seat backrest

Abstract

This application relates to a seat backrest. The seat backrest includes: a seat backrest frame; a first seat belt guide having a first end and a second end, the first end and the second end being supported on the seat backrest frame at positions spaced apart from each other in the width direction of the seat backrest frame, and guiding a seat belt withdrawn from a seat belt retractor; and a support member supporting the intermediate portion of the first seat belt guide between the first end and the second end from below.

Description

Technical Field

[0001] This invention relates to a seat back. Background Technology

[0002] JP2024-83194A discloses a seat back frame for a vehicle seat. The seat back frame forms the skeleton of the seat back, which serves as a backrest, and is covered by a padding member and an outer layer member made of cushioning material. The seat back frame includes a tubular frame, a back panel frame, a support bracket for a seatbelt retractor, a mounting bracket for a locking device, a first seatbelt guide, and a second seatbelt guide for guiding the seatbelt as it is withdrawn from the seatbelt retractor. The tubular frame includes a first tubular member having a left frame portion, a right frame portion, and an upper frame portion, and the first and second seatbelt guides are mounted to the upper frame portion of the first tubular member. Each of the first and second seatbelt guides is formed by a line that is generally U-shaped, and a pair of arms formed from the two ends of each line are curved and joined to the peripheral surface of the upper frame portion by welding.

[0003] In the seat back frame of JP2024-83194A, each of the first seat belt guide and the second seat belt guide engages with the peripheral surface of the upper frame portion only at the arcuate portion of a pair of arms, and it is desirable to improve the support stiffness of the seat belt guide. Summary of the Invention

[0004] In view of the foregoing background technology, the object of the present invention is to provide a seat backrest in which the support stiffness of the seat belt guide is improved.

[0005] To achieve the above objectives, one aspect of the present invention provides a seat back 5 comprising: a seat back frame 12R; a first seat belt guide 51 having a first end 51a and a second end 51b supported on the seat back frame at positions spaced apart from each other along the width direction of the seat back frame, and guiding a seat belt 41 drawn from a seat belt retractor 42; and a support member 53 supporting from below an intermediate portion 51d of the first seat belt guide between the first end and the second end.

[0006] According to this aspect, since the middle portion of the first seatbelt guide is supported from below by a support member, the support stiffness of the first seatbelt guide is increased. Therefore, a seat back with increased support stiffness of the first seatbelt guide can be provided.

[0007] In the above respects, the support member may have a first fixing part 53a and a second fixing part 53b, which are fixed to the seat back frame at positions spaced apart from each other along the width direction. The first fixing part is disposed further outward in the width direction than the first end of the first seat belt guide, and the second fixing part is disposed further outward in the width direction than the second end of the first seat belt guide relative to the middle portion.

[0008] According to this aspect, since the support stiffness of the support member is improved, the support stiffness of the first seat belt guide supported by the support member is also improved.

[0009] In the above respects, the support member may include: a line member 54, which includes a first line portion 54a and a second line portion 54b extending at least in the vertical direction and a connecting line portion 54d extending at least in the width direction and connecting the first line portion and the second line portion; and a connecting bracket 55, which connects the first line portion and the second line portion.

[0010] Here, "extending at least in the vertical direction" means that the extension direction of each line part has a vertical component, but the extension direction of each line part is not limited to the vertical direction. Furthermore, "extending at least in the width direction" means that the extension direction of the connecting line part has a component in the width direction, but the extension direction of the connecting line part is not limited to the width direction. According to this aspect, the weight of the supporting member can be reduced by using line members, and the stiffness of the supporting member can be increased by using connecting brackets.

[0011] In the aforementioned respect, the connecting bracket can be connected to the first seat belt guide.

[0012] Based on this, the support stiffness of the first seat belt guide was further improved.

[0013] In the aforementioned respect, the connecting bracket may include a fixing part 55b for fixing the outer cover 8, 11 of the seat back.

[0014] In this respect, in addition to serving as a reinforcing member for support, the connecting bracket also functions as a fixing member for securing the decorative elements. Therefore, it is unnecessary to separately install fixing members for the decorative elements, and the increase in the number of components can be prevented.

[0015] In the aforementioned respect, the seat back frame can be configured to serve both the center seat 2C and the side seat 2R, the center seat 2C being the seat to which the seat belt is to be fastened, and for the center seat 2C, a first seat belt guide is positioned offset from the center of the seat along the width direction, and the side seat 2R is positioned on the side to which the first seat belt guide of the center seat is offset, the seat back frame may include a headrest support 36 supporting the headrest 7R of the side seat, and a connecting bracket may be connected to the headrest support.

[0016] According to this aspect, since the first seat belt guide is connected to the headrest support via a connecting bracket, the support stiffness of the first seat belt guide is further improved.

[0017] In the above respect, the lower end of the first fixing part and the lower end of the second fixing part of the support member are positioned below the upper end of the seat belt retractor.

[0018] Accordingly, the seat belt retractor is positioned at a high point where it overlaps with the support member along the height direction. This allows for a more compact seat back design.

