seat back

Abstract

This invention provides a seat back that adequately ensures the thickness of the headrest cushion to enhance protection for the head or neck of the occupant. The seat back of this invention includes: a seat back frame (10) serving as the skeleton of the seat back; a headrest (30) supporting the head of the occupant; and a headrest post (40) attached to the upper part of the seat back frame and supporting the headrest, wherein the headrest post has: a fixing portion (41) fixed to the upper front surface of the seat back frame; and a first curved portion (42) extending rearward from the fixing portion.

Description

Technical Field

[0001] This invention relates to a seat back having a headrest supported by a headrest column. Background Technology

[0002] The upper part of the seat back of a vehicle seat is equipped with a headrest to protect the occupant's head or neck from impact injuries in the event of a rear-end collision. The headrest is generally fixed to the upper part of the seat back frame, which forms the skeleton of the seat back.

[0003] Conventionally, the following techniques have been used to fix the headrest to the seat back frame: the bracket of the headrest frame, which is the core material fixed to the headrest, is located on the front side of the seat back frame, and the upper horizontal part of the seat back frame is clamped from the front and back by the bracket and a plate provided on the rear side of the seat back frame and bolts are tightened to fix it (for example, Patent Document 1).

[0004] Moreover, there is a technique in which a headrest guide mounting frame is provided parallel to the upper frame of the seat back frame, and a pair of cylindrical headrest guide portions are fixedly connected across the upper frame and the headrest guide mounting frame, and the core material of the headrest, i.e. the headrest, is inserted into the headrest guide portion, thereby installing the headrest onto the upper part of the seat back frame (e.g., Patent Document 2).

[0005] [Existing technical documents]

[0006] [Patent Literature]

[0007] Patent Document 1: Japanese Patent Application Publication No. 04-109913

[0008] Patent Document 2: Japanese Patent Application Publication No. 2016-210319 Summary of the Invention

[0009] [The problem the invention aims to solve]

[0010] In the headrest invention of Patent Document 1 or the vehicle seat of Patent Document 2, the structure in which the headrest is located on the front side of the seat back frame cannot sufficiently ensure the thickness of the headrest's cushioning pad. Therefore, there is a requirement for more adequate strength to withstand the impact loads from a collision.

[0011] On the other hand, in order to increase the thickness of the headrest cushion, it is considered to fix the lower end of the headrest support column to the upper rear surface of the seat back frame by welding or the like. However, if the lower end of the headrest support column is fixed to the upper rear side of the seat back frame in this way, the torque caused by the force exerted on the headrest from the occupant's head during a collision will act in a way that peels off the welded part of the headrest support column. Therefore, it is necessary to further improve the joint rigidity of the headrest support column to the seat back frame.

[0012] This invention was made in response to the aforementioned problems, and aims to provide a seat back that can adequately ensure the thickness of the headrest cushion to improve the protection of the occupant's head or neck.

[0013] Another object of the present invention is to provide a seat back that can improve the installation rigidity of the headrest column to the seat back frame.

[0014] [Technical means to solve the problem]

[0015] To solve the aforementioned problem, the seat back of the invention described in the first technical solution includes:

[0016] The seat back frame serves as the skeleton of the seat back.

[0017] A headrest supports the head of the person sitting; and

[0018] The headrest pillar is attached to the upper part of the seat back frame and supports the headrest.

[0019] The seat back is characterized in that...

[0020] The headrest column has:

[0021] A fixing part, fixed to the upper front surface of the seat back frame; and

[0022] The first curved portion extends rearward from the fixed portion.

[0023] The invention described in the second technical solution is a seat back according to the first technical solution, characterized in that...

[0024] The seat back frame includes:

[0025] A pair of side frames, separated in the left-right direction; and

[0026] The upper frame spans across the upper ends of the pair of side frames, and its two ends are joined to the side frames.

[0027] The headrest post has its lower end fixed to the front surface of the upper frame, and has a second bend above the fixed portion to the upper frame, the second bend extending upward relative to a first extension extending from the first bend.

[0028] The invention described in the third technical solution is a seat back according to the second technical solution, characterized in that...

[0029] The second curved portion is positioned further forward than the rear end of the upper frame in the fore-and-aft direction of the seat.

