JPH10295480A - Legless chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a legless chair in which one can maintain a posture out of a variety of postures for long hours without being tired and in which one can easily change one's posture occasionally in a comfortable direction. SOLUTION: A legless chair 10 is equipped with a seat 12, backrest 14 and a protrusion 24. The protrusion 24 is formed uniformly in the width direction at the boundary between the seat surface 20 of the seat 12 and the backrest surface 22 of the backrest 14. The protrusion 24 supports one's lumbar vertebrae when one sits and has a dimension sufficient enough to the extent so that one can put one's head over when one lies down. The bottom plane 16 of the seat 12 becomes flat and the back plane 18 of the backrest 14 becomes flat vertical to the bottom plane 16 of the seat 12. Further, the angle between the seat surface 20 of the seat 12 and the backrest surface 22 of the backrest 14 is fixed at 110 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair.

[0002]

2. Description of the Related Art There has been a seat chair as a tool for supporting a person's body in a sitting posture and relaxing the person. A seating chair is mainly composed of a seating portion that sits down when a person sits down and a backrest portion that supports the back, and is used by placing it on the floor.

[0003] Recently, it has been known to use a pipe or a steel frame material to adjust the angle between the seating surface and the backrest surface and to cope with various postures.

[0004]

The conventional seat chair can support the buttocks and the back of the person if the person only sits for a short time, so that the person can be rested or moderately relaxed. It is a very useful tool. However, when a person sits for a long time, the weight is concentrated on the waist and the back, so that the burden is placed on the waist and the back, and protective measures such as stretching the waist and the back regularly are required.

In addition, if a person sits in a sitting chair for a long time in a sitting position, the necessity of stretching his / her waist and back arises for the above-mentioned reasons, so that it is common to lie on a chair and stretch his / her waist and back. . However, lying on the chair is not the original use of the chair, so if you press down your neck on the seat and lie down, your neck will be pressed by the backrest, placing a significant burden on your back and neck . If you use a chair that can adjust the angle between the seat surface and the back surface, it will be possible to cope with the lying position to some extent, but it will take time and effort to adjust the angle. At the same time, the chair itself becomes very unstable when lying down.

Accordingly, the present invention provides a seating chair which can maintain a posture without fatigue for a long time in various postures such as a sitting posture and a lying posture and can easily change the posture in a comfortable direction. The purpose is to provide children.

[0007]

In order to solve the above problems, a seat chair according to the present invention supports a part of a human body on a boundary between a seat surface of a seat and a back surface of a back portion. It is characterized by having a convex portion.

[0008] When the protruding portion is seated, the body pressure mainly on the ischial is relieved, and when it is lying down, the burden on the cervical vertebra is mainly relieved.

In the chair according to the present invention, the surface of the projection is substantially a part of the cylindrical surface, and the radius of curvature of the cylinder forming the cylindrical surface is 50.
It may be characterized in that it is within a range of 150 mm.

[0010] Since the projection has the above-mentioned shape,
The burden on the ischial bone and the cervical spine can be effectively reduced.

The chair of the present invention comprises a main body, a first layer formed on the upper part of the main body, and a second layer formed on the first layer. The second layer is formed from a foam material that is soft compared to the body, and the first layer is
It may be characterized by being formed of a foam material that is softer than the main body and has a lower rebound resilience than the second layer.

By inserting a first layer made of a foam material having a low rebound resilience between a main body made of a hard material and a second layer made of a soft foam material, body pressure is dispersed and The burden is not concentrated on a part of the body, and the whole body can be supported firmly.

The chair of the present invention may be characterized in that the main body is formed of a foam material.

By forming the main body from a foam material,
In addition to improving the sitting comfort of the chair, the overall weight is reduced,
It can be easily carried.

The chair of the present invention may be characterized in that the bottom of the seat is flat, and the back of the backrest is flat and perpendicular to the bottom of the seat.

By making the bottom surface of the seat flat, the chair can be stably placed on the floor. In addition, by making the back of the backrest flat and perpendicular to the bottom of the seat, it is possible to press and fix the chair against a wall, etc., and use the chair in a more stable state. Can be.

