JP3472732B2 - Chair cushion sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a chair such as automobile seat
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a cushion sheet for a chair, which is used as a chair for a chair.

[0002]

2. Description of the Related Art As a cushion seat material for a chair,
In addition to having a moderate cushioning property in the thickness direction and excellent morphological stability, it has good breathability and body pressure dispersibility as much as possible, and has a moderate slip resistance to the seated person on the surface, It is required that the user does not get tired easily even by sitting down for hours.

Conventionally, a three-dimensional double knitted fabric has already been proposed as a cushioning sheet material for meeting such demands. That is, there has been proposed a three-dimensional three-dimensional knitted fabric in which a front knitted fabric and a back knitted fabric, which are knitted in a mesh structure, are connected by connecting yarns by a double Russell knitting machine having a two-row needle bed. Examples of such proposals can be found in sheet materials such as Examples 1 and 5 described in Japanese Patent No. 2720985.

[0004]

However, the cushion sheet material made of the three-dimensional double knitted fabric, which is manufactured based on the conventional proposal, has the ground structure of the front and back knitted fabrics by the double-raschel knitting machine of 22 gauge or 24 gauge. The knitting yarn to be formed was knitted into a three-dimensional three-dimensional knitted fabric by using a relatively thin (thin) multifilament having a fineness of about 150 denier.

Therefore, the so-called waist is generally weak, and when a buckling force due to sitting is applied, it tends to sink excessively,
In addition, the buckling of the connecting yarn in a certain direction tends to occur, and the buttocks of the seated person are slippery on the surface side, which is poor in seating stability and feeling of use, and it is easy to feel fatigue and pain after long-term use. There were various difficulties to be improved.

[0006]

Under these circumstances, the present inventors have earnestly studied for a concrete structure most suitable as a cushion sheet material for a chair, and as a result, particularly knitted fabrics on the front and back surfaces. By setting the fineness of the ground knitting yarn and the connecting yarn constituting the knitting density, the knitting density in the wale direction and the course direction, the arrangement configuration of the connecting yarn and its distribution density, etc. within a predetermined range,
The present invention has been completed by finding that an optimum three-dimensional knitted fabric for a cushion sheet for a chair is obtained.

That is, the three-dimensional three-dimensional sheet suitable for the chair cushion sheet according to the present invention has a thickness of 3 to 35 in which the front knitted fabric and the back knitted fabric which are arranged apart from each other are connected by the connecting yarn.
mm three-dimensional knitted fabric, the three-dimensional knitted fabric is 6 to 1
A knitting machine having a 6-gauge double-row needle bed is knitted to have a density of 8 to 16 courses / inch, at least the surface knitted fabric is knitted into a through-hole structure such as a mesh or tricot, and the connecting yarn is a monofilament. A yarn, and one or more wales and / or
Alternatively, a connecting layer having a truss structure is formed by diagonally crossing and moving toward a stitch separated by one or a plurality of courses, and in both front and back knitted fabrics, a total of yarns of the stitches formed by the ground knitting yarn and the connecting yarn. The thickness is set to 500 denier or more, and the filling index P calculated by the following formula is 0.0
It is characterized in that it is set in the range of 03 <P <0.09.

Filling index P = (t × N × D) / (9000
× 10 ² × ρ × T) [t: Inner dimension distance (cm) between two front and back knitted fabrics, N: Number of connecting yarns (pieces / cm ² ), D: Average denier calculated from diameter of connecting yarn, ρ: average specific gravity of connecting yarn (g / cm ³ ),
T: Unit volume of knitted fabric (cm ³ )] The three-dimensional three-dimensional sheet according to the present invention is a three-dimensional knitted fabric having a thickness of 3 to 35 mm in which front and back knitted fabrics are connected by connecting yarns, and thus is lightweight and excellent in breathability, Not only is it excellent in cushioning properties, but it is also 8
By adopting a relatively coarse knitting density of ~ 16 courses / inch, the total thickness of the yarns of the stitches formed by the base knitting yarns of the front and back knitting fabrics and the connecting yarns is set to 500 denier or more. The connecting portion between the ground and the connecting yarn has excellent connecting strength. That is, the stitching force of the stitch at the connecting portion of the connecting yarn is improved, the morphological stability is improved, good cushion characteristics are exhibited, and the body pressure dispersibility is excellent. In addition, since the stitches formed by the base knitting yarn and the connecting yarn of the front and back knitted fabric are composed of sufficiently thick yarns,
A bulge-like ridge is formed in the wale direction to prevent excessive slippage of the buttocks on the surface side. Therefore, the feeling of sitting and using is excellent, and the user is less likely to get tired when sitting and using for a long time.

