US2397881A

US2397881A - Signaling system

Info

Publication number: US2397881A
Application number: US555799A
Authority: US
Inventors: Nitterauer Franklin David
Original assignee: American Telephone and Telegraph Co Inc
Current assignee: AT&T Corp
Priority date: 1944-09-26
Filing date: 1944-09-26
Publication date: 1946-04-02
Anticipated expiration: 1963-04-02

Description

April 2, 1946. F. D. NITTERAUER 2,397,881

SIGNALING SYSTEM Filed Sept. 26, 1944 7 Sheets-Sheet l FIG. 5

FIG.

T0 EXIT CONNECTOR CONTROL 5m. SEC77 0/V /vo. zo

IN 5 N TOR F. 0. 1w TTER4 UER ATTORNEK April 2, 1946. F. D. NITTERAUER SIGNALING SYSTEM Filed Sept. '26, 1944 7 Sheds-Sheet 2 2.8 2 N3 323228 EEQMQQES Fmohu ie 2 3:

Hg 29.8% t SE23 uvvewroa y ED. N/TTERA UER Mb ATTORNEY April 2, 1946.

F. D. N/ITTERAUER SIGNALING SYSTEM 7 Sheets-Sheet 3 Filed Sept. 26, 1944 35 2 Nu; *EE EMGE L Q Q at uuu $53 \ECGMQ l L H I ||l||||| ll 2 Q llllll e lalllllg. llll I'll. cs 0 1|i? r lNl ENTOR By ED. N/TTERAUER WQM April 1946. F. D. NI TTERAUER 2,397,881

SIGNALING SYSTEM Filed Sept. 25, 1944 7 Sheets-Sheef, 5

Y POS. KEV C/RCU/T POS- xer cmcu/ r PT INTERMEDIATE AST P051 r/o/v POS/ T/ONS SELECT PA GE t 3 E k 6 2 5 '5, Q CL INVENTOR EDJV/ TTERA UER A TTORNEK April 2,1946. F. D. NITTERAUER SIGNALING SYSTEM Filed Sept. 26, 1944 7 Sheets-Sheet lNl/E/VTOR 4 By EDJV/TTERAUEI? k"- vm MQD khvd WQQ ATTORNE V F. D.- NITTERAUER April 2, 1946:

I SIGNALING- SYSTEM Filed Sept. 26, 1944 7 Sheets+Sheet 7 .23.: 853 853 E S 3:23 3 E T83 E 2 28k P3 30 k tm INVENTOR B- EQN/TTERAUER Y mfmwg ATTORNEY Patented Apr. 2, 1946 SIGNALING SYSTEM Franklin David Nitterauer, Minneapolis, Minn.,

assignor to American Telephone and Company, a corporation of New York Telegraph Application September 26, 1944, Serial No. 555,799

20 Claims.

Thi invention relates to a combined registry and paging system of the type which is particularly suitable for use in large hospitals and similar institutions, as well as in large business establishments.

It is the object of the invention to provide an improved combined registry and paging system which furnishes complete coverage of a building, in which the system is installed, for paging purposes; which provides registry facilities for a substantially unlimited number of individualshaving roving assignments in such a building; and which simplifies the necessary controls .and reduces to a minimum the signaling, Or indicating apparatus required in identifyin and locating the various individuals covered by the system.

In accordance with a particular feature of the invention some of the normal telephone facilities with which a hospital or other large building is provided are coordinated with those of the registry and paging systems. More particularly, the usual private branch exchange switchboard is utilized as a central control and observation point from which all paging functions are preformed under control of the private branch exchange operators, or attendants, and at which all signaling equipments, which identify the various individuals covered by the system and which serve to identify the locations of such individuals at any particular time are located. To this end, each individual covered by the system is provided with a signal lamp located at the exchange with multiple appearances at each of the operators positions. The lighted condition of such lamps serves to indicate to the operators that the corresponding individuals are on the premises and have placed themselves on call. Also located at the exchange, with multiple appearances at the various operators positions, is a series of section lamp signals each one of which identifies a particular section, floor, or zone into which the premises covered by the system are divided, and

each one of which, when lighted incident to an act performed by an operator in attempting to locate a particular individual identifies the sought individual with the corresponding section, floor, or zone. g Another feature of the invention contemplates the use of a registry switch per individual, or registrant, which functions, under control of pulsing devices, such as telephone dials-located at each of the various floors, sections, or zones into which the covered building is divided, to store'information as to the whereabouts of theparticular individual while in the building The information thus stored is available to the several operators to employ at will, or as conditions require.

A further feature of the invention resides in operator-controlled means for automatically connecting a paging transmitter to the loudspeaker paging system individual to the section, floor, or zone in which a registration to be paged is located, for localized, low-level, loud-speaker paging. This feature avoids disturbing the entire building to reach an individual registrant who is moving about the building. It also simplifies the reaching of such individual in that it eliminates the necessity for the operator to first determine the location of the sought individual and to thereafter perform the paging function. The sought individual is automatically located in the section, zone, or floor to which he has advanced and the loud-speaking system of the said section, zone, or floor is automatically associated with the operators paging transmitter.

