DE242831C

DE242831C -

Info

Publication number: DE242831C
Application number: DENDAT242831D
Authority: DE
Also published as: DE247911C; DE245897C; DE247152C; DE249192C; DE247910C; DE247914C; DE254248C

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

- M 242831 KLASSE 21 a. GRUPPE- M 242831 CLASS 21 a. GROUP

Patentiert im Deutschen Reiche vom 21. Oktober 1909 ab.Patented in the German Empire on October 21, 1909.

Bei der Herstellung der feinen Hitzleiter für thermische Telephone, welche gewöhnlich aus nach dem Wollastone-Verfahren behandelten Platindrähten bestehen, bei welchem- Verfahren bekanntlich der mit einer Silberumhüllung versehene äußerst feine Platinleiter durch Eintauchen in Salpetersäure usw. von dieser Umhüllung in . dem notwendigen Maße befreit werden kann, existieren noch heute trotz An- ·In the manufacture of fine heat conductors for thermal telephones, which are usually consist of platinum wires treated according to the Wollastone process, in which process as is well known, the extremely fine platinum conductor provided with a silver coating by immersion in nitric acid etc. from this wrapping in. exempted to the necessary extent still exist today despite the

ίο wendung des Wollastone-Verfahrens solche Schwierigkeiten, daß eine fabrikmäßige Herstellung der thermischen Telephone nicht möglich war und demzufolge solche Telephone trotz ihrer Überlegenheit gegen elektromagnetische Telephone infolge zu hohen Preises nicht eingeführt werden können.ίο use of the Wollastone process such Difficulties that factory production of the thermal telephones is not possible and consequently such telephones in spite of their superiority over electromagnetic ones Telephones cannot be introduced due to their high price.

Die vorliegende Erfindung veranlaßt bei der Herstellung der Hitzeleiter für thermische Telephone eine wesentliche Vereinfachung, dergestalt, daß auch der Dufchschnittsarbeiter mit Leichtigkeit trotz der hier in Frage kommenden Feinheit des Hitzeleiters gleichmäßige Produkte schaffen und demzufolge bei thermischen Telephonen dieser Art eine fabrikmäßige Herstellung Platz greifen kann.The present invention causes thermal conductors in the manufacture of the heat conductors Telephone an essential simplification, so that the average worker with ease despite the fineness of the heat conductor in question Create products and consequently factory-made thermal telephones of this type Manufacturing space can take hold.

Die vorliegende Erfindung kennzeichnet sich durch Anwendung eines Umgusses, welcher in einer Form aus säurefestem und stromisolierendem Material auf einein entsprechend gestalteten Wollastöne'-Draht erzeugt wird, derart, daß er die Enden dieses Drahtes vereinigt und¹ letzterer nur insoweit aus dem blockartigen Umguß ,hervorsteht, als er dem Ätzprozeß unterworfen und später als Hitzeleiter verwendet werden soll. Gleichzeitig wird hierbei dem Urriguß solche Form gegeben, daß dieser nach Beendigung des Ätzverfahrens als endgültige Fassung für den Hitzeleiter im Telephonapparat selbst benutzt werden kann. Dieser Umstand, der wieder eine wesentliche Vereinfachung in der Behandlungsweise des äußerst diffizilen Hitzeleiters bedeutet, hat aber noch insofern einen besonderen Vorteil, als damit eine sehr einfache Auswechselbarkeit des Hitzeleiters im Telephon gegeben ist, derart, daß '· der Hitzeleiter im Falle einer eventuellen Zerstörung im Telephon jederzeit mit größer Leichtigkeit und Schnelligkeit ausgewechselt .werden kann.The present invention is characterized by use of an overmold, which is generated in a form of acid-resistant and stromisolierendem material Einein correspondingly shaped Wollastöne' wire, such that it joins the ends of this wire and ¹ the latter only so far from the block-like surrounding casting, projecting when it is to be subjected to the etching process and later to be used as a heat conductor. At the same time, the original cast is given such a shape that, after the etching process has been completed, it can be used as the final version for the heat conductor in the telephone set itself. This circumstance, which again means a substantial simplification in the way the extremely difficult heat conductor is treated, has a particular advantage in that it makes it very easy to replace the heat conductor in the telephone, so that the heat conductor in the event of any destruction can be exchanged on the telephone at any time with greater ease and speed.

