JP2004216145A - Chair for uprightly sitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair for uprightly sitting and helping a user stably maintain a natural, uprightly sitting posture even when the user different from a physical form uses it as it is. <P>SOLUTION: A seat face 13 of the chair for uprightly sitting comprises a seat part 12 consisting of a thigh support part 13a and a hip support part 13b and a seat part support part 14 for supporting the seat part 12. A curved portion 18a gently curved outward only in the longitudinal direction is formed on the bottom face 18 of the seat part support part 14 under the thigh support part 13a. When the user puts his lower thighs B into the space under the seat part 12 regardless of his physical figure, the curved part 18a is brought into contact with a floor face F. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sitting chair used for long hours of sitting.

In recent years, an increasing number of people are suffering from low back pain due to weakness of antigravity muscles such as abdominal muscles and back muscles. It is generally known that sitting straight is effective for stretching the back muscles and preventing low back pain, but when sitting straight, the weight from the thigh to the head is directly applied to the lower legs and feet, which compresses the lower legs and feet, causing blood loss. Circulation was obstructed, resulting in numbness. For this reason, in the statutes and the like, buttocks that lift only the buttocks for the purpose of temporary use have been partially used, but they are unstable or cannot take a natural sitting posture for the reasons described below.

  In recent years, the user has bent a flat plate that allows the user to set a seat suitable for himself, and the seat is formed on the upper part of the chair, and the base is formed as a single plate. A straight seat chair has been devised in which a connecting bolt is provided, a turnbuckle is screwed into the connecting bolt, and the turnbuckle is rotated to change the inclination angle and height of the seat.

In some cases, the seat is constituted by a seat and a seat base on which the seat is mounted so that the height can be adjusted, and the lower leg is brought into contact with the seat base when sitting straight.
JP 2001-112579 A (FIG. 1 on page 1) Japanese Patent Application Laid-Open No. 2000-316671 (FIG. 1 on page 1) JP-A-10-113254 (FIG. 1 on page 1) Kunishin Sangyo "Balance Chair Catalog" Kunishin Sangyo Co., Ltd.

However
However, the seat seat disclosed in Japanese Patent Application Laid-Open No. H11-157686 is not suitable for use by an unspecified person because the user must set the seat to an optimal state according to his / her body shape. In addition, in the sitting posture, both feet are located below the buttocks, but in this sitting chair, since the base is grounded under the buttocks, both feet must be seated away from each other in the natural posture, which is not a natural posture.

In the straight seat chair disclosed in the above, the lower leg is placed between the seat and the base so as to be seated, so that the stability is good, the foot fits right below the buttocks, and a natural posture is obtained. Is slightly larger than the lower leg and cannot be used easily. Also, once the lower leg is put on the base, the position cannot be corrected.

In order to solve the above-described problems, a seat chair according to the present invention has a seat having a seat surface including a thigh support portion and a buttock support portion, and a seat portion including a seat portion support portion supporting the seat portion. In the chair, below the thigh support portion, a curved portion which is gently curved outward only in the front-rear direction is formed on the bottom surface of the seat portion support portion, and a user can place the curved portion below the seat portion regardless of its body shape. It is characterized in that the curved portion comes into contact with the floor surface when the lower leg is put in and seated.

The sitting chair according to the first aspect of the present invention can take a stable sitting posture without setting the seat portion each time by changing the grounding point of the curved portion even if an unspecified person having a different body shape is used. . In addition, if the sitting chair is used during the growth period, a stable sitting posture can be obtained without resetting according to the growth of the body, and a correct posture that is less likely to cause back pain can be naturally acquired. The structure is simple and inexpensive to manufacture, and it is durable and compact, so it can be used anywhere, and its position at the place of use can be easily corrected as in a chair. Because it can abut on the floor below the thigh support when sitting straight, there is space under the buttocks and both feet fit under the buttocks in a natural form.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the sitting chair 10 according to the first embodiment has a seat 12 having a seating surface 13 including a thigh support 13 a and a buttocks support 13 b, and a seat support supporting the seat 12. It consists of 14. The seat support portion 14 is formed by crossing a front and rear support plate 15 having a curved bottom front surface and a flat bottom rear surface and a substantially square left and right support plate 16 having a height of 130 mm and a horizontal direction of 180 mm. A bottom plate 17 gently outwardly curved only in the front-rear direction is fixed to the bottom surface of the front plate and the front of the curved bottom surface of the front and rear support plate 15. The bottom surface 18 a of the bottom plate 17 and the bottom flat portion 18 b of the front and rear support plate 14 are fixed. Thereby, the bottom surface 18 of the support portion is formed without a step. The bottom plate 17 is made of a molded plywood formed with a radius of curvature of 300 mm on the outside, and is trimmed into a substantially trapezoidal shape so as to fit in the gap between the left and right lower legs as shown in FIG. Is made. The seat portion 12 is a substantially rectangular plate-like member of 240 mm in the front-rear direction and 320 mm in the left-right direction made of plywood, and is fixed to the upper surface of the front-rear support plate 15 of the seat portion support portion 14 and the upper surface of the left-right support plate 16. The seating surface 13 when the flat bottom portion 18b formed on the floor abuts on the floor surface F is inclined forward at an angle of 9 degrees with respect to the floor surface F. A cushion may be placed on the seat 12 or used, or the cushion may be fixed.

