JP2016022280A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair suitable for using in the outdoors, having high followability to a postural change while having a structure allowing the continuation of a relaxing state, and suitable for match watching.SOLUTION: A seat part 10 is set to have a forward-downward seating face angle in which a front part is positioned below a rear part to a horizontal line, and a backrest 20 is set to have a back angle inclining backward to a vertical line as a prescribed angle. A seated person can take a backward-bent posture of a prescribed angle when leaning on the backrest 20, and take a large back seating angle (an angle made by the seat part and the backrest) and easily relax owing to that a seating face angle of the seat part 10 is forward-downward (structure that a seating face angle is in a negative direction to the horizontal line). Since the seating face angle is forward-downward, pressure concentration on the thigh part, especially the back of the knee is softened so as to facilitate performing a postural change from a normal posture to a bent forward posture and a standing-up action.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a chair, and more particularly to a chair suitable for a spectator seat used outdoors such as a stadium stand for sports.

  A large number of chairs for watching games used in sports stadium stands for baseball, soccer, etc. are installed from a few hundred seats to tens of thousands seats, and those that can be manufactured at low cost are often used. For example, it is often made of hard plastic and has a simple shape in which the backrest stands up at about 90 degrees with respect to the seat. In addition, when used outdoors, it is necessary to take measures against rain, and some have a drain hole formed in the seat (see Patent Document 1).

  On the other hand, as shown in Patent Document 2, the present inventor has proposed various vehicle seats using a three-dimensional solid knitted fabric. Three-dimensional solid knitted fabrics exhibit high rigidity when pressed over a predetermined area, while exhibiting soft spring characteristics when pressed partially, can support the human body firmly even when thin, and are partially strong It is not pressed by reaction force and is suitable for sitting for a long time.

JP 2004-147772 A WO2002 / 091881

  As described above, since a large number of chairs for watching games at a stadium are installed, many chairs that are compact and can be manufactured at low cost are used. At present, most of them are based on a simple work chair with a backrest arranged at a substantially right angle to the seat, or a comfortable cushion with a thick cushion member on the seat and backrest used in VIP seats, etc. It is like a chair and is not necessarily suitable for watching games. Because watching games at the stadium can take several hours, there are limited chairs that are comfortable and comfortable to sit in the sense that it is easy to maintain feelings and posture suitable for watching games. It has become. The three-dimensional solid knitted fabric shown in Patent Document 2 is suitable as a cushion member for a chair for watching a game in an outdoor stadium because it is lightweight and thin and has excellent cushioning properties, heat retaining properties, and breathability. However, as in Patent Document 2, a structure in which a planar spring member is disposed under a three-dimensional solid knitted fabric and this planar spring member is supported by a coil spring is a characteristic required for a vehicle seat. However, if all of these structures are applied to a spectator chair at a stadium where the acceleration input from outside such as vibration is low, it will be too costly and the installation space will be large. It tends to be.

  In addition, as shown in Patent Document 1, the chair for watching games has a seating surface angle with respect to the horizontal line of 0 degrees to several degrees (several degrees on the backrest side) and a back angle with respect to the vertical line of the backrest of 0 degrees. To several degrees (when the horizontal line of the seat is used as a reference, the angle from the horizontal line to the backrest is approximately 90 degrees). If the back angle is too large, the footrest space in the rear seat will be infringed. If the back angle is too small, it is cramped and it is hard to say that it is comfortable to sit on. In other words, if the angle between the femur and the spinal column cannot be taken around 100 degrees or more, the abdomen is compressed and it is difficult to breathe and to relax. On the other hand, when addicted to watching the game, the seated person tends to be inclined from the relaxed position with his back to the front and leaning away from the back, and sits close to the front of the seat. It tends to take. It may also stand up. That is, since such posture changes frequently occur while watching a game, it is desirable to have a function that helps the posture changes.

  The present invention has been made in view of the above, and can be manufactured at a low cost with a simple configuration, is excellent in drainage, suitable for outdoor use, and in particular, a configuration capable of continuing a relaxed state, It is an object of the present invention to provide a chair that has high followability to posture changes due to movement of the center of gravity and is suitable for watching games.

  In order to solve the above-described problems, a chair according to the present invention is a chair having a seat and a backrest, and the seat includes a cushion member for a seat supported by a seat frame, and the horizontal line. A predetermined back angle formed by a front-lowering seating surface angle positioned below the rear part, the backrest including a backrest cushion member supported by the backrest frame, and inclined backward with respect to the vertical line It is characterized by being formed.

A back seat angle from a front edge portion of the seat cushion member to an upper edge portion of the back cushion member around a boundary point between the seat cushion member and the back cushion member is 100 to 150. A range of degrees is preferred. It is preferable that the seating surface angle is set such that the front portion is inclined with respect to the horizontal line in the range of 2 to 25 degrees below the rear portion. It is preferable that the back angle is set in a range of 8 to 35 degrees backward with respect to the vertical line.
It is preferable that a height difference between a boundary point between the seat cushion member and the back cushion member and a front edge portion of the seat cushion member is in a range of 20 to 120 mm.
It is preferable that the height from the installation surface of the front edge of the seat cushion member is provided in a range of 420 to 500 mm.

