A conveyor for transporting loads between vertically spaced stations. A plurality of shelves are pivotally connected to a pair of chains which are power driven to carry the shelves to the stations. The shelves are tilted at the unloading station for gravity discharge of the load from the front and are tilted in the opposite direction at the loading station to slide the load toward the rear to prevent escape from the front during transport. Guide devices are provided at the tilting axis to prevent deflection of the chain by the tilting forces.