DE239981C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 239981 CLASS 74 c. GROUP

ALBERT GOLDSTEIN in NEW YORK.

Patented in the German Empire on July 8, 1910.

The invention relates to a circuit arrangement for electrical signal systems, especially for fire and burglar alarm systems, on one arrangement of the kind in which from a receiving point after a number of in series switched reporting points a single double line is performed, whereby the facility is made such that in the case of the commissioning of a detector, the commissioning of the other detectors is prevented automatically until the first one started Detector has given its signal and has returned to the rest position.

According to the invention this is achieved by using hot wire switches in the Alarm devices which, when heated to a sufficient temperature, keep the alarm in action are set, and which are arranged and switched such that during the Operation of one detector, the current for the heating coils of the switches in the other detectors is periodically interrupted and for the heating of the associated switch and the Commissioning the detector in question is no longer sufficient.

The drawing . shows in Fig. 1 an embodiment of the invention. Fig. 2 shows the particular embodiment of a thermostat.

In Fig. Ι the receiving station with the electromagnets D, E, the signal lamps P, Q of the subdivided central battery A and the local battery L is shown in the right part.

The signaling takes place in a known manner by means of the signal lamps mentioned.

The receiving station is connected by lines 1 and 25 to three reporting points T, T ¹ , T ² connected in series. At each substation there is a button 0 or o ¹ or o ² , which opens contact 6 or 14 or 22 in the working position and closes another contact 47 at detector T. There is also a hot wire switch S ⁴ at each reporting point, the heating coil of which has a very high resistance of 20,000 ohms and encloses a current connector made of two different metals. As soon as a stronger current flows through this spiral, the uneven expansion of the two metals causes the body to bend, as a result of which contact 44 is closed and part of the high-resistance spiral is switched off.

There are also two further hot-wire switches S ² and S ³ at each substation, the spirals of which are equipped with lower resistance. In the idle state, these switches each hold a contact 2 or 8 closed. As a result, the electromagnetic coils W ¹ , W are short-circuited. When the hot-wire switch is in the working state, the aforementioned contacts are open and, as a result, current flows through the electric magnets W ¹ , W. The operation of the hot wire switch itself is the same as that of the S ⁴ thermostat.

By exciting one or both magnets W ¹ , W the blocking of a watch

Work or a similar automatic device canceled by moving the lever h or t laterally or by moving it downwards. As a result, a cam disk N and a signal wheel M start rotating. The signal wheel is provided with teeth over which a double spring m, m ¹ slides. This results in a certain way for the purpose of signaling after the receiving station

ίο Power closures and interruptions. The lifting disk N has an edge made of insulating material with a notch in which the extension η of a switch engages when the detector is in the rest position. When the detector is in the working position, this extension of this switch slides out of the notch and thereby folds a contact arrangement 4, 31, 30, 34. After one revolution of the cam plate N , the extension η slides back into the notch, so that the original rest position of the contact arrangement is restored.

The mode of operation of the arrangement is as follows. When the system is in the idle state, a quiescent current flows from the subdivided central battery A via D, contact 2, current connection piece of switch S ² , line 3, contact 4, line 5, contact 6, line 7, current connection piece of switch S ³ , contact 8, line 9 , Current connection piece of switch S ⁵ , line 11, contact 12, line 13, contact 14, line 15, current connection piece of switch S ⁶ , contact 16, line 17, contact 18, current connection piece of switch S ⁸ , line 19, contact 20, line 21, contact 22, line 23, current connector of switch S ⁹ , contact 24, line 25, magnet E to battery A back. This current keeps D and E excited.

As soon as contact 6 is opened by pressing the push-button lever at one of the reporting points at T , the current flows from A via contact 2, current connection piece S ¹ , heating coil S ² , lines 28, 29, contacts 30, 31, line 32, coil S ^s , Current connector from S ³ , contact 8, line 9 and from there on the above-mentioned path, namely via 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 , E back to battery A.

