JP2832705B2 - Sitting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sitting apparatus. More specifically, the present invention relates to a sitting device that reduces a feeling of pressure on the buttocks and thighs when sitting on a chair or the like, removes a force applied to the sacrum, and facilitates a forward leaning posture.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional chair and the state of vertebrae when a person sits on the chair. A conventional chair, especially a general office chair 9, comprises a seat 90 having a flat seating surface and an essentially horizontal or slightly rearward inclination, and a rearwardly or rearwardly inclined seat portion 90. It comprises a backrest portion 91 that can fall down, and a leg portion 92 supporting the seat portion 90 and the backrest portion 91. In some chairs, the back tilt angle of the backrest 91 can be adjusted. When the user sits on the chair 9, the weight is distributed between the seat 90 and the backrest 91.

[0003] When sitting on the above-mentioned conventional chair, since the seating surface is flat, it comes into contact with the curved buttocks and thighs in a small area, and the load applied per unit area is small. Is big. Therefore, when sitting for a long time, the buttocks and thighs become painful. In addition, as described above, since the entire chair is easy to take a backward tilted posture, when working toward a desk, the vertebrae 100 are curved as shown in the figure,
It is easy for the lower end 101 of the coccygeal bone to be in a posture in contact with the seating surface.
Therefore, if you work for a long time while sitting, you will hurt the coccyx.

Japanese Utility Model Laid-Open Publication No. 3-129352 discloses a sitting device having a shape of a butt that can hold the waist of a sitting person. According to this sitting apparatus, when sitting, the buttocks entirely contact the seating surface, and the pressure applied to the buttocks is dispersed by the enlargement of the contact surface. For this reason, it is relieved from pain in the buttocks caused by sitting for a long time.

Japanese Patent Application Laid-Open No. Hei 1-314565 discloses an opening having a substantially "T" shape from the posterior edge to the anterior edge in order to release mechanical stress and pain from the sacrococcyx of a sitting human. A seating device formed is disclosed. According to this sitting device, the pressure on the coccygeal bone is eliminated because the portion of the coccyx bone does not come into contact with the seating surface when the user sits down, thereby relieving the pain of the coccygeal bone caused by sitting for a long time.

[0006]

However, Japanese Utility Model 3
In the device described in JP-A-129352, no consideration is given to the thigh, and therefore, the feeling of pressure on the thigh and the pain of sitting for a long time have not been solved. Further, the structure described in Japanese Patent Application Laid-Open No. 1-314565 has a "T" shape opening, and the opening area is large as is apparent from the drawing. In addition, since the seating surface has a planar shape, in combination with the formation of the opening, the curved buttocks and thighs come into contact with a small area, and a large load is applied per unit area of the human body. . Therefore, when sitting for a long time, the buttocks and thighs become painful.

Further, in the conventional chair, as described above, the seat surface is essentially horizontal or slightly inclined backward, and the backrest is also inclined backward or falls backward. Therefore, when sitting on a conventional chair, the upper body of the human body basically assumes a backward leaning posture. When working toward the desk from the rearwardly inclined posture, it is necessary to take a posture in which the head and upper body are inclined forward, that is, a forwardly inclined posture.

[0008] As described above, when the user takes a forward leaning posture while sitting on a chair having a structure in which the upper body takes a backward leaning posture, the burden on posture holding muscles of the neck, shoulders, and back is increased. And increase muscle fatigue and decrease concentration.

The present inventor has conducted research on a suitable sitting posture so as not to cause an increase in muscle fatigue and a accompanying decrease in concentration when a person works while sitting, and has completed the present invention. Was.

Accordingly, an object of the present invention is to distribute the load applied to a human body per unit area when the user sits down, reduce the compressive force on the buttocks and thighs, and remove the compressive force on the sacral coccyx. Is to do. It is another object of the present invention to reduce the burden on the posture holding muscles by keeping the vertebrae in the proper position.

[0011]

According to a first aspect of the present invention, there is provided a sitting apparatus which reduces a feeling of pressure on the buttocks and thighs when sitting and removes a force applied to the sacral bone. The sitting device includes a concave portion in which a portion of the seat surface that comes into contact with the buttocks and thighs when sitting is formed substantially in accordance with the curved surface of the human body, And a hole formed so as to include a part of the concave portion, which is a contact portion.

According to a second aspect of the present invention, there is provided a sitting apparatus which reduces a feeling of pressure on the buttocks and thighs when seated, removes a force applied to the sacrum, and facilitates a forward leaning posture. The sitting device includes a concave portion in which a portion of the seat surface that comes into contact with the buttocks and thighs when sitting is formed substantially in accordance with a curved surface of a human body; A hole formed at a location where the tail bone abuts and including a part of the concave portion, wherein the concave portion is formed with a forward inclination angle of 2 to 6 ° with respect to a horizontal plane. A sitting device characterized by being.

According to a third aspect of the present invention, there is provided the sitting apparatus according to the first or second aspect, wherein the sitting apparatus is a chair or a mat having a required thickness.

The sitting device may be a chair or a mat having the required thickness. In the case of the mat shape, since the installation place is not limited, various uses are possible. The seat surface is usually formed of a material having a hard elasticity that does not cause excessive elastic deformation and that does not make the human body feel hard.

