Seat back

Abstract

The first oblique bead portion 33A has a protruding shape that protrudes from the plate surface of the back panel 3 in the plate thickness direction and extends in a direction inclined with respect to the seat-width direction and the up-down direction, and the second oblique bead portion 33A has a protruding shape that protrudes from the plate surface of the back panel 3 in the plate thickness direction and extends in a direction inclined with respect to the seat-width direction and the up-down direction, the second oblique bead portion 33B being provided at a position diagonal to the first oblique bead portion 33B in the back panel 3. Accordingly, deformation of the back panel 3 such that the virtual line Ln becomes a neutral line can be suppressed. As a result, in the back frame 2, the free portion F can be prevented from being largely displaced in the direction of the external force.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] For example, in the back frame described in Patent Document 1, the upper part of one widthwise end of the back frame is fixed to the vehicle, and the lower parts of both the one widthwise end and the other widthwise end of the back frame are rotatably connected to the vehicle. In other words, the back frame described in Patent Document 1 has a structure in which it is connected to the vehicle at only three of its four corners. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-74390 Summary of the Invention [Problem to be solved by the invention]

[0004] In a back frame that is connected to a vehicle at three points, when an external force acts on the back frame in the front-to-rear direction, there is a risk that the unconnected points will be significantly displaced. This disclosure discloses an example of a seat back that takes this into consideration. [Means for solving the problem]

[0005] It is desirable that the seat back of a vehicle seat have at least one of the following constituent features, for example. That is, the constituent elements include a substantially rectangular plate-shaped back panel (3) that constitutes a part of the back frame (2), a fixed portion (21) that is provided above one end side of the back frame (2) in the width direction and is fixed to the vehicle, a first connecting portion (22) and a second connecting portion (23) that are provided below one end side and the other end side of the back frame (2) in the width direction and are rotatably connected to the vehicle, and a first oblique bead portion ( a first oblique bead portion (33A) in the form of a protrusion that protrudes from the plate surface of the back panel (3) in the plate thickness direction and extends in a direction inclined relative to the seat width direction and the up-down direction; and a second oblique bead portion (33B) in the form of a protrusion that is provided at a diagonal position on the back panel (3) relative to the first oblique bead portion (33A), and that protrudes from the plate surface of the back panel (3) in the plate thickness direction and extends in a direction inclined relative to the seat width direction and the up-down direction.

[0006] As a result, even if an external force acts on the back frame in the fore-and-aft direction, the portions of the seat back that are not connected to the vehicle can be prevented from being significantly displaced in the fore-and-aft direction.

[0007] That is, in the back frame, the positions of the fixed portion (21), the first connecting portion (22) and the second connecting portion (23) are constrained by the vehicle, and the portions not connected to the vehicle (hereinafter referred to as free portions) are not constrained.

[0008] Therefore, when an external force acts on the back frame in the front-to-rear direction, the free point tries to displace in the direction of the external force so that the imaginary line connecting the fixed part (21) and the connecting part (for example, the second connecting part (23)) located diagonally opposite the fixed part (21) becomes a neutral line.

[0009] On the other hand, the back panel (3) of the back frame has a first oblique bead portion (3 The provision of the second oblique bead portion (33A) and the second oblique bead portion (33B) can prevent the back panel (3) from deforming in such a way that the imaginary line becomes the neutral line. As a result, the back frame can prevent free points from being displaced significantly in the direction of an external force.

[0010] The back frame may have the following configuration, for example. That is, the back panel 3 is provided with a plurality of vertical bead portions 34, and each of the vertical bead portions 34 is preferably formed as a protrusion extending in the up-down direction and protruding in the thickness direction from the plate surface of the back panel 3. This makes it possible to improve the rigidity of the back panel 3.

[0011] Furthermore, it is desirable that the back panel (3) has an attachment portion (6) to which a retractor (5) for winding up the seat belt webbing is attached, a beam portion (41) joined to the upper end side of the back panel (3) and extending in the seat width direction, and a receiving portion (45) provided on the beam portion (41) for receiving tension acting on the webbing (5A), and that the vertical bead portions (34C, 34D) adjacent to the attachment portion (6) among the multiple vertical bead portions (34) extend to a position overlapping with the beam portion (41). This can ensure the necessary rigidity around the receiving portion (45).