Further, the seat chair of the present invention may be characterized in that the angle between the seat surface and the back surface is in the range of 100 to 120 degrees.

The angle between the seat surface and the back surface is 100 to 1
By setting the range to 20 degrees, it becomes possible for a person to sit comfortably.

The chair of the present invention may be further characterized by further comprising an auxiliary cushion for supporting a person's foot.

[0020] By further providing an auxiliary cushion for supporting a person's foot, even if the foot comes off the seating surface of the chair, the pressure applied to the foot from the floor is reduced by the auxiliary cushion, and the seat is more comfortably seated. You can sit on a chair.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A chair according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a chair according to the first embodiment of the present invention. Illustrated chair 10
Has a seat 12 and a backrest 14. Seat 12
Is large enough to support the buttocks of a person, and similarly, the backrest 14 is large enough to support the back of the person. The bottom surface 16 of the seat 12 is flat, and the back surface 18 of the backrest 14 is flat and the seat 1
2 is perpendicular to the bottom surface 16. In addition, seat part 1
The angle formed by the second seat surface 20 and the backrest surface 22 of the backrest portion 14 is preferably in the range of 100 to 120 degrees, and more preferably 110 degrees.

At the boundary between the seat portion 12 and the backrest portion 14, a convex portion 24 is provided. The convex portion 24 is a chair 1
It extends with a substantially constant cross-sectional shape in the width direction of 0.
The convex portion 24 has a size large enough to support the lumbar spine of a person when the person sits down and put the head of the person when the person lies down. Further, the shape of the convex portion 24 is preferably a part of a substantially cylindrical surface having a radius of curvature of 50 to 150 mm, particularly 100 mm.

FIG. 2 is a sectional view of a chair according to the first embodiment of the present invention. As shown in FIG.
Is composed of a main body 26, a first layer 28, and a second layer 30.

The main body 26 is a base of the chair 10 and has sufficient rigidity to support a human body by itself. The material of the main body 26 is preferably made of a hard foam material because it has sufficient rigidity and is lightweight. Specifically, it is effective to pulverize a waste material made of a foamed material, put it in a mold after applying an adhesive, cure and dry it, and mold it into a hard chip mold. Because it is formed from waste materials, it is very economical and adapts to the trend of resource saving. Further, it becomes possible to lightly finish the whole chair. Further, the main body 26 has a seat portion 3 corresponding to the seat portion 12 of the chair 10.
2. An integrated structure having a backrest portion 34 corresponding to the backrest portion 14 and a convex portion 36 corresponding to the convex portion 24.

The first layer 28 and the second layer 30 function as a cushion. The first layer 28 is 30 mm
It is a layer having a uniform thickness to the extent that it is adhered to the main body 26 so as to cover the entire upper surface of the main body 26. The first layer 28 is preferably formed of a foam material having a low rebound resilience of 15% or less (according to JIS K6401). Examples of such a foam material having a low rebound resilience include a rebound resilience of 15% or less and a density of 60 ± 5.
kg / m ³ , hardness 5 ± 2 kgf (JISK 64
No. 01), color foam EGR-3, which is a flexible urethane foam manufactured by INOAC, and the like.

The second layer 30 is a layer having a uniform thickness of about 20 mm, and is adhered to the first layer 28 so as to cover the entire upper surface of the first layer 28. The second layer 30 also covers the front end of the seat 12 and the upper end of the backrest 14 so that the main body 26 does not directly hit the head or the foot. The second layer 30 has a hardness of 15 kgf.
It is preferably formed from the following soft foamed material (according to JIS K6401). Examples of such a soft foam material include a rebound resilience of 35% or less, a density of 18 ± 2 kg / m ³ , and a hardness of 11 ± 2 kgf (all JI
(According to SK6401)
Color foam ECT, which is a soft urethane foam manufactured by Company C, can be considered. As described above, since the second layer 30 has a flat plate shape formed of a soft foam material, the second layer 30 covers the front end of the seat portion 12 and the upper end of the backrest portion 14 so as to cover the seat portion 12. Tip and backrest 1
The upper end of 4 has a naturally rounded shape, increasing the comfort when a person sits down.