Still another feature of the invention provides for broadcast paging throughout the entire building in emergencies.

A still further feature of the invention provides for silently signaling any registrant at the conclusion of his next registration by means of a flashing lamp at the dial section from which he registers, when a delayed call or message is being held for him by the private branch exchange operator.

Still another feature of the invention provides an automatic switch per section, zone, or floor which functions in such a manner, in response to the actuation of the dial at a dial station, as to obviate the need for any auxiliary switch or mechanism which normally recognizes the removal of the telephone set or receiver from its support. In other words, a registrant in registering his location in the building need only actuate the dial in accordance with the digits of. his identificationnumber and is not required to perform any operation which simulates switchhook con tact operations normally required in the initiation of a call from a dial station.

These and other features of the invention Will be readily understood from the followin description when read in connection with the accompanying drawings, the Figures 1 to 7 of which, when arranged in accordance with the block diagram of Fig. -8, cooperate to illustrate a complete combined registry and paging system embodying the features of the invention. v

The system disclosed in the drawing is by way of illustration only, since it will be apparent that i try number is 65.

the capacityof the system is substantially unlimited. For the sake of simplification, the disclosed system is described as one which is suitable for use in covering twenty sections, floors, or zones of a building and in providing registration facili ties for one hundred individuals. I

In Fig. l-there is diagrammatically illustrated, in detail, a connector switch C820 which is individual to section N0. 20 of the building covered by the system. To the left of the connector is indicated the No. 29 section dial circuit or control station, from which the connector C820 is controlled. The section dial circuit, one of which is individual to each section, consists of one or more serially related telephone dials of standard wellknown type. The dials are of the wall-mounted type and are conveniently located in readily accessible points in the section. With .each dial there are associated two signal lamps one of which is a registry lamp and the other a busy lamp. The busy lamps, when lighted, function to indicate the busy condition of the section connector, and the registry lamp, when lighted, serves to in- .form ,a registrant employing the dial that the connector has functioned to transmit the regis- ,tration information to the registrants particular registry switch. At the top of Fig. 1 is shown a relay allotter circuit which is common to all twenty section connector switches.

At the bottomoi Fig.2 is shown a duplication of the section dial circuit and connector switch shown in- Fig. i. This equipment is intended to illustrate such equipment as is individual to section No. 1 of the building. The upper portion of Fig. 1 shows, in block form, corresponding equipment allocated to sections Nos. 2 to 19, inclusive, of the building.

keys 60 and GI, respectively. One such key is provided for each lamp such as 49 and 5|. Similar keys are illustrated in Fig. 3.

At the first switchboard position there are located one key 44 per registrant, that is, one

such key for each registrant's lamp, such as A9. A similar key is shown in Fig. 3, corresponding to the registrants lamp I49.

The lamps 9i and 90 of Fig. 4, one of which is 'providedfor each section at each switchboard position, are page busy lamps. These lamps are,

i in the drawings, particularly identified with sec- Fig. 3 shows two registrants registry switches,

one in detail and the other schematically, and

also the signals and control equipment located at the exchange [and individually corresponding to the registry switch shown at the top of Fig. 3.

The upper portion of Fig. 4 shows, in detail, a

scriptive purposes is assumed to be individually assigned to the individual doctonnurse, clinician,

arcs are multipled to corresponding arcs of other registry switches, and also how other are contacts extend to the various lamp signals and conregistrants registry switch RS65, which, for 'detrol keys located at theprivate branch exchange.

The right central and lower portions of Fig. 4'

illustrate aportion of the switchboard equipment.

In this partial showing, the lamps 49 and 5!, located at each of two switchboard positions are allocated to. one particular registrant, such 'as registrant No. 65. If, as assumed, the illustrated system accommodates but one hundred registrants, there would be one hundred such lamps located. at each operators position. Since the lead 50 over which the lamps 49 and 5t are controlled is shown connected to registry switch RSS5, it follows that these lamps identify regis- .trant No. 65 to whom the switch RS65 .ls individual. Corresponding lamps Hi9 and 15! of Fig.

3 are identified with the registry switch shown at the top of the figure, being associated therewith bythe conductor 158. The .lamps- I49 and i5! would therefore identify the individual to whom that particular registry switch is assigned.

Just below the lamps 49 and 5| are shown the tion No. 20 of the building, whereas corresponding lamps I04 and ")5 are particularly identified with section No. 1. Obviously, in a twenty-section building there will be twenty such lamps at each opera-tors position. Each such lamp is associated with a corresponding page key, such as shown at HH and I02, for example.

The lamps 63 and 64, also 65 and 55, are section lamps. The lamps. 63 and 64, one each of which is located at an operators position, identify section No. 20, whereas lamps 65 and t6 serve in the same capacitywith respect to section No. 1. 0bviously, there will be twenty such section lamps at each operators position.