The hole is formed so as to exclude a portion of the seat surface where the sacrococcyx abuts when sitting. The hole may penetrate from the upper surface to the lower surface, or may be provided with a part of the upper surface depressed. The shape of the hole is not particularly limited, but it is preferable that the hole has a required minimum size without reducing the contact area with the buttocks as much as possible. From this viewpoint, it is formed to include a part of the recess.

The recess formed in the seat has a forward inclination of essentially 2 to 6 ° with respect to the horizontal plane. When the anteversion angle is less than 2 °, there is not much difference from the case where the seating surface is horizontal, and in a relaxed sitting state, the disappearance of the physiological lumbar lordosis of the lumbar spine is observed. Also, if you try to keep your posture by extending the spine, the posture holding muscles will be overwhelmed and fatigue will be severe. 6 ° forward tilt
Exceeding the upper limit makes it difficult to balance the upper body and increases the burden on the posture holding muscles of the neck, shoulders and back. In addition, lumbar lordosis is likely to occur. According to the results of the experiment, it seems that about 4 ° is good for Japanese with average physique (yellow race), in which case not only the physiological lordosis of the lumbar spine is secured but also the vertebrae It has been confirmed that the rigidity in the vertical direction is improved. In the case of Westerners (white race, black race), about 6 ° seems to be better.

The seating device according to the present invention has a concave portion in which a portion of the seat surface that comes into contact with the buttocks and thighs when sitting is formed substantially in accordance with the curved surface of the human body; And a hole formed by including a part of the concave portion, which is a portion where the coccyx abuts when sitting. Therefore, the contact area between the human body and the seating surface increases, whereby the load applied to the human body is dispersed, and the compressive force applied to the thighs and buttocks is reduced. No load is applied to the coccygeal bone. Therefore, pain and fatigue are reduced even when sitting for a long time.

Further, in addition to the above-mentioned structure, the above-mentioned concave portion is formed with a forward inclination angle of essentially 2 to 6 ° with respect to the horizontal plane, the drag applied to the pelvis and the ischial tuberosity and the sliding friction drag due to the inclination. It has been found that the pelvic upright angle can be maintained physiologically by this, so that the physiological lordosis of the vertebrae can be maintained in a proper state even in a relaxed state. Therefore, the burden on the posture holding muscles of the neck, shoulder, and back is alleviated, and fatigue of these muscles can be reduced.

A mat-shaped seating device having a required thickness is usually used by being placed on a chair, but it can be used as it is or together with a seating chair.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing an example of a sitting apparatus according to the present invention, which is formed in a mat shape having a required thickness. 2 is a plan view of the sitting apparatus shown in FIG. 1, FIG. 3 is a front view, FIG. 4 is a rear view, FIG.
6 is a sectional view taken along the line AA of FIG. 2, and FIG. 7 is a sectional view taken along the line BB of FIG.

Reference numeral 1 denotes a sitting device formed in a mat shape. The sitting device 1 has a substantially square shape in plan view and has a required height (in the present embodiment, the highest rear end is 7.5 c
m, the lowest front end 4.5 cm. ) And FIG.
As shown in (1), it is formed with a gentle slope as a whole from the rear (left side in the figure) to the front (right side in the figure).

The sitting apparatus 1 has a main part 2 made of a rigid elastic foam, for example, urethane foam. Examples of the material of the main part 2 include various materials such as synthetic rubber, a foam of vinyl chloride resin, and an ethylene-vinyl acetate copolymer, in addition to the urethane foam. A thin cushioning sheet 3 having cushioning properties is adhered to the upper surface of the main part 2. This makes it harder or harder for a person to sit when sitting. As a material of the buffer sheet 3, in addition to urethane foam, synthetic rubber, foam of vinyl chloride resin,
Various materials such as an ethylene-vinyl acetate copolymer can be exemplified. The upper surface and the side surface of the main part 2 of the buffer sheet 3 are covered with a sheet-like surface material 4 having flexibility, such as velvet cloth.

A reinforcing plate 5 made of, for example, a plywood or another material is adhered to the lower surface of the main part 2.
The end of the surface material 4 covering the upper surface of the buffer sheet 3 and the side surface of the main part 2 extends to the edge of the reinforcing plate 5, and includes the end of the surface material 4. The base 6 is attached to the lower surface.

The seating surface 20 located on the upper surface of the sitting device 1
A concave portion 2 in which a portion that comes into contact with the buttocks and thighs when sitting is formed substantially in accordance with the curved surface of the human body.
1 is formed. The concave portion 21 is formed by pressing a heated mold formed substantially in conformity with a curved surface of a human body against the main portion 1 and plastically deforming the main portion 2 by heating the mold. At the same time as the formation of the concave portion 21, the side surface of the main portion 2 is also heated and reinforced.