The first layer 28 and the second layer 30 are also easy to manufacture because they have a flat plate shape, and as a result, compared to the conventional seat chair manufacturing, The manufacture of the chair 10 according to the present embodiment is easy.

As described above, the chair 10 is composed of the main body 2.
6, the first layer 28 and the second layer 30 have a three-layer structure. The periphery is covered with a cover 38 to prevent the chair 10 from being stained and worn.

Next, the operation of the chair according to the first embodiment of the present invention will be described. The chair of this embodiment is
By having a uniform convex portion 24 in the width direction at the boundary between the seat portion 12 and the backrest portion 14, it is possible to easily sit or lie down in various postures and to sit down. It is possible to easily change the posture successively on the reference numeral 10.

FIGS. 3 to 5 show a state in which the sitting chair according to the present embodiment sits or lays down in various postures.

FIG. 3 is a view showing a state in which the user sits on the protruding portion 24 of the seating chair 10 so as to be in contact with the waist (hereinafter, posture A).
The posture A is a normal sitting position, for example, a posture at the time of drinking coffee or reading a book. When a conventional seat chair without the convex portion 24 is used, in the normal posture A, there is a space in the waist, so that the seat chair cannot support the lumbar spine, and the weight concentrates on the sit bone. As a result, when sitting for a long time, fatigue, pain, discomfort and the like are likely to occur around the ischial bone. However, when the seat chair according to the present embodiment is used, since the convex portion 24 supports the lumbar spine, the body pressure applied to the ischium is reduced.

FIG. 4 is a view showing a state in which the back is in contact with the projection 24 of the chair 10 (hereinafter referred to as posture B). The posture B is a posture that is more relaxed by lying down than the posture A, for example, a posture when watching TV. When the conventional seat chair is used, in the normal posture B, the point where the buttocks are in contact with the seat portion 12 and the back is the backrest portion 14.
To support the whole body at the two points where it touches, the body weight concentrates on the sacrum, lumbar spine, and scapula. Easy to occur. However, when the chair according to the present embodiment is used, since the convex portion 24 supports the thoracic vertebra, the body pressure applied to the sacrum, the lumbar spine, and the scapula is alleviated. Furthermore, in this position, the upper end of the backrest 14 supports the cervical spine,
This posture can be maintained more comfortably.

FIG. 5 is a view showing a state in which the head is lying down so that the neck hits the convex portion 24 of the chair 10 (hereinafter referred to as posture C). The posture C is a lying state, for example, a posture when taking a nap. When the conventional seat chair is used, in the normal posture C, the head is supported from the side by pressing the head against the backrest portion 14 in order to raise the head. Therefore, excessive force is applied to the occiput, scapula, thoracic vertebra, lumbar vertebra and sacrum.
The area around the scapula, thoracic vertebra, lumbar vertebra and sacrum is apt to cause fatigue, pain, discomfort and the like. However, when the seat chair according to the present embodiment is used, since the convex portion 24 supports the cervical vertebra and the head from below, it is possible to eliminate excessive force applied to the occipital region, scapula, thoracic vertebra, lumbar vertebra, and sacrum. it can.

The seat chair according to the present embodiment has a first resilient foam material between a main body 26 made of a hard foam material and a second layer 30 made of a soft foam material. By inserting the layer 28, the body pressure can be dispersed. Also, since the first layer 28 made of a foam material having a low rebound resilience deforms according to the shape of the body when sitting, the entire body can be provided without providing a bank or the like on both sides of the seat 12. It is possible to support firmly. Furthermore, since there is no need to provide a bank portion, it is possible to easily perform an action such as adjusting the sitting position by shifting the position of the buttocks.

The seat chair according to the present embodiment further has a flat bottom surface 16 of the seat portion 12 so that
The stability on the floor is very good. In addition, since the back surface 18 of the backrest portion 14 is flat and perpendicular to the bottom surface 16 of the seat portion 12, the back surface portion 18 of the backrest portion 14 is pressed against a wall or the like and fixed, so that the chair 10 can be further stabilized. It becomes possible.

In the chair according to the present embodiment, the angle between the seat surface 20 and the back surface 22 is in the range of 100 to 120 degrees, so that the comfort when sitting is increased.

