JP2017202799A - Seat cover for vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To partially improve extensibility of a seat cover.SOLUTION: A seat cover 4S for a vehicular seat is constituted of an extensible face material. In a seat cover 4S, a high-extensible part 10D that is easily extended and a gradation part 20D that becomes gradually extensible as coming close to the high-extensible part 10D are provided adjacent to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat cover for a vehicle seat having partially different extensibility.

  In this type of vehicle seat, there is a demand to partially vary the elongation characteristics of the seat cover from the viewpoint of improving seat performance. For example, the seat cover material disclosed in Patent Document 1 includes a surface material corresponding to the seat cover of the present invention, a soft cushioning material, a hard cushioning material, and a back surface material. The surface material is a plastic leather face material, and the back material is a cold material face material. Each cushioning material is a mat material made of flexible polyurethane foam, and exhibits a difference in flexibility due to a difference in density. In the known technique, a seat cover material is formed by laminating a surface material, each buffer material, and a back material. At this time, a soft cushioning material is disposed on the seat cover material portion that contacts the back of the occupant, and a hard cushioning material is disposed on the seat cover material portion that contacts the occupant's waist and the like. Thus, the back portion of the occupant and the like are supported with a feeling of fit with the surface material portion in which the relatively soft cushioning material is disposed and easily stretched. Moreover, the waist part of a passenger | crew etc. are firmly supported by the surface material part by which the relatively hard shock absorbing material is arrange | positioned and it was made hard to extend.

Japanese Utility Model Publication No. 63-38898

  By the way, since the structure of a well-known technique requires several types of buffering members separately from a surface material, it was not the structure which can be employ | adopted easily because the number of parts increases. Therefore, it is conceivable that the surface material corresponding to the seat cover of the present invention is formed by stitching a piece of surface material excellent in extensibility and another piece of surface material inferior in extensibility. By doing so, the stretch characteristics of the seat cover material can be partially varied without depending on the cushioning member. However, in a configuration in which pieces of surface materials having different extensibility are simply stitched together, the extensibility of the surface material is clearly different at the boundary between the pieces, so that the passenger may feel uncomfortable and the seat performance may deteriorate. . The present invention has been devised in view of the above points, and the problem to be solved by the present invention is to partially change the stretchability of the seat cover with good performance.

  As means for solving the above problems, the seat cover of the vehicle seat according to the first aspect of the present invention is made of an extensible face material. In this type of seat cover, it is desired that the stretchability can be changed partially with good performance (for example, as much as possible). Therefore, in the present invention, a high-stretching portion that is easily stretched and a gradation portion that is gradually stretched as it approaches the high-stretching portion are provided adjacent to each other. In the present invention, the gradation portion makes the difference in stretchability at the boundary of the high stretch portion that is easy to stretch as much as possible, so that the occupant can be made as uncomfortable as possible.

  A seat cover for a vehicle seat according to a second aspect of the present invention is the seat cover for a vehicle seat according to the first aspect, wherein at least a part of the seat cover is composed of a knitted material as a face material provided with a high extension portion and a gradation portion. Yes. The knitted fabric has a stitch formed by a loop of yarn material having a predetermined length, and another stitch formed by a loop of yarn material longer than the stitch, and the high stretch portion has a gradation portion. Compared to this, it has many other stitches to make it easier to stretch. In the present invention, the stretchability of the high stretch portion and the gradation portion are different depending on the loop length of the stitches constituting the knitted fabric. For this reason, the knitted fabric as the seat cover can have a simple configuration in which it is not necessary to change the knitting method and the constituent yarn extremely for each part.

  The vehicle seat cover of the third invention is the vehicle seat cover of the first or second invention, wherein the high stretch portion and the gradation portion are made of the same material. In the present invention, the high stretch portion and the gradation portion are made of the same thread material, so that these portions can have similar appearances and the design of the seat cover can be improved.

  A seat cover for a vehicle seat according to a fourth aspect of the present invention is the seat cover for a vehicle seat according to any one of the first to third aspects, wherein a low stretch portion that is less likely to stretch than a high stretch portion and a gradation portion is provided. In addition, the gradation portion is disposed between the high extension portion and the low extension portion. In the present invention, by making the difference in stretchability between the high stretch portion that is relatively easy to stretch and the low stretch portion that is relatively difficult to stretch as much as possible by the gradation portion, the occupant is not made to feel uncomfortable as much as possible. It can be configured.

  According to the first aspect of the present invention, the stretchability of the seat cover can be partially changed with good performance. According to the second invention, the stretchability of the seat cover can be partially changed with high performance by a relatively simple configuration. According to the third invention, the stretchability of the seat cover can be partially changed with better performance. According to the fourth aspect of the invention, the stretchability of the seat cover can be partially changed with better performance.

