Patent ID: 11167921

Abstract:
An automated storage and retrieval system comprising a three-dimensional grid (4) comprising a plurality of storage columns (5) in which storage containers are stored one on top of another in vertical stacks, and at least one port (28, 29) through which the storage containers can be transferred out of and/or into the grid; and a plurality of container handling vehicles (9) which are operated laterally on the grid for retrieving storage containers from and storing storage containers in the storage columns, and for transporting the storage containers laterally across the grid. The grid comprises a plurality of transfer columns (36, 37) for temporarily storing storage containers when in transit between the storage columns and the at least one port, wherein the container handling vehicles are arranged to transport the storage containers between the storage columns and the transfer columns, and wherein a port access vehicle is arranged to transport the storage containers between the transfer columns and the at least one port in a plane located above the container handling vehicles.