PROBLEM TO BE SOLVED: To lower a manufacturing cost of an elevating/lowering legless chair for elevating and lowering an elevating/lowering unit to which a seat is attached along an elevating/lowering guide rail of a base unit.SOLUTION: An elevating/lowering legless chair includes a pair of left and right armrests 14 each attached to a support frame 18 by an armrest spring-up mechanism 42 in common for the left and right. The armrest spring-up mechanism 42 includes: an arm rotary shaft member 43 attached to one of the support frame 18 and the armrest 14 an arm rotary shaft receiving member 44 attached to the other, for rotatably supporting the arm rotary shaft member 43 and a positioning member 45 for limiting the movable angle range of the arm rotary shaft member 43 with respect to the arm rotary shaft receiving member 44. In a member to which the positioning member 45 is to be attached, both of a right attaching part 50 for arranging the positioning member 45 at such a position that the movable angle range of the armrest 14 becomes a movable angle range for the right side and a left attaching part 51 for arranging the positioning member 45 at such a position that it becomes the movable angle range for the left side are provided, and the armrest spring-up mechanism 42 are adaptable to any of the left and right armrests 14 by selecting the attaching parts 50 and 51.COPYRIGHT: (C)2014,JPO&INPIT【課題】製造コストを安く抑える。【解決手段】昇降座椅子は、左右共通の肘掛け跳ね上げ機構42によって支持フレーム18にそれぞれ取り付けられた左右一対の肘掛け14を備えている。肘掛け跳ね上げ機構42は、支持フレーム18と肘掛け14とのいずれか一方に取り付けられた肘回転軸部材43と、いずれか他方に取り付けられ、肘回転軸部材43を回転可能に支持する肘回転軸受け部材44と、肘回転軸受け部材44に対する肘回転軸部材43の可動角度範囲を制限する位置決め部材45とを備えている。位置決め部材45が取り付けられる部材には、肘掛け14の可動角度範囲が右側用の可動角度範囲になる位置に位置決め部材45を配置する右用取付部50と左側用の可動角度範囲になる位置に位置決め部材45を配置する左用取付部51との両方が設けられており、取付部50,51の選択により左右いずれの肘掛け14にも対応する。【選択図】図1
