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
Application number
Other languages
German (de)
Inventor
Hossdorf Josef
Original Assignee
Hossdorf Josef
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hossdorf Josef filed Critical Hossdorf Josef
Publication of CH174474A publication Critical patent/CH174474A/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/21Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H04M1/2155Acoustic 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)

PATENTANSPRUCH: Einrichtung mit stromlosem Mithörer an Telephonen, gekennzeichnet durch zwei durch eine biegsame Rohrleitung untereinander ver bundene Hörmuscheln, von denen die eine zum Aufsetzen auf die Telephonhördose aus gebildet ist, während die andere den Mithörer bildet. Claim: device with de-energized eavesdropping on telephones, characterized by two earpieces 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 eavesdropper.
CH174474D 1934-05-14 1934-05-14 Device with currentless eavesdropping on telephones. CH174474A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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