Seat back and method for manufacturing seat back

Abstract

The disclosure relates to a seatback and a method of manufacturing a seatback. The present disclosure provides a seatback provided with a first seatback and a second seatback adjacent to the first seatback. The seat back is further provided with a first upper beam portion disposed on the upper end side of the first seat back and extending in the seat width direction, and a second upper beam portion disposed on the upper end side of the second seat back and extending in the seat width direction. Further, in a state where one end side of the first upper beam portion in the lengthwise direction and the other end side of the second upper beam portion in the lengthwise direction overlap each other, the one end side of the first upper beam portion in the lengthwise direction and the other end side of the second upper beam portion in the lengthwise direction are joined to each other.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a seat back having a first seat back and a second seat back adjacent to the first seat back, and a manufacturing method of the seat back. BACKGROUND

[0002] For example, a seat back described in Japanese Patent Application Publication No. 2008-194289 (hereinafter, also referred to as "Patent Document 1") has a first seat back and a second seat back adjacent to the first seat back. The first seat back has a round pipe curved and shaped into an inverted U shape, and a connecting pipe extending along a seat width direction and connecting portions of the round pipe extending along an up-down direction.

[0003] The second seat back has a round pipe curved and shaped into an L shape, and a connecting pipe extending along the seat width direction and connecting portions of the round pipe of each of the first seat back and the second seat back extending along the up-down direction. The round pipe and the like of the second seat back are welded to the round pipe of the first seat back. SUMMARY

[0004] The present disclosure discloses one example of a seat back capable of improving production efficiency, the seat back having a first seat back and a second seat back adjacent to the first seat back.

[0005] It is preferable that the seat back having the first seat back and the second seat back adjacent to the first seat back have, for example, at least one of the following constituent elements.

[0006] That is, the constituent elements include a first upper beam portion disposed at an upper end side of the first seat back and extending along a seat width direction, a cross-sectional shape of the first upper beam portion being formed into a substantially C shape or a substantially L shape, and a second upper beam portion disposed at an upper end side of the second seat back and extending along the seat width direction, a cross-sectional shape of the second upper beam portion being formed into a substantially C shape or a substantially L shape.

[0007] Further, it is preferable that the one end side of the first upper beam portion in the longitudinal direction and the other end side of the second upper beam portion in the longitudinal direction be joined to each other in a state in which the one end side of the first upper beam portion in the longitudinal direction and the other end side of the second upper beam portion in the longitudinal direction overlap each other.

[0008] Thus, in the manufacturing method of the seat back, for example, in a state in which the first seat back is held fixed, the one end side of the first upper beam portion in the longitudinal direction and the other end side of the second upper beam portion in the longitudinal direction can be joined to each other after the second seat back is assembled to the first seat back from a front of the first seat back.

[0009] Further, it is possible to easily ensure the joining quality of the joint portion joined by welding or the like and reduce the manufacturing man-hours of the seat back. In addition, it is possible to easily apply the same manufacturing method as that of the seat back to seat backs of various specifications such as different sizes.

[0010] In addition, the seat back may, for example, be configured as follows.

[0011] That is, it is preferable that the seat back further include a side frame disposed at one end side of the first seat back in the seat width direction and extending in the vertical direction, the side frame being joined to one end side of the first upper beam portion in the longitudinal direction; a lower beam portion provided at a position lower than the second upper beam portion in the second seat back and extending in the seat width direction, a cross-sectional shape of the lower beam portion being formed in a substantially C shape; and a panel member, the second upper beam portion and the lower beam portion both being joined to the panel member, and it is preferable that the other end of the lower beam portion in the longitudinal direction be joined to the side surface of the side frame. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a view showing a seat back of the first embodiment.

[0013] Figure 2 is a view showing a structure of the first seat back of the first embodiment.

[0014] Figure 3 is a view showing a first upper beam portion of the first embodiment.

[0015] Figure 4 is a view showing a connecting structure between the first seat back and the second seat back of the first embodiment.

[0016] Figure 5 is a view showing a structure of the second seat back of the first embodiment.

[0017] Figure 6 is a view showing a second upper beam portion of the first embodiment.

[0018] Figure 7 is a view showing the second seat back of the first embodiment. DETAILED DESCRIPTION

[0019] An exemplary embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0020] The following embodiment of the present invention shows one example of an embodiment within the technical scope of the present disclosure. That is, the technical solutions and the like recited in the claims are not limited to the specific structures or configurations and the like shown in the following embodiment.

[0021] This embodiment is an example in which the seat back of the present disclosure is applied to a seat (hereinafter referred to as "vehicle seat") installed in a vehicle or the like. The arrows and the like indicated in each drawing represent directions for facilitating understanding of the mutual relationship of the drawings and the shape of the components or parts, and the like.

