| 摘要 |
<p>The folding caravan is rigid when erect and has a lower rectangular frame which is horizontal and open at the top. This forms the floor and side supports. There are also four side panels, hinged at the bottom to the four sides of the base. These panels can be folded horizontal to the base. There is also an upper frame, rectangular and open at a base, forming the roof. The parts are opened up and folded back by a synchronised mechanical action.</p> |