  The seat frame includes a front frame having a predetermined length disposed at a front portion, a rear frame having a predetermined length disposed rearward at a predetermined interval with respect to the front frame, and the front frame. And a seat-side side frame spanned between each end of the rear frame, and the front frame, the rear frame, and the seat-side side frames are seen from the side, and the horizontal line On the other hand, it is preferable that the front part is formed so as to be positioned below the rear part.

It is preferable that the height when the seat cushion member is depressed most is set to be equal to or higher than the height of the lower portion of the front frame.
It is preferable that the seat cushion member includes a base net for a seat made of a two-dimensional or three-dimensional fabric, and the base net for the seat is stretched over the seat frame.

The backrest is a belt-like backrest in which the backrest frame is formed in a frame shape, the backrest cushion members are stretched vertically on both sides of the backrest, and the lower portion is connected to the rear portion of the base net for the seat portion. A side base net for use, and one or more belt-like central base nets for the backrest that are stretched over the backrest frame between the two backrest side base nets located on both sides of the backrest, When viewed from the side, it is preferable that the lower part of the central base net for the backrest is connected to the rear part of the base net for the seat part so that the lower part is located behind the lower part of the side base net for the backrest. .
It is preferable that elastic members for supporting the waist are laminated along the width direction of the backrest which is a direction substantially orthogonal to the side base net for the backrest and the central base net for the backrest.

  In the chair according to the present invention, the seat is set such that the front part is a front-lowering seating angle located below the rear with respect to the horizontal line, and the backrest is rearward with respect to the vertical line. The inclined back angle is set to be a predetermined angle. That is, when the seated person is seated on the backrest, the seat can take a backward tilted posture, and the seating surface angle of the seating part is lowered forward (configuration in which the seating surface angle is in the minus direction with respect to the horizontal line). Therefore, it is possible to take a large back seating angle (the angle between the seat and the backrest), which makes it easy to stretch legs and stretch exercises, and it is easy to relax and become concentrated. In addition, the present invention makes it possible to reduce the back angle when the back seat angle is the same when compared with a normal chair (front-up chair) having a seat surface angle of 0 ° or more. The intrusion of the backrest into the person's footrest space can be reduced.

  In addition, when a person is seated on the chair of the present invention with the back resting on the backrest, the seat cushion member sinks a predetermined amount around the part corresponding to the sciatic nodule, but the seating surface when not seated Since the angle is negative (downwardly forward), the pressure on the back of the knee is lower than that of a normal forward-upward chair, and the pressure is relatively higher in the region about 100 mm closer to the knee than the pelvis. That is, the seating posture is not concentrated on the buttocks so-called sciatic tubercle but the pressure is concentrated on the rear end of the thigh. Therefore, the weight is supported in a wide area, and a stable sitting posture can be taken. In addition, since the surface of the cushion member for the seat portion is forwardly lowered when not seated, the height of the buttocks is greater than the height of the lower portion of the front frame with which the front thigh or the back of the knee abuts when seated. Prone. For this reason, bending moments are less likely to enter muscle groups around the femur, and as a result, weight is supported in a wide area, and the load concentration on the part corresponding to the sciatic nodule is less than 0 degrees. This is less than the usual chair. That is, by moving the center of gravity of the trunk forward, body pressure dispersibility increases, and numbness to the buttocks and thighs is less likely to occur even when sitting for a long time. As a result, an event that hinders the concentration of the seated person, so-called fatigue, is unlikely to occur.

  In addition, when seated, the force that biases the buttocks forward and upward is likely to act, so it is easy to move the buttocks forward and get up easily when you are engrossed in watching the game by moving the center of gravity. It is excellent in followability to posture change and assist property to promote posture change.

  For these reasons, the chair of the present invention is not only easy to relax, but also has a structure that makes it easy to change posture for concentration, and it is easy to maintain a calm state, while smoothly shifting to an appropriate excitement state. Yes, it is suitable not only as a chair for watching games such as sports, but also as a chair for work and study.

  In addition, when the seat is not seated, the seat surface is lowered forward, so that rain dew or the like tends to flow forward along the seat surface, has excellent drainage, and is suitable for outdoor use. Furthermore, the present invention supports the seat cushion member on the frame-shaped seat frame and has a simple structure of supporting the back cushion member on the frame-like back frame even in the backrest. This contributes to weight reduction and does not increase the manufacturing cost.

FIG. 1 is a perspective view showing an appearance of a chair for four persons according to one embodiment of the present invention. FIG. 2 is a perspective view showing a seat frame, a back frame, and legs of the chair shown in FIG. FIG. 3 is a plan view of FIG. FIG. 4 is a side view of FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is an exploded perspective view of a chair for three persons according to one embodiment of the present invention. FIG. 7 is a diagram for explaining the operation of the chair shown in FIGS. 1 to 6. FIGS. 8A and 8B are diagrams showing evaluation results using a ride comfort evaluation method. FIG. 9 is a diagram showing the measurement result of the body pressure distribution when the subject D is seated in the normal posture. FIG. 10 is a diagram showing measurement results of body pressure distribution when the subject N is seated in the normal posture. FIG. 11 is a diagram showing measurement results of body pressure distribution when the subject H is seated in the normal posture. 12 (a) to 12 (c) are diagrams showing measurement results of body pressure distribution when the subjects D, N, and H are seated in the forward bending posture. FIG. 13 is a diagram in which the relationship between the pressure at the time of sitting and the time during which sitting can be performed stably (load time) is examined. FIG. 14 is a perspective view showing the appearance of a chair for one person according to another embodiment of the present invention. 15 is a cross-sectional view taken along line AA in FIG. 16 is a perspective view showing a seat frame and a back frame of the chair shown in FIG. FIG. 17 is a side view of FIG. FIG. 18 is a diagram showing a load-deflection characteristic according to an example of the seat base net.

  Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. The chair 1 according to the present embodiment includes a seat portion 10, a backrest 20, and leg portions 30. In addition, the chair 1 of this embodiment should just be the structure which the side frame 113,114 for seat parts of the seat part frame 11 falls forward, and it is easy to urge a buttocks to the front upper direction so that it may mention later. Although it may be for hanging, or it may be a chaise longue type for two or more people, in the present embodiment, a case for plural people will be described as an example.

  1 to 5 show examples of a four-seater configuration, and FIG. 6 shows an example of a three-seater configuration. 1 to 5 and the three-seat chair 1 shown in FIG. 6 have four seats for the seating space 1 a provided in the width direction of the seat 10 and the backrest 20. In contrast, the structure is exactly the same except that the latter is for three people. Therefore, in the following description, unless otherwise specified, a four-seat or three-seat diagram will be described as one embodiment without distinction.

  The seat portion 10 includes a seat portion frame 11 and a seat cushion member 12. The seat frame 11 is formed in a substantially rectangular frame shape, and has a length corresponding to four seats in FIG. 2 (length in the width direction of the chair 1), and a length corresponding to three seats in FIG. Have A front frame 111 is disposed at the front portion of the seat portion 10, and a rear frame 112 is disposed behind the seat portion 10 at a predetermined interval with respect to the front frame 111, and the front frame 111 and the rear frame 112 are arranged. Seat side frames 113 and 114 are disposed between the respective ends in the longitudinal direction.

  The backrest 20 includes a backrest frame 21 and a backrest cushion member 22. The back frame 21 includes side frames 213 and 214 for backrests located on both sides in the longitudinal direction (the width direction of the chair 1), and an upper frame 211 that connects the upper portions of the side frames 213 and 214 for backrests. It is formed in a substantially U-shaped frame shape. The lower portions of the backrest side frames 213 and 214 are connected to the rear portions of the seat side frames 113 and 114. Accordingly, the upper frame 211 has a length corresponding to the front frame 111 and the rear frame 112 of the seat frame 11 (length in the width direction of the chair 1). Also, each of the backrest side frames 213 and 214 is disposed so as to be inclined rearward and downward so that the upper part is located rearward of the lower part when viewed from the side. Therefore, when the back cushion member 22 is disposed along the back side frames 213, 214, the back angle θ2 (the surface of the seat cushion member 12 and the back cushion with the upper portion positioned rearward with respect to the vertical line). Centering on the boundary point D1 with the surface of the member 22, the structure has a vertical line and an angle formed by a virtual line passing through the upper edge portion U1 of the surface of the cushion member 22 for backrest. The back angle θ2 is preferably in the range of 8 to 35 degrees rearward with respect to the vertical line, and more preferably in the range of 17 to 27 degrees, as shown in FIG. Set by. This point will be further described later.

  The leg portion 30 includes main leg portions 31 and 31 provided on both sides in the longitudinal direction of the seat frame 11 (the width direction of the chair 1), and auxiliary leg portions 32 disposed between the main leg portions 31 and 31, respectively. have. The main leg portions 31 and 31 include front leg portions 31a and 31a that are arranged substantially vertically, rear leg portions 31b and 31b that are inclined forward toward the upper portion, lower portions of the front leg portions 31a and 31a, and rear leg portions 31b and 31b. And connecting members 31c and 31c for connecting the lower portions of the two. The main leg portions 31, 31 are connected to the front leg portions 113 a, 114 near the front portions of the front leg portions 31 a, 31 a, respectively, and the rear leg portions 31 b, 31 b are connected to the seat side frames 113, 114, respectively. 114 are connected to the vicinity of the rear part of the vehicle.

  Each of the main leg portions 31, 31 is formed with a length such that the upper ends of the rear leg portions 31 b, 31 b are higher than the upper ends of the front leg portions 31, 31. 4, 5, and 6, the height of the front frame 111 is lower than the height of the rear frame 112, that is, each connecting the front frame 111 and the rear frame 112. The seat side frames 113 and 114 are provided so as to be inclined downward.

  Accordingly, when the seat cushion member 12 is disposed along the seat frame 11, the seat cushion member 12 has a front lowering seating angle θ1 (for the seat portion) where the front portion is positioned below the rear portion. The angle between the horizontal line and the imaginary line passing through the front edge F1 of the surface of the cushion member 12 for the seat, centering on the boundary point D1 between the surface of the cushion member 12 and the surface of the back cushion member 22. Become. The front-lowering bearing surface angle θ1 (see FIG. 7) is preferably 2 to 25 degrees, and more preferably 5 to 20 degrees. Details will be described later.

