Constant-pressure waterbed structure

Beds – Waterbed or associated device – With frame means supporting or surrounding a removable bladder

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Details

5672, A47C27/10

Patent

active

059013923

ABSTRACT:
A constant-pressure waterbed is provided, which can provide a constant air pressure to a sole air-pressure frame that surrounds a water-filled mattress so as to allow the water in the water-filled mattress to be always suitably compressed to provide the desired level of softness. The air-pressure frame is used to apply an air pressure of a preselected limit level to the water-filled mattress. The constant-pressure waterbed utilizes a drainage valve to drain excessive air in the event that the air pressure in the air-pressure frame is above a preselected limit level so as to maintain the air pressure at the preselected limit level. Moreover, the constant-pressure waterbed utilizes an air pump which can pump air into the air-pressure frame when the air pressure in the air-pressure frame is below the preselected limit level. The air pressure in the air-pressure frame can therefore always be maintained at the desired level so as to allow the water-filled mattress to always provide the desired level of softness.

REFERENCES:
patent: 4100635 (1978-07-01), Mitchell et al.
patent: 4169295 (1979-10-01), Darling
patent: 4634179 (1987-01-01), Hashimoto
patent: 4644597 (1987-02-01), Walker
patent: 4663790 (1987-05-01), Santo
patent: 4679264 (1987-07-01), Mollura
patent: 4694520 (1987-09-01), Paul et al.
patent: 4797962 (1989-01-01), Goode
patent: 5020176 (1991-06-01), Dotson

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