| 摘要 |
A free-standing, self-supporting bed has a movable platform supported by a stationary frame. The platform may be elevated vertically to a stored position higher than head height when the bed is not in use. Counterweights allow the platform to be elevated and lowered with a minimum of effort. In the stored position the platform is suspended from the frame by redundant lines passing over pulleys. In the sleeping position the counterweights are suspended from the frame and the platform rests on the frame and may be secured thereto by latching devices operable from one side of the bed. The lines and pulleys are arranged so that the counterweights have a 2:1 mechanical advantage with respect to the platform and so that, during raising or lowering of the platform, forces keeping the ends of the platform horizontal are automatically exerted thereon.
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