PROBLEM TO BE SOLVED: To provide a stand-up support chair storing a self-biasing force that is useful for those who want to stand ones own despite of their weak leg muscles, and that have extremely pursued a simple and robust mechanism requiring no maintenance.SOLUTION: In the chair, a seat is held vertically liftably, being guided by support legs or a backrest, and the seat uses a compression coil spring as an elastic member to support the seat. A large coil spring is employed so as to exert a sufficient spring reaction force within a lifting range, and the large coil spring is mounted in a compressed state such that the reaction force is 30% or more to 65% or less of the total load in a standby state. In order to prevent from deforming a coil form and keep the attitude of the coil itself, the outer diameter of the coil is 150 mm or more to 300 mm or less, and the inner or outer diameters are restrained over a height of at least 55 mm in holding parts of the upper and lower ends. The seat is also tilted forward by an up-down mechanism in the standby state.COPYRIGHT: (C)2012,JPO&INPIT【課題】足腰が弱いが自力での立ち上がりを望む人々のために役立ち、しかも一切のメンテナンスを要しない単純堅牢な機構を極限まで追求した、付勢力自力蓄積型の立ち上がり補助椅子を提供する。【解決手段】支脚または背もたれ部を案内として腰座を垂直に昇降自在に保持し、腰座を支える弾発部材として圧縮コイルばねを使用する。昇降範囲において充分なばね反力を発揮できるように長大コイルばねを使用し、待ち受け状態において全荷重の30%以上、65%以下の反力となるように圧縮して組み込む。コイル形状の崩れを防ぎコイル自体の姿勢を維持するために、コイル外形を150mm以上、300mm以下とするとともに、上下両端の固定部において少なくとも55mmの高さについて内径または外径を拘束する。また、待ち受け状態では、座面を起伏機構によって前傾させる。【選択図】図5
