Patent ID: 7179184
Filing Date: 2007-02-20
Classification: F16G

Abstract:
1. A link chain, comprising: a plurality of pairs of neighboring composite links, the links of each pair being pivotable relative to each other and each link including a stack of plates; and a plurality of coupling units, one for each pair of links and each pivotably connecting the respective pair of links, each of said units including at least two adjacent coupling elements and at least some of said plates having windows for the respective coupling elements, at least some of said coupling elements being rockable about axes normal to the respective plates and having rounded external surfaces contacting rounded internal surfaces of the respective plates in said windows thereof, said rounded surfaces having radii of curvature and the ratio of the radii of curvature of said internal surfaces to the radii of curvature of said external surfaces being greater than one, and wherein points of contact between said rounded surfaces of different radii are in low critical stress areas.