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US 3,943,215 AGranted
Method for the production of a foam cushion with a covering
AssigneeBayer Aktiengesellschaft
InventorsHorst Grune, Ulrich Knipp
Life of this patent
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Abstract
A foam cushion with a covering of an elastic textile sheet structure is produced in a vacuum deep-draw mould by holding the sheet structure down during the suction cycle with a hold-down plate, but allowing it to slip through locally.
Claims5
In a process for the production of a foam cushion with a covering of an elastic textile sheet structure by intimately conforming without permanent deformation said structure to the interior of a complexly contoured mold the improvement comprising
- a. draping the textile sheet structure backed by a sealing layer over the vacuum mold;
- b. holding the periphery of said sheet structure and sealing layer against the periphery of the mold cavity;
- c. applying a suction force through the mold to stretch said sheet structure and sealing layer so that they are drawn into the major surfaces of the mold interior until the elastic limit of the sheet structure and sealing layer is reached;
- and
- d. allowing the sheet structure and sealing layer to slip at portions of the mold cavity periphery while applying suction force so that the sheet structure fully conforms to the interior surface of the mold.
2 more elements
Dependencies are inferred from the claim text.