DE189434C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 189434 CLASS 74 c. GROUP

SIEMENS & HALSKE AKT-GES. in Berlin.

Receiving device.

Patented in the German Empire on August 21, 1906.

The invention relates to fire alarm systems with several independent detector loops, which work on common receiving sets, and has the content that not, as previously usual, formed independent local circuits for the receiving sets and the incoming messages are transmitted by relays from the detector loops to the local circuits of the receiving devices

ίο be, 'but that if a reporter is one Line loop comes into operation, the receiving sets with this line loop are automatically switched in series so that they receive the incoming messages immediately take up.

In the drawing, a fire alarm system is an embodiment of the invention with safety circuit, d. H. such a system is shown in which two at the same time Detectors can run without mutual interference and in the case of which, furthermore, due to a wire break, the operability of the Plant is canceled.

In the drawing, two detector loops I and II are assumed and a detector m _x respectively in each loop. m. ₂ drawn. In the detectors, the line is routed through a contact, the moving part of which rests conductively on a type disc.

The latter is automatically connected to earth when the detector is used and therefore brings when running down the movable contact part with both the fixed contact part as also alternately in and out of connection with earth, in a sequence peculiar to the detector.

In the control center, each line loop is a switch relay T ₁ respectively. r ₂ with the two windings V ₁ , W ₁ respectively. V ₂ , W ₂ assigned. This controls with its anchor a _x respectively. a. ₂ the circuit of a drop relay S ₁

respectively see ₂ , the drop lever L · or. Load

45

G
grounded

Changeover switch U ₁ respectively. u ₂ , through which the receiving devices are connected in series with the loop line. The receiving machines are formed by two Morse code machines M ₁ and M ₂ , between the one in the middle
Battery E is on.

_{A switch Z 1} respectively belongs to each loop line. Z ₂ , which is changed manually in the event of a line break.

In the normal state of the system, the switches Z ₁ and Z _{2 are} in the position shown. In this case, a quiescent current is maintained in the line loop I through the entire battery e _x , which flows from this via winding V ₁ , line A ₁ , switch U ₁ , line ^, loop I, line A _& , A ₁ , A ₆ back to the battery C ₁ runs. As a result, the relay T _{1 is} excited and the armature a _x rests on the upper of the two contact pieces, between which it is movable. If the detector Mt ₁ is now pulled, the first tooth gap of the type wheel interrupts the line of the quiescent current and the relay armature α _λ falls on the lower contact

clock piece. This closes the circuit of the relay S ₁ , which leads the battery b and the alarm clock W via the left arm of the switch t _v. As a result, while the alarm clock starts ringing at the same time, the lever Ic ₁ falls down and turns the switch M ₁ to the left. In this way, according to the invention, the Morse code machines M ₁ and Af ₂ and the battery E between them are connected in series with the loop I, namely the newly formed current path runs from the battery E via -B ₁ , receiving apparatus Af ₁ , line B ₂ , B ₆ , switch M ₁ , line A ₂ , A _h , Β _Ά , B ^, receiving apparatus M ₂ and line B ₅ to battery E back. The battery E is grounded in the middle, so that if the teeth of _{the wheel ground the line when the type wheel in the detector Wz 1} runs down, a ground fault is established between the detector and the center of the battery E. However, if the resistances of the two line branches between the detector and the control center are not too different, only little or no current is generated via this.

In the same way as loop I, loop II becomes one of its when you pull it Detectors connected in series with the receivers.

In the present circuit, as indicated, it is now to be prevented that the message of the detector MJ _{1 in operation} is disturbed by the fact that. Another detector is pulled in the same loop or in loop II, and the message from the detector pulled in twos should also arrive unmutilated. This is achieved by the fact that the earth connection with the center of the service battery E, which does not become effective when only one detector is running, always comes into effect when the metallic line of one detector is interrupted by a tooth gap in the type wheel of the other detector. One detector then works independently and exclusively on the receiver Af ₁ , the other independently and exclusively on the receiver Af ₂ .

