DE193195C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

.- ■ JV * 193195 CLASS 21 a. GROUP 63 '

and extensions.

Patented in the German Empire on March 10, 1906. Longest duration: August 11, 1920.

The invention, which is a further embodiment of the patent specification 191882 described circuit for telephone systems using the central battery system Main and subsidiary units concerns, in which the line of the microphone feed current as well of the speech streams executed as a loop and completely during speech communication is isolated from earth, consists mainly in the fact that what is on the main body, in the one exchange line, slow-acting relay, which the Temporary grounding of a Ämtsanschlussleitung caused when making a Connection with the office through its anchor initially interrupted in a state of rest Connection of the trunk line to earth closes and immediately interrupts again.

In the drawing, two embodiments of the new circuit are shown.

The office A (Fig., 1) is in one of the im

Main patent described types arranged.

On the main station B is' that for grounding

the office connection line 1 serving relay h ⁵ continuously switched on in the latter between the office jack ρ and the junction, which leads to the plug system ο, η and is set up just as according to the main patent. In parallel with the relay h ^{5 there} is expediently an induction-free resistor r, which prevents it from responding too quickly and at the same time serves to transfer the speech currents. The armature h ⁶ acts on two contact springs h ¹ , h ^& , of which the former is isolated from the grounded contact h ⁹ in the rest position of the armature h ^e and connected to the break contact h ^{10 of} the contact spring h ^a connected to the line 5.

The extensions C, of which only one is shown for the sake of clarity, only have the usual devices. The call to the main station B by the extensions C and the traffic between the latter takes place in the same way as described in the main patent and therefore does not need to be explained again.

If the subscriber C wants to communicate with the office, after the appearance of the call signal k on the main unit B, the plug η is inserted into the jack m , then the interrogator (not shown) is switched on by pressing button j and the plug 0 in the office handle ρ called office A. When plugging the plug 0 into the pawl ρ , current initially flows in the following way: Free

Previous additional patent: 193071.

Claims (2)

Pole from d, b, I, partly via / z5 or r, 5, p, o, partly via the choke coils to η and from there via in, 3, C, 4, m, n, 2, c to the earth's pole from d. As long as the current flow described is present, both windings b, c of the call relay on office A are live, so that the armature e is not attracted and the call lamp is not switched on. After a few moments, however, the relay / j5, which responds slowly, picks up its armature ft6, so that the contact spring h1 touches the grounded contact ft9 and the current from the exchange connection line I via h5 or r, /? A, h10, h7, ft9 immediately returns to earth. The winding c of the call relay at the office is de-energized as a result, the armature e assumes its working position, thereby short-circuiting the winding c and switching on the call lamp f. Again after a few moments the armature he 'lies against the contact spring hs and thereby interrupts the branch of the line 5 leading to earth Bypassing the short-circuited winding c so that the call lamp f still lights up. After the call signal f appears, the assistant at office A establishes the required connection in the known manner. In order to be able to communicate directly with the office A from the 'extension C, which z. B. is required during the night in many cases, the plugs η, ο are inserted into the jacks m, ρ, so that the subscriber C is now able to call office A by simply removing his receiver from the hook switch. The call takes place with the assistance of the relay h6 in the manner just described. The circuit according to FIG. 2 differs from that according to FIG. 1 only in that instead of the one slowly responding relay h5, whose armature acts on two contacts, a slow and one fast acting relay h5 and h11 between the exchange line 1 and the line 5 are switched on in parallel or in series, which in turn are bridged by an induction-free resistor r. The armature of the fast-acting relay h11 is used to earth the line 5, and the armature of the slow-acting relay ft5 is used to interrupt this earth connection. The mode of operation of the two relays / i5, h11 corresponds to that of the one relay h5 in FIG. 1, so that a repetition of the various switching processes is not necessary. Godfather ν τ-An Proverbs: 1. Circuit according to patent 191882 for telephone systems according to the central battery system with main and auxiliary units, characterized in that the slow-acting relay (h ⁵ ) located on the main unit (B ), which causes the temporary grounding of one exchange line (i) , when establishing a connection with the office (A) through its anchor (h ^a ) initially an interrupted connection (h ^s , h ^m , h ¹ , h ^% ) of the exchange line (1) closes with earth and immediately interrupts it again. 2. A circuit according to claim 1, characterized in that in addition to the slow-acting relay (Ir ') there is also a fast-acting relay (h ^li ) in the exchange connection line (1), the armature of the latter (h ⁿ ) initially in the idle state interrupted connection of an exchange line (1) closes with earth, whereupon it is immediately interrupted again by the armature of the slow-acting relay (h ^b ) . 1 sheet of drawings.