Vehicle seats

Abstract

To obtain a vehicle seat that can comply with the regulations regarding protrusions inside the vehicle. [Solution] The vehicle seat 10 comprises a back frame body 22 and a bracket 24 joined to the back frame body 22. The back frame body 22 has a pair of left and right side frame portions 26 and an upper frame portion 28 that is stretched between the upper ends of the left and right side frame portions 26 and joined to the upper ends of the left and right side frame portions 26 in an overlapping state. The bracket 24 has a curved portion 24D that extends along a stepped portion 32 formed between the upper ends of the side frame portions 26 and the upper frame portion 28 and is curved. A spherical member 34 with a diameter of 165 mm is in contact with the curved portion 24D and the back frame body 22, and is set so that the spherical member 34 is separated from the stepped portion 32.

Description

Technical Field

[0001] The present invention relates to a vehicle seat.

Background Art

[0002] Patent Document 1 below discloses a vehicle seat configured to include a back frame in which an upper end portion of a side frame and an end portion in the seat width direction of an upper frame are overlapped and joined.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, depending on the shape and dimensions of a protrusion (step) generated between a side frame and an upper frame, it is conceivable that the requirements of the vehicle interior protrusion regulations (for example, the requirements of Interior Equipment Regulation ECER21) cannot be satisfied.

[0005] In consideration of the above fact, an object of the present invention is to obtain a vehicle seat that can satisfy the vehicle interior protrusion regulations.

Means for Solving the Problems

[0006] The first embodiment of the vehicle seat comprises a back frame body that constitutes the main part of the seat back frame that supports the back of the seated occupant from the rear side of the seat, and has a curved portion that extends along the stepped portion formed between the seat-upper end of the left and right side frame portions and is joined in an overlapping state with the seat-upper end of the left and right side frame portions, and a back frame body that has a curved portion that extends along the stepped portion formed between the seat-upper end of the side frame portion and the upper frame portion and is joined to the back frame body, and a spherical member with a diameter of 165 mm is set to be in contact with the curved portion and the back frame body, so that the spherical member is separated from the stepped portion.

[0007] In the first embodiment of the vehicle seat, the upper end of the side frame portion that constitutes the back frame body and the upper frame portion are overlapped and joined, thereby creating a stepped portion between the upper end of the side frame portion and the upper frame portion. A bracket having a curved portion that extends along the stepped portion is joined to the back frame body. A spherical member with a diameter of 165 mm is in contact with the curved portion of the bracket and the back frame body, and the spherical member is set to be spaced apart from the stepped portion. This satisfies the regulations on protrusions inside the vehicle interior, which stipulate that the spherical member must not come into contact with the stepped portion.

[0008] A vehicle seat in a second embodiment is a vehicle seat in a first embodiment in which the upper frame portion comprises a pair of left and right side portions extending toward the upper end of the left and right side frame portions, and the bracket is joined to the left and right side portions in a manner that it is stretched between the left and right side portions.

[0009] In the second embodiment of the vehicle seat, the bracket is joined to the left and right side portions of the upper frame portion, with the bracket being stretched between them. This configuration improves the strength and rigidity of the back frame body at the points corresponding to the left and right side portions of the upper frame portion, compared to a configuration in which the bracket is not stretched between the left and right side portions of the upper frame portion. [Effects of the Invention]

[0010] The vehicle seat according to the present invention has the excellent effect of being able to comply with the regulations concerning protrusions inside the vehicle. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view showing the vehicle seat of this embodiment. [Figure 2] This is a perspective view of the back frame from the rear at an angle. [Figure 3] This is a side view showing a magnified portion of the back frame. [Figure 4] This is a rear view showing a magnified portion of the back frame. [Modes for carrying out the invention]

[0012] An embodiment of the vehicle seat 10 of the present invention will be described with reference to Figures 1 to 4. In the figures, arrow FR indicates the front side of the seat, arrow UP indicates the upper side of the seat, arrow RH indicates the right side in the seat width direction, and arrow LH indicates the left side in the seat width direction. Furthermore, in the following description, unless otherwise specified, when the front / rear, up / down, and left / right directions are indicated, they refer to the front / rear direction of the seat, the up / down direction of the seat, and the left / right direction in the seat width direction.

