ES422815A1 - Safety lock loose-leaf ring binder mechanism - Google Patents

Abstract

Refinements introduced in a loose-leaf binding mechanism that includes an elongated elastic box, a pair of relatively rigid but elastic elongated hinge plates, rotatably mounted within the box, the outer longitudinal edge of each plate defining its axis of rotation, with the inner longitudinal edges of the plates abutting each other for all the angular positions of the hinge plates, at least one spike on each hinge plate, projecting outside the box, each spike being one of the hinge plates in alignment with a tine of the other hinge plate, and an activator means for moving said hinge plates between a closed tine position where each pair of aligned tines forms an essentially closed ring or loop to retain the single blades and an open tine position where each pair of aligned tines opens, the tines moving apart, to allow insertion and removal of loose sheets, the refinements of which consist of the activator means comprising: (a) a rotatably mounted lever member positioned in position in an opening made in the hinge plates and around which it is operated in rotation ; (b) a hinge plate depressing means, mounted or arranged on said lever member, for moving the hinge plates by bringing them from said open tine position to said closed tine position by rotating the lever member in a certain felt by traversing a first pre-set arcuate segment of the movement path of the lever member; (c) a plate lifting means, mounted or arranged on said lever member, to move the hinge plates taking them from said closed tine position to said open tine position upon rotation of the lever member in the opposite direction , running said first arched segment; (d) a certain part of said lever member being able to move selectively along a second predetermined arched segment of the lever member movement path, between a first position in which it is wedged strongly between the box and the hinge plates in the position of closed tines, in such a way that an imaginary line that interconnects any contact point between said first-mentioned part and the box with any contact point between said first part and the chamela plates is oriented in an attitude tilted upwards as it extended outwards, and a second position in which it is wedged tightly between the box and the hinge plates in the position of closed tines, in such a way that said imaginary line is oriented in an attitude of inclined upward as it extends inward, said second arcuate segment being prefixed contiguous to said first arcuate segment and also being s on the inside of said first segment; and (e) a locking stop means to prevent rotational movement of the lever member inwardly out of the wedge-engaging position between the box and outward arched hinge plates, said means for stop (i) a stationary seating surface mounted on the box in the movement path of said lever member, a surface that is along the geometric axis or center line of the box and at a substantial distance from either side of this axis, and (ii) a retaining element mounted on said lever member for application along the geometric axis of the box and for application, at a substantial distance to either side thereof, in contact with said surface seat when the first mentioned part of the lever member moves moving to said second wedged position. (Machine-translation by Google Translate, not legally binding)