US Patent 9404558 Heavy-duty chain

The invention relates to a heavy-duty chain containing chain-links comprising synthetic polymeric yarns, wherein when said chain is kept at least taut onto an essentially planar surface, each chain-link has an orthographic projection onto said planar surface, said projection having a foot print area (A), wherein the foot print areas denoted as A1 and A2 of every two adjacent links are in a relation 80% A2≦A1≦100% A2 with A1 being the smallest of said two areas and wherein the projection is done in such a way that the ratio of the foot print areas A2 to A1 is maximized.