Further, since a monofilament is used as the connecting yarn and a connecting layer having a truss structure in which the connecting yarn is obliquely cross-migrated between the front and back knitted fabrics, uneven buckling due to the falling of the connecting yarn occurs. It has no cushion and has excellent cushioning and resilience with no directionality.

Furthermore, by setting the filling index P that defines the substantial arrangement density of the connecting yarns in the above-mentioned specific range, the cushioning property and the compression hardness are maintained, and the restoring force is excellent and the touch is good. It has a good feeling.

In order to obtain a cushioning property in a suitable range which is excellent in versatility as a cushioning sheet material for chairs, it is desirable to use a monofilament in the range of 250 to 1000 denier as the connecting yarn.

Further, the front and back knitted fabrics are knitted into different kinds of through-hole structures so that the form and characteristics of the use surface can be changed and used according to the preference of the user. Is recommended. For example, the front knitted fabric may have a mesh mesh structure of a hexagonal mesh, and the back knitted fabric may have a square or rhombic mesh structure formed by a double tricot or marquisette, which is preferably employed as one of the embodiments.

The present invention also provides a cushion seat for a chair which is laid and used in a seat of an automobile or the like.

The cushion sheet for a chair to be laid down uses the above-mentioned three-dimensional seat, and at least the seat portion is formed by arranging the front and back knitted fabrics of the seat in the wale direction in the left-right width direction. It is characterized by that.

By adopting this structure, when the user is sitting, the buttocks of the seated person are unlikely to slip in the front-rear direction, but on the other hand, the buttocks are relatively easy to slip in the left-right direction. This is ergonomically well matched to the movement of the seated person in the seated state.

In addition, in response to the fact that many chairs, including automobile seats, have a backrest in which the backrest rises from the rear end of the seat, the above-mentioned three-dimensional three-dimensional cushion sheet is used. It is desirable to have a seat sheet portion and a backrest sheet portion that are formed of a seat, and these both seat portions be foldably connected at at least a part of corresponding sides.

Further, in order to make the seat for automobiles excellent in laying stability by being laid down, the seat sheet portion has a tongue piece for inserting backwardly in an intermediate portion of its rear side. It is preferable that both sides of the tongue piece are connected to corresponding lower sides of the backrest sheet portion.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a three-dimensional sheet according to the present invention is shown in FIGS.

The three-dimensional three-dimensional sheet (1) has a mesh structure having a large number of through holes (5) and (6) of a mesh structure or the like in a regular arrangement, that is, a surface knitted fabric (2) having a through hole structure. The back knitted fabric (3) and the back knitted fabric (3) are arranged at a predetermined distance from each other, and these two knitted fabrics (2) and (3) are connected by a connecting yarn (4) that reciprocates between the two knitted fabrics. Thickness 3-35
It consists of a three-dimensional three-dimensional knitted fabric of mm. However, the back knitted fabric (3) does not necessarily have to have a perforated structure.

When the thickness is less than 3.0 mm,
It is difficult to provide good cushioning properties as a cushion sheet material, and conversely, when the thickness is more than 35 mm and too thick, the cushioning properties are excellent,
It becomes poor in shape stability and lacks suitability as a cushion sheet material for chairs. The preferred thickness range varies depending on the application, but is generally 5-20.
The range is about mm. In the application as a cushion sheet for a car seat, which will be described later, 10 to 15
It is preferable that the thickness range is about mm.

