US1795494A - Telephone system - Google Patents

Description

Mjarch 10, 1931. w. KUSCHE ET AL 1,795,494

TELEPHONE SYSTEM Filed Dec. l2. 1928 3 Sheets-Sheet 1 0 L go 00 W KUSCHE /A/l/ENTDRS R. DAHMS f:- PFLE/DERER March '10,- 1931. y w KUSCHE E1' AL 1,795,494

TELEPHONE SYSTEM Filed Dec. l2, 1928 3 Sheets-Sheet 2 F/E. 2d if W KUSCHE /NVEA/TURS H, UAH/4.5

F PFLE/DERER 5y v A T'RNE Y March 10, 1931. w, KUSCHE ET AL 1,795,494

'TELEPHONE SYSTEM Filed Dec. l2, 1928 3 Sheets-Sheet 3 Hs. .3d

Il II IIHIHIIIH W. ffl/55H5 /NVEA/m/'s DAHMS E PFLE/DERER ATTRNEY Patented Mar. 10, 1931 UNITE STATES PATENT OFFICE WALTER KUSCE-IE, OF BERLIN-GHARLOTTENBRG, RUDOLF DAI-IMS, 0F CEIARLGCTEN- BURG, AND FRITZ PFLEIDFHFF, CF RFFTTTLC'LTAF-OTTENBURG, GER-MANY, .AS- EGNQB-S TO SEEDENS & EAL-SHE AKTIENGESELLSCHAFT, OF SIEMENSSTADT, BERLIN, GERI/IANY, .A COMPANY OF GERMANY TELEPHONE SYSTEM Application led December 12, 1928, Serial No. 325,534, and in Germany December 15, 1927.

Tris invention relates to telephone systems and particularly to systems in which communication channels involving speech ampliliers or repeaters are built up by automatic switches responsive to dial impulses.

lt is an object o' this invention to render speech ainpliiiers accessible over automatically established connections commonly available to a plurality of lines of different characteristics.

A feature of the invention is a means for automatically adjusting the characteristics of the speech amplifier taken for use to the characteristics of the line. Each amplilier has associated with it an automatic switch which is set into operation upon the seizure of the amplifier and which then automatically moves into a particular position correspond ing to the line from which the connection is extended and in which position artificial networks corresponding to the characteristics of such line are appropriately connected to the amplifier.

In accordance with another feature of the invention the amplilier is properly adjusted in the manner set forth in accordance with the characteristics of both the calling and the called line.

In accordance with a further feature of the invention the calling lines are divided into groups and in each group all the lines have the same characteristics so that the amplifier is adjusted in accordance with the group from which the call originates.

The drawings consist of three sheets designated Fig. 1, Fig. 2 and Fig. 3 and when placed as indicated in Fig. 4l diagrammatically illustrate the essential features of the invention. Fig. 2a represents circuits and apparatus identical with those of Fig. 2 and Fig. Se represents circuits and apparatus identical with those of Fig. 3.

The calling lines are arranged in groups wherein each line of a group has the same characteristics as each other line of that group and the lines of one group may differ in their characteristics from the lines of other groups. In this manner switch 1 having arms 2, 8 and 4L is accessible through any well known line switch or line finder arrangement to lines of one characteristic and the switch 5 having arms 6, 7 and 8 is accessible to lines of another characteristic. Only one level of such switches is here represented, it being understood that the same or similar wiring arrangements are made in other levels, that the different levels are directively selected and that the contacts in each level are automatically selected. Y

