Sitting tool and chair

Abstract

Provided are a sitting tool and a chair that naturally improve the sitting posture of a seated person, making comfortable sitting possible. This sitting tool (1) is provided with a seat board (3). The seat board (3) is provided with a first sitting surface (21) and a second sitting surface (22) that is continuous with the first sitting surface (21) and extends towards the front of the sitting tool. The second sitting surface (22) is formed to have a different level, which is higher than the first sitting surface (21), by the first sitting surface side end face (221). When the buttocks of the seated person is supported by the first sitting surface (21) and the upper part of the thighs of the seated person is supported by the second sitting surface (22), the level difference restricts the ischium of the seated person to move forward. The first sitting surface (21) extends across the entire width of the seat board (3) in the left-right direction of the sitting tool without being obstructed by any level differences.

Description

technical field [0001] The present invention relates to seating and chairs. Background technique [0002] Due to the widespread use of personal computers, most workers, including those engaged in clerical jobs, are forced to work long hours at their desks. In this case, in recent years, many people suffer from diseases such as back pain and chronic fatigue in the back. In many cases, back pain and chronic fatigue in the back etc. are caused by the sitting posture during work. Figure 17 (a) and 17(b) are schematic diagrams showing a part of the worker's skeleton when the worker sits on the chair. exist Figure 17 In (a) and 17(b), the legs of the chair 7 are omitted for simplification of description. [0003] Figure 17 (a) shows the ideal posture of the worker. In this posture, the pelvis 91 is supported by the seat board 71 and the back board 73 so as to assume an upright state. As a result, the spine 92 forms an S-shaped curve similar to the shape of the spine when th...

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult to maintain this ideal posture for a long time, and during a long period of work, the worker's pelvis 91 will spontaneously slide forward and enter such a position. Figure 17 Sitting position shown in (b)

In the above conditions, the spine 92 is pressed against the back plate 73, and the spine 92 cannot maintain the S-shaped curve

When the above-mentioned posture is maintained for a long time, excessive pressure is applied to the pelvis 91 or the spine 92, resulting in back pain and chronic fatigue of the back, etc.

Although staff often consciously maintain Figure 17 When sitting in the posture shown in (a), it may be avoided Figure 17 The posture shown in (b), but in reality, workers are so absorbed in their work that they are unaware that they are in the Figure 17 The pose shown in (b)

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