JP2017213185A - Chair and manufacturing method of seat or backrest constituting chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a cushion property in an equal level to persons having different body weights in a seat or backrest configured by having an elastic textile sheet stretched in a frame.SOLUTION: An elastic textile sheet 2 comprises a group of warps 6 and a group of wefts 7. The warps 6 are in a right/left longitudinal posture and the wefts 7 are in a front/rear longitudinal posture. The elastic textile sheet 2 is divided into a center area 8 and two side areas 9, 10 positioned on outer sides of the center area. An elastic strength of a unit area satisfies a relationship: center are 8<first side area 9<second side area 10. The elastic strength is higher in right/left outer sides and therefor the elastic textile sheet 2 has high followability of change of stretching with respect to difference of a body type. A high elasticity warp 7a is in a front/rear longitudinal posture and therefor the number of the high elasticity warps 7a on which a load acts changes according to difference of a body type (difference of a right/left lateral width). As a synergetic effects, body weight sensitivity of a cushion property is high.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chair provided with a seat or back in which a body pressure of a seated person is supported by an elastic fabric sheet, and a method of manufacturing the seat or backrest constituting the chair. The “seat or backrest” here includes not only the seat and the backrest that are separated from each other, but also the seat and the backrest that are integrated. That is, the seat frame and the back frame are integrated, and the back seat integrated type frame is stretched with an elastic fabric sheet. Furthermore, when the frame is a back seat integrated system, the elastic fabric sheet for the seat and the elastic fabric sheet for the backrest are continuously one as a whole, and the elastic fabric sheet for the seat and the backrest In some cases, the elastic fabric sheet is separated separately.

  In a chair, the use of an elastic fabric (cloth spring) such as a mesh-like woven fabric or knitted fabric is widely used as a member that supports the body pressure of a seated person. This elastic fabric support type seat and backrest is excellent in breathability and design, but the fabric or knitted fabric is only stretched and deformed by the body pressure of the seated person, so cushion materials such as urethane and sponge are used. There is a drawback that the fit to the body is inferior compared to the structure stretched on the plate material (shell body). That is, since it does not deform so as to follow the shape of the body, there is a drawback that the fit is inferior.

  In addition, there is no support from the bottom in the case of a seat, and no support from the back in the case of a backrest. It has also been pointed out that this is the case. If the overall elastic strength is increased, the elongation becomes worse when used by a person with a light weight, leading to an evaluation of “hard”.

  In view of this, there has been proposed an improved plan for controlling the elongation by varying the elastic strength of the fabric depending on the location. As an example, Patent Document 1 discloses, as an example applied to the backrest, that the elastic strength in the left-right direction is varied in the vertical direction to increase the elastic strength of the portion where the seated person's waist hits. Patent Document 2 also discloses a similar technique.

  On the other hand, in Patent Document 3, taking a seat as an example, in a cushion fabric attached to a support arranged on the left and right, the elastic elastic yarn is arranged in a posture extending in the left and right direction, and the area of the left and right middle part is It is disclosed to form a low expansion / contraction part that does not easily extend in the left-right direction. Patent Document 2 describes that when a person is seated, a low stretchable part of a cushion fabric (elastic woven fabric or elastic knitted fabric) is deformed like a saddle of a bicycle.

JP 2009-112360 A Japanese Utility Model Publication No. 01-41320 JP 2006-109970 A (Patent No. 4544520)

  As described above, if the elastic fabric has uniform elastic strength throughout, even if it is cushioning suitable for a heavy person, the deformation is insufficient when used by a lighter person. A similar cushion for people with different weights that feel stiff and, conversely, a cushion that is suitable for a lighter person but feels too soft when used by a heavy person Although there is a problem that it is difficult to impart the property (comfort), it can be said that none of the patent documents can improve this point.