[0019] In the aforementioned respect, the first seat belt guide may be made of wire, and the first end and the second end of the first seat belt guide may be bent to extend along the seat back frame in the width direction.

[0020] According to this aspect, even if the first seatbelt guide is made of wire, it can be fixed to a seat back frame extending a predetermined length in the width direction at both the first and second ends. Therefore, the support stiffness of the first seatbelt guide can be improved.

[0021] In the above respects, the seat back may further include a second seat belt guide 52 having a first end 52a and a second end 52b supported on the seat back frame at positions spaced apart from each other along the width direction, and guiding the seat belt at a position closer to the seat belt retractor than the first seat belt guide, wherein the first end and the second end of the second seat belt guide are positioned adjacent to the first end and the second end of the first seat belt guide and positioned behind the first end and the second end of the first seat belt guide.

[0022] According to this aspect, the force transmitted from the seat belt to the first seat belt guide is reduced due to the provision of the second seat belt guide. Therefore, when a large load is applied to the seat belt, such as in a frontal collision, deformation and breakage of the first seat belt guide can be suppressed. Furthermore, since the first and second ends of the second seat belt guide are arranged adjacent to the first and second ends of the first seat belt guide, the support stiffness of both seat belt guides can be improved.

[0023] In the aforementioned respect, the seat back frame may include: a panel structure 17R consisting of a front panel 23 and a rear panel 24 joined together; a pair of pivotal connections 18 disposed on the lower portion of corresponding side portions of the panel structure in the width direction and pivotally supported; and a reinforcing member 31 attached to the panel structure to extend in the width direction from near the pivotal connections on one side portion of the panel structure to the upper portion of the other side portion of the panel structure, wherein the supporting member engages with the reinforcing member.

[0024] According to this aspect, since the support member is joined to the reinforcing member with high rigidity, the support rigidity of the support member and the first seat belt guide is improved.

[0025] Invention Effects

[0026] One aspect of the invention provides a seat back 5 comprising: a seat back frame 12R; a first seat belt guide 51 having a first end 51a and a second end 51b supported on the seat back frame at positions spaced apart from each other along the width direction of the seat back frame, and guiding a seat belt 41 drawn from a seat belt retractor 42; and a support member 53 supporting from below an intermediate portion 51d of the first seat belt guide between the first end and the second end.

[0027] According to this aspect, since the middle portion of the first seatbelt guide is supported from below by a support member, the support stiffness of the first seatbelt guide is increased. Therefore, a seat back with increased support stiffness of the first seatbelt guide can be provided.

[0028] In the above respects, the support member may have a first fixing part 53a and a second fixing part 53b, which are fixed to the seat back frame at positions spaced apart from each other along the width direction. The first fixing part is disposed further outward in the width direction than the first end of the first seat belt guide, and the second fixing part is disposed further outward in the width direction than the second end of the first seat belt guide relative to the middle portion.

[0029] According to this aspect, since the support stiffness of the support member is improved, the support stiffness of the first seat belt guide supported by the support member is also improved.

[0030] In the above respects, the support member may include: a line member 54, which includes a first line portion 54a and a second line portion 54b extending at least in the vertical direction and a connecting line portion 54d extending at least in the width direction and connecting the first line portion and the second line portion; and a connecting bracket 55, which connects the first line portion and the second line portion.

[0031] Here, "extending at least in the vertical direction" means that the extension direction of each line part has a vertical component, but the extension direction of each line part is not limited to the vertical direction. Furthermore, "extending at least in the width direction" means that the extension direction of the connecting line part has a component in the width direction, but the extension direction of the connecting line part is not limited to the width direction. According to this aspect, the weight of the supporting member can be reduced by using line members, and the stiffness of the supporting member can be increased by using connecting brackets.

[0032] In the aforementioned respect, the connecting bracket can be connected to the first seat belt guide.

[0033] Based on this, the support stiffness of the first seat belt guide was further improved.

[0034] In the aforementioned respect, the connecting bracket may include a fixing part 55b for fixing the outer cover 8, 11 of the seat back.

[0035] In this respect, in addition to serving as a reinforcing member for support, the connecting bracket also functions as a fixing member for securing the decorative elements. Therefore, it is unnecessary to separately install fixing members for the decorative elements, and the increase in the number of components can be prevented.

[0036] In the aforementioned respect, the seat back frame can be configured to serve both the center seat 2C and the side seat 2R, the center seat 2C being the seat to which the seat belt is to be fastened, and for the center seat 2C, a first seat belt guide is positioned offset from the center of the seat along the width direction, and the side seat 2R is positioned on the side to which the first seat belt guide of the center seat is offset, the seat back frame may include a headrest support 36 supporting the headrest 7R of the side seat, and a connecting bracket may be connected to the headrest support.

[0037] According to this aspect, since the first seat belt guide is connected to the headrest support via a connecting bracket, the support stiffness of the first seat belt guide is further improved.

[0038] In the above respect, the lower end of the first fixing part and the lower end of the second fixing part of the support member are positioned below the upper end of the seat belt retractor.

[0039] Accordingly, the seat belt retractor is positioned at a high point where it overlaps with the support member along the height direction. This allows for a more compact seat back design.