The irst contacts of the banks of these selectors, as shown, are multipled together and extend to a secondary selective switch. ylihus the iirst contacts ot the banks traversed by arms 2 and 6 are connected together and extend to arm 9 of switch 12 and the first contacts of the banks traversed by arms 3 and 7 are connected together and extend to arm 10 of switch 12. The first contacts of the banks traversed by the corresponding testing arms 4 andl 8 are not multipled, as usual, but lead to a series of relays 13 and 14, respectively. Thus when the arm 4 is set on its iirst contact, a circuit will be completed to the win ding of relay 13, whence the circuit will extend over the normal contacts of the inner right hand armature of relay 13, the back contact and left hand armature of relay `13, the back contact and left hand armature of relay 14, theback contact and left hand armature of relay 15, the winding oi relay 16, to ground. Since a battery connection (not shown) is made over the arm 4:, relays 13 and 16 will be operated. Relay 13 will then lock through its alternate contact and inner right hand armature directly to the winding of relay 16 and the chain circuit through the left handv armatures of this series of relays will be broken. Hence, another selector, such as 5, testing its first contacts will ind a busy condition denoted by the absence of the ground connection to the Contact traversed by arm 8. As long as the selector 1 remains set on its first contacts, relay 13 individual to switchml` will remain operated in series with relay 16 which is individual to switch 12 and no other selector, such as 1 or 5, can gain access to the selector 12.

In a similar manner the second contacts of the selectors l. and 5 are multpled together and lead to a secondary selector 17, having arms 1S, 19 and 20. Likewise, the second contacts traversed by the testing, arms 4 and S are connected to a seiies of relays 21, 22 and 23 controlling a relay 24 individual to selector 17. rlhus it will be seen that a call coming in over either selector 1 or 5 will be automatically extended in the rst instance to selector 12 and the first contacts in the banks of the remaining switches of this group will be rendered busy by the breakingr of the chain circuit through relays 13, 14 and 15. Similarly, it will be noted that the next call comino; in over either of such first selectors will be automatically extended to selector 17 and thereafter the second contacts in the banks of the remaining' iii'st selectors will be rendeied busy by the breakingy of the chain circuit through the left hand armatures of relays 21, 22 and Q3.

Each of the secondary selectors 12 and 17 is shown with two levels, it being` understood, as befoi'e, that the different levels are directively selected and the contacts in the levels are automatically selected. ln the present case the first contacts in each level shown and in each switch shown are multipled 'io- Aeether and lead to a single speech amplifier. The testing contacts, however, are not multiplcd but have individual conductors extending therefrom to a. plurality of relays in a number of chain circuits, somewhat in the same manner as in connection with the first selectors. Thus when either of the secondary selectors has been directively set on either of its two levels shown and has then automatically selected its first contact, one of the relays 25 to 29 will be operated in series with relay and by opening` a chain eircuit including the outer left hand armature and back contact of one of such chain relays will prevent any other selector from approprinting` the same speech amplifier. ln a similar manner when the first contacts of the secondary selectors are passed over and a .set of second contacts are selected, then a relay within F 2a similar in all respects to one of the chain relays 25 to Q9 will be operated in series with a relay similar to relay 30 and the chain circuit controlled thereby will be opened and the second contacts traversed by arms 11 and 20 will loe marked as busy.

New by the combination of the third wire testing; relays which are operated'the characteristics of the calling;l line will be known at the speech amplifier. Let it be assumed that the secondary selector 12 has been first selected and that thereafter the conductors 3l, 'which extend to the speech amplifier shown in the upper part of Fig. 3, have been selected by settingarms 9 and 10 on their first contacts in the second level shown. This results in the energization of relay 2G and the consequent establishment of a ciralso associated with the intliis speech amplifier is a cont i having arms 51 to 56. inl character disclosed in Patent 1,215,133, granted B. VJ. Kendall. Associated with the incoming' end are a plurality of artificial n- V-lo il2 and i3 connected to the speech a .Y incr by an automatic switch le havi lo to 48, inclusive, and a stepping l ainV a stepping magnet 57. serves to extend the conductors-i 31 ncoining end of the speech amplifier a various types or attenuating netersed by arms 51 to 5l, inclusive.

Should the incomingr call have originated tlie eroup of lines served by switch 1, then accoix to our assumptions, relay 13 will be -ne K e rlllierefore, a circuit will be extended f the armature and rom ground,

fron-,t Contact of relay 1f', the armature and baci; contact of relay 58, windingt of relay 59, outer right hand armature and front contact of relay 18, front Contact and innermost armature of relay 3G, conductor 60 to the lira coi "ts traversed by arm of switch 50 and arni of switch lt.

