Dispensing – Automatic control – Constant weight – volume or pressure control by output
Reexamination Certificate
1999-11-05
2001-07-03
Derakshani, Philippe (Department: 3754)
Dispensing
Automatic control
Constant weight, volume or pressure control by output
C222S056000, C222S413000
Reexamination Certificate
active
06253959
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a system for measuring and dispensing solid dry flowable materials. More particularly, the present invention relates to apparatus for measuring and dispensing solid dry flowable agricultural products.
BACKGROUND OF THE INVENTION
Apparatus and devices for handling granular chemicals have been developed for a variety of purposes. U.S. Pat. No. 5,029,624 discloses a closed granular chemical handling system comprising a dispensing valve and a receiving valve that are configured to operate in a desired sequence. U.S. Pat. No. 4,054,784 discloses a weigh feeder system including a device for controllably discharging a substance from a container and apparatus for weighing the container. WO95/10363 pertains to a metering device for dry direct injection into a spray tank. Dosieren zur Prozen&bgr;automatisierung—Systematik, Materialflu&bgr;, Dosiergenauigkeit, by G. Vetter, Wägen und Dosieren, vol. 23, no. 1, (1992) discloses dosing applications and various dosing methods. There exists a need for a portable apparatus to accurately measure and dispense solid flowable materials such as dry flowable (DF) materials especially in agriculture where hand held measuring devices are routinely used in field conditions.
SUMMARY OF THE INVENTION
A portable apparatus for measuring and dispensing solid dry flowable materials, comprising:
a hopper for containing material;
a quantitative measuring device having a dispensing outlet;
material inlet means in communication with said hopper and said quantitative measuring device for regulating the flow of material therebetween;
system control means in communication with quantitative measuring device for controlling type of measurement and quantity of material; and
a receptacle in communication with the dispensing outlet of said quantitative measuring device.
The present invention also includes a method of measuring a solid dry flowable material comprising feeding the material into a quantitative measuring device having a screw, rotating the screw a specified number of turns dependent upon material type and quantity of material desired such that material is transported along the length of the screw to a material outlet means while being measured, metered and reduced in particle size, and passing the material through the material outlet means and directly into a receptacle.
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Vetter G. et al., Schuttgutmechanische Auslegung Von Dosierdifferentialwaagen Mit Schneckenaustrag,Wagen Und Dosieren, 24, No. 4, 3-16, Jul. 1, 1993.
Vetter G., Dosieren Zur Prozessautomatisierung-systematik, materialfluss, Dosiergenauigkeit,Wagen Und Dosieren, 23, No. 1, 6-8, Feb. 1, 1992.
Gaultney Lawrence Doka
Gerling Joseph Francis
Bui Thach H.
Derakshani Philippe
E. I. Du Pont de Nemours and Company
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