Beds – Bedclothing – And means to facilitate changing thereof
Patent
1994-01-21
1995-11-21
Grosz, Alexander
Beds
Bedclothing
And means to facilitate changing thereof
5468, 29718016, 297DIG8, A47C 2704
Patent
active
054674891
ABSTRACT:
An air permeable cushion includes a base plate with several holes formed therethrough, several spring units erected on the base plate, and a covering made of an air permeable cloth and enveloping the spring units therein. Each of the spring units includes a bellows tube and a coiled compression spring mounted within the bellows tube. The bellows tube has a bottom wall abutting against the base plate and provided with a check valve that is communicated with a corresponding hole of the base plate in order to prevent air in the bellows tube from flowing out of the same through the bottom wall while permitting air to flow from the corresponding hole of the base plate into the bellows tube through the valve, a top wall abutting against the covering and having several holes formed therethrough, and an accordion-like peripheral wall interconnecting the top and bottom walls so that, when pressure is applied on the covering, the bellows tube contracts, thereby causing air to flow through the covering via the holes of the top wall. When the pressure applied on the covering is released, the bellows tube expands by action of the spring, thereby sucking in air via the valve and the holes of the top wall.
REFERENCES:
patent: 2878012 (1959-03-01), Crites
patent: 3144270 (1964-08-01), Bilancia
patent: 4868941 (1989-09-01), Tai
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