seat backrest

Abstract

Provided is a seat back that is easy to manufacture and enables safety of a rear-seat occupant at the time of a vehicle frontal collision. The seat back (3) has: a back frame (4) that constitutes a skeleton; a back cushion (5) that is a cushioning member and covers at least a front portion and an upper portion of the back frame (4); and a bead foam (7) that is an impact-absorbing member and is installed at a rear upper portion of the back frame (4) and is separate from the back cushion (5).

Description

Technical Field

[0001] This invention relates to seat backrests. Background Technology

[0002] Conventionally, the seatbacks of front-row car seats positioned in front of the rear seats have a structure in which an impact-absorbing element is placed on the upper rear side of the seatback pad to absorb the impact of a rear occupant's head hitting the upper rear side of the seatback during a frontal collision. In the seatback described in Patent Document 1, an impact-absorbing element made of expanded polystyrene is integrally foamed within a protrusion on the upper rear side of the seatback pad.

[0003] Patent document 1: Japanese Patent Application Publication No. 2010-18196. Summary of the Invention The problem that the invention aims to solve

[0004] In the seat back described in Patent Document 1, an impact-absorbing component made of expanded polystyrene integrally foamed on the upper rear side of the seat back cushion body can absorb the impact when the head of a rear passenger occupant collides with the upper rear side of the seat back during a frontal collision. However, since the impact-absorbing component needs to be integrally foamed in an appropriate position during the molding of the seat back cushion, there is a problem that the manufacture of the seat back is not easy.

[0005] In view of such problems, the objective of the present invention is to provide a seat back that is easy to manufacture and can ensure the safety of rear-seat occupants in the event of a frontal collision with a vehicle. Methods for solving problems

[0006] In the first technical solution of the present invention, the seat back is characterized by having: a frame constituting a skeleton; a cushion body as a buffer, covering at least the front and upper parts of the frame; and a beaded foam body as an impact absorber, installed on the upper rear side of the frame and separate from the cushion body.

[0007] According to the first technical solution, since it is not necessary to integrally foam the beaded foam into the liner, the liner is easy to manufacture; the liner and the beaded foam can simply be installed separately onto the frame. Therefore, a seat back that is easy to manufacture and ensures the safety of rear-seat occupants in the event of a frontal collision can be provided.

[0008] The second technical solution of the present invention, based on the first technical solution described above, is characterized in that the liner is not present on the rear side of the bead foam body installed on the frame.

[0009] According to the second technical solution, the bead foam and the liner can be installed onto the frame regardless of the order, thus increasing the freedom of the manufacturing method.

[0010] The third technical solution of the present invention, based on the first or second technical solution described above, includes a main padding body at the center of the seat width direction and side padding bodies disposed on both sides of the main padding body. The main padding body and the side padding bodies are respectively covered by a cover, and the beaded foam is disposed at the rear of the main padding body.

[0011] According to the third technical solution, even in a seat back where the padding body is divided into a main padding body and side padding bodies arranged on both sides of the main padding body, it is possible to provide a seat back that is easy to manufacture and can ensure the safety of rear-seat occupants in the event of a frontal collision of the vehicle.

[0012] The fourth technical solution of the present invention, based on the first technical solution described above, is characterized in that the rear of the bead foam is covered by a backrest panel.

[0013] According to the fourth technical solution, the beaded foam is not visible from the rear, thus improving the appearance of the seat back when viewed from the rear.

[0014] The fifth technical solution of the present invention, based on the first technical solution described above, is characterized in that a tiltable headrest is installed on the upper part of the portion in the frame where the bead foam is installed.

[0015] According to the fifth technical solution, even in seat backs equipped with reclining headrests, it is possible to provide seat backs that are easy to manufacture and can ensure the safety of rear-seat occupants in the event of a frontal collision. Attached Figure Description

[0016] Figure 1 This is a perspective view of a car seat with a seat back according to an embodiment of the present invention, viewed from a diagonal front. Figure 2 It is along Figure 1 A cross-sectional view shown by cutting along line II-II. Figure 3 This is a perspective view of the portion of the seat back frame in the above embodiment where the beaded foam is installed, viewed from a slightly rearward angle. Figure 4 This is a perspective view of the part of the seat back frame in the above embodiment where the beaded foam is installed, viewed from a diagonal front. Figure 5 It is along Figure 3 A cross-sectional view shown by cutting along the V-V line. Figure 6 It is along Figure 3 A sectional view shown by cutting along the VI-VI line. Detailed Implementation

[0017] Figures 1-6 An embodiment of the present invention is shown. This embodiment is an example of applying the present invention to a seat back 3 in an automobile seat 1. In each figure, arrows indicate the directions in which the automobile seat 1 is installed in an automobile. In the following description, the description of directions is based on these directions. The automobile seat 1 includes a seat cushion 2 as a seating part and a seat back 3 as a backrest.

