Binding for perforated leaves made up of a singleplastic piece

Claim 1

A binding for perforated leaves comprising a body constituted as a single piece of plastic material including elongated base having opposite longitudinal edges, a first shutter hingeably connected to the base at one of the edges thereof, a second shutter hingeably connected to the first shutter, the hingeable connections between the base and first shutter and between the first and second shutters being provided by reduction of material thickness to form hinges there along, rings for perforated leaves constituted as individual half-rings on each of said shutters facing one another, said second shutter having a free edge proximate the other of said edges of the base, locking means on said free edge of the shutter and on said other edge of the base for locking the same together in a closed position of the binding, said half rings being positioned on the shutters for engageably closing in the closed position of the binding, and actuator means coupled to said second shutter in extending cantilever fashion for pivotably moving the second shutter with respect to the first shutter about the hinge connection therebetween to selectively release the locking means and then enable the first shutter to pivotably move with respect to he base about the hinge connection therebetween and provide an open position for the binding in which the half rings are separated from one another.