[0022] Therefore, the seat back is not limited to the directions indicated in each drawing. The directions shown in each drawing are directions in a state in which the vehicle seat of this embodiment is assembled in a vehicle.

[0023] For the components or parts described with at least the reference numerals, at least one is provided unless it is previously declared to be "only one" or the like. That is, in the case where it is not previously declared to be "one" or the like, the component can be provided with two or more. The seat back of the present disclosure is provided with at least one of the components or parts described with at least the reference numerals and the like, and at least one of the configuration parts illustrated.

[0024] (First Embodiment)

[0025] <1. Outline of seat back>

[0026] This embodiment is an example of a seat back for a rear seat of a vehicle. Specifically, as shown in Figure 1 , the seat back 1 is provided with a first seat back 2 and a second seat back 3, and the like.

[0027] The seat back 1 is a part for supporting the back of a seated person. Also, the second seat back 3 is adjacent to the first seat back 2 at a position offset in the seat width direction with respect to the first seat back 2.

[0028] The first seat back 2 is a seat back for a vehicle right seat in a three-seater rear seat. The second seat back 3 is a seat back for a center seat. The first seat back 2 and the second seat back 3 each have a back frame, a cushion member such as a cushion pad, and a skin portion, and the like.

[0029] <2. Detailed configuration of seat back>

[0030] <2.1 Back frame of first seat back>

[0031] As shown in Figure 2 , the back frame 20 of the first seat back 2 is provided with a frame main body 21 and a back panel 22, and the like. The frame main body 21 has a rectangular frame shape. Specifically, the frame main body 21 has at least a first side frame 23, a second side frame 24, an upper beam portion 25, and a lower beam portion 26, and the like.

[0032] The first side frame 23 is a strength member disposed at one end side in the seat width direction (left end side in the present embodiment) and extending in the up-down direction. The second side frame 24 is a strength member disposed at the other end side in the seat width direction (right end side in the present embodiment) and extending in the up-down direction.

[0033] The upper beam portion 25 is a member extending in the seat width direction and linking the upper end sides of the first side frame 23 and the second side frame 24 to each other. The cross-sectional shape of the upper beam portion 25 is formed in a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment) or a substantially L-letter shape with the rear side open.

[0034] In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment). Figure 3 Figure 3 In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment).

[0035] In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment). Figure 3 In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment).

[0036] In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment).

[0037] Figure 4 In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment).

[0038] In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment). Figure 2 In addition, in the present embodiment, as shown in FIG. 1, the cross-sectional shape of a region LI in the upper beam portion 25, which is sandwiched by the side end portions (right end portions in the present embodiment) of the first side frame 23 and the second side frame 24, is a substantially C-letter shape (substantiallyコ-letter shape in the present embodiment).

[0039] ​​The backrest panel 22 is a plate-shaped member made of metal, which is disposed on the back side of the frame main body 21 and covers the entire back surface of the frame main body 21. Further, a curled portion 22A is provided on the outer edge portion of the backrest panel 22 (excluding the outer edge portion on the lower end side).

[0040] The curled portion 22A is a portion curved in a circular arc shape. The curled portion 22A is an integrated member in which the outer edge portion of the plate-shaped backrest panel 22 is subjected to plastic working so as to be integrated with the backrest panel 22. Further, the first side frame 23, the second side frame 24, the upper beam portion 25, the lower beam portion 26, and the backrest panel 22 are joined to each other by welding.

[0041] <2.2 Backrest frame of the second seat backrest>

[0042] As shown in Figure 5 , the backrest frame 30 of the second seat backrest 3 is provided with a backrest panel 31, an upper beam portion 32, a lower beam portion 33, and a side frame (not shown), and the like.

[0043] The backrest panel 31 is a plate-shaped member made of metal or resin, which is one example of a panel member, and the upper beam portion 32 and the lower beam portion 33 are both joined to the backrest panel 31. Further, in the present embodiment, the backrest panel 31, the upper beam portion 32, the lower beam portion 33, and the side frame are all made of metal. Further, the upper beam portion 32, the lower beam portion 33, and the side frame are joined to the front surface of the backrest panel 31 by welding.

[0044] A curled portion 31A is provided on the outer edge portion of the backrest panel 31 (excluding the outer edge portion on the first seat backrest 2 side). The curled portion 31A is a portion curved in a circular arc shape, and is an integrated member in which the outer edge portion of the plate-shaped backrest panel 31 is subjected to plastic working so as to be integrated with the backrest panel 31.

[0045] As shown in Figure 1 , the upper beam portion 32 is a member disposed on the upper end side of the backrest panel 31 and extending in the seat width direction. The cross-sectional shape of the upper beam portion 32 is formed in a substantially C shape (in the present embodiment, a substantially コ shape) with the rear portion open or a substantially L shape.

