SU2048A1 - Device for automatically blocking eight telephones connected to one common line - Google Patents

Description

The proposed device aims to enable the inclusion of up to eight telephone exchanges in the same common trunk line, with the possibility of using the trunk line by subscribers. At the same time, since the provision of the trunk line of one of the stations, only this latter gets the opportunity of its own choice to be demolished with all other stations and with their subscribers; other stations, with the exception of the one from which the entire device is continuously controlled, are automatically blocked.

FIG. 1 and 2 depict the corresponding device diagrams.

At each station, an apparatus is connected in parallel to the trunk (Fig. 1), containing the following parts:

1) inductor G, generating a pulsating direct current of both directions, removable by brushes A and

2) eight keys (push buttons without arresters), numbered from №№ 1 - 8. Each of these keys contains two quiet contacts and two or three working contacts; the contacts are shown in the “triangles” scheme, and the isolation of the springs from each other is indicated by hatching; 3) blocking rel

MI, comprising two electromagnets: R - polarized and non-polarized, with their windings divided into two sections (upper and lower), ending with terminals / - 8. Anchor CD, rotating around axis C, is normally attracted to polarized an electromagnet a, in which position the magnetism of this electromagnet is capable of overcoming the elasticity of the pull spring N. If the magnetism of the electromagnet R is weakened by the current of the corresponding direction, then. under the influence of the spring L, the measles CD will retreat to the contact /// and remain in this position even after the current is turned off; back to the normal position, the CD pin can be brought by passing a current of a certain direction through the winding of a polarized electromagnet R or a current of any direction through the winding of an unpolarized electromagnet RI. When the CD box goes to the /// contact, both this contact and the contacts / and // are closed. The operation of the RR occurs by sending in line eight different combinations of currents from both directions, namely: 1) -Ь.1, -JT, 2) -Ji + 4, 3) +,

4) -L, 5) + J ,, 6) -L, 7) + Ji + -j-Jjj 8) - Ji - L.U- In the first two combinations, the circuit is composed of both linear wires L and J, without the fate of the earth; one or the other of the wires L or L is involved in the following four circuits, the earth being the return wire; Finally, in the last two circuits, both wires connected in parallel are a straight wire and the earth is reverse.

By means of the / - // rel I / T terminals of each apparatus, one of the eight eight combinations listed is configured, the principle of which is explained in FIG. 2, on which two relae are given as an example, indicating the combination of currents to which each of them is “tuned.

If the relay RRi needs to be tuned to a current circulating only in one of the wires (therefore, to the combination -f Ji or -It or + L ",}, then both sections of each of the electromagnets are connected in series, so that two continuous windings are obtained belonging to: one polarized electromagnet R, and the other to a non-polarized electromagnet, these windings are then included in both linear wires and in the ground, as shown in Fig. 2 (see rel - {- JJ, i.e., one end of the winding field The electromagnet R is connected to that of the line wires ( In this case, Jj), which is included in the combination of a tunable relay, and the other end of the same winding is connected to ground; it also takes into account the direction of the current from which the relay should operate. As for the unpowered electromagnet Dt, this one Its end is connected to that of the linear wires (in this case, L), which is not included in the combination of the tunable relay, and its other end is connected to the ground. These windings are not directly connected to the line wires Ji and la and are included, as can be seen from FIG. 2, not to the terminals L and L and to the terminals 9 and 77. Terminal 9 is connected to the short terminal L through the successively connected contacts of all eight keys nos. 1-8, and the terminal 77 in the same way connected to the terminal la. Thus, when pressing any of the keys, the windings of both electromagnets are turned off from the line.

The results, which result from "tuning to the current circulating only in one of the wires, are the following: when sending currents to both wires at once (consequently, with the combinations + Ij - la, or -li + IE, or + li + la, or - li - la) each of the rela, which is tuned to a current circulating in only one of the wires, will not change its initial position, indicated in fig. 1 and 2, since this causes the excitation of the neutral electromagnet RI. When sending the current to only one of the wires, only one of four rela will work, in which, firstly, the winding of its polarized electromagnet R is included in this wire, and secondly, the current must pass through this winding in such a direction that the magnetism R is weakened (in Fig. 2, the direction weakening the magnetism R is assumed to be clockwise).

As for relays / fi, which need to be “tuned to a combination of currents sent directly to both wires (i.e., to the combination -f Ij - L, or - li + Is, or + li + 2, or -li -la), TO do this (Fig. 2): first of all, they connect in series the same-named sections of electromagnets and and / (i.e., both the upper and both lower), so that two continuous windings are obtained, each of which belongs to both electromagnets . Then these windings are connected to terminals 9, 70 and 77, as shown in FIG. 2, to guide this principle, so that when this current is combined, the action of the currents coming from both wires will be in a polarized electromagnet R and mutually destroyed in a non-polarized electromagnet

FJ.1, U.-1 7 I; РI i with -ТТ -i I bFFx, :: I / d I П 511

to Li (via the keys Jfjf 1-8) .KJls (4epes keys ffff 1-8)

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