Seat back

Abstract

The present invention provides a seat back capable of reducing a height difference that may occur at a joining portion between a back plate and a back cushion. A seat back (1) is provided with: a back plate (4); a backrest cushion (3) provided so as to abut against the back plate (4) from the seat surface side; and a backrest cover (5) covering the backrest cushion (3) and the back plate (4). The back plate (4) is provided with a peripheral edge extending part (4A) which extends from the peripheral edge of the back plate (4) to the seat surface side in a bending manner. The backrest cushion (3) is provided with a cushion protrusion (3A) that protrudes outward from the peripheral extension (4A) and comes into contact with the peripheral extension (4A) from the seat surface side. The backrest cover (5) covers the cushion pad projection (3A) and the peripheral extending part (4A) in a pressing manner that the cushion pad projection (3A) is flattened due to bulging of the cushion pad projection (3A).

Description

Technical Field

[0001] The present invention relates to a seat backrest. More specifically, it relates to a seat backrest having a back plate, a backrest cushion provided so as to abut against the back plate from the seat front side, and a backrest cover covering the backrest cushion and the back plate. Background Art

[0002] In Patent Document 1, a structure is disclosed in which a back plate is provided on the back surface of a seat backrest. The back surface of the back plate is covered with a back cover piece of a backrest cover that covers the surface of the seat backrest.

[0003] Prior Art Documents

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-281801 Summary of the Invention

[0005] Problems to be Solved by the Invention

[0006] In the structure described in Patent Document 1, at the mating portion between the back plate and the backrest cushion provided on its surface, a height difference is likely to occur due to the flattening of the backrest cushion. Therefore, on the backrest cover covering their surfaces, a protruding line or a meandering of the sewing line is likely to occur due to the height difference. Accordingly, the present invention provides a seat backrest capable of reducing the height difference that may occur at the mating portion between the back plate and the backrest cushion.

[0007] Means for Solving the Problems

[0008] As a means for solving the above problems, the seat backrest of the present invention takes the following means.

[0009] That is, a first aspect of the present invention is a seat backrest having: a back plate; a backrest cushion provided so as to abut against the back plate from the seat front side; and a backrest cover covering the backrest cushion and the back plate, wherein the back plate has a peripheral edge protruding portion protruding from the peripheral edge of the back plate toward the seat front side in a curved manner, and in a state where the backrest cushion and the back plate are not covered with the backrest cover, the backrest cushion has a cushion convex portion that bulges out so as to protrude outward more than the peripheral edge protruding portion and abuts against the peripheral edge protruding portion from the seat front side, and in a state where the backrest cushion and the back plate are covered with the backrest cover, the backrest cover covers the cushion convex portion and the peripheral edge protruding portion in a manner accompanying the pressing that flattens the bulge of the cushion convex portion.

[0010] According to the first technical solution, the amount of flattening in which the cushion convex portion is flattened as the backrest cover is stretched can be limited to the position where the backrest cover is pressed against the peripheral edge protruding portion of the back plate and is locked. As a result, the height difference that may occur at the mating portion between the flattened cushion convex portion and the peripheral edge protruding portion of the back plate can be reduced. Therefore, the backrest cover can be stretched appropriately.

[0011] The second technical solution of the present invention is based on the above first technical solution, wherein the back plate further has an inner support portion, and the inner support portion protrudes toward the seat front side so as to support the buffer cushion convex portion from the inner side in the bulging direction.

[0012] According to the second technical solution, the cushion convex portion can be supported on the back surface to prevent it from being overly pressed by an externally applied load or the stretching force of the backrest cover. As a result, the height difference that may occur at the mating portion between the buffer cushion convex portion and the peripheral edge protruding portion of the back plate can be reduced more appropriately.

[0013] The third technical solution of the present invention is based on the above first or second technical solution, and the peripheral edge where the peripheral edge protruding portion of the back plate is formed is the upper edge of the back plate.

[0014] According to the third technical solution, the upper edge portion of the seat backrest that is easily visible to the user can be completed beautifully.

[0015] The fourth technical solution of the present invention is based on the above first or second technical solution, and the peripheral edge protruding portion of the back plate is bent so as to bend toward the seat surface side.

[0016] According to the fourth technical solution, it is possible to avoid a prominent line that deteriorates the aesthetics at the portion of the backrest cover covering the peripheral edge of the back plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view showing a schematic structure of a seat backrest according to the first embodiment.

[0018] Figure 2 is a rear view of the seat backrest.

[0019] Figure 3 is Figure 2 a cross-sectional view taken along line III-III.

[0020] Figure 4 is a cross-sectional view corresponding to Figure 3 before the backrest cover is stretched. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Hereinafter, a mode for implementing the present invention will be described with reference to the drawings.