At the rear end of the seating surface 20, a part of the concave portion 21 is cut out in a “U” shape at a place where the sacrococcyx abuts when sitting, and a hole 22 is formed. I have. The hole 22 penetrates from the seat surface 20 side to the bottom surface. The dimension of the hole is about 10 cm in both front and rear and left and right directions. With this dimension, the ischia is located on the seating surface 20 and the sacrococcyx is located in the hole 22. A raised portion 23 located between the thighs is formed at the center of the concave portion 21.

The recess 21 is formed with a forward inclination angle of essentially 4 ° with respect to a horizontal plane. The hardness of the seat surface 20 is set to a hardness that does not substantially change the forward inclination angle.
In addition, the forward tilt angle referred to here is the point P1 shown in FIG. 1 (where the ischium tuber hits in the recess 21) and the point P2.
It shows the angle at which the line connecting the (front edge of the recess 21) and the horizontal line intersect.

Operation FIG. 8 is an explanatory view of a use state in which the sitting device is mounted on a seat portion of a chair, and shows a state of a vertebra. In the sitting device 1, the recessed portion 21 of the seating surface 20, the portion of which comes into contact with the buttocks and thighs when sitting, is formed substantially in accordance with the curved surface of the human body, There is provided a hole 22 which is sometimes a place where the sacrococcal abuts and is formed including a part of the concave portion 21. Therefore, when a person sits in the recess 21, the contact area between the body and the seat surface increases,
As a result, the load applied to the human body is dispersed, and the compression force applied to the thighs and buttocks is reduced. No load is applied to the coccygeal bone. Therefore, pain and fatigue are reduced even when sitting for a long time.

Further, in addition to the above configuration, since the recessed portion 21 is formed with a anteversion angle of essentially 4 ° with respect to the horizontal plane, the physiological lordosis of the vertebra can be maintained in an appropriate state even in a relaxed state. Can be. Therefore, the burden on the posture holding muscles of the neck, shoulder, and back is alleviated, and fatigue of these muscles can be reduced.

It should be noted that the terms and expressions used in the present specification are merely illustrative and not restrictive, and the terms described in the present specification and terms equivalent to a part thereof are used. There is no intention to exclude words or expressions. Further, the present invention is not limited to the illustrated embodiment, and it goes without saying that many modifications can be made within the scope of the technical idea of the present invention.

[0030]

The present invention has the above-described structure and has the following effects. (A) The sitting device according to the present invention includes a concave portion in which a portion of the seat surface that comes into contact with the buttocks and thighs when seated is formed substantially in conformity with a curved surface of a human body; And a hole formed by including a part of the recessed portion, where the sacrococcyx abuts when sitting. Therefore, the contact area between the human body and the seating surface increases, whereby the load applied to the human body is dispersed, and the compressive force applied to the thighs and buttocks is reduced. Also, no load is applied to the sacrococcyx.
Therefore, pain and fatigue are reduced even when sitting for a long time.

(B) In addition to the above-mentioned structure, the above-mentioned concave portion is formed with a forward inclination of essentially 2 to 6 ° with respect to the horizontal plane because of the drag and inclination applied to the pelvis and the ischial tuberosity. It has been found that the pelvic upright angle can be maintained physiologically by the sliding frictional drag, whereby the physiological lordosis of the vertebra can be maintained in an appropriate state even in a relaxed state. Therefore, the burden on the posture holding muscles of the neck, shoulder, and back is alleviated, and fatigue of these muscles can be reduced.

(C) A mat-shaped seating device having a required thickness is usually used by being placed on a chair.
It can be used as is or with a chair.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a sitting apparatus according to the present invention, which is formed in a mat shape having a required thickness.

FIG. 2 is a plan view of the sitting device shown in FIG. 1;

FIG. 3 is a front view of the sitting device shown in FIG. 1;

FIG. 4 is a rear view of the sitting device shown in FIG. 1;

FIG. 5 is a bottom view of the sitting device shown in FIG. 1;

FIG. 6 is a sectional view taken along line AA of FIG. 2;

FIG. 7 is a sectional view taken along line BB of FIG. 2;

FIG. 8 is an explanatory view of a use state in which the sitting device according to the present invention is mounted on a seat portion of a chair.

FIG. 9 is an explanatory diagram showing a state of a vertebra when a person sits on a conventional chair.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sitting device 21 Depression 22 Hole

Claims (3)

(57) [Claims] 1. A sitting device which reduces the pressure on the buttocks and thighs when sitting and eliminates the force applied to the coccyx, and wherein the sitting device has a buttocks when sitting on a seating surface. And a concave portion (21) in which a portion in contact with the thigh is formed substantially in accordance with the curved surface of the human body; and A hole (22) including a part thereof, and a sitting device. 2. A sitting device that reduces a feeling of pressure on the buttocks and thighs when sitting and removes a force applied to the sacrococcyx, thereby facilitating a forward leaning posture. The concave part (21) of the surface, which is in contact with the buttocks and thighs when sitting, is formed substantially in accordance with the curved surface of the human body, and the sacral bone abuts when sitting on the sitting surface And a hole (22) formed to include a portion of the recess, wherein the recess is essentially 2-6 ° relative to a horizontal plane.
A seating device, characterized in that the seating device is formed with a forward inclination angle of. 3. The sitting device according to claim 1, wherein the sitting device is a chair or a mat having a required thickness.