US897413A - Signalling-circuit. - Google Patents

Description

No. 897,413. PATENTED SEPT. 1, 1908. H. O. HUGH.

SIGNALING CIRCUIT.

AIPLIQATION FILED MAY 2, 1908.

sre'rns I tIniTi-r HARRY 0., ltUGI-LOF SANDWICH, ILLINOIS.

SIGNALING-CIRCUIT.

Application filed. May 2, 1908. Serial No. 430,458.

Specification of Letters Patent. I

Patented Sept. .1, 1908.

To all whom it may concern:

Be it known that I, HARRY O. HUGH, a citizen of the United States, residing at Sandwich, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement inSignaling-Circuits, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to signaling circuits and apparatus, and will be well understood by reference to the accompanying drawing, showing the preferred embodiment thereof, there being illustrated in the drawing a signal-receiving station and a signal-sending station, together with suitable apparatus for receiving and sending signaling current.

The invention is of particular utility in con nection with telephone exchange systems, though it is not to be restricted to this service. i

I have shown a signal-receiving bell a included in circuit with a transmission line .whose limbs I) b terminate in springs c c of a spring-jack. A connecting plug is provided with contact terminals that are adapted to engage the springs 0 so that the cord circuit (1 may be caused to constitute a continuation of the transmission line b. I have illustrated the springs c of a ringing key in connection with the strands of the cord circuit d, the normal contacts of these springs effecting continuation of the cord-circuit, as is well understood, while .the alternate contacts of these springs constitute terminals connected with the circuit of a-pole-changing apparatus to be described. The position of the springs c is determined by the operator at the station where the cord circuit equipment and the pole-changing apparatus is located. 13 v The improved ap )aratus which I employ for changing the polarity of the current impressed upon the alternate contacts of the ringing key 0 will now be described. The ringing battery or other suitable source of direct current. is indicated at f, the poles of this battery being permanently connected With contact elements or s rings g h. These springs '9 andjrare provided with normal contacts and with alternate contacts. When the springs 9 audit are in engagement with the,normal contacts, current is impressed upon the alternate contacts of the ringing.

key e in a direction which may, for example,

berepresented by the arrows shown'in full lines. When the springs g and h are in engagement with their alternate contacts, current is impressed upon the alternate contacts of the ringing key in the reverse direction, represented by the dotted arrows. A polarized relay t is included in circuit with battery f and desirably in series therewith, this polarized relay being located between thecontacts-of the battery terminals 9 and h and -the alternate contacts of the ringing key (2, so that irrespective of the direction of the current flowing to the alternate contacts of the ringing key, the polarized relay i always receives current when such current is passing to the ringing key.

The. olarized relay '5 has armature contacts w iich govern a local. circuit including an electro-magnet k and a battery Z, this moving the contact terminals or springs g and h from engagement withtheir normal contacts to engagement with theiralternate contacts, the magnet 7c acting against the force of a spring m, which serves to bring the elements 9 and it into engagement with their normal contacts whenthe magnet k is not in service. It is understood, of course, that the magnet 70 possesses a force which is in excess of the spring m, whereby the shift of the battery terminals 9 and it may be effected from their normal contacts to their alternate contacts. When the operator closes the ringing key, the current that is then passed to the alternate contacts of the ringing key and throu h the relay 2', has a direction represented by the arrows in full lines, which direction is such asito shift the armature of the relay 2' to the left, thereby to close the circuit of the magnet it, so as to attract the battery terminals 9 it against the force of the spring m. lVhen the battery terminals g and h are engaged with their alternatecontacts as a consequence of theoperation of the electroe magnet 75, currentthrough the polarized re lay i is're versed, as. indicated by the arrows.

in dotted lines, whereby thearmature of the i'elay i is moved to the right to-open the local circuit including the magnet is, whereupon the spring m is permitted to restore the battery terminals g h to their normal position.

It sometimes happens that the ringing key is released at a ti e which will not permit the sufficient flow o current in the direction indicated by the dotted arrows, to enable the relay 2' to open the'circuit of the magnet k.

0 Patent tuti To prevent such an Occurrence, I provide means, supplementing the ringing key, whereby current through the relay i in the direction of the dotted arrows ma becontinned, so that the armature of sai relay i ismoved to the right, thereby to open the circuit of the magnet is and permittin .the soring mto restore the terminals g an- 72 to t 'ieir normal positions. The supplementing means desirably resides in a conductor a con taining a high resistance 0 of, say, eleven thousand ohms, which serves to continue the current from the battery f through the polar ized relay "i in the direction indicated by the dotted arrows, because of the establishment of a circuit which includes the battery the conductor a, the resistance 0, the polarized relay i, the alternate contact of battery terminal h, and said battery terminal, this circuit oecasioning the restoration of the armatu re of the polarized relay to its normal righthand position, thereby opening the circuit of the magnet 7c and permitting the s ring m to restore the battery terminals 9 am 72, to normal.