  In other words, taking a seat as an example, as shown in FIG. 1 (A), when viewed roughly, the seat is placed with two vertically long eggs arranged at the left and right, with the position of the seat bone being the maximum strength. Thus, the body pressure of the seated person is applied, and the area where the load is applied differs depending on the physique of the user. However, for example, as shown in Patent Document 3, when the elastic yarn is arranged in a left and right longitudinal posture, the load acting part is horizontally long at the position of the buttocks, and the load acting part is front and rear at the thigh part. Even if the physique (weight) is different, there is not much difference in the number of left and right horizontally long ferroelastic yarns 7a to which a load is applied, so that it is proportional to the weight of the user. As a result, the elongation of each of the ferroelastic yarns 7a changes, and it is difficult to give a similar cushioning property to persons with different weights.

  In order to obtain a high elastic force, it is preferable to use a woven fabric (woven fabric) rather than a knitted fabric (knitted fabric). In this case, when using a highly elastic yarn as a warp and when using a highly elastic yarn as a weft However, in Patent Document 3, when a highly elastic yarn is used as a part of the warp group (a highly elastic yarn is woven into the warp group), the woven yarn is fed out at a constant speed. As the weft yarn is entangled with the group of warp yarns, the high elastic yarn is difficult to deform, but the low elastic yarn is easily deformed. Twist occurs, and it is easy to fall into the impossible to weave on the way.

  On the contrary, if the elastic yarn is used for a part of the group of wefts, the density of the warp must be increased at the low stretch part, but the weft is entangled with the warp while the density of the warp is changed in the weft direction. Is technically very difficult. Therefore, in Patent Document 3, the aim is worthy of evaluation, but it is understood that there is a great problem in terms of manufacturing.

  The present invention has been made in order to improve such a current situation, and is based on the premise that a high support strength is ensured by using an elastic fabric instead of an elastic knitted fabric as an elastic fabric for supporting body pressure. The purpose is to give the same cushioning properties to persons who are different from each other and to make the elastic fabric commercially available.

The invention of the present application includes the invention of a chair and a method of manufacturing a seat or a backrest constituting the chair. Claim 1 specifies the invention of the chair,
“The seat or the backrest or both include an elastic fabric sheet that supports the body pressure of the seated person, and a frame body on which the elastic fabric sheet is fixed substantially over the entire circumference.
The elastic fabric sheet is divided into a center region located on the left and right intermediate portion side and a side region located on the left and right outside thereof, and the elastic strength per unit area is made stronger in the side region than the center region. Is set to ",
It is the composition.

  In addition, the “elastic strength” of the elastic fabric sheet can be broken down into a strength against the elongation in the left-right direction and a strength against the elongation in the longitudinal direction, but the elongation direction of the yarn is not related in terms of resistance to body sinking, Either the left-right direction or the vertical direction may be used.

  There is no limitation on the lateral width of the center area and the lateral width of the side area. Therefore, the present invention includes a configuration in which the elastic strength per unit area gradually increases from the left and right intermediate portions toward the left and right ends. It is also possible to weave only the center region into a structure where the elastic strength gradually changes, or weave only the side region into a structure where the elastic strength gradually changes.

  As a preferred specific example of claim 1, in claim 2, a plurality of types of yarns having different elastic strengths are used for the elastic fabric sheet, and the ferroelastic yarn having the highest elastic strength is orthogonal to the left-right direction. Used in a long posture in the vertical direction.

  The invention of claim 3 embodies claim 1 or claim 2, and in this invention, the side region is further divided into a plurality of regions divided in the left-right direction, and the plurality of side regions. The elastic strength per unit area increases as the distance from the center region increases. The side region may be divided into two left and right child regions, or may be divided into three or more child regions.

Invention of Claim 4 in any one of Claims 1-3,
"The elastic fabric sheet is composed of a group of warps and a group of wefts, the warps are in a long posture in the left-right direction, and each weft is in a long posture in the vertical direction perpendicular to the left-right direction. And
A plurality of types of yarns having different elastic strengths are used as the wefts, and by increasing the number of ferroelastic yarns having the highest elastic strength in the side region than in the center region, The elastic strength per unit area is increased. ''
It is the composition.

  As a specific example of claim 4, in claim 5, the yarn having the highest elastic strength among the plurality of types of wefts is alternately entangled with a group of warp groups each consisting of a plurality of warps. I have to.

