DE1175580B - Safety signaling device in which a number of external detectors are connected to the signaling center via a symmetrically grounded double line that is common to all detectors and has closed current flowing through it - Google Patents

Description

Safety alarm device in which a number of external Detector via a symmetrically grounded common, closed-circuit current flowing through all detectors Double line is connected to the alarm center The invention relates on a. Safety alarm device in which a number of external alarms symmetrically grounded via a closed-circuit current flowing through it, common to all detectors Double line is connected to the alarm center and can be called by any detector the active or voice connection to the desired detector through selective switching means switches through. So far, the various external detectors connected via individual star lines, and then there is neither the need to identify the calling detector nor the one to be called To select detectors using selective switching means, because each detector has its own special connecting line is marked. If, however, there are several detectors If a line is connected, mechanical pulse generators are provided in each of them, and thus the location of the calling party is determined after an automatic dialing process Detector made recognizable for the control center. Self-dialing alarms are on the public Telephone networks connected to the alarm center so that each alarm only has one line required as a participant to the nearest post office and the further connection establishment to the central office as a telephone subscriber as usual in the telephone network. the The individual star lines mentioned first require a lot of connection lines, and the detectors with mechanical pulse generators cannot be selected by the control center still to be called. They are mostly operated by a spring mechanism, which according to every message has to be re-tensioned manually; also need their movable Parts of the maintenance, so that the security of the signaling system is not guaranteed, if re-tensioning is neglected or the system is not regularly serviced. Will public telephone networks with their self-dialing devices for reporting is also used, this means a great expense in terms of apparatus and, moreover, sufficient they meet the high safety regulations usually required for such reporting devices nnot, because the dialing devices of the post office cannot be monitored for quiescent current.

Finally, there is already a circuit arrangement for transmission of messages, especially fire or burglar alarms or the like, via telephone lines, known in particular through company management, with which each reporting office through selective switching means that can be controlled via a magnetic circuit belonging to this reporting point is callable. The unoccupied junction parts (detectors) equipped for an alarm are provided with facilities that can be used in the event of a fire or a burglary automatically give the long, low-frequency ringing signal as an emergency call on the line and then different audible signals to the emergency receiving center Identification of the various messages, e.g. B. fire or burglar alarm transmitted. The selective switching means are thus via these permanently active magnetic circuits controllable, and also the call connection is established through them. In order to there is on the one hand the risk that selective switching means due to the call frequency be erroneously actuated in any junction, and on the other hand These permanently switched on magnetic circuits mean a considerable attenuation for the call connection, so that only a limited number of notifiers without special Effort can be looped into the common connecting line.

The invention is based on the object while avoiding the above Disadvantages of creating a safety alarm system in which a large number of alarms about just one of all detectors. common, quiescent current flowing through double line connected to the reporting center. is and every detector with simple means the Call the central office and use a simple selective call procedure to confirm the effective or Can switch through voice connection to the calling or to be called detector, wherein the selective call procedure is not erroneously triggered by conversations and the active or voice connection not through the switching means for the selective calling procedure may be steamed. This is achieved by that according to the invention each magnetic circuit via which the selective switching means in a detector can be controlled are an even number of the same, in equal parts, the two lines of the double line has associated control windings and that these control windings through with DC controllable switches can be symmetrically looped into the two lines to switch the dial-up connection between the central unit and the individual on or off Detectors for the magnetic circuit can be effectively connected in series or against one another.

The dial-up connection between the detectors and the control center is thereby established switched on and off and via this through one of the usual selective call procedures the active or voice connection to the calling detector is established. Under equals In the context of the invention, windings are to be understood as having the same size and rectified currents e.g. B. the same from the beginning of the winding to the end of the winding Generate large and rectified flows. So while the headquarters are through Direct currents in a suitable direction establish the dial-up connection to the detectors and thereby being able to select one of them, the ones belonging to the common ones are in the rest position Control windings belonging to magnetic circuits are switched against each other by the quiescent current, whereby the dial-up connection becomes ineffective. Any interference from interference the outward and return lines from high-voltage systems, such as trams, traffic signal systems or industrial companies or other interfering influences, so there can be no wrong connection between a detector and the control panel. But it is for the detectors at any time possible to call the control center by interrupting the quiescent current, and moreover this immediately indicates any line interruption. Since continue to manufacture the active or voice connection between a detector and the control center is the dial-up connection can be switched off again, calls made via the line or pressing further call buttons on other detectors does not establish an incorrect connection or cause disruptions in the selective dialing facilities.