The above-mentioned three-dimensional knitted fabric is knitted by a knitting machine equipped with a two-row needle bed, most commonly by a double Russell machine. Coarse 6-16 gauge, ie 6 per inch
Using a knitting machine having a needle row of up to 16 and a needle drawing amount (degree) from the needle bed top end by a needle of 1.2
Approximately 3.0 mm, and as a result, it is necessary to knit into a course density of 8 to 16 courses / inch.

When the needle row density is less than 6 gauge or the course density is less than 6 courses / inch, it becomes difficult to knit a knitted fabric having excellent shape stability. If it exceeds 16 gauge or 16 courses / inch,
As will be described later, knitting becomes difficult due to the fact that the yarn thickness of the stitch portion formed by the base knitting yarn and the connecting yarn becomes thicker than 500 denier. Suitably 8 to 1
It is preferable to use a knitting machine of 4 gauge and to adopt knitting conditions of about 8 to 14 courses / inch.

Both the front knitted fabric (2) and the back knitted fabric (3) are preferably knitted into a net having a through-hole structure as described above. As the ground knitting yarn for knitting these front and back knitted fabrics (2) and (3), it is preferable to use a relatively thick multifilament yarn of 250 to 2500 denier or a spun yarn. While this is not necessarily a limiting factor,
When knitting with a fine thread of less than 250 denier, it becomes difficult to make the three-dimensional knitted fabric have a desired desired waist strength, and the hard connecting yarn (4) is used for the front and back knitted fabric (2).
Due to (3), it cannot be restrained sufficiently firmly, and the form stability tends to be poor. However, conversely, when a too thick knitting yarn exceeding 2500 denier is used, the knitting work becomes difficult, and the surface of the knitted fabric becomes inferior in feeling and touch, which is not preferable. Further, although monofilament yarns may be used for these ground knitting yarns, it is preferable to use multifilaments from the viewpoint of feeling and the like.

The ground knitting yarn used for knitting the front and back knitted fabrics (2) and (3) is as described above. In the present invention, at least the ground knitting yarn and the connecting yarn (4) are used in particular. It is necessary to make the total thickness of both yarns of the stitch to be 500 denier or thicker. This is because the necessary stiffness of the waist and morphological stability are imparted to the entire knitted fabric, and the body pressure dispersibility and slip resistance properties are excellent. It is preferably about 800 to 2500 denier.

The connecting yarn (4) is knitted by reciprocating between the respective wales of the front and back knitted fabrics (2) and (3) to maintain a predetermined space between the two knitted fabrics and to have good breathability and cushioning property. Is to hold. Therefore, as the connecting thread (4),
It is necessary to use a monofilament thread, and it is preferable to use one having a thickness of 250 to 1000 denier. The multi-filament cannot give a cushioning property having a good restoring force, and tends to sink excessively when a body pressure load is applied. The same applies when a thin connecting yarn having a denier of less than 250 is used. However, when a thickness of more than 1000 denier is used, it becomes too hard to hold an appropriate cushion, and the weight of the knitted fabric is increased, the cost is increased, and the suitability tends to be lacking.

The connecting layer between the front and back knitted fabrics (2) and (3) formed by the connecting yarn (4) needs to have a truss structure which is already known in this type of double knitted fabric. is there. That is, the connecting yarn (4) is the front and back knitted fabrics (2) (3).
Although it may have a part in which the mutually reciprocal stitches reciprocate substantially at right angles to both knitting grounds, one or a plurality of wales and / or one or a plurality of courses away from the above-mentioned opposing stitches may be used. Therefore, it is important to have a skewed portion that is diagonally crossed and transferred. By forming the connecting layer having such a truss structure, it is possible to prevent eccentric buckling due to tilting of the connecting yarn (4) and to provide excellent restoring force and usability.

Further, the three-dimensional three-dimensional sheet (1) according to the present invention, that is, the three-dimensional knitted fabric, as a whole, has a filling index P calculated by the following formula of 0.003 after satisfying the above-mentioned conditions. It must be set within the range of <P <0.09.