The invention of claim 6 relates to a method of manufacturing a seat or a backrest,
"A belt-shaped elastic fabric original fabric is woven by letting out the wefts in a direction perpendicular to the warp while feeding a large number of warp yarns arranged in parallel in the longitudinal direction, and the elastic fabric original fabric is seated or Cut into an elastic woven sheet with dimensions corresponding to the backrest, and the elastic woven sheet on the frame constituting the outer shape of the seat or the backrest, with the warp in a long posture in the left-right direction and the weft in the longitudinal direction perpendicular to the left-right direction. `` Longly fixed around the entire circumference in a long posture, so that the elastic fabric sheet obtains a seat or a backrest that supports the body pressure of the seated person. ''
It is the basic composition.

And in the above basic configuration,
"A strong elastic yarn is used as the weft, and the number of the strong elastic yarns per unit width in the right and left is increased in the side region located on the left and right outside of the center region on the left and right intermediate part side. The elastic strength per unit area is set to be higher in the side region than the center region,
Therefore, an elastic strength pattern corresponding to one strong elastic yarn sheet is repeatedly formed in the longitudinal direction on the original fabric "
It has the characteristics.

  In Patent Document 3, it is described that the right and left width of the low stretchable part is 5 to 15 cm, but in the present invention, the left and right width of the center region can be set to about 15 to 20 cm. However, this is an example, and the left and right widths can be arbitrarily set for both the center region and the side region.

  Now, physique and weight are proportional, and the width of the waist and hips is usually proportional to body weight. Therefore, it can be said that the seating area supported by the elastic fabric sheet is proportional to the body weight, but if the entire elastic fabric sheet has a uniform elastic strength, the change in the amount of elastic fabric sheet (elastic deformation) changes. Tend to not follow the change in body weight. For this reason, even if the weight is heavy, even if the amount of elongation is suitable for a person, the person who has a light weight felt that it is hard because there is little elongation.

  On the other hand, in the present invention, since the elastic strength of the elastic fabric sheet is weak (low) in the center region and strong (high) in the side region, taking the seat as an example, the right and left of the hip (waist) The followability of the stretch amount (elastic deformation amount) of the elastic fabric sheet with respect to the difference in width can be significantly improved.

  In other words, when a person with heavy weight sits down, the buttocks widen widely in the side area, so the overall elastic strength becomes very high and it can be supported accurately in a state that allows moderate elongation, while a person with light weight If you sit down, the support area in the side region with high elastic strength will be small, so it will support the buttocks at the part that is easy to expand and contract. I can support it.

  Thus, in this invention, since the followability of the elastic deformation of the elastic fabric sheet with respect to the difference in physique (difference in the right and left width of the buttocks) is increased, the function of giving the same level of cushioning properties to persons with different weights. improves.

  When an elastic fabric is used as a member that receives the body pressure of a seated person, the ferroelastic yarn is conventionally arranged in a left-right longitudinal posture, whether it is a seat or a backrest. This can be said to correspond to the elastic fabric being strongly pulled in the left-right direction by the body pressure of the seated person. In other words, taking a seat as an example, a strong load is applied to the elastic fabric at the position of the buttocks of the seated person, and this load is greatly spread in the left-right direction. Therefore, in order to increase the elastic strength of the yarn that is long in the left-right direction, a part of the left-right longitudinal yarn is made a highly elastic yarn.

  And since the elastic elastic yarn is in a left and right longitudinal posture, the elastic fabric is only deformed into a sliver shape by the body pressure of the seated person, and therefore it can be said that the fit to the body was not sufficient. . In addition, as described with reference to FIG. 1 (A), since the highly elastic yarn is arranged in the left and right longitudinal posture, the weight sensitivity of giving the same cushioning property to different weight persons is sufficient. It is thought that it is not.

