Patent ID: 8182383

Claim:
A plate-link chain comprising: a plurality of link plates that form plate sets, wherein adjacent plate sets are hingedly connected to each other by pairs of rocker members, wherein the rocker members of a rocker member pair have rolling surfaces that bear against each other and oppositely-facing receiving regions, wherein a plurality of plate sets include a cover plate on respective outer sides of a plate set, wherein rocker members associated with a plate set having the cover plates are press-fitted into openings in the cover plates, wherein at least one of the cover plate openings includes a first contact surface that is in surface-to-surface contact with a rocker member rolling surface, and a pair of second contact surfaces that are each opposite to and face the first contact surface and are in surface-to-surface contact with a respective one of the rocker member receiving regions, a first stress relief cut at a first end of the first contact surface and a second stress relief cut at a second end of the first contact surface, wherein the at least one cover plate opening includes a third stress relief cut spaced from each of the first and second stress relief cuts, wherein rocker members are in contact with each of the three contact surfaces in the at least one cover plate opening and the third stress relief cut is provided between the pair of second contact surfaces, and wherein the rocker members have a profile that is concave in a rocker member region that is opposite to the third stress relief cut.