Figs. 5, .6 and 7 when placed one below the other in that order, constitute a diagrammatic representation of the position key circuit located at each operators position, and the group selecting paging equipment associated therewith. By virtue of the relay arrangement shown in Figs. 6 and '7 and in the lower portion of Fig. 5, each operator has automatic access to twenty section loud-speaker systems, three of which are shown schematically at the right of Fig. '7. It'is to be understood that each cut through relay such as relays 11, 18 and 79 (one per position) controls twenty page control relays, only three of which, 80, 8| and B2 are illustrated. Similarly, each of the twenty page control relays, such as ac, Bl and'82, one per position, control a section control relay such, for example, as relay 93.

This brief description of the figures when coupled with the following detailed, description of tion when such registrant registers from sections Nos. 1 and 20 of the building.

Registration When a registrant, such as a doctor, clinician, or other key personnel member enters thehospital he, or she, to whom a'particular identification has been assigned, will, in accordance with hospital regulations, proceedjto a convenient control or dial station and dial his, or her. assigned identification or registry number. Such entrance dial stations would be located usually in the hospital lobby or other convenient locations to which such individuals would normally go upon arriving at the hospital.

It will be assumed that the registrant has been assigned the number 65. and that thedial D at section No. 1 is employed for registration purposes, this dial being one of two illustrated at the lower left corner of Fig; 2 which are located in the hospital lobby, or at someconvenient place near the entrance.

"When the section dial D is moved oii normal,

connector relay l'fl'operates in a circuit extend-' lay I8, normally closed dialing contacts I2 of dial D", normally closed dialing contacts I3 of dial D, lower winding of relay Iii, conductor I4, off-normal contacts I4of dial D, conductor I5 to ground. Relay I5, which is slow-to-release, now operates in a circuit extending from grounded battery, winding of relay I5, strapped terminals of timing switch TS, front contact and armature of relay Ill to ground.

When the section dial is released, the pulsing" contacts I3 of the dial D are alternately opened and closed in accordance with the first digit 6 of the identification number 65 assigned to the dialing registrant. Relay I follows these interruptions, releasing and operating six times. Relay I 5, being slow-to-release, remains operated during these repeated operations of relay I0.

Each time relay I0 releases, ground at its back contact is extended to battery and ground by way of the lower armature and front contact of relay l5, contacts I! of the vertical off-normal switch VON, winding of'siow-to-release relay I8 andthe winding of vertical magnet I9. -Magnet I9 operates in a well-known manner to cause the connector switch CSI to rise one step each time relay Iii releases. Relay I8 also operates in the circuit traced and maintains the pulsing circuit through its armature and front contact and contacts 25 of vertical off-normal switch VON after the contacts I! thereof were opened at the first vertical movement of the switch shaft. Thus, in response to the dialing of the first digit 6 the connector switch CSI is raised so that its

wipers

33 and 39 are located opposite the sixth level of contacts. I

At the end of the first series of impulses, slowto-release relay I8 releases to transfer the pulsing circuit to the rotary magnet 2| through the winding of slow-to-release relay 22, In response to the second series of five pulses transmitted by the dial D the rotary magnet 2| rotates the connector switch shaft five steps at which time the switch wipers will be in engagement with the

terminals

34 and 45 which'correspond to the registry switch RSS which is individually allocated to the registrant whose identification number is 65. Relay 22 operates in the pulsing circuit and remains operated during the rotary pulses.

When the rotary pulses cease, relay 22 releases and at its outer armature and back contact extends ground over the contacts 23 of rotary oiT- normal switch RON, conductor 24, upper armature and back contact of relay 25, to the allotter start lead 26, winding of relay 2'! individual to the first connector served by the relay allotter, to battery and ground by way of the upper normally closed back contacts of all other allotter relays, such as

relays

28 and 29.. Relay 27 Operates in this circuit and locks. At its lower armature, relay 27 connects ground to the lead 3| to cause relay 353 of the connector CSI tooperate in an obvious circuit, It will be observed that with relay of the allotter circuit operated no other connector relay other than relay 30 can be operated since the operating circuits for such other relays is opened at the back contact and lower armature of relay 2?.

Relay 3!), operated, connects battery by way of its middle armature and front contact to the connector brush 33, and thence over the connector terminal 34 upon which the brush 33 is now rest ing, conductor 35,winding of stepping magnet 36 and its interrupter contact, brush T of the registry switch R855 and its corresponding No. 1 terminal (assuming switch RSS5 is already resting on terminal No. 1)., conductor 31, to-the uppermost armature of relay 30. It will be observed that all terminals of the are of switch R65 associated with the brush T are directly grounded except the No. 1 terminal since the direct ground has been removed from this terminal by the operation of relay 30 in the connector CSI. Step- .ping magnet accordingly operates to step the switch RS65 around until the wiper T thereof engages the No. 1 terminal from which direct ground has been removed. With relay 30 operated and when the switch wiper T engages the No. 1 terminal, ground through the winding of relay 25 is substituted for the direct ground at the uppermost back contact of relay 30 so that relay 25 operates to battery at the middle front contactof relay 30 over the circuit previously traced. The winding of stepping magnet 38 is included in this circuit but this magnet does not operate in series with relay 25 due to the resistance of the winding of this latter relay. The registry switch RSS5 accordingly comes to rest on its No. 1 terminal.