[0030] The invention described in the fourth technical solution is a seat back according to the third technical solution, characterized in that,

[0031] The headrest post has a third bend between the upper end of the headrest post and the second bend, the third bend extending forward relative to a second extension extending from the second bend.

[0032] The invention described in the fifth technical solution is a seat back according to the fourth technical solution, characterized in that,

[0033] The third curved portion is positioned further rearward than the rear end of the upper frame in the fore-aft direction of the seat.

[0034] The invention described in the sixth technical solution is a seat back according to any one of the first to fifth technical solutions, characterized in that it includes:

[0035] Supporting member, supporting the headrest

[0036] In a position further rearward than the first bend in the fore-and-aft direction of the seat, the headrest is mounted to the upper end of the headrest post via the support member.

[0037] The invention described in the seventh technical solution is a seat back as described in the sixth technical solution, characterized in that,

[0038] The support member includes a plate portion that connects to the headrest and an extension portion that extends rearward from the plate portion.

[0039] The extension is fixed to the headrest post by being fixed to the upper end of the headrest post.

[0040] The extension is fixed to the upper end of the headrest column at at least three points.

[0041] The invention described in the eighth technical solution is a seat back as described in the seventh technical solution, characterized in that,

[0042] The headrest pillar has a pair of fourth bends at a position slightly higher than the third bend, the pair of fourth bends extending upwards toward the center of the seat back.

[0043] The invention described in the ninth technical solution is a seat back according to the eighth technical solution, characterized in that it has:

[0044] A pair of fifth bends bend in a manner that changes their direction to the horizontal at the portion sandwiched between the pair of fourth bends.

[0045] The extension is fixed to the upper end of the headrest post at a position that avoids the fifth bend.

[0046] The invention described in the tenth technical solution is a seat back as described in the ninth technical solution, characterized in that,

[0047] The lower end of the headrest is located further down than the third curved portion.

[0048] [The effects of the invention]

[0049] According to the invention described in the first technical solution, the thickness of the headrest's cushioning pad can be sufficiently ensured to improve the protection of the occupant's head or neck. Furthermore, the mounting rigidity of the headrest pillar to the seat back frame can be improved.

[0050] According to the invention described in the second technical solution, a headrest column can be formed in a reproducible manner to achieve the desired shape.

[0051] According to the invention described in the third technical solution, the amount of the headrest column protruding backward can be suppressed, which helps to make the headrest more compact in the front-back direction.

[0052] According to the invention described in the fourth technical solution, the upper part of the headrest column can be tilted forward to increase the resistance to forces acting from the front, making it difficult to cause plastic deformation.

[0053] According to the invention described in the fifth technical solution, the bending angle at the third curved portion of the headrest column can be increased.

[0054] According to the invention described in the sixth technical solution, the rigidity of the connection between the main body of the headrest and the upper part of the headrest column is improved. Furthermore, the thickness of the headrest's cushioning pad is sufficiently ensured, and by utilizing the flexibility of the headrest column itself, the function of protecting the head or neck of the sitter is enhanced.

[0055] According to the invention described in the seventh technical solution, the supporting member (headrest frame) can be easily attached to the headrest column.

[0056] According to the invention described in the eighth technical solution, a headrest column can be formed with good reproducibility to achieve the desired shape.

[0057] According to the invention described in the ninth technical solution, the support member of the headrest can be relatively easily fixed (welded) to the upper end of the headrest column.

[0058] According to the invention described in the tenth technical solution, a headrest body having a desired vertical length can be positioned at an appropriate height. Attached Figure Description

[0059] Figure 1 This is a perspective view showing a structural example of a component located in the upper part of the seat back of the present invention, which serves as the internal framework of the headrest.

[0060] Figure 2 This is a front view showing an example of the structure of the upper part of the seat back frame that constitutes the seat back of the present invention.

[0061] Figure 3 It indicates viewing from the side. Figure 1 The side view shows the structural state of the components that form the internal framework of the headrest.

[0062] Figure 4 This is an exploded perspective view of the headrest of the seat back as constituting the embodiment.

[0063] Figure 5 It is a three-dimensional diagram showing the connection between the headrest pillar and the bracket that makes up the headrest.

[0064] Figure 6 This is a cross-sectional side view showing the internal structure of the headrest in the embodiment.

