Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1986-02-03
1987-05-05
Levy, Stewart J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73784, 73701, 73716, G01N 3324, G01N 300, G01L 708
Patent
active
046622136
ABSTRACT:
An improved back-pressured pneumatic pressure cell is provided along with a method of using the same. The device includes at least one sensing cell mounted on a blade for insertion into the soil. The cell includes a perforated outer ring and a perforated central disk separated by a threshold. A resilient membrane covers the outer ring and central disk. A first back-pressure is applied through the perforations of the outer ring to the membrane, while a second back-pressure is applied through the perforations of the central disk to the membrane. The second pressure is slightly less than the first pressure. When the first pressure reaches the soil pressure, the seal between the membrane and the threshold is broken, thereby permitting a momentary reverse flow of pressure through the perforations of the central disk until the first and second pressures equalize, as monitored by a differential pressure gauge. A valve regulates the pressure differential between the first and second pressures. The first pressure, and accordingly the soil pressure, is indicated on a main pressure gauge.
REFERENCES:
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patent: 2957341 (1960-10-01), Menard
patent: 3503254 (1970-03-01), Menard
patent: 3610035 (1971-10-01), Handy
patent: 3690148 (1972-09-01), Snowdon
patent: 4090397 (1978-05-01), Hancock et al.
patent: 4091661 (1978-05-01), Handy
patent: 4517842 (1985-05-01), Twomey et al.
patent: 4524626 (1985-06-01), Pabst et al.
patent: 4543820 (1985-10-01), Handy et al.
Eichner Don W.
Handy Richard L.
Iowa State University & Research Foundation, Inc.
Levy Stewart J.
Noland Tom
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