Laminated visco-elastic support
View Patent ↗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.
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/m 3 and no greater than 120 kg/m 3 ; 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/m 3 and no greater than 120 kg/m 3 ; 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/m 3 and no greater than 120 kg/m 3 ; 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.