Patent ID: 7850565

Claim:
A toothed plate-link chain, said chain comprising: a plurality of plates that form sets of plates, which are connected by a hinged connection with neighboring sets of plates by at least one rocker member, wherein the rocker member of a hinged connection is connected with the plates of a set of plates through a connection opening in the plates and wherein two rocker members of neighboring sets of plates form the hinged connection, wherein adjacent rocker members can roll against each other at a roller profile, wherein the set of plates includes at least one guide plate including a connection opening for receiving only a single rocker member, wherein the rocker member includes a guide profile having outer ends connected to respective ends of a roller profile through a first connecting profile at a first end of the roller profile and having a constant radius of curvature region, and a second connecting profile spaced from the first connecting prone and at a second end of the roller profile, the second connecting profile having a constant radius of curvature region, wherein the connection opening of the guide plate has a guide profile surface that matches and is in surface-to-surface contact with the guide profile of the single rocker member and has a roller profile surface that matches and is in surface-to-surface contact with the roller profile of the single rocker member, the guide plate connection opening including an undercut region opposite each of the connecting profiles of the rocker member to define respective gaps between the first and second rocker member connecting profiles and the opposed undercut regions of the guide plate opening, and wherein the gaps between the first and second connecting profiles of the rocker member and the opposed guide plate opening undercut regions include a constant gap width region at the constant radius of curvature regions of the rocker members, and parabolic transition regions at each outer end of each of the undercut regions of the guide plate openings, wherein the parabolic transition regions terminate at respective contact points between the guide plate opening and the rocker member guide profile and between the guide plate opening and the rocker member roller profile, whereby stresses within the guide plate at the undercut regions are reduced during operation of the chain in a load transmitting mode.