It is a front view of a vehicle seat. It is an enlarged front view of a part of the seat cover showing the low extension portion. It is an enlarged front view of a part of the seat cover showing the high extension portion. It is a schematic diagram showing each stitch of a low extension part, a gradation part, and a high extension part.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. In FIG. 1, for convenience, arrow lines indicating the vertical direction and the horizontal direction of the vehicle seat are illustrated. 2 and 3, all the stitches shown in each figure are stitches having the same loop length, but each stitch shown in the center of the paper surface is shown for easy understanding of the positional relationship between the stitches. The stitches shown in bold lines are shown in fine lines on the upper and lower ends of the drawing.

A vehicle seat 2 in FIG. 1 includes a seat cushion 4 and a seat back 6. Each of these seat components includes a seat frame (4F, 6F) (not shown) that forms a seat skeleton, a seat pad (4P, 6P) (not shown) that elastically supports an occupant, and a seat cover (described later) that covers the seat pad. (4S, 6S). Here, each of the seat frames 4F and 6F (not shown) is configured by a metal frame that is typically substantially rectangular or arched. Each of the seat pads 4P and 6P (not shown) is a member having a sheet outer shape, and can be formed of a foamed resin such as polyurethane foam (density: 10 kg / m ^{3 to} 60 kg / m ³ ).

  And the lower part of the seat back 6 is connected with the rear part of the seat cushion 4 so that raising / lowering is possible. In addition, a headrest 8 is integrally provided on the upper portion of the seatback 6, and the headrest 8 is configured such that the center of the seatback 6 in the seat width direction protrudes upward. A pair of hole portions H is provided between the seat back 6 and the headrest 8 from the viewpoint of improving design properties, and the pair of hole portions H are arranged in parallel in the seat width direction.

  Here, the upper surface of the seat cushion 4 can be divided into a top plate main portion 4a and a pair of top plate side portions 4b. The top plate main portion 4a is a central portion of the seat cushion 4 in the seat width direction, and extends in the seat front-rear direction with a width dimension adapted to a passenger with a general physique. In addition, on the left and right sides of the top plate main portion 4a, a top plate side portion 4b that protrudes upward from the top plate main portion 4a is provided. Sometimes it can support the passenger side.

  The front of the seat back 6 can also be divided into a top plate main portion 6a and a pair of top plate side portions 6b. The top plate main portion 6a is a central portion of the seat back 6 in the seat width direction, and extends in the front-rear direction of the seat with an appropriate width dimension. In addition, on the left and right sides of the top plate main portion 6a, a top plate side portion 6b protruding forward from the top plate main portion 6a is provided. Sometimes it can support the passenger side.

[Seat Cover]
Each of the seat covers 4S and 6S is a face material that constitutes the design surface of the sheet, and can be constituted by stitching a plurality of skin pieces as the face material, and is constituted by a single face material. You can also. For example, the seat cover 4S that covers the upper surface of the seat cushion 4 is formed by sewing the first skin piece SP1 to the third skin piece SP3. The first skin piece SP1 is a skin piece that covers the top plate main portion 4a, and is composed of a single knitted fabric that will be described later. The second skin piece SP2 and the third skin piece SP3 are skin pieces that cover the left and right top plate side portions 4b, and are each formed of a single knitted fabric. Moreover, the seat cover 6S part which covers the front of the seat back 6 is comprised by the knitted fabric of the single piece mentioned later, and is arrange | positioned ranging over the top-plate main part 6a and the top-plate side part 6b. In addition, in each seat cover 4S, 6S, the part which is not illustrated or the part which is not attached | subjected can be suitably comprised with various face materials, such as a fabric (woven fabric, knitted fabric, nonwoven fabric), and leather.

  In the present embodiment, the elongation characteristics of the seat covers 4S and 6S are partially different from the viewpoint of improving seating performance of the seat. That is, as will be described later, the sheet covers 4S and 6S are made easier to extend gradually in the direction in which the white arrows D1 and D2 shown in FIG. In this type of seat configuration, it is desirable to make the stretch characteristics of the seat covers 4S and 6S different from each other with good performance (as much as possible) by avoiding an extreme difference in stretchability as much as possible. Therefore, in the present embodiment, the stretch characteristics of the seat covers 4S and 6S are made different with high performance by the configuration described later (high extension portions 10D and 10U, gradation portions 20D and 20U, low extension portions 30S and 30U, etc.). . Hereinafter, these configurations will be described in detail in the order of the seat cover 4S of the seat cushion 4 and the seat cover 6S of the seat back 6. In addition, since the basic formation method of each seat cover 4S and 6S is the same, the formation method is demonstrated to the sheet cover 4S as an example.

