PROBLEM TO BE SOLVED: To provide an arm supporting tool that stably maintains a locked state, and enhances reliability in the case of placing arms of an operator in a held state.SOLUTION: Rotational supporting parts 30 and arm supporting parts 20 include a rotational angle holding mechanism capable of holding at predetermined rotation angle with a first rotational axis 31 as a center. The rotational angle holding mechanism is in a held state in the state where the arm supporting parts 20 is brought into contact with the rotational supporting parts 30, and is constituted to cancel the held state by moving the arm supporting parts 20 so as to separate from the rotational supporting parts 30 with a second rotational axis 32 as a center. The mechanism is constituted of: a plurality of concentrically provided locking grooves 34 which are provided for any one of the rotational supporting parts 30 and the arm supporting parts 20 and a locking claw which is provided for any other one of the rotational supporting parts 30 and the arm supporting parts 20 and locked and held with any one of the plurality of locking grooves 34, and comprises a resistance mechanism which creates resistance in a region where the locking grooves 34 and the locking claw are joined, and maintains the held state between the rotational supporting parts 30 and the arm supporting parts 20.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】係止状態を安定的に維持して作業者の腕を保持状態に置く際の信頼性を高める腕支持器具を提供する。【解決手段】回転支持部30と腕支持部20は、第一回転軸31を中心として、既定の回転角度にて保持可能な回転角保持機構を備える。回転角保持機構は、腕支持部20を回転支持部30に当接させた状態で保持状態とし、腕支持部20を第二回転軸32を中心に回転支持部30から離間させるように移動させることで保持状態を解除するよう構成され、回転支持部30及び腕支持部20のいずれか一方に設けられた、同心円状に設けられた複数の係止溝34と、回転支持部30及び腕支持部20のいずれか他方に設けられた、複数の係止溝34の何れかに係止されて保持される係止爪とで構成されており、係止溝34と係止爪とが接合される領域に抵抗を生じさせて、回転支持部30と腕支持部20との保持状態を維持する抵抗機構を備える。【選択図】図1
