Patent ID: 8177733

Claim:
A body weight support device comprising: a body attachment part attached to a body of a user; a floor contact part provided contactably on a floor, a leg part including an upper thigh link part, a knee joint part, and a lower thigh link part for connecting said body attachment part to said floor contact part through a joint part including the knee joint part, the upper thigh link part, the knee joint part, and the lower thigh link part being adjusted in length to prevent the upper thigh link part and the lower thigh link part from becoming in line and bending to a reverse side when the user wears the body weight support device; an actuator for driving said joint part; and a control unit for controlling driving of said actuator, said control unit driving said actuator to produce rotational power at the knee joint part, so that said leg link part gives a body weight support force to said user through said body attachment part, the body weight support force being a force for partially supporting weight of the user, and the leg link part is provided not to exert the body weight support force directly on upper or lower thighs or knee joints of the user while the user is wearing said body weight support device, and the leg link part is kept bent while the user is wearing said body weight support device, wherein, when the user swings forward a leg of the user, the foot attachment is delayed relative to the knee joint part.