[0065] Explanation of icon numbers

[0066] 10: Seat back frame

[0067] 11A, 11B: Side frames

[0068] 12: Upper frame (top frame)

[0069] 12a, 323a, 324a, 328a: Opening

[0070] 21: Blower

[0071] 30: Headrest

[0072] 31: Headrest Frame

[0073] 31a: Bolt insertion hole

[0074] 31b: Opening

[0075] 32: Headrest body

[0076] 33: Decorative Cover

[0077] 33a: Mounting plate

[0078] 33b: Screw

[0079] 40: Headrest Pillow

[0080] 40a, 40b: Feet

[0081] 40c: Bridge section

[0082] 41: Fixing part

[0083] 42: First bending point

[0084] 43: Second bending point

[0085] 44: Upper horizontal section

[0086] 45: Third bending point

[0087] 46: Fourth bending point

[0088] 47: Fifth bending point

[0089] 121: Base section

[0090] 122: Emphasize the face

[0091] 123: Horizontal section

[0092] 124: Label

[0093] 311: Plate section

[0094] 312: Extension

[0095] 321: Bracket

[0096] 321a: Flange portion

[0097] 322: Compression member

[0098] 322a: Step difference part

[0099] 322b: small hole

[0100] 323: Rear inner shell

[0101] 323b, 324b: Screw insertion holes

[0102] 324: Front inner shell

[0103] 325: Padding

[0104] 326: Board material

[0105] 327: Front Cover

[0106] 328: Back Cover

[0107] 328b: Locking clip

[0108] 329: Pressing the steel wire

[0109] θ1, θ2, θ3: Bending angles Detailed Implementation

[0110] Hereinafter, embodiments of the seat back and vehicle seat of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view showing an example of the structure and installation structure of a component located in the upper part of the seat back that serves as the internal framework of the headrest. Figure 2 It indicates composition Figure 1 The diagram shows a front view of an example of the structure of the upper part of the seat back frame. Figure 3 It indicates viewing from the side. Figure 1 The diagram shown is a side view of the structure of the components that form the internal framework of the headrest. Figure 4 This is an exploded 3D diagram of the headrest. Additionally, in the following explanation, unless otherwise specified, the direction of vehicle travel will be referred to as the front, and the opposite direction as the rear.

[0111] like Figure 1 As shown, the headrest body 32 located at the upper part of the seat back in this embodiment is configured to be attached to the front surface of the upper part of the headrest pillar 40, which is inverted U-shaped when viewed from the front, and is supported by the seat back frame 10 via the headrest pillar 40. The lower end of the headrest pillar 40 is fixed to the front surface of the upper part of the seat back frame 10, which serves as the skeleton of the seat back, by means of welding or the like.

[0112] Specifically, the headrest has a bottom frame 31 protruding from the back towards the rear and a headrest body 32 mounted on the bottom frame 31. The rear end of the bottom frame 31 is fixed to the upper part of the headrest post 40 by welding or the like. As will be described in detail later, the headrest body 32 has shock-absorbing components that serve as padding or a cover.

[0113] The headrest pillar 40 is curved in a rearward bulge manner, and the lower ends of the legs 40a and 40b are fixed to the front surface of the protruding face 122 of the upper frame 12 that constitutes the seat back frame 10 by welding. By providing the upper frame 12 with the protruding face 122 to fix the lower ends of the legs 40a and 40b of the headrest pillar 40, the welding range can be widened, and the joint rigidity of the headrest pillar 40 can be improved.

[0114] On the other hand, the seat back frame 11 includes: a pair of left and right side frames 11A and 11B; an upper frame 12, which is arranged in the width direction across the upper ends of the side frames 11A and 11B; and a seat back frame 10, which is formed in a generally inverted U-shape when viewed from the front-rear direction of the seat. The upper frame 12 is joined to the side frames 11A and 11B by welding, thereby being set to a rigid joint state.

[0115] Furthermore, although not shown in the figure, a bottom frame is rigidly connected and spans the lower ends of the side frames 11A and 11B. Additionally, a cushioning pad or a bottom frame supporting the cushioning pad is provided on the front surface of the seat back frame 10, made of foamed rubber or foamed urethane, and the surface of the cushioning pad is covered with a skin.