[High extension of seat cushion]
In the seat cushion 4, referring to FIG. 1, a first skin piece SP1 covering the top plate main portion 4a is provided with a lower high extension portion 10D and a lower gradation portion 20D described later. The lower high extension portion 10D is a substantially rectangular portion that is most easily extended in the front-rear direction of the seat in the first skin piece SP1, and is disposed in a seat cover portion where a leg portion (for example, a calf) of a seated passenger abuts. . That is, the lower high extension portion 10D is arranged so as to cover the entire front end width of the top plate main portion 4a, and extends in the left-right direction with a gentle curve following the front end shape of the top plate main portion 4a. . Note that the size of the lower high extension portion 10D in the front-rear direction of the seat can be set to be substantially the same across the entire width of the top plate main portion 4a, and can be set to gradually decrease toward the center.

[Gradation of seat cushion]
Further, the lower gradation portion 20D is a portion where the extensibility varies stepwise, and is provided in the first skin piece SP1 portion excluding the lower high extension portion 10D. The lower gradation portion 20D is divided into a first lower gradation portion 21D, a second lower gradation portion 22D, a third lower gradation portion 23D, and a fourth lower gradation portion 24D in the longitudinal direction of the sheet. Further, referring to the arrow D1 in FIG. 1, the fourth lower gradation portion 24D to the first lower gradation portion 21D are sequentially arranged in this order toward the lower high extension portion 10D and extend in the longitudinal direction of the seat. It has been made easier. In addition, although the dimension in the seat front-back direction of each lower gradation part 21D-24D is not specifically limited, It can set suitably with the dimension of the top plate main part 4a, and the dimension of the passenger | crew's part to contact | abut.

  The first lower gradation portion 21D is a substantially rectangular portion provided adjacent to the rear side of the lower high extension portion 10D, and is easily extended next to the lower high extension portion 10D. The first lower gradation portion 21D extends in the left-right direction with a gentle curve following the lower high extension portion 10D. The second lower gradation portion 22D is a substantially rectangular portion provided adjacent to the rear side of the first lower gradation portion 21D, and is easily extended next to the first lower gradation portion 21D. The second lower gradation portion 22D extends in the left-right direction with a gentle curve following the first lower gradation portion 21D. The third lower gradation portion 23D is a substantially rectangular portion provided adjacent to the rear side of the second lower gradation portion 22D, and is easily extended next to the second lower gradation portion 22D. The front side of the third lower gradation part 23D extends in the left-right direction along a gentle curve following the first lower gradation part 21D, and the rear side of the third lower gradation part 23D It extends substantially linearly in the width direction. The fourth lower gradation portion 24D is a portion provided adjacent to the rear side of the third lower gradation portion 23D, and is most difficult to expand in the first skin piece SP1. The fourth lower gradation portion 24D is provided at the rear end portion of the top plate main portion 4a, and is disposed in the seat cover portion where the seated passenger's buttocks abut.

  Further, the first skin piece SP1 and the second skin piece SP2 covering each top plate side part 4b are respectively provided with a side high extension part 10S, a side low extension part 30S, and a fourth side gradation part 24S. Is provided. These parts (parts) 10S, 30S, 24S have substantially the same basic configuration in the left and right skin pieces SP2, SP3. For example, the second skin piece SP2 covering the right top plate side portion 4b will be described as an example. The side high stretch portion 10S is a portion having the same stretch characteristics as the above-described lower high stretch portion 10D. It is provided at the left end adjacent to the first skin piece SP1 of the main portion 4a and extends in the seat front-rear direction. When a relatively large occupant is seated, the side high extension portion 10S disposed on the top plate side portion 4b extends moderately to support the occupant. The fourth side gradation portion 24S is a portion having the same elongation characteristic as the above-described fourth lower gradation portion 24D. The fourth side gradation portion 24S is provided at the left end behind the side high extension portion 10S and adjacent to the top plate main portion 4a. The left and right fourth side gradation portions 24S are arranged so as to surround the third lower gradation portion 23D and the fourth lower gradation portion 24D provided in the first skin piece SP1 from both the left and right sides.

[Low extension of seat cushion]
The side low extension portion 30S is a substantially rectangular portion that is long in the front and rear and provided on the outside (the right side in the second skin piece SP2 and the left side in the third skin piece SP3) of the side high extension portion 10S and the like. It is. The side low extension part 30S is a part that is inferior to the above-described fourth side gradation part 24S and side high extension part 10S, and is most difficult to extend in the seat front-rear direction in the seat cover 4S. Yes. In the present embodiment, the left and right side low extension portions 30S are arranged over substantially the entire length of the top plate side portion 4b near the top of the corresponding top plate side portion 4b.

