Weighing scales – Self-positioning – Fluid transmission to pressure gauge
Patent
1990-10-12
1992-03-03
Miller, Jr., George H.
Weighing scales
Self-positioning
Fluid transmission to pressure gauge
177144, 177 1, G01G 504, G01G 1952
Patent
active
050924150
ABSTRACT:
In a method for weighing a patient lying on a bed, an air mattress is put beneath the patient. Then, a flowing air is supplied to or discharged from the air mattress so as to balance the weight of the patient with a pressure of a body of air contained within the air mattress. At this time, the amount of the flowing air is measured together with variation of the pressure of the body of air contained within the air mattress, so that a relationship between the amount of the flowing air and the variation of the pressure of the body of air contained within the air mattress is established. Consequently, the weight of the patient may be calculated on the basis of the relationship between the amount of the flowing air and the variation of the pressure of the body of air contained within the air mattress.
REFERENCES:
patent: 3789873 (1974-02-01), Westwood
patent: 4014398 (1977-03-01), Gresko
patent: 4498550 (1985-02-01), Menon
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