[0022] <<First Embodiment>>

[0023] (Schematic structure of the seat back 1)

[0024] First, use Figures 1 to 4 to describe the structure of the seat back 1 of the first embodiment of the present invention. In addition, in the following description, when indicating the front-back, up-down, left-right, etc. directions, it refers to the respective directions shown in each figure.

[0025] In addition, when adding "seat" to each direction such as "seat width direction" to indicate, it refers to the respective directions based on the seat back 1. In addition, in the following description, when no specific reference figure is shown, or when there is no corresponding reference numeral in the reference figure, appropriately refer to Figures 1 to 4 any one of the figures in

[0026] As Figures 1 to 3 shown, the seat back 1 of the present embodiment is configured as the backrest of the rear seat that constitutes the last row of seats in the vehicle. The seat back 1 has: a metal backrest frame 2 that constitutes its skeleton, and a backrest cushion 3 made of foamed polyurethane that covers the front part of the backrest frame 2.

[0027] In addition, the seat back 1 has a resin-made flat plate-shaped back plate 4 provided on its back surface, and a backrest cover 5 that covers the entire surface of the seat back 1. The back plate 4 is mounted on the backrest frame 2 from the back side, and has a structure that forms a substantially flat hard surface on the back of the seat back 1. The backrest frame 2 is assembled into a shape that is frame-shaped when viewed from the front.

[0028] The backrest cushion 3 is assembled to the backrest frame 2 that is frame-shaped when viewed from the front in a manner of covering from the front side. And the backrest cushion 3 is pulled backward in such a way that its respective peripheral portions in the up-down, left-right directions roll up the respective frame edge portions of the backrest frame 2 from the outer peripheral side. Thus, the respective peripheral portions of the backrest cushion 3 are installed in a manner of abutting against the back plate 4 from the front side (seat front side) along with the stretching of the backrest cover 5 covering its surface.

[0029] The backrest cover 5 is formed into a bag shape having a back cover portion 5A that covers the back of the seat back 1 and a top plate cover portion 5B that covers the upper, lower, left, right, and front surfaces of the seat back 1 except for the back. The back cover portion 5A is composed of a single covering material. The top plate cover portion 5B is configured by joining together a plurality of fabric pieces cut to match the shapes of the surfaces of the seat back 1 except for the back into one piece. The top plate cover portion 5B has a softer structure than the back cover portion 5A.

[0030] The top plate cover portion 5B and the back cover portion 5A are joined by sewing their upper edges to each other (refer to Figure 3The suture S shown). The side edges of the top plate cover portion 5B and the back cover portion 5A are joined to each other in an openable and closable manner by the joining of linear connecting members (not shown) provided along their respective edges.

[0031] After the backrest cover 5 is installed on the backrest frame 2 with the above-mentioned backrest plate 4 and the backrest cushion 3 installed thereon, it is installed so as to cover them from above. And after the above-mentioned covering, the side edges between the top plate cover portion 5B and the back cover portion 5A of the backrest cover 5 are closed by a linear connecting member (not shown).

[0032] Thereby, the backrest cover 5 is closed into a bag shape, and the back cover portion 5A and the top plate cover portion 5B are stretched so as to closely adhere to the backrest plate 4 and the backrest cushion 3, respectively. By this stretching, as Figure 3 shown, the backrest cushion 3 is fixed in position so as to be pressed by the backrest frame 2 and the backrest plate 4. The lower end of the top plate cover portion 5B of the backrest cover 5 is pulled backward in a manner of being wound around the backrest cushion 3 and fixed in a manner of being joined to the lower end of the back cover portion 5A.

[0033] When the backrest cover 5 is stretched, if a height difference occurs at the mating portion of the peripheral edge where the backrest cushion 3 and the backrest plate 4 are mated, the suture S that stitches the upper edges of the top plate cover portion 5B and the back cover portion 5A to each other is likely to meander. In addition, a prominent line where the peripheral edge of the backrest plate 4 with high rigidity floats on the surface of the backrest cover 5 is likely to occur.

[0034] Therefore, in order to address such problems, a structure capable of reducing the height difference that may occur at their mating portion is provided between the backrest cushion 3 and the backrest plate 4. In addition, since the side edges between the top plate cover portion 5B and the back cover portion 5A are joined by a linear connecting member (not shown) to form a structure with relatively high rigidity, such problems are less likely to occur.