[0046] Further, in the present embodiment, as shown in Figure 6 , the cross-sectional shape in a certain range of the upper beam portion 32 from the first seat backrest 2 side end portion (the right end portion in the present embodiment) is a substantially C shape (in the present embodiment, a substantially コ shape). Figure 6 The cross-sectional shape of the end portion on the opposite side (the left end portion in the present embodiment) of the upper beam portion 32 is formed in a cross-sectional shape of an L shape having an upper surface portion and a front surface portion. Figure 6

[0047] As​Figure 1 As shown, the lower beam 33 is a component located in the backrest panel 31 below the upper beam 32 and extending along the width direction of the seat. The cross-sectional shape of the lower beam 33 is formed into a roughly C-shape with an opening at the rear.

[0048] The side frame is a component that sandwiches the upper beam portion 32 and the lower beam portion 33 on opposite sides of the first seat back 2 and extends in the vertical direction. The side frame is joined to one end (the left end in this embodiment) of the upper beam portion 32 and the lower beam portion 33 respectively by welding.

[0049] <2.3 Connection Structure between the First Seat Backrest and the Second Seat Backrest>

[0050] like Figure 7 As shown, both the upper beam portion 32 (hereinafter referred to as "second upper beam portion 32") and the lower beam portion 33 of the second seat back 3 protrude from the outer edge 31B of the back panel 31 toward the side of the first seat back 2 (the right side in this embodiment).

[0051] Moreover, such as Figure 4 As shown, with one end of the upper beam portion 25 of the first seat back 2 (hereinafter referred to as "the first upper beam portion 25") in the longitudinal direction overlapping the other end of the second upper beam portion 32 in the longitudinal direction, the one end of the first upper beam portion 25 in the longitudinal direction and the other end of the second upper beam portion 32 in the longitudinal direction are joined together by welding.

[0052] Specifically, with the right end of the second upper beam 32 overlapping the left end of the first upper beam 25 from the outside, the right end of the second upper beam 32 and the left end of the first upper beam 25 are joined together by arc welding. The symbols W1 and W2 indicate the weld seam of this arc welding.

[0053] like Figure 1 As shown, the lower beam 33 is joined to the side of the first side frame 23 by arc welding at its other end in the longitudinal direction (the right end in this embodiment). In addition, the joints W3 and W4 are formed by welding from the side of the second seat back 3, and the joint W5 is formed by welding from the side of the first seat back 2.

[0054] <2.4 Overview of the manufacturing method of seat back>

[0055] The first seat back 2 and the second seat back 3 are manufactured independently. Also, in the manufacturing process of the seat back 1, in the joining process of the first seat back 2 and the second seat back 3, in a state where the first seat back 2 is fixed and held by a jig (not shown), an assembly robot (not shown) assembles the second seat back 3 to the first seat back 2 from the front of the first seat back 2.

[0056] Thus, the right end side of the second upper beam portion 32 becomes a state of overlapping with the left end side of the first upper beam portion 25 in a manner of covering the left end side of the first upper beam portion 25 from the outside. Next, a welding robot or a welding operator joins the right end side of the second upper beam portion 32 and the left end side of the first upper beam portion 25 together by arc welding.

[0057] Also, in the present embodiment, the mass and the outer dimensions of the first seat back 2 are larger than those of the second seat back 3, and thus the first seat back 2 is fixed and held. Thus, if the mass and the outer dimensions of the second seat back 3 are larger than those of the first seat back 2, the second seat back 3 is fixed and held.

[0058] That is, in the first seat back 2 and the second seat back 3, the "seat back with larger mass or outer dimensions" is fixed and held, and the "seat back with smaller mass or outer dimensions" is assembled to the "seat back with larger mass or outer dimensions" by the assembly robot.

[0059] Further, in the present embodiment, since the outer dimensions of the back panel 22 are larger than those of the frame body 21, the second seat back 3 is assembled to the first seat back 2 from the front. Thus, if the outer dimensions of the frame body 21 are larger than those of the back panel 22, the first seat back 2 can be assembled to the second seat back 3 from the rear.

[0060] <3. Features of the seat back and the manufacturing method of the seat back of the present embodiment>

[0061] In the seat back 1 of the present embodiment, in a state where the left end side of the first upper beam portion 25 of the first seat back 2 overlaps with the right end side of the second upper beam portion 32 of the second seat back 3, the left end side of the first upper beam portion 25 and the right end side of the second upper beam portion 32 are joined to each other.

[0062] Thus, in manufacturing the seat back 1, as described above, in a state where the first seat back 2 is fixed and held, after the second seat back 3 is assembled to the first seat back 2 from the front of the first seat back 2, the left end side of the first upper beam portion 25 and the right end side of the second upper beam portion 32 can be joined to each other.