  Here, the seat frame 11 is further slightly rearward in a side view than the front frame 111, and when the seated person sits back with the backrest 20 seated (when sitting in a normal posture) A front auxiliary frame 115 is disposed in parallel with the front frame 111 within a range of 100 to 150 mm forward from the designed load center portion corresponding to the nodule (see FIG. 3). Further, a rear auxiliary frame 116 is disposed below the rear frame 112 and slightly forward in front of the rear frame 112 and at a lower position than the front frame 111 and the front auxiliary frame 115. (See FIG. 3). The front auxiliary frame 115 prevents front-end slipping, and the rear auxiliary frame 116 increases supportability from the rear of the buttocks.

  In addition, the seat boundary frame 117 located between the adjacent seating spaces 1a and 1a is three in the case of four-seater in FIG. 2, and two in the case of three-seater in FIG. Thus, it is stretched between the front auxiliary frame 115 and the rear auxiliary frame 116 in a posture substantially parallel to the seat side frames 113 and 114. Therefore, the seat boundary frame 117 is provided such that the front side is high and the rear side is low. This is to give the seated person a sense of stroke when seated on the cushion member 12 for seat.

  The backrest frame 21 includes three backrest boundary frames 217 positioned between the adjacent seating spaces 1a and 1a between the backrest side frames 213 and 214, and three in FIG. In the case of hanging, the two pieces are arranged at substantially equal intervals and in a posture that is substantially parallel to the backrest side frames 213 and 214. Therefore, the backrest boundary frame 217 is arranged on the same straight line as the seat boundary frame 117 in plan view, with the upper portion being the upper frame 211 of the backrest frame 21 and the lower portion being the seat boundary frame 117. It is connected to and supported by the rear part.

  In the case of the four-seat seat shown in FIG. 2, the seat-side border frame 117 corresponds to the central seat-side border frame 117. In the case of the three-seat seat shown in FIG. Auxiliary legs 32 are provided.

The seat cushion member 12 includes a seat base net 121, a seat intermediate cushion 122, and a seat trim cushion 123. The seat base net 121 is formed in a substantially square shape from a two-dimensional fabric or a three-dimensional fabric. As shown in FIG. 5, the front portion of the skin 123 a of the seat trim cushion 123 is the front frame 111. Is attached to the upper surface of the front auxiliary frame 115 and fixed.
The lower part 221b, 222b of the belt-shaped backrest side base net 221 of the back cushion member 22 and the belt-shaped backrest central base net 222 are connected to the rear portion 121b of the seat base net 121 by sewing. The lower portions 221b and 222b are wound around the rear frame 112 from the upper surface and fixed. That is, the rear portion 121b of the seat base net 121 is pulled and stretched rearward by the backrest side base net 221 and the backrest central base net 222 (see FIG. 5). The upper portions 221 a and 222 a of the backrest side base net 221 and the backrest central base net 222 are fixed to the upper frame 211 of the backrest frame 21. In other words, the seat base net 121 is configured such that the rear part is suspended and supported by the upper frame 211 by the belt-like side base net 221 for the backrest and the central base net 222 for the backrest. It is easy to follow various postures. In addition, it is unlikely that a seating shock is given to the next person, and the seating spaces 1a, 1a for two people can be used by one person.

  With these configurations, as shown in FIG. 5, the seat base net 121 is positioned so that the front portion 121a is positioned lower than the rear portion 121b, that is, the seat portion side of the seat frame 11. It is disposed so as to be forwardly lowered substantially parallel to the surfaces of the frames 113 and 114.

  Further, as shown in FIG. 6, the rear part 121b of the base net 121 for the seat part has a shape in which the rear intermediate part 121d therebetween protrudes rearward rather than the rear side edges 121c and 121c. . Of these, the belt-like side base nets 221 and 221 for the backrest are connected to the rear side edges 121c and 121c, respectively, and the two belt-like central base nets for the backrest are respectively attached to the rear middle portion 121d protruding further rearward. Connected. Therefore, as shown in FIG. 6, since the lower part of the back base side base nets 221 and 221 protrudes in front of the central base net 222 for the backrest, the trunk of the seated person is the central base for the backrest. The vicinity of the spinal column is supported at a deep position by the net 222, and the body side support in which both side portions of the body are supported by the back base nets 221 and 221 for the back is enhanced.

The side base nets 221 and 221 for the backrest, the central base net 222 for the backrest, and the base net 121 for the seat portion are formed of a two-dimensional fabric or a three-dimensional fabric. As these base nets 121, 221, and 222, those having surface rigidity of a predetermined level or more in a state of being stretched on the seat frame 11 or the back frame 21 are used. For example, the load having a surface rigidity of more than a predetermined value is a load when the seat frame 11 is stretched without being slackened and pressurized to 1000 N with a pressure plate having a diameter of 200 mm substantially corresponding to the buttock area. -In a deflection characteristic, the thing in which the spring constant at the time of pressurization of the range of 400-750N which is an average load at the time of a person's seating becomes the range of 50-80N / mm is preferable. That is, if the spring constant is lower than this, and the spring constant is easy to extend even if the load value is small, the sinking of the base net 121 for the seat portion becomes large. For example, FIG. 18 shows data of a two-dimensional fabric of product number Y27013NP manufactured by Asahi Kasei Corporation. The spring constant at the time of pressurization in a load range of 400 to 750 N is about 70 N / mm. The material is suitable for the base net 121 for the seat. Then, the base net 121 for the seat is used by applying a tension of 6 to 12% to the natural length of the seat frame 11.
In this embodiment, since the synthetic resin thin plate 22a is laminated on the seat intermediate cushion 122 as described later, the seat base net 121 is, for example, woven or knitted using elastic fibers. Even with the use of “banex (registered trademark)” manufactured by Kawashima Textile Cellcon Co., Ltd., 3D solid knitted fabric “FUSION (registered trademark)” manufactured by Asahi Kasei Fibers Co., Ltd., 3D solid knitted fabric manufactured by Sumie Textile Co., Ltd. The sinking due to the seating load does not increase.

