Dispensing – Automatic control – Delivery from source controlled by quantity in discharging...
Patent
1974-02-04
1976-02-03
Reeves, Robert B.
Dispensing
Automatic control
Delivery from source controlled by quantity in discharging...
222 64, 340244C, 340246, B67D 508
Patent
active
039359700
ABSTRACT:
A single length of insulated, stranded steel cable extends vertically through a bin or other material container and functions as a radiating antenna for an electrical signal transmitter. The reactance of the antenna, which varies as a function of the level of material in the container adjacent the antenna, is inductively linked to an oscillator circuit in the transmitter. The transmitter's signal which is altered in frequency with changes in the antenna's reactance is combined with that of a constant frequency reference signal. The frequency of the resulting difference signal is employed to form a remote indication of the material level and to provide control information for automatically maintaining or varying material levels.
REFERENCES:
patent: 2381505 (1945-08-01), Lindholm
patent: 2621517 (1952-12-01), Sontheimer
patent: 2674396 (1954-04-01), Peterson
patent: 2774959 (1956-12-01), Edelman
patent: 2955466 (1960-10-01), Coles
patent: 3036736 (1962-05-01), Murphy
patent: 3140608 (1964-07-01), Clark
patent: 3277711 (1966-10-01), Roberge
patent: 3404963 (1968-10-01), Fritsche
Reeves Robert B.
Scherbel David A.
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