| 摘要 |
<p>The roller shutter case has a U-sectioned outer shell of lightweight panels and similar inner shell of wood fibre board, or similar, with an interconnecting filler in the form of a foamed layer. The inner shell is polygonal in cross-section, with edges slitted in a hinge shape and foam fillings in the slit cuts. The outer shell (1) consists of a single hard wood fibre board panel, with cross-sectional edges made in hinge form by a lengthways slit cut (3) in each. It can be deformed to assume a polygonal cross-section. There is an interval at all points between the inside of the outer shell and the outside of the inner one (2).</p> |
