside the upper connecting wall portions 16B, 17B. (2) A configuration in which the lower fixed wall portions 16C, 17C and the upper connecting wall portions 16B, 17B are located at the same position in the seat width direction.

[0064] The fragile portions 16, 17 according to the above-described embodiment are portions including recesses recessed inward. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the upper connecting wall portions 16B, 17B and the fixed wall portions 16A, 17A are at the same position in the seat width direction.

[0065] The lower connecting wall portions 16E, 17E according to the above-described embodiment are partially curved in a wavy shape (see FIGS. 3 and 4). However, the present disclosure is not limited to this. That is, the present disclosure may be such that the lower connecting wall portions 16E, 17E are simply formed of inclined surfaces similar to the upper connecting wall portions 16D, 17D.

[0066] The upper connecting wall portions 16D, 17D according to the above-described embodiment are simply configured as inclined surfaces (see FIGS. 3 and 4). However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the upper connecting wall portions 16D, 17D are partially curved in a wavy shape, similar to the lower connecting wall portions 16E, 17E.

[0067] The second connecting member 14 according to the embodiment described above is welded to each of the first cushion side frame 11 and the second cushion side frame 12 while penetrating through each of the first cushion side frame 11 and the second cushion side frame 12.

[0068] However, the present disclosure is not limited thereto. That is, the present disclosure may be configured as follows: (1) or (2). (1) A configuration in which the second connecting member 14 is fixed to each of the first cushion side frame 11 and the second cushion side frame 12 with bolts. (2) A configuration in which the second connecting member 14 is fixed to each of the first cushion side frame 11 and the second cushion side frame 12 by crimping.

[0069] The second connecting member 14 according to the above embodiment is made of a pipe material. However, the present disclosure is not limited to this. That is, in the present disclosure, for example, the second connecting member 14 may be made of a panel material.

[0070] In the above embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited to this, and the invention can also be applied to seats used in vehicles such as railway cars, ships, and aircraft, as well as stationary seats used in theaters, homes, and the like.

[0071] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0072] 1... Vehicle seat 3... Seat cushion 5... Seat back 6... Seat frame 7... Back frame 7A... 1st back side frame 7B: Second backside frame 7C: Connecting frame 9… Cushion frame 10A, 10B… Reclina 11... First cushion side frame 11A... Flange section 12... Second cushion side frame 12A... Flange section 13... First connecting member 14... Second connecting member 15... Third connecting member 16... Weak part 16A... Fixed wall part 16B... Upper connecting wall part 16C... Lower fixed wall section 16D... Upper connecting wall section 16E... Lower connecting wall section 17... Weak part 17A... Fixed wall part 17B... Upper connecting wall part 17C... Lower fixed wall section 17D... Upper connecting wall section 17E... Lower connecting wall section

Claims

1. In a cushion frame used in a vehicle seat, A first cushion side frame extending in a seat front-rear direction, the first cushion side frame being provided with a weak portion and a flange portion; a second cushion side frame disposed at a position shifted in a seat width direction with respect to the first cushion side frame and extending in a seat front-rear direction; a connecting member extending in a seat width direction, the connecting member connecting a rear side of the first cushion side frame and a rear side of the second cushion side frame, and having one end in an extension direction connected to the weak portion, The fragile portion is a fixed wall portion to which the connecting member is connected and fixed; an upper connecting wall portion located above the fixed wall portion and to which a back frame is connected, the upper connecting wall portion being located on the opposite side of the second cushion side frame with the fixed wall portion in between in the seat width direction; a lower fixed wall portion located below the fixed wall portion, directly or indirectly fixed to a vehicle, the lower fixed wall portion being located on the opposite side of the second cushion side frame with the fixed wall portion interposed therebetween in the seat width direction; An upper connecting wall portion connecting the fixed wall portion and the upper connecting wall portion, and The lower connecting wall portion connects the fixed wall portion and the lower fixed wall portion, the lower fixed wall portion is spaced apart from the fixed wall portion in the seat width direction by a greater distance than the upper connecting wall portion; Furthermore, the flange portion provided on the first cushion side frame is a portion provided on the lower fixed wall portion and is a wall-shaped portion protruding toward the second cushion side frame.

2. The other end side of the connecting member in the extension direction is connected to a second weak portion provided on the second cushion side frame, The second weak portion is a second fixed wall portion to which the connecting member is connected and fixed; a second upper connecting wall portion located above the second fixed wall portion, to which a back frame is connected, the second upper connecting wall portion being located on the opposite side to the first cushion side frame across the second fixed wall portion in the seat width direction; a second lower fixed wall portion located below the second fixed wall portion and connected to a vehicle, the second lower fixed wall portion being located on an opposite side to the first cushion side frame across the second fixed wall portion in the seat width direction; a second upper connecting wall portion connecting the second fixed wall portion and the second upper connecting wall portion; and The second lower connecting wall portion connects the second fixed wall portion and the second lower fixed wall portion, 2. The cushion frame for a vehicle seat according to claim 1, further comprising a wall-shaped flange portion protruding toward the first cushion side frame on the second lower fixed wall portion.

3. 3. The cushion frame for a vehicle seat according to claim 2, wherein the second lower fixed wall portion is spaced farther from the second fixed wall portion in the seat width direction than the second upper connecting wall portion is.

4. 4. The cushion frame for a vehicle seat according to claim 1, wherein the lower fixed wall portion is a wall portion that is substantially parallel to the vertical direction and parallel to the fixed wall portion.

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