[0040] In the aforementioned respect, the first seat belt guide may be made of wire, and the first end and the second end of the first seat belt guide may be bent to extend along the seat back frame in the width direction.

[0041] According to this aspect, even if the first seatbelt guide is made of wire, it can be fixed to a seat back frame extending a predetermined length in the width direction at both the first and second ends. Therefore, the support stiffness of the first seatbelt guide can be improved.

[0042] In the above respects, the seat back may further include a second seat belt guide 52 having a first end 52a and a second end 52b supported on the seat back frame at positions spaced apart from each other along the width direction, and guiding the seat belt at a position closer to the seat belt retractor than the first seat belt guide, wherein the first end and the second end of the second seat belt guide are positioned adjacent to the first end and the second end of the first seat belt guide and positioned behind the first end and the second end of the first seat belt guide.

[0043] According to this aspect, the force transmitted from the seat belt to the first seat belt guide is reduced due to the provision of the second seat belt guide. Therefore, when a large load is applied to the seat belt, such as in a frontal collision, deformation and breakage of the first seat belt guide can be suppressed. Furthermore, since the first and second ends of the second seat belt guide are arranged adjacent to the first and second ends of the first seat belt guide, the support stiffness of both seat belt guides can be improved.

[0044] In the aforementioned respect, the seat back frame may include: a panel structure 17R consisting of a front panel 23 and a rear panel 24 joined together; a pair of pivotal connections 18 disposed on the lower portion of corresponding side portions of the panel structure in the width direction and pivotally supported; and a reinforcing member 31 attached to the panel structure to extend in the width direction from near the pivotal connections on one side portion of the panel structure to the upper portion of the other side portion of the panel structure, wherein the supporting member engages with the reinforcing member.

[0045] According to this aspect, since the support member is joined to the reinforcing member with high rigidity, the support rigidity of the support member and the first seat belt guide is improved. Attached Figure Description

[0046] Figure 1 It is a perspective view of a vehicle seat according to the implementation method;

[0047] Figure 2 It is a perspective view of a vehicle seat showing the seat back frame;

[0048] Figure 3 This is a schematic exploded view of the right panel structure of the right seat back;

[0049] Figure 4 It is a 3D diagram of the right panel structure of the right seat back;

[0050] Figure 5 This is a front view of the upper part of the seat back frame of the right seat back.

[0051] Figure 6 This is a three-dimensional view of the main part of the right seat back, viewed from the front.

[0052] Figure 7 This is a picture of the right seat back as viewed from the rear;

[0053] Figure 8 This is a three-dimensional view of the upper part of the right seat back, viewed from above and behind.

[0054] Figure 9 It is along Figure 5 The cross-sectional view of the right seat back taken by line IX-IX in the diagram. Detailed Implementation

[0055] In the following description, an embodiment of the invention applied to an automobile seat 1, which is an example of a vehicle seat, will be described with reference to the accompanying drawings.

[0056] In this embodiment, the car seat 1 is a three-seat rear seat installed in the second row of a car. Hereinafter, based on the direction of travel of the car, the three seats 2 (2R, 2C, 2L) of the car seat 1 will be referred to as the right seat 2R, the center seat 2C, and the left seat 2L. The center seat 2C is located at the center in the width direction of the car, and the right seat 2R and left seat 2L are side seats located on either side of the center seat 2C. When they are collectively referred to or when they are not distinguished from each other, they can be simply referred to as seat 2.

[0057] Figure 1 This is a perspective view of the car seat 1 according to the embodiment. (See attached image.) Figure 1 As shown, the car seat 1 includes a seat cushion 4 and a seat back 5. The seat cushion 4 is supported on the car body (hereinafter referred to as the body 3) to support the occupant's buttocks from below, and the seat back 5 is used to support the occupant's back from the rear. The seat cushion 4 is a component manufactured for all three seats 2, and includes a right cushion portion 4R for the right seat 2R, a center cushion portion 4C for the center seat 2C, and a left cushion portion 4L for the left seat 2L. The seat cushion 4 is fixed to the floor, which is part of the body 3.

[0058] The seat backrest 5 is a two-piece type divided between the left and right sides, such that the ratio of the right portion to the left portion is 6 / 4, and includes a right seat backrest 5R and a left seat backrest 5L. The right seat backrest 5R integrally includes a right seat backrest for the right seat 2R and a center seat backrest 5C for the center seat 2C. That is, the right seat backrest 5R is configured to serve both the right seat 2R and the center seat 2C. The left seat backrest 5L is configured as a left seat backrest for the left seat 2L. The right seat backrest 5R and the left seat backrest 5L are pivotally supported.

[0059] The right seat backrest 5R and the left seat backrest 5L are configured as follows: Figure 1 The seat pivots between a standing position for seating and a folded position that pivots forward from the standing position. In the standing position, the upper portions of the right seatback 5R and left seatback 5L are fixed to the vehicle body 3, preventing them from pivoting forward. When the right seatback 5R and left seatback 5L are in the folded position, the space above them can be used as a cargo hold extension, which extends the cargo hold located behind the seat 2 forward.