Filling index P = (t × N × D) / (9000
× 10 ² × ρ × T) [t: Inner dimension distance (cm) between two front and back knitted fabrics, N: Number of connecting yarns (pieces / cm ² ), D: Average denier calculated from diameter of connecting yarn, ρ: average specific gravity of connecting yarn (g / cm ³ ),
T: Unit volume of knitted fabric (cm ³ )] The above T (unit volume of knitted fabric) is a unit area of 1 cm ^2.
Is a value obtained by multiplying by the dimension distance t ₂ between the front and back knitted fabrics (1) and (2). That is, T (cm ³ ) = 1 (cm) × 1 (cm) × t ₂ (cm).

If the filling index P is less than 0.003, a proper impact resilience cannot be realized and 0.09
When the value is larger, the impact resilience becomes too strong and the suitability as a cushion material is impaired. The preferable range of the filling index P is approximately 0.004 to 0.020.

The surface knitted fabric (2) in the illustrated preferred embodiment is knitted in a network of hexagonal hexagonal perforations (5) made by intersecting wales called ordinary nets or meshes. On the other hand, the back knitted fabric (3) is knitted in the mesh structure by the diamond-shaped through holes (6) having a relatively small size, although the mesh structure is the same. In this way, the front knitted fabric (2) and the back knitted fabric (3). By adopting different types of through-hole structures, depending on the application or the season of use,
Further, it is advantageous in that the pattern on the front surface side, the sliding property, the feeling, etc. can be changed and used by reversing the front and back according to the preference of the user.

The type of the knitting yarn for knitting the front and back knitted fabrics (2) and (3) is not particularly limited. Examples thereof include synthetic fibers such as polypropylene, polyester, polyamide, polyacrylonitrile, and rayon, regenerated fibers, and natural fibers such as wool, silk, and cotton. The material forming the connecting yarn (4) is not particularly limited, and may be a monofilament. Any of the above materials may be used alone, or some of them may be used in combination. The use of polyester is preferable because it is excellent in recyclability.

The shapes of the yarns constituting the front and back knitted fabrics (2) and (3) and the connecting yarn (4) are not particularly limited,
For example, a round cross-section thread or a modified cross-section thread may be used.

FIG. 3 shows the above-mentioned three-dimensional solid sheet (1).
Fig. 1 shows a specific configuration example of an underlay cushion seat (11) for an automobile seat configured by using.

The cushion seat (11) is a seat portion ( ₁ ) to be overlaid on a seat portion (S ₁ ) of an automobile seat (S).
2) and a backrest seat portion (13) arranged on the front side of the backrest portion (S ₂ ).

Further, the seat sheet portion (12) has a tongue piece (12a) for insertion which extends rearward in the middle portion of the rear side thereof, and a pair of left and right portions are provided on both sides of the tongue piece (12a). Via the connecting pieces (14) and (14), the backrest sheet portion (13) is sewn and connected to the corresponding portion on the lower side of the backrest sheet portion so as to be bendable. Therefore, the insertion tongue (12
seat a) a seat (S) (S ₁₎ and the backrest (S ₂₎
Although not shown, the cord attached to the upper part of the backrest seat portion (13) is forcibly inserted into the backrest portion (S).
_The cushion sheet (11) can be laid stably on the seat (S) by attaching it to the upper part of ₂ ).

By the way, the cushion sheet (11)
The seat sheet portion (12) and the backrest seat portion (13) of
All of them are configured by arranging the knitting direction of the three-dimensional solid sheet (1) in a horizontal direction. That is, the front and back knitted fabrics (2) and (3) are arranged in the left and right width directions in the wale direction. This brings about the following advantages especially as a cushion seat (11) for a chair such as a car seat.

The seating surface of a chair such as an automobile seat is generally designed to have an inclination of about 10 to 14 degrees upward with respect to a horizontal plane. This inclination is ergonomically, and when the buttocks of the occupant slide forward on the seat surface, the thousand spines rotate,
This is to prevent such a sliding movement of the buttocks forward because the internal pressure of the intervertebral disc of the lumbar rises, the burden on the lumbar region increases, and fatigue increases. Particularly in the driver's seat of an automobile, the sliding movement of the buttocks forward interferes with the driving operation and further increases fatigue. On the other hand, it is desirable that the buttocks are allowed to slide relatively freely in the left-right direction. This is convenient for the getting on / off motion and the standing / sitting motion, and is also desirable in order not to excessively restrain the movement of the driver's body in the automobile and to facilitate appropriate posture change.