In the sitting chair 20 according to the second embodiment, the seat portion 22 is bent downward at the rear end as shown in FIG. 4 to form a bent portion 23c, and the bottom plate 27 is flattened rearward from the curved portion 28a as shown in FIG. To form a flat portion 28b, which is trimmed into a substantially triangular shape so as to fit in the gap between the right and left feet as shown in FIG.

Operation of the embodiment

Next, the operation of the above-described sitting chair according to the present invention will be described in detail with reference to FIGS. 6 to 9 in comparison with a hip rest 30 for lifting only the buttocks D. As shown in FIG. 9, the gap between the lower leg B when sitting straight is large from the ankle to the knee. As shown in FIGS. 6 and 7, the buttocks 30 for lifting only the buttocks D have the bottom surface 38 located in the gap from the left and right ankles to the toe direction. The lower leg B and the foot C protrude outside the buttocks D and cannot take a natural sitting posture. On the other hand, if the left and right lengths are reduced, the left and right sides become unstable. Further, in order to cope with the difference in the forward inclination angle of the thigh A due to the difference in the user's body shape, only the buttocks D can be supported, and a sufficient length cannot be obtained before and after the seat surface 33. Therefore, the area of the seat surface 33 is insufficient and a comfortable sitting comfort cannot be obtained.

In the seat chair according to the present invention, the user forms a curved portion 18a that is gently curved outward only in the front-rear direction on the bottom surface 18 of the seat portion support portion 14 below the thigh support portion 13a. When bending the thigh A and the lower leg B on the floor surface F such as a tatami mat surface and sitting on the lower leg, the seat 12 is sandwiched between the thigh A and the lower leg B and the seat 12 is seated along the back side of the thigh A when seated. Since the seat support portion 12 leans forward and abuts on the floor surface F at the curved portion 18a, a curved portion 18a having a sufficient length in the left-right direction can be formed in the gap from the ankle to the knee direction, and the left and right stability is improved. While being secured, the left and right feet C fit under the buttocks support portion 13b, and a natural sitting posture can be taken. If the center of gravity shifts rearward, the flat portion 18b behind the support portion bottom surface 18 abuts on the floor F and stabilizes.
In addition, the pelvis naturally leans forward as the seat 12 tilts forward, and the spine can maintain an ideal posture for forming an S-shaped curve (not shown) for a long time.

The optimization of the forward inclination angle of the seat 12 will be described in detail with reference to FIGS.
Since the seat 12 tilts along the back of the thigh A when the user is seated, as shown in FIG. 8, when the person with long legs uses the seat 12, the seat 12 is compared along the back of the thigh A. By leaning forward at a small angle, a stable sitting posture can be obtained. Conversely, as shown in FIG. 10, when a person with short legs uses the seat portion 12, the seat portion 12 tilts forward at a relatively large angle along the back side of the thigh As, so that a stable sitting posture can be obtained.
Thus, even when an unspecified person having a different body shape uses the sitting chair, the curved portion of the seat portion support portion 14 can be obtained at the time when each person sits without adjusting the angle of the seat portion 12 according to his / her body shape. 18a rolls and abuts the floor F at different grounding points, resulting in the abutment of the floor F at the most stable position for the user.

  In the sitting chair 20 according to the second embodiment, since the seat portion 22 has the rear end bent downward as shown in FIG. 4, the ischial bone is locked to the bent portion 23 c during the straight sitting, and the seat portion 22 is tilted forward. This has the effect of preventing the buttocks from slipping. The bottom plate 27 extends flat from the front curved portion 28a to the rear as shown in FIG. 4 to form a flat portion 28b. When the right and left feet C fall under the buttocks support portion 13b and the center of gravity moves rearward and comes into contact with the floor F, the load is distributed to the floor F because the ground contact area is large.

Industrial applications

FIG. 2 is a perspective view of the seat chair according to the first embodiment of the present invention. Side view of the sitting chair shown in FIG. FIG. 1 is a bottom perspective view of a seat support portion of the sitting chair shown in FIG. 1. Side view of the sitting chair according to the second embodiment FIG. 1 is a bottom perspective view of a seat support portion of the sitting chair shown in FIG. 1. Explanatory drawing showing a state where a person is sitting on an existing butt pad Explanatory drawing showing the appearance of lower legs and feet when a person sits on an existing hip pad Explanatory drawing showing a state where a long-legged person is seated on a sitting chair according to the present invention. Explanatory drawing showing the appearance of lower legs and feet when a long-legged person is seated on a sitting chair according to the present invention. Explanatory drawing showing a person with short legs sitting on a sitting chair according to the present invention

Explanation of reference numerals

12: seat 13a: thigh support 13b: buttocks support 14: seat support 17: bottom plate 18a: curved portion 18b: flat portion

Claims (1)

  A sitting chair whose seating surface (13) includes a seat (12) including a thigh support (13a) and a hip support (13b), and a seat support (14) supporting the seat (12). , A curved portion (18a) gently curved outward only in the front-rear direction is formed on the bottom surface (18) of the seat support portion (14) below the thigh support portion (13a). A straight seat chair configured such that the curved portion (18a) abuts on the floor (F) when the lower leg (B) is placed under the seat portion (12) and seated, regardless of the body shape.

Images