US Patent 7290427 Clamp ring with pre-heater

A clamp ring for a forge die, the clamp ring comprising a substantially solid ring portion having a channel about the outer diameter and at least one flame aperture formed between the inside and the outside diameter and in fluid communication with the channel and a band portion having a inside diameter slightly larger than the outside diameter of the ring wherein the band portion is sized to fit over said ring portion, the ring portion having at least one aperture and a conduit attached thereto, whereby said band it attached to said ring such that combustible gas flows through said conduit into said channel and out of the at least one flame aperture.