[0116] In the case where the seat back including the headrest in this embodiment is used in a vehicle seat, the lower end of the seat back frame 10 is hinged to the rear end of the seat cushion frame, which serves as the skeleton of the seat cushion, in a tiltable manner.

[0117] In addition, the side frames 11A and 11B, which serve as the skeleton of the seat back, may include inner side frames and outer side frames, or they may include tubing or a bottom frame.

[0118] The upper frame 12 has a lower base portion 121 and a protruding portion 122 that protrudes forward beyond the base portion 121, and is provided with an opening 12a for inserting the blower 21. Additionally, as... Figure 2 As shown, a horizontal plate 123 is provided between the base portion 121 and the protruding surface 122. This horizontal plate 123 also has an opening, whereby the opening 12a extends from the base portion 121 to the protruding surface 122 in an L-shape in side view. Thus, the protruding surface 122 has a shape that protrudes further forward than the base portion 121, and the opening 12a is formed from the base portion 121 to the protruding surface 122, thereby forming a storage recess for accommodating the blower 21. Furthermore, Figure 2 In the figure, reference numeral 124 refers to the joint and fixed parts of the two sides of the upper frame 12 with the upper ends of the side frames 11A and 11B.

[0119] Next, the detailed structure and support structure of the headrest 30 in this embodiment will be described. Figure 3 Indicates viewing from the side Figure 1 The structure of the component that serves as the internal skeleton of the headrest 30 (excluding the component that serves as the cushioning pad) and the state of the support structure including the headrest pillar 40 that supports this component are shown.

[0120] As described above, in this embodiment, the headrest pillar 40 is bent in a rearward bulge manner, and the lower ends of the feet 40a and 40b are fixed to the front surface of the protruding face 122 of the upper frame 12 by welding.

[0121] Therefore, the lower ends of the foot portions 40a and 40b become fixing portions 41 for fixing the headrest pillar 40 to the upper front surface of the seat back frame 10. In this way, the fixing portion 41 is fixed to the upper front surface of the seat back frame 10, so that in the event of a rear-end collision, even if the impact from the occupant's head acts on the headrest pillar 40, the force will not act in a way that peels off the welded portion of the fixing portion 41. Therefore, the headrest pillar 40 can be fixed to the seat back frame 10 more securely than when the fixing portion 41 is fixed to the upper rear surface of the seat back frame 10.

[0122] Furthermore, the headrest pillar 40 of this embodiment is formed such that the left and right pairs of foot portions 40a and 40b each have: a first curved portion 42 extending rearward from the upper part of the fixing portion 41; a second curved portion 43 extending upward above the rear end of the upper frame 12 in a manner relative to the straight line connecting the fixing portion 41 and the first curved portion 42; and a third curved portion 45 extending forward between the upper horizontal portion 44 of the headrest pillar 40 and the second curved portion 43 in a manner relative to the straight line connecting the first curved portion 42 and the second curved portion 43.

[0123] Alternatively, the headrest column 40 can be formed by bending a steel rod or steel tube. The headrest frame 31 is attached to the upper horizontal portion 44 of the headrest column 40. The bending angle θ1 at the first bending portion 42 can be less than 90 degrees.

[0124] Thus, the headrest post 40 bends at three bends, thereby mounting the headrest 30 further back onto the headrest post 40 than the upper front surface of the seat back frame 10.

[0125] This ensures sufficient thickness of the cushioning pad in the headrest body 32, thereby significantly improving its ability to protect the occupant's head or neck from impact injuries. Furthermore, the headrest column 40 has a shape where, when viewed from the side, the central portion bulges backward and the part above the third bend 45 tilts forward, thus increasing its resistance to forces acting from the front of the headrest column 40 and making it less prone to plastic deformation.

[0126] Furthermore, by providing multiple curved sections in the headrest column 40, the headrest column can be bent with good reproducibility compared to the case where it is formed by bending the entire column.

[0127] Here, if we define the rearward bending angle of the first curved portion 42 as θ1, the upward bending angle of the second curved portion 43 as θ2, and the forward bending angle of the third curved portion 45 as θ3, then the condition for forming a shape with the portion higher than the third curved portion 45 leaning forward is θ1 < (θ2 + θ3). Furthermore, if we set the bending angle of each curved portion to θ1 = (θ2 + θ3), then the portion higher than the third curved portion 45 will be parallel to the fixed portion 41 when viewed from the side.

