| 摘要 |
<p>A bed comprising a mattress supporting frame supported on two pair of legs, the lower end of each pair being provided with an extendable portion so that the height of the frame above the floor may be varied, an operating shaft associated with each pair of legs, each shaft being rotatably mounted on or adjacent the associated pair of legs, an arm fixed to and projecting radially from the operating shaft, said arm being connected to the extendable portion of the legs associated with the operating shaft by one or more connecting links so that when a turning force is applied to the operating shaft to effect rotation thereof the height of each of the pair of legs associated therewith is decreased or increased and the mattress supporting frame is lowered or raised.</p> |
