US1380039A - William a - Google Patents

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US1380039A
US1380039A US1380039DA US1380039A US 1380039 A US1380039 A US 1380039A US 1380039D A US1380039D A US 1380039DA US 1380039 A US1380039 A US 1380039A
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Prior art keywords
switch
line
lines
trunk
selector
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • My invention relates in general to automatic telephone systems but is concerned more particularly with such systems as include a main exchange and one or more branch or private automatic exchanges auxiliary thereto.
  • a main exchange and one or more branch or private automatic exchanges auxiliary thereto.
  • the object of my invention is to provide an improvement 'for automatic private branch exchange systcms'whereby the service at certain substations may be restricted while the serv c at other substations is unlimited; witlilvut, however: requiring difierent types of apparatus or separate groupinfl of the subscribers lines.
  • nilic groups of 100 lines each.
  • I Connector switches are provided. in each group for connecting with called lines, which connectors 'are accessible to calling lines through the medium of individual line switches arld selector switches in the usual manner.
  • the selector levels usually the tenth, may
  • the selector switches may be omitte and a combined selector and connector is used (see Fig. 2) which operates as a connector on the first nine levels and as a selector on the tenth level. all of which will be explained more in detail hereafter.
  • Th substation A may be of any approved automatic type, such, for example, as the substation shown in British patent to Martin. No. 1419 of 1910. As represented here- To accomplish the forkgoing and other.
  • automatic private branch exchange ofwhiclr the equipmentthnrein shown is a part, may have a capacity of 900 lines divided into in, it comprises essentially the receiver 2, transmitter 3, switch hook 4, ringer 5 and condenser 6. Being an automatic substation. there is also provided a pair of im' pulse springs 7 and 8 controlled by an im pulsewheel 9 through the medium of a. I
  • The. line conductors 11 and. 12 of the substation A are connected at the rivate branch exchange to the individual ine switch C which is of the general type of line switch disclosed in the British .patent to James,
  • the line switch C and a plurality of similar line switches are controlled in their trunk selecting operations by means of a master switch D.
  • the master switch D is of the general typo'of master switch disclosed in the above mentioned British pateat to James, No. 26,301 of 1906; being. however, more nearly of the particular type disclosed in the-British patent to Martin, No. -1419 of 1910, also previously referred to.
  • the function of the master switch is to maintain the plungers of all idle line switches which it controls in popition before the terminals of an idle trunk
  • One of the trunk lines to which the line switch C has access is shown in Fig. 1 extendin%to the selector switch E.
  • circuits are further modified by the addition in accordance with my invention, of a fourth conductor to the trunk line extending between the line switch and the selector switch, over'which, in certain instances which will be pointed out, a circuit is closed by which the selectorswitch is prevented from connecting with a trunk line to the main exchange.
  • the line relay 50 is accordingly energized over the loop circuit including substation A and, upon attracting its armature, closes a circuit for the slow acting release relay 51.
  • the release relay closes a holding circuit for the line switch C which may be traced from ground G by we of the working contact of armature 49 an the said armature, conductor 48, contact 35, bank spring 31, and the holding winding 17 to battery B. Since the line relay 14 is slow acting, it retains its armature to maintain the pull-in winding 18 energized until after the above holding circuit has been established.
  • a branch of the holding circuit extends by way of conductor 20 to multiple test contacts in the banks of connector switches having access to the line'of substation A whereby a ground potential on these test contacts the said line is made busy.
  • a second branch of the holding circuit extends by way of conductor 46 to the test contact in the master switch bank which is associated with the trunk line terminating in selector E, whereby the master switch D is operated in the usual manner to advance the plungers of all the remaining idle line switches of the group which it controls into position before the terminals of the next idle trunk line.
  • the engagement of bank spring 32 with contact 36 is functionless at this time, for in the case where substation A has unlimited service the terminals 38 and 39 will not be connected.