  On the other hand, in the invention of claim 2, as schematically shown in FIG. 1 (B), the number of the ferroelastic yarns 7a to which the load acts is reduced by the fact that the ferroelastic yarns 7a are in the vertically long posture. It is easy to change in proportion to the size (left and right width of the buttock), so that the amount of elongation of each ferroelastic yarn can be equalized. Therefore, in combination with the configuration in which the elastic strength is higher in the side region than in the center region, it is more certain that the same degree of cushioning is given to users with different weights.

  The invention of claim 3 is more preferable because the responsivity of the elastic deformation of the side region with respect to the difference in the weight of the user increases. The same effect is exhibited when the elastic strength of the side region is gradually changed. If the structure of Claim 5 is employ | adopted, since the bending of a highly elastic weft will decrease, the floating of a highly elastic weft can be prevented and the appearance and the touch can also be made favorable.

  In the configuration of claim 4, in the weaving process of the elastic woven sheet, it is sufficient to simply draw out the elastic yarn of the same thickness as the unit warp, so that the weft is entangled with the weft and the warp having different thickness and elastic strength. However, there is no great difference in tension between each unit warp, and there is no twisting as a woven fabric. Therefore, since there is no big problem in manufacture and it can manufacture with the manufacturing method of Claim 6, the elastic fabric sheet excellent in functionality can be provided on a commercial basis.

  A person may sit down with the body to the left or right. However, if the width of the elastic fabric sheet is set to about 180 to 200 mm, the left and right seat bones can be moved even if the seated person moves the body to the left or right. High stability can be secured because the location can be supported accurately.

  As a means for configuring the elastic woven sheet in areas having different strengths, it is possible to prepare a plurality of types of woven fabrics having different elastic strengths, arrange them on the left and right, and join the woven fabrics adjacent to the left and right by sewing or the like. If it is composed of a series of woven fabrics as described in claim 4 and claim 6, it is possible to simplify the manufacturing process by eliminating the joining process and to stabilize the quality by avoiding the tearing phenomenon of the joined part. There are advantages you can do.

(A) is a schematic diagram of a comparative example, (B) (C) is a schematic diagram of this invention. It is a top view of the seat concerning an embodiment. (A) is a schematic plan view of the second side region, (B) is a schematic plan view of the first side region, and (C) is a schematic plan view of the center region. It is a figure which shows the example of a structure | tissue of a 2nd side area | region. It is a schematic diagram which shows a manufacturing method. It is a figure which shows other embodiment, (A) is a top view, (B) is the BB view of (A), (C) is CC sectional view of (A), (D) is another FIG. FIG. 6 is a view showing still another embodiment, in which (A) is a plan view of a seat frame, (B) is a view taken along line BB of (A), and (C) is a view showing a deformed state of an elastic fabric sheet, (D ) Is a sectional view taken along the line DD in (A). It is a figure which shows other embodiment.

(1). Outline of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to the seat. As shown in FIG. 2, the seat has a seat frame 1 constituting the outer shape thereof, and an elastic woven sheet 2 stretched (attached) thereto. The seat frame 1 is made of resin or metal, and has left and right side members 3, a front member 4 connected to the front ends thereof, and a rear member 5 connected to the rear ends of the left and right side members 3. It is formed in a substantially square shape in plan view.

  Although the seat frame 1 of the embodiment opens up and down, a shell structure product made of resin or metal plate (steel plate) may be used. The point is that the elastic fabric sheet 2 can be allowed to sink. The planar shape of the seat can be circular, trapezoidal, or inverted trapezoidal according to design requirements.

  The entire periphery of the elastic fabric sheet 2 is fixed to the seat frame 1. As a fixing means, the seat frame 1 is constituted by upper and lower members and held between them, or an edge member such as a tape is fixed to the periphery of the elastic fabric sheet 2 and the edge member is inserted into the seat frame 1. For example, various modes can be adopted. When the edge member is fitted in the groove of the seat frame 1, the groove is usually formed on the outer peripheral surface of the seat frame 1. In this case, the entire seat frame 1 is covered from above with the elastic fabric sheet 2. It will be.

