US1386688A - Telephone-exchange system - Google Patents

Description

H. P. CLAUSEN AND C. L. GOODRUM.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 5. 1919.

Patented Aug. 9,, 1921.,

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- HENRY P. CLAUSEN, OE MOUNT VERNON, AN D CHARLES L. GOODR'UM, 015 NEW Y0,

N. Y., ASSIGNORS 'IO WESTERN ELECTRIC COMPANY, OF NEW Y0, N. Y., A COR- PO'IION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Aug, 9, 1921.

Application filed June 5, 1919. Serial No. 302,031.

To all whom it may concern.

and CHARLES L.- GOODRUM, citizens of the United States, residing at Mount Vern0n,.

in the county of Westchester and State of New York, and at New York, in the county of New York and State of New York, re-

spectively, have invented certain new and useful Improvements 1n Telephone Exchange Systems, of which the followmg 1s a full, clear, concise, and exact description.

This invention relates to machine switching telephone systems, and particularly to such systems in which speclal service features are included.

The object of this invention is to provlde an arrangement whereby spec al servlce designed to expedite the work 1n a commercial otfice may be given.

A feature of the invention is the manner in which several telephone lines are multipled in the terminals. of a connector switch, the same lines arranged in several groups, the several lines appearing in a difierent order in each group.

Let us assume the case of the office of the patent department of a reat telephone manufacturing company. he attorney S has charge of a group of attorneys all working on the prosecution of ap lications relating to automatic telephony. one of the attorneys reporting to S, is working on applications dealing with power drlve systems, while another attorney H is working on applications dealing with step-by-step systems.

A party desiring general informatlon about automatic telephone systems may call S, but finds his line busy. K, however, could probably give the desired information, and it would expedite matters if he could be automatically reached under the circumstances. Furthermore, both S and K might be busy, in which case H might be able to give the desired information or at least tell the calling party that he could procure such information and would call him back. In this case it would expedite matters if H could be automatically reached. In another case, the party calling for specific information on power drive systems in calling K might find Ks line busy, but I-I might be able to help out, or in case he too is busy,

. might be able to give the desired informa- Be it known that we, HENRY P. CLAUsEN\t 1on.

In a third case, a party calling for speclfic information on step-by-step systems in calling I-I might find his line busy. It would be expedient in that case to have the call automatically directed to .S or to K in turn.

A feature of the invention is therefore the provision of means for calling any desired line of a group of lines, and in case that such line is busy, to automatically direct the call to other lines of the group leading in turn to parties next in ability to give the desired information or subordinate to the first for the particular service desired. This and other features of the invention will more fully appear in the following description and the appended claims.

Special notice is directed to the arrange ment of the called lines. The grou of called lines for the use of S, K and are connected to several groups of terminals in the connector switch in different orders. In the first Igroup they appear in the order S, K and in the second grou K, H and S, and in the third group HE S- and K. Thus, any one of the three lines may be reached by a directive setting of the connector switch. If the line thus selected is busy, the connector is arranged to automatically select one of the others.

It is not necessary that the groups of called lines be arranged as shown in the drawing, that is, all on one level, but might be widely separated, their positions depending on the numbers of the first line in each group. In the figure of the drawin a calling substation is indicated at the le t-hand side, the circuit of a trunk-hunting connector is diagrammatically shown at the center, and the multipled arrangement of three called lines with their connections to the terminals of a connector switch is shown at the righthand upper corner.

Let us assume that the calling party, as in the case assumed, wishes specificinformation on a certain question dealing with power drive automatic telephone systems, and therefore makes a call to Ks line. The calling party removes his receiver at the substation 1, whereupon he is connected in any well-known manner to the connector switch 2. Upon the seizure of this connector switch, the line relay 3 is energized and attracts its armature. A circuit is thereupon established from ground, the armature and front contact of relay 3, the armature and contact of relay 4, the winding of relay 5, to battery and ground. Relay 5 1s energized and attracts its armatures. The calling arty now manipulates lllS dial 6 to directively set the brushes 7, 8 and 9 on the terminals of Ks line. The first ser1es of impulses transmitttd by the dlal 6 conslsts of a series of interruptions in the line circuit, whereby the armature of relay 3 is yibrated. Upon each retraction thereof, a 01rcuit is completed from ground, the armature and back contact of relay 3, right-hand armature and front contact of relay 5, the side switch arm 10 and its first position contact, the primary magnet 11, to battery, and ground, whereby the prlmary magnet acts to ste the brushes 7 8 and 9 to the level in which Ks line appears. This series of impulses transmitted to the rimary magnet 11 also energizes the leftand winding of escape magnet 12, whereby it attractsits armature and retains it in this position until the end of this series of impulses. When these impulses have been all transmitted,

therelay 3 retains its armature in the actuated position and allows the escape magnet to, deenergize, the side switch wipers are passed into their second position.