Upon the operation of relay 30, hereinbefore described, a connection will be established from ground, interrupter G1, conductor G2, back Contact and right hand armature rela,7 33, armature 63 of relay 30, and

ont contact associated therewith, windstepping' magnet 5'? to battery and laround. [it the same time a circuit is established from ground, interruptor (il, conductor (32, back contact and left hand armature of relay front Contact and armature (i4- of relay 30, winding of stepping magnet 49, to battery and ground. Under the control f interrupter G1, both switches 44 and 50 will be stepped forward until the arms t? and 55 of these switches, respectively, reach their first contacts whereupon relays and M he connected through the or will windingof relay 59 to the ground controlled by relay 1G. Bela' 59 becomes energized and locks througijh its inner right hand armature and front contact to the ground supplied by armature of relay 1G. At the saine time a circuit is established from ground, armature and front contact of relay 16, outer right hand armature and front Contact of relay 59, winding of relayV 58 to battery and ground. Relay 56 onergizes an locks through its armature directly to "h ground supplied over the armature of relay 16. iks soon, however, as either relay 33 or 34 attracts its armature, a circuit will be eirtended from ground, the outer right hand armature and front contact of relay 26, conductor 32, normal contact and left hand armature of relay 33 or normal contact and right band armature of relay 34, andthence thro either a 55 or arm 47 to conductor 60, thereby short-circuiting relay 59 and causing it to become deenergized. Vlith relay 59 deenergized and relay 56 locked, the ground until then supplied over the outer right hand armature and front contact of relay 13 is disconnected and conductor 60 thereby freed. Tf this conductor 60 is freed before either relay 33 or 34 has complete-:l its movement, then the marking ground will be maintained by the relay which first became energized. The energization of relay 33 stops further movement of switch 50 and the energization of relay34 stops further movement of switch 44.

When both relays 33 and 34 have become energized, the ground which was extended to conductor 35 willbe disconnected and relay 36 will become deenergized, thereby preventing the possibility of an inaccurate setting of either of such switches as 44 or 50 which may bev associated with another speech amafb . plifier such as that assumed to be contained within the rectangle marked 3a.

Thus a line calling over selector 1 will require artificial network 43 to be connected to the speech amplifier and an attenuating network interposed in the line such as that connected between the first contacts of switch traversed by arms 5l, 52, 53 and 54.

Should the incoming call have originated in the group of lines served by switch 5, then relay 14 would be energized and a circuit established over the outer right hand armature and front contact of relay 14, through the associated contact and armature ofrelay 36, to conductor 65, thus marking the second contacts of switches 50 and 44. Hence, a line calling over selector 5 will require an artificial network 42 to be connected to the speech am* plifier and an H type attenuating network interposed in the line through the second contacts of switch 50.

The connection having been set up through switches 1 and 12 and thence over conductors 31 to the speech amplifier in the upper part of Fig. 3 will now extend through one of the load distributing switches 66, 67 or others,

which are indicated by the downwardly extending conductors at the bottom of Fig. 3. The particular one of these switches to be used will be determined by the level upon which the brushes of switch12 have been set.

Thus it was assumed that switch 12 was set on its second level resulting in the energization of relay 26. Switch 67 corresponds to the vsecond level of the selector 12 and switch 66 corresponds to the iirst level thereof. Therefore, a connection will `be established from ground, interruptor 61, conductor 62, back contact and armature 68 of relay 69, conductor 70, inner left hand armature and front contact of relay 26, conductor 71,4to the winding 72 of the stepping magnet controlling switch 67. The stepping magnet thereupon moves the arms 73 to 7 8, inclusive, forward step by step. Let it be assumed now that the first contacts traversed by the arma of selector 6.7 are busy. This condition will be denoted by a ground connection to the winding of relay 79, so that when arm 77 makes connection thereto, relay 69 cannot be operated. A circuit extends from ground, the armature 80 of relay 30, conductor 81, through the lower high resistance and upper low resistance winding-of relay 69 in series to arm 77. Therefore, with a ground connection to the winding of relay 79, relay 69 does not become operated and the arms of the switch 67 pass on to their next contacts. Let it be assumed that the second contacts traversed by the arms ofthis switch 67 are idle. Therefore, theV ground connection extended through the windings of relay 69 to switch arm 77 will be extended to the winding of relay 82 and thence to battery and ground. Relay 69 becomes operated and through its innermost lower armature short-circuits its i.

high resistance winding, leaving now only its low resistance winding in series with the winding of relay 82, relay 82 becoming energized. By the operation of relay 69 the circuit of stepping magnet 72 isbroken and the .switch comes to rest on its second contacts.