  The elastic woven fabric sheet 2 has a group of wefts 7 entangled with a group of warp yarns 6, with the warp yarns 6 in a horizontally long posture and the weft yarns 7 in a longitudinally long posture. In the seat to which this embodiment is applied, the front-rear direction is the vertical direction described in the claims.

  The elastic fabric sheet 2 includes a center region 8 that constitutes the left and right intermediate portions, a first side region 9 that is positioned on the left and right outer sides, and a second side region 10 that is positioned on the left and right outer sides of the first side region 9. Consists of. Therefore, it is a left-right symmetric aspect across the longitudinal center line 11. As specific dimensions, the lateral width of the center region 8 can be set to about 180 to 200 mm, the lateral width of the first side region 9 can be set to about 50 to 70 mm, and the lateral width of the second side region 10 can be set to about 30 to 50 mm. Each side region can be formed as one side region without being divided into two, or can be divided into three or more.

  The elastic strength against tensile force in the front-rear direction per unit length in the left-right direction (stress against tensile force, elastic restoring force) is lower in the center region 8 than in the first side region 9, and the first side region 9 is in the second side region 10. Is weaker than The elastic force in the left-right direction of the elastic fabric sheet 2 (the elastic strength against the pull in the left-right direction per unit width in the front-rear direction) is the same at any position in the front-rear direction. In addition, it is also possible to weld each warp 6 and the weft 7 at the crossing part of each other.

(2). Specific structure of elastic fabric sheet In this embodiment, the warp 6 uses two kinds of yarns, a first warp 6a having elasticity and a second warp 6b having basically no elasticity. Yes. As the first warp 6a, for example, a wooly yarn can be used. As the second warp 6b that is basically inelastic, for example, a tough tire cord raw yarn can be used. The reason why the two types of yarns are used in this way is to adjust the tension and strength in the left-right direction of the elastic fabric sheet 2 as a whole. As the wooly yarn, for example, about 900 denier yarn can be used. The ratio and arrangement of both warps 6a, 6b can be arbitrarily changed.

  The weft 7 uses a highly elastic weft 7a having a relatively large longitudinal elastic strength, and a first low elastic weft 7b and a second low elastic weft 7c having a longitudinal elastic strength smaller than that of the highly elastic weft 7a. ing. “Low elasticity” means that the elastic strength is smaller than “strong elasticity”, and has the strength to support the weight of a person.

  As the strong elastic weft 7a, for example, a resin yarn sold by Toyobo Co., Ltd. under the trade name (registered trademark) of Diaflora can be used. As the first low elastic weft 7b, for example, the above-described Woolley yarn can be used, and as the second low elastic weft 7c, a stretch yarn sold by Kawabo Textile Co., Ltd. under the trade name “Pasta” is used. (Elastic yarn) can be used. In the sample of this embodiment, a diamond flora having a 1080 denier was used, and a pasta having a 1500 denier was used.

  Diaflora is a polyester-based monofilament in which an elastomer is coated with a sheath tube, and has an excellent strength but is difficult to bend. Accordingly, it is troublesome to entangle the warps 6 one by one. However, as shown in FIG. 4, if a plurality of warps 6 are entangled with the group 12 as one group 12, the bending of the strong elastic weft 7a is sufficient, so even if it is a tough strong elastic weft 7a. Easy to apply. It is also possible to make a missing portion of one warp 6 between the adjacent groups 12, and in this case, the bending of the strong elastic weft 7a becomes more gentle.

  In the case where the highly elastic weft 7a is entangled with the group 12 of the warps 6, the group 12 is constant in the left-right direction in FIG. 4A, but in FIG. 4B, the group 12 is shifted by 1 pitch in the longitudinal direction. Says. Either can be adopted.

  As the low elastic wefts 7b and 7c and the warp yarn 6, both multifilaments and monofilaments can be adopted. However, considering the ease of entanglement deformation, it can be said that twisted or non-twisted multifilaments are preferable. In the case of multifilaments, a bundle of thin yarns can be used as an intermediate yarn, and a plurality of intermediate yarns twisted can also be used.

