Patent ID: 10155454

Abstract:
A seat surface part is switchable by a switching mechanism between a forward-unfolded posture in which the seat surface part is forwardly unfolded down so that a first support surface comes into a state at a low position where the seated person lowers his or her body to sit, and a second support surface comes into a state of forming a backwardly inclined surface that is inclined backwardly downward, and a folded-up posture in which the seat surface part is folded up backward from the forward-unfolded posture so that the second support surface is lifted up at a higher position than a position of the first support surface in the forward-unfolded posture, and an upper surface inclined forwardly downward is formed by the backwardly inclined surface so that the second support surface comes into a state at a high position where the seated person perches in a standing posture.