  The seat intermediate cushion 122 is not limited as long as it has a predetermined thickness and has a predetermined cushioning property. For example, it may be formed from polyurethane foam, but it is preferable to use a three-dimensional fabric from the viewpoints of air permeability and drainage. Among them, body pressure dispersibility is high, and a predetermined cushioning property can be obtained even when thin. It is preferable to use a three-dimensional solid knitted fabric.

  In this embodiment, the seat intermediate cushion 122 is formed by laminating two three-dimensional solid knitted fabrics. In this embodiment, a synthetic resin thin plate 122a made of polypropylene or the like having a thickness of about 1 mm is further laminated. By laminating the synthetic resin thin plate 122a, the body pressure dispersibility can be further enhanced.

  A seat trim cushion 123 is disposed so as to cover the intermediate cushion 122 for the seat, and in this embodiment, the surface of the synthetic resin thin plate 122a. The seat trim cushion 123 includes a skin 123a, a three-dimensional fabric integrally provided on the back surface thereof, and a skin cushion material 123b made of a three-dimensional solid knitted fabric in this embodiment. As the skin 123a, synthetic leather, genuine leather, fabric, two-dimensional cloth, three-dimensional cloth, or the like can be used.

  In this embodiment, after the seat trim cushion 123 is arranged in this way, the front edge of the skin 123a is fixed to the front frame 111 via a hook-and-loop fastener. In addition, when a hook-and-loop fastener is used, the elasticity of the loop part and hook part which comprise them functions as a restoring force with respect to the movement of the trim cushion 123 for seat parts. Moreover, the seat cushion material 12 is disposed for each seating space 1a, and four seat cushions 12 in the example of FIGS. 1 to 3 and three in the example of FIG. 123 are mutually connected by a fastener (not shown). Each outer edge of the seat trim cushion 123 located at both ends in the width direction is connected to the covering cover 40 by a fastener (not shown). As shown in FIG. 6, the covering cover 40 is substantially L in a side view covering the side frames 113 and 114 for the seat part of the seat part frame 11 and the side frames 213 and 214 for the back part of the back frame 21. A character-shaped side cover portion 41 and a back cover portion 42 provided at a position spanned between the back surfaces of the side cover portion 41 and having an upper portion fixed to the upper frame 211 and covering the back surface of the back frame 21 are provided. ing.

  The back cushion member 22 includes a backrest intermediate cushion 223 and a backrest trim cushion 224 in addition to the belt-like side base net 221 for the backrest and the central base net 222 for the backrest (FIGS. 5 and 5). 6). In addition, a widthwise belt-like member 225 is laminated on the belt-like side base net for backrest 221 and the belt-like center base net for backrest 222 (see FIGS. 1 and 5). The width-direction belt-like member 225 has a structure in which an elastic member 225b made of a belt-like rubber or the like is laminated on a two-dimensional or three-dimensional fabric, in this embodiment, a two-dimensional fabric 225a, and a support near the waist is formed by the elastic force. Arranged to enhance the performance.

  The backrest intermediate cushion 223 is formed in a substantially rectangular shape having a length from the upper frame 211 to the vicinity of the rear portion of the seat cushion member 12, and is disposed for each seating space 1a. As the material, the same material as the seat intermediate cushion 122 can be used, and it is preferable to use a three-dimensional solid knitted fabric. Is provided with a lumbar support cushion 223a (see FIG. 5). A synthetic resin thin plate 223b made of polypropylene or the like having a thickness of about 1 mm is further laminated on the surface of the backrest intermediate cushion 223, as in the case of the seat intermediate cushion 122, to enhance body pressure dispersibility.

  Like the seat trim cushion 123, the backrest trim cushion 224 includes an outer skin 224a, a three-dimensional fabric integrally provided on the back surface thereof, and in this embodiment, an outer skin cushion material 224b made of a three-dimensional solid knitted fabric. Have. The upper edge of the skin 224a is fixed to the upper frame 211 with a hook-and-loop fastener or the like, and the adjacent backrest trim cushions 224 are connected to each other by a fastener (not shown). The outer edges of the backrest trim cushions 224 located at both ends in the width direction are connected to the covering cover 40 by fasteners (not shown). These points are the same as the seat trim cushion 123.