The current flow through the heating coils of the thermostats S ² , S ³ thus comes about in that the contact 6 is opened and the short circuit for these coils is thereby canceled. As a result of the occurring therein current flow, the spirals mentioned heat the surrounding of them current circuit pieces and open in the manner already described, the contacts 2 and 8. This contact opening eliminates the short circuit of the solenoid coil W ¹ and W, so that this by way of A ₁ D ¹ , W ¹ , spiral S ² , 28, 29, 30, 31, 32, spiral S ³ , W, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, E, A are excited.

This excitation has the consequence that W ¹ , W. attract their common anchor and activate the detector in the manner described above. The disk N and the signal wheel M come in a single revolution. The disk M connects the line 1 via contact 36, contact 34 to earth G ¹ at certain intervals. In the same way, the other connecting line 25, which leads to the substations T ¹ , T ^{in a manner already repeatedly described, is connected to ground G 1} via line 9, W, S ³ , 32, contact 35, contact 34 at certain intervals. The consequence of this is the signaling to the electromagnets D, E and the signal lamps P, Q.

If so, the push button would have been depressed and contact 14 opened during the signaling by the detector T in another detector, for example T ^1. In this case, due to the grounding G ¹ in the station T and due to the contact opening 31 and 30, only short current pulses would flow through the spirals S ⁵ , S ⁶ in the detector T ¹ according to the movements of the switch m ¹ , m in the detector T. These short current pulses would not be sufficient to heat ^{the thermostats S 5} and S ^{6 sufficiently.} Only when the normal closed circuit is restored after the activity of the detector of the station T , the spirals S ^& , S ^s can heat up, provided that contact 14 in the substation T ^{1 is} still open.

It will now be described in which Way the system works if there is a break in one of the connecting lines 1 or 25 occurs.

Assuming that a break would occur in line 1 at point, ζ , since the closed circuit is interrupted, no effects whatsoever would occur as a result of the break by pressing the push button in substation T. In order to prevent such a disturbance, the hot wire switch S ^{4 is} arranged. As soon as a break has occurred at point ζ ^{, the thermostat S 4} , which is connected to earth G ¹ on the one hand, and via contact 47, line 45, contact 31, line 32, spiral S ³ and contact 8 to the line, is activated by pressing the push button 9, which leads to battery A in the manner already described via the detectors T ¹ , T ^2; As a result, the current connection body of S ^{4 is} heated and closes contact 44 in a known manner. This contact closure has the sole purpose of ^{reducing the high resistance of the thermostat S 4 to} such an extent that the thermostat S ^{3 has} enough current flowing through it to close contact 8 open and

to bring the electromagnet W to respond by removing the short circuit. The detector is put into operation by tightening the armature w.

If the break in z ^{1 of} the line 25 would arise, the hot wire switch S ² would be heated on the path A, D, τ, 2, spiral S ² , 28, 29, 30, 45, 47, 44, G ¹ and the Bring electromagnet W ¹ to respond.
It can therefore be seen that the detectors remain operational even in the event of a break.

Claims (2)

Patent Claims: i. Circuit arrangement for electrical signal systems, in particular for fire and Burglar alarm systems in which several are connected in series Signaling apparatus connected to a receiving point via a shared double line and the detectors are set up in such a way that they can only be put into operation one after the other, characterized in that that the commissioning of a detector takes place through the intermediary of hot-wire switches, which are only sufficient- get the electricity to warm up to the operating temperature when no one else is Detector is in signaling at the same time. 2. Circuit arrangement according to claim 1, characterized in that in the case of the A break in one of the lines leading to the control center ensures that the system is properly commissioned of a detector takes place over the undamaged line alone, whereby the for this purpose earthing required by the reporting office by means of a special hot-wire switch takes place with a heating coil of high resistance, which is connected so that he due to the high resistance of his heating coil when in proper condition of the lines does not come into operation. 1 sheet of drawings.