[0035] Hereinafter, the structure of the mating portion between the backrest cushion 3 and the backrest plate 4 will be described in detail. As Figure 4 shown, a peripheral edge protruding portion 4A that protrudes in a manner of bending toward the front side that becomes the seat front side is formed at the upper edge of the backrest plate 4. The peripheral edge protruding portion 4A is formed to continuously extend along the upper edge of the backrest plate 4 with the same cross-section over substantially the entire region in the seat width direction.

[0036] The peripheral edge protruding portion 4A does not protrude from the upper edge of the backrest plate 4 in a bent shape toward the front side, but protrudes in a curved shape such that a gentle curved surface A3 is formed on the outer peripheral surface as the base. Thereby, on the surface of the backrest cover 5 covering the peripheral edge of the backrest plate 4, a prominent line that deteriorates the appearance is less likely to appear.

[0037] At the upper edge portion of the backrest cushion 3, at a portion that abuts against the peripheral edge protruding portion 4A of the back plate 4 from the front side, a cushion convex portion 3A is formed that bulges upward in a manner that protrudes outward more than the peripheral edge protruding portion 4A. The cushion convex portion 3A is formed to continuously extend in the same cross-section along substantially the entire region in the seat width direction of the upper edge portion of the backrest cushion 3.

[0038] The cushion convex portion 3A has a shape that is rounded with a slightly forward bend and stands upward facing the rear surface A1 of the peripheral edge protruding portion 4A. The upper surface A2 of the cushion convex portion 3A is a curved surface that is curved in a convexly curved shape in a side view so as to gently descend as it approaches the front. In this way, the cushion convex portion 3A has the following shape: the rear side portion facing the peripheral edge protruding portion 4A bulges out the most, and bulges out in a substantially right-angled triangular shape in a side view with the bulge gradually decreasing as it approaches the front.

[0039] As Figure 3 shown, the cushion convex portion 3A is pressed downward from above in a manner that is flattened by the top plate covering portion 5B as the backrest cover 5 is stretched over its surface. Specifically, the cushion convex portion 3A is pressed downward by the top plate covering portion 5B so that as the backrest cover 5 is stretched to a position where it is caught by pressing against the peripheral edge protruding portion 4A of the back plate 4, the cushion convex portion 3A is flattened to a height position substantially the same as that of the peripheral edge protruding portion 4A.

[0040] At this time, the cushion convex portion 3A is restricted so that even when its maximum flattening amount is reached, it is only flattened to a position where it has the same height as the peripheral edge protruding portion 4A. The reason is that the backrest cover 5 only presses the cushion convex portion 3A downward to the position where it is caught by pressing against the peripheral edge protruding portion 4A of the back plate 4.

[0041] As a result, the cushion convex portion 3A is actually flattened to a height position substantially the same as that of the peripheral edge protruding portion 4A of the back plate 4 or slightly above the peripheral edge protruding portion 4A due to the stretching force of the backrest cover 5. As a result, the height difference that may occur at the mating portion between the flattened cushion convex portion 3A and the peripheral edge protruding portion 4A of the back plate 4 can be reduced. Thus, the backrest cover 5 can be properly stretched.

[0042] The backrest cushion 3 has a shape in which the rear surface of the portion corresponding to directly below the cushion convex portion 3A is recessed forward more than the rear surface A1 of the cushion convex portion 3A. And a back side support portion 4B is formed on the back plate 4, and the back side support portion 4B protrudes in a flat plate shape so as to be in surface contact with the recessed upper surface, i.e., the seat portion 3B, of the backrest cushion 3 from below. The back side support portion 4B is formed to protrude from the front surface portion of the back plate 4 that is lower than the peripheral edge protruding portion 4A.

[0043] The seat portion 3B is formed to continuously extend with the same cross-section over substantially the entire area of the backrest cushion 3 except for both ends in the seat width direction. The inner support portion 4B is also formed to continuously extend with the same cross-section over substantially the entire area of the back plate 4 except for both ends in the seat width direction.

[0044] The seat portion 3B of the backrest cushion 3 is supported from below by the inner support portion 4B, and the cushion convex portion 3A is supported from the inner side, i.e., the lower side, in its bulging direction. Thereby, the cushion convex portion 3A can be supported from the inside to prevent it from being excessively pressed by an externally applied load or the tension of the backrest cover 5. As a result, the height difference that may occur at the mating portion between the cushion convex portion 3A and the peripheral protruding portion 4A can be more appropriately reduced.

[0045] In summary, the seat back 1 of the present embodiment has the following structure. In addition, the reference numerals in parentheses below are the reference numerals corresponding to the respective structures shown in the above embodiment.

