Medical bed with sheet retaining means

Claim 1

A medical bed of the type wherein a sheet covers a solid particle media in a bed body and compressed air is supplied into said bed body to fluidize said solid particle media whereby a patient lying on said sheet may be supported, said bed comprising; a box-shaped bed body filled with a solid particle media, said bed body having a peripheral flange; a packing member covering a surface of said peripheral flange; a gas-permeable filter sheet placed over said bed body and packing member; sheet-retaining hand rails for pressing said sheet against said packing member whereby said solid particle media are sealed in said bed body, said hand rails having a plurality of hook portions extending through said sheet, said packing member and said flange; and clamping means for pulling said hook portions to urge said hand rails uniformly against said sheet around the entire periphery of said flange, said clamping means comprising latch lock coupling means mounted on an exterior of said bed body and including loop-like coupling means for engaging said hook portions.