| 摘要 |
The essence of the technique is to superimpose a shaped elastic membrane/cover over a seat shell and lock the membrane to the edge of the seat shell with a channel-section trim. The uppermost edge of the cover is left temporarily unattached to the seat so an incipiently-reacting foam, mixed in a volume predetermined to be in excess of what is necessary, can be poured between the membrane and the shell. The subject is then seated and the foam expands to provide positive support for the anatomy and fill all the voids between the body's impression in the membrane and the seat shell, thereby making a full-contact mold of the body. Overflow is allowed to escape at the uppermost portion of the seat where it is captured in a bag that also serves to contain noxious chemical vapors. Foam may be of a rigid or resilient type to vary the support and cushion provided. The chemical action of the foam creates an adhesive bond between the membrane, foam, and the shell, and when the outer surface of the membrane incorporates a stretchable fabric finish, the method produces an attractive upholstered appearance simultaneously with the custom fit. If the bond between the reacting foam and the shell is prevented by a mold release agent or plastic sheet, a removable form is produced allowing the fitting of different drivers in the same shell.
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