| 摘要 |
<p>The card index is convertible into a document-display, being of any suitable materials. It comprises a rectangular box with two rounded lateral apertures (5) joined by a slot which forms a tongue in the box bottom. A hinging variable-angle plate (2) is mounted on the bottom, and the cover (3) forms a heptahedron, with two parallel pentagonal sidewalls extending above the box. Two sides of each pentagon include a riqht angle and are joined to the same sides on the other wall by rectangular plates glued, welded or screwed into place, to form a sealed cover. The shortest sides of these pentagonal faces are joined by a rigid strip (4) below the sole plate and acting as a hinge lever.</p> |