[Formation work of skin piece (knitted fabric)]
With reference to FIG.2 and FIG.3, the knitted fabric as each skin piece SP1-SP3 is formed, for example using a flat knitting machine. The knitted fabric may be either a warp knitting or a weft knitting. Here, examples of the weft knitting include a basic structure (flat knitting, rubber knitting, pearl knitting) and its changing structure. Examples of warp knitting include a basic organization (Denby knitting, code knitting, atlas knitting, chain knitting) and its changing organization. And in the seat cover 4S of this embodiment, the part (site | part) corresponding to each skin piece SP1-SP3 can be formed with the same method. Therefore, in the following, a method for forming each of these parts will be described in detail by taking the side low extension part 30S of the top board side part 4b, the lower high extension part 10D and the lower gradation part 20D of the top board main part 4a as examples.

[Yarn material]
Here, in the seat cover 4S, at least one piece of the respective skin pieces SP1 to SP3 can be formed of the same type of thread material Y1. For example, the first skin piece SP1 is formed of the same type of thread material Y1. By doing so, the lower high extension portion 10D and the lower gradation portion 20D exhibit a similar appearance, and the design of the top plate main portion 4a can be improved, for example, the first skin piece SP1 looks plain. Then, a good-looking pattern can be imparted to the plain first skin piece SP1 by a printing process or the like. Further, by forming the second skin piece SP2 and the third skin piece SP3 with the thread material Y1 made of the same material as that of the first skin piece SP1, the substantially entire upper surface of the seat cushion 4 has a similar appearance. Examples of the material of the yarn material Y1 include plant-based and animal-based natural fibers, chemical fibers made of a thermoplastic resin or a thermosetting resin, and mixed yarns thereof. As the yarn material Y1, various yarn materials such as spun yarn, filament, drawn yarn, bulky processed yarn material (Mole yarn, Taslan processed yarn, false twisted yarn, covering yarn, etc.) can be used. Further, the yarn material Y1 can be subjected to a raising process and a fluffing process to improve the holdability for the occupant.

[Formation work of low extension part]
Referring to FIG. 2, the knitted fabric of the side low stretch portion 30S is formed by a stitch RF formed by a loop of a yarn material Y1 having a predetermined loop length LF. In the side low stretch portion 30S, the stitch RF forming the knitted fabric is set to the shortest loop length among the other portions, and is the least stretched in the seat cover 4S. The number of stitches per stitch area (number of stitches) in the course direction X or the wale direction Y in the side low extension portion 30S is not particularly limited as long as the strength as the seat cover 4S can be secured.

[Formation work of high extension part]
Referring to FIG. 3, the knitted fabric of the lower high stretch portion 10D is formed by a large stitch RA formed by a loop of a yarn material Y1 having a loop length LA (LA> LF). The large stitch RA has a configuration corresponding to the other stitch of the present invention, and is formed by a loop of the yarn material Y1 that is longer than the stitch RF corresponding to the stitch of the present invention and each of the medium stitches RB to RE described later. ing. That is, the large stitch RA that forms the lower high extension portion 10D is set to the longest loop length among the other portions, and is most easily extended in the seat cover 4S. Note that the knitted fabric of the lower high stretch portion 10D is all formed of the large stitch RA, but may have other stitches that are fewer than other portions. Further, the number of eyes per predetermined area in the course direction X or the wale direction Y in the lower high extension portion 10D is not particularly limited.

[Formation work of gradation part]
In the lower gradation portion 20D, the knitted fabrics of the gradation portions 21D to 24D can be formed with middle stitches (first middle stitch RB to fourth middle stitch RE) having different loop lengths with reference to FIG. That is, the knitted fabric of the first lower gradation portion 21D is formed by the first medium stitch RB formed by the loop of the yarn material Y1 having the loop length LB (LB <LA). The knitted fabric of the second lower gradation portion 22D is formed by the second medium stitch RC formed by the loop of the yarn material Y1 having the loop length LC (LC <LB). Further, the knitted fabric of the third lower gradation portion 23D is formed by the third stitch RD formed by the loop of the yarn material Y1 having the loop length LD (LD <LC). Then, the knitted fabric of the fourth lower gradation portion 24D is formed by the fourth middle stitch RE formed by the loop of the yarn material Y1 having the loop length LE (LF <LE <LD). In this way, the knitted fabric constituting the fourth lower gradation portion 24D to the first lower gradation portion 21D is composed of the middle stitch having a long loop length in this order, and is made easier to extend sequentially. The number of eyes per predetermined area in the course direction or the wale direction in the lower gradation portion 20D is not particularly limited.

