Seat frame and back frame

Abstract

To disclose an example of a back frame capable of preventing a terminal of the frame from coming into contact with other objects even when management of dimensional variation is relaxed.SOLUTION: A lap part 31 is provided outside a part of the first side frame 3 corresponding to the extending direction end part 71 of the upper frame 7, and the lap part 31 projected on the projected surface S overlaps with the extending direction end part 71 projected on the projected surface S and a part of the wall part 71A. The wall portion 71A is inclined so as to become lower toward the end portion 71 in the extending direction, and the wall-shaped portion 33 continuous from the end portion 32 of the overlapping portion 31 is inclined so as to be substantially parallel to the seat-width direction or so as to become lower toward the end portion 32 of the overlapping portion 31. Thus, in the back frame, even when the dimension of the gap between end 32 of first side frame 3 and end 71 of upper frame 7 varies, at least the terminal of upper frame 7 can be prevented from coming into contact with another object.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] For example, the back frame described in Patent Document 1 is configured by joining side frames and an upper frame to form a part of the back frame. The side frames are frames that extend in the vertical direction. The upper frame is a frame that extends in the seat width direction and has one end connected to the upper end of the side frame. [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] In the invention described in Patent Document 1, the terminals of the side frames and the terminals of the upper frames face each other with a predetermined gap between them. In order to prevent at least one of the terminals of the side frames and the terminals of the upper frames from coming into contact with other objects, the invention described in Patent Document 1 strictly controls the dimensional variations of each frame so that the size of the gap falls within an appropriate range.

[0005] In view of the above, the present disclosure discloses an example of a seat frame and a back frame that can prevent the ends of the frame from coming into contact with other objects even when the management of dimensional variations is relaxed. [Means for solving the problem]

[0006] The seat frame, which comprises a first frame (3) and a second frame (7) that form the framework of the vehicle seat and in which the first frame (3) and the second frame (7) are joined, desirably has at least one of the following constituent features:

[0007] That is, the constituent element is that a wrap portion (31) is provided on the outside of the portion of the first frame (3) corresponding to the end portion (71) of the second frame (7), and when an imaginary plane that contacts the wall portion (71A) continuing from the end portion (71) is taken as the projection plane, the wrap portion (31) projected onto the projection plane overlaps with a part of the end portion (71) and the wall portion (71A) projected onto the projection plane.

[0008] As a result, in this seat frame, even if the gap dimension between the end of the first frame (3) and the end (71) of the second frame (7) varies, it is possible to prevent at least the terminal of the second frame (7) from coming into contact with other objects.

[0009] The back frame of the vehicle seat includes 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), and a back frame having 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 wrap portion (31) is provided on the outside of the portion corresponding to the end portion (71), and when an imaginary plane that contacts the wall portion (71A) continuing from the extension direction end portion (71) is taken as a projection plane, it is desirable that the wrap portion (31) projected onto the projection plane overlaps with a part of the extension direction end portion (71) and the wall portion (71A) projected onto the projection plane.

[0010] As a result, even if the gap dimension between the end of the first side frame (3) and the end (71) of the upper frame 7 varies, the back frame can prevent at least the end of the upper frame (7) from coming into contact with other objects.

[0011] The back frame may have the following configuration. That is, it is desirable that the flange portion (72) forms the upper end of the upper frame (7) and has a portion that is approximately parallel to the front-to-rear direction of the seat, and that the flange portion (72) has an extension end portion (71) of the upper frame (7) and a wall portion (71A), and that the wall portion (71A) is inclined so that it becomes lower as it approaches the extension end portion (71).

[0012] This can prevent the end of the upper frame (7) from coming into contact with other objects, and the end of the first side frame (3) from coming into contact with other objects. In addition, it is desirable that the wall-like portion extending from the end (32) of the lap portion (31) be approximately parallel to the sheet width direction or be inclined so as to become lower as it approaches the end (32) of the lap portion (31).

