Abstract: An article sorting and retrieval system for use in warehouses and distribution centers wherein articles are stored in vertical racks with open-sided storage bins. The system includes a linearly extensible lower conveyor assembly adapted to transport items parallel to the rows of storage bins and a vertically movable upper conveyor assembly located above and parallel to the lower conveyor assembly and adapted to convey articles in a direction opposite to that of the lower assembly and to be raised and lowered between an upper position and a lower position as desired so as to service all of the bins in each of the rows of bins. Another conveyor assembly is provided for conveying articles vertically between one end of the lower conveyor assembly and one end of the upper conveyor assembly and for reversing the direction of travel of the articles during that vertical movement.

Abstract: A storage and dispensing apparatus for articles, containers and the like includes two opposing vertical stacks of shelf assemblies pivotally mounted relative to support structure for rotation between an upwardly tilted receiving and storage position in a downwardly tilted discharge position. Each shelf assembly includes a transfer stop and transfer control for retaining the shelf assembly in the receiving position until the next lower shelf assembly is prepared to receive a container. Each shelf assembly can also include a receiving stop for retaining the shelf assembly in the receiving position until a container is fully disposed on the shelf surface. The shelf assembly can further include a discharge drive for overcoming static between a stored container and the underlying shelf surface during transfer operations. The apparatus automatically advances container downwardly through the stack to the lowest unfilled shelf for selective dispensing at the bottom of the stacks.