The further specified condition that in the event of a wire break the operability of the System is maintained is fulfilled in the following way:

Occurs in a loop, e.g. B. I, a wire break, the relay T _{1 is} de-energized and drops its anchor, the alarm clock W sounds and the lever A ₁ puts the switch U ₁ to, but the expected message from the receiving equipment remains. This makes the occurrence of the wire break recognizable to the officer of the control center, and he now has to put the switch t _t in the middle position and raise the lever U ₁ again. The latter is possible although the armature a _x rests on its lower contact, because the current path of the relay S ₁ leads through the upper armature contact after the switch J _{1 has been flipped.} If a detector is now pulled in loop I, after it has been automatically grounded, a current flow is established, which flows from the battery e _x via V ₁ , A ₁ , U ₁ , A ₂ , earth, Y, A _s to the center of the battery O ₁ runs. As a result, by tightening the armature Ci _1, the circuit of the relay S _{1 is} closed, the switch U _{1 is} thrown and a circuit from the battery E via B ₁ , M ₁ , B ₂ , B ₆ , A ₂ and via the earth to the center the battery E closed. If the line loop between the detector and the right arm of the switch M _{1 is} broken, the Morse _{code device Af 1 is put} into operation. If, on the other hand, the line loop between the detector Mi ₁ and the left arm of the switch M _{1 is} broken, the Morse code device Af _{2 is} replaced by one in the circuit E, B ₅ , Af ₂ , B ₄ , B ₃ , A _h , loop I, Wi ₁ and earth after the middle of the battery E is put current flowing into action. In the first case, a detector from the Schleifell or a detector located in loop I on the other side of the break can be pulled without the two messages interfering with each other, since a second independent message circuit is then formed via the Morse code Af ₂ and earth.

The prerequisite for this mode of operation of the circuit is that the wire break did not result in a ground fault in the line. The conditions change, however, when such a ground fault is present. In this case, which can be recognized by an earth fault indicator not shown in the drawing, the officer must not put switch Z ₁ in the middle position, but must first move it to the right end position and raise the lever Ar ₁ . If only one branch of the broken line has come to earth, one winding of the relay T ₁ receives current after turning the switch ^ ₁ via the right arm of the same, as in the case of a simple wire break when using a detector, and the current path of the relay S ₁ , which now again leads through the lower contact of the armature α _λ , is therefore open, so that the drop lever remains in its position after it has been raised. Now when pulling a detector, if it is in the part of the broken loop that has come to earth, the current path of the coil V ₁ through which the quiescent current flows is interrupted by the first tooth gap, and so on

Claims (3)

the anchor ^ ₁ caused to fall, or it is, if the detector is in the isolated remaining part of the line loop and z. B. Line A _b is broken at V and grounded at E ₀ , so that a current path from e _x via W ₁ , A ₁ , A _v A ₅ , E ₀ , Y, A _s to the center of the battery ßj is created the automatic earthing of the detector forms a second circuit, namely from C ₁ to V ₁ , A ₁ , ίο A ₂ , earth, Y, A _s to the middle of the battery e _v As a result, the coil V _1, through which no current flows until then, also receives current. The coils V ₁ and W ₁ are now wound in opposite directions, as shown in the drawing, so their effects cancel each other out and relay r _{1 when current flows through them in the same direction, as is the case here} is therefore also demagnetized in this way and drops its anchor. Regardless of which part of the line the detector is in, switch U _{1 is} thrown and a detector circuit is now formed via earth, which contains the Morse code M ₁ or Af _{2 depending on the location of the wire break.} If both parts of the broken line have come to earth, then the case occurs that both the winding V ₁ and the winding W ₁ receive current in the same direction after moving the switch t _x to the right end position from the start and that Erecting the drop lever U ₁ therefore does not succeed. The switch ^ ₁ must then be brought back to the left end position, whereby the state of the system is similar to the normal state again, only that after switching the switch U ₁ between the wire break point and the middle of the battery E, a shunt to earth is detected is formed, which receives one of the two Morse code permanently in the idle state respectively. runs empty. Pat ε nt-An Proverbs: i. Fire alarm system with one common for several loop lines Receiving device, characterized in that it is automatically connected to the line loop when a message is issued is connected in series. 2. Embodiment according to claim 1, characterized in that the receiving device consists of two Morseapparaten and a battery (E) located between these, which is grounded in the middle, and that the loop line in each detector when using the same automatically placed and is also disconnected from earth at the same time as the interruptions used for signaling, for the purpose of eliminating mutual interference when two detectors run off at the same time, and to maintain the operational capability of the system in the event of a line break. 3. Embodiment according to claim 2, characterized in that the series connection the receiving device with the line loop through a relay with two oppositely wound Coils is effected, which is switched by hand so that a) in the normal state of the system or in the event of a line break with mutual earth fault a partial winding is traversed by quiescent current and by the interruption the same when the detector is used, the switchover is effected, b) In the event of a line break without a ground fault, neither of the two partial windings is traversed by the current and, when using a detector, causes the switchover that a winding receives current, c) In the event of a line break with a one-sided earth fault, one part winding is traversed by quiescent current and when using a detector the switchover causes the . other winding receives current, which has the effect of the first practically cancels. 1 sheet of drawings. Berlin. printed in the Reichsdruckerei.