  • the veitical magnet operates to raise the switch shaft step-bystep until wipers 70, 71 and 72 arrive at the tenth horizontal level of bank contacts.
  • the '--w acting. relay 52 is energized in series th the vertical magnet and retains its armature attracted during the vertical movement of the switch.
  • the oil-normal springs 58 are closed,
  • relay 55 thereby completing aninitial energizing circuit for relay 55, which may be traced as follows: Ground at G, the working contacts of armature 49, armature of relay 52 and its working contact, junction point 80, the said oil-normal springs-5 8 and the winding of relay 55 to battery.
  • relay 55 looks itself at its lower armature independent of the relay 52 and at its upper armature prepares a circuit for the rotary magnet 54, which is ,held open ho ever during the vertical movement of the switch by the relay 52.
  • the line switchin relay 63 was connected in series with re ay 55.
  • the junction point 80 however, round as previously described. Hence it will be seen that line switching relay 63 is short circuitcd for the present and remains inoperative.
  • the rotary magnet When the slow acting relay. 52 de e'ner- 'gizes at the end of the series of impulses it completes at'its back contact the previously mentioned circuit of the rotary magnet.
  • the rotary magnet Upon energizing, the rotary magnet operates to rotate the wipers 70, 71 and-72 into engagement with the first set of bankcontacts of the tenth horizontal 'level. Near the end of its stroke, the rotary magnet breaks at its armature 73 the locking circuit of relay 55; breaks at its armature74 the cir cuit connecting the switching relay 63 with the relay 55, a. branch of which circuit extends to the rivate wiper 71; and at its armature 75,,d1sconnects the conductor 47.
  • the relay 55 breaks the circuit of the rotary magnet, which accordingly retracts its armature to close its several contacts represented herein as being controlled by the separate armatnres 73, 74, and 75.
  • the operation now depends upon whether the first trunk line, the terminals of which are now en aged by the switch wipers, is busy or not. f this trunk line is busy, the test contact 91 with which the private wiper 71 is in enga ement will ich ground potential will serve to maintain the line switching relay 63 short circuited and also to energize the relay 55.
  • the rotar ma'gnet circuit is therefore again complete and the same cycle of operations is repeated whereby,the switch wipers advance into engage ment with the next set of contacts.
  • the relay 55 will operate as an interrupter to step the switch wipers around through the medium of the-rotary contact-is reached and rotary magnet retracts its armature, the relay 55 cannot again energize and the switching relay 63 being no longer short circuited is energized in series with the relay 55.
  • the relay 63 is of such high resistance, that relay 55-remains inoperative.
  • the switch ng relay (33 opens a contact l in the circuit of the release magnet 56 to provide against the denergization of relays 50 and 51; shifts the private wiper from connection to the up or terminal of relay 63 intoconnection wit 1 holding conductor 48; and disconnects the incoming line conductors from the windings of the line relay 50 and extends them instead by way of the line wipers 70 and 72, .and the'ron- ,ductors 93 and 95 to the line relay ot' asecond selector switch at the main exchange.
  • This second selector switch has not been shown but is understood to be similar to the selector E.
  • the line and release relays of the second selector are now energized in the usual manner, whereby ground is placed upon the conductor 94 in order. to provide a holding circuit for the selector E and the line switch C.
  • This holding circuit may be traced as follows: From ground on conductor 94, bank contact 91, wiper 71 and upper armature of relay 63 and its working con-- are controlled in the usual and well known manner to extend the connection to the desired subscriber. It should be mentioned here that a repeater is usually included in each trunk line to the main exchange, thereby ermitting the use of two-conductor trun in the well understood manner. lint since my invention is confined to the branch equipment nothing would be gained by showing in detail these trunks or the selectors to which theyextend.
  • the shaft cam 85 operates to switch the rotary off-normal springs with the following results:
  • the separation of contact springs 84 the previously described circuit including conductor 47 is broken, whereby the rotation is stopped; by the separation of contact springs 82 the energization of the switching relay 63 is prevented; and finally, through the medium of contact springs 86, 87, and 88, ground G is substituted for ground G in the circuit of the line relay 5(). Since the above circuit now includes the secondary of the transformer of the busy signaling machine, the calling subscriber will be given the busy signal, and will accordingly replace his receiver.
