Importance

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Abstract

An automated storage and retrieval system includes a track system including a first set of parallel tracks arranged in a horizontal plane and extending in a first direction, and a second set of parallel tracks arranged in the horizontal plane and extending in a second direction which is orthogonal to the first direction, which first and second sets of tracks form a grid pattern in the horizontal plane comprising a plurality of adjacent grid cells, each grid cell including a grid opening defined by a pair of neighboring tracks of the first set of tracks and a pair of neighboring tracks of the second set of tracks; a plurality of storage columns each column being arranged to store a respective stack of storage containers; and a plurality of container handling vehicles for lifting and moving storage containers stacked in the stacks. The storage columns are located beneath the track system. Each storage column is located vertically below a grid opening. Each container handling vehicle is configured to move on the track system above the storage columns. The system further includes at least one transfer vehicle, arranged to transport at least one storage container in a horizontal plane which is located above the container handling vehicles, and at least one storage container lift assembly comprising at least one movable lifting member. Each movable lifting member is arranged to receive at least one storage container from the transfer vehicle, and the at least one movable lifting member is arranged for vertical movement to and from the plane where the transfer vehicle of the system operates.

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First Claim