[0060] In the front portion of the center seat backrest 5C of the right seat backrest 5R, an armrest 6 is disposed therein with a recessed receiving portion formed rearwardly. The armrest 6 is disposed in the receiving recess and supported on the right seat backrest 5R at its lower portion, allowing it to pivot about a laterally extending axis of rotation. The armrest 6 includes a base end supported on the seat backrest 5 and an end portion away from the base end, and is configured in a receiving position ( Figure 1 (location in the middle) and usage location (see Figure 2 The armrests pivot between the two sides. In the receiving position, the end portion is positioned in the upper part of the receiving recess; in the use position, the end portion is positioned in front of the base end. The armrests 6 essentially form the entire front surface of the center seat backrest 5C.

[0061] The upper part of the right seat backrest 5R is provided with a right headrest 7R for the right seat 2R and a center headrest 7C for the center seat 2C, allowing their vertical positions to be changed. The upper part of the left seat backrest 5L is provided with a left headrest 7L for the left seat 2L, allowing its vertical position to be changed. Figure 1 The diagram shows each headrest in its lowest position. In this position, the right headrest 7R and left headrest 7L protrude relatively large from the upper end of their respective seat backrests 5. The center headrest 7C is configured not to protrude from the upper end of the right seat backrest 5R.

[0062] The upper portions of the right seat backrest 5R and the left seat backrest 5L are provided with resin-made outer cover members 8. On the upper end of the right seat backrest 5R, to the right of the right headrest 7R, a right seat backrest release lever 9R is provided for releasing the right seat backrest 5R when it is in a standing position and is secured to the vehicle body 3. On the upper end of the left seat backrest 5L, to the left of the left headrest 7L, a left seat backrest release lever 9L is provided for releasing the left seat backrest 5L when it is in a standing position and is secured to the vehicle body 3.

[0063] On the upper part of the right seat back 5R, on the left side of the right headrest 7R, there is a seat belt trim 11. This seat belt trim 11 is made of resin and forms an outer cover for the seat belt outlet 11a of the seat belt device 10 for the center seat 2C. The configuration of the seat belt device 10 will be described later.

[0064] The seatbelt outlet for the seatbelt device for the right seat 2R is formed in an internal resin component (not shown), which is located on the right side of the right seat back 5R and serves as a bolster. The seatbelt retractor for the right seat 2R is located inside the internal resin component and is fixed to the vehicle body 3 via a bracket. The configuration associated with the seatbelt for the left seat 2L differs from that associated with the seatbelt for the right seat 2R in that they are symmetrical on both sides of each other, and are otherwise identical.

[0065] Figure 2 This is a perspective view of a car seat 1, showing the frame of the seat back 5 (hereinafter referred to as seat back frame 12 (12R, 12L)). Figure 2 As shown, the seat back 5 includes a seat back frame 12, a flexible pad (not shown) supported on the seat back frame 12, and a cover member 13 covering the pad (see Figure 12). Figure 1 The pad is preferably formed of, for example, polyurethane foam. The skin component 13 is preferably formed of a flexible sheet, such as artificial or synthetic leather, natural leather, or fabric.

[0066] The upper portions of the right seat back 5R and the left seat back 5L are internally equipped with speaker units 14. Each speaker unit 14 includes a pair of speakers 14a disposed on either side of the corresponding right headrest 7R or left headrest 7L. A speaker grille 15 is provided on the front surface of the pair of speaker units 14. Figure 1 ).

[0067] The portion of the seat back frame 12 for the right seat back 5R (hereinafter referred to as the right seat back frame 12R) is formed to serve both the center seat 2C and the right seat 2R located to the right of the center seat 2C. The right seat back frame 12R includes a right panel structure 17R having a rectangular plate shape and a left pivot connection portion 18 and a right pivot connection portion 18 integrally provided on two side portions (more specifically, on the right and left ends) of the lower part of the right panel structure 17R. The left pivot connection portion 18 and the right pivot connection portion 18 are pivotally supported by a body side support member 19 fixed to the body 3, thereby supporting the right seat back frame 12R to pivot about an axis extending in the vehicle width direction.

[0068] The portion of the seat back frame 12 for the left seat back 5L (hereinafter referred to as the left seat back frame 12L) includes a vertically elongated rectangular plate-shaped left panel structure 17L and a left pivot connection 18 and a right pivot connection 18 integrally disposed on the right and left ends of the lower part of the left panel structure 17L. The left pivot connection 18 and the right pivot connection 18 are pivotally supported by a body side support member 19 fixed to the vehicle body 3, thereby supporting the left seat back frame 12L to pivot about an axis extending in the vehicle width direction. The left pivot connection 18 of the right seat back frame 12R and the right pivot connection 18 of the left seat back frame 12L are arranged to insert a body side support member 19 therebetween and are supported by a common body side support member 19.

[0069] The lower part of the central seat backrest 5C of the right seat backrest frame 12R is integrally formed with the left armrest bracket 21 and the right armrest bracket 21 to support the frame of the armrest 6 (hereinafter referred to as the armrest frame 20). The armrest frame 20 has an elongated rectangular frame shape and is supported at its lower end or rear end by the left armrest bracket 21 and the right armrest bracket 21, so as to be able to pivot about an axis extending in the width direction of the vehicle.