[Attaching the seat cover]
Then, a seat cover 4S is formed from each of the above-described skin pieces SP1 to SP3, and this seat cover 4S is attached to a seat pad 4P (not shown). Here, the attachment method of the seat cover is not particularly limited. For example, the seat cover 4S is disposed in advance in the cavity of the seat pad mold. At this time, the seat cover 4S has a lower high extension portion 10D and a lower gradation portion 20D that are relatively easily extended. For this reason, the seat cover 4S can be smoothly aligned at an appropriate position in the cavity while changing the shape by appropriately extending the lower high extension portion 10D and the lower gradation portion 20D. Next, by foaming and curing the molding material in the cavity, the seat cover 4P can be molded and at the same time, the seat cover 4S can be integrally attached to the seat pad 4P. And according to this embodiment, since it is not necessary to change the position of the seat cover 4S forcibly and align it, it is possible to preferably avoid occurrence of appearance defects such as wrinkles in the seat cover 4S.

[Use of seat cushion]
Referring to FIG. 1, when an occupant sits on seat cushion 4, the occupant's heel strongly presses the rear side of top plate main portion 4 a. In the present embodiment, since the seat cover 4S has appropriate elongation characteristics for each part, the seat pressure is optimally distributed in a concave shape that matches the curve of the occupant body, and a fit that wraps the entire occupant, High holdability to hold the shoulder and waist can be ensured from the gravitational acceleration during turning. For example, since the fourth lower gradation portion 24D and the like covering the rear side of the top plate main portion 4a have appropriate extensibility, the occupant's buttocks are appropriately submerged in the seat cover 4S. By fitting the seat cover 4S so as to wrap the occupant's buttocks, unintentional movement such as forward sliding of the occupant's buttocks can be suitably avoided. An occupant leg (for example, a calf) comes into contact with the lower high extension portion 10D that covers the front end of the top plate main portion 4a. At this time, since the lower high extension portion 10D is most easily extended, it is possible to operate the accelerator, the brake, and the clutch by smoothly moving the occupant legs to the left and right, and the operability of the vehicle can be improved. Further, the portion from the occupant's buttocks to the occupant's legs is supported by the lower gradation portion 20D. In the lower gradation portion 20D, with reference to the arrow D1 in FIG. 1, the lower gradation portion 20D is easily extended stepwise as it approaches the lower high extension portion 10D. For this reason, the lower gradation portion 20D makes it possible to have a configuration in which the difference in stretchability at the boundary of the lower high stretch portion 10D that is most easily stretched is sensibly ambiguous and the occupant is not as uncomfortable as possible. Furthermore, in the present embodiment, the physique difference of the occupant can be absorbed by the side high extension part 10S of the top plate side part 4b, and the occupant's waist during turning can be firmly supported by the side low extension part 30S. .

[High extension of seat back]
Next, in the seat back 6, referring to FIG. 1, a seat cover portion in which the upper high extension portion 10 </ b> U is provided at the center upper portion when viewed in the seat width direction, and the seat back and the head of the seat are in contact with each other. Is arranged. The upper high extension portion 10U is the portion that is most easily extended in the seat vertical direction in the seat cover 6S, has the same extension characteristics as the lower high extension portion 10D, and can be formed by the same method as the lower high extension portion 10D. . The upper high extension portion 10U has a substantially rectangular shape that is long in the vertical direction of the seat when viewed from the front, and extends from the center in the vertical direction of the seat back 6 to the upper end of the headrest 8 beyond the pair of holes H. . The width dimension in the left-right direction of the upper high extension portion 10U is gradually widened from the lower side to the upper side, and further narrowed by being tightened in front of the pair of holes H. Then, the scapula of the seated occupant comes into contact with the upper portion of the upper high extension portion 10U that protrudes to the left and right. Further, the width dimension of the upper high extension portion 10U in the headrest 8 portion is set to a dimension capable of supporting the occupant's head when seated, and is slightly narrower than the upper high extension portion 10U of the seat back 6. .

[Gradation part of seat back]
An upper gradation portion 20U is provided adjacent to the lower side of the upper high extension portion 10U. The upper gradation portion 20U is a substantially inverted trapezoidal portion connected to the upper high extension portion 10U, and is divided into a first upper gradation portion 21U and a second upper gradation portion 22U in the sheet vertical direction. Further, referring to the arrow D2 in FIG. 1, the second upper gradation portion 22U and the first upper gradation portion 21U are sequentially arranged in this order toward the upper high extension portion 10U and extend in the vertical direction of the sheet. It has been made easier.