  • Fig. 2 in order to describe briefly a modification of my invention in which the same is applied to a so called selector connector switch. It has been thought unnecessary to show all the details of this switch, consequently everything except the bare operating circuits has been omitted. At this time reference is had to ll. S. Letters Patent #1,16i,-t79, granted Dec. 14, 1915 to Gerald Deakin.
  • a selector connector is of" utility inan automatic private branch exchange of a capacity of 90 lines or less, in which case the selectors such as the selector E would be omitted andselector connectors such as the one shown in Fig. 2 substituted therefor.
  • the specific substitution mentioned would be accomplished by removing the selector E and connecting 'the conductors 100, 101, 102, and 103, respectively, of Fig. 2, to contacts 34, 35, 36, and 37, of Fig. 1.
  • a calling subscriber whether restricted service or not, who desires to connect with another local subscriber, will remove his receiver, whereupon his line switch operates to extend his line to an idle selector connector, which is then controlled in a two digit operation to connect with the wanted line.
  • the first digit to be called will be the digit 0, whereby the vertical magnet VM is controlled by the line relay K to raise the switch shaft to the tenth level.
  • the sluggish relay M is in series with the vertical magnet and is maintained energized during the series of impulses to close a cir cuit for the private magnet PM.
  • anautmnatic selo-lector switch having directivcly controlled primary. Movement for selecting groups of lines and automatic secondary move
  • an automatic switch having means for testing saidlinesand for selecting an idle one, a Second automatic--s ⁇ vltcli having access to said first switch. means For operating said switches. and a cucuit controlled from said first switch and effective. to cause said sec-. ond switch to pass over said lines while testing whether the said lines are busy or not.
  • a temporai'-il v 50 established connection including movable contacts in a first auton'iatic-switch and termina'ting in a second ,automatic switch, a
  • a temporarily 40 established connection includipg movable contacts in a'first automatic switch and terminating in a second automatic switch. a group of trunk lines. means for operatlng the said second switch to select. an idle one.
  • trunk'lines means for extending a calling line to said switch and for control ling the same to select an idle one of said trunk lines including automatic.
  • means for 5 causing said selector to pass over busy trunk lines, and a circuit closed only when the calling line is of a particular kind torcausing said selector to pass over all of said trunk lines whether busy or not.
  • a selector switch In a telephone system. a plurality of subscribers lines. a selector switch. a group oftrunk lines, means for ('nntrollil'lg said switch over a calling one of said lines to select an idle one of said trunk lines including means for causing said selector to' passover 2.
  • a group of lines In a telephone system. a group of lines.
  • trunk lines means for extending a scalling'linc to said switch and for controlling the same to select an idle one of said trunk lines including automatic means for causing said selector to pass over busy trunk lines, a circuit closed only when the c:'ll-ling.line is of a particular kind for caus- 'mg said selector to pass over all of said lrunk lines whether busy or not, aml meahs operated when all the said-trunk lines. are.
  • H. ln'a telephone system a. plurality of subscribers lines. a selector switch. a group of trunk lines. means for controlling said 'sw-itch over a calling one of said lines'to select an idle one of said trunk lines including means for causing said selector to pass over busy trunk lines. means for preventing certain-oi said subscribers lines from having access to said. trunk lines, said. means comprising a circuit closed only when one of the latter subscribers is calling and effective to cause said selector to pass over all of said trunk lilies whether busy or not. and means operated when all the said trunk lines are unselectahle for transmitting a busy signal selector. to pass over all of the lines in the selected group whet-her busy or not, and means .for preventing the closure of said circuit when a particular one of said groups is selected. n i.
  • a selector switch accessible to said lines, a plurality of groups of trunk lines.rneans for controlling said switch over a calling line to select a desired group ot trunk lines and an idle line 11'! the selected'group including means for causing said selector to pass over busy trunk' lines.