[0070] Figure 3 This is a schematic exploded view of the right panel structure 17R of the right seat back 5R. (See diagram below.) Figure 3 As shown, the right panel structure 17R includes a front panel 23 and a rear panel 24 as its main components. The front panel 23 and rear panel 24 are made of steel and are joined together in an overlapping manner to form the main body of the structure. The front panel 23 and rear panel 24 have outer contours of substantially the same size. The front panel 23 and rear panel 24 can be joined together by, for example, laser welding, gas welding, spot welding, etc. In the following, unless otherwise stated, "joining" means joining by any of these methods.

[0071] The rear panel 24 has three relatively small openings 25 along its height direction, located at the center of the upper portion and in the left and right portions of the middle section. The rear panel 24 has two large, inclined ribs 27 that extend continuously from the lower right portion to the upper left portion at an angle. The upper right and lower left portions of the rear panel 24 have multiple small, inclined ribs 28 that are inclined in the opposite direction to the inclination of the large inclined ribs 27. The large and small inclined ribs 27 and 28 are formed to bulge forward by pressing and forming a steel sheet.

[0072] The front panel 23 has four relatively large openings 25 along its height direction at the center of the upper part, the center of the lower part, and in the left and right parts of the middle position. The front panel 23 has two large inclined ribs 27, which extend continuously from the lower right part to the upper left part in an inclined manner. The lower left part of the front panel 23 has two small inclined ribs 28, which are inclined in the opposite direction to the inclined direction of the large inclined ribs 27. The large inclined ribs 27 and the small inclined ribs 28 are formed to bulge forward by pressing and forming a steel sheet.

[0073] Figure 4 This is a 3D diagram of the right panel structure (17R) of the right seat backrest (5R). (See diagram below.) Figure 4 As shown, in addition to the front panel 23 and the rear panel 24, the right panel structure 17R is also provided with a first reinforcing plate 31 and a second reinforcing plate 32 as reinforcing members. The first reinforcing plate 31 has an inclined large rib 27 covering the front panel 23 and has the size and shape surrounding the lower part of the opening 25 at the center of the upper part of the front panel 23. That is, the first reinforcing plate 31 is attached to the right panel structure 17R so as to be connected from one side of the right panel structure 17R (more specifically, from the pivot connection 18). Figure 2 The first reinforcing plate 31 extends from near the right end of the lower portion of the right panel structure 17R to the other side portion of the right panel structure 17R (more specifically, the upper left portion). The first reinforcing plate 31 is attached to the front surface of the front panel 23. The second reinforcing plate 32 has dimensions and shape that surround the upper part of the opening 25 at the center of the upper portion of the front panel 23 and cooperates with the first reinforcing plate 31 to surround the entire periphery of the opening 25. The second reinforcing plate 32 is attached to the front surface of the front panel 23 and the front surface of the first reinforcing plate 31.

[0074] Figure 5 This is a front view of the upper part of the seat back frame 12R used for the right seat back 5R. (As shown) Figure 5 As shown, the upper part of the right panel structure 17R is provided with a pair of right headrest guides 34R for supporting the pillar of the right headrest 7R and a pair of center headrest guides 34C for supporting the center pillar 35 of the center headrest 7C. The pair of right headrest guides 34R and the pair of center headrest guides 34C are made of resin.

[0075] A pair of right headrest guides 34R are supported on the right panel structure 17R via a steel headrest support 36. The headrest support 36 includes a support line 38, a connecting plate 39, and a pair of tubular supports 40 that hold the right headrest guides 34R. The support line 38 has an inverted U-shape and is fixed to the upper portion of the right panel structure 17R. The connecting plate 39 connects to the leg portions of the support line 38. The pair of supports 40 are fixed to the connecting plate 39. A pair of center headrest guides 34C are supported on the right panel structure 17R via the pair of steel supports 40, fixed to the upper portion of the right panel structure 17R, and hold the center headrest guides 34C.

[0076] Next, the seat belt device 10 will be described. The seat belt device 10 includes a seat belt retractor 42 for winding the seat belt 41. The seat belt retractor 42 is located behind the right panel structure 17R and aligned with the upper center opening 25, and is mounted to the right panel structure 17R via a support bracket 43. On the upper portion of the right panel structure 17R, and at a position aligned with the seat belt retractor 42 along the width direction of the seat back frame 12, a seat belt guide mechanism 50 for guiding the seat belt 41 is provided. The seat belt guide mechanism 50 is located offset to the right in the width direction from the center of the seat 2C to which the seat belt 41 is to be fastened.

[0077] Figure 9 It is along Figure 5 The cross-sectional view of the right seat back 5R taken by line IX-IX in the diagram. (See diagram below.) Figure 9 As shown, the seatbelt 41 is pulled upward from the seatbelt retractor 42, extends upward behind the right panel structure 17R, and bends forward to be pulled forward and downward from the right panel structure 17R. When fixed to the right seat back frame 12R via the support bracket 43, the seatbelt retractor 42 extends in the fore-aft direction through the opening 25 at the center of the upper portion of the right panel structure 17R. Thus, rearward protrusion of the seatbelt retractor 42 is suppressed.

