| 摘要 |
Apparatus for fabricating a cushion contoured and fitted to the sitting support surfaces of a user includes a generally flat plate having a plurality of apertures in the upper surface thereof. Each aperture is coupled to and continuous with a duct within the flat plate, with all of the ducts coupled to a vacuum source by appropriate fittings and hoses. Mounted to the upper surface of the flat plate and in sealed engagement therewith are a plurality of rails arranged so as to form a generally rectangular structure, or form, open at the top and closed about its lateral periphery. A plaster positive having a generally flat lower surface and an upper surface conforming with the support surface to which the cushion is to be fitted is positioned within the rectangular form and a flexible, nonporous membrane is positioned over the open form and in contact with that portion of the flat plate therein as well as with the plaster positive. The vacuum source then evacuates the duct system drawing the membrane in tight-fitting contact with the plaster positive and the upper surface of the flat plate. A self-skinning polyurethane foam is then poured into the form so as to cover the membrane and is allowed to cure. Release of the vacuum allows the hardened polyurethane cushion to be removed from the form and the membrane to be separated from the plate as well as from the cushion which has a flat lower surface and an upper surface contoured in accordance with the plaster positive and the sitting support surface of the user.
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