Relay 25, operated, 1ocks in a circuit extending from battery, outermost upper armature of relay I 6, contacts 38 of vertical off-normal switch VON, inner lower armature and front contact oi'relay 25 and its winding to ground; At its upper armature relay 25 opens the allotter lead 26, and at its outer lower armature it closes the lead from connector brush 39 through to the dial section lamp 40 by way of conductor 41,. With the allotter lead 26 opened incident to the operation of relay 25, allotter relay 2'! is released causing'the release of connector relay 30. Thus some other connector relay, 35, 30' is permitted to operate if a registration by way of such other connector has been initiated.

The dial section lamp 40 is now lighted in a circuit extending from the alternating current supply 4! (Fig. 4), conductor 42, contacts 43 of the ke 44, conductor 45, connector terminal 45 and brush 39, front contact and outermost lower armature of relay 25, conductor 41, filaments'of lamps 40 and 48 in parallel, conductor I5, to ground. Both lamps 4D and 48 are lighted in this circuit, the former indicating to the registrant that his presence in the building ha been registered at the attendants display board since registry lamp 49, individual to the registrant is lighted also from the source M, over conductor 42, contacts 43 of the ke 44, conductor 45, brush SR and corresponding terminal No. l of registry switch R865, conductor 5&, to ground through the filament of lamp 4e. Lamp 5!; located at anotherposition of the switchboard is lighted in parallel with lamp 49. It will be observed that the 'arc terminals of switch RSS5 associated with the brush SR are strapped together so that no matter what position the switch takes, the lamps 49 and SI and any other corresponding lamps located at other attendants positions will remainv lighted until the registrant leaves the hospital, as will appear more fully from a later description. v

It will be observed also that when the connector relay I6 operated, it completed an obvious circuit for the energization of the busy lamps 52 and 53 of the section dial circuit to indicate the busy condition thereof and to thereby guard against the use of dial D" by another registrant while the dial D of the same section is in use.

Relay 30, which released when relay 25 operated, makes the relay allotter AS available for use by other section switches and regroundsthe rant it.

Timing The length of time a registrant, such as registrant No. 65, may hold up a section switch, such as the connectorCSl, is'limited to several secondsiand ma be varied by the strapping of the contacts of the timing switch TS. As long as relay i6 is operated, interrupted ground, by way :of interrupter 54, is connected to the stepping magnet 55 for the timing switch- TS by way of the front contact and third upper armature of caused to step once per second, theinterrupter 54 functioning at 60 interruptions per minute, towards the unstrapped contacts of the timing switch TS. If the various subsequent regis'tration operations, just described, are not accom- 1 plished in the allotted time, the timing switch upon leaving the last strappedcontact will open the circuit to relay 16 to release the switch CSI Normal timing on :a registration begins with the first off-normal movement of the dial and continues until the beginning 01 the pulses of the last (rotary) digit which operate relay 22 as previously described.

. relay l6 :atnd the back contact and outer armature of relay 56. Thus the timing switch is lead3l extending to the No. 71' contact of the bank terminals of switch RSS5 associated with the 7 brush T to prevent other registry switches from stopping on its corresponding terminal.

Registration another section is directed to the registration by the-same registrant, whose identification number is "65, from another ection. It will be assumed that the registrant has entered section No. and employs the dial D20 for the purpose of registering his location. It is immaterial whether the registrant has registered previously from some intermediate section or goes directly from theentrance section to section No. 20. To simplify the description, the elements of the section connector switch C826 and the corresponding dial circuit are given the same identification characters as corresponding elements of the switch CS with a prime characteristic added. 'It is deemed unnecessary to describe in detail the variou switching functions of the connector C520 since they are identical to those of connector CSI, previously described.

When the registrant actuates the dial D20 in accordance with the digits of his identification number 6 theconnector CS2!) functions in a manner now clearly understood to effect the seizure of the particular .registrants registry switch R565 by causing the brushes 39' and 33' to engage the terminals 46'. and 34, respectively. It will be observed that all the section terminals of the are associated with the brush T of registry switch RSS5 have direct ground applied thereto by virtue of the fact that all connectorrelays, such a 36 of the other connectors are in their normal positions. However, contact No.20 there- ,of, which is individual tothe connector C526 and ,isconnected thereto by the conductor 31', will With relay 22 operated as previously described, 1

ground is connected to battery through the upper winding of relay 56 to cause this relay to operate. Relay 56, operated, opens the operating circuit of the timing switch stepping magnet 55, and,

at its inner armature, completes an operating circuit for thetiming switch release magnet 51 byway of the rotar ofi-normal contacts RONTS of the timing switch. The release magnet 51 functions in the well-known manner to return the timing switch to normal. Relays 22 and 56 release after the completion of rotary pulsing and timing begins again. 7 V

When the connector switch CSI .is'seized by the allotter AS as described, relay operates, and, at its front contact and innermost armature, completes an obvious operating circuit for relay 56 causing this relay to function to again release the timing switch. After a short interval, relay releases, releasing relay 56 and the last period Of timing begins. Thi period is long enough to maintain the lamps 40 and 48 at the section dials for a short interval before the switch is released.

