Abstract: A roller chain, having an elastic annular member being fitted adjacent each end of a pin and between a pin link plate and a roller link plate for sealing lubricating oil present in the space between the pin and the bushing, comprises a bushing extended on each end thereof so as to form an extended portion projecting outwards from the roller link plate by a length slightly smaller than the thickness of said annular member, said extended portion being provided with a tapered face on the outer periphery thereof, and said annular member being fitted on said outer periphery so as to be in contact with said tapered face and maintained in lightly pressurized contact with the pin link plate and the roller link plate.

Abstract: An improved apparatus for cooling hot pellets discharged from a kiln or the like with water is presented wherein the pellets are charged through a chute into a water cooling bath while avoiding oxidation thereof. The cooling bath is covered with a hood and the pressure difference between the chute and hood is controlled during the process.