DE176439C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVr 176439 - CLASS 21 h. GROUP

Company W. C. HERAEUS in HANAU a. M.

Patented in the German Empire on August 10, 1905.

In order to achieve an even load on the resistance material and thereby a greater durability of the electric ovens, care must be taken that the resistor is connected to the radiator as well as possible. However, this makes difficulties particularly with small radiators, in which wire has to be used in view of the usual voltages. In many cases one proceeds ¹

ίο in such a way that you can cut the wire with the help of the Lathe on a pipe made of porcelain or chamotte or other refractory material ■ wraps or lays in a groove in the heating pipe. It then becomes a paste painted on and the whole thing covered with glaze. Another method is used the wire wound in the form of a spiral; this spiral is inserted into a tube and coated the whole thing with the paste.

Both methods have the big disadvantage in common that the paste usually burns shrinks more than the pipe, which causes cracks and is imperfect connects the pipe and the resistance material. The second method is only for very strong wire possible, but its use especially with platinum because of the high Price is excluded. These methods are unsuitable for covering panels, Muffles and boxes if the rear wall is to be wrapped in the latter. Another one known procedure is the following:

The wire is wound on a core in the form of a spiral and this with a Spread the paste. After the latter has hardened, the core is removed and that too The muffle still covered with insulating material was fired on the inside. Also this from · the American Patent 688170 known method is only possible with very strong wire and can also do not apply to all types of radiators.

The method which forms the subject of the present invention permits on easy way and using wire as thin as you wish, the production is almost possible Any shape of furnace, muffle, bowl or plate.

The procedure consists of the following:
An organic fabric, net or knitted stocking is stretched or sewn on smoothly around a shape made of wood, metal or the like, which has any shape and corresponds to the interior of the radiator. The wire or thin ribbon is sewn onto this in the form of spirals or in a zigzag with thread. In the case of larger bodies, it is advisable to use wire mesh instead of wire. The heat-resistant insulating compound, which can consist of clay, porcelain, fireclay and similar compounds, is then pressed, molded or poured around the wrapping produced in this way. After the mass has hardened by drying, the mold can be removed. The mesh with the wire spiral remains attached to the mass, while the wire itself is embedded. The organic tissue can now through

weak heating to be burned. The surface created inside can then nor · may be coated with glaze. Eventually the whole thing will fired at high temperature.

Claims (1)

-Patent Claim: Process for the production of electrically heated ovens, plates and the like. ίο with a heating resistor embedded in the mass of the radiator, characterized in that that a combustible, z. B. stretched organic tissue is to which the heating resistor in the form of wire, thin sheet metal strips, wire mesh or the like. In spiral or Zigzag shape is sewn, and that after the heat-resistant insulating material in a known manner around the shape wound in this way Formed, poured or pressed on and the core removed after the mass has hardened, the organic Tissue is burned off, whereupon the inner surface is smooth in the usual way painted, possibly covered with glaze and the whole thing can be fired at a high temperature. berlin, printed in the Reichsdruckerei.