[0128] Furthermore, when a rearward force acts from the headrest 30 on the upper end of the headrest pillar 40, the bending moment generated in the second bend 43 will become greater than the bending moment generated in the third bend 45. Therefore, it is considered to set the bending angles at the second and third bends to θ2 > θ3.

[0129] Furthermore, in this embodiment, the headrest pillar 40 is formed as a bridge portion 40c (refer to...). Figure 1 It has: a pair of fourth curved portions 46 (refer to) Figure 5 The headrest post 40 extends upwards towards the center of the seat back, slightly higher than the third bend 45; and a pair of fifth bends 47 bend horizontally at the point sandwiched between a pair of fourth bends 46. In this specification, the area between the left and right pairs of fourth bends 46 in the headrest post 40 is referred to as the transition section, and the area from the fourth bends 46 to the fixing section 41 is referred to as the foot section.

[0130] Moreover, such as Figure 5 As shown, the headrest frame 31, which is attached to the upper horizontal portion 44 of the headrest post 40, has: a trapezoidal plate portion 311 arranged along a generally vertical direction; and a roof-shaped extension portion 312 extending rearward from the upper edge and the left and right inclined edges of the plate portion 311a, and the rear end is fixed to the headrest post 40 by welding. By providing the extension portion 312 in this way, the headrest frame 31, which serves as a support member of the headrest body portion 32, can be easily attached to the headrest post 40.

[0131] Here, in the plate portion 311, a pair of bolt insertion holes 31a are formed for bolts to be inserted for fixing the bracket 32A described later. In the extension portion 312, two openings 31b are formed for weight reduction.

[0132] Furthermore, the headrest frame 31 is fixed to the circumference of the upper horizontal portion 44 of the headrest pillar 40 by welding at the front end (rear end) of the three wall portions of the extension 312 that sandwich the two openings 31b.

[0133] In this way, the headrest frame 31 is fixed to the upper part of the headrest column 40 by welding at three points. Therefore, it can maintain the required joint rigidity while reducing the welding range, thereby improving workability. Moreover, if welding is simply performed at three points without providing two openings 31b, deviations at the welding points are likely to occur between products. However, by providing two openings 31b to limit the welding points, product deviations can be reduced.

[0134] Furthermore, the headrest frame 31, which serves as a support member for the headrest body 32, is mounted on the headrest pillar 40 with the support plate portion 311 positioned further forward than the upper end of the headrest pillar 40 relative to the front-back direction of the seat. Therefore, the force acting on the headrest from the occupant's head can be efficiently and effectively transmitted to the headrest pillar 40 for absorption.

[0135] On the other hand, such as Figure 4As shown, the headrest body 32 includes: a U-shaped headrest mounting bracket 321, fixed to the front surface of the plate portion 311 of the headrest frame 31 by bolts / nuts; and a pressure-bearing member 322 made of rigid material, disposed in contact with the front surface of the bracket 321, which absorbs the impact load from the occupant's head during a rear-end collision and transmits it directly to the headrest frame 31 via the bracket 321. Furthermore, the bracket 321 has flanges 321a formed at the front ends of its left and right sidewall portions. Moreover, the pressure-bearing member 322 has a stepped portion 322a on its front surface, the central portion of which is one step higher than the flange portion, and a plurality of small holes 322b are formed in this stepped portion.

[0136] Furthermore, the headrest body 32 includes: a rear inner shell 323 made of synthetic resin, with an opening 323a of a size that can be fitted into the body of the bracket 321; and a front inner shell 324 also made of synthetic resin, with an opening 324a of a size that can be fitted into the front surface stepped portion 322a of the pressure member 322.

[0137] These rear inner shells 323 and front inner shells 324 are formed in a shape that is larger than the pressure member 322 when viewed from the front. Multiple screw insertion holes 323b and 324b are formed along the periphery. They can be assembled by inserting bolts into these screw insertion holes 323b and 324b and screwing nuts in.