In response to such ergonomic requirements, the surface of the cushion seat (11), especially the seat portion (12), is formed by arranging the front knitted fabric (2) in the wale direction in the width direction. Due to this, a large slip resistance is exhibited against the front-back slip of the seated person's buttocks. on the other hand,
It becomes relatively easy to slide in the left-right direction. Therefore, for work in a sitting posture for a long time, or for driving
It can provide a seating environment suitable for workers and drivers and reduce fatigue.

[0039]

EXAMPLES Next, specific examples of three-dimensional seats suitable for the chair cushion sheet of the present invention will be shown in comparison with comparative examples.

Example 1 A three-dimensional solid knitted fabric having the following specifications was knitted with the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge / inch, distance between shuttles 15 mm) Wale density W: 8 threads / inch course density C: 14 threads / inch Finished thickness t ₂ : 13 mm Knitting yarn for front knitted fabric: 1300d / 96f Polyester / BC
F multi-filament (crimped yarn) Knitting yarn for back knitted fabric: 1300d / 96f polyester / B
CF multi-filament (crimped yarn) Connecting yarn: 800d Polyester monofilament Front knitted fabric structure: 1 repeat 12 course turtle shell mesh (1 in 1 out) Back knitted fabric structure: 1 repeat 4 course rhombus mesh (1
In / Out 1) Filling index P: 0.0179 The compression ratio and compression recovery ratio of the obtained three-dimensional solid knitted fabric sheet were measured, and the results are shown in Table 1 below.

The following measurement methods and calculation formulas were used as indexes of the compression rate and compression restoration rate.

[Measurement Method] The three-dimensional knitted sheet was cut into a 5 × 5 cm test and its initial thickness A was measured. Next, a weight of 5 kg was placed on the test piece and left for 10 minutes, the thickness B at that time was measured, and then the weight C was removed and the thickness C was measured after 10 minutes.

[Compression rate] Compression rate (%) = (AB) / A × 100 [Compression restoration rate] Compression restoration rate (%) = (CB) / (AB) × 100 Further, A cushion sheet for an automobile seat as shown in FIG. 3 was prepared by using the three-dimensional sheet obtained in the above, and its performance was evaluated, and the results are also shown in Table 1.

This evaluation method was carried out by evaluating subjective symptoms according to the scale method which has been adopted internationally. That is, two professional taxi drivers (age 55
Aged 58 years old and a large truck professional driver (age 5)
(0 years old), each with a cushion seat laid in the driver's seat, and whether or not there is pain in the neck, shoulders, back, hips, buttocks, or lower limbs felt by the driver after three consecutive hours of driving and use When all the subjects felt no pain in each part, they were evaluated as ○, and one or more people felt that one or more parts had a pain of 5 or more in the 10-point scale or more in the middle. The ones are indicated by X marks. In addition, the evaluation of the feeling of use was performed by the relative evaluation method, and the ones that were evaluated to be extremely good or good by all were marked with a circle, and the ones that were evaluated to have the least feeling of use were marked with a cross. It was

Example 2 A three-dimensional three-dimensional knitted fabric having the following specifications was produced with the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge / inch, distance between shuttles 15 mm) Wale density W: 9 threads / inch course density C: 10 threads / inch Finished thickness t ₂ : 13 mm Knitting yarn for front knitted fabric: 1300d / 96f Polyester / BC
F multifilament (crimped yarn) Knitting yarn for the back knitted fabric: 500d / 70f Polyester / multifilament connecting yarn: 600d Polyester monofilament Front knitted fabric structure: 1 repeat 2 course diamond mesh (1
In 1 out) Texture of back knitted fabric: double tricot (all-in) Filling index P: 0.0112 Regarding the obtained three-dimensional solid knitted fabric sheet, the compression rate and the compression restoration rate were measured in the same manner as described above, and the automobile was used. The performance of the seat cushion seat manufactured was evaluated, and the results are shown in Table 1 below.

