| 摘要 |
<p>Closure is intended for a wall opening and permits a truck with closed cargo space backing in for (un)loading whilst maintaining a seal around the outside of the truck. It comprises panels in flexible material which are secured along the vertical sides and the horizontal upper boundary of the opening. At least the two side panels are directly or indirectly secured to the sides via vertical spring-return hinges whilst these panels each consist of a flexible plate, e.g. in 2.5 mm thick PVC, containing one or more inserts with spring action in the direction at right angles to the hinge pivot, e.g. an insert layer in polyamide.</p> |