  Since the chair 1 of the present embodiment has such a configuration, the seating stroke can be reduced, and the posture is not easily lost. As shown in FIG. 7, when not seated, the seat surface angle θ1 of the seat cushion member 12 of the seat portion 10 is counterclockwise about D1 with respect to the horizontal line as described above. The back angle θ2 of the backrest cushion member 22 of the backrest 20 is preferably set to a range of 2 to 25 degrees, more preferably 5 to 20 degrees. The rearward angle is preferably set in the range of 8 to 35 degrees, more preferably in the range of 17 to 27 degrees. As a result, an imaginary line that passes through the front edge F1 of the surface of the seat cushion member 12 around the boundary point D1 between the surface of the seat cushion member 12 and the surface of the back cushion member 22, and the back portion An angle formed by an imaginary line passing through the upper edge U1 of the surface of the cushion member 22 (in this specification, an angle defined in this way is referred to as a “back seat angle”) θ3 is preferably set when not seated. Is set in the range of 100 to 150 degrees, more preferably in the range of 110 to 140 degrees. The posture that facilitates smooth breathing and allows easy sitting is preferably 105 degrees or more in terms of the angle between the femur and the spine, and the optimum angle is said to be 135 degrees. According to the present embodiment, since the back seat angle is in the above range, it is suitable for maintaining this comfortable sitting posture.

  Further, the height difference H1 between the boundary point D1 between the surface of the cushion member 12 for the seat portion and the surface of the cushion member 22 for the back portion and the front edge portion F1 of the cushion member for the seat portion is in the range of 20 to 120 mm. Is preferred. Moreover, it is preferable that height H2 from the installation surface of the front edge part F1 of the cushion member 12 for seat parts is provided so that it may become the range of 420-500 mm. The height H2 from the installation surface can be achieved by setting the height of the main leg portion 31 and the auxiliary leg portion 32.

  Of the above-described conditions, it is most important that the seat portion 10 is lowered forward and the back seat angle θ3 satisfies the above conditions, and then it is important to satisfy the conditions of the seat surface angle θ1 and the back angle θ2. . Furthermore, it is preferable that the height difference H1 between the front edge F1 and the boundary point D1 and the height H2 of the front edge F1 are preferably satisfied. By satisfying these conditions, the height B1 when the seat cushion member 12 is most depressed is equal to or greater than the height B2 of the lower portion of the front frame 111. In other words, an assumed design load is applied. So that the relationship between B1 and B2 becomes like this, the structure of the seat frame 11 described above, the material and tension of the seat base net 121 in the seat cushion member 12, or the seat cushion member 12 The material, tension, and the like of the intermediate cushion 122 for seat and the trim cushion 123 for seat are configured. This increases the load sharing ratio under the thigh when seated, enhances the function of dispersing body pressure, provides excellent follow-up to posture changes, assists to promote posture changes, and improves stand-up performance. Can be made.

  Assuming that the chair 1 is installed in a spectator seat such as an outdoor baseball field or a soccer stadium, when it rains, the seat surface angle θ1 is as described above. It doesn't collect on top, it flows down toward the front. Therefore, rainwater does not accumulate even if the skin 123a has no water permeability. Of course, if the skin 123a is a three-dimensional solid knitted fabric or the like, the rainwater is quickly drained downward through the gap between the skins 123a, so that the drainage of rainwater is further enhanced.

  When a person sits deeply on the chair 1 so that the back is attached to the back cushion member 22, the base net 121 for the seat extends around the portion corresponding to the sciatic nodule, and the cushion material 12 for the seat is correspondingly extended. Sinks a predetermined stroke. However, since the seating surface angle θ1 when not seated is more negative than the horizontal line as described above, the so-called sciatic tubericular portion of the buttocks is less depressed compared to a normal chair with a seating surface angle of 0 degrees or more. The pressure at the center of the thigh is not high, the femur rotates around the greater trochanter, and pressure is applied to the entire thighbone, resulting in excellent body pressure dispersibility. That is, compared with the height of the front frame 111 that supports the front thigh or the back of the knee, the height of the buttocks is supported at a position that is substantially the same or higher, and the position of the buttocks is lower than the back of the knee, A posture in which the thigh is bowed is avoided, and it is difficult to feel the front frame 111 and the front auxiliary frame 115 hitting the back of the knee. As a result, an uncomfortable feeling is suppressed from the thigh to the buttocks, and fatigue in sitting for a long time is reduced.

  In addition, since the buttocks are located between the front auxiliary frame 115 disposed in front of the front frame 111 and the rear auxiliary frame 116 positioned below the rear frame 112, the weir prevents the pelvis from moving forward. And can be seated stably without slipping. In the state where the backrest 20 is put on the back, the game has a predetermined back angle θ2 as described above and the back seat angle θ3 is large, so that the game can be watched in a relaxed state.