Example 3 A three-dimensional three-dimensional knitted fabric having the following specifications was produced with the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge / inch, distance between shuttles 7 mm) Wale density W: 8 threads / inch course density C: 12 threads / inch Finished thickness t ₂ : 5 mm Knitting yarn for front knitted fabric: 1300d / 96f Polyester / BC
F multi-filament (crimped yarn) Knitting yarn for back knitted fabric: 1300d / 96f polyester / B
CF multifilament (crimped yarn) Connecting yarn: 300d polyester monofilament Surface knitted fabric structure: 1 repeat, 8 courses, turtle shell mesh (1
In 1 out) Texture of the back knitted fabric: 1 repeat 4 course diamond mesh (1
In / Out 1) Filling index P: 0.0048 Regarding the obtained three-dimensional solid knitted fabric sheet, the compression rate and the compression restoration rate were measured in the same manner as described above, and the performance evaluation was performed on the cushion sheet for automobile seats. The results are shown in Table 1 below.

<Comparative Example> A three-dimensional three-dimensional knitted fabric having the following specifications was knitted with the same knitting structure shown in FIG. 6 as in Example 3.

Knitting machine: Double Russell knitting machine (22 gauge /
Inch, distance between kettles 7 mm) Wale density W: 18 threads / inch course density C: 22 threads / inch Finished thickness t ₂ : 5 mm Knitting yarn for front knitted fabric: 150 d / 46 f Knitting yarn for polyester / multifilament back knitted fabric: 150d / 46f Polyester / multifilament connecting yarn: 200d Polyester / monofilament Front knitted fabric structure: 1 repeat, 8 courses of hexagonal mesh back fabric structure: 1 repeat, 4 courses, rhombus mesh filling index P: 0.0155 was obtained. With respect to the three-dimensional solid knitted sheet, the compression rate and the compression restoration rate were measured in the same manner as described above, and the performance of the cushion sheet for automobile seats was evaluated, and the results are shown in Table 1 below.

[0052]

[Table 1]

As shown in Table 1 above, the three-dimensional sheet according to the present invention is
Both the compressibility and the elastic recovery rate were excellent, eccentric buckling did not occur, and while having an appropriate cushioning property, the load supporting force was excellent.

Therefore, the seat cushion sheet manufactured by using the three-dimensional three-dimensional seat is excellent in elasticity, resilience, body pressure dispersibility, vibration absorption and breathability. It was confirmed that all of them were high in performance evaluation under the test.

[0055]

As described above, the three-dimensional seat according to the present invention is light in weight, excellent in breathability, and excellent in cushioning property as well as excellent in body pressure dispersibility and load when sitting and using. It does not show excessive subsidence locally, has excellent morphological stability, and has an excellent feeling of sitting and is less likely to be tired even after sitting for a long time.

Further, since a monofilament is used as the connecting yarn and a connecting layer having a truss structure in which the connecting yarn is obliquely cross-migrated between the front and back knitted fabrics, eccentric buckling due to the falling of the connecting yarn occurs. It has no cushion and has excellent cushioning and resilience with no directionality.

Furthermore, by setting the filling index P, which defines the substantial arrangement density of the connecting yarns, within the above-mentioned specific range, the cushioning property and the compression hardness are maintained, and the restoring force is excellent and the touch is good. It can have a good feeling.

Further, in the embodiments according to claims 2 and 3, a multifilament of 250 to 2500 denier is used as the ground knitting yarn of the front and back knitted fabrics, and 2 as the connecting yarn.
By using the monofilament in the range of 50 to 1000 denier, it is possible to obtain the cushion property in a suitable range, which is excellent in the feeling property of the surface and is excellent in versatility as a cushion sheet material for a chair.

Furthermore, as in claim 4, the front and back knitted fabrics are knitted into different kinds of through-hole structures, so that the form and characteristics of the use surface can be changed according to the preference of the user. It can be used.

