Push Back Racking is a form of pallet flow rack in which pallets are stored two, three, four or five deep onto a telescopic trolley system. Using a fork lift truck, pallets are both loaded and unloaded from the same aisle. The palletized load is deposited on the top trolley. When the next pallet is positioned this previous trolley is pushed backwards into the storage lane. This process is repeated for up to five pallets deep. As soon as a pallet is withdrawn from a lane, the remaining pallets stored behind are automatically fed forward under the force of gravity. The system as in the case of Drive-In racking operates on a first in – last out principle (FILO principle), with the added advantage that only one level per lane has to be emptied to get to the rearmost pallet. The same system can be configured for structures with more than 5 pallets stored in depth. Instead of the telescopic trolleys system, however multiple braked roller beds are assembled in the racks depth at a gradient. The operating principle remains the same.
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