Through its two upper armatures and front contacts, relay 69 extends the outgoing connections from the speech amplifier to the arms and 76.

Through. the arms 73 and 74 the switch 67 now yconnects an appropriate balancing network 83 to the outgoing end of the speech amplifier and by the operation of relay 82 causes an appropriate attenuating network 1 to be interposed in the line. Thus upon the operationof relay 82 a connection is established from ground, the armature and front arm 90 whereupon relay 92 becomes operated and opening the circuit of stepping magnet 95 allows the switch 85 to come to rest whereupon an H type attenuating network is ini terposed between the speech amplifier and respectively, and thence through the contacts of relay to the talking conductors leading back to the calling line. These relays in turn control battery and ground connections to the conductors leading to the called line so that by proper manipulation of the calling line any automatic switches connected to the called line may be operated.

At the termination of the connection, switches 1 and 12 may be restored in any appropriate manner whereupon relays 13, 16, 26 and 30 will become deenergized. Upon the decnergization of relay 80, relays 33 and 84 will become deenergized and by closing their right and left hand contacts, respectively, will connect the interrupter 61 through the switch arms 56 and 48, respectively, to the stepping magnets 57 and 49, whereupon the switches and 44: will be returned to normal. In a similar manner relay 69 will become deenergized upon the deenergization of relay 26 and a connection will be extended from the interrupter 61 through the armature 68 and arm 78 to stepping magnet 72 whereupon switch 67 will be returned to normal. Upon the deenergization of relay 82, the ground will be removed from the winding ot' relay 92 and this will close a circuit for the energization of stepping magnet 95, whereupon switch will be returned to normal.

Fig. 2a represents an organization of relays similar to those shown in the upper part of Fig. 2 and Fig. 3a represents an organization of switches, speech amplifiers etc, similar to Lthat shown in the remainder of Fig. 8. It will be noted that switches 66 and 67 show multiple taps to the conductors outgoin from their different bank contacts. It will e understood that the switches in Fig. 3a, for

, instance, corresponding to switches 66 and 67, will have their Contact banks multipled to the contact banks of switches 66 and 67.

What is claimed is 1. In a telephone system, lines of diiierent f. characteristics, repeaters, automatic switches for establishing connections from said lines to said repeaters, means for adjusting said repeaters in accordance with the characteristics of said lines, and means comprising a plurality of relays commonly associated with said automatic switches for selectively operating said first means.

2. In a telephone system, lines of dii'lerent characteristics, repeaters, automatic switches for establishing connections from said lines to said repeaters, balancing and attenuating networks Jfor adjusting said repeaters in accordance with the characteristics of said lines, and means comprising a plurality of relays commonly associated with said automatic switches for selectively operating said irst means.

3. In a telephone system, lines of different characteristics, repeaters, automatic switches for establishing connections from said lines to said repeaters, means Jfor adjusting said repeaters in accordance with the character istics oit' said lines, and means comprising a chain of lock-out relays commonly associated with said automatic switches for selectively operating said first means.

4. In a telephone system, lines of ditl'ercnt characteristics, repeaters, a plurality of stages of automatic switches for establishing connections from said lines to said repeaters, means for adjusting said repeaters in accordance with the characteristics of said lines, and means comprising a chain of lock-out relays commonly associated with each said stage of automatic switches for selectively operating said first means.

In witness whereof, we hereunto subscribe our names this 111th day of November, 1928.

VALTER KUS CHE. RUDOLF DAI-IMS. FRITZ PFLEIDERER.

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