According to the present invention, in the case of a cushioning sheet for a chair which is laid down on a seat of an automobile or the like as claimed in claim 5, by adopting the structure, the buttocks of a seated person can be It is difficult to slip in the front-rear direction and relatively easy to slip in the left-right direction. This is ergonomically well matched to the movement of the seated person in the seated state.

Further, by constructing as in claims 6 and 7, it is convenient that many chairs including the seats of automobiles have a backrest in which the backrest stands up from the rear end of the seat. It is possible to cope with this, and in particular, as a vehicle seat, it can be made to have excellent laying stability by being laid.

[Brief description of drawings]

FIG. 1 is an external perspective view of a cushioning sheet material made of a three-dimensional solid knitted fabric according to the present invention.

FIG. 2 is a cross-sectional view schematically showing the configuration of the sheet material shown in FIG.

FIG. 3 is a perspective view of a car seat cushion sheet according to the present invention.

FIG. 4 is a knitting organization chart of the three-dimensional knitted fabric according to the first embodiment.

FIG. 5 is a knitting organization chart of a three-dimensional knitted fabric according to a second embodiment.

FIG. 6 is a knitting organization chart of a three-dimensional knitted fabric according to a third embodiment.

[Explanation of symbols]

1 ... 3D solid sheet (3D knit) 2 ... Front knitted fabric 3 ... Back knitted fabric 4 ... Connecting thread 5, 6 ... Through hole 11 ... Cushion sheet 12 ... Seat part 13 ... Back support seat part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-199455 (JP, A) JP-A-2-229247 (JP, A) Actual development Sho 63-110260 (JP, U) Registered utility model 3055540 ( (58) Fields investigated (Int.Cl. ⁷ , DB name) D04B 21/10-21/14 A47C 31/11

Claims (4)

(57) [Claims] 1. A three-dimensional three-dimensional knitted fabric having a thickness of 10 to 15 mm in which a front knitted fabric and a back knitted fabric which are arranged apart from each other are connected by a connecting yarn, and the three-dimensional knitted fabric has a thickness of 6 to 16 gauge. The knitting machine having a row needle bed is knitted to have a density of 8 to 16 courses / inch, at least the surface knitted fabric is knitted into a through-hole structure such as a mesh or a tricot, and the connecting yarn is composed of a monofilament yarn, The knitting yarn of the front and back knitted fabric is formed by forming a connecting layer of a truss structure which is diagonally cross-migrated from the opposite stitches of the front and back knitted fabric to one or more wales and / or one or more courses away from each other. , 250-2500 denier Mar
Made of chifilament , the connecting yarn is a monofilament of 250 to 1000 denier.
Consists DOO, in front and back both knit, the land knitting yarn and make between the connecting yarn total thickness of the yarn stitches are set <br/> constant to 800 to 2500 Denny Le, is further calculated by the following formula The filling index P is 0.003 <
Three-dimensional sheet with P <0.09
The width of the front and back knitted fabric in the three-dimensional sheet in the wale direction
The seats are at least arranged in the direction.
Cushion seats for chairs that are characterized by Filling index P = (t × N × D) / (9000 × 10 2 × ρ
XT) [t: Inner dimension distance (cm) between two front and back knitted fabrics, N: Number of connecting yarns (threads / cm2) D: Average denier calculated from diameter of connecting yarns, ρ: Average of connecting yarns Specific gravity (g / cm3),
T: Unit volume of knitted fabric (cm3)] 2. The chair floor laying cloth according to claim 1, wherein the front and back knitted fabrics are knitted into different types of through-hole structures .
Session sheet . 3. and a seat seat comprising a three-dimensional sheet and the back support seat, according to claim 1 in which these two sheets portion is formed by rotatably connected bent at least part of the corresponding side
Seat cushion sheet for chairs described in. 4. The seat portion has a rearwardly extending insertion tongue piece at an intermediate portion of a rear side thereof, and both side portions of the tongue piece are connected to corresponding portions of a lower side of the backrest seat portion. The cushion sheet for a chair according to claim 3 .