Back frame

Abstract

To disclose an example of a back frame capable of reducing welding failure between a side frame and a lower frame.SOLUTION: In the back frame 1, the lower frame 9 and the first side frame 3 can be clamped using the first flat surface portion 91. That is, the portions C1 to C3 indicated by the two dot chain line in FIG. 2 are laser-welded in a clamped state. At the time of welding, the operator can clamp both one side and the other side of the welding mark W1. In this way, in the back frame 1, since welding can be performed in a state where the first side frame 3 and the lower frame 9 are clamped at the planar portion, it is possible to reduce welding defects between the side frame and the lower frame.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] For example, in the back frame described in Patent Document 1, a frame-like frame is formed by two side frames, an upper frame, a lower frame, etc. The frames are welded to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-167380 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure discloses an example of a back frame that can reduce welding defects between a side frame and a lower frame. [Means for solving the problem]

[0005] It is desirable that the back frame of the vehicle seat have at least one of the following constituent features, for example. That is, the constituent elements are a first side frame (3) extending in the vertical direction, a second side frame (5) disposed at a position offset in the seat width direction with respect to the first side frame (3), the second side frame (5) extending in the vertical direction, an upper frame (7) extending in the seat width direction and connecting the upper end side of the first side frame (3) with the upper end side of the second side frame (5), a lower frame (9) extending in the seat width direction and connecting the lower end side of the first side frame (3) with the lower end side of the second side frame (5), a first flange portion (93) provided at the upper end edge of the lower frame (9) and extending from the upper end edge in the seat front-rear direction, and a first flat portion (91) provided on one end side of the extension direction of the lower frame (9), the first flat portion (91) being provided at a position shifted toward the first side frame (3) from one end of the first flange portion (93) in the seat width direction; a second flange portion (31) provided on the rear end side of the first side frame (3) and extending toward the second side frame (5), the second flange portion (31) having a second flat portion (33) continuing with an opposing surface (32) opposing the first flat portion (91); and a third flat portion (92) provided on one end side of the extension direction of the lower frame (9), the third flat portion (92) including a part of the first flat portion (91) and opposing the second flat portion (33).

[0006] It is desirable that at least one of the second and third flat portions (33, 92) protrudes toward the other flat portion (33), and that a weld mark (W1) is present in the middle of one of the flat portions (92) in the seat width direction.

[0007] This allows the back frame to sandwich (hereinafter also referred to as "clamp") the lower frame (9) and the first side frame (3) together by utilizing the first flat portion (91).

[0008] In addition, since a weld mark (W1) is present in the middle of one of the flat surfaces (92) in the sheet width direction, a welding worker (including an automatic welding machine) can perform welding while clamping both one side and the other side of the weld mark (W1).

[0009] In this way, the welding worker can perform welding while clamping the first side frame (3) and the lower frame (9) at a flat portion, so that the back frame can reduce poor welding between the side frame and the lower frame.

[0010] It is desirable that the third flat portion 92 protrudes toward the second flat portion 33. In addition, the first flange portion 93 may be eliminated, or the joint portion between the second side frame 5 and the lower frame 9 may have the same structure as the joint portion between the first side frame 3 and the lower frame 9.

[0011] Incidentally, the symbols in each of the parentheses above 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 parentheses above. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a diagram showing a back frame according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing a joint according to the first embodiment. [Figure 3] FIG. 2 is a diagram showing a lower frame according to the first embodiment. [Figure 4] FIG. 2 is an exploded view of a joint according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following "embodiments of the invention" are examples of embodiments that fall 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 and structures shown in the following embodiments.

[0014] This embodiment is an example in which the back 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 added to each figure to make it easier to understand the relationship between the figures and the shapes of components or parts.

[0015] Therefore, the back frame is not limited to the direction indicated in each drawing. The direction indicated in each drawing is the direction when the vehicle seat according to the present embodiment is assembled to a vehicle. Drawings indicated with diagonal lines do not always represent cross-sectional views.