[0013] As shown in Figure 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the seated occupant's buttocks from below, a seat back 14 that supports the seated occupant's back from the rear, and a headrest 16 that supports the seated occupant's head from the rear.

[0014] The seat back 14 is composed of a back frame 18 that constitutes the frame of the seat back 14, and a back pad 20 attached to the back frame 18.

[0015] As shown in Figure 2, the back frame 18 is composed of a back frame body 22 which constitutes the main part of the back frame 18, and a bracket 24 attached to the back frame body 22.

[0016] The back frame body 22 comprises a pair of left and right side frame sections 26 that are spaced apart in the seat width direction and extend vertically, and an upper frame section 28 that spans between the upper ends of the pair of left and right side frame sections 26.

[0017] As shown in Figures 2 to 4, the side frame portion 26 is formed, for example, by press working on a steel plate. This side frame portion 26 includes a side wall portion 26A that extends vertically with the left-right direction as the thickness direction, a front wall portion 26B that bends inward in the sheet width direction from the front end of the side wall portion 26A, and a rear wall portion 26C that bends inward in the sheet width direction from the rear end of the side wall portion 26A. The side frame portion 26 also includes a semi-cylindrical portion 26D that protrudes upward from the upper end of the side wall portion 26A, the outer part in the sheet width direction at the upper end of the front wall portion 26B, and the outer part in the sheet width direction at the upper end of the rear wall portion 26C. This semi-cylindrical portion 26D is formed in a semi-cylindrical shape with the inner side in the sheet width direction open. A welding hole 26E is formed on the side of the side wall portion 26A that penetrates the side wall portion 26A. This welding hole 26E is formed as an elongated hole with its longitudinal direction aligned with the axial direction of the semi-cylindrical portion 26D.

[0018] The upper frame portion 28 is formed, for example, by bending a cylindrical steel pipe. This upper frame portion 28 includes a center portion 28A that extends in the sheet width direction, and a pair of left and right inclined portions 28B that extend downward from both ends of the center portion 28A in the sheet width direction and inclinate outward in the sheet width direction. The upper frame portion 28 also includes a pair of left and right side portions 28C that extend downward from the ends of the left and right inclined portions 28B opposite to the center portion 28A.

[0019] The left side portion 28C of the upper frame portion 28 is positioned inward in the sheet width direction relative to the upper ends of the semi-cylindrical portion 26D and the side wall portion 26A of the left side frame portion 26. The left side portion 28C of the upper frame portion 28 and the upper ends of the semi-cylindrical portion 26D and the side wall portion 26A of the left side frame portion 26 are joined by welding, overlapping each other in the sheet width direction. In this embodiment, the left side portion 28C and the upper end of the side wall portion 26A of the left side frame portion 26 are joined via a first welding bead 30A formed on the edge of the welding hole 26E. Furthermore, the left side portion 28C and the front end of the semi-cylindrical portion 26D of the left side frame portion 26 are joined via a second welding bead 30B. In addition, the left side portion 28C and the rear end of the semi-cylindrical portion 26D of the left side frame portion 26 are joined via a third welding bead 30C. Furthermore, the right side section 28C and the right side frame section 26 are joined in the same manner as the left side section 28C and the left side frame section 26.

[0020] The bracket 24 is formed, for example, by subjecting a steel plate material to press working or the like. This bracket 24 includes a center portion 24A extending in the left - right direction, and a pair of left - right inclined portions 24B that extend while inclining outward in the sheet width direction from both ends in the sheet width direction of the center portion 24A toward the front side. Further, the bracket 24 includes a pair of left - right side portions 24C that extend outward in the sheet width direction from the ends on the side opposite to the center portion 24A in the pair of left - right inclined portions 24B. The portions on the outer side in the sheet width direction of the pair of left - right side portions 24C are curved portions 24D that are bent along the rear surface and the outer surface in the sheet width direction of the pair of side portions 28C of the upper frame portion 28. In the bracket 24, a concave bead 24E that is recessed toward the upper frame portion 28 is formed along the sheet width direction at the vertical center portion in the range from the portion on the outer side in the sheet width direction of the center portion 24A to the side portion 24C. In the bracket 24, the range 24F from the portion where the concave bead 24E is formed to the upper side is curved so that the outer peripheral surface has a radius equal to or greater than a defined radius R. Also, in the bracket 24, the range 24G from the portion where the concave bead 24E is formed to the lower side is curved so that the outer peripheral surface has a radius equal to or greater than the defined radius R. The defined radius R is, for example, 5 mm. And the left - hand curved portion 24D of the bracket 24 is disposed in the upper side in proximity in the vertical direction to the upper edge of the semi - cylindrical portion 26D with respect to the left - hand side frame portion 26. And further, the left - hand side portion 28C of the upper frame portion 28 and the upper and lower edge portions of the left - hand curved portion 24D of the bracket 24 are joined via a fourth welding bead 30D and a fifth welding bead 30E. Note that the right - hand side portion 28C of the upper frame portion 28 and the right - hand curved portion 24D of the bracket 24 are joined in the same relationship as the left - hand side portion 28C of the upper frame portion 28 and the left - hand curved portion 24D of the bracket 24.

