FIELD: copybooks with metallic loose-leaf binder.
SUBSTANCE: arc gear of binder has rectangular, round at ends, platform, which is made of bent metallic stripe with slits for setting rings, with edges bent inwards, which form a hollow in its lower portion, inside which two par steel stripes are posed, with semi-rings rigidly held by them, forming a locked ring when closed. Arc gear has: 7 detachable rings, mounted with step 40 mm; 10 detachable rings, mounted with 26,6 mm step; 13 detachable rings, mounted with 20 mm step; 16 detachable rings, mounted with 16 mm step, providing increase of allowed loads, applied to page during turning. Step of rings is selected so, that any paper sheet of A4 format with number of mounting opening 4,7,10,13,16, positioned along its long side, can be bound, using standard four-ring binder.
EFFECT: higher durability.
10 dwg
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