Abstract: The invention provides an endless conveyor designed to provide in a multiplicity of tiers of chain length racks which carry removable material carriers in upright orientation. In one aspect, tensioning of the chain is performed by providing a shaft, for a sprocket connected to the end of a chain length, slidably mounted. The drive chain for supplying torque to the drive shaft is directed and tensioned to tension the conveyor chain. In another aspect the travelling rack is designed with longitudinal recesses between support members so that stationary cantilever members may be inserted therebetween for unloading or loading. In another aspect there is provided a loader that tilts in synchronism with the conveyor and in juxtaposition to a conveyor rack during the loading of a pan on the rack.