  The respective portions 21U and 22U of the upper gradation portion 20U have the same elongation characteristics as the corresponding portions 21D and 22D of the lower gradation portion 20D and can be formed by the same method as the corresponding portions. The first upper gradation portion 21U is a substantially rectangular portion provided adjacent to the upper high extension portion 10U, and is easily extended next to the upper high extension portion 10U. The first upper gradation portion 21U extends in the left-right direction with an upward convex gentle curve. The second upper gradation portion 22U is a substantially rectangular portion provided adjacent to the first upper gradation portion 21U, and is easily extended next to the first upper gradation portion 21U. The second upper gradation portion 22U is shorter in the horizontal direction than the first upper gradation portion 21U.

[Low extension of seat back]
The seat cover 6S can be provided with an upper low extension portion 30U at a portion excluding the upper high extension portion 10U and the upper gradation portion 20U. The upper low extension portion 30U is the portion of the seat cover 6S that hardly stretches in the vertical direction of the seat, has the same elongation characteristics as the side low extension portion 30S, and is the same as the side low extension portion 30S. It can be formed by a technique. The upper low extension portion 30U of the present embodiment is provided so as to slightly protrude from the left and right top plate side portions 6b to the top plate main portion 6a side. Further, a part of the upper low extension portion 30U is provided so as to cross the lower portion of the top plate main portion 6a, and is disposed at a position where it can face the pelvis of the occupant. A part of the upper low extension portion 30U is disposed below the upper gradation portion 20U, and extends to the left and right in a downwardly convex gentle curve. Further, in the present embodiment, a third upper gradation portion 23U is formed below a part of the upper low extension portion 30U. The third upper gradation portion 23U is a portion having the same elongation characteristics as the third lower gradation portion 23D, and can be formed by the same method as the third lower gradation portion 23D. The third upper gradation portion 23U is formed up to the lower end of the seat cover 6S and is disposed adjacent to the fourth lower gradation portion 24D on the seat cushion 4 side.

[Use of seat back]
Referring to FIG. 1, when the occupant falls over the seat back 6, the occupant back part comes into contact with the upper center of the top plate main part 6 a. At this time, the upper high extension portion 10U covering the center upper portion of the top plate main portion 6a is appropriately extended to fit the occupant, so that the seat configuration is excellent in seating property. In addition, the upper portion of the upper high extension portion 10U that protrudes to the left and right will be extended moderately to support the scapula of the occupant. Moreover, the lower part of the top plate main part 6a is strongly pressed by a passenger | crew's pelvis. At this time, the support performance for the occupant is improved by firmly receiving the pelvic pressure of the occupant by a part of the upper low extension portion 30U arranged so as to cross the lower part of the top plate main portion 6a. Furthermore, the passenger | crew shoulder part at the time of turning can be firmly supported by the upper low expansion | extension part 30U part of the top-plate side part 6b. Also in the seat back 6, the portion from the pelvis of the occupant to the back of the occupant is supported by the upper gradation portion 20U. Also in the upper gradation portion 20U, with reference to the arrow D2 in FIG. 1, the upper gradation portion 20U is easily extended stepwise as it approaches the upper high extension portion 30U. For this reason, the upper gradation portion 20U makes the boundary of the upper high-extension portion 10U that is most easily stretched sensibly ambiguous, so that the occupant can be made as uncomfortable as possible.

  As described above, in the present embodiment, the gradation portions 20D and 20U make the difference in stretchability between the high stretch portions 10D and 10U that are relatively easy to stretch as vague as much as possible. It can be set as the structure which does not remember discomfort as much as possible. Further, the stretchability of the high stretch portions 10D and 10U and the gradation portions 20D and 20U is different depending on the loop length of the stitches constituting the knitted fabric as the seat covers 4S and 6S. For this reason, the knitted fabric constituting each of the seat covers 4S and 6S can have a simple configuration in which it is not necessary to extremely change the knitting method and the constituent yarn for each part. Further, since each of the high extension portions 10D and 10U and each of the gradation portions 20D and 20U are made of the same thread material, the design properties can be improved, for example, by giving these portions a similar appearance. In the seat back 6, the upper gradation portion 20U makes the difference in stretchability between the upper high stretch portion 10U that is relatively easy to stretch and the low stretch portion 30U that is relatively difficult to stretch as much as possible, It can be set as the structure which does not make a passenger feel uncomfortable as much as possible. For this reason, according to this embodiment, the extensibility of each seat cover 4S and 6S can be partially changed with sufficient performance.

[Test example]
Hereinafter, although this embodiment is described based on a test example, the present invention is not limited to the test example. Details of each part (each part) provided on the knitted fabric as the seat cover are shown in [Table 1] described later. In addition, the name of each part (each part) of the knitted fabric is determined on the assumption that it is used for the seat cover of the seat cushion shown in FIG.

