OPERATION ASSIST DEVICE

To make it possible to generate large auxiliary force to assist return of a user to an upright state.SOLUTION: A restiform body, of which one end is connected to a first pulley and a second end is connected to a second pulley, is wound on outer peripheral surfaces of the first pulley and the second pulley, and a first rotary shaft, which is a rotation axis of the first pulley, is provided with an elastic body which applies force according to a rotation angle of the first pulley to the first pulley. The first pulley is rotated by energization force of the elastic body to wind the restiform body on the first pulley, and the second pulley rotates by releasing the restiform body from the second pulley. By rotation of the second pulley, a small gear, which rotates around a second rotary shaft together with the second pulley, and a large gear, which can engage with the small gear, are rotated, and the large gear rotates an inferior limb rod via a transmission mechanism. Further, an outer diameter of the second pulley is larger than an outer diameter of the first pulley, and the number of teeth of the large gear is more than the number of teeth of the small gear.SELECTED DRAWING: Figure 1 【課題】大きな補助力を発生させて、使用者が直立状態へ戻るのを補助することができる。【解決手段】第１プーリに第１端が連結され、第２プーリに第２端が連結された索状体は、第１プーリ及び第２プーリの外周面に巻回されており、第１プーリの回転軸である第１回転軸には、第１プーリの回転角度に応じた力を第１プーリに付勢する弾性体が設けられている。弾性体の付勢力により第１プーリが回転して索状体を第１プーリに巻回し、かつ索状体を前記第２プーリからほどくことで第２プーリが回転する。第２プーリの回転により、第２プーリと共に第２回転軸を中心に回転する小ギア及び小ギアと嵌合可能な大ギアが回転し、伝達機構を介して大ギアが下肢ロッドを回転させる。また、第２プーリの外径は第１プーリの外径より大きく、大ギアの歯数は小ギアの歯数より多い。【選択図】図１