  The elastic fabric sheet of the present embodiment is basically a plain weave, but the strong elastic weft 7a is entangled with the group 12 of warps 6 as described above. As shown in FIG. 3, in the second side region 10, the front part or most part as the weft 7 is constituted by the highly elastic weft 7 a, and in the first side region 9 and the center region 8, By using the strong elastic wefts 7 a and the low elastic wefts 7 b and 7 c, the number of the strong elastic wefts 7 a per unit left and right width is increased in the first side region 9 than in the center region 8. As for the low elastic wefts 7b and 7c, the center region 8 uses a larger number of first low elastic wefts 7b having a lower elastic strength than the first side region 9.

(3) Production procedure / summary The elastic woven fabric sheet 2 can be obtained by using a strip-shaped raw fabric 14 as a material and cutting it into a predetermined length. As shown in FIG. 5, the original fabric 14 uses a loom to fly the wefts 7 (strong elastic wefts 7a and low-quasielastic wefts 7b and 7c) with a shuttle while unwinding the group of warps 6 in the longitudinal direction. Then, it is woven by entwining the warp yarn 6.

  Therefore, the pattern of one elastic fabric sheet 2 appears continuously on the raw fabric 14. In the adjacent elastic fabric sheets 2, the second side regions 10 may be continuous with each other and cut so that the second side regions 10 are equally divided, or between the adjacent elastic fabric sheets 2. A blank portion where the wefts 7a and 7b) do not exist may be provided and cut at the position of the blank portion. While weaving the second side regions 10 of adjacent elastic woven fabric sheets 2 in a continuous state, as shown by the dotted line at the boundary portion, the boundary yarn is clearly different in color from the weft yarns 7 (7a, 7b). It is also possible to drive a single 15 and cut the raw fabric using the boundary yarn 15 as a guide.

  In the above configuration, when a person sits on the seat, the warps 6 (6a, 6b) and the wefts 7 (7a, 7b, 7c) are stretched and deformed according to the magnitude of the load. In this case, as described with reference to FIG. 1B, if the physique (weight) of the seated person is different, first, the load acts more strongly than when the strong elastic weft 7a is arranged in the horizontally long posture. Since the change in the number of the strong elastic wefts 7a is large, the magnitude of the load acting on each of the strong elastic wefts 7a (the size of the elongation) can be made as common as possible even if the weights of the users are different.

  That is, when a person with a heavy weight is used, the number of the strong elastic wefts 7a in which the load acts strongly increases, and when a person with a light weight is used, the number of the strong elastic wefts 7a in which the load acts strongly decreases. In any case, the amount of elongation of one strongly elastic weft 7a can be equalized as much as possible.

  Furthermore, since the elastic strength is set to the relationship of the center region 8 <the first side region 9 <the second side region 10, the followability of the stretch of the elastic woven fabric sheet 2 with respect to the difference in the left and right widths of the buttocks (waist) is achieved. It is high, and the entire elastic fabric sheet 2 can be changed at a large change rate corresponding to the difference in the weight of the user. These synergistic effects can give the same degree of cushioning and fit to people with different weights.

  Since the strong elastic weft 7a is in the longitudinal and longitudinal posture, the strong elastic weft 7a positioned between the left and right scapulas of the seated person does not take much load, and the elongation is small (or hardly stretched). It can be said that the elastic fabric sheet 2 can be deformed so that the left and right intermediate portions are ridge lines.

  As means for changing the elastic strength of each region, it is also possible to change the driving pitch of the weft yarn 7 instead of or in addition to changing the number of driving the strong elastic weft yarns 7a. Alternatively, it is possible to change the thickness of the strong elastic weft 7a.

(4). Embodiment of FIG. 6 Next, another embodiment shown in FIG. 6 will be described. This embodiment is basically the same as the above-described embodiment, but as a first difference, the rear member 5 constituting the seat frame 1 is formed in a mountain shape when viewed from the front. In this way, when the rear member 5 is formed in a mountain shape when viewed from the front, the left and right intermediate portions of the elastic fabric sheet 2 are raised on the ridge line from the beginning, so that fit to the body can be further improved.