On the other hand, for example, when the position of the buttocks moves closer to the front frame 111 and becomes a posture close to the forward bending, when the position of the buttocks is close to the forward bending, the sinking amount of the cushion member 12 for the seat becomes small, and the position is also the seat. The front cushion member 12 is closer to the front. Even when sitting near the front, there is the front frame 111 and the front auxiliary frame 115, and the thighs are supported in the vertical direction around this surface, so that the butt slip is less likely to occur and sits stably. be able to. Further, since the load applied to the rear of the cushion member 12 for the seat portion is reduced, the seated person has a soft support feeling that is supported by the hand from the rear of the buttocks. Due to this forward leaning posture and breathing, a certain degree of tension is generated during relaxation, sympathetic nerve activity is likely to be enhanced, and switching between sympathetic nerves and parasympathetic nerves is likely to occur. That is, sympathetic nerves and parasympathetic nerves appear with a certain fluctuation, and in the fluctuation analysis of heart rate variability, this corresponds to 1 / f fluctuation, which helps to increase the concentration in watching.
FIG. 8 shows the number of riding comfort points evaluated according to the method disclosed in Japanese Patent Application Laid-Open No. 2012-251913 filed by Delta Touring Co., Ltd., in the front-rear direction and the vertical direction in a frequency band with high vibration sensitivity of the human body. The head acceleration response data is evaluated in consideration of the head acceleration response data in the frequency band highly relevant to the occurrence of motion sickness. Specifically, using a heart part oscillating wave (APW) collected from a biological signal measuring means in contact with the back, a frequency gradient time series waveform is obtained from a zero-cross time interval of the APW time series waveform, This frequency gradient time-series waveform is subjected to frequency analysis, and the obtained fluctuation waveform is logarithmically displayed on both axes. Focusing on this fluctuation waveform in frequency bands called ULF and VLF, a long period region (region around 0.003 Hz), a medium period region (region around 0.01 Hz), and a short period region (0.015 Hz to 0). .03 Hz area), the change of the slope of the approximate line is obtained for each unit time, and the degree of the change is defined as the number of riding comfort points. The degree of change is determined by the sign of the slope of the approximate line and the number of so-called branching phenomena between the three approximate lines. The score is calculated by taking into account the overall shape (the higher the number of break points, the higher the score) and the tendency-specific scores of the long period region, medium period region, and short period region in the graph.
FIG. 8 (b) is obtained for a sheet using a polyurethane foam having a thickness that is used in international aircraft, and has three break points in the overall shape, It can be evaluated that the sympathetic nerve activity is active and difficult to relax in a short period region. On the other hand, FIG. 8A shows the result of the same test performed by the same subject sitting on the chair 1 of the present embodiment, and the right shoulder of about 45 degrees at one break point as the overall shape. 1 / f fluctuation appears, and the score is as high as 9 points, which indicates that it is suitable for maintaining a moderate concentration while relaxing.

  In addition, when standing up to take a seat eagerly to watch the game or to take a seat off due to a break, the seat cushion member 12 with a small stroke will return to the seat angle θ1 when not seated. Therefore, by moving the weight forward by moving the center of gravity, a force to push up the buttocks works, and a quick rising operation can be performed.

(Experimental example)
9 to 11 are diagrams showing body pressure distributions in a normal posture in which the back is seated so as to be in contact with the cushion member 22 for the backrest, and shows measurement examples of three adult males. The subject N is a normal body type (FIG. 10), and the subject H is a thick body type (FIG. 11).
In the normal posture, the area of 55 g / cm ² or less in the seat portion 10 is about 87% for the subject D, about 88% for the subject N, and about 79% for the subject H. About 80% was a pressure value of 55 g / cm ² or less, and showed high body pressure dispersibility. In particular, the two subjects, D and H, generated pressure values of 55 g / cm ² or more not only near the sciatic nodule but also in the front of the thigh, which is also highly dispersible in body pressure. Is shown.
Here, FIG. 13 is a diagram in which the relationship between the pressure at the time of sitting and the time (loading time) during which the user can sit stably without feeling numbness or pain in the buttocks is examined. From this figure, it can be seen that in the case of a pressure of about 55 g / cm ² , the chair 1 of the present embodiment has an area of about 80 to 90% of 55 g / cm as described above. Since the pressure is less than cm ^2, it can be seen that it is suitable for long-term seating where fatigue does not easily occur.

In the back (backrest 20), the pressure value of 55 g / cm ² or less is almost all, indicating that the load concentration is extremely small and the relaxability is high.

  FIGS. 12A to 12C are views showing body pressure distributions when the subjects D, N, and H are seated in the forward bending posture of FIG. 7 with their backs separated from the back cushion member 22. In the forward bending posture, it can be seen that the body is firmly supported around the sciatic tuberosity.

  14 to 17 show a chair 1 'according to another embodiment of the present invention. The chair 1 'of this embodiment is for one person. Also in this embodiment, a seat portion 10 ′ in which a seat cushion member 12 ′ is supported by a frame-shaped seat frame 11 ′, and a backrest 20 ′ in which a backrest cushion member 22 ′ is supported by a backrest frame 21 ′. It is the same as that of the said embodiment by having. Preferable ranges such as the seat portion 10 'being forwardly lowered, the seat surface angle θ1, the back angle θ2, the back seat angle θ3, the height difference H1 between the front edge portion F1 and the boundary point D1, the height H2 of the front edge portion F1, etc. Are all the same as in the above embodiment.

  Also in the present embodiment, the seat frame 11 ′ includes a front frame 111 ′, a rear frame 112 ′, and left and right side frames 113 ′ and 114 ′, and a front auxiliary frame 115 ′ for preventing a bottom shift is disposed. Has been configured. The front frame 111 ′ is disposed so as to be at a position lower than the rear frame 112 ′.

  As shown in FIG. 15, the seat base net 121 ′ constituting the seat cushion member 12 ′ is looped around the front frame 111 ′ and the rear frame 112 ′. Covering the surface of the base net 121 'is a seat trim cushion 123'. In addition, although the member equivalent to the intermediate cushion for seats of the said embodiment is not arrange | positioned between the base net 121 'for seats, and the trim cushion 123' for seats, it arrange | positions suitably as needed. Of course it is good.