Restoration of section connector When relay I6 is released by the timing switch reaching an unstrapped contact, ground is disconnected from the lower winding of relay 16,

release magnet 59 operate in this circuit and return the switch and all operated relays o 7 normal.

be grounded through the winding of relay 25 since relay '36 of the switch CS26 is now operated. Thus, when the brush 33 engages terminal 34' a circuit is completed extending from grounded' battery, front contact and middle armature of relay 36., connector brush 33 and the terminal 34', conductor 35', conductor 35, winding of stepping magnet 36 and its interrupter-contact and brush T of the registry switch R865 which is rest- .ing upon the No. 1 contact due to the previous brush T, under the action of stepping magnet 36 is advanced step-by-step over all such contacts until the No. 20 contact is reached and, finding no direct ground on this terminal, the switch R865 comes to rest.

It will be noted that lamps '49 and 5 i individual to registrant No. 65, are maintained lighted at the switchboard over thestrapped contacts of the switch are associated with the brush SR. Also that the circuit for lamps 48' and 46' at the section dial circuit No. 20 is completed from the source 4| when relay 25' operated incident to the operation of relay 36, so that thelamps 48' and 40' serve the same purpose in the No. 20 section dial circuit as did lamps 48 and 46 of the No. 1

' section dial circuit. For illustrative purposes only, the allotter relay 28 is indicated'as being individual to the connector C820, so that this Locating registrant It will now be assumed that subsequent to the registration of the registrant No. 65 from section No. 20 it becomes necessary for an operator to locate such registrant. To this end, the operator seeking to locate the registrant actuates the key at her position which corresponds to the lighted lamp 49, for example, which is individually assigned to the registrant whose identification numher is 65. Accordingly, the key 60 is actuated since this key corresponds to the lamp 49. If the operator at the next position was seeking to locate registrant No. 65, she would actuate key 6! since this key corresponds to the lighted lamp 5| which identifies registrant No. 65 at her position.

When the key 60 is actuated, ground is connected to the brush S of the registry switch RSS5 which is now standing on the No. contact, having advanced thereto under the action of stepping magnet 36 when the registrant last registered from section No. 20. This ground is extended over conductor 62 to battery through the filaments of section lamps 63 and 64 located at each operators position, respectively, at the switchboard. The lamps 63 and 64 identify section No. 20 of the hospital, and their illumination, following the actuation of a key such as key 60, or key 6! individually corresponding to the lighted lamps 49, or 5|, which identify the particular registrant No. 65, informs th operator that registrant No. 65 has last registered from section No. 20 and may be located in that section.

Had it been necessary for an operator to locate registrant No. 65 at a time when the registrant had last registered in section No. 1, the operation of key 60, for example, would have resulted in the lighting of lamps 65 and 66 at the two operators positions, which lamps identify section No. 1, and their illumination would indicate to the operator that registrant No. 65 had last registered from section No. l. The display keys, such as 60 and GI are non-locking and the section lamps are extinguished when the keys are released.

Loud-speaker pagingautomatic selection When a registrant must be reached immediately, an operator at position No. 1, for example (Fig. 5), would first operate key 70 to the left, or select position and thereafter operate a display key corresponding to the registrant who is to '1 I, at the position at which the selection is made does not operate due to the fact that its winding is shunted by the ground at its innermost lower armature and back contact. With relays l2 and I3 operated, and relay ll unoperated, the guard lamp 7.4 at the position making the selection is lighted in a circuit which includes the back contact and inner upper armature of relay H and the outer upper armatures and front contacts of relays I2 and 13. At the other positions the busy signal lamps I5 and 16 are lighted over obvious circuits.

Relay Tl now operates in a circuit extending from grounded battery, winding of relay Tl, middle armature and back contact of relay ll (unoperated) and the front contacts and outermost lower armatures of the operated position relays 12 and 13. It will be noted that only one relay 11, 18 or E9 can be operated at a time. Belay Il, operated, prepares an operating circuit for each of the page control relays 80,-8! and 82 associated with the paging channel PC of the selecting position.

When the operator at position No. 1, for example, now operates the display key 60 associated with the lighted registry lamp corresponding to the registrant No. 65 who is to be paged,

a particular page control relay 86, 81, 82, etc.,

associated with her position paging channel PC operates. In this case, page control relay 89 operates in a circuit whichmay be traced from grounded battery, winding and normally closed make-before-break contacts of relay'80, conductor 83, front contact andinn'ermost armature of relay l1, conductor 84, inner upper armatures and back contacts of relays 85, 86 and in series, conductor 81, the No. 20 contact of the arc of switch RSS5 associated with the brush P, brush P, to ground at the lower contacts of the operated display key 60. The chain arrangement of relays 85, 86 and 80 prevents double connections by the operators.