In a further embodiment of the invention, the can by direct current controllable switch each two antiparallel connected in each of the two lines Directional conductor and the magnetic circuit a transformer with four identical control windings be, of which each control winding can be connected in series with a directional conductor is that the select alternating current flowing over the two lines is over two effective control windings in each case in the magnetic circuit flow through each other cancel when a direct current controlling the directional conductors in the two lines flows in the opposite direction and these flows add up if two direct currents controlling the directional conductors in the two lines in the same direction flow.

Another embodiment of the invention provides that by direct current controllable switch each two antiparallel connected in each of the two lines Directional conductor and the magnetic circuit a relay or stepping mechanism with four of the same Control windings are each of which control winding with a directional conductor such can be connected in series that the direct currents flowing through the two lines via two effective control windings in the magnetic circuit cancel each other out when there is a direct current controlling the directional conductors in the two lines flows in the opposite direction and these flows add up if two direct currents (selection currents) in the two lines that control the directional conductors flow in the same direction.

It is also advantageous that the switch controllable by direct current One directional bridge and the magnetic circuit connected in each of the two lines are a transformer with two identical control windings, each of which is a control winding so in the measuring diagonal of a directional bridge is switchable that the over the two lines flowing selection alternating currents over the two control windings The fluxes acting in the magnetic circuit cancel each other out when the directional ladder controlling direct current flows in the two lines in opposite directions, and these fluxes add up when two direct currents controlling the directional conductors flow in the same direction.

Two windings are then sufficient, due to the less complex directional ladder for the dial-up connection in its effect on the common magnetic circuit behind or can be switched against each other. Advantageously, each detector can in one the current paths formed by the directional conductor through which the system's quiescent current flows a closed, preferably bistable, in the idle state, in particular by have a message button actuatable switch, and this can after actuation the message button also switches off the corresponding detector in the line Prepare the following detector from the line, with one in each detector further, preferably also bistable switch controllable by the control center can be provided in order to disconnect the detectors following the detector from the line. and two switches operable by direct current of different polarity in the Switch on the line.

This means that every detector can by interrupting the quiescent current of the system Give the alarm to the control center. Alarm to be transmitted by other detectors to the control center can be saved until the first active or voice connection is established is canceled again. The active or voice connection between the control center and a detector can be established by all common selective calling procedures. To do this, become voters in the headquarters and with the individual external detectors arranged, they must be driven together in parallel until they have reached the position assigned to a specific detector. Want the headquarters So if you select a particular voter, you must have the required number of pulses on the line, while in the event of an alarm being triggered by a detector, this will be the result seeks that it gives so long impulses on the line until the calling detector the passing voter stops when it is in the position assigned to the calling detector achieved. The control center then recognizes the number of impulses required or the position of your voter, which detector has given the alarm. Such voters However, consist of very sensitive components and are because of the climatic Influences poorly suited for detectors installed in the open, and in particular are mechanical voters because of the potential tremors in Detectors set up on streets are particularly susceptible to failure. Appropriately can overcome these disadvantages through frequency-dependent switches in the individual detectors avoided by using the line from the control center to the same windings of the common magnetic circuit given control currents of different frequencies Activate the active or telephone connection from the control center to the desired detector. Finally, a selected detector can switch through. After all, in one selected detector through the closed-circuit current of the system an alarm transmitter provided there can be switched on, and it can still be switched on in the selected detector by means of a direct current opposite polarity than that of the quiescent current of the system one provided there Telephone device and any switch provided there can be actuated which switches the detector back to its starting position.

Further details of the invention emerge from one in the drawing embodiment illustrated by its circuit. It shows F i g. 1 the headquarters the safety alarm system, F i g. 2 a detector of this facility and the F i g. 3 to 5 in a schematic representation the different possible in the lines Direct currents.

The headquarters according to FIG. 1 is via the double line 1, 2 with the External detectors provided at different locations can be connected. Like the circuit a detector and the line termination according to FIG. 2 shows, every detector is for this purpose looped into the double line 1, 2, and the ends of the double line 1, 2 are Connected to one another in alternating currents via the capacitor 9 and resistor 43 and are connected to earth via equal resistances 41, 42. In the headquarters or the Supply the DC batteries 3 or 4 provided for the locations of the individual detectors after closing the operating switch 11 and 12, the line 1, 2 and the individual Detector with electricity. The system is shown switched off, and therefore are also the relays normally energized when the system is inactive are shown dropped.

