CH174474A - Device with currentless eavesdropping on telephones. - Google Patents
Device with currentless eavesdropping on telephones.Info
- Publication number
- CH174474A CH174474A CH174474DA CH174474A CH 174474 A CH174474 A CH 174474A CH 174474D A CH174474D A CH 174474DA CH 174474 A CH174474 A CH 174474A
- Authority
- CH
- Switzerland
- Prior art keywords
- telephones
- eavesdropping
- currentless
- flexible pipe
- hearing
- Prior art date
Links
- 239000002184 metal Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
- H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
- H04M1/2155—Acoustic coupling
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Description
Einrichtung mit stromlosem Mithör er an Telephonen. Gegenstand der vorliegenden Erfindung ist eine Einrichtung mit einem stromlosen Mithörer an Telephonen, welche sieh kenn- zeichnet durch zwei durch eine biegsame Rohrleitung untereinander verbundene Hör muscheln, von denen die eine zum Aufsetzen auf die Telephonhördose ausgebildet ist, wäh rend die andere den eigentlichen Mithörer bildet.
Die Zeichnung veranschaulicht ein Aus führungsbeispiel des Erfindungsgegenstandes. Fig. 1 ist ein Längsschnitt, und Fig. 2 eine Oberansicht desselben.
A ist ein Telephonsprech- und -hörrohr bekannter Ausführung mit der Hördose a. B und C sind zwei durch eine biegsame Rohrleitung c untereinander verbundene Hör muscheln, voll denen jene B mittelst _ eines Steckanschlusses b auf die Telephonhördose a aufsteckbar ist, während die andere C als eigentlicher Mithörer dient.
Durch zweckmässige Ausführung kann erreicht werden, dass man an der Mithörer- muschel C so deutlich hört wie an der Haupthörmuschel B. Scharfe Kanten sind an den Leitungsanschlüssen möglichst zu vermeiden, um eine unbehinderte Fortpflan zung der Schallwellen zu erzielen. Die eigent liche Mithörermuschel C ist bis auf das Hör loch und die Leitungsanschlussöffnung ge schlossen.
Die Hörmuscheln B und C können aus Metall, Hart- oder Weichgummi oder sonst einem geeigneten Material bestehen. Die biegsame Rohrleitung c kann aus einem Gummischlauch oder aber aus einem Metall- spiralschlauch bestehen, der innen mit ein wandfrei glattem Stoff oder einer Gummi einlage durchzogen ist.
Device with currentless eavesdropping on telephones. The present invention relates to a device with a currentless listener on telephones, which is characterized by two hearing shells connected to one another by a flexible pipe, one of which is designed to be placed on the telephone socket, while the other forms the actual listener .
The drawing illustrates an exemplary embodiment of the subject matter of the invention. Fig. 1 is a longitudinal section, and Fig. 2 is a top view of the same.
A is a telephone speaker and ear tube of known design with the hearing socket a. B and C are two hearing shells connected to one another by a flexible pipe c, full of which that B can be plugged onto the telephone socket a by means of a plug connection b, while the other C serves as the actual listener.
With a practical design it can be achieved that you can hear as clearly on the listening earcup C as on the main earcup B. Sharp edges should be avoided at the line connections in order to achieve an unhindered propagation of the sound waves. The actual listening clam C is closed except for the listening hole and the line connection opening.
The earpieces B and C can consist of metal, hard or soft rubber or some other suitable material. The flexible pipe c can consist of a rubber hose or a metal spiral hose, which is traversed inside with a smooth fabric or a rubber insert.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH174474T | 1934-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH174474A true CH174474A (en) | 1935-01-15 |
Family
ID=4425469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH174474D CH174474A (en) | 1934-05-14 | 1934-05-14 | Device with currentless eavesdropping on telephones. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH174474A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2620891A (en) * | 1951-02-12 | 1952-12-09 | Roger A B Heap | Telephone receiving device for two listeners |
-
1934
- 1934-05-14 CH CH174474D patent/CH174474A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2620891A (en) * | 1951-02-12 | 1952-12-09 | Roger A B Heap | Telephone receiving device for two listeners |
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