  As another feature, the front end portion of the side member 3 constituting the seat frame 1 is bent in a U-turn shape so as to go from the lower side to the rear side, and the front portion 2a of the elastic woven fabric sheet 2 is also folded back to be sideways U It has a letter shape. And the two U-shaped front portions 2a are stacked. The front portion 2a is integrated by being folded after being folded back, but it is also possible to sew another cloth material to form a two-ply structure (multi-ply structure).

  In this configuration, since the thigh of the seated person does not hit the front member 4, it is possible to eliminate the push-up feeling. Also, when a person is seated, the front part 2a is pulled backwards, but when two horizontal U-shaped parts are stacked, resistance to backward pulling is increased, so that backward displacement is suppressed, A ridge line is easily formed on the elastic fabric sheet 2. As shown in (C), the front member 4 may only be bent downward.

(5). Embodiment of FIG. 7 The embodiment shown in FIG. 7 is a further development of the embodiment of FIG. In this embodiment, first, the main body portion of the front member 4 is disposed behind the front end of the side member 3 so as to be lower than the upper surface of the side member 3, and an elastic fabric is formed in the left and right intermediate portions of the front member 4. A front chevron support portion 17 is provided for supporting the left and right intermediate portions of the seat 2 in a state where they are raised upward (ie, protruded). The front chevron support portion 17 is curled upward in a side view, and is a rearward chevron in a plan view. The upper end of the front chevron support portion 17 is higher than the upper surface of the side member 3.

  The rear member 5 is symmetrical to the front member 4 and its main body is located lower than the upper surface of the side member 3 and in front of the rear end of the side member 3, and the rear member 5 is provided with rear mountain-shaped support portions 18 that support the left and right intermediate portions of the elastic woven fabric sheet 2 in a raised state. The rear chevron support portion 18 is curled upward in a side view, and is a forward chevron in a plan view. The upper end of the rear chevron support portion 18 is higher than the upper surface of the side member 3.

  In this embodiment, since the angle support portions 17 and 18 are formed on the front member 4 and the rear member 5, long ridge lines are formed in the left and right intermediate portions of the elastic fabric sheet 2 before and after the person is seated. When the person is seated, the elastic fabric sheet 2 sinks downward and deforms while maintaining the ridgeline. For this reason, the fitting property with respect to a seated person's buttocks is high.

  Furthermore, in this embodiment, since the elastic fabric sheet 2 wraps downward on the left and right outer sides of the mountain-shaped support portions 17 and 18 of the front member 4 and the rear member 5, it is easily deformed in the front-rear direction. . For this reason, the cushioning property of the elastic fabric sheet 2 is remarkably high. That is, among the elastic fabric sheet 2, the left and right front portions 2a and rear end portions 2b sandwiching the mountain-shaped support portions 17 and 18 function as springs that buffer the elongation of the elastic fabric sheet 2. , Cushioning can be significantly improved.

  Further, since the front member 4 wraps downward on both the left and right sides of the mountain-shaped support portion 17, the user's thigh is not pushed up. Also in this aspect, it is possible to soften the contact with the body and provide comfort to the person.

  As a modification of the present embodiment, the front and rear chevron portions 17 and 18 may be configured not to protrude upward from the side member 3. In this case, when the person is not seated, no ridgeline is seen in the elastic fabric sheet 2, and when the person is seated, the left and right side parts sink and the ridgeline appears. Therefore, it is possible to improve fit while keeping the design clean. In the case of FIG. 7 as well, as in the case of FIG. 6, the front and rear portions (or either one of the front and rear) that are U-shaped in a side view can be formed into a stacked structure by folding or the like. Thereby, the spring property of an edge part can be improved.

(7). Embodiment of FIG. 8 and Others FIG. 8A shows an example in which the woven structure is changed. That is, this embodiment has a center region 8, a first side region 9, and a second side region 10 as in the first embodiment. However, the second side region 10 has a plain weave structure and has a first side. The region 9 has a two-point jump twill structure, and the center region 8 has a three-point jump twill structure. The first side region 9 actually has a much longer left and right length.

