Measuring and testing – Specific gravity or density of liquid or solid – With weighing feature
Patent
1998-08-12
2000-08-15
Noland, Thomas P.
Measuring and testing
Specific gravity or density of liquid or solid
With weighing feature
G01N 908
Patent
active
061018740
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to the accurate measurement, without destruction, of metal components. More specifically, the present invention relates to a method for measuring the ratio of gold in cast cold, or the ratio of other components in a cast material.
2. Description of the Related Art
The gold ratio in cast gold is measured in "carats." The carat is the proportionate weight of one twenty-fourth of the weight of the given body, such as tie ratio of pure gold compared with the alloys. Pure gold has a ratio of 24 carats, that is to say, one hundred percent gold. Workshops and producers of jewelry perform the casting of gold with various alloys. The casting is performed in permanent ratios of alloy to gold and in different types of alloys. "Types" of gold are separated from each other in accordance with the type and/or quantity of alloys in the cast. Casting always causes a change in the ratio of gold found in the cast. Therefore it is necessary to measure the ratio of gold in the cast performed, in carats. The performer of the cast requests to measure the ratio of gold that will be received after the casting.
Today, the known way in which thc manufacturers of jewelry measure the ratio of gold in cast gold in the jewelry they produce, is to take a sample of each cast they performed in the workshop to an assayer, who performs a test of the ratio of gold in the sample in order to break down and separate the various components of the sample for the purpose of calculating the ratio of gold within it. This process is expensive, troublesome, long and cannot always be performed in-house. The present invention makes an immediate test possible, at the location of the production.
SUMMARY OF THE INVENTION
The present invention is a method for measuring, without destruction, of the ratio of gold in cast gold or of the ratio of material in the cast in another cast, and a device which performs the measurement using this method.
One of the stages in the method according to the present invention is, the measurement of the specific weight of the cast through the method of submersion in liquid, however, in a special way. In the accepted manner of this method, the body being measured is first weighed in the air and afterwards weighed submerged in liquid when the specific weight of the liquid is known. From the difference between the weights, the specific weight is calculated, which is: body weight divided by the decrease of body weight after submersion in liquid multiplied by the specific weight of the liquid.
Since the bodies referred to herein are primarily very small, principally jewelry, inaccuracies in measurement are caused by problems of surface tension between the liquid and the body and in principal by the creation of air bubbles attached to the measured body at the time it is submerged in liquid. The present invention method is the "Repeated Flooding" method is used--for improving the accuracy of measuring the specific weight of the cast body. For the purpose of deduction the air bubbles and the good joining between the liquid and the body, the body is not merely submerged in the liquid. Rather, the body is placed in a tank and flooded with liquid. Afterwards, the tank is emptied and flooded again. After a number of repetitions of this process, the measured body remains submerged in the liquid without air bubbles and without the spaces created by problems of surface tension. That is to say, "Repeated Flooding," instead of mere submersion. The mathematical equation is identical in the two methods.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described by FIGS. 1 and 2. These figures do not intend in any way to limit the scope of the invention and are intend solely for clarifying description.
FIG. 1 describes an example structure of cast gold with porosity traps which is used in the method.
FIG. 2 describes the device for measuring the ratio of gold using the method of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The
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patent: 4262201 (1981-04-01), Wallisch
patent: 4372405 (1983-02-01), Stuart
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