Seat back

Abstract

To provide a seat back that can inhibit a seat belt from being damaged even when the seat belt comes into contact with a second bracket.SOLUTION: A seat back 1 includes a curve surface part 11A provided in a part of a second bracket 11 where a clearance to a seat belt 3 is smallest (part of upper end side of second bracket 11 in FIG.2). Accordingly, the seat back can inhibit the seat belt 3 from being damaged as compared to that when the part is configured to be an edge-shaped corner part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a seat back incorporating a retractor for a seat belt.

Background Art

[0002] For example, in the invention described in Patent Document 1, a belt guide case extending from the belt outlet of the retractor to the shoulder is provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The retractor needs to receive the tension acting on the seat belt. For this reason, generally, a first bracket is connected to the side of the retractor opposite to the belt outlet, and a second bracket is connected to the belt outlet side.

[0005] The first bracket is a metal member that receives the above tension. The second bracket is a metal member that holds the posture of the retractor, and is formed by press-molding a metal plate material into a substantially L shape. By the way, when a large tension acts on the seat belt, there is a possibility that the seat belt (also referred to as webbing) extending upward from the belt outlet may come into contact with the second bracket. And when the seat belt comes into contact with an edge portion such as a corner portion of the second bracket, the seat belt may be damaged.

[0006] In view of the above points, the present disclosure discloses an example of a seat back that can suppress damage to the seat belt even when the seat belt comes into contact with the second bracket.

Means for Solving the Problems

[0007] A seatback incorporating a retractor (5) for a seat belt is preferably provided with at least one of the following configuration requirements: In other words, the constituent element comprises a first bracket (9) that receives tension acting on the retractor (5) via the seat belt, and a second bracket (11) provided on the belt outlet (5A) side of the retractor (5) and maintaining the posture of the retractor (5), wherein the part of the second bracket (11) that is closest to the seat belt is formed of a curved surface.

[0008] As a result, if the seat belt comes into contact with the second bracket (11), the part of the second bracket (11) that the seat belt contacts will be the part that is closest to the seat belt.

[0009] Furthermore, since the seat back is constructed with a curved surface, damage to the seat belt can be reduced compared to a corner that is constructed with an edge.

[0010] The seatback may also have the following configuration, for example: In other words, the upper end of the second bracket (11) is the part with the smallest distance from the seat belt, and it is desirable that the second bracket (11) is configured to have a bracket body (11B) having a surface that intersects with the front-rear direction of the seat, and a flange portion (11C) extending from the upper end of the bracket body (11B) in a direction intersecting with the bracket body (11B), and the flange portion (11C) being connected to the bracket body (11B) via a curved surface.

[0011] As a result, the bracket body (11B) and flange portion (11C) of the seat back can be formed by plastic deformation such as press working, thus preventing a significant increase in the manufacturing cost of the second bracket (11).

[0012] Furthermore, it is desirable that the second bracket (11) has a roughly L-shaped form when projected onto a horizontal plane, and that the flange portion (11C) extends over substantially the entire upper end of the second bracket (11). This can further suppress damage to the seat belt.

[0013] Incidentally, the symbols in each of the parentheses above are just examples showing the correspondence with the specific configurations etc. described in the embodiments described later, and this disclosure is not limited to the specific configurations etc. indicated by the symbols in the parentheses above. [Brief explanation of the drawing]

[0014] [Figure 1] This is a diagram showing the seat back according to the first embodiment. [Figure 2] This is a partially enlarged view of the seat back according to the first embodiment. [Figure 3] This diagram shows the positional relationship between the seat belt and the second bracket. [Figure 4] This figure shows the second bracket according to the first embodiment. [Figure 5] This figure shows the second bracket according to the first embodiment. [Figure 6] This figure shows the second bracket according to the second embodiment. [Modes for carrying out the invention]

[0015] The following "Embodiments of the Invention" are examples of embodiments that fall within the technical scope of this disclosure. In other words, the features defining the invention as described in the claims are not limited to the specific configurations and structures shown in the embodiments below.

[0016] This embodiment is an example in which the seat back of the present disclosure is applied to the seat back of a seat installed in a vehicle or other vehicle (hereinafter referred to as a vehicle seat). The seat back is the part that supports the back of the seated person.

[0017] The arrows, slashes, etc. indicating the directions attached to each figure are described to facilitate understanding of the relationships between the figures and the shapes of members or parts. Therefore, the seat back is not limited to the directions attached to each figure.

[0018] Note that the directions shown in each figure are the directions in the state where the vehicle seat is assembled to the vehicle. The figure with slashes does not necessarily show a cross-sectional view. At least one member or part that is marked with a reference numeral and described is provided at least one, unless otherwise stated such as "one".

