JP2000253946A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which sufficiently supports the upper part of the body without giving burden on the back. SOLUTION: A front part of a seat surface 2 is formed as a horizontal surface 5, and a back part is formed as an inclined surface 6 downward. A backrest surface 3 is inclined backward in three stages, an inclination surface 7 at a lower part abuts to the lower back of a seated person up to the pelvis, an inclination surface 8 at a middle part abuts to the back up to the shoulders, an inclination surface 9 at an upper part abuts to the neck and the back part of the head, and the angles of the inclination surfaces 7, 8, 9 are set to be larger at the upper part than the lower part, and larger at the middle part than the upper part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair, and more particularly to a chair that can be comfortably seated without giving a burden to the waist.

[0002]

2. Description of the Related Art There is a chair in which a seat portion and a backrest portion are devised to improve sitting comfort. As for the seat,
There are ones in which the entire seat surface is inclined in the front-rear direction, or one in which a recess is provided in the center of the seat surface. Regarding the backrest portion, various types have been proposed in which a backrest surface is inclined rearward, or in which a concave portion or a convex portion having a curved shape corresponding to the back to be abutted is formed in a horizontal direction or a vertical direction.

[0003]

In the above-mentioned conventional chair,
The inclination of the seat portion and the inclination of the backrest portion were vague, and there was no clear relationship between them. Even if the angle was adjusted, the entire inclination angle was simply adjusted. The present invention has been made in view of the above points, and an object of the present invention is to provide a chair that sufficiently supports the upper body and does not place a burden on the lower back.

[0004]

According to the present invention, the front portion of the seating surface is a horizontal surface, the rear portion is a downwardly inclined surface, the backrest surface is inclined backward in three steps, and the lower inclined surface is provided. Is in contact with the waist up to the pelvis of the seated person, the middle slope is in contact with the back up to the shoulder, the upper slope is in contact with the neck to the back of the head, and the angle of each slope is greater at the top than at the bottom , The middle part being larger than the upper part.

[0005] Further, the inclination angle of the seat surface to the lower rear portion with respect to the horizontal plane is 10 degrees, the inclination angle of the backrest surface to the lower rear portion with respect to the vertical surface is 5 degrees, the inclination angle to the rear of the middle portion is 15 degrees, and the upper rear portion is inclined. It is optimal to set the inclination angle to 10 degrees, and each inclination angle can be set within a range of plus or minus 2.5 degrees. It is also desirable to provide a projection for supporting the great occipital ridge on the upper inclined surface. Further, each leg has a ground contact surface located outside the contour line immediately below the seat surface.

When seated deeply on the seat surface, the upper body naturally comes into contact with the backrest surface due to the inclination of the rear part, and also prevents the body from sliding forward, and when seated shallowly, the upper body moves rearward on the horizontal plane at the front. Since the upper body can be easily tilted forward without leaning, there is no problem with desk work or the like.

Also, as described above, the waist, back and head contacting the backrest surface, as described above, the center of gravity of the upper body acts rearward due to the rear inclination of the seat surface, and naturally comes into contact with the backrest surface.
The waist has a lower slope, the back has a middle slope, and the head has a three-step slope so that it hits the upper slope, so the weight of each body part is supported and received by each slope. It works.

[0008] The inclination of the backrest surface is such that each part can be individually supported in three stages of inclination, and the inclination angle at which the body comes into contact with each inclined surface in a natural manner is set. Is what you do.

The weight of the lower body of the user as a chair is received by the seat, the body of the upper body is received by the back surface, and the back surface is inclined backward from the seat surface. Each of the legs is provided with a ground contact surface outside the seat surface to obtain a stable bearing action.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention, and a chair 1 is formed by a seating surface 2, a backrest surface 3, and four legs 4, 4, 4, 4.