[0016] At least one of a member or portion described with a reference numeral is provided unless otherwise specified, such as "one." In other words, unless otherwise specified, two or more of the member may be provided. The back frame shown in the present disclosure includes at least one of the components, such as the member or portion, described with a reference numeral, and the structural portion shown in the drawings.

[0017] (First embodiment) <1.Back frame overview> 1, the back frame 1 is a substantially rectangular frame that constitutes the framework of the seat back 2. The seat back 2 is a portion that supports the back of a seated occupant.

[0018] The back frame 1 includes at least a first side frame 3, a second side frame 5, an upper frame 7, and a lower frame 9. The first side frame 3 and the second side frame 5 are strength members that extend substantially in the vertical direction.

[0019] The second side frame 5 is spaced apart from the first side frame 3 in the seat width direction (in FIG. 1, The upper frame 7 is a strength member that extends in the seat width direction and connects the upper end sides of the first side frame 3 and the second side frame 5.

[0020] The lower frame 9 is a strength member that extends in the seat width direction and connects the lower end sides of the first side frame 3 and the second side frame 5. In this embodiment, the first side frame 3, the second side frame 5, the upper frame 7, and the lower frame 9 are made of metal, and these frames are joined by laser welding.

[0021] <2. Structure of the joint between the side frame and the lower frame> The configuration of the joint between the first side frame 3 and the lower frame 9 is the same as the configuration of the joint between the second side frame 5 and the lower frame 9. In other words, these two configurations are substantially symmetrical with respect to a virtual line that crosses the center of the lower frame 9 in the extension direction.

[0022] The following description relates to the configuration of the joint between the first side frame 3 and the lower frame 9 (particularly, part A in FIG. 2). 2, the first side frame 3 and the lower frame 9 are joined to each other at least at portions A and B. The thick solid line W1 shown in portion A and the thick solid line W2 shown in portion B indicate weld marks caused by laser welding.

[0023] As shown in Fig. 3, the lower frame 9 is provided with a first flat portion 91, a third flat portion 92, a first flange portion 93, etc. As shown in Fig. 4, the first side frame 3 is provided with a second flange portion 31.

[0024] 3, the first flange portion 93 is provided on the upper edge of the lower frame 9 and extends from the upper edge in the seat front-rear direction (toward the front in this embodiment). The first flat portion 91 is a flat portion provided on one end side of the lower frame 9 in the extension direction.

[0025] The first flat portion 91 is provided at a position shifted toward the first side frame 3 from one end of the first flange portion 93 in the seat width direction. Specifically, the first flat portion 91 is provided on the right end side of the lower frame 9, at a position shifted further rightward from the right end of the first flange portion 93.

[0026] 4, the second flange portion 31 is a flat portion provided at the rear end of the first side frame 3 and extending toward the second side frame 5. The second flange portion 31 has a second flat portion 33 that is continuous with an opposing surface 32 that faces the first flat portion 91.

[0027] The third flat portion 92 is a flat portion provided on one end (the right end in FIG. 4 ) in the extension direction of the lower frame 9. The third flat portion 92 (the area surrounded by the thick two-dot chain line in FIG. 3 ) includes the first flat portion 91 as a part thereof and faces the second flat portion 33.

[0028] At least one of the second flat surface portion 33 and the third flat surface portion 92 protrudes toward the other flat surface portion. Specifically, the third flat surface portion 92 protrudes toward the second flat surface portion 33.

[0029] The first flat portion 91, the third flat portion 92, the first flange portion 93, etc. are integrally formed with the lower frame 9 by subjecting a steel plate to plastic processing such as press working. Similarly, the opposing surface 32, the second flat portion 33, the second flange portion 31, etc. are integrally formed with the first side frame 3 by subjecting a steel plate to plastic processing such as press working.

[0030] 2, a thick solid line is formed at the middle portion of the third flat portion 92 in the seat width direction. There are weld marks indicated by W1. That is, a welding operator (including an automatic welding machine) irradiates a welding laser beam toward the middle part of the third flat portion 92 in the sheet width direction.