[0078] Figure 6 This is a perspective view of the main parts of the right seat back 5R as seen from the front, and Figure 7 This is a diagram of the right seatback (5R) viewed from the rear. (See diagram.) Figures 5 to 7 As shown, the seatbelt guiding mechanism 50 includes a first seatbelt guide 51 and a second seatbelt guide 52, each guiding the seatbelt 41, and a support member 53 supporting the first seatbelt guide 51. The first seatbelt guide 51 supports the seatbelt 41 above the right panel structure 17R. The second seatbelt guide 52 supports the seatbelt 41 behind the right panel structure 17R. The support member 53 supports the first seatbelt guide 51 from below.

[0079] The first seatbelt guide 51 is formed by bending a line into a predetermined shape. The first seatbelt guide 51 has a first end (right end) 51a and a second end (left end) 51b supported at positions spaced apart from each other along the width direction on the upper surface of the right panel structure 17R (specifically, the upper surface of the second reinforcing plate 32). Furthermore, the first seatbelt guide 51 includes a pair of legs 51c extending upward from the first end 51a and the second end 51b, and a middle portion 51d connecting the pair of legs 51c. The middle portion 51d extends substantially horizontally above the first end 51a and the second end 51b and contacts the seatbelt 41 pulled out from the seatbelt retractor 42 to guide the seatbelt 41. However, note that the middle portion 51d of the first seatbelt guide 51 is inclined downward to the right to guide the seatbelt 41 to be pulled out diagonally on the center seat 2C, i.e., inclined from the upper right portion to the lower left portion of the center seat backrest 5C.

[0080] Figure 8 This is a three-dimensional view of the upper part of the right seat back 5R, viewed from above and behind. (As shown...) Figure 7 and Figure 8 As shown, the second seatbelt guide 52 is formed by bending a line into a predetermined shape. The second seatbelt guide 52 has a first end (right end) 52a and a second end (left end) 52b supported on the right panel structure 17R at positions spaced apart from each other along the width direction. Furthermore, the second seatbelt guide 52 includes a pair of legs 52c extending downwardly and backwardly from the first end 52a and the second end 52b in a curved manner, and a middle portion 52d connecting the pair of legs 52c. The middle portion 52d extends substantially horizontally behind the first end 52a and the second end 52b and contacts the seatbelt 41 pulled out from the seatbelt retractor 42 to guide the seatbelt 41. However, note that for the same reason as the middle portion 51d of the first seatbelt guide 51, the middle portion 52d of the second seatbelt guide 52 is inclined downwardly to the right.

[0081] like Figure 5 and Figure 6As shown, the support member 53 includes a wire member 54 made of wire and a connecting bracket 55 made of steel plate. The wire member 54 is formed by bending the wire into a predetermined shape. The wire member 54 includes: a first wire portion 54a and a second wire portion 54b, which extend at least in the vertical direction and have lower ends fixed to the front surface of the right panel structure 17R (specifically, the front surface of the second reinforcing plate 32) at positions spaced apart from each other in the width direction; and a connecting wire portion 54d connecting these wire portions. The connecting wire portion 54d extends at least in the width direction and, in this embodiment, extends parallel to the middle portion 51d of the first seat belt guide 51. The connecting wire portion 54d is disposed below the middle portion 51d of the first seat belt guide 51 and engages with the middle portion 51d in contact with the middle portion 51d. The lower ends of the first wire portion 54a and the second wire portion 54b of the support member 53 form a first fixing portion 53a and a second fixing portion 53b for fixing the support member 53 to the right seat back frame 12R.

[0082] The connecting bracket 55 is formed by pressing a steel plate. The connecting bracket 55 engages with and connects the first wire portion 54a and the second wire portion 54b of the wire member 54. (As shown) Figure 9 As shown, the connecting bracket 55 includes a main portion 55a extending in both the vertical and width directions, and a fixing portion 55b extending forward from the upper portion of the main portion 55a to secure other components. The fixing portion 55b of the connecting bracket 55 has a through hole, and the outer cover member 8 and the seatbelt trim 11 are secured to the fixing portion 55b by fastening members 56 inserted into the through hole, and supported on the left panel structure 17L via the connecting bracket 55. In this embodiment, the fastening member 56 is composed of bolts and nuts. The fastening member 56 can be a fastener or a clip.

[0083] like Figure 6 and Figure 8 As shown, the connecting bracket 55 includes a left extension 55c extending rearward from the left end of the main portion 55a. The left extension 55c engages with the left leg portion 51c of the first seatbelt guide 51. Figure 7 and Figure 8 As shown, the connecting bracket 55 includes a right extension 55d extending rearward from the right end of the main portion 55a. The right extension 55d engages with the support line 38 of the headrest support 36 of the right seat 2R.

[0084] The car seat 1 according to this embodiment is configured as described above. Next, the effects of the seat back 5 configured in this way will be described.

