| 摘要 |
<p>The adjustable bunk, for use in caravans can be placed against the ceiling when not in use, and lowered to the required height on ropes when reqd. The box, which is a rigid box, is joined to the ceiling by one rope at each corner. Each rope passes over a vertical pulley fixed to the ceiling. The four ropes are joined to the middle of the ceiling on two horizontal pulleys with two ropes for each pulley. The four ropes can be fixed by tying them to a hook.</p> |
