US2673246A - Commutator having a multiple marking in common with several marking devices - Google Patents

Description

March 23; 195 1 H. L. LESIGNE 2,673,246 COMMUTATOR HAVING A MULTIPLE MARKING IN COMMON WITH SEVERAL MARKING DEVICES Original Filed May 20 1946 fA/l/i/vrae Patented Mar. 23, 1954 COMMUTATOR HAVING A MULTIPLE MARK- ING IN COMMON WITH SEVERAL MARK- IN G DEVICES Henri Louis Lesigne, Vanves, France, assignor to Compagnie Continuation of May 20, 1946.

Generale France, a corporation of application Serial N o.

This

dElcctricite, Paris,

France application October 17,

1951, Serial No. 251,766

4 Claims. 1

This application is a continuation of my application Serial No. 671,033 filed May 20, 1946.

This invention relates to switching devices such as those used for automatic telephony, the setting of which is eifected by means of a common marking multiple.

A marking system is known which for controlling the positioning of a selector, uses an isolated source of direct current arranged in each register, that is to say, a direct current source having no point in common with the battery of the automatic switching system, or with the other similar direct current sources arranged in the other registers. The circuit of the isolated source of one of these registers is closed over a marking wire common to several registers and several selectors and the brush of a selector, whereby a relay of this register, serving to stop this selector, is operated.

In this prior arrangement nevertheless, it is necessary to prevent that two marking circuits of two different registers and two different selectors get connected in series, that is to say, that the selector controlled by a first register should pass over the terminal marked by a second register, when the selector controlled by this second register passes over the terminal marked by the first register. In order to remedy this disadvantage of this prior arrangement, all the selectors could be made to operate starting from a homing position. This solution presents the disadvantage that it occasions a waste of time due to the homing of the switches after each rotary sweeping operation.

The object of the present invention is a device which prevents wrong connections, while at the same time not imposing a homing position upon the selectors, and allowing the simultaneous use of the common marking multiple by several registers and selectors. This device is essentially characterized by the fact that the two marking circuits of two selectors, the positioning of which is effected through a common marking multiple, are each dependent on an individual member which, when the aforementioned stopping relay of a register is operated, becomes active so as to upset the symmetry of the single circuit which is closed in the event two different marking circuits should be connected in series as mentioned above.

According to a preferred form of the present invention, the member which upsets thefsymmetry of the marking circuits of two selectors, is a relay mounted in such way as to vibrate with a certain frequency.

The operation of the device which forms the subject matter of the present invention will be early understood by referring to the following specification and the drawings in which:

Fig. 1 represents a greatly simplified diagram of the marking circuit of a selector and the circuit produced by the tangling of the connections between two selectors; and

Fig. 2 shows in greater detail a diagram of one normal marking circuit without the entanglement just mentioned and the device to which the invention relates.

Fig. 3 shows the application of the device shown in Fig. 2 to the entangled circuit shown in Fig. l.

With reference to Fig. 1, A represents a first register controlling a first selector SI, of which the brush CSI hunts for the terminal bib designated in the register A by the position of the marking switch D; likewise 13 represents another register which controls another selector S2, the brush of which CS2 hunts for the terminal 1:22.

In each of the units A or B, U represents an isolated source of direct current.

The circuit of the blocking relay I in A is normally closed when CSl passes over (:15 through:

The positive pole of U, relay l, brush of marking switch D, a terminal of this switch, marking wire 5, terminal M5, the brush CSI, relay contact 2| and the negative pole in U.

Likewise the marking circuit in B is normally closed, when CS2 passes over the terminal 1922. It may happen, however, that the brush CSI in SI passes over the terminal hi2 (which is connected to the terminal 1222 through marking wire 2) at the same time as the brush CS2 passes over the terminal Z225 connected to the terminal bii. The following circuit is then closed:

The positive pole of U in register A, relay I, marking switch D, marking wire 5, terminal b25, brush CS2, then in register B relay contact 2|, the negative pole of U, the positive pole, relay I, marking switch D, marking wire 2, terminal bl 2, brush CSI, then again in register A, 2! and the negative pole of U.