[0021] As shown in FIG. 4, in the present embodiment described above, a step portion 32 is formed between the upper end portion of the semi-cylindrical portion 26D of the side frame portion 26 and the side portion 28C of the upper frame portion 28. Further, a bracket 24 having a curved portion 24D that extends along the step portion 32 and whose outer peripheral surface is curved is joined to the upper frame portion 28. In the present embodiment, the spherical member 34 with a diameter of 165 mm is set to be separated from the step portion 32 in a state where it is in contact with the range 24G from the portion where the concave bead 24E is formed in the curved portion 24D of the bracket 24 to the lower side and the side frame portion 26. Thereby, it is possible to satisfy the regulation of protrusions in the vehicle interior that the spherical member 34 should not contact the step portion 32. For example, in the configuration of the present embodiment, it is possible to satisfy the regulation of protrusions in the vehicle interior while eliminating the need to provide a member such as felt that covers the step portion 32.

[0022] Note that in the present embodiment, in a state where the spherical member 34 is in contact with the range 24G from the portion where the concave bead 24E is formed in the curved portion 24D of the bracket 24 to the lower side and the range 24F to the upper side, an edge portion similar to the step portion 32 does not contact the spherical member 34. Further, even in a state where the spherical member 34 is in contact with the range 24F from the portion where the concave bead 24E is formed in the curved portion 24D of the bracket 24 to the upper side and the upper frame portion 28, an edge portion similar to the step portion 32 does not contact the spherical member 34.

[0023] Further, as shown in FIG. 2, in the present embodiment, the bracket 24 is joined to the pair of left and right side portions 28C of the upper frame portion 28 in a state of being spanned between the pair of left and right side portions 28C of the upper frame portion 28. In this configuration, compared with a configuration in which the bracket 24 is not spanned between the pair of left and right side portions 28C of the upper frame portion 28, the strength and rigidity of the portions of the back frame main body 22 corresponding to the pair of left and right side portions 28C of the upper frame portion 28 can be improved.

[0024] In this embodiment, an example has been described in which the bracket 24 is attached to the left and right side portions 28C of the upper frame portion 28 while being stretched between them, but the present invention is not limited to this. For example, a bracket configuration that does not contribute to the strength and rigidity of the back frame body 22 can also be used.

[0025] Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above, and can be implemented in various other ways without departing from the spirit of the invention. [Explanation of Symbols]

[0026] 14 Seatback 22 Back frame main body 24 brackets 24D curved section 26 Side frame section 28 Upper frame section 28C Side section 32 Step part 34 Spherical member

Claims

1. The back frame body, which constitutes the main part of the seat back frame that supports the back of the seated occupant from the rear side of the seat, has a pair of left and right side frame sections that are spaced apart in the width direction of the seat and extend in the vertical direction of the seat, and an upper frame section that is stretched between the upper ends of the pair of left and right side frame sections and joined in a state where it overlaps with the upper ends of the pair of left and right side frame sections. A bracket joined to the back frame body has a curved portion that extends along the stepped portion formed between the upper end of the side frame portion and the upper frame portion and curves, Equipped with, A vehicle seat in which a spherical member with a diameter of 165 mm is in contact with the curved portion and the back frame body, and the spherical member is set to be spaced apart from the stepped portion.

2. The upper frame portion comprises a pair of left and right side portions that extend toward the upper end of the left and right side frame portions toward the end of the seat, The vehicle seat according to claim 1, wherein the bracket is joined to the left and right side portions in a state where it is stretched between the left and right side portions.

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