| 摘要 |
A semi-fluid mattress using a mass of granular material to support a user has reversible transferring means and fluidizing means to locally control the granular material. The reversible transferring and fluidizing means are independently controllable at plural locations along a longitudinal extent or dimension of the mattress, so that each region of the body can be independently cared for. The reversible transferring means is used to achieve fitness for natural posture by controlling the distribution of the accumulative height of the granular material, and transfers the granular material between a transverse middle portion and transverse side portions of the mattress. The fluidizing means is used to achieve small partial oppression by controlling local fluidity of the granular material. In a preferred embodiment, reversible rotary blade devices, placed at spaced locations along a longitudinal dimension of the mattress, are used for the above two means by changing their operational mode. The reversible rotary blade devices each have a shaft with blades, a rotatory axis of the shaft being oriented at an angle of from 60 to 120 degrees relative to a longitudinal axis of the mattress. An arrangement of the blades extends over each of two zones on the shaft, the length of each zone being longer than 25% of the transverse size of the mattress and these zones being located within respective opposite complementary halves of a transverse dimension of the mattress, with screw directions of the blade in the different zones being opposite.
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