[0013] This can reliably prevent the terminals of the upper frame (7) and the first side frame (3) from coming into contact with other objects. Note that "a portion substantially parallel to the seat width direction" refers to a state in which the elevation angle of the portion is 30 degrees or less, for example.

[0014] It is desirable that the wrap portion (31) be configured in a bag shape having a first wall portion (31A) located on the front side, a second wall portion (31B) located on the rear side, and a third wall portion (31C) having a surface facing the projection surface.

[0015] In the back frame, the joint between the second side frame (5) and the upper frame (7) may have the same structure as the joint between the first side frame (3) and the upper frame (7).

[0016] 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]

[0017] [Figure 1] FIG. 2 is a diagram showing a back frame according to the first embodiment. [Figure 2] 4A and 4B are diagrams showing the structure of a joint between a first side frame and an upper frame. [Figure 3] 4A and 4B are diagrams showing the structure of a joint between a first side frame and an upper frame. [Figure 4] 4A and 4B are diagrams showing the structure of a joint between a first side frame and an upper frame. [Figure 5] 4A and 4B are diagrams showing the structure of a joint between a first side frame and an upper frame. DETAILED DESCRIPTION OF THE INVENTION

[0018] 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.

[0019] This embodiment is an example in which a back frame according to the present disclosure is applied to a seat (hereinafter referred to as a vehicle seat) mounted in a vehicle such as a car. Lines and the like are drawn to facilitate understanding of the relationships between the drawings and the shapes of components or parts.

[0020] 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.

[0021] 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.

[0022] (First embodiment) <1.Back frame overview> As shown in Fig. 1, the back frame 1 is an example of a seat frame having a substantially rectangular frame shape that constitutes the framework of the seat back. The seat back supports the back of a seated occupant. The back frame 1 is rotatably connected to the rear end of a cushion frame (not shown).

[0023] 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.

[0024] The second side frame 5 is disposed at a position offset in the seat width direction (to the left in FIG. 1) with respect to the first side frame 3. 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.

[0025] 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.

[0026] <2. Joint structure between side frame and upper frame> The back frame 1 according to this embodiment has a substantially bilaterally symmetrical structure. The following description will be given of the joining structure between the first side frame 3 and the upper frame 7 (part A in FIG. 1).

[0027] 2, a lap portion 31 is provided on the outside of a portion of the first side frame 3 that corresponds to an end portion 71 of the upper frame 7 in the extension direction. The "end portion 71" is the end portion of the flange portion 72 in the seat width direction (the left end in this embodiment).

[0028] The flange portion 72 is, for example, a wall-shaped portion 33 (see Figure 4) that forms the upper end of the upper frame 7 (see Figure 3) and is approximately parallel to the fore-and-aft direction of the seat, and extends forward from the rear end side of the upper frame 7.

[0029] The "outside" in the above "outside of the portion corresponding to the extending end 71" refers to the side opposite the "inside" across the inner edge of the back frame 1. The "inside" refers to the side opposite the space surrounded by the back frame 1.

[0030] 4, a virtual wall portion 71A extending from the end portion 71 in the extending direction is in contact with the virtual wall portion 71A. When the plane is taken as a projection plane S, the wrap portion 31 projected onto the projection plane S overlaps with the extending direction end portion 71 and a part of the wall portion 71A projected onto the projection plane S, as shown in FIG.

[0031] In other words, when an observer observes part A in Figure 1 from the arrow view B shown in Figure 4, the observer sees the extension direction end 71 and part of the wall portion 71A overlapping with the wrap portion 31, so that the wrap portion 31 is positioned in front, as shown in Figure 2.

[0032] Specifically, the wall portion 71A, i.e., the projection surface S, is inclined so as to become lower as it approaches the extension direction end 71, and the wall-like portion 33 continuing from the end 32 of the lap portion 31 is inclined so as to be substantially parallel to the seat width direction or to become lower as it approaches the end 32. Note that "the portion 33 is substantially parallel to the seat width direction" means that the elevation angle of the portion 33 is, for example, 30 degrees or less.