Relay 80, operated, locks to ground at the contacts of release key 89 by Way of conductor 88. At its outer upper armature, relay Bil establishes an obvious energizing circuit for the section busy page lamps 90 and SI which lamps, when lighted, indicate to all operators that the section to which these lamps correspond is now being used for paging. At its middle lower armature-and front contact relay 80 completes an obvious circuit for lamp 92 which lights to indicate to the selecting operator that her individual paging channel is connected to section No. 20. At its outermost lower armature and front contact, relay 80 completes an obvious operating circuit for section channel relay 93 which is associated with the paging channel PX extending to section No.20.

Relay 93, operated, removes the compensating resistance 94 from the paging channel PC of the "selecting position and transfers the section No. 20 loud-speaker system from the emergency broadcast channel EBC to the selecting operators position paging channel PC. The selecting operator then operates key Iii to the right, or to the page position, thereby onnecting the paging transmitter equipment PT to the paging channel PC byway of normal contacts of the emergency key 95. The selecting operatormay now orally page the registrant, such as registrant No. 65, by talking into the transmitter associated with the transmitter paging circuit PT. The paging pronouncement maybe of any suitable nature such, for example, as Dr. Jones 221 which would indicate to Dr. Jones that he is requested to contact the party located at a telephone the number of which is 221. The paged doctor would then proceed to the nearest telephone and dial the number 221 to connect himself with the calling party. The nature of the pronouncement would, Oi course, depend upon the circumstances which necessitated the paging ofthe registrant.

When, the key 10 wasoperatedto the; right, or paging position, the circuit for. selection relays l2 and 13 is opened and these relays release. The operating circuit for relay I! is thus opened and this relay releases. With relays H, 12 and 13 in their normal conditions, the guardilamp.

M at the selecting, position is extinguished as are also the selection busylamps l andv It at the other positions. The selection grouping circuit, is now available foruse by other operators.

The page key, operated, connects the operators transmitter directly across the paging channel PC, as above described, in parallel withv a balanced retardcoil, battery and groundsupply circuit I00. All sound within the pick-up range of theoperators transmitter will be heard over the particular section loud-speaker system such, .as, in the case described, the; section No. 20 loudby making section No. 20 available for use byother operators for paging purposes.

Manuai selection registrant is to be pagedit is o nly necessary for her to actuate a manual page key, such as. key

l0! associated with the lamp 9| which identifies the known section (section No. 20,). p This key operation completes the same functions described in connection with automatic selection but will;

Actuating.

by-pass the registry switch RS235, other keyssuch, for example, askey I02 will connect other sectionpaging systems, such, for example, as the No. 1 section paging system, ior

simultaneous. paging in more than one section.

'Thus, actuation of manualpage keys I01 and I02, for example, will set upthe circuits ion simultaneous paging in sections Nos. 20 and 1.

Emergency broadcast paging Should an emergency arise wherein an "operator wishes to page in all sections simultaneously,

shemay operate her page key to the paging;

position and then 'actuatethe emergency key 9.5. operation of thee'mergency key causes the lighting or busy lampszl flii at alloperators positions, and connects the position transmitter to the It will bcrecalledfthat when a registrant'dials. from any dial stationin registering his location.

' ,=ily from the alternating current source M. The

circuit in which. such lamps lighted included the inner key contact such as or associated with the key 44. In the event that it. is desirable to advise a registrant thatthe operatorhas a. message for him, the operator at position. No. 1; would actuate the key, such as key 44, associated with the particular registrants lamp for example, to effectively insert the interrupter- 195 inithe lamp circuit; Thus, when the particular registrant dials from. any section dial station the" registry lamp thereat, such as lamps 40 and 48; or:

40," and 40' would be operated intermittently, in-

, stead of steadily. Observing, the flashing lamp,

If an operator knows the section in which a,

emergency broadcast channel BBC and. to all section paging systems. which are; not in use by other operators. The circuits in use are indie cated by the common page busy lamps, such as lamps 9|; and- 104, for example. The emergency channel EEC entersthe; switchboard at position No. l and is chained through a series of contactson the emergency keysof the other positions,

and terminates in a compensating resistance I05 in the last switc l'iboard position. The series ar rangement prevents the'u'se of, this channel by more than one operator at a 'time.

Silent paying 0 registrants When an operator has, received a'message for a registrant which is not of an emergency nature and does not require the 're'gistrantto be paged immediately, or i'fl'an operator has pagoda registrant without success she may take steps to page the registrant silently in the following manner:

the registrant would recognize that a message is being held for him at the switchboard and he would proceed to contact theswitchboard opera,-

tor. over the normal telephone facilities;

V Registrantregzstcrs out It. will be observed that the twenty-first terminal of the registry switch RS65','and of ali other similar switches .iliu'stra'ted, is marked Exit. When a registrant leaves the building he would dial his identification number from the exit control station which resultsinhisparticular registry switch, for example, registryswitch RS be ing advanced to the twenty-first terminal and coming to rest-thereon. The strapping of the terminals of the switchers associated with the brush SR ends with terminal No. 2'0, so that when the switch reaches the twenty-first terminal the circuit to the registry lampssuch as 49 and at of switch RS55 is opened and" such lamps are thenextinguished, indicating to the operator that the particular registrant, such as registrant No. 65, for example. has left thebuilding and is no longer available. I

thefexit station is the last station from which a registrant would register, the relay 2'9 of 'th'e'allotter A'S would be individual to the con nector controlled from the exit station.