While I have herein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to the precise construction and arrangement shown, as modifications may readily be made therein without departing from the spirit of the invention, but

Having thus described my invention, I claim as new-and desire to 1. A pole-changing device including a source of current, switch elements consti terminals of said source of current, a nori'mil contact for each of said switch elements, an alternate contact for each of said switch elen'iei'its, a conductor connected with one normal and one alternate contact, a second conductor connected with the other normal and the other alternate contact, a polarized relayconnected in circuit with said conductors, a magnet for ellecting engagement between said switch elements and their alternate contacts, the switch arin of the polarized relay includii'ig said electromagnet in circuit when said relay is included in circuit with the normal contacts of said switch elements, and serving to remove said electro magnet from circuit when said realy is included in circuit with the alternate contacts of said switch elements, in combination with a switch or key for connecting the said conductors in circuit with a suitable translating device rcsponsive to the currents of changed directions, said hey also controllin the circuit re- 'lationship of said polarized re ay, and a conductor including high resistance, included in ircuit with said source of current, one of its en teri'ninals, the alternate contact of nal i the polarized relay, wheresecure by Let tc rs ear/ans remove said clectro-magnet from circuit is insured.

2. A-poJe-changing device including a source of current, switch elements constituting terminals of said source of current, a normal contact for each of said switch elements, an alternate contact for each of said switch elements, a conductor connected with one normal and one alternate contact, a second conductor connected with the other normal and the other alternate contact, a polar ized relay connected in circuit with said con ductors, a magnet for ell'ecting engagement between said switch elements and their alternatc contacts, the polarized relay including said clectro-magnet in circuit when said relay is included in circuit with the normal contacts of said switch elements, and serving to remove said elcctro-magnct from circuit when said relay is included in circuit with the alternate contacts of said switch elements, in

combination with a switch or key for connccting the said conductors in circuit with a suitable translating device responsive to the currents of changed directions, said hey also controlling the circuit rclationshi) of said polarized relay, and means supplementing the said key for maintaining the relayin circuit withthc alternate contacts in the event of the failure of said hey so to do, whereby the removal of said clectro-magnt from circuit is insured.

3. A pole changing device including a source of current, switching mechanisni for re vcrsing said current, an electro-magnet for moving the switr'zhing mechanism, a polarized relay receiving the current of different directions, operating, when receiving the current of one direction, for including said elcctro-magnet in. circuit to cll'cct its encrgization, and, when receiving current of another direction, to remove said electro-magnot from circuit, in combination with a switch or key for enabling the impression of currents of changed directions upon a suitable translating deviee; said key also controlling the circuit relationship of said polarized relay, and a conductor including high re sistance, included in circuit with said source of current and said polarized relay when the first aforesaid switching mechanism is moved by its operating electro-magnet, whereby the operation of said polarized relay to remove said electro-magnet from circuit is insured.

4. A pole changing device including a source of current, switching mechanism for reversing said current, an electro-magnet, for moving the switching mechanism, a polarized relay receiving the current of different directions, operating, when receiving the current of one direction, for including-said clectro-magnet in circuit to effect-its energization, and, when receiving current of another direction, to remove said electro-magpolarized operation of said polarized relay to i not from circuit, in combination with a able translating device, said key also controlling the circuitrelationship of said polarized relay, and means supplementing the said key for maintaining the polarized relay in a given circuit conditlon, whereby the removal of said electro-magnet from circuit is insured,

source of current, switch elements constituting terminals of said source of current, a

1 normal contact for each of said switch elements, an alternate contact for each of said switch elements, a conductor connected with one normal and one alternate contact, a second conductor connected with the other normal and the other alternate contact, a polarized relay connected circuit with said conductors, and a magnet for effecting engage-4 'ment between said switch elements and their alternate contacts, the polarized relay includin said electro-magnet in circuit when said re ay is included in circuit withthe normal contacts of said switch elements, and

serving to remove said electro-magnet from circuit when said relay is included in circuit with the alternate contacts of said switch elements.

I 6. 'A,,pole-changing deyice including a source of current, switching mechanism for reversing said current, an electrodnagnet for 5. A pole changing device mcludlng a moving the switching mechanism, and a polarized relay, receiving the current of raif ferent directions, -operating,"when receiving,

the -current of one direction," for including said electro-magnet in circuit to effect its energization, and, when receiving current of an other directiom-to remove said electro-mag net from'circuit.

In Witness whereof, Ihereunto subscribe my name this 30th day of April A. 1)., 1968.

HARRY O. RUG H Witnesses:

L. G. Simon, G. L. CRAGG.

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