| 摘要 |
The cover bottom wall abuts the cassette bottom from below while the top wall rest on the cassette upper side. The rear wall connects the top and bottom cover wall on the side with hinged connection. The cassette is fastened to the bottom wall. The top and rear walls can move freely when the cassette is opened. The top and bottom cover walls are of double thickness relative to the rear wall. They consist preferably of two sheet material layers which are connected together at the edge away from the rear wall. If the rear wall is also of two-layer structure, the outer layer forms one piece structure with the outer layers of the top and bottom walls, while the inner layer forms a one piece structure with the inner layer of either the top, or the bottom wall. |