[0019] That is, when there is no statement such as "one", the member may be provided in two or more. The seat back shown in the present disclosure includes components such as at least the members or parts that are marked with a reference numeral and described, and the illustrated structural parts.

[0020] (First Embodiment) <1. Overview of the Seat Back> As shown in FIG. 1, the seat back 1 according to the present embodiment is a seat back in which a retractor 5 is incorporated. Incidentally, the seat back 1 is, for example, the seat back of the rear right seat of a five-seater vehicle.

[0021] In addition to the retractor 5, the seat back 1 includes at least a back frame 7, a first bracket 9, a second bracket 11, and a belt guide 13. The back frame 7 is a member that constitutes the skeleton of the seat back 1.

[0022] The back frame 7 according to the present embodiment has two side frames 7A, 7B and two connecting members 7C, 7D, and is configured in a rectangular frame shape. The side frame 7A is a metal member that is disposed on one end side in the seat width direction of the seat back 1 and extends in the vertical direction.

[0023] The side frame 7B is a metal member positioned on the other end of the seat back 1 in the seat width direction and extending vertically. The connecting member 7C is a metal member that extends in the seat width direction and connects the upper ends of the side frames 7A and 7B, respectively.

[0024] The connecting member 7D is a metal component that extends in the seat width direction and connects the side frames 7A and 7B below the connecting member 7C. The retractor 5 is capable of winding up the seat belt 3 and receiving the tension acting on the seat belt 3.

[0025] The first bracket 9 is a member that receives tension acting on the retractor 5 via the seat belt 3. Specifically, the first bracket 9 extends from the connecting member 7D side to the connecting member 7C side, with one end in the longitudinal direction connected to the back frame 7 and the other end in the longitudinal direction connected to the retractor 5.

[0026] Specifically, the lower end of the first bracket 9 is connected to the connecting member 7D. The upper end of the first bracket 9 is connected to the side of the retractor 5 opposite the belt discharge port 5A (see Figure 2), that is, the lower side of the retractor 5.

[0027] In this embodiment, the lower end of the first bracket 9 is welded to the connecting member 7D. The upper end of the first bracket 9 is connected to the retractor 5 via a bolt 9A. Therefore, the retractor 5 may change its orientation around the bolt 9A.

[0028] The second bracket 11 is provided on the belt outlet 5A side of the retractor 5, that is, on the upper side of the retractor 5, and maintains the posture of the retractor 5. "Maintaining the posture of the retractor 5" means, for example, maintaining the orientation of the belt outlet 5A in a predetermined direction.

[0029] Incidentally, since the retractor 5 according to this embodiment is connected to the first bracket 9 by a single bolt 9A, if the second bracket 11 were to be eliminated, the retractor 5 may rotate around the bolt 9A.

[0030] The second bracket 11 extends in the seat width direction, with one end connected to the retractor 5 and the other end connected to the back frame 7. Specifically, one end of the second bracket 11 is connected to the retractor 5 with a bolt 5B, and the other end is welded to the side frame 7B.

[0031] The belt guide 13 receives the tension generated in the seat belt 3 and transmits that tension to the back frame 7. That is, when the seat belt 3 is in use, the seat belt 3 extends diagonally downward from the belt guide 13 (as shown by the dashed line).

[0032] Therefore, when tension is generated in the seat belt 3, at least a forward and downward load acts on the belt guide 13. This load is then transmitted to the back frame 7 via the connecting member 7C to which the belt guide 13 is fixed.

[0033] <2. Details of the second bracket> As shown in Figure 3, a curved portion 11A is provided at the part of the second bracket 11 that is closest to the seat belt 3 (in this embodiment, the upper end portion of the second bracket 11).

[0034] The curved portion 11A is a part composed of a curved surface that is convex on the seat belt 3 side. Note that "composed of a curved surface that is convex on the seat belt 3 side" means that "the center of curvature O of the curved surface is located on the opposite side of the curved surface from the seat belt 3."

[0035] Specifically, as shown in Figure 4, the second bracket 11 is configured to include at least a bracket body 11B and a flange portion 11C, etc. The bracket body 11B is a strip-shaped portion having a surface that intersects with the front-rear direction of the seat.

[0036] The flange portion 11C is a portion that extends from the upper end of the bracket body 11B in a direction intersecting the bracket body 11B, and is connected to the bracket body 11B via a curved surface. The curved surface connecting the bracket body 11B and the flange portion 11C is the curved surface portion 11A.

[0037] Furthermore, the second bracket 11 has a roughly L-shaped form when projected onto a horizontal plane (see Figure 5). The flange portion 11C, or curved portion 11A, is provided over substantially the entire upper end of the second bracket 11 (see Figure 4).