The seating surface 2 has a front half portion formed of a horizontal surface 5 and a rear half portion formed of an inclined surface 6 inclined downward with respect to the horizontal surface. Therefore, if the user sits down using the front horizontal surface 5, it is in a normal chair state, and if the user sits down using the rear inclined surface 6, it is urged to shift to the rear, which naturally tilts. The body falls down and the waist, back, and head hit the backrest surface 3 to stabilize. In addition, since the seat is inclined downward, the occupant does not slide forward. The inclination angle D for the second half is optimally 10 degrees, and can be set within a range of plus or minus 2.5 degrees.

The backrest surface 3 is formed as a surface which is inclined rearward as a whole and has different inclination angles in three stages. The lower inclined surface 7 abuts the waist up to the pelvis of the seated person,
The middle inclined surface 8 contacts the back to the shoulder, and the upper inclined surface 9 contacts the neck to the back of the head.

The angle C of the upper inclined surface 9 is larger than the angle A of the lower inclined surface 7 and the angle of the upper inclined surface 9 is larger than the angle C of the upper inclined surface 9 with respect to the vertical surface. Is set to be large, and the angle A of the lower inclined surface 7 is set.
The optimum angle is 5 degrees, the angle B of the middle inclined surface 8 is 15 degrees, and the angle C of the upper inclined surface 9 is 10 degrees. In addition, the condition of the angle of the inclined surface of each part is maintained, and ± 2.5
It can be set within a range of degrees.

Since the backrest surface 3 has three different slopes, the weight of the waist, back, and head of the occupant can be individually received and supported on each sloping surface. This eliminates the need to support the weight with the waist, prevents the lower back from being disturbed by sitting, and provides a stable and comfortable chair.

Legs 4, 4, 4, and 4 provided from the lower surface of the seating surface 2
Numeral 4 extends from the corner of the seating surface 2 and contacts with the floor or the like.
Reference numerals 0, 10, and 10 are located outside the contour line immediately below the seating surface, so that the inclined backrest surface 3 can be supported sufficiently stably even when the seated person's weight is applied. Each leg 10, 10, 10, 10 may extend linearly, arcuately, or any other shape outwardly from just below the seating surface.

FIG. 3 shows a structure in which a projection 11 is provided on the upper inclined surface, and the projection 11 bears against the lower part of the large occipital ridge of the occupant to support the weight of the head.

[0017]

As described above, in the chair according to the present invention, the upper body of the occupant is lifted by the specific relationship between the inclined surface provided on the seat surface and the three-stage inclined surface provided on the backrest surface and each inclined surface. Since it is dispersed and stably supported and held on the seat surface and the backrest surface, the burden on the waist can be reduced and a comfortable chair can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a chair of the present invention.

FIG. 2 is a plan view showing an embodiment of the chair of the present invention.

FIG. 3 is a partial side view showing another embodiment of the backrest surface.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 chair 2 seating surface 3 backrest surface 4 legs 5 horizontal surface 6 inclined surface 7 lower inclined surface 8 intermediate inclined surface 9 upper inclined surface 10 contact surface 11 protrusion A, B, C, D angle

Claims (5)

[Claims] 1. A front surface of a seating surface is a horizontal surface, a rear portion is a downwardly inclined surface, and a backrest surface is inclined rearward in three steps, and a lower inclined surface is a waist to a pelvis of a seated person. And the middle slope is in contact with the back to the shoulder, the upper slope is in contact with the neck to the back of the head, and the angle of each slope is larger at the top than at the bottom and larger at the middle than at the top A chair characterized by the following. 2. The angle of inclination of the seat surface to the lower rear portion with respect to the horizontal plane is 10 degrees, the angle of inclination of the backrest surface to the lower rear portion with respect to the vertical surface is 5 degrees, the angle of inclination to the rear of the middle portion is 15 degrees, and the upper portion to the upper rear portion. The chair according to claim 1, wherein the inclination angle of the chair is 10 degrees. 3. The chair according to claim 1, wherein each of the inclination angles is set within a range of ± 2.5 degrees. 4. The chair according to claim 1, wherein the upper inclined surface has a projection corresponding to the lower part of the great occipital ridge. 5. The chair according to claim 1, wherein the ground contact surface of each leg is located outside the contour line immediately below the seat surface.