[0063] Further, it is possible to easily ensure the joining quality of the joint portion joined by welding or the like and reduce the manufacturing man-hours of the seat back 1. In addition, it is possible to easily apply the same manufacturing method as that of the seat back 1 to seat backs of various specifications such as different sizes, and thus it is possible to reduce the manufacturing man-hours and reduce the manufacturing cost.

[0064] In addition, in the invention described in Patent Literature 1, the pipe members are welded together in a state of being assembled from multiple directions. Therefore, it is difficult to ensure the joining quality of the welded portion and reduce the manufacturing man-hours (particularly, the assembly man-hours).

[0065] In this regard, in the seat back 1 of the present embodiment, after the first seat back 2 and the second seat back 3 are manufactured, the left end side of the first upper beam portion 25 and the right end side of the second upper beam portion 32 are overlapped and welded, and thus it is possible to easily ensure the joining quality and reduce the manufacturing man-hours.

[0066] (Other Embodiments)

[0067] In the above embodiment, the first upper beam portion 25 and the second upper beam portion 32 are joined to each other by arc welding. However, the present disclosure is not limited thereto. That is, for example, the present disclosure can be configured such that the first upper beam portion 25 and the second upper beam portion 32 are joined to each other by an adhesive.

[0068] In the above embodiment, the first upper beam portion 25 and the second upper beam portion 32 are joined to each other in a state of being overlapped with each other such that the left end side of the first upper beam portion 25 covers the right end side of the second upper beam portion 32 from the outside. However, the present disclosure is not limited thereto.

[0069] That is, for example, the present disclosure can be configured such that the first upper beam portion 25 and the second upper beam portion 32 are joined to each other in a state of being overlapped with each other such that the left end side of the first upper beam portion 25 covers the right end side of the second upper beam portion 32 from the outside.

[0070] In the above embodiment, the seat back of the present disclosure is applied to a vehicle. However, the application of the invention disclosed in the present specification is not limited thereto. That is, the present disclosure can also be applied to a seat used in a vehicle such as a railway vehicle, a ship, and an aircraft, and a fixed seat used in a theater or a home or the like.

[0071] Furthermore, the present disclosure is not limited to the above-described embodiments as long as the gist of the application described in the above-described embodiments is satisfied. Therefore, it can be a structure in which at least two of the above-described embodiments are combined, or a structure in which any one of the constituent elements illustrated in the above-described embodiments is omitted, or a structure in which any one of the constituent elements described using reference numerals in the above-described embodiments is omitted.

Claims

1. A seat back, comprising a first seat back and a second seat back adjacent to the first seat back, characterized in that it comprises: A first upper beam portion, wherein the first upper beam portion is disposed on the upper end side of the first seat back and extends along the width direction of the seat, the cross-sectional shape of the first upper beam portion is formed as approximately C-shaped or approximately L-shaped; and The second upper beam is disposed on the upper side of the second seat back and extends along the width direction of the seat. The cross-sectional shape of the second upper beam is approximately C-shaped or approximately L-shaped. With one end of the first upper beam in the longitudinal direction and the other end of the second upper beam in the longitudinal direction overlapping each other, the one end of the first upper beam in the longitudinal direction and the other end of the second upper beam in the longitudinal direction are joined together.

2. The seat backrest according to claim 1, characterized in that, It also has: A side frame is disposed on one end of the first seat back in the width direction and extends in the vertical direction, and the side frame is joined to one end of the first upper beam in the longitudinal direction. The lower beam is located in the second seat back at a position lower than the second upper beam and extends along the width of the seat. The cross-sectional shape of the lower beam is approximately C-shaped. as well as The panel component, wherein both the second upper beam and the lower beam are joined to the panel component. The lower beam is joined to the side of the side frame at its other end in the longitudinal direction.

3. A method for manufacturing a seat back, characterized in that, For use in manufacturing the following seat backrest, the seat backrest having: First seat back; The second seat back is adjacent to the first seat back. A first upper beam portion, wherein the first upper beam portion is disposed on the upper end side of the first seat back and extends along the width direction of the seat, the cross-sectional shape of the first upper beam portion is formed as approximately C-shaped or approximately L-shaped; and The second upper beam is disposed on the upper side of the second seat back and extends along the width direction of the seat. The cross-sectional shape of the second upper beam is approximately C-shaped or approximately L-shaped. With one end of the first upper beam in the longitudinal direction and the other end of the second upper beam in the longitudinal direction overlapping each other, the one end of the first upper beam in the longitudinal direction and the other end of the second upper beam in the longitudinal direction are joined together. The method for manufacturing the seat back includes the following steps: With the first seat backrest fixed in place, the second seat backrest is assembled to the first seat backrest from the front, such that one end of the first upper beam in the longitudinal direction and the other end of the second upper beam in the longitudinal direction are joined together.

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