A laminated support for pressure-relief comprising an upper layer of visco-elastic foam, a middle layer of visco-elastic foam having a greater hardness, and a bottom layer of highly resilient polyurethane foam. These layers are sandwiched between two layers of reticulated filter polyurethane foam.
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The invention claimed is: 1. A layered bed mattress for pressure-relief of a user, the bed mattress comprising: a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient t
The invention claimed is: 1. A layered bed mattress for pressure-relief of a user, the bed mattress comprising: a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of an adult user, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam having a density of no less than 50 kg/m3 and no greater than 120 kg/m3; and a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer having a substantially uniform undeflected thickness greater than that of the first foam layer. 2. The layered bed mattress as claimed in claim 1, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user. 3. The layered bed mattress as claimed in claim 2, wherein the first foam layer is adhered to the second foam layer. 4. The layered bed mattress as claimed in claim 2, wherein the second foam layer has a hardness greater than that of the first foam layer. 5. The layered bed mattress as claimed in claim 3, wherein the second foam layer has a hardness greater than that of the first foam layer. 6. The layered bed mattress as claimed in claim 2, wherein the second foam layer comprises visco-elastic foam. 7. The layered bed mattress as claimed in claim 1, wherein the first foam layer is adhered to the second foam layer. 8. The layered bed mattress as claimed in claim 7, wherein the second foam layer has a hardness greater than that of the first foam layer. 9. The layered bed mattress as claimed in claim 7, wherein the second foam layer comprises visco-elastic foam. 10. The layered bed mattress as claimed in claim 1, wherein the second foam layer has a hardness greater than that of the first foam layer. 11. The layered bed mattress as claimed in claim 1, wherein the second foam layer comprises visco-elastic foam. 12. A layered bed mattress for pressure-relief of a user, the bed mattress comprising: a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of an adult user, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam having a density of no less than 50 kg/m3 and no greater than 120 kg/m3; and a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer comprising visco-elastic foam. 13. The layered bed mattress as claimed in claim 12, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user. 14. The layered bed mattress as claimed in claim 13, wherein the first foam layer is adhered to the second foam layer. 15. The layered bed mattress as claimed in claim 13, wherein the second foam layer has a hardness greater than that of the first foam layer. 16. The layered bed mattress as claimed in claim 14, wherein the second foam layer has a hardness greater than that of the first foam layer. 17. The layered bed mattress as claimed in claim 12, wherein the first foam layer is adhered to the second foam layer. 18. The layered bed mattress as claimed in claim 17, wherein the second foam layer has a hardness greater than that of the first foam layer. 19. The layered bed mattress as claimed in claim 12, wherein the second foam layer has a hardness greater than that of the first foam layer. 20. A layered bed mattress for pressure-relief of a user, the bed mattress comprising: a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of an adult user, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam having a density of no less than 50 kg/m3 and no greater than 120 kg/m3; and a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer having a density less than that of the first foam layer and a hardness greater than that of the first foam layer. 21. The layered bed mattress as claimed in claim 20, wherein the second foam layer is thicker than the first foam layer. 22. The layered bed mattress as claimed in claim 21, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user. 23. The layered bed mattress as claimed in claim 21, wherein the first foam layer is adhered to the second foam layer. 24. The layered bed mattress as claimed in claim 21, wherein the second foam layer comprises visco-elastic foam. 25. The layered bed mattress as claimed in claim 20, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user. 26. The layered bed mattress as claimed in claim 20, wherein the first foam layer is adhered to the second foam layer. 27. The layered bed mattress as claimed in claim 20, wherein the second foam layer comprises visco-elastic foam.
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이 특허에 인용된 특허 (90)
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