Retractable device for locking on rails suspension members of folders for vertical files

Claim 1

FOR USE IN FILES HAVING SUBSTANTIALLY HORIZONTAL LONGITUDINALLY EXTENDING, PARALLEL, SPACES, SIDE GUIDE RAILS FROM WHICH FILE FOLDERS ARE SUSPENDED IN A POSITION VERTICALLY DEPENDING FROM SAID RAILS, A FILE FOLDER COMPRISING, MEANS DEFINING AN ENVELOPE-TYPE FILE FOLDER HAVING OPPOSITE SIDE EDGES, AND AN UPPER EDGE, TWO SUSPENSION HOOKS EXTENDING OUTWARDLY AWAY FROM RESPECTIVE SIDE EDGES OF SAID FOLDER SUBSTANTIALLY ADJACENT SAID UPPER EDGE THEREBY TO RELEASABLY SUSPEND THE FOLDER FROM SAID GUIDE RAILS TRANSVERSELY OF A SPACE BETWEEN THE GUIDE RAILS, SAID HOOKS BEING SLIDABLE LONGITUDINALLY OF SAID RAILS TO ALLOW MOVEMENT OF SAID FOLDER IN A SUSPENDED CONDITION AXIALY OF SAID RAILS, LOCKING MEANS TO RELEASABLY LOCK SAID FOLDER RELATIVE TO SAID RAILS TO PREVENT MOVEMENT OF SAID HOOKS NORMAL TO SAID GUIDE RAILS SUFFICIENT TO UNHOOK SAID HOOKS FROM THE RAILS, SAID LOCKING MEANS COMPRISING A PAIR OF LUGS EXTENDING OUTWARDLY FROM SAID FOLDER SIDE EDGES AND HAVING AN UPPER EDGE CLOSELY ADJACENT RESPECTIVE HOOKS SPACED DOWNWARDLY THEREFROM AND OUTWARDLY FROM SAID SIDE EDGES SUFFICIENTLY TO UNDERLIE A RESPECTIVE RAIL WHEN SAID FOLDER IS DISPOSED DEPENDING FROM SAID RAILS, SAID LUGS BEING NORMALLY IN A POSITION SUBSTANTIALLY COPLANAR WITH SAID FOLDER AND COMPRISING A FLEXIBLE AND SUPPLE SYNTHETIC PLASTIC MATERIAL TO ALLOW THE LUGS TO BE BENT AT LEAST NORMAL TO A PLANE IN WHICH SAID UPPER EDGE OF SAID FOLDER IS DISPOSED AND HAVING MEMORY FOR SELF-RESTORATION TO SAID COPLANAR POSITION IN WHICH SAID LEGS WILL UNDERLIE SAID RAILS.