The subscriber at substation 1 nowmanipulates his dial 6 to set the brushes 7, 8 and 9 on the terminals of Ks line. These terminals are shown as 13, 14 and 15. In the same manner that the primary magnet was actuated, the secondary magnet 16 is now actuated, and the'brushes 7, 8 and 9 areset on the terminals 13, 14 and 15.

We will assume that Ks line is busy. That means that a round will be found on the terminal 15, w ereupon a circuit will be completed from ground, terminal 15, brush 9, side switch wiper 17 and its second position contact,.and as soon as the armature 18 has been released, through the contact and armature 18, the left-hand winding of escape magnet 12, to battery and ground. The escape magnet 18 is arranged in the same manner as the side-switch magnet shown in the patent to Goodrum, No.

1,202,281, granted Oct. 24, 1916, in such a" manner that the armature 18 will make its contact before the escape magnet allows the side-switch wipers to pass into their next position. Hence, as soon as the armature 18 completes the circuit just described, the escape magnet will again be energized. Since the side-switch wipers are in their second position, the closure of this circuit will also close a circuit through the sideswitch wiper 10 and the secondary magnet 16, whereby the brushes 7, 8 and 9 will be stepped on to the next set of contacts. the line connected to this set of contacts is also busy, the brushes will in the same manner'be stepped on to the set of contacts 19, 20 and 21, which lead, as in the case assumed, to Ss line. Ss line being idle, no ground will be found on the contact 21, and hence upon the release of the armature 18, the escape magnet 12 will not again be energized and will cause the passage of the sideswitch wipers into their third position.

In this position, ringing current is supplied through the windings of the relay 4, the

side-switch wipers 22 and 2.3, the brushes 7 and 8, the terminals 19 and 20 to the call bell of the substation 24. Uponthe response of the called subscriber, relay 4 will be energized sufliciently to actuate its armature, which opens a short circuit over the righthand winding of magnet 12 and includes it in the circuit of relay 5. Magnet 12 will be energized in this circuit, and upon its energization will pass the side-switch wipers into their fourth position, whereupon conversation may take place.

When the calling and called subscribers replace their receiver's on their hooks, relays 3 and 25 will become deenergized, and relay 5 will, in response to the deenergization of relay 3, also become denergized. Thereupon, a circuit will be established from ground, the armature and back contact of relay 3, the right-hand armature and back contact of relay 5, the left-hand armature and back contact of relay 25, left-hand armature and contact of relay 5, right-hand armature and contact of relay 25, the primary off-normal contact 26, winding of release magnet 27, to battery and ground, which will cause the release of the connection in thewell-known manner.

Should all of the lines of the group have been busy, the brushes 7 8 and 9 would have passed to the set of busy contacts 28, 29 and 30, and the side- switch wipers 22 and 23 pass into their third position as described In this position a circuit would have been established from ground, the secondary winding of BZ, contact 28, brush 7 sideswitch wiper 22 in its third position, lefthand winding of relay 4, through a source of ringing current, and the current traveling over this path would have been suflicient'to energize the relay 4', whereby the side-switch wipers would have been passed into their fourth position as has been described. In this position the tone from the source BZ would have been transmitted to the calling substation and the subscriber there notified that all lines, over which he might get the desired information were busy, and he would thereupon hang up and release the. connection.

What is claimed is:

1. In a telephone system, line terminals,

a group of lines terminating in several groups of terminals in various orders of subordinatioma calling line, and means for extending said calling line to any one of said lines in said group and responsive to the busy condition of said line to automatically extend said calling line to the next in turn subordinate line.

2. In a selecting system, circuit terminals, a group of circuits terminating in several groups of terminals in various orders of subordination, means for selecting any one of said circuits, and means for automatically selecting a subordinate circuit if the first one selected is busy.

3. In a selecting system, circuit terminals, a group of circuits terminating in several groups of terminals in various orders of subordination, and means for selecting any one of said circuits and for thereafter automatically selecting a subordinate circuit.

In Witness whereof, We hereunto subscribe our names this 28th day of May, A. D. 1919.

HENRY P. CLAUSEN. CHARLES L. GOODRUM.

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