[0018] like Figure 1 As shown, the seat cushion 2 is mounted and fixed to the floor F, which is part of the vehicle body. The seat back 3 is configured such that its lower end is connected to the rear end of the seat cushion 2 via a tilt adjuster (not shown), allowing adjustment of the fore-and-aft tilt angle relative to the seat cushion 2.

[0019] like Figures 1-4 As shown, the seat backrest 3 has a backrest frame 4 as a skeleton, a backrest pad 5 as a cushioning member, a backrest cover 6 as an outer layer, and a beaded foam body 7 as an impact-absorbing member. Furthermore, the seat backrest 3 has: a main body portion 31 in the central part of the seat width direction, which mainly supports the waist and back of the seated occupant from the rear; and a pair of side portions 32, disposed on the left and right sides of the main body portion 31, which mainly support the waist and back of the seated occupant from the sides. Here, the backrest frame 4 and the backrest pad 5 correspond to the "frame" and "pad" in the claims, respectively.

[0020] like Figures 2-4 As shown, the backrest frame 4 has: a pair of left and right side frames 41 extending in the vertical direction on the left and right sides; and an upper frame 42 connecting the upper ends of each side frame 41 to each other. Each side frame 41 is approximately U-shaped with a horizontal cross-section opening inward in the width direction of the seat.

[0021] like Figures 2-6As shown, the upper frame 42 has a generally box-shaped front portion 43 that opens to the rear and a generally box-shaped rear portion 44 that opens to the front. The front portion 43 has: an upper flange 43a extending generally upward at the upper end; a lower flange 43b extending generally downward at the lower end; and a pair of left and right side flanges 43c extending outward in the width direction of the seat at the left and right ends. A pair of left and right notches 43d extending in the vertical direction are formed on the front portion 43. The pair of left and right notches 43d are for the support of a reclining headrest (not shown) to be arranged in a way that allows it to recline forward and backward. Here, a reclining headrest refers, for example, to the headrest disclosed in Japanese Patent Application Publication No. 2019-73095. The pair of left and right side flanges 43c of the front portion 43 are connected to each side frame 41 by welding. The rear portion 44 has: an upper flange 44a extending substantially upward at the upper end; a lower flange 44b extending substantially downward at the lower end; and a pair of left and right side flanges 44c extending outward in the width direction of the seat at the left and right ends. A generally rectangular connecting hole 44d is formed at the center of the rear portion 44 in the left-right direction. The connecting hole 44d is used for inserting and positioning the protrusion 76 of the bead foam 7 when it is installed on the rear portion 44. A movement inhibiting portion 44e extending rearward is formed at the center of the upper flange 44a in the left-right direction. The movement inhibiting portion 44e functions to inhibit the bead foam 7 installed on the rear portion 44 from moving forward and upward by a predetermined amount or more. The rear portion 44 is connected to the front portion 43 by fastening the upper flange portion 44a to the upper flange portion 43a of the front portion 43 using bolts / nuts 45.

[0022] like Figures 2-6 As shown, the beaded foam 7 is a beaded foam molded body made of olefin resins such as polyethylene resin and polypropylene resin, and has a density of about 0.03 g / cm³. The elastic modulus of the beaded foam 7 is higher than that of the backrest pad 5 and it is a rigid part, with excellent impact absorption capacity. The beaded foam 7 is a roughly rectangular prism shape that is longer in the left-right direction, and has a front part 71, a rear part 72, an upper part 73, a lower part 74, and a pair of left and right side parts 75. The left-right dimension of the beaded foam 7 is set to be slightly shorter than the left-right dimension of the main body part 31. A protrusion 76 with a roughly rectangular vertical cross section and extending forward is formed in the center of the left-right direction of the front part 71. A protruding strip 77 extending upward is formed on the rear end side of the upper part 73. When an impact force is applied to the beaded foam 7 from the rear and above, the protruding strip 77 abuts against the rear end of the movement inhibition part 44e of the upper frame 42, thereby inhibiting forward movement by more than a predetermined amount.

[0023] like Figure 2As shown, the backrest pad 5 is a foamed molded polyurethane resin with a density of about 0.04 g / cm³, which is installed on the backrest frame 4 to cover the front and upper parts of the backrest frame 4.

[0024] like Figure 1 and Figure 2 As shown, the backrest cover 6 is formed as a bag-shaped structure with multiple pieces connected by sewing and opening to the rear. The backrest cover 6 is placed over the backrest pad 5 mounted on the backrest frame 4 from the front, with multiple parts on the front side connected to the backrest pad 5 and multiple parts on the outer periphery connected to the backrest frame 4, thereby forming the seat back 3.

