Abstract: A semi-automated warehousing system for unitized loads, such as load carrying pallets, which are retained in storage racks arranged in a multiple lane, multiple tier array is provided. The system employs a man operated stacker crane that travels upon a fixed rail and serves as a host vehicle for a ratio controlled transfer vehicle which is powered by a rechargeable battery. An elevator, which forms part of the crane is mounted between masts of the crane and a man carrying cab is secured to the elevator. The transfer vehicle can move laterally away from the crane, in either direction, in response to radio command signals controlled by the operator in the cab. The transfer vehicle rides on support rails in the storage racks and, upon command, deposits or picks up a pallet. The battery which powers the transfer vehicle is recharged each time the vehicle returns to the elevator portion of the crane.

Abstract: In a storage system, a plurality of storage racks are provided, the racks being movable to enable selection of passageways therebetween. A carriage is conveyable along the ends of the racks by individual conveyors supported at the rack ends, the carriage being movable into passageways formed between the racks. The racks or carriages supporting the racks are provided with rails mounted to support the movable carriage when it is positioned in any selected passageway. A fork lift device is provided on the carriage to enable selection of a vertical position in the racks.