Push-back pallet rack systems are designed
around the principle of organizing space by depth rather
than width. This depth arrangement greatly reduces aisle
space and increases storage density. In this
configuration, each row is multiple pallets deep, and
often has wheeled carts that fit onto rails to take
advantage of gravity, saving enormous amounts of energy
for moving heavy pallets. When a forklift sets the
pallet onto the cart, it drives forward and causes the
pallet to bump the next pallet, causing the entire row
of pallets to roll backwards. When removing a pallet
from the front position the remaining pallets
immediately stage themselves forward so that the next
available pallet can be accessed.