[0046] That is, the seat back (1) has: a back plate (4); a backrest cushion (3) provided so as to abut against the back plate (4) from the seat front side; and a backrest cover (5) covering the backrest cushion (3) and the back plate (4). The back plate (4) has a peripheral protruding portion (4A) that protrudes from its periphery toward the seat front side in a bent manner. The backrest cushion (3) has a cushion convex portion (3A) that bulges out so as to protrude more externally than the peripheral protruding portion (4A) and abuts against the peripheral protruding portion (4A) from the seat front side. The backrest cover (5) covers the cushion convex portion (3A) and the peripheral protruding portion (4A) in a manner that accompanies the pressing that flattens the bulge of the cushion convex portion (3A).

[0047] According to the above structure, the amount of flattening of the cushion convex portion (3A) when the backrest cover (5) is stretched can be limited to the position where the backrest cover (5) presses and is caught by the peripheral protruding portion (4A) of the back plate (4). As a result, the height difference that may occur at the mating portion between the flattened cushion convex portion (3A) and the peripheral protruding portion (4A) of the back plate (4) can be reduced. Therefore, the backrest cover (5) can be appropriately stretched.

[0048] In addition, the back plate (4) further has an inner support portion (4B) that protrudes toward the seat front side in a manner that supports the cushion convex portion (3A) from the inner side in its bulging direction. According to the above structure, the cushion convex portion (3A) can be supported from the inside to prevent it from being excessively pressed by an externally applied load or the tension of the backrest cover 5. Thereby, the height difference that may occur at the mating portion between the cushion convex portion (3A) and the peripheral protruding portion (4A) of the back plate (4) can be more appropriately reduced.

[0049] In addition, the periphery of the peripheral edge protrusion (4A) formed on the back plate (4) is the upper edge of the back plate (4). According to the above structure, the upper edge portion of the seat back that is easily visible to the user can be beautifully completed.

[0050] In addition, the peripheral edge protrusion (4A) of the back plate (4) is bent so as to bend toward the seat front side. According to the above structure, it is possible to avoid a prominent line that deteriorates the aesthetics in the portion of the backrest cover (5) covering the periphery of the back plate (4).

[0051] "Regarding Other Embodiments"

[0052] As described above, one embodiment of the present invention has been described, but the present invention can be implemented in various ways in addition to the above-described embodiment.

[0053] 1. The seat back of the present invention can be applied not only to seats of vehicles such as automobiles and railways but also to seats of vehicles other than airplanes and ships, etc. In addition, the seat back can also be applied to seats other than vehicles.

[0054] 2. The periphery where the peripheral edge protrusion formed on the back plate mates with the cushion protrusion formed on the backrest cushion can be a portion corresponding to the side edge in addition to the portion corresponding to the upper edge of the seat back. In addition, it can also be a portion corresponding to both the upper edge and the side edge.

[0055] 3. The back cover portion and the top plate cover portion of the backrest cover can also be made of the same material as each other. The backrest cover can also be made of a leather material such as synthetic leather or natural leather.

[0056] Explanation of Reference Numerals

[0057] 1 Seat back

[0058] 2 Backrest frame

[0059] 3 Backrest cushion

[0060] 3A Cushion protrusion

[0061] A1 Rear surface

[0062] A2 Upper surface

[0063] 3B Seat portion

[0064] 4 Back plate

[0065] 4A Peripheral edge protrusion

[0066] A3 Bending surface

[0067] 4B Inner support portion

[0068] 5 Backrest cover

[0069] 5A back cover part

[0070] 5B top plate cover part

[0071] S suture

Claims

1. A seat backrest, comprising: a back plate; a backrest cushion disposed to abut against the back plate from the front side of the seat; and a backrest cover covering the backrest cushion and the back plate, The back plate has a peripheral edge protruding portion protruding in a manner of bending from the peripheral edge of the back plate toward the front side of the seat, In a state where the backrest cushion and the back plate are not covered by the backrest cover, the backrest cushion has a cushion convex portion that bulges out in a manner of protruding further outward than the peripheral edge protruding portion and abuts against the peripheral edge protruding portion from the front side of the seat, In a state where the backrest cushion and the back plate are covered by the backrest cover, the backrest cover covers the cushion convex portion and the peripheral edge protruding portion in a manner of accompanying the pressing that flattens the bulge of the cushion convex portion.

2. The seat backrest according to claim 1, wherein, The back plate further has an inner support portion that protrudes toward the front side of the seat in a manner of providing inner support to the cushion convex portion from the inner side in the bulging direction.

3. The seat backrest according to claim 1 or 2, wherein, The peripheral edge where the peripheral edge protruding portion is formed on the back plate is the upper edge of the back plate.

4. The seat backrest according to claim 1 or 2, wherein, The peripheral edge protruding portion of the back plate bends in a manner of bending toward the front side of the seat.

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