Loose leaf binder construction

Claim 1

IN A RING BINDER, AN ELONGATED SPRINGY HOUSING FOR ATTACHMENT TO THE INSIDE OF THE BACK OF A BINDER, A PAIR OF PLATES DISPOSED IN SIDE-BY-SIDE RELATION WITHIN THE HOUSING RING SEGMENTS HAVING THEIR INNER ENDS CONNECTED TO THE PLATES, SAID RING SEGMENTS BEING CAPABLE OF PIVOTAL MOVE MENT BY INCLINATION OF THE PLATES TO SEPARATE THE RING SEGMENTS, SPACED RIVETS FOR ATTACHING THE HOUSING TO THE BACK OF A BINDER, A LOCKING BAR WITHIN THE HOUSING AND POSITIONED BETWEEN THE INNER ENDS OF THE RING SEGMENTS AND THE INSIDE SURFACE OF THE TOP OF THE HOUSING, SAID BAR BEING CAPABLE OF LONGITUDINAL SLIDING MOVEMENT RELATIVELY TO THE HOUSING, THE BAR HAVING SLOTS IN ENGAGEMENT WITH THE RIVETS AND LIMITING THE LONGITUDINAL SLIDING MOVEMENT OF THE BAR, THE BAR HAVING ITS OPPOSITE SIDE EDGES PROVIDED WITH SPACED NOTCHES, THE NOTCHES BEING POSITIONED TO REGISTER WITH THE INNER ENDS OF THE RING SEGMENTS TO PERMIT SEPARATING MOVEMENT OF THE SEGMENTS WHEN THE LOCKING BAR IS SO POSITIONED RELATIVELY TO THE HOUSING THAT A PORTION OF THE LOCKING BAR EXTENDS BEYOND ONE END OF THE HOUSING, SAID END OF THE HOUSING HAVING AN OPENING THROUGH WHICH A PART OF THE LOCKING BAR CAN EXTEND, THE LOCKING BAR BEING LONGITUDINALLY SLIDABLE TO AN EXTENT TO COMPLETELY HOUSE IT WITHIN THE HOUSING TO RENDER IT INACCESSIBLE AND DISALIGN ITS NOTCHES WITH THE INNER ENDS OF THE RING SEGMENTS, THE LOCKING BAR HAVING AN ANGULAR END PORTION MOVABLE THROUGH THE OPENING AND ARRANGED TO BECOME DISALIGNED WITH THE OPENING AFTER SAID END ENTERS THE HOUSING SO THAT IT CANNOT BE REACHED BY THE INSERTION OF A TOOL OR OTHER ABJECT THROUGH SAID OPENING