If it should be desirable to provide more than one connector for a section, theuppermost armatures of all connector relays, such as relays!) of connector CSI, would. be connected together in chain fashion with ground potential associated only-with the corresponding back contact oi? the last. connector relay. This alternative arrangement is schematical ly indicated at the lower portron- 0f Fig. 2.. r

is claimed is:

1. In a combined indicating and paging system for use in-a multi-section area for the purpose of indicating the location of a plurality of persons who may be located in any section of the said area and for'pag i ng such persons, a" loudspeaker system for each section oisaid area, a control station ineacn section or saidarea, a central station, a transmitter at said central stati'on, means cont-rolled the control stationof any section for seiectiveiy preparing the-corresponding section loudspeaker system for conmotion to saidtransmitter, and switching means at said central station i-or completing the connection of the selected loud-speaker system to the said transmitter.

"2. In a combined indicating and paging systern for use in a muiti section area for the purposeoiindicating the location of a person who may be located in any section of the said area and for paging such person, said person being assigned a predetermined call number, a loudspeaker system for each section of said area, a control station in each section of said area and equipped with means for transmitting the said call number, a central station, a transmitter at said central station, means responsive to the operation of said transmitting means at any of said control stations in accordance with the said call number for preparing the loud-speaker system of the section at which the said transmitting means is operated for connection to said transmitter, and means at said central station including a switching device individually corresponding to the said person for completing the connection of the said section loud-speaker system to said transmitter.

3. In a combined indicating and paging system for use in a multi-section area for the purpose of indicating the location of a plurality of persons who may be located in any section of the said area and for paging such persons, each of said persons being assigned a. different call number, a central station, a display board thereatin- ,cluding indicators identifying each of the persons who may be paged over said system, a key individually corresponding to each of said indicators, a transmitter at said central station, a icud-speaker system for each section of said area, a control station at each section of said area including means for transmitting the said call numbers, means responsive to the operation of the transmitting means at any of said sectioncontrol stations in accordance with the call number of any of the said persons for operating the indicator at said central station corresponding to the person whose call number is transmitted and for rendering the corresponding key effective to prepare the loud-speaker system of the section from which the call number is transmitted for connection to said transmitter, and means at said control station including the said corresponding key for completing the connection of the said section loud-speaker system to said transmitter.

4. In a combined indicating and paging system for use in a multi-section area for the purpose of indicating the location of a person who may be located in any section of the said area and for paging such person, said person having a predetermined call number, a central station, a display board thereat including anindicator individually corresponding to the said person, a key corresponding to said indicator, a transmitter at said central station, a loud-speaker system for each section of said area, a control station at each section of said area including means for transmitting the call number of said person, m ans responsive to the operation of the said transmitting means at any of said section control stations in accordance with the call number of said person for operating said indicator and for simultaneously rendering said key effective to prepare the loud-speaker system of the section from which the call number is transmitted for connection to said transmitter, and means at said central station including said key for completing the connection of the said section loudspeaker system to said transmitter.

5. The combined indicating and paging system defined in the preceding claim and in which signaling means are provided at said central station for indicating to which loud-speaker system the said transmitter is connected; i

may be located in any section of the said area and, for paging such person, said person having a predetermined call number, a central station, a display boardthereat including anindicator indiwdually corresponding to said person, a key correspondingto said indicator, a multi-position switch individual to said person and having a position corresponding to each section of said area, a control station at each section of said area in cluding means for transmitting the call number of said person, a loud-speaker system for each section of said area, a transmitterat said central station, a selector switch for each section of said area, means responsive to the operation of the said transmitting means at any of said section control stations in accordance with the call numtion at which said transmitting means is operated for preparing the corresponding section loud-speaker system for connection to said transmitter, and means at said central station 'for completing the connection of the said, section loud-speaker system to said transmitter.

'7. In a combined indicating and paging system for use in a multi-section area for the purpose of selectively paging in any section of the said area persons who may be paged over said system, a loud-speaker system individual to "each section of said area, a central station, an operators position thereat equipped with a paging transmitter, a paging channel for said operators position, separate means for connecting each of said loudspeaker systems to said paging channel, means at said operators position for preparing an operating circuit for all of said separate connecting means,a control station at each section of said area, means controlled from any of said control stations'for further preparing an operating circuit for the separate connecting means of the loud-speaker system corresponding to the section from which said last-mentioned means is controlled, and means at saidcentral station for completing the operating circuit for the said separate connecting means whereby the paging transmitter of said operators position is extended to the loud-speaker system of the section from which said further preparing means is controlled, by way of said paging channel.

8. In a combined indicating and paging system for use in a multi-section area for the purconnected to. the loud-speaker system corresponding to the section'from which said prese- -6. In acombined, indicating and paging sysinechanneh.

