Threading device for storage maps. - using two plastics threading tongues and rectangular perforated cover plate

摘要

Cover plate for storage maps unit, of hinged rectangular formation, has a longitudinal hinged section, and aligning recesses. A cover plate (1) has a rectangular shape and includes a bottom part (2) and top part (3), also a longitudinal hinge section (4) of hardening plastics. The bottom part has a recess (5) over part of its height. The top part has a corresponding recess (6). In the closed position of the plate, the recesses (5,6) together form a bore for the threading tongues.