Die Ausführung des- Verfahrens vollzieht >sich in folgender Weise:The procedure is carried out in the following way:

Durch meinen Stempel oder durch sonstige geeignete Mittel wird z. B. aus, Wollastone-Draht der,aus Fig. 1 ersichtliche, im wesentlichen IT-förmige Drahtkörper 1 gebildet, der einen Bogen 2 enth'ält, während die Schenkel einfache, oder mehrfache nasenartige Vorsprünge 3 besitzen. , Dieser Drahtkö.rper wird in eine Gießform 4 eingesetzt, die einen entsprechend gestalteten Hohlraum enthält, wobei der JDrahtbogen 2 in einer im Boden der Form angeordneten besonderen Ausnehmung ruht. Die Form 4 wird durch einen Deckel 4" abgeschlossen, der einen Einguß 4* besitzt, während in der Mitte zweckmäßig zwei kleine Öffnungen vorhanden sind, durch welche die Enden des Drahtes nach außen gezogen werden. Der untere Teil der Form besitzt Windlöcher 4^C zur Ableitung der verdrängten Luft. In die Form wird eine geeigneteBy my stamp or by other suitable means z. B. formed from Wollastone wire, the, from FIG. 1, essentially IT-shaped wire body 1, which contains an arch 2, while the legs have single or multiple nose-like projections 3. This wire body is inserted into a casting mold 4 which contains a correspondingly shaped cavity, the wire arch 2 resting in a special recess arranged in the bottom of the mold. The mold 4 is closed by a cover 4 'which has a sprue 4 *, while present in the middle expedient two small openings through which the ends of the wire are pulled outwards. The lower part of the mold has wind holes 4 ^C for Discharge of the displaced air. A suitable shape is created in the mold

(2. Auflage, aufgegeben am 9. Juli !§13.) (2nd edition, posted on July 9th ! §13.)

Claims

Mass 5 poured in, pressed in or otherwise; as conveyed in, in such a way that this encapsulation envelops and unites the wire legs including the corrugations, but leaves free the arch 2 resting in the recess and the wire ends leading to the outside. The mass mentioned must of course have acid resistance and isolate the current. Now the wire body 1 provided with the encapsulation 5 to is removed from the mold, having the shape shown in FIG only provide the wire ends. The arch wire 2 protruding from the casting is now subjected to the etching process customary in the Wollastone process or also to an electrolytic process and the inner platinum core of the wire is thereby freed from its sheathing, so that the actual heat conductor 6 (FIG. 3) now results. It can be seen from the above that it is extremely easy in the production method described to free the platinum core from its sheathing and, even if the production of such heating elements in large quantities is possible, these can always be given the same length, since it during the etching process it is no longer necessary to limit the immersion in the acid only to the wire part to be freed from the sheathing; only the wire arch protruding from the block, by which the length of the heat conductor is determined each time, can be attacked by the acid, even if the block is immersed a little deeper in the acid. The block-like body created in the manner described, from which only the barely visible heat conductor protrudes after the etching process, also serves as a support for the latter, which has the advantage that the heat conductor also has the shape it received before the etching process Maintains security. The heat conductor with its block encapsulation can therefore be handled in any desired manner without any damage, destruction or bending of the conductor could occur despite the fineness of the heat conductor. The same block-like encapsulation is also suitable as a holder for the heat conductor within the telephone set; For this purpose, the block 5 with the protruding heat conductor 6 is inserted into a housing-like body 7 (FIG. 4) which has a recess 8 corresponding to the encapsulation 5, which in the example chosen has a cylindrical shape. The attachment 9 is screwed onto the housing-like body 7, so that the sound chamber 10 in this housing surrounds the heat conductor 6 tightly. In this way, below the block-like body 5, not only one heat conductor, but also several of the same can be arranged, processed and inserted into the telephony housing in the above manner, if it is a question of creating greater performance in terms of sound reproduction. Despite the otherwise extremely difficult processing of such fine wires, the fact that, according to the present invention, the wire to be processed according to the Wollastone method is given a casting uniting the wire ends after shaping and this casting is used at the same time as the holder of the heat conductor in the telephone set, any Difficulty overcome, since any touch of the heat conductor with the hand or with the tools is unnecessary, the whole production requires only such simple manipulations that on the one hand perfectly uniform products are created, on the other hand also the average worker all here in Question can easily perform upcoming work. Godfather ν τ-Α ν Proverbs:

1. Process for the production of Hitzprganen for thermal telephones from after Platinum wires treated with the Wollast one process, characterized in that the Wollastone wire after shaping with one that unites the ends of the wire Umguß is provided, from which protrudes only the wire part to be subjected to the known etching process.

2. The method according to claim 1, characterized in that the casting for the Heat conductor is given a block-like shape, so that the casting at the same time as Socket of the heat conductor in the telephone set can be used.

1 sheet of drawings.