Body support assembly
The invention is directed to a body support assembly comprising (i) an upper cushion zone and a lower cushion zone and separated by a separation sheet. The cushion zones comprise of a compressible material which is permeable for air in all directions, (ii) a first flow path for ambient air comprising an air inlet opening at the bottom surface of the support assembly, air displacement means, a first heat exchanger and a single or separate air outlet opening at the bottom surface of the support assembly, (iii) a second flow path for air comprising an air inlet, air displacement means, a second heat exchanger, through the lower cushion zone, through openings in the separation sheet and through the upper cushion zone and multiple air outlets in the top surface. The heat exchangers are part of a Peltier effect unit positioned within the cushion volume.
1 . A mattress for supporting a human body during sleep comprising:
a top surface designed for contact with the human body and being air permeable, where the top surface comprises an end for placement of the head of the human body and an end for placement of the feet of the human body,
a spaced away bottom surface defining a cushion volume with side walls, where the air permeability of the top surface is greater than air permeability of the bottom surface and greater than air permeability of the side walls,
wherein the cushion volume comprises: an upper cushion zone nearest to the top surface, a lower cushion zone, separated by a flexible separation sheet, wherein the upper cushion zone comprises a random loop bonded structure made of thermoplastic resin while the lower cushion zone comprises Bonnell springs, and wherein the air permeability of the top surface is at least 3 times more air permeable than the side walls and the bottom surface, as measured in accordance with ASTM D 737-96.
2 . The mattress for supporting a human body during sleep according to claim 1 , wherein the upper cushion zone and the lower cushion zone comprise of a compressible material which is permeable for air in all directions, and where the air permeability of the cushion material is greater than 50 cm3/s/cm2 as measured by Standard Test Method for Air Permeability of Textile Fabrics, ASTM D737-96.
3 . The mattress for supporting a human body during sleep according to claim 1 , the air permeability of the top surface is at least 4 times more air permeable than the side walls and the bottom surface, as measured in accordance with ASTM D 737-96.
4 . The mattress for supporting a human body during sleep according to claim 1 , wherein the random loop bonded structure has an average apparent density falling within a range of 0.005 g/cm3 to 0.200 g/cm3.
5 . The mattress for supporting a human body during sleep according to claim 1 , wherein the thermoplastic resin of the random loop bonded structure is a polyester thermoplastic elastomer.
6 . The mattress for supporting a human body during sleep according to claim 1 , wherein the random loop bonded structure is has between 550 and 1150 bonded points per gram.
7 . The mattress for supporting a human body during sleep according to claim 1 , wherein the thermoplastic resin of the random loop bonded structure is a copolymer composed of an aromatic polyester as a hard element and an aliphatic polyether as a soft element.