[0012] 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]

[0013] [Figure 1] FIG. 2 is a diagram showing a back frame according to the first embodiment. [Figure 2] FIG. 2 is an exploded view of the back frame according to the first embodiment. [Figure 3] FIG. 2 is a diagram showing a panel main body according to the first embodiment. [Figure 4]FIG. 2 is a view showing a curled portion according to the first embodiment. [Figure 5] FIG. 2 is a diagram showing a frame according to the first embodiment. [Figure 6] FIG. 2 is a diagram showing a back frame according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] 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.

[0015] This embodiment is an example in which a seat back according to the present disclosure is applied to a seat (hereinafter referred to as a vehicle seat) installed in 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.

[0016] Therefore, the seat back 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 this embodiment is assembled to a vehicle. Diagonally shaded drawings do not always represent cross-sectional views.

[0017] At least one of each 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 members may be provided. The seat backs shown in the present disclosure include at least one of the components, such as the members or portions, described with reference numerals, and the structural portions shown in the drawings.

[0018] (First embodiment) <1. Seatback Overview> As shown in Fig. 1, the seat back 1 according to this embodiment is a seat back used in the rear seat of a vehicle. The seat back 1 is a part that supports the back of a seated occupant. The seat back 1 is configured to include a back frame 2, a cushion (not shown), and a cover part (not shown).

[0019] The back frame 2 is a strength member that constitutes the framework of the seat back 1. The cushion is a shock-absorbing material made of urethane foam or the like. The surface portion is a cover that covers the cushion and the back frame 2.

[0020] The back frame 2 is provided with a fixing portion 21, a first connecting portion 22, a second connecting portion 23, etc. The fixing portion 21 is a portion that is fixed to the vehicle, and is provided at an upper side of one end of the back frame 2 in the width direction (at the upper right side in this embodiment).

[0021] Specifically, a latch device (not shown) that engages with a striker (not shown) provided on the vehicle is attached to the fixing portion 21. The latch device is a device that can switch between a state in which it is engaged with the striker and a state in which it is disengaged.

[0022] The first connecting portion 22 and the second connecting portion 23 are portions rotatably connected to the vehicle. The first connecting portion 22 is provided below one end side (the right end side in this embodiment) of the back frame 2 in the width direction.

[0023] The second connecting portion 23 is provided below the other widthwise end side (the left end side in this embodiment) of the back frame 2. The second connecting portion 23 is connected to the vehicle via a bracket 23A.

[0024] When the striker and the latch device are engaged, the seat back 1 is fixed to the vehicle in an upright position, as shown in Fig. 1. When the striker and the latch device are disengaged, the seat back 1 is able to fold and rotate forward about the first connecting portion 22 and the second connecting portion 23.

[0025] <2. Back frame configuration> As shown in Fig. 2, the back frame 2 includes at least a back panel 3 and a frame 4. The back panel 3 is a metal panel material having a substantially rectangular plate shape. The frame 4 is a metal skeleton having a rectangular frame shape. The frame 4 is joined to the back panel 3 (specifically, the panel main body 31 described below) by welding.

[0026] <2.1 Back panel details> The back panel 3 is configured to have at least a panel main body 31 and a curled portion 32. In this embodiment, the panel main body 31 (including bead portions 33 and 34, which will be described later) and the curled portion 32 are an integral product formed by applying plastic processing to a metal plate.

[0027] <Panel body> 3, the panel main body 31 is a generally rectangular plate-shaped portion provided with a plurality of bead portions 33, 34. Each of the plurality of bead portions 33, 34 is formed by a ridge that protrudes from the plate surface of the panel main body 31 in the plate thickness direction.

[0028] The bead portion 33 is configured to have a first oblique bead portion 33A and a second oblique bead portion 33B. As shown in FIG. 1, the first oblique bead portion 33A is provided in the panel main body 31, that is, in a position close to the fixing portion 21 of the back panel 3, and is It is composed of a protrusion extending in a direction inclined downward.

[0029] The second oblique bead portion 33B is provided in a diagonal position relative to the first oblique bead portion 33A on the panel main body 31, i.e., the back panel 3, and is configured as a protrusion extending in a direction inclined relative to the seat width direction and the up-down direction.

