A storage structure comprises several storage racks the majority of which are movable between two end positions in order to form a passageway between two adjacent storage racks. An elongate locking device, for example a safety chain, is arranged between each pair of adjacent storage racks, one end of which is secured to one storage rack. The other end of the locking device is in the form of a contact member, which for starting a process of movement coacts with a stationary contact member in said storage rack. The contact member of the locking device is also connectable to the adjacent storage rack for mechanically locking the passageway which can be formed between the storage racks.
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