Method for the manufacture of a spring-interior mattress
OwnerRobert Plasseinventor
Life of this patent
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Abstract
A method of making a mattress comprising a framework of metal springs sandwiched between first and second sheets of foam, comprises applying a strip of foamable resin mixture around the periphery of the upper surface the first sheet of foam being disposed horizontally, and then laying the framework on the upper surface. The strip is allowed to foam to engulf at least a portion of the lower part of the framework which is thus adhered to the first sheet. The framework is then similarly adhered to the second sheet.
Claims7
A method of manufacturing a mattress comprising two sheets of foam on either side of a metal framework comprising springs, the method comprising the following successive stages:
- a sheet of pre-fabricated foam is placed such that its inner side is turned upwards and is substantially horizontal;
- a strand of resin forming a foam-producing mixture is applied along the periphery of the inner side of this pre-fabricated sheet of foam;
- the metal framework is placed on said sheet of foam;
- the foam of the resin strand is allowed to form and expand freely, such that the latter at least partly surrounds the lower coil of the peripheral springs of the framework, in order to fix said framework to the sheet;
- and
- repeating the same operations with a second sheet of pre-fabricated foam and the same framework which is already integral with the first sheet of foam, after said framework has been turned over.
Dependencies are inferred from the claim text.