[0031] 3. Features of the back frame according to this embodiment In the back frame 1 according to this embodiment, the third flat portion 92 protrudes toward the second flat portion 33, and laser welding marks (thick solid lines W1) are present in the middle of the third flat portion 92 in the seat width direction.

[0032] This allows the back frame 1 to sandwich (hereinafter also referred to as "clamp") the lower frame 9 and the first side frame 3 together by utilizing the first flat portion 91.

[0033] Specifically, in this embodiment, laser welding is performed in a state where the areas C1 to C3 indicated by the two-dot chain lines in Fig. 2 are clamped. That is, during welding, the welding operator can clamp both one side and the other side of the weld mark W1.

[0034] In this way, the welding worker can perform welding while clamping the first side frame 3 and the lower frame 9 at a flat portion, so with the back frame 1, it may be possible to reduce poor welding between the side frame and the lower frame.

[0035] (Other embodiments) In the above-described embodiment, the third flat portion 92 protrudes toward the second flat portion 33. However, the present disclosure is not limited to this. That is, the present disclosure may be, for example, a configuration in which the third flat portion 92 and the second flat portion 33 protrude toward each other, or a configuration in which the second flat portion 33 protrudes toward the third flat portion 92.

[0036] In the above-described embodiment, the first side frame 3 and the lower frame 9 are joined by laser welding. However, the present disclosure is not limited to this. That is, the present disclosure may also be configured such that the first side frame 3 and the lower frame 9 are joined by an adhesive, for example.

[0037] In the above-described embodiment, the first flange portion 93 is provided on the lower frame 9. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the first flange portion 93 is eliminated.

[0038] In the above-described 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 thereto. That is, the present disclosure 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, etc.

[0039] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0040] 1... Back frame 2... Seat back 3... First side frame 5... Second side frame 7... Upper frame 9... Lower frame 31... Second flange 32... Opposite surface 33…Second plane part 91... 1st plane part 92...Third plane part 93... First flange

Claims

1. In a back frame of a vehicle seat, a first side frame extending in the vertical direction; a second side frame disposed at a position offset in a seat width direction relative to the first side frame and extending in a vertical direction; an upper frame extending in the seat width direction and connecting an upper end side of the first side frame and an upper end side of the second side frame; a lower frame extending in a seat width direction and connecting a lower end side of the first side frame and a lower end side of the second side frame; a first flange portion provided on an upper end edge of the lower frame and extending from the upper end edge in a seat front-rear direction; a first flat surface provided on one end side of the lower frame in an extension direction, the first flat surface provided at a position shifted toward the first side frame from one end of the first flange portion in a seat width direction; a second flange portion provided on a rear end side of the first side frame and extending toward the second side frame, the second flange portion having a second flat portion continuous with an opposing surface opposing the first flat portion; a third flat surface portion provided on one end side of the lower frame in the extension direction, the third flat surface portion including the first flat surface portion as a part thereof and facing the second flat surface portion; At least one of the second flat surface portion and the third flat surface portion protrudes toward the other flat surface portion, Furthermore, the back frame has weld marks at the middle portion in the seat width direction of one of the flat surfaces.

2. In a back frame of a vehicle seat, a first side frame extending in the vertical direction; a second side frame disposed at a position offset in a seat width direction relative to the first side frame and extending in a vertical direction; an upper frame extending in the seat width direction and connecting an upper end side of the first side frame and an upper end side of the second side frame; a lower frame extending in a seat width direction and connecting a lower end side of the first side frame and a lower end side of the second side frame; a first flat portion provided on one end side of the lower frame in an extension direction; a flange portion provided on a rear end side of the first side frame and extending toward the second side frame, the flange portion having a second flat portion continuous with an opposing surface opposing the first flat portion; a third flat surface portion provided on one end side of the lower frame in the extension direction, the third flat surface portion including the first flat surface portion as a part thereof and facing the second flat surface portion; At least one of the second flat surface portion and the third flat surface portion protrudes toward the other flat surface portion, Furthermore, the back frame has weld marks at the middle portion in the seat width direction of one of the flat surfaces.

3. The back frame according to claim 1 or 2, wherein the third flat portion protrudes toward the second flat portion.

Images