[0038] The shorter portion 11D of the roughly L-shaped second bracket 11 is the part that is welded and fixed to the side frame 7B. The tip of the longer portion 11E of the roughly L-shaped second bracket 11 is the part to which the retractor 5 is connected. The bead portion 11F is a bulge that reinforces the bending strength between portion 11D and portion 11E.

[0039] <3. Features of the seat back (particularly the second bracket) according to this embodiment> If the seat belt 3 and the second bracket 11 come into contact, the part of the second bracket 11 that the seat belt 3 makes contact with is the part that is closest to the seat belt 3.

[0040] In contrast, in this embodiment, a curved portion 11A is provided at the part of the second bracket 11 that is closest to the seat belt 3 (in this embodiment, the upper end portion of the second bracket 11). Therefore, in this embodiment, damage to the seat belt 3 can be suppressed compared to when that portion is an edge-shaped corner.

[0041] The second bracket 11 has a bracket body 11B and a flange portion 11C, and the bracket body 11B and the flange portion 11C are connected via a curved surface portion 11A.

[0042] As a result, in this embodiment, the bracket body 11B and flange portion 11C can be formed by plastic deformation such as press working, thus suppressing a significant increase in the manufacturing cost of the second bracket 11.

[0043] Furthermore, the flange portion 11C, or curved portion 11A, is provided over substantially the entire upper end of the second bracket 11. This makes it possible to suppress damage to the seat belt 3 regardless of which part of the upper end the seat belt 3 comes into contact with.

[0044] (Second Embodiment) In the embodiment described above, the flange portion 11C, or curved portion 11A, was provided over substantially the entire upper end of the second bracket 11 (see Figure 4). In contrast, in this embodiment, the flange portion 11C, or curved portion 11A, is provided only in portion 11E, as shown in Figure 6.

[0045] Note that components identical to those in the above-described embodiments are denoted by the same reference numerals. Therefore, redundant explanations are omitted in this embodiment. (Other embodiments) The curved portion 11A in the above-described embodiment was formed by bending the upper end of the second bracket 11. However, the disclosure is not limited thereto. That is, the disclosure may also include a structure in which, for example, a resin cap constituting the curved portion 11A is placed over the upper end of the bracket body 11B.

[0046] In the embodiment described above, the second bracket 11 was formed by press-forming a strip of material, and the upper end of the second bracket 11 was bent to form a curved surface portion 11A. However, the disclosure is not limited thereto.

[0047] In other words, the disclosure may also indicate that the second bracket 11 is made of a round pipe, a square pipe with rounded corners, or a half-pipe material in which the cross-sectional shape of the bracket body 11B is substantially C-shaped. This is because, with these configurations, "at least the part of the second bracket 11 that is closest to the seat belt 3 is made of a curved surface."

[0048] The second bracket 11 in the embodiment described above was made of metal. However, this disclosure is not limited thereto. That is, the disclosure may also include, for example, "a resin second bracket in which at least the portion with the smallest distance from the seat belt 3 is formed of a curved surface."

[0049] In the second bracket 11 according to the embodiment described above, portion 11D was located on the rear side of the seat relative to portion 11E. However, the disclosure is not limited thereto. That is, the disclosure may also be configured such that portion 11D is fixed to the back frame 7 with portion 11D located on the front side of the seat relative to portion 11E.

[0050] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least two of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of symbols]

[0051] 1… Seat back 3… Seat belt 5… Retractor 7… Back frame 9… First bracket 11… Second bracket 11A…Curved surface part

Claims

[Claim 1] In a seatback with a built-in retractor for the seat belt, Two side frames are positioned on one end and the other end of the seat in the width direction, and extend in the vertical direction. A first connecting member extending in the width direction of the seat and connecting the upper ends of each of the two side frames, A second connecting member extending in the width direction of the sheet and connecting the lower sides of the two side frames below the first connecting member, A first bracket that receives tension acting on the retractor via a seat belt, the first bracket extending substantially vertically, with its lower end connected to the second connecting member and its upper end connected to the lower side of the retractor, A second bracket provided on the belt discharge port side of the retractor and for maintaining the posture of the retractor, the second bracket extending in the seat width direction, with one end connected to the upper side of the retractor and the other end connected to the side frame located on the other end in the seat width direction, The second bracket is, A bracket body having a surface that intersects with the front-to-back direction of the seat, and A flange portion extending from the upper end of the bracket body in a direction intersecting the bracket body, having a flange portion connected to the bracket body via a curved surface, Furthermore, the upper end portion of the second bracket is a seatback formed with a curved surface that is convex on the seat belt side.

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