[Example]
In this example, using a flat knitting machine (model SWG091N ₂ (15 gauge type) manufactured by Shima Seiki Co., Ltd.), a flat knitted fabric (deformed rib knitting) as a seat cover was prepared. Moreover, as a knitted yarn material, a Mole yarn (manufactured by Toray Industries, count: 1 / 12.5) was used. In the side low stretch portion, the number of meshes in the wale direction was set to 39 / inch, the number of meshes in the course direction was set to 18 / inch, and the loop portion was formed of a thread material loop of 3.68 mm. A knitted fabric was formed by the stitches.

  In the lower high extension portion and the lower gradation portion, the number of eyes in the course direction was uniformly set to 17 eyes / inch. In the lower high stretch portion, the number of stitches in the wale direction was set to 21 stitches / inch, and a knitted fabric was formed by large stitches formed by a loop of yarn material having a loop length of 4.85 mm. In the first lower gradation portion, the number of stitches in the wale direction was set to 24 stitches / inch, and a knitted fabric was formed by middle stitches formed by loops of a thread material having a loop length of 4.69 mm. In the second lower gradation portion, the number of stitches in the wale direction was set to 26 stitches / inch, and the knitted fabric was formed by middle stitches formed by loops of yarn material having a loop length of 4.53 mm. In the third lower gradation portion, the number of stitches in the wale direction was set to 28 stitches / inch, and a knitted fabric was formed by medium stitches formed by loops of a thread material having a loop length of 4.36 mm. In the fourth lower gradation portion, the number of stitches in the wale direction was set to 29 stitches / inch, and a knitted fabric was formed by medium stitches formed by loops of a thread material having a loop length of 4.29 mm.

[Evaluation method of constant load elongation]
In the measurement of the constant load elongation, the knitted product was cut into a size of 80 mm in width and 250 mm in length to obtain a test piece. Marks at intervals of 100 mm were marked at the center in the length direction of each test piece. The upper end of the test piece was clamped with a fixed fastener, and a weight of 10 kg including this fastener was attached to the lower end of the test piece via another unfixed fastener and suspended. At this time, the distance between the chucks of the upper fastener and the lower fastener was 160 mm. With the weight suspended from the test piece, leave it for 10 minutes, and after 10 minutes with the weight suspended, measure the distance (L1) between the gauge points with a vernier caliper and substitute it into the following formula (1) for constant load. The elongation was calculated. In the state where the lower high extension part, lower gradation part and side low extension part are attached to the vehicle seat, the vertical direction in the following [Table 1] corresponds to the front and rear direction of the seat cushion shown in FIG. The horizontal direction corresponds to the left-right direction of the seat cushion.
Formula (1): Constant load elongation rate (%) = (L1-100) / 100 × 100 (L1 in the formula: interval between gauge points (mm) 10 minutes after adding a weight)

[Results and discussion]
With reference to [Table 1], in this embodiment, the lower high extension portion, the lower gradation portion, and the side low extension portion are reduced in this order, and the constant load elongation rate in the vertical direction becomes lower and is not easily extended. It was confirmed that In the lower gradation part, the constant load elongation rate in the vertical direction is stepped in the order of the first lower gradation part, the second lower gradation part, the third lower gradation part, and the fourth lower gradation part. Could be lowered. When the examiner is seated using the vehicle seat in the state shown in FIG. 1, it is not possible to feel a portion where the difference in stretchability is extremely large between the lower high extension portion and the lower gradation portion. It was. For this reason, according to the present invention, it was found that the stretchability of the seat cover can be partially changed with good performance by providing the lower high extension portion and the lower gradation portion adjacent to each other.

  The seat cover of the vehicle seat of the present embodiment is not limited to the above-described embodiment, and can take other various embodiments. In the present embodiment, the configuration (shape and size (formation range), number of formations, formation position, constituent yarn, etc.) of each high stretch portion, each gradation portion, and each low stretch portion is illustrated, but the configuration of each of these portions is limited. It is not the purpose. For example, the entire circumference of the high extension portion can be surrounded by a gradation portion. The gradation portion can be configured to change the extensibility continuously in addition to the configuration that changes the extensibility stepwise. For example, the extensibility of the gradation part can be continuously changed by changing the loop length for each course direction. In the configuration in which the extensibility is changed stepwise, it is desirable to form two or more gradation parts having different extensibility, and the difference in extensibility between adjacent parts can be appropriately changed. Moreover, each part (each part) can also be comprised with the thread material of a different raw material. Further, at least a high extension portion and a gradation portion can be formed on the face material, and the low extension portion can be omitted as appropriate.