After switching on the system, the quiescent current flowing in line 1 via winding 17 'and in line 2 via winding 17 "brings relay 17. This constantly checks the system for operational readiness and, if there is no quiescent current, either through an alarm a detector or in the event of a line break, the alarm clock 5 via the directional conductor 26 to voltage, the latter only to prevent the alarm clock 5 inadvertently when the direct current flowing in the double line 1, 2 is reversed in order to switch through the active and voice connection between a detector Fig. 3 shows, in simplified form, the direction of the quiescent current, which flows in detail as follows: -f- battery 3, changeover contact 192, relay windings 17 ', 18', transformer windings 48 'to 50', line 1 , Directional conductor 30, transformer winding 51 ', directional conductor 32, normally closed contacts 233, 234 and 222, resistors 41, 42, i normally closed contacts 235 and 223, directional conductor 34, transformer winding 51 ", directional conductor 36, Leitun g 2, transformer windings 50 "to 48", relay windings 18 ", 17", normally closed contact 20 " on switch 11, - battery 3. 1) The closed-circuit current therefore flows through winding 51 'in line 1 via directional conductors 30 and 32 from the beginning to the end and the winding 51 ″ in the line 2 via the directional conductors 34 and 36 from the end to the beginning, each marked by a point. The fluxes caused by the windings 51 'and 51 "cancel each other out in the common magnetic circuit of the transformer 51. Interfering pulses in the line can therefore not influence the detectors.

If a detector wants to call the control center and press button 16 , relay 23 and relay 24 via its contact 232 respond and both relays 23, 24 remain via contacts 231, 241 or 232, 251 even after opening the message button 16 is tightened until further notice. Simultaneously with the relay 24, the rotating beacon 47 of the calling detector, connected in parallel, responds, and the contact 233 interrupts the conduction path for the quiescent current of the system, so that the relay 17 in the control center drops out and the alarm clock 5 gives an alarm. If the supervisor in the control center picks up the handset 10 'of the telephone device, the relay 19 comes, whose contacts 191, 192 also connect the negative pole of the battery 3 to the line 1 and the positive pole of the battery 3 via a thermistor 40 to earth. Like F i g. 4 shows that a direct current flows from earth via line 1 and line 2 to the control center; In line 1 , the current now flows in the opposite direction in the idle state.

The winding 51 'is therefore switched on for the current alternating current via the directional conductors 31, 33 in the opposite direction than before by the quiescent current of the system in the line 1 , namely against the direction of the arrow, while the winding 51 "continues via the directional conductors 34, 36 is looped in line 2, is thus flowed through still by the dialing alternating in direction of the arrow. thus, the two windings 51 ', 51 "operatively connected in series and can by their by $ utungen the common magnetic circuit of the transformer 51 influence. According to FIG. 4 flowing direct currents also bring the relay 18, the windings 18 ', 18 "of which are looped into the line 1 and into the line 2 Contact arm 7 'successively switches on the frequency generators 52 to 54 for different frequencies f 1 to f 3.

These frequencies are passed through the windings 48 "'to 50"' of the transformers 48 to 50 one after the other on the double line 1, 2 and control corresponding frequency-dependent switching means in the individual detectors. The frequency f 1 brings in the in FIG. 2 detector shown via the effective because of the currently existing dial-up connection transmitter 51, the relay 21 tuned to the frequency f 1 and via the contact 211, the relay 22, which remains on the contacts 221, 231 until further notice. The changeover contacts 222, 223 interrupt the direct current in the double line 1, 2 after the relay 23 had already opened its contacts 234, 235 by pressing the message button 161. The relay 18 in the control center drops out again and switches off the pulse generator 6 with its contact 181, so that the rotary selector 7 remains in the position it has now reached because of the stopping criterion given by the detector. The lamp 44 lights up via the fallen contact 18 and the rotary arm 7 "'and shows the control center which detector has called it. The relay 20 then comes delayed via the contacts 183, 194 and sets the line through its contacts 201 201 2 to the positive pole of the battery 3. Via the double lines 1, 2 and the circuit elements 25, 39 of the detector shown in FIG g. 5): + battery 3, contacts 191, 201, relay windings 17 ", 18", transformer windings 48 "to 50", line 2, directional conductor 37, 35 via the transformer winding 51 ", changeover contact 223, relay 25 or telephone device 8 , Directional conductor 39, changeover contact 222, directional conductor 31, 33 via the transfer winding 51 ', line 1, transfer winding 50' to 48 ', relay windings 18', 17 ', contact 191, on-switch 11, - battery 3. 2) The relay 25 switches with his switchover account kt 251 the rotating beacon 47 and the relay 24 and instead initially holds the relays 22, 23. The now opposite to the quiescent current of the system in the line 2 via the directional conductors 37, 35 and in the line 1 via the directional conductors 31, 33 flowing direct current switches the windings 51 ', 51 "against each other again with regard to the effect on their associated common magnetic circuit of the transmitter 51, the dial-up connection is therefore again suppressed, and the transmitters 51 in the individual detectors cannot attenuate the alternating current of the telephone connection. If the handset 10 'is hung up again in the control center after the end of the call, the relays 19, 20 in the control center and the relays 25, 23, 22 in the detector drop off one after the other, because the quiescent current of the system does not return until contact 233 is closed can flow. The rotary selector 7 receives reset pulses via contact 193, the rotary selector arm 7 "and the pulse generator 6 and returns to its starting position, and the closed-circuit current of the system brings the relay 17 back accept or; call the individual detectors again. If, on the other hand, the message button 16 has been pressed in one or more other detectors in the meantime, the associated contacts 23.1 interrupt the conduction path for the quiescent current, and the test relay 17 gives another alarm via the alarm clock 5. If then the supervisor in the control center again picks up the handset 10 ', the process just described continues as often as the detectors have given the alarm and an active or voice connection has been established with them.