Next, the effect of the chair according to the first embodiment of the present invention will be described. FIG. 6 shows a chair A according to the present embodiment and a chair according to the related art, posture A,
53 subjects were seated in each of the postures B and C, and several items such as less pressure on the buttocks and comfortable sitting were evaluated. This is a result of having a five-point evaluation performed so that one point is given for points and low evaluations. Note that, unlike the chair according to the present embodiment, the chair according to the related art used in the present evaluation was a chair having no protrusion and having a one-layer cross section. Also, the angle between the seat surface and the back surface is
The evaluation was performed with the angle fixed at 110 degrees as in the present embodiment.

In the posture A, the overall evaluation of the chair according to the present embodiment and that of the prior art were similar. However, the point where the hips are stable, the point where the seat is soft,
The evaluation of the point that the pressure on the buttocks is small, the point that the waist can be sufficiently supported, and the point that it fits on one's own body shows that the chair according to the present embodiment greatly exceeds the chair according to the prior art. It is concluded that the chair according to the embodiment is less likely to cause fatigue, pain, discomfort, and the like.

In the posture B and the posture C, the evaluation of the chair according to the present embodiment exceeds the evaluation of the chair according to the prior art in all the evaluation items, and the chair according to the present embodiment is evaluated. The use of a child allows for long periods of sitting or lying down without feeling tired or painful.

Next, a chair according to a second embodiment of the present invention will be described. The chair according to the present embodiment,
The difference between the seat and the chair according to the first embodiment in terms of configuration is as follows.
That is, the auxiliary cushion 40 for supporting the foot of the person is arranged on the seat 12 of the chair 10. Auxiliary cushion 40
Is large enough to support the entire leg of the person P in the sitting posture, and to support the buttocks and thighs of the person P in the lying position.

FIGS. 7 to 9 show a state in which a person P sits in various postures on the chair according to the present embodiment. FIG. 7 illustrates a state where the person P sits in the posture A on the chair according to the present embodiment. The functions and effects of the portion of the seat 10 other than the auxiliary cushion 40 are as follows.
This is the same as the operation and effect of the chair according to the first embodiment. In the chair according to the present embodiment, since the auxiliary cushion 40 supports the foot of the person P, particularly the calf and the heel, the pressure on the foot of the person P from the floor is reduced, and the chair 10 is more comfortable. It will be possible to sit down.

FIG. 8 shows a state where the person P sits in the posture B on the chair according to the present embodiment. In the posture B, as in the case of sitting in the posture A, the auxiliary cushion 40 is used.
To support the feet of the person P, especially the calves and heels,
The pressure on the foot of the person P from the floor is reduced, and it becomes possible to sit on the chair 10 more comfortably.

FIG. 9 shows a state in which the person P is lying in the posture C on the chair according to the present embodiment. In the posture C, since the auxiliary cushion 40 supports the buttocks and thighs of the person P, the pressure on the buttocks and thighs of the person P from the floor is reduced, so that the sitting chair 10 can be more comfortably seated. It becomes possible. Further, in this case, the auxiliary cushion 40 may be long enough to ride the calf and heel.

Next, a chair according to a third embodiment of the present invention will be described. FIG. 10 is a cross-sectional view of a chair according to a third embodiment of the present invention. The difference between the present embodiment and the chair according to the first embodiment is that the convex portion 36 is formed on the main body 26 in the first embodiment, but the second portion is used in the present embodiment. The point is that the convex portions 42 are formed on the layer 30 of FIG. The convex portion 42 is provided on the second layer 30.
Is formed, the convex portion 24 becomes soft, the feeling of pressure on the person P when sitting or lying down becomes smaller, and it becomes possible to sit or lie down comfortably.

Further, a chair according to a fourth embodiment of the present invention will be described. FIG. 11 is a sectional view of a chair according to a fourth embodiment of the present invention. The difference between the present embodiment and the chair according to the first embodiment is that
In the embodiment, the convex portion 36 is formed on the main body 26. However, in the present embodiment, the convex portion 44 is formed on the first layer 12. The convex portion 4 is formed on the first layer 12.
By forming 4, the rebound resilience of the convex portion 24 is reduced, and the feeling of close contact between the chair 10 and the person P when sitting or lying down is increased. It is possible to sit or lie on the floor.