[0138] Therefore, when fixing the bracket 321 to the headrest frame 31, it is fixed in a state where it fits into the opening 323a of the rear inner housing 323, and the stepped portion of the front surface of the pressure-bearing member 322 fits into the opening 324a of the front inner housing 324, and after it is joined to the front surface of the rear inner housing 323, the front inner housing 324 and the rear inner housing 323 are integrated using bolts / nuts. Thus, the edge of the opening 323a of the rear inner housing 323 contacts the rear surface of the left and right flanges 321a of the bracket 321, and the rear surface of the pressure-bearing member 322 contacts the front surface of the flanges 321a.

[0139] Therefore, it is possible to clamp the pressure-bearing member 322 from the front and rear using the front inner shell 324 and the rear inner shell 323, and then... Figure 3 As shown, it is fixed to the headrest frame 31 via bracket 321. Furthermore, the rear inner shell 323 and the front inner shell 324 function as protective members covering the outer edge of the pressure-bearing member 322.

[0140] Furthermore, in the headrest body 32 of this embodiment, a cushion 325 with shock-absorbing properties, such as foamed rubber or foamed urethane, is provided on the front surface of the front inner shell 324. Additionally, a sheet material (urethane sheet) 326, containing a material softer than the cushion 325 to improve the tactile feel when the occupant's head touches the headrest, is provided on its front surface. The front surface of the sheet material 326 is covered by a front cover 327 formed of a stretchable material. The cushion 325 is formed in a shape that is slightly larger than the front inner shell 324 when viewed from the front. Furthermore, shallow recesses are formed on the front surface of the cushion 325 for accommodating the sheet material 326 to prevent the sheet material 326 from shifting (deviating).

[0141] By forming multiple small holes 322a in the stepped portion of the pressure member 322, when the occupant's head hits the headrest during a rear-end collision and the plate 326 and padding 325 are compressed and deformed, the internal air can escape rearward through the small holes 322a of the pressure member 322, thereby reducing the impact on the head.

[0142] Furthermore, in the headrest body 32, a bowl-shaped rear cover 328, recessed rearward, is provided on the rear side of the rear inner shell 323. The rear cover 328 has an opening 328a with a shape corresponding to the headrest frame 31, and at each of the four corners inside the bowl, a locking piece 328b protruding forward and having a claw at its front end is provided. Although in Figure 4 Not shown in the diagram, but a locking hole is formed on the rear inner housing 323 at the location corresponding to the locking piece 328b. The claw at the front end of the locking piece 328b engages with the locking hole of the rear inner housing 323, thereby locking the rear cover 328 to the rear side of the rear inner housing 323 (see reference). Figure 6 ).

[0143] Figure 6 This is a cross-sectional side view showing the state in which the various parts constituting the headrest body 32 of this embodiment are assembled to the headrest frame 31.

[0144] like Figure 6 As shown, in the headrest body 32 of this embodiment, the pad 325 is installed on the front surface side of the front inner shell 324 to cover the front surface and edge of the front inner shell 324, and the front cover 327 is fitted on the front surface and edge of the pad 325. Furthermore, a pressing wire 329 made of an elastic material such as a spring is provided between the lower end of the rear inner shell 323 and the front inner shell 324.

[0145] like Figure 4As shown, the pressing wire 329 is bent into a semi-rectangular shape in the center, with the shaft portions at both ends inserted into a locking portion (not shown) provided on the front inner housing 324. Furthermore, as... Figure 6 The configuration shown is such that the hook-shaped portion of the pressing wire 329 is arranged in a forward-facing and downward-sloping manner, with its front end engaging with the lower edge of the front inner housing 324 from the rear. Therefore, the lower edge of the front inner housing 324 is compressed and deformed by being pressed forward, so that the thickness of the portion slightly inward from the lower edge of the pad 325 covering the front becomes less than that of the edge. Thus, the edge of the pad 325 is less likely to deviate from the front inner housing 324.

[0146] Furthermore, in the headrest of this embodiment, such as Figure 6 As shown, a decorative cover 33 for covering the rear part of the headrest frame 31 and the upper part of the headrest pillar 40 transition portion 40c is disposed on the rear side of the rear inner housing 328.

[0147] Specifically, an L-shaped mounting metal piece 33a is provided on the upper part of the decorative cover 33, protruding forward. The mounting metal piece 33a is fixed to the upper surface of the headrest frame 31 by screws 33b, thereby the decorative cover 33 is installed on the upper part of the headrest pillar 40.

