DE528905C - Circuit arrangement for call seekers in telephone systems - Google Patents

Description

GERMAN EMPIRE

ISSUED AIH JULY 7, 1931

REICH PATENT OFFICE

PATENT LETTERING

M 528 CLASS 21a ³ GROUP

Siemens & Halske Akt.-Ges., In Berlin-Siemensstadt *)

Circuit arrangement for call seekers in telephone systems

Patented in the German Empire on July 17, 1926

The invention relates to telephone systems with dialer operation and relates to in particular a circuit arrangement for transmitting an incentive to set a free call seeker on a calling line. Is now used for arrangements of this type those when a call is not completed within a certain time, for example in the event of malfunctions of a call viewer provided, another call viewer can occur is provided by a timer, after a call has been completed by a call seeker provided via a time switch, the disturbed If the call seeker is stimulated again when there is a new call, the timer occurs if the fault is still present exists, is back in action and makes another call finder available again.

This AS made available as an alternative is now stimulated again and again in the event of a prolonged fault in one and the same call seeker, so that it experiences a significant overload. This also significantly limits the possibility of traffic in that group of subscribers to whom this call searcher is preferably assigned during normal operation. The arrangement according to the invention now ensures that a better mix of traffic occurs, even in cases in which a disturbed call seeker can be repeatedly stimulated. This is achieved in that if a call is not dealt with by a call seeker stimulated by a switching device, a timer is activated within a certain time, which causes the call stimulus to be passed on to a free AS via a second switching device providing the call seekers in a different order.

Assuming that the subscriber who is connected to lines La ² , Lb ² lifts his receiver, the following circuit is closed: Earth, winding of the relay An ² , contact Tt ² , line La ² , subscriber loop , line ^{Lb 2} , Contact 2 1 ² , winding of relay T ² , battery, earth. In this circuit, the relays An ² · and T ² respond. The relay T ² is designed as a step relay and actuates only the contact 3 1 ² in the circuit just described. The relay ^ Iw ² closes its contact on ² . This creates the following circuit: earth, contact at ² , switch arm ws ^{2 of} the selector seeker PFS ¹ , relay R ² , contact 2 » ² , battery, earth. The relay R ² responds and operates its contacts Jr ² , 2Y ² , 3r ² , 4? ² . Through the contact xr ² , earth is applied to the switching arm c ^{2 of} the call seeker AS «. The contact 2r ² switches the rotary magnet DAS ^{2 of} the call seeker AS ¹¹ into an interrupter circuit. Of the

*) The patent seeker stated as the inventor:

Max Langer in Berlin-Hermsdorf.

Call finder will now start rotating. The starter chain for the other i? Relays is interrupted by the contact 3r ^2. The contact 4r ² closes a circuit for the thermal relay Th ² . With ws ¹ , ws ² and ws ³ three switching arms of the selector seeker WS * are designated. The number of these switching arms depends on the number of caller groups. By closing the contact at ² , a current flow for the relays R ¹ and R via the contacts 3 z ¹ and ^ r ^{3 can also} come about. However, since this runs through the relays' own contacts, it is interrupted at the slightest excitation of these relays, which prevents relays R ¹ and R ^s from becoming effective. If the call seeker assigned to the relay R ^{2 is} busy, the contact 2v is open, as will be described later. In this case the relay 22'ao cannot respond and the stimulus is passed on to another call seeker ^{via contact 3r 2.}

