Water mattress for a therapy water bed

Details Water mattress for a therapy water bed Water mattress for a therapy water bed

1990-12-06

1991-11-19

Grosz, Alexander

Beds

Bedclothing

And means to facilitate changing thereof

5451, 5455, 5464, A47C 2710

Patent

active

050654659

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an arrangement in a water mattress for a water bed, especially for a therapy water bed.
A well-known problem in connection with water beds, and therapy water beds is the large volume of water required to achieve sufficient depth of water, so that the user will not bump on the bottom of the bed when lying in a lateral position or sitting up.
Various attempts have been made to solve this problem, e.g. by shaping a firm bottom to be most shallow in areas where the user's body will not sink down in the bed, e.g. at the foot end of a therapy water bed or for a water mattress to be used in ordinary beds. In connection with use of water mattress bags it is also known to raise the flexible bottom of the bag by inflating air hoses located between the firm support and the bottom of the water bag, or to shape the firm bottom by providing bags which are filled with plastic spheres on said bottom before the water bag is placed on top and is filled with water. If such a bed is to be used by different persons with differing body weight, it has to be adapted to the weight of individual users. This is the case, especially when such water beds are used in hospitals, where a series of different persons will use the water bed/beds and where the weight of such a water bed is of importance in case of transport into and out of wards and to and from therapy posts. In such circumstances it is rather important to be able to provide a water bed in which the volume of water can always be adjusted to a minimum depending on the user's body weight.
In order to insert bags of plastic spheres to shape the firm bottom, the water mattress bag proper must be readily accessible from outside, and water must be discharged. Shaping of the water mattress bag bottom by inflating balloons or hoses under said bottom of the water mattress bag requires high air pressure, and shaping the bottom beyond a shape given in advance wil be difficult because air balloons/hoses must be produced from reinforced plastic or rubber. Flexibility is thus reduced and so is the possibility of individual shaping of the bottom to achieve maximum weight reduction. Additionally, the bottom of the water bed will become stationary because of the high pressure required below the bottom of the water bag to raise the latter with its water content and to support the user.
To be able to shape such a bottom of a water bed according to requirements, e.g. by making it deeper in the central area when the user is to sit up, and more shallow below the area of the user's back to reduce the volume of water, e.g. air must be pumped out of said central area of the user's buttocks to the area of the water bed where the user's back is placed. This requires division of the inflatable hoses/balloons into groups, i.e. a central, an upper, and if desired, a lower section in the water bed. This, furthermore, reqires a carefuly controlled operation to maintain a constant volume of water to avoid adjustment of the volume of water, and an air pump will be necessary all the time to pump air between ballons of the different sections.
It is an object of the present invention to provide an arrangement in a water mattress for a water bed, especially for a therapy water bed, as mentioned above, where the above disadvantages are eliminated.
According to the present invention a water mattress of the kind mentioned above is, thus, achieved, where the bottom of the water bag is double with an intermediate air chamber which is connected with a hose for air supply. In the top face of the air chamber air pockets are provided, made from an air/water tight flexible material and projecting upwards and opening towards the air chamber. When air is supplied to said chamber the chamber and the air pockets will be filled and will partly fill the space of the water mattress inside the water bag, thus, partly to replace the necessary volume of water by a volume of air. Water in the water bag will then be located above the air chamber, in the bottom of the water bag, and between projecting

REFERENCES:
patent: 3605145 (1971-09-01), Graebe
patent: 4109333 (1978-08-01), Zmiarovich
patent: 4558476 (1985-12-01), Linder
patent: 4698864 (1987-10-01), Graebe
patent: 4727607 (1988-03-01), Nystad
patent: 4901386 (1990-02-01), Lane

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