To provide a backrest of chair by which low back pain and fatigue are reduced by straight supporting a spine 2.SOLUTION: For the purpose of straight supporting a spine 2 by avoiding influence of both blade bones 3, 3 and both iliac bones 4, 4, the rear of the erector muscles 6, 6 of spine in a range reaching from between both blade bones 3, 3 to between both iliac bones 4, 4 is supported by a flat rigid body. Also, in the backrest 1 of a chair in which the breadth of the supporting flat is laterally spread in the range untouchable from the lower part circumferential of the ribs to both iliac crests 4a, 4a, the size indicating the shape adapted to a person having the body length of approximately 170 cm shown in Fig. 2 is made a reference. In a body length in excess of the adaptable range, the size reference is similarly changed in accordance with the body length difference, with the backrest 1 of a chair adapted to the size of the back.SELECTED DRAWING: Figure 3

    【課題】脊柱2を真っすぐに支持することによって腰痛や疲労を軽減した椅子の背もたれを提供する。【解決手段】両肩甲骨3・3と両腸骨4・4の影響を避けて脊柱2を真っすぐに支持するために、両肩甲骨3・3間から両腸骨4・4間に至る範囲の脊柱起立筋6・6の背後を平面の剛体で支持し、且つ肋骨の下部周辺から両腸骨稜4a・4aに触れない範囲で前記支持平面の横幅を左右に広げてなる椅子の背もたれ1において、図2に示す身長170cm前後の人に適応させた形状を示す寸法を基準とし、その適応範囲をこえる身長においてはその身長差に応じて前記寸法基準を相似的に変更し背中の大きさに適応させた椅子の背もたれ1。【選択図】図3


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    Title :

    BACKREST OF CHAIR


    Additional title:

    椅子の背もたれ


    Contributors:

    Publication date :

    2023-12-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / A47C Stühle , CHAIRS



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