[0033] In other words, the wrap portion 31 overlaps with the extension end portion 71 and a portion of the wall portion 71A so as to cover them from the outside, and the wall portion 71A extends downward on the left end side so as to slip under the wrap portion 31.

[0034] 5, the wrap portion 31 is configured in a bag shape and has a first wall portion 31A, a second wall portion 31B, and a third wall portion 31C. The first wall portion 31A is a wall portion located on the front side of the flange portion 72.

[0035] The second wall portion 31B is a wall portion located rearward of the flange portion 72. The third wall portion 31C is a wall portion having a surface facing the projection plane S. The third wall portion 31C is inclined in the same direction as the wall portion 71A.

[0036] 3. Features of the back frame according to this embodiment A wrap portion 31 is provided on the outside of the portion of the first side frame 3 corresponding to the extending end portion 71 of the upper frame 7, and the wrap portion 31 projected onto the projection plane S overlaps with the extending end portion 71 projected onto the projection plane S and a portion of the wall portion 71A (see Figure 4).

[0037] As a result, in the back frame 1, even if the gap dimension between the end 32 of the first side frame 3 and the end 71 of the upper frame 7 varies, it is possible to prevent at least the terminal of the upper frame 7 from coming into contact with other objects.

[0038] The wall portion 71A is inclined so that it becomes lower as it approaches the extension direction end 71, and the wall-like portion 33 continuing from the end 32 of the wrap portion 31 is inclined so that it is approximately parallel to the sheet width direction or becomes lower as it approaches the end 32 of the wrap portion 31 (see Figure 4).

[0039] This can prevent the terminals of the upper frame 7 and the first side frame 3 from coming into contact with other objects. (Other embodiments) In the above-described embodiment, the first side frame 3 is the first frame and the upper frame 7 is the second frame, and the present disclosure is applied to a joining structure between the first side frame 3 and the upper frame 7. However, the present disclosure is not limited to this. In other words, the present disclosure can also be applied to other joining structures.

[0040] In the above-described embodiment, the wrap portion 31 is provided on the first side frame 3. However, the present disclosure is not limited to this. That is, the present disclosure may also be configured such that the wrap portion 31 is provided on the upper frame 7, that is, the width direction end of the upper frame 7 is located outside the first side frame 3.

[0041] 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.

[0042] 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]

[0043] 1... Back frame 3... First side frame 5... Second side frame 7... Upper frame 9... Lower frame 31... Wrap section

Claims

1. A seat frame including a first frame and a second frame that constitute a framework of a vehicle seat, the first frame and the second frame being joined together, a wrap portion is provided on the outside of a portion of the first frame corresponding to an end of the second frame, When a virtual plane that contacts the wall portion continuing from the end portion is defined as a projection plane, The lap portion projected on the projection surface overlaps with the end portion and a portion of the wall portion projected on the projection surface.

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 the 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 wrap portion is provided on the outside of a portion of the first side frame corresponding to an end portion of the upper frame in an extension direction, When a virtual plane that contacts the wall portion continuing from the end portion in the extension direction is defined as a projection plane, A back frame in which the lap portion projected on the projection surface overlaps with the extension direction end portion and a part of the wall portion projected on the projection surface.

3. a flange portion that forms an upper end of the upper frame and has a portion that is substantially parallel to the seat front-rear direction, the flange portion having an end portion in the extension direction, The back frame according to claim 2 , wherein the wall portion is inclined so as to become lower as it approaches the end portion in the extension direction.

4. The back frame according to claim 3 , wherein the wall-like portion extending from the end of the lap portion is substantially parallel to the seat width direction or is inclined so as to become lower as it approaches the end of the lap portion.

5. The back frame according to claim 4, wherein the wrap portion is configured in a bag shape having a first wall portion located on the front side, a second wall portion located on the rear side, and a third wall portion having a surface facing the projection surface.

Images