Patent ID: 6547557
Filing Date: 2003-04-15
Classification: F27D

Abstract:
A water-coolable furnace roller for conveying goods to be transported through a roller hearth heating furnace, the furnace roller comprising:a shaft configured to be supported external to the furnace and to be driven in rotation; the shaft having an outer contact surface; support rings having a receiving bore, respectively, and arranged with the receiving bore on the shaft, wherein the support rings form a conveying plane; wherein the receiving bore has an inner contact surface and wherein at least one of the inner and the outer contact surfaces has a shape of a polygon contour of substantially constant diameter with fitting surfaces defining an orbiform curve, wherein the fitting surfaces have a deviation from a circular shape and wherein the deviation provides a self-locking action when torque is transmitted between the support ring and the shaft, and wherein the deviation of the fitting surfaces from the circular shape is substantially 4% to 5%.