Patent ID: 8083695

Claim:
A walk assistance device having a load transmit portion, a foot attachment portion attachable to a user's foot, and a leg link between the load transmit portion and the foot attachment portion, in which a force generated by the leg link is transmitted to a user's trunk via the load transmit portion, wherein the leg link includes an upper first link portion connected to the load transmit portion via a first joint portion, a lower second link portion connected to the foot attachment portion via a second joint portion, a middle third joint portion connecting the first link portion to the second link portion such that a distance between the first joint portion and the second joint portion is variable; wherein a driving source is directly attached to the first link portion and mechanically connected to the third joint portion so as to drive the third joint portion; wherein the center-of-gravity of the entire leg link is above the third joint portion; wherein the driving source includes an electric motor and a reduction gear, and wherein the reduction gear and the electric motor are disposed on the first link portion and the reduction gear is located between the electric motor and the third joint portion such that the reduction gear is closer to the third joint portion than the electric motor, and the electric motor is spaced from the third joint portion along the first link portion.