The two sources U are thus put in series, while the circuit comprises furthermore the two stopping relays I which are energized, which causes the stoppage of the two selectors SI and S2. No current passes through the two relays 3; the difference of potential at their terminals is zero, because on one hand both relays I are identical and therefore have the same resistance and on the other hand the voltages of both sources U are equal.

The device to which this present invention refers makes it possible to introduce a dissymmetry which causes the operation of one of the relays 3 which is devised so as to operate the starting of the selector controlled by the register of which the relay 3, which has operated, is a part.

This dissymmetry is' obtained by providing, in each register, a vibrating relay 2 which, when vibrating, periodically inserts a resistance RI into the above traced circuit which comprises the two sources U.

Although both relays 2 are adjusted in a similar manner, they will never operate absolutely identically. At a certain moment, the relay 2 of A, for instance, becomes energized, when the relay 2 of B is at rest. The potential difference of the terminals of the relay 3 of the marking device A is then no longer zero and said relay becomes energized. v

The relay 3 ofv the marking device B cannot become energized, because it is in series with a rectifier X, the passage direction of which is opposed to the difference of potential so produced.

As explained below with respect to Fig. 2, the operation of the relay 3 of A causes SI to resume its rotation and the two marking relays I to release, so that the two selectors SI and S2 continue their hunting.

In Fig. 2, the selector SI is shown connected to the register through a link circuit finder, two brushes of which Cw and Rw are represented.

The relay 2 is actuated through front contact I2 and vibrates on its back contact 22, thus periodically inserting resistance RI owing to its contact 2|.

The relay 3 can have a second (lower) winding which prepares for its operation, which is thus made more rapid. r

Relay I controls the stoppage of selector SI through its contact II. v

If the marking circuit is the normal one, illustrated by Fig. 2, both extremities of the winding of relay 3 are at the minus potential of the U battery and relay 3 does not operate.

If, however, the above traced wrong circuit illustrated by Fig. l is closed, relay 3 operates, as explained above.

The operation of relay 3 results in the closing of its contact 32 and therefore in the actuation of selector SI. On the other hand it causes the opening of contact 3 I the opening of the marking circuit, which passes through thiscontact, and the release of relay 1 through which passes this circuit. The opening of contact I2 of relay I opens the circuit of the lower winding of relay 3.

It is of course possible, without departing from the scope of the present invention, to replace the vibrating relay 2 by any other device entering into action when the stoppingrelays I operate and causing a dissymmetry of the marking circuits of the two selectors.

I claim:

1. In an automatic switching system: two registers each of which comprises a self-contained battery, a marking switch having a row of terminals and a wiper lying over one terminal of said row, a first relay and a connection between one terminal of said battery and the wiper of said marking switch through the winding of said first relay; two selectors each of which has a driving electro-magnet capable of being inserted in an actuating circuit and a wiper capable of hunting over a rOW of terminals; means for connecting the wiper of any one of said two S9180". tors with the other terminal of the battery of any one of said two registers and for simultaneously connecting the winding of the electromagnet of the same selector with a back contact of said first relay of the'same register; a connection between each terminal of the marking switch of each of said registers and one terminal of each of said selectors respectively; in each register a connection, comprising the winding of a second relay and a rectifier, between said wiper of said marking switch and the wiper of said selector connected to said register, means for modifying the resistance of a portion of the circuit passing over the two terminals of the selfcontained battery of said register after said circuit has beenclosed and means for closing the actuating circuit of the electromagnet of said selector connected to saidregister when current is passing through the winding of said second relay.

2. An automatic switching system according to claim 1, in which said means for modifying said resistance comprise, a third relay, means for energizing said third relay when said first mentioned circuit is closed and means responsive to the flow of current through said second relay.

3. Anautomatic switching system according to claim 2, in which the winding of said third relay is connected to said means for energizing said third relay through'a back contact of said third relay.

4. An automatic switching system according to claim 1, in which said second relay has a contact arranged in said first mentioned circuit passing over the two terminals of the self-contained battery of said register for opening said circuit when said second relay is energized.

HENRI LOUIS LESIGNE.

No references cited.

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