Patent ID: 7950331

Claim:
A guidance arrangement for a mobile storage system including a plurality of storage units, comprising: an axial guide mounted within a floor, wherein the axial guide includes an open cavity accessible from above a top surface of the floor; a pair of cover plates secured over a portion of the open cavity thereby defining a relatively narrow slot; a drive rail mounted within the floor and extending parallel to the axial guide, wherein a top surface of the drive rail is flush with a top surface of the floor; a roller arrangement associated with the axial guide and located within the open cavity, the roller arrangement including a plurality of roller member pairs; a rotatable drive wheel carried by one of the storage units, wherein the drive wheel is engaged with the top surface of the drive rail; a guide member extending downwardly from the storage unit and through the slot into the open cavity, wherein the plurality of roller member pairs are spaced to ensure that the guide member is in contact with more than one roller member at a time so as to guide movement of the storage unit as the storage unit is moved along the axial guide by movement of the drive wheel on the drive rail.