PROBLEM TO BE SOLVED: To provide a dental treatment chair which enables the treatment of patients in stable attitudes by keeping a head support part of a pillow from reaching the head part of a patient however a pillow support plate may vary while however the pillow may vary relative to the pillow support plate when a patient sits on the dental treatment chair in a forward drooped attitude as being bent on the back among high-aged persons, disabled persons and the like.SOLUTION: The pillow device for dental treatment chairs is constituted of a liftable seat part, a back rest B1 erectable relative to the seat part, the pillow support plate 6 which moves vertically on the back side of the backrest and is made to stick out of the top part of the back rest and hence, bent toward the head part side of a patient sitting or lying on the back, a pillow angle cylinder 5 which is housed into the back side of the back rest to move the pillow support plate vertically, a pillow lift cylinder 4 for the vertical movement of the pillow angle cylinder and a double-axially structured pillow rotation device 8 which is mounted between the pillow support plate and the pillow and enables the fixing of it at a desired rotary position with respect to the pillow support plate and the pillow.COPYRIGHT: (C)2008,JPO&INPIT【課題】高齢者や身障者等において背中が曲がっていて前かがみの姿勢の患者を歯科治療椅子に着座させた場合に、枕支え板を如何様に変化させ、かつ、枕を枕支え板に対して如何様に変化させても枕の頭支持部が患者の頭部に届かず安定した姿勢での治療ができる歯科治療椅子を提供する。【解決手段】昇降可能な座部と、該座部に対して起伏可能な背凭れB1と、該背凭れ背面側を上下動し背凭れの上部から突出され、着座あるいは仰臥している患者の頭部側に向かって湾曲された枕支え板6と、前記背凭れの背面内に収納され前記枕支え板を上下動させるための枕角度シリンダ5と、該枕角度シリンダを上下動させるための枕昇降シリンダ4と、前記枕支え板と枕との間に取付けられ枕支え板および枕に対して所望回転位置で固定可能とする2軸構造の枕回動装置8とから構成した歯科治療椅子の枕装置である。【選択図】 図1