  • a trunk l1ne terminating in an automatic selector sw tch, other lines, means for operating sald switch to select an idle one of said other lines including automatic means for causing said switch to pass over busy lines, and additional automatic means, for causing sald switch to pass over all of said lines whether busy or not.
  • trunk line terminating in an automatic selector switch, other lines, means for operating said switch to select an ,idle one of said other lines including automatic means for causing sard switch to pass over busy lines, and additional means for causing said switch to pass over all of said lines whether busy or not, said last means comprising a circuit including a conductor of said trunk line.
  • subscribers lines a trunk line terminating in an autom'atic switch, an individual switch for each line responsive to a call thereover for connecting with said trunk line, means for operatingsaid first switch over a connected calling line, a circuit including a conductor of said trunk line effective when closed to limit the connecting possibilities of said first switch, said circuit normally open at two points, means in said first switch for closing said circuit at one point, and means in certain of said individual switches for closin said circuit at the other point.
  • a circuit including a con-' 'ductor of said trunk line, means in certain of said individual switches for grounding said conductor when the said trunk line is seized, and means responsive to such grounding to limit the effective operation of said first switch.
  • scribers line responsive to a call thereover i n a telephone system, subscribers lines, a trunk line terminating in an autoa selector switch, another line, means for connecting a calling line with said trunk, means for controlling said switch over a. connected calling line to establish connection with said other line,and a circuit including a conductor of said trunk line closed onl when a calling line of a particular kind is connected thereto, said circuit effective to prevent said switch from connecting with said other line and for giving a busy signal to the calling subscriber.
  • an automatic selector switch having irectively controlled primary movement for selecting groups of lines and an automatic secondary movement over the lines in a group to select an idle line in a group, means for causing the primary movement of said switch and for,
  • an automatic selector switch having a directively controlled primary movement for selecting groups of lines and an automatic secondary movement to select any idle line in a group, meansfor ,causing the primary movement of said switch and for initiating the secondary movement, and means for continuing the secondary movement whether all the lines .in the groupselectedin the primary movement are idle or not.
  • an automatic selector switch having a. d rectively controlled primary movement for selecting groups of lines, and an automatic secondary movement to select any idle line in a group,
  • an automatic selector switch having a directivelv controlled primary movement for selecting groups of lines, and an automatic se'r-ondarv movement to select any idle line in the group. llll ans for causing the primarv mova- Tnuni. of said switch and for initiafina the se ondary movement; and means for on- "said switchfto select one of said 1 lines, means for initiatin an'automaticsec- V movement Of sa d switch to; S lect, .un i le'line in theselected group of lines, 25.
  • tinumg an meansopemtiye atone time for continu all the lines selected group are'i :24.
  • eutomatic an eutomatic
  • said switch having a directiv'ely controlled fimei'y'mouement :for S81- lectin" groups o lines and an'automati'c secon ary movement to select an idle line in a. group,-means for ceusingjthe primary;
  • a. line terminating in ⁇ an autonl ti s z uiy 11 i m m s mwcvement m select groups pflineg V 'an automatic secondary movement to switch" having a directive omm ed, in

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US1380039D 1916-10-28 William a Expired - Lifetime US1380039A (en)

Applications Claiming Priority (1)

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US487308XA 1916-10-28 1916-10-28

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US1380039A true US1380039A (en) 1921-05-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566042A (en) * 1967-05-04 1971-02-23 Giorgio Pugliese Device for preventing or signalling the dialing of given telephone numbers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566042A (en) * 1967-05-04 1971-02-23 Giorgio Pugliese Device for preventing or signalling the dialing of given telephone numbers

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FR487308A (fr) 1918-06-25

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