DE75393C - Method and device for the production of paraffin forms - Google Patents

Description

IMPERIAL

PATENT OFFICE. \ i

PATENT LETTERING

CLASS 31: Foundry and molding.

Patented in the German Empire on July 11, 1893.

The present invention relates to a method, including sensitive ones Objects forms can be manufactured, and on an apparatus which is advantageous this procedure is used. The molds made by this process are Can be used for all purposes when cold liquids are used to make the casts, e.g. B. Gyps, are used.

The essence of the process is that a spray of molten Paraffin spreads over the object from which a shape is to be taken will. The apparatus used for this is shown in the accompanying drawing shows

Fig. Ι the general arrangement of the same,

2 shows, on an enlarged scale, a section through the paraffin atomizer,

3 shows, on an enlarged scale, a section through the water atomizer.

A container B filled with paraffin is hung in a container Ά, which is filled with water, which must be hot enough to be able to keep paraffin constantly in a liquid state. Each of these two containers A and B is provided with an outlet pipe, namely the container B is arranged so that the two outlet pipes face each other.

From the outlet tube of the container A a flexible tube C leads to the outer tube of an atomizer D and from the outlet tube of the container B a smaller tube E passed through the tube C leads to the inner tube of this atomizer. In this way the pipe E, through which the paraffin emerges, is constantly surrounded by a jacket of hot water, so that the paraffin is kept liquid on its way to the atomizer. The hot water fed to the atomizer can exit through a pipe N which is provided with a regulating valve.

The container F provided with an airtight valve is supplied with air under pressure by an air pump G or other device. From this container F a flexible tube H leads to a tube O of the atomizer, from which the air is expelled in a jet through the central opening of the tip /. The tip I is connected to the atomizer in an adjustable manner, so that the quantity of paraffin that emerges can be regulated or completely interrupted. This adjustment is brought about by the fact that the distance between the tip / and the pipe end O is increased or decreased.

The apparatus is used as follows:
The container A is raised so that the paraffin and the water flow towards the atomizer D due to their weight. A moderate pressure is generated in the container F by means of the air pump G, which causes a flow of air to be forced through the tube O and through the tip /. When the tip I is opened, the paraffin, which has a melting point of about 60 to 70 °, emerges from the tube E , meets with the air stream and is so dispersed by it that it enters

Drizzle arises, depending on the amount of paraffin escaping and the force with which which the air is driven out is more or less fine.

The tip / is now directed towards the object from which a mold is to be taken and the paraffin is sprayed onto the cool surface, where it immediately solidifies. In this way the body in question is covered with a complete and even layer of paraffin, the paraffin being laid over even the smallest parts of the surface. After a sufficiently thick layer (about 10 cm) has been applied, an atomizer J is used, which is connected to a cold water tank L through a flexible pipe K and to the air tank F through a pipe M.

If the jet of water is mixed with the jet of paraffin, then not only does the solidification occur And strength of the paraffin favors, but also the water globules Enclosed in cells or capsules of the hardening paraffin, causing the build-up the shape is accelerated.

If the object is provided with a sufficiently thick layer, it becomes a layer Gyps applied, which strengthens the shape and prevents it from throwing and falling apart.

As the Gyps settles, silk threads that are initially over the object have been laid, drawn through the form, so that it is divided into several parts is divided and can be easily removed from the object. After this these parts have been put back together and the joints have been passed is the form done.

Before the paraffin is splashed over the object, the same is done with oil or soap rubbed in so that the form can be easily removed later.

It is true that it is most beneficial to use the paraffin in the form of a spray on the object to guide, but you can also simply spray the paraffin onto the object in a fine jet let down.

Claims (4)

Patent Claims: 1. Process for the production of molds, consisting in the fact that the object, from which the mold is to be taken, a drizzle of liquid paraffin is directed, which on contact with the surface of the object immediately stiffens. 2. The claim ι. marked procedures, provided the paraffin jet is a jet "Cold water is added, which promotes the solidification of the paraffin and in that the water globules are enclosed in cells of the hardening paraffin the build-up of the form is accelerated. 3. To carry out the method characterized in claim 1, a device characterized by an atomizer D, which by a tube C with a raised container A with hot water, and by a tube E arranged inside the tube C with a in the container A suspended container B with liquid paraffin is in connection, in connection with a pipe H, which leads from a container F filled with compressed air to the atomizer. 4. To carry out the method characterized in claim 2, a device consisting of the apparatus characterized in claim 3 in connection with an atomizer J, which is connected through a pipe M to the compressed air tank F and through a pipe K to a cold water tank L in connection stands. 1 sheet of drawings.