If the control center wants to call a detector and turn on the rotating beacon 47 there, one of the call buttons 13 to 15 must be pressed briefly, a downstream timer being able to ensure the target closing time of, for example, a hundred milliseconds. So if, for example, the call button 13 is pressed to the in F i g. To call the detector shown in FIG. 2, it brings the relay 19 via the directional conductor 27, which prevents detour currents, and switches on the generator 52 at the frequency f 1. The relay contacts 191, 191 then cause a current curve> according to FIG. 4, which establishes the dial-up connection and excites the frequency-dependent relay 21 via the transformers 48 and 51 by the control currents of the frequency f 1 generated by the generator 52. This brings the relay 22 via the contact 211, and its changeover contacts 221, 22 switch the directional conductor 38 and the winding 24 'into the double line 1, 2. After opening the call button 13, the original quiescent current of the system flows in this again according to FIG. 3 and brings about the slow-release relay contacts 221, 223 and the isolator 38 by means of the winding 24 ", the relay 24, which extends over its contact 242 and the winding 24 holds' itself and thus also the rotating light 47 turns on. This and the relay 24 can be switched off again by the control center by pressing the call button 13 again for a sufficiently long time. If necessary, the aforementioned timer, which limits the closing time of contact 13 to about one hundred milliseconds, must be switched off so that relay 20, delayed by about this time, can respond. then namely 5 logs, however, a current flows in accordance with F i g. via the twin conductor 1, 2, so that the relay 25, as described above, return the entire system to the starting position. a from the detector with the Rundurnleuchte 47 summoned person their opening willingness the control center, by pressing the message button 16, the control center now provides the active or . Establish a voice connection to the reporting office, and all further processes then proceed as already described. The relay 24 and the rotating beacon 47 are then also switched off by the relay 25.

Instead of the one shown in FIG. 2 illustrated magnetic circuit 51 in the form of a transformer with two control windings 51 ', 52' and the two directional bridges 30 to 37, a transformer with four identical control windings can be provided, as is not shown in detail in the drawing. A directional conductor must then be proposed for each control winding, and two control windings with their associated anti-parallel directional conductors are to be looped into a line, that is, one control winding pair into line 1 and the other control winding pair into line 2 . The control windings are to be arranged in the common magnetic circuit 51 in such a way that the currents caused by the selection alternating current flowing over the lines 1, 2 cancel each other out of the two effective control windings in the magnetic circuit 51 when the lines 1, 2 according to F. i g. 3 and FIG. 5 flowing direct currents are directed in opposite directions, while the throughflows caused by the selection alternating current flowing via the lines 1, 2 add up to the other control windings which are then effective when the direct currents according to FIG. 4 flow in the two lines 1, 2 in the same direction.

Used instead of a transformer by a relay or a stepping mechanism provided with four identical control windings and these, in the same way as already described above for the transformer, each with a correspondingly polarized directional guide upstream, so stand out the according to F i g. 3 or F i g. 5 flowing currents corresponding throughflows in the relay or the step switch on, while those of the according to F i g. 4 flowing currents caused flooding become effective in the relay or the stepping mechanism. With this, for example Direct current impulses (selection currents) act on the relay or the stepping mechanism and adjust them accordingly. Instead of frequency-dependent selective Switching means can then select the calling or to be called station by a Pulse dialing takes place.