  Thus, by changing the woven structure in each area, the design value can be improved by forming a pattern on the elastic fabric sheet 2. It is also possible to express various patterns by changing the colors of warp and weft. For example, a check pattern can be expressed by forming a plurality of warp yarns and weft yarns as a single group into a large number of groups, and alternately changing the group colors into two colors.

  In the embodiment shown in FIG. 8 (B), an auxiliary region 19 having high elastic strength is formed at the center of the elastic fabric sheet 2, and the left and right sides sandwiching the auxiliary region 19 are arranged in the center region 8 and the first side region 9. The second side region 10 is divided. In this embodiment, although the elastic strength of the auxiliary region 19 is high, a large load does not act on the intermediate portion. Therefore, even if the auxiliary region 19 is provided as in this embodiment, there is no difference in effect. It is also possible to combine this embodiment with the embodiment of FIGS. The auxiliary region 19 may have the same elastic strength as the second side region 10, may be stronger than the second side region 10, may be weaker than the second side region 10, and stronger than the center region 8. Also good.

  Although the above embodiment is applied to a chair, it can be applied to a backrest. The chair to which the present invention can be applied includes a variety of chairs such as a swivel chair, a pipe chair, a fixed chair such as a theater, and a bench on which a plurality of people can hang. In the case of a chair with a backrest, the present invention may be applied to only one of the seat and the backrest, or may be applied to both.

  The present invention can be embodied in a chair. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Seat frame 2 Elastic fabric sheet 6 Warp 6a First warp (elastic warp)
6b Second warp (inelastic warp)
7 Weft 7a High elastic weft 7b First low elastic weft 7c Second low elastic weft 8 Center region 9 First side region 10 Second side region 12 Group of warp

Claims (6)

The seat or the backrest or both comprise an elastic fabric sheet that supports the body pressure of the seated person, and a frame body on which the elastic fabric sheet is fixed over substantially the entire circumference,
The elastic fabric sheet is divided into a center region located on the left and right intermediate portion side and a side region located on the left and right outside thereof, and the elastic strength per unit area is made stronger in the side region than the center region. Set to
Chair The elastic fabric sheet uses a plurality of types of yarns having different elastic strengths, and the ferroelastic yarn having the highest elastic strength is used in a long posture in the vertical direction perpendicular to the left-right direction.
The chair according to claim 1. The side region is further divided into a plurality of regions divided in the left-right direction, and the plurality of side regions have higher elastic strength per unit area as they move away from the center region.
The chair according to claim 1 or 2. The elastic fabric sheet is composed of a group of warps and a group of wefts, the warps are long in the left-right direction, and each weft is long in the vertical direction perpendicular to the left-right direction. ,
A plurality of types of yarns having different elastic strengths are used as the wefts, and by increasing the number of ferroelastic yarns having the highest elastic strength in the side region than in the center region, Increases the elastic strength per unit area,
The chair as described in any one of Claims 1-3. Among the plurality of types of wefts, the yarn having the highest elastic strength is alternately entangled with a group of warp groups each composed of a plurality of warps,
The chair according to claim 4. While feeding a number of warps arranged in parallel in the warp direction which is the longitudinal direction of the warp, the belt-like elastic fabric original is woven by flying the wefts in a direction perpendicular to the warp, and the elastic fabric original is seated or backrested. The elastic woven sheet is cut into an elastic woven sheet having a size corresponding to It is configured to be fixed over substantially the entire circumference so as to be in a posture, and thus obtain a seat or a backrest where the body pressure of the seated person is supported by the elastic fabric sheet,
A strong elastic yarn is used as the weft, and the number of the elastic elastic yarns per unit width in the left and right units is increased in the side region located on the left and right outside of the center region on the left and right intermediate portion side, thereby The elastic strength per area is set to be higher in the side region than the center region,
Therefore, a strong and weak pattern corresponding to one strong elastic yarn sheet is repeatedly formed in the longitudinal direction on the original fabric.
Manufacturing method for chair seat or backrest.

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