[0085] like Figure 5 and Figure 6As shown, the first seatbelt guide 51 includes a first end 51a and a second end 51b supported on the right seatback frame 12R at positions spaced apart from each other along the width direction of the right seatback frame 12R, and guides the seatbelt 41 pulled out from the seatbelt retractor 42. Figure 9 Furthermore, the seat back 5 includes a support member 53 that supports the intermediate portion 51d between the first end 51a and the second end 51b of the first seat belt guide 51 from below. Thus, since the intermediate portion 51d of the first seat belt guide 51 is supported from below by the support member 53, the support stiffness of the first seat belt guide 51 is increased.

[0086] like Figure 5 As shown, the support member 53 has a first fixing portion 53a and a second fixing portion 53b fixed to the right seat back frame 12R at positions spaced apart from each other along the width direction. The first fixing portion 53a is positioned further outward in the width direction than the first end 51a of the first seat belt guide 51, and the second fixing portion 53b is positioned further outward in the width direction than the second end 51b of the first seat belt guide 51 relative to the middle portion 51d. Therefore, the support stiffness of the support member 53 is increased, and thus the support stiffness of the first seat belt guide 51 supported by the support member 53 is also increased.

[0087] The support member 53 includes a wire member 54 and a connecting bracket 55. The wire member 54 includes a first wire portion 54a and a second wire portion 54b extending at least in the vertical direction, and a connecting wire portion 54d extending at least in the width direction and connecting the first wire portion 54a and the second wire portion 54b. The connecting bracket 55 connects the first wire portion 54a and the second wire portion 54b. By using the wire member 54 in this way, the weight of the support member 53 can be reduced, and the rigidity of the support member 53 can be increased due to the use of the connecting bracket 55.

[0088] like Figure 6 and Figure 8 As shown, the connecting bracket 55 is connected to the first seat belt guide 51. Therefore, the support stiffness of the first seat belt guide 51 is further improved.

[0089] like Figure 6 and Figure 9 As shown, the connecting bracket 55 includes a fixing part 55b, which fixes the outer cover of the seat back 5, such as the outer cover member 8 and the seat belt trim 11. In other words, in addition to serving as a reinforcing member for the support member 53, the connecting bracket 55 also serves as a fixing member for fixing the trim. Therefore, it is not necessary to provide a separate fixing member for the trim, and thus the increase in the number of parts can be suppressed.

[0090] like Figure 2As shown, the right seat back frame 12R is formed to serve both the center seat 2C and the right seat 2R. The seat belt 41 is fastened to the center seat 2C. For the center seat 2C, the first seat belt guide 51 is positioned offset from the center of the seat along the width direction, and the right seat 2R is positioned on the side to which the first seat belt guide 51 of the center seat 2C is offset. Figure 5 As shown, the right seat back frame 12R includes a headrest support 36 that supports the right headrest 7R of the right seat 2R. Figure 7 and Figure 8 As shown, the connecting bracket 55 is connected to the headrest support 36. Thus, since the first seat belt guide 51 is connected to the headrest support 36 via the connecting bracket 55, the support stiffness of the first seat belt guide 51 is further improved.

[0091] like Figure 5 and Figure 9 As shown, the lower ends of the first fixing portion 53a and the second fixing portion 53b of the support member 53 are positioned below the upper end of the seat belt retractor 42. In other words, the seat belt retractor 42 is positioned at a higher position, overlapping the support member 53 along the height direction. Therefore, the seat back 5 can be made compact.

[0092] like Figure 6 and Figure 7 As shown, the first seatbelt guide 51 is made of wire, and its first end 51a and second end 51b are bent to extend along the right seat back frame 12R in the width direction. Thus, even though the first seatbelt guide 51 is made of wire, it can be fixed to the right seat back frame 12R, which extends a predetermined length in the width direction at its first end 51a and second end 51b. Therefore, the support stiffness of the first seatbelt guide 51 is improved.

[0093] like Figures 7 to 9As shown, the seat back 5 includes a second seat belt guide 52 for guiding the seat belt 41, located closer to the seat belt retractor 42 than the first seat belt guide 51. The second seat belt guide 52 has a first end 52a and a second end 52b supported on the right seat back frame 12R at positions spaced apart from each other along the width direction. The first end 52a and the second end 52b of the second seat belt guide 52 are adjacent to and positioned behind the first end 51a and the second end 51b of the first seat belt guide 51. Because the second seat belt guide 52 is positioned as described above, the force transmitted from the seat belt 41 to the first seat belt guide 51 is reduced. Therefore, when a large load is applied to the seat belt 41, such as in a frontal collision, deformation and breakage of the first seat belt guide 51 can be suppressed. Furthermore, since the first end 52a and the second end 52b of the second seat belt guide 52 are arranged adjacent to the first end 51a and the second end 51b of the first seat belt guide 51, the support stiffness of the two seat belt guides can be improved.