Claims (7)

Claims: 1. Safety reporting device in which a Number of external detectors via a quiescent current through which all detectors flow, symmetrically grounded double line is connected to the alarm center, which is from each detector can be called through selective, each controllable via a magnetic circuit Switching means that connects the active or voice connection to the desired detector, d a d u r c h e k e n n -z e i c h n e t that each magnetic circuit (51), via the the selective switching means (21) can be controlled in a detector, an even number geicher, assigned in equal parts to the two lines (1, 2) of the double line Has control windings (51 ', 52 ") and that these control windings (51', 51"), through switches (30 to 37) controllable with direct current in the two lines (1, 2) can be looped in symmetrically, to switch the dial-up connection between the control center and the individual detectors for the magnetic circuit (51.) or can be switched against each other. 2. Device according to claim 1, characterized in that that the switches that can be controlled by direct current are one in each of the two Leiturigen (1, 2) switched directional bridge (30 to 33, 34 to 37) and the magnetic circuit (51) are a transformer with two identical control windings, each of which is a control winding (51 ', 51 ") can be switched in series q with a directional bridge in such a way that the of the alternating current flowing over the two lines (1, 2) via the corresponding effective control windings (51 ', 51 ") in the magnetic circuit (51) acting fluxes cancel each other out when a direct current controlling the directional conductors (30 to 33, 34 to 37) in the two lines (1, 2) flows in opposite directions and the floods add up if two direct currents controlling the directional conductors (30 to 33, 34 to 37) in the two lines (1, 2) flow in the same direction. 3. Device according to claim 1, characterized in that the switches controllable by direct current each have two Directional conductors and the magnetic circuit connected anti-parallel in each of the two lines (1, 2) (51) are a transformer with four equal control windings, each of which is a control winding can be connected in series with a directional conductor in such a way that the from the over the two Lines (1, 2) flow alternating current via two effective control windings in the magnetic circuit (51) acting through-flow cancel each other when a directional ladder controlling direct current in the two lines (1, 2) in opposite directions flows and these floods add up when two controlling the directional ladder Direct currents in the two lines (1., 2) flow in the same direction. 4. Establishment according to claim 1, characterized in that the switches controllable by direct current two directional conductors and connected anti-parallel in each of the two lines (1, 2) the magnetic circuit is a relay or Sohrittschaltwerk with four identical control windings are, of which each control winding can be connected in series with a directional conductor is that the direct currents flowing from the two lines (1, 2) over two effective control windings in the magnetic circuit (51) cancel each other out when there is a direct current controlling the directional conductors in the two lines (1, 2) flows in the opposite direction and these flows add up, if two direct currents (selection currents) through the directional conductors in the two Lines (1, 2) flow in the same direction. 5. Device according to claim 1, characterized characterized in that the switch controllable by direct current one in each of the two lines (1, 2) switched directional bridge (30 to 33 or 34 to 37) and the magnetic circuit. (51) a transformer with two identical control windings (51 ', 51 ") are, of which each control winding (51 ', 51 ") so in the M.eßdiagonal of a directional bridge (30 to 33 or 34 to 37) is switchable that the of the two lines (1, 2) alternating current flowing through the two control windings (51 ', 51 ") The fluxes acting in the magnetic circuit (51) cancel each other out when the directional ladder (30 to 37) stouernder direct current in the two lines (1, 2) in opposite directions Direction flows, and these flows add up when two the directional ladder controlling direct currents flow in the same direction. 6. Device according to claim 1 or following, characterized in that each detector in one of the quiescent current the system through which the current paths (30, 51 ', 32 or 34, 51 ", 36) a closed, preferably bistable, in the idle state, in particular has a switch (23) which can be actuated by a message button (16). 7th Device according to Claim 1 or the following, characterized in that in each Detector a switch (23) is provided, which after pressing the message button (16) the. Shutdown of the corresponding detector in the line (1, 2) following Detector prepared by the management, and that in each detector a further one from the Central controllable, preferably bistable switch (22) is provided to the the detector following the detector in the line (1, 2) and two by direct current Switches (38; 24 or 39; 25) which can be actuated in different polarity in the line (1, 2) to be switched on. B. Device according to claim 1, 2, 3, 4 or 5, characterized in that that the individual detectors have frequency-dependent switches (21), through the line (1, 2) from the control center to the same control windings (51 ', 51 ") of the common magnetic circuit (51) given control currents of different Frequency of the active or telephone connection from the control center to the desired detector switch through. 9. Device according to claim 1, 2, 3, 4, 5 or 6, characterized in that that in a selected detector an alarm device (47) provided there by the Quiescent current of the system can be switched on. 10. Device according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that one provided there in a selected detector Telephone device (39; 8) and a switch optionally provided there (39; 25), which switches the detector back to the starting position, by means of a direct current can be operated with the quiescent current of the system of opposite polarity. Into consideration Extracted publications: German Auslegeschrift No. 1082 630.