  The high extension portion may be a portion that is most easily extended in the seat cover, or may be a portion that is easily extended as compared to a specific seat cover portion. Similarly, the low extension portion may be a portion that is most difficult to extend in the seat cover, or may be a portion that is difficult to extend compared to a specific seat cover portion. The gradation part is gradually extended as it approaches the high extension part, and conversely, the gradation part gradually becomes difficult to extend as it approaches the low extension part. Further, the gradation portion can be formed between the high extension portion and the intermediate extension portion. In this case, the intermediate extension portion is relatively difficult to extend, and can be regarded as the low extension portion of the present invention. Similarly, the gradation portion can be formed between the low extension portion and the middle extension portion. In this case, the middle extension portion can be regarded as the high extension portion of the present invention because it is relatively easy to extend. .

  In the present embodiment, the configuration of the seat cover (shape, size, number of skin pieces, constituent yarns, etc.) is exemplified, but the configuration of each seat cover is not limited. For example, the seat cover of the seat cushion can be formed of a single face material, and the seat cover of the seat back can be formed by stitching a plurality of skin pieces. It is also possible to cover both the seat cushion and the seat back with a single seat cover. In this case, the seat cover can be composed of a single face material, and a plurality of skin pieces can be stitched together. But it can be formed. In addition to the knitted fabric, various face materials (woven fabric, non-woven fabric, etc.) capable of producing a difference in stretchability can be used as the seat cover. In this embodiment, the seat cushion has a difference in extensibility in the front-rear direction of the seat, but a difference in extensibility in the left-right direction of the seat can also be provided. Similarly, in the seat back, a difference is provided in the extensibility in the vertical direction of the seat, but a difference in the extensibility in the horizontal direction of the seat can also be provided.

  Further, in the present embodiment, an example in which the knitted fabric of each part is formed with one type of stitch (any one of RA to RE) has been described. Each of these high stretch portions, each gradation portion, and each low stretch portion may have both stitches (RF or RB to RE) and other stitches (RA). The extension portion has more other stitches than each gradation portion and each low extension portion, and is easily extended. That is, the extensibility of each part (each part) means the extensibility when viewed as the entire knitted fabric. In the gradation portion, the stretchability may be changed stepwise at a plurality of gradation portions as in this embodiment, or the stretchability can be changed continuously. In addition, the low expansion portion and the gradation portion can be provided adjacent to each other, and the gradation portion can be gradually expanded as the distance from the low expansion portion increases.

  In the present embodiment, the seat cushion 4 and the seat back 6 (headrest 8) have been described as examples. However, the configuration of the present embodiment can be applied to seat covers of various seat components such as armrests. The configuration of the vehicle seat can also be changed as appropriate, and for example, the seat back and the headrest can be configured separately. In addition, the configuration of the present embodiment can be applied to all vehicle seats for vehicles, aircraft, trains, and the like.

2 Vehicle seat 4 Seat cushion 4S Seat cover 4a Top plate main portion 4b Top plate side portion 10D Lower high extension portion of the top plate main portion (high extension portion of the present invention)
Lower gradation part of 20D top plate main part (gradation part of the present invention)
21D First lower gradation part 22D Second lower gradation part 23D Third lower gradation part 24D Fourth lower gradation part 10S Side high extension part 24S Fourth side gradation part 30S Side low extension part 6 Sheet Back 8 Headrest 6S Seat cover 6a Top plate main portion 6b Top plate side portion 10U Upper high extension portion (high extension portion of the present invention)
20U Upper gradation part (gradation part of the present invention)
21U First upper gradation region 22U Second upper gradation region 23U Third upper gradation region 30U Upper low extension portion RA Large stitch (other stitches of the present invention)
RB ~ RE Medium stitch (the stitch of the present invention)
RF stitch (the stitch of the present invention)
SP1 to SP3 First skin piece Y1 Thread material

Claims (4)

In the seat cover of a vehicle seat composed of an extensible face material,
A seat cover for a vehicle seat, wherein the seat cover is provided with a high stretch portion that is easily stretched and a gradation portion that is gradually stretched as it approaches the high stretch portion. At least a part of the seat cover is composed of a knitted fabric as the face material provided with the high extension portion and the gradation portion,
The knitted fabric has a stitch formed by a loop of yarn material having a predetermined length, and another stitch formed by a loop of yarn material longer than the stitch, and the high stretch portion is The seat cover for a vehicle seat according to claim 1, wherein the seat cover has a larger number of other stitches than the gradation portion and is easily stretched.   The seat cover for a vehicle seat according to claim 1 or 2, wherein the high extension portion and the gradation portion are made of a thread material made of the same material. The seat cover is provided with a low stretch portion that is less likely to stretch than the high stretch portion and the gradation portion, and the gradation portion is disposed between the high stretch portion and the low stretch portion. The seat cover of the vehicle seat according to any one of claims 1 to 3.

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