Mattress having a spring unit with a single upper peripheral border rod locked within a chamber of a synthetic foam plastic material housing
View Patent ↗A mattress includes a chamber defined by upper and lower panels and a peripheral border all constructed from synthetic polymeric/copolymeric plastic material and housing therein a spring unit. The spring unit includes a plurality of springs having upper ends connected to a peripheral border rod. The spring unit is devoid of a peripheral border rod at lower ends of the springs. Upper edges of the spring unit can be deformably gripped by the upper panel, the peripheral border and/or both to prevent “swimming pool” effect.
1. A mattress comprising a single polygonal border defined between upper and lower terminal peripheral edge portions and upper and lower panels collectively defining a substantially closed chamber, said border and panels being constructed from synthetic plastic material, means for bonding said upper panel to said border upper terminal peripheral edge portion, means for bonding said lower panel to said border lower terminal peripheral edge portion, a spring unit housed substantially in said chamber, said spring unit including a plurality of springs each having opposite upper and lower loop portions positioned substantially adjacent the respective upper and lower panels, an upper peripheral border rod located substantially adjacent said upper panel, means for securing at least selective ones of said springs to said upper peripheral border rod along the periphery of said upper peripheral border rod, said spring unit being devoid of a lower peripheral border rod at said springs lower loop portions, means for peripherally interlocking said upper peripheral border rod substantially against movement relative to said border and upper panel, said upper peripheral border rod being substantially interlocked against lateral and longitudinal movement by an upper inner peripherally extending distorted corner of said chamber defined by said upper panel and said polygonal border in interlocking relationship with said upper peripheral border rod, and said spring unit being devoid of fabric pockets adapted to house springs.
2. The mattress as defined in claim 1 wherein the spring unit includes a body zone located between opposite head and feet zones, and the springs in the body zone are located closer together than the springs in either of the head and feet zones.
3. The mattress as defined in claim 1 wherein the spring unit includes a body zone located between opposite head and feet zones, and the springs in the body zone are located closer together than the springs in either of the head and feet zones, and all said springs are of substantially the same gauge material.
4. The mattress as defined in claim 1 wherein said polygonal border is made of at least two rails bonded to each other.
5. The mattress as defined in claim 1 wherein said polygonal border is made of at least two rails bonded to each other and to said upper and lower panels.
6. The mattress as defined in claim 1 wherein said polygonal border is made of at least four rails bonded to each other.
7. The mattress as defined in claim 1 wherein said polygonal border is made of at least four rails bonded to each other and to said upper and lower panels.
8. The mattress as defined in claim 1 wherein said spring unit is further defined by opposite head and foot ends and opposite sides, said springs are disposed in substantially parallel head to foot end side-by-side rows, and a helical lacing uniting together the springs upper loop portions of immediately adjacent rows between said opposite head and foot ends.
9. The mattress as defined in claim 1 wherein said synthetic plastic material of said border and panels is foam.
10. The mattress as defined in claim 1 wherein said synthetic plastic material of said border and panels is polyurethane foam.
11. The mattress as defined in claim 1 wherein said peripherally interlocking means includes said upper peripheral border rod being in intimate bearing engagement with an opposing inner upper peripheral surface of said border whereby an upper side of the spring unit is substantially confined against lateral movement to prevent a swimming pool effect.
12. The mattress as defined in claim 1 wherein said peripherally confining means includes said peripheral border rod being in intimate bearing engagement with an opposing inner upper peripheral surface of said border and an immediately adjacent lower peripheral surface of said upper panel whereby an upper side of the spring unit is substantially confined against lateral movement to prevent a swimming pool effect.
13. The mattress as defined in claim 1 wherein said peripherally interlocking means includes said upper peripheral border rod being in intimate bearing engagement with an opposing inner upper peripheral surface of said border whereby an upper side of the spring unit is substantially confined against lateral movement to prevent a swimming pool effect, and said border opposing inner upper peripheral surface is deformed by and interlocked with said peripheral border rod.
14. The mattress as defined in claim 1 wherein said peripherally interlocking means includes said upper peripheral border rod being in intimate bearing engagement with an immediately adjacent lower peripheral surface of said upper panel whereby an upper side of the spring unit is substantially confined against lateral movement to prevent a swimming pool effect.
15. The mattress as defined in claim 14 wherein said immediately adjacent lower peripheral surface of said upper panel is deformed by and interlocked with said upper peripheral border rod.
16. The mattress as defined in claim 12 wherein the opposing inner upper peripheral surface of said border and the immediately adjacent lower peripheral surface of said upper panel are each deformed by and interlocked with said upper peripheral border rod.