PROBLEM TO BE SOLVED: To provide a chair in which low back pain is not caused even by a long-term sitting position and desktop work is not disturbed.SOLUTION: A chair is characterized in that a seat surface of the chair is divided into the right and left at the front portion, the right and left seat surface parts can be inclined in the longitudinal direction by using a rake-bar of a rear end as a hinged support, and further the right and left seat surface parts are interlocked by an interlocking device connecting the right and left seat surface parts. A relaxation posture at the time when crossing legs can be taken even if the legs are not intersected. Also, active exercise of a lower limb-pelvis-waist of the same quality as walking can be performed, and thereby an adverse effect with the same persistence posture is eliminated. Also, a pressure state in a femoral thigh can greatly be changed. These measures prevent low back pain, and further may not become the posture of disturbing desk work.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2017,JPO&INPIT【課題】長時間の座位にても腰痛を引き起こさず,机上作業を妨げない椅子を提供すること.【解決手段】椅子の座面が前側部分において左右に分かれており,左右の座面部は後端部の横支軸を回転支点に前後傾斜でき,さらに左右の座面部をつなぐ連動装置により,左右の座面部が連動して互い違いに前後傾斜する椅子である.脚を交差させなくても足を組んだ時のリラックス姿勢をとることができ,また歩行と同質の下肢-骨盤-腰の能動的運動を行うことが可能で持続同一姿勢に伴う弊害を解消する.また殿大腿部における圧迫状態を大きく変化させることができる.これらにより腰痛を防止し,さらにデスクワークを妨げる姿勢とならない.【選択図】図6