Assuming that the call seeker AS ² that has just been started is disturbed and does not find the marked line after a certain time, the thermal relay Th ² responds and closes a circuit for the rotary magnet of the voter seeker PFS ¹ via its contact th ² . This is set up so that it takes a step when one of the thermal relay ^{contacts th 1} , th ² , th ^z closes (not shown). In our case, the voter WS ^{1 turned} his switching arms one step further when the contract th ^{2 was concluded.} As a result, the starter earth on the switching arm ws ^{2 is connected} to the relay R ¹ . If this call seeker is not busy, the relay R ¹ responds and activates its corresponding contacts. The interrupter circuit for the rotary magnet of the call seeker AS ^{1 is} closed by contact zr ^1. Contact xr ¹ applies earth to the test switch arm c ^{1 of} the request seeker. Contact 3 r ¹ separates the incentive chain and contact 4J- ¹ forms a circuit for the thermal relay Th ¹ . If the call seeker now turns his switching arms step by step over the contacts of his contact banks, when the switching arm c ¹ hits contact 4, the following circuit for the test relay P ^{1 of} the call seeker AS ^{1 is} closed: Earth, contact xr ¹ , winding I and II of relay P ¹ , Switch arm c ¹ , contact 4, connection point d, contact 3 t ² , relay Γ ² , battery, earth. In this circuit, the relay P ¹ responds and, through contact ^{4p 1, separates} the rotary magnet of the call seeker AS * from the breaker.

The call finder stops. Contact 3p ¹

shorts the winding II of the relay P ¹ and thereby prevents, in a known manner, another call seeker from checking the line in use. The contacts 2p ¹ and xp ¹ switch the speech line through. Furthermore, the step relay T ² responds completely in the circuit just described and opens its contacts 2 1 ″ and Ii ^2. The relay An ² drops out. The relays A ¹ and B ¹ are now on the subscriber loop and are excited contact a ¹ is the relay V energized ^1. This puts his contact to xv and holds thereby the relay P ¹ excited when the relay R ¹ opens its contact xr ^1. Further, 2V ¹ battery of the relay R ¹ is separated by contact. Relay R ¹ can therefore no longer be energized by the chain connection or by a voter seeker. When the conversation is over and the subscriber hangs up his receiver on lines La ² , Lb ² , relays A ¹ and B ^{1 drop} . the relay A ¹ operates its contact a ¹ and opens thereby the circuit for the relay F ^1. This is de-energized and turned on by its contact xv ^1, the earth of the relay P ab. the contact 3p ¹ overrides the short-circuit of the winding II of Rel ais P ¹ on, contact 4p ¹ prepares the circuit for the rotary magnet of the call seeker AS ¹ , contacts 2p ¹ and Xp ¹ open the voice connection. The contact 2V ¹ has been closed and applies the battery to the relay R ¹ again. Furthermore, the relay T ^{2 was} de-energized, which actuated its contacts. By contact Ii ² relay An ² to the subscriber line La is? switched on and through contact 2i ² relay T ² to line Lb ² . Contact 3 1 ² switches off relay T ² from connection point d . The call finder JS ¹ is now accessible to traffic again. The invention is not restricted to the exemplary embodiment.

Claims (8)

Patent claims: i. Circuit arrangement for call seekers in telephone systems, in which case of failure of a call within a certain time the call stimulus through a time switch to another call seeker is passed on, characterized in that if a Call by a call seeker stimulated via a switching device (ring line) within a certain time, a time switch is effective, which causes the call stimulus via a second switching device providing the call seekers in a different order (voter seekers) passed on to a free call finder will. 2. Circuit arrangement according to claim 1, characterized in that for both Switching devices a common starting circuit is provided. 3. Circuit arrangement according to claim 2, characterized in that the starting circuit runs via series switching means (Ws ¹ , 3 ^ ¹ ) of both switching devices. 4. Circuit arrangement according to claim 1, characterized in that as switching devices a ring line and a voter seeker are provided and the voter seeker under the influence of a timer stands. 5. Circuit arrangement according to claim 1, characterized in that the malfunctions effective switching device (voter seeker) from the individual call seekers assigned time switches (e.g. thermal relay) is controlled. 6. Circuit arrangement according to claim 1 for systems in which the call seekers The connecting lines to be operated are divided into several groups, characterized in that each of the switching devices is provided with an access for each line group for the transmission of the call incentive. 7. Circuit arrangement according to claim 1 for systems in which the of a number Caller to use connection 3 η lines divided into several groups are, characterized in that a voter seeker jointly for several line groups is provided, which has at least one switching means (z. B. switching arm) for each line group. 8. Circuit arrangement according to claim 7, characterized in that one and the same occupancy devices (A ¹ , R ² ) of the individual call seekers through the various switching means of the voter seeker JlS ² ) can be mastered. 1 sheet of drawings