[0030] In other words, the first diagonal bead portion 33A is a rivet-shaped bead portion that connects the upper end edge of the back panel 3 to the right end edge of the back panel 3, and the second diagonal bead portion 33B is a rivet-shaped bead portion that connects the lower end edge of the back panel 3 to the left end edge of the back panel 3.

[0031] The plurality of bead portions 34 are bead portions configured with protrusions extending in the up-down direction (hereinafter, the bead portions 34 are referred to as vertical bead portions 34). Incidentally, when the seat back 1 is in a reclined position, the vertical bead portions 34 become protrusions extending in the front-to-rear direction of the vehicle.

[0032] The panel main body 31 according to this embodiment, that is, the back panel 3, is provided with a mounting portion 6 for a retractor 5. The retractor 5 is a device for winding up the webbing (belt portion) 5A of the seat belt.

[0033] Of the multiple vertical bead portions 34A to 34J, the vertical bead portions 34C, 34D adjacent to the mounting portion 6 extend to positions where they overlap with the upper beam portion 41 described below. Specifically, the vertical bead portions 34C, 34D extend to the upper edge of the panel main body 31, as shown in FIG.

[0034] The vertical bead portions 34C, 34D extend from at least a portion below the lower end of the mounting portion 6 to the upper edge of the panel main body 31. Incidentally, the vertical bead portions 34C, 34D according to this embodiment extend from the lower edge to the upper edge of the panel main body 31.

[0035] <Curled part> 4, the curled portion 32 is a portion of the outer edge of the panel main body 31 that is curved in an arc shape. Incidentally, "curved in an arc shape" refers to a structure in which the circumferential angle of the arc portion is, for example, 180° or more (in this embodiment, 270° or more).

[0036] 3, the curled portion 32 is provided on at least a portion of the outer edge of the panel main body 31 (in this embodiment, outer edge portions E1 and E2). As shown in FIG. 4, the entire curled portion 32 is shifted in the front-to-rear direction of the seat (toward the front in this embodiment) with respect to the panel main body 31.

[0037] Furthermore, connecting portion 32A connecting curled portion 32 and panel main body 31 is curved in an arc shape. The radius of an imaginary tangent circle S1 contacting curled portion 32 and connecting portion 32A is larger than the radius of curvature r1 of curled portion 32 and the radius r2 of connecting portion 32A.

[0038] <2.2 Frame details> 2, the frame 4 is configured in a rectangular frame shape that follows the outer edge of the panel main body 31. Specifically, it is configured to include an upper beam portion 41, a lower beam portion 42, a first side frame 43, and a second side frame 44.

[0039] The upper beam portion 41 is a frame that is joined to the upper end side of the back panel 3, i.e., the panel main body 31, and extends in the seat width direction. The upper beam portion 41 is provided with a receiving portion 45. As shown in FIG. 1, the receiving portion 45 is a portion that receives the tension acting on the webbing 5A.

[0040] As shown in FIG. 5, the receiving portion 45 according to this embodiment cooperates with the upper beam portion 41 to The receiving portion 45 forms a rectangular closed curved frame portion through which the webbing 5A is inserted. The tension acting on the receiving portion 45 is transmitted to the back frame 2 via the upper beam portion 41.

[0041] 2, the lower beam portion 42 is a frame joined to the lower end side of the panel main body 31 and extending in the seat width direction. The first side frame 43 and the second side frame 44 connect the extension direction end of the upper beam portion 41 and the extension direction end of the lower beam portion 42.

[0042] 5, gusset plates 46A to 46D are joined to the respective connecting portions of the upper beam portion 41, the lower beam portion 42, the first side frame 43, and the second side frame 44. The gusset plates 46A to 46D are reinforcing plates that reinforce the connections.

[0043] In this embodiment, the cross-sectional shapes of the upper beam portion 41, the lower beam portion 42, and the second side frame 44 are configured to be approximately C-shaped or U-shaped with an opening on the rear side. These openings are closed by the panel main body 31.

[0044] The first side frame 43 is configured to have a rectangular closed cross-sectional shape by itself. This is because the first side frame 43 is provided with the fixing portion 21. The panel main body 31 according to this embodiment is also joined to the back surface of the first side frame 43.