  The seat cushion member 12 'of the present embodiment has two layers with a gap between the front surface portion and the back surface portion because the seat base net 121' is looped around. ing. Although it is the same as that of the said embodiment, the point which is designed so that height B1 when it sinks with the most load at the time of sitting becomes more than height B2 of the lower part of front frame 111 'is the same as the said embodiment. Since the base net 121 ′ has a two-layer structure, the seat base net 121 ′ has a high cushioning property, can firmly support a human load, and suppresses a feeling of bottoming. Therefore, it is more suitable for the VIP seat than the above embodiment of the present embodiment.

  The back frame 21 ′ is also formed in a frame shape, and includes a back frame 213 ′ and 214 ′ disposed on the left and right of the upper frame 211 ′, the lower frame 212 ′, the upper frame 211 ′, and the lower frame 212 ′. Is done.

  The back cushion member 22 ′ includes a back base net 221 ′ and a back trim cushion 224 ′, and the back base net 221 ′ is stretched between the upper frame 211 ′ and the lower frame 212 ′. Yes. Further, in the vicinity of the waist, a width-direction belt-like member 225 'is stretched between the backrest side frames 213'214' in the same manner as in the above embodiment. Further, in the present embodiment, the widthwise belt-like member 226 ′ is also stretched in the width direction also in the vicinity of the chest, and the backrest cushion member 22 ′ that supports the back is configured to have high cushioning properties. .

  The chair 1 ′ of the present embodiment is also set to a back seat angle θ 3, a seating surface angle θ 1, a back angle θ 2, and the like under the same conditions as in the above embodiment, and can maintain a posture suitable for watching games and is less susceptible to fatigue. At the same time, it is possible to easily change the posture from a deeply seated position to a shallowly seated position and to stand up.

1,1 'Chair 10, 10' Seat 11, 11 'Seat Frame 111, 111' Front Frame 112, 112 'Rear Frame 113, 114, 113', 114 'Seat Side Frame 115, 115' Front Rear auxiliary frame 116 Rear auxiliary frame 117 Boundary frame for seat 12, 12 ′ Cushion member for seat 121, 121 ′ Base net for seat 122, Intermediate cushion for seat 123, 123 ′ Trim cushion for seat 20, 20 ′ Backrest 21, 21 ′ Backrest frame 211, 211 ′ Upper frame 213, 214, 213 ′, 214 ′ Backrest side frame 217 Backrest boundary frame 22, 22 ′ Backrest cushion member 221 Backrest side base net 221 ′ Backrest base Net 222 Central base net for backrest G 223 Intermediate cushion for backrest 224, 224 'Trim cushion for backrest 225, 225', 226 'Band member 30 in width direction 30 Leg 31 Main leg 32 Auxiliary leg

Claims (11)

A chair with a seat and a backrest,
The seat portion includes a seat cushion member supported by the seat frame, and the front portion is formed with a front-lowering seating angle positioned below the rear portion with respect to the horizontal line,
A chair, wherein the backrest includes a cushion member for a backrest supported by a backrest frame, and has a predetermined back angle inclined backward with respect to a vertical line.   A back seat angle from a front edge portion of the seat cushion member to an upper edge portion of the back cushion member around a boundary point between the seat cushion member and the back cushion member is 100 to 150. The chair according to claim 1, which is in a range of degrees.   The chair according to claim 1 or 2, wherein the seating surface angle is set so that a front part is inclined with respect to the horizontal line in a range of 2 to 25 degrees below a rear part.   The chair according to any one of claims 1 to 3, wherein the back angle is set in a range of 8 to 35 degrees rearward with respect to the vertical line.   The height difference between a boundary point between the cushion member for the seat portion and the cushion member for the back portion and a front edge portion of the cushion member for the seat portion is in a range of 20 to 120 mm. The chair described in.   The chair of any one of Claims 2-5 provided so that the height from the installation surface of the front edge part of the said cushion member for seat parts may become the range of 420-500 mm. The seat frame includes a front frame having a predetermined length disposed at a front portion, a rear frame having a predetermined length disposed rearward at a predetermined interval with respect to the front frame, and the front frame. And is formed in a frame shape having a seat side frame spanned between each end of the rear frame,
The front frame, the rear frame, and the side frames for each seat portion are formed so that the front portion is positioned below the rear portion with respect to the horizontal line when viewed from the side. The chair of any one of -6.   8. The height according to claim 1, wherein the height when the seat cushion member is most depressed is equal to or higher than a height of a lower portion of the front frame. Chair.   The seat cushion member includes a seat base net made of a two-dimensional or three-dimensional fabric, and the seat base net is stretched over the seat frame. 1. The chair according to 1. The backrest, the backrest frame is formed in a frame shape,
The cushion member for the backrest is
A belt-like side base net for the backrest that is spanned up and down on both sides of the backrest and whose lower part is connected to the rear part of the base net for the seat part
Between the two backrest side base nets located on both sides of the backrest, it has one or more belt-like central base nets for the backrest that are stretched over the backrest frame,
The lower part of the central base net for the backrest is connected to the rear part of the base net for the seat part so that the lower part of the central base net for the backrest is located behind the lower part of the side base net for the backrest when viewed from the side. The chair of any one of -9.    The chair according to claim 10, wherein elastic members for supporting a waist are stacked along a width direction of the backrest that is a direction substantially orthogonal to the side base net for the backrest and the central base net for the backrest.