Beds – Bedclothing – And means to facilitate changing thereof
Patent
1991-02-14
1992-04-28
Grosz, Alexander
Beds
Bedclothing
And means to facilitate changing thereof
5458, 5455, A47C 2710
Patent
active
051075571
ABSTRACT:
A waterbed mattress includes a vinyl watertight water bladder covered by an inflatable air cushion. In one embodiment, the top of the bladder forms the bottom surface of the air cushion, although the bottom surface of the air cushion may also be a separate sheet of vinyl. In either event, the air cushion is composed of two layers of vinyl, sealed around the edges. These layers are also sealed together at a number of locations inside the periphery of the air cushion and the air cushion is partially inflated to give the top of the mattress a soft, pillowy appearance. The air cushion layers are optionally sealed together to form separate zones which may be inflated varying amounts. Although it is preferred that the zones be inflated with air, some of the zones can be filled with water instead. The seals in the air cushion define numerous paths for air to flow under the user. When inflated a sufficient amount, the air cushion provides an insulating layer between the bladder of the waterbed mattress and the user. In addition to the air cushion, the mattress may further include an inflatable air bladder, either inside the vinyl bladder of the waterbed mattress or between the air cushion and the vinyl bladder, to provide additional support in predetermined areas, such as the lumbar area. An inflation valve for the watertight bladder passes through the air cushion and the air cushion is completely sealed circumferentially about the inflation valve.
REFERENCES:
patent: 2604641 (1952-07-01), Reed
patent: 4149541 (1979-04-01), Gammons et al.
patent: 4292701 (1981-10-01), Woychick
patent: 4389742 (1983-06-01), DeWitt
patent: 4724560 (1988-02-01), Christie
patent: 4821354 (1989-04-01), Little
patent: 4901386 (1990-02-01), Lane
patent: 5044030 (1991-09-01), Balaton
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