[0148] By setting up the decorative cover 33 in this way, the headrest frame 31 or bracket 321 can be avoided from being seen directly from the rear, thereby improving the appearance of the seat back.

[0149] The present invention has been described above as one embodiment, but the present invention is not limited to this embodiment and can be implemented with various modifications without departing from its spirit. For example, in this embodiment, the bracket 321 for fixing the headrest body 32 to the headrest frame 31 is arranged in a U-shape in plan view, but the bracket 321 may also be arranged in a U-shape in side view. Moreover, the bracket 321 may be formed as a box shape with one open side instead of a U-shape, and flanges may be provided at the four edges of the opening.

[0150] Furthermore, in this embodiment, the headrest pillar 40 is formed with two legs 40a and 40b and a bridge portion 40c provided between the upper parts of the legs 40a and 40b, but it may also include only one pillar arranged in the vertical direction. However, by providing a structure with two legs 40a and 40b as in this embodiment, the strength in the torsional direction can be improved compared to the case of one pillar. Moreover, the case where the bottom frame 31 is fixed to the headrest pillar 40 by welding or the like has been described, but it may also be configured such that a flange is provided on the headrest pillar 40 and it is attached to the flange by bolts / nuts. In this case, the bracket 321 can be omitted.

[0151] Furthermore, this embodiment describes the case where the fixing part 41 of the headrest pillar 40 is fixed to the front surface of the upper frame 12 by welding. However, instead of welding, Ω-shaped fixing metal parts (saddle bands) and bolts / nuts can also be used for fixing. Moreover, for example, the fixing part 41 of the headrest pillar 40 can be set as a double tube structure, thereby constituting an adjustable headrest height.

[0152] Furthermore, in this embodiment, the seat back of the present invention is used as an example to illustrate its application to vehicle seats, but the present invention is not limited to vehicle seats, and can also be applied to seats for transportation vehicles such as ships or airplanes, or to seats (sofas) used as furniture.

Claims

1. A seat back, comprising: The seat back frame serves as the skeleton of the seat back. A headrest supports the head of the person sitting down; as well as The headrest pillar is attached to the upper part of the seat back frame and supports the headrest. The seat back is characterized in that... The headrest column has: A fixing part, fixed to the upper front surface of the seat back frame; and The first curved portion extends rearward from the fixed portion.

2. The seat back according to claim 1, characterized in that, The seat back frame includes: A pair of side frames, separated in the left-right direction; and The upper frame spans across the upper ends of the pair of side frames, and its two ends are joined to the side frames. The headrest post has its lower end fixed to the front surface of the upper frame, and has a second bend above the fixed portion to the upper frame, the second bend extending upward relative to a first extension extending from the first bend.

3. The seat back according to claim 2, characterized in that, The second curved portion is positioned further forward than the rear end of the upper frame in the fore-and-aft direction of the seat.

4. The seat back according to claim 3, characterized in that, The headrest post has a third bend between the upper end of the headrest post and the second bend, the third bend extending forward relative to a second extension extending from the second bend.

5. The seat back according to claim 4, characterized in that, The third curved portion is positioned further rearward than the rear end of the upper frame in the fore-aft direction of the seat.

6. The seat back according to claim 4 or 5, characterized in that, include: Supporting member, supporting the headrest In a position further rearward than the first bend in the fore-and-aft direction of the seat, the headrest is mounted to the upper end of the headrest post via the support member.

7. The seat back according to claim 6, characterized in that, The support member includes a plate portion that connects to the headrest and an extension portion that extends rearward from the plate portion. The extension is fixed to the headrest post by being fixed to the upper end of the headrest post. The extension is fixed to the upper end of the headrest column at at least three points.

8. The seat back according to claim 7, characterized in that, The headrest pillar has a pair of fourth bends at a position slightly higher than the third bend, the pair of fourth bends extending upwards toward the center of the seat back.

9. The seat back according to claim 8, characterized in that, have: A pair of fifth bends bend in a manner that changes their direction to the horizontal at the portion sandwiched between the pair of fourth bends. The extension is fixed to the upper end of the headrest post at a position that avoids the fifth bend.

10. The seat back according to claim 9, characterized in that, The lower end of the headrest is located further down than the third curved portion.

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