Patent ID: 8617014

Claim:
A chain drive comprising: a sprocket; a drive for driving said sprocket; a further sprocket; a conveyor chain wrapped around said sprocket and said further sprocket, said conveyor chain being provided with a plurality of attachment parts, said attachment parts being escalator steps or pallets; said drive being configured for a polygonally-compensated driving of said sprocket, said drive including: two pulley wheels; a pulling device running on said two pulley wheels with an upper run and a lower run; and a tensioning device disposed to act on said pulling device, said tensioning device including: a first non-circular compensation wheel disposed to come into contact with said upper run; a second non-circular compensation wheel disposed to come into contact with said lower run; a rocker rotatably supporting said first compensation wheel and said second compensation wheel; and a fixed bearing pivotally supporting said rocker.