Patent ID: 8642904

Claim:
A link structure, comprising: an outside link member including a first opening portion having inner lateral sides, wherein shaft holes are formed in respective ones of the inner lateral sides and face each other across the first opening portion, and first stopper members arranged on the respective ones of the inner lateral sides and facing each other across the first opening portion, each first stopper member having a side with a first inclined surface inclining toward the first opening portion and thinning down the first stopper member toward the first opening portion, and a first stopper surface on another side of the first stopper member, wherein the outside link member is elastically deformable based on a pressure applied to the first inclined surfaces that increases a distance between the shaft holes and between the first stopper members; and an inside link member including a second opening portion having outer lateral sides, link rotational shafts disposed in the shaft holes, the link rotational shafts arranged on respective ones of the outer lateral sides of the inside link member and opposite each other across the second opening portion, and second stopper members, each second stopper member having a side with a second inclined surface inclining toward the outside of the inside link member and thinning down the second stopper member toward the outside of the inside link member, and a second stopper surface on another side of the second stopper member, the second stopper members arranged on the respective ones of the outer lateral sides and opposite each other across the second opening portion, wherein the inside link member is elastically deformable based on a pressure applied to the second inclined surfaces that decreases a distance between the second inclined surfaces and between the link rotational shafts; wherein the inside and outside link members are able to rotate against each other, and the first and second stopper surfaces face each other.