Plate of plastic material with fastening means for loose-leaves

Claim 1

A LOOSE-LEAF BINDER FOR SHEET MATERIAL PROVIDED WITH HOLES, COMPRISING: A BACK; A PLURALITY OF PAIRS OF RELATIVELY RIGID PRONG MEANS UPSTANDING FROM SAID BACK; SEPARATE RESILIENT HINGE MEANS FOR EACH PAIR PIVOTALLY CONNECTING AT LEAST ONE PRONG MEANS OF EACH PAIR OF SAID BACK; SAID HINGE MEANS HAVING A TRAPEZOIDAL PORTION OF LESS THICKNESS THAN SAID PRONG MEANS IN THE PLANE OF PIVOTAL MOVEMENT ABOUT SAID HINGE MEANS FORMING A GAP THAT COULD CLAMP THE SHEET MATERIAL AND OF INCREASED WIDTH RELATIVE TO SAID PRONG MEANS NORMAL TO THE PLANE OF PIVOTAL MOVEMENT ABOUT SAID HINGE MEANS; EACH OF SAID PRONG MEANS HAVING A FREE TERMINAL END TO EXTEND WITHIN THE HOLES OF THE SHEET MATERIAL; SAID FREE TERMINAL ENDS OF EACH PAIR OF PRONGS NORMALLY ENGAGING EACH OTHER TO PREVENT THE SHEET MATERIAL FROM MOVING OFF OF SAID TERMINAL ENDS; THE RESILIENCY OF SAID HINGE MEANS BEING SUFFICIENT TO ALLOW SAID TERMINAL ENDS TO BE FORCED AWAY FROM EACH OTHER FOR PLACEMENT AND REMOVAL OF SHEET MATERAIL ON AND FROM, RESPECTIVELY, SAID PRONG MEANS; PLASTIC PROJECTION MEANS MOUNTED ON SAID BACK CLOSELY ADJACENT TO SAID HINGE MEANS FOR SPACING THE SHEET MATERIAL FROM SAID BACK BEYOND THE PORTION OF LESS THICKNESS FOR PREVENTING THE SHEET MATERIAL FROM ENTERING SAID PORTION OF LESS THICKNESS AND PREVENTING THE SHEET MATERIAL FROM BEING CLAMPED BY SAID HINGE MEANS; SIDE COVER PANEL