[0025] like Figure 2 As shown, the seat backrest 3 is assembled as follows. First, the beaded foam 7 is installed in the rear portion 44 of the upper frame 42 of the backrest frame 4. At this time, the protrusion 76 of the beaded foam 7 is inserted into the connecting hole 44d of the rear portion 44 for positioning, and the front part 71 of the beaded foam 7 is connected to the rear portion 44 using double-sided tape. Next, the backrest pad 5 is covered to cover the front and upper parts of the backrest frame 4, and a backrest cover 6 is placed on top of it and connected to the backrest pad 5 and the backrest frame 4. Finally, a resin backrest panel 8 is installed from the rear so that the backrest pad 5 and the backrest frame 4 are not visible from the outside. In addition, the backrest panel 8 is divided into an upper cover portion 81 that mainly covers the rear part 72 of the beaded foam 7 and a lower cover portion 82 that covers the portion below the upper cover portion 81.

[0026] The above-described embodiment achieves the effects described below. The seat back 3 includes a backrest frame 4, a backrest pad 5, and a beaded foam 7 mounted on the upper rear side of the backrest frame 4 and separate from the backrest pad 5. Therefore, it is not necessary to integrally foam the beaded foam 7 with the backrest pad 5, thus simplifying the manufacture of the backrest pad 5; it is sufficient to simply install the backrest pad 5 and the beaded foam 7 separately onto the backrest frame 4. This provides a seat back 3 that is easy to manufacture and ensures the safety of rear-seat occupants in the event of a frontal collision.

[0027] Furthermore, there is no backrest padding 5 on the rear side of the beaded foam 7 installed on the backrest frame 4. As a result, the beaded foam 7 and the backrest padding 5 are installed on the backrest frame 4 independently of each other and in no particular order, thus increasing the freedom of the manufacturing method.

[0028] Furthermore, the back of the beaded foam 7 is covered by the backrest panel 8, so the beaded foam 7 is not visible from the rear, thus improving the appearance of the seat back 3 when viewed from the rear.

[0029] Furthermore, a reclining headrest is installed on the upper part of the portion of the backrest frame 4 where the beaded foam 7 is installed. Thus, even in the seat back 3 with the reclining headrest installed, it is easy to manufacture and can ensure the safety of rear-seat occupants in the event of a frontal collision.

[0030] The above description describes specific embodiments, but the present invention is not limited to their appearance or structure. Various changes, additions, and deletions can be made without altering the spirit of the invention. For example, the following methods can be cited.

[0031] 1. In the above embodiment, the backrest pad 5 is configured such that the main body 31 and a pair of left and right side parts 32 are integrated. However, it is not limited to this, and may also have a main pad body in the center of the seat width direction and side pad bodies disposed on both sides of the main pad body, with the main pad body and side pad bodies each covered by a cover body, and the beaded foam body 7 may also be disposed at the rear of the main pad body. Thus, even in a seat back where the pad body is divided into a main pad body and a pair of left and right side pad bodies, a seat back that is easy to manufacture and can ensure the safety of rear passengers in the event of a frontal collision of a vehicle can be provided.

[0032] 2. In the above embodiments, the bead foam 7 is made of olefin resins such as polyethylene resin and polypropylene resin, but it is not limited to this and may also be made of styrene resin.

[0033] 3. In the above embodiments, the present invention is applied to automobile seats, but it can also be applied to seats mounted on airplanes, ships, trams, etc. Symbol Explanation

[0034] 1. Car Seats 3. Seat backrest 4. Backrest frame (frame) 5. Backrest padding (pad body) 7. Beaded foam 8 Backrest 42 Upper frame 43 Front section 44. Rear part.

Claims

1. A seat back, comprising: The framework that forms the skeleton; The padding body, acting as a cushioning element, covers at least the front and upper parts of the frame; and The beaded foam, serving as an impact absorber, is installed on the upper rear side of the frame and is separate from the liner.

2. The seat back according to claim 1, wherein, The liner is not present on the rear side of the beaded foam mounted on the frame.

3. The seat back according to claim 1 or 2, wherein, The cushion body has: a main cushion body at the center in the width direction of the seat and side cushion bodies disposed on both sides of the main cushion body. The main padding body and the side padding bodies are each covered by a cover. The beaded foam is disposed at the rear of the main liner.

4. The seat back according to claim 1, wherein, The back of the bead foam is covered by a back panel.

5. The seat back according to claim 1, wherein, A tiltable headrest is installed on the upper part of the portion of the frame where the beaded foam is installed.

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