Next, a chair according to a fifth embodiment of the present invention will be described. FIG. 12 is a sectional view of a chair according to a fifth embodiment of the present invention. The difference between the present embodiment and the chair according to the first embodiment is that
In the above embodiment, the convex portion 36 is formed on the main body 26. However, in this embodiment, a separate convex portion forming member 46 is manufactured, and the convex portion forming member 46 is combined with the main body 26 and the first layer. 28. By doing so, the step of forming a convex portion on the main body 26, the first layer 28 or the second layer 30 becomes unnecessary, and the manufacture of the seat 10 becomes easy. Further, the protrusion forming members 46 of various sizes are provided.
Are prepared, it is possible to easily manufacture various seats and chairs 10 having different sizes of the convex portions 24.

In each of the above embodiments, the protrusion 24
Is uniformly formed in the width direction of the chair 10,
Is large enough to support the waist, head, etc. of the seat chair 10 at the boundary between the seating surface 20 of the seat portion 12 of the seating chair 10 and the backrest surface 22 of the backrest portion 14. May be formed only at the central portion in the width direction of.

The material for forming the main body 26, the first layer 28 and the second layer 30 is not limited to the materials used in the above embodiments.

[0049]

By using the seating chair of the present invention, in various postures such as a sitting posture and a lying posture, even if sitting for a long time or lying down, it is possible to relax without being tired. Is possible, and the posture can be easily and sequentially changed to a comfortable direction without performing troublesome angle adjustment or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chair according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the chair according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state of a person and a chair when the person sits on the chair according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a state of a person and a chair when the person sits diagonally on the chair according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a state of a person and a chair when the person lies on the chair according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a result of a monitor test for comparing a seat chair according to the first embodiment of the present invention with a seat chair according to the related art.

FIG. 7 is a diagram illustrating a state of a person and a chair when the person sits on the chair according to the second embodiment of the present invention.

FIG. 8 is a diagram showing a state of a person and a chair when the person sits diagonally on the chair according to the second embodiment of the present invention.

FIG. 9 is a diagram illustrating a state of a person and a chair when the person lies on the chair according to the second embodiment of the present invention.

FIG. 10 is a sectional view of a chair according to a third embodiment of the present invention.

FIG. 11 is a sectional view of a chair according to a fourth embodiment of the present invention.

FIG. 12 is a sectional view of a chair according to a fifth embodiment of the present invention.

[Explanation of symbols]

10 ... seat chair, 12 ... seat, 14 ... backrest, 16 ...
Bottom, 18 back, 20 seat, 22 back, 2
4 Projection, 26 Body, 28 First layer, 30 Second layer, 32 Seat part, 34 Back part, 36, 4
2, 44: convex portion, 38: cover, 40: auxiliary cushion, 46: convex forming member, P: person

Claims (7)

[Claims] 1. A chair comprising a seat portion and a backrest portion, wherein at a boundary between a seating surface of the seat portion and a backrest surface of the backrest portion,
A seat chair having a convex portion for supporting a part of a human body. 2. The surface of the projection is a part of a substantially cylindrical surface, and a radius of curvature of a cylinder forming the cylindrical surface is 50 to 150 m.
The seat chair according to claim 1, wherein the range is m. 3. A second layer, comprising: a main body; a first layer formed on the main body; and a second layer formed on the first layer. Is formed of a foam material that is softer than the main body, and the first layer is softer than the main body and the second layer
The seat chair according to claim 1, wherein the seat chair is formed of a foam material having a low rebound resilience as compared with the layer of (1). 4. The seat chair according to claim 3, wherein the main body is formed of a foam material. 5. The seat according to claim 1, wherein a bottom surface of the seat portion is flat, and a back surface of the backrest portion is flat and perpendicular to the bottom surface. Chair. 6. The chair according to claim 1, wherein an angle between the seat surface and the back surface is in a range of 100 to 120 degrees. 7. The seat chair according to claim 1, further comprising an auxiliary cushion for supporting a person's foot.