[0094] like Figures 2 to 4 As shown, the right panel structure 17R is composed of a front panel 23 and a rear panel 24 that join together, and a pair of pivotal connections 18 are provided along the width direction on the lower portion of the corresponding side portion of the right panel structure 17R and are pivotally supported. The right seat back frame 12R is provided with a first reinforcing plate 31 and a second reinforcing plate 32, which are reinforcing members attached to the right panel structure 17R to extend in the width direction from near the pivotal connections 18 on one side portion of the right panel structure 17R to the upper portion of the other side portion of the right panel structure 17R. Furthermore, as... Figure 5 As shown, the support member 53 is joined to the second reinforcing plate 32. In this way, the support member 53 is joined to the second reinforcing plate 32, which has high rigidity, thus improving the support rigidity of the support member 53 and the first seat belt guide 51.

[0095] The specific implementation methods have been described above, but the present invention can be modified in various ways and is not limited to the above implementation methods.

[0096] In the above embodiment, the first reinforcing plate 31 and the second reinforcing plate 32, which are reinforcing members attached to the right panel structure 17R, are composed of separate members, but they can be configured as a single plate member. Furthermore, the first end 52a and the second end 52b of the second seatbelt guide 52 can be positioned at a distance spaced from the first end 51a and the second end 51b of the first seatbelt guide 51. The second seatbelt guide 52 can be omitted. Additionally, the seatbelt retractor 42 can be positioned below the lower end of the support member 53.

[0097] like Figure 2 As shown, in this embodiment, the right seat back frame 12R is configured to serve both the center seat 2C and the right seat 2R. In another embodiment, the right seat back frame 12R may be configured for the right seat 2R, and the left seat back frame 12L may be configured to serve both the center seat 2C and the left seat 2L. In this case, the seat belt retractor 42 and the seat belt guide mechanism 50 may be located in the left seat back frame 12L, rather than in the right seat back frame 12R, on the right side of the headrest support 36 supporting the left headrest 7L.

[0098] Furthermore, although the support member 53 supporting the first seat belt guide 51 from below includes a wire member 54 and a connecting bracket 55, it may consist only of the wire member 54, or it may consist only of a plate member without the wire member 54. In this case, the support member 53 preferably has a first fixing portion 53a and a second fixing portion 53b fixed to the right seat back frame 12R at positions spaced apart from each other along the width direction. However, note that the first fixing portion 53a and the second fixing portion 53b of the support member 53 may be disposed inside the first end 51a and the second end 51b of the first seat belt guide 51 in the width direction.

Claims

1. A seat back, the seat back comprising: Seat back frame; A first seatbelt guide has a first end and a second end supported on the seat back frame at positions spaced apart from each other along the width direction of the seat back frame, and guides the seatbelt drawn out from the seatbelt retractor. as well as A support member that supports the middle portion of the first seat belt guide between the first end and the second end from below.

2. The seat back according to claim 1, wherein, The support member has a first fixing part and a second fixing part that are fixed to the seat back frame at positions spaced apart from each other along the width direction. The first fixing part is positioned further outward in the width direction than the first end of the first seat belt guide, and The second fixing portion is positioned further outward in the width direction than the second end of the first seat belt guide relative to the middle portion.

3. The seat back according to claim 1 or 2, wherein, The supporting component includes: A line member, the line member comprising a first line portion and a second line portion extending at least in the vertical direction, and a connecting line portion extending at least in the width direction and connecting the first line portion and the second line portion; and A connecting bracket connects the first wire portion and the second wire portion.

4. The seat back according to claim 3, wherein, The connecting bracket is connected to the first seat belt guide.

5. The seat back according to claim 3, wherein, The connecting bracket includes a fixing part for fixing the outer cover of the seat back.

6. The seat back according to claim 3, wherein, The seat back frame is configured to serve both a center seat and side seats. The center seat is the seat to which the seatbelt is to be fastened. For the center seat, the first seatbelt guide is positioned offset from the center of the seat along the width direction. The side seats are positioned on the side to which the first seatbelt guide of the center seat is offset. The seat back frame includes a headrest support that supports the headrest of the side seat, and The connecting bracket is connected to the headrest support.

7. The seat back according to claim 2, wherein, The lower ends of the first fixing part and the lower ends of the second fixing part of the support member are positioned below the upper end of the seat belt retractor.

8. The seat back according to claim 1 or 2, wherein, The first seat belt guide is made of wire, and the first end and the second end of the first seat belt guide are bent to extend along the seat back frame in the width direction.

9. The seat back according to claim 1 or 2, further comprising a second seatbelt guide having a first end and a second end supported on the seat back frame at positions spaced apart from each other along the width direction, and guiding the seatbelt at a position closer to the seatbelt retractor than the first seatbelt guide. in, The first and second ends of the second seat belt guide are positioned adjacent to and behind the first and second ends of the first seat belt guide.

10. The seat back according to claim 1 or 2, wherein, The seat back frame includes: A panel structure, the panel structure being composed of a front panel and a rear panel that are joined together; A pair of pivoting connections, the pair of pivoting connections being disposed on the lower portion of the corresponding side portion of the panel structure in the width direction and being pivotally supported; and A reinforcing member is attached to the panel structure to extend in the width direction from near the pivot connection on one side portion of the panel structure to the upper portion of the other side portion of the panel structure. The supporting member is joined to the reinforcing member.

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