[0045] 3. Features of the seat back according to this embodiment In the back frame 2 of this embodiment, the positions of the fixed portion 21, the first connecting portion 22 and the second connecting portion 23 are constrained by the vehicle, and the portion not connected to the vehicle (hereinafter referred to as the free portion F (see Figure 6)) is not constrained.

[0046] Therefore, when an external force in the front-to-rear direction acts on the back frame 2, the free point F tends to displace in the direction of the external force so that the imaginary line Ln connecting the fixed part 21 and the second connecting part 23 located diagonally therefrom becomes a neutral line, as shown in Figure 6.

[0047] In contrast, the back panel 3 of the back frame is provided with the first diagonal bead portion 33A and the second diagonal bead portion 33B, which can suppress deformation of the back panel 3 such that the virtual line Ln becomes the neutral line. As a result, in the back frame 2, the free point F can be suppressed from being largely displaced in the direction of the external force.

[0048] The back panel 3 is provided with a plurality of vertical bead portions 34, each of which is formed by a protrusion that protrudes in the thickness direction from the plate surface of the back panel 3 and extends in the up-down direction. This makes it possible to improve the rigidity of the back panel 3.

[0049] Furthermore, when the seat back 1 is folded forward to be used as part of the luggage compartment, the vertical bead portions 34 become protrusions extending in the fore-and-aft direction of the vehicle, allowing the user to easily slide cargo placed in the luggage compartment in the fore-and-aft direction.

[0050] Incidentally, if multiple bead portions were configured to extend in the seat width direction, when sliding cargo placed in the luggage compartment in the forward / backward direction, the cargo would get caught on the multiple bead portions, making it difficult for the user to easily slide the cargo in the forward / backward direction.

[0051] Of the multiple vertical bead portions 34, the vertical bead portions 34C, 34D adjacent to the mounting portion 6 extend to positions where they overlap with the beam portion 41. This makes it possible to ensure the necessary rigidity around the receiving portion 45.

[0052] (Other embodiments) In the above-described embodiment, the panel main body 31 is provided with the curled portion 32. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the curled portion 32 is eliminated.

[0053] In the above-described embodiment, the curled portion 32 is configured to be located on the front side of the panel main body 31. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the curled portion 32 is located on the rear side of the panel main body 31, or such that the center of the curled portion 32 is located on an extension of the panel main body 31.

[0054] In the above-described embodiment, the panel body 31 is configured to have a plurality of bead portions 33, 34. However, the positions and extending directions of the plurality of bead portions 33, 34 according to the present disclosure are not limited to the configuration shown in FIG.

[0055] 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.

[0056] 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]

[0057] 1... Seat back 2... Back frame 3... Back panel 21…Fixed part 22... 1st connection part 23…Second connection part 33A... First diagonal bead section 33B... Second diagonal bead section

Claims

1. In the seat back of a vehicle seat, a substantially rectangular plate-shaped back panel that constitutes a part of the back frame; a fixing portion provided above one widthwise end of the back frame and fixed to the vehicle; a first connecting portion and a second connecting portion provided below one end side and the other end side of the back frame in the width direction, respectively, and rotatably connected to the vehicle; a first oblique bead portion provided in a position of the back panel close to the fixed portion, the first oblique bead portion having a protruding stripe shape that protrudes from a plate surface of the back panel in a plate thickness direction and extends in a direction inclined with respect to the seat width direction and the up-down direction; a second oblique bead portion provided in a diagonal position of the back panel relative to the first oblique bead portion, the second oblique bead portion having a protruding stripe shape that protrudes from the plate surface of the back panel in a plate thickness direction and extends in a direction inclined with respect to the seat width direction and the up-down direction; A seat back equipped with:

2. The back panel is provided with a plurality of vertical bead portions, 2. The seat back according to claim 1, wherein each of the plurality of vertical bead portions is formed as a protrusion that protrudes from a plate surface of the back panel in a plate thickness direction and extends in a vertical direction.

3. a mounting portion provided on the back panel to which a retractor for retracting a seat belt webbing is attached; a beam portion joined to an upper end side of the back panel and extending in the seat width direction; a receiving portion provided on the beam portion and receiving a tension acting on the webbing, The seat back according to claim 2 , wherein the vertical bead portion adjacent to the mounting portion among the plurality of vertical bead portions extends to a position where it overlaps with the beam portion.

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