95in: a. combinedxindicating Paging: r

J tom; for useia muitiesection areaa...ficn::the1pnr pose of.v selectivelypaging in section or said.

areapersons who 'maybepaigedoversaid system,

area, a central station, a control station foit'each section of said area,.a;pagrng transmitter: atrsaid central: station, means. controlled from. the con:- 1 trol station at; one: of saidsections for prespeaker system to. said? paging; transmitter.

a loud-speakeir' for each section; or

HLThecombined. indicating: and; paging systern defined; in the. preceding: claim; visual signalingmeansat; said: central. station on crates to identify the. loud-speaker system to said pagingvtransmitter is'connected.

11; In aisystem for indicating.- thelccation ora plurality of; persons: who may be locatediinany 1 sectionor. amulti-sectiorr area and who; are each; assigned a different predeterminedi call numbers aicentralstation, adisplay board thereatinclud I 1 ing a signaldevicefor-eachpf; saidi persons anda,

signal. device. for eaclrsection of said; multi-secqtion area, a controlzstationas eaclrsectiorr or area. and each equipped: with: means for trans.-

mitting' said call numbers, meaneresponsiv'etn the operation of thetransmittingmeansiataparwith the call number of a particular one or said persons. for operating the signal: device correspending to the said: particular person and" for 1 simultaneously preparing an operating circuit for the signal'device corresponding to the'sectionstations is located, andmeansat said central station operable to automatically complete the device. 7

12.. In a system for indicating thelocation of a person who may be located in; any section of a multi-section area and which person is assignal device. identifying each of the sections .of' said area, a control station at each of saidisections, a switching device individual to said'per- 1 son and having settings individually'corresponding to each of said'secti-ons means at any or said control stations operable ina mannerind-icative of the 'call number assigned-to said person for advancing said switchingdevice to asetti'ng cor responding to the section in which the said person is located, wherebyanoperating circuit for said first signalideviceiscompleted-airman open-- ating: circuit. for. the: second signal. device corresponding to: the:sectiorr in: person.

is located isprepared, and means atisaidcentral stationwindividualtothesaid person-ioncompleting the operating oi-rcui-tiorthesaid: second signal device.

= ticular one of said: control: stations: in accordance at'w-hich the said particular-one of control operating circuit for-saidlast-mentionedsignal 13. In a system for. indi ting-the; location ot. a

plurality of persons who may helocated inanysection of. a-.multi.-section areaanct who: are

assigned a diflerent. predetermincdcall number...

ahcentral station, a. display hoard. thereat. ine.

8 cancer lectine: means; is controlled; by was new pag of sccond signald i eachd nt fyine ar I ticular section of said area, acontroll station atmeans ata particular control station in a manner indicative o-ithe call number of a particular one or? said persons-tor causing the switching device assignedtothesaid particular person to advance to a setting'ccrresponding to the section at which the-said particular control station is located;

means effective upon the-arrival of said switching device at the said'setting for simultaneously operating the first signal device corresponding to the said particular person andp-reparing an operating circuit for the second signal device corre sponding tothesection at which the said particular' control stationis located; and means at said central station" for completing the operating circuit forthe said second signal device.

14; In a system-for indicating the location of a tion, and. means at said central station individually'corresponding to said person for automaticallyoperating'the signaldevice corresponding to the. section from which said signal device was prepared. for operation.

In a system for indicating the location of persons who may be located: in any section of a multi-section area and whichincludes control stations individual to said sections, a central station a display unit thereat including a signal.

device individual to each section ofthe. multisection area, means individual to each of" said personscontrollable'irom any ofsaid control statlOIISjfOI preparing the signal'devices individual to the sections. in. which the control stations, are locatedlfor operation, andmean's at said central. station individually corresponding to each of saidpersonsffor automatically causing, the operationof; the signal devices corresponding, to they sectionsjfrom which saidisignal devices Wereprepared,.,fo1:v operation, v r

16... In at system. for indicating the locationv of. apersonwho. maybe located. in any section of. a multi-section. area and. which includes. control.

stations. individual. to. said. sections, a. central sta-- tion; a display unit thereat. including, a, signal device. individual to each section. of.-. themultisection; area,v astepping switch individual to. said perscnandhaving a position thereof correspond-- ing, to each or said. sections, means at each. oi

said.- control stations. ior causingrsaid. stepping switch to, advance to a position corresponding to the section inwhich thescontrol station employed is. locatedand. tothereby prepare an operating; circuit for the: corresponding section signal; device at said; central station,v and; means at said central station individual-1y, corresponding to said. person-forrcompleting theoperating'circuitiorsaid.

sectionsi'gnaldevice;

17'. In a. system for indicating; the location or.

persons who may be located in any section of a multi-section area and which includes control stations individual to said sections, a central station, a display unit thereat including a signal device individual to each section of the multi-section area, a stepping switch individual to each of said persons and each having positions corresponding individually to said sections, means at each of said control stations operable by any of said persons for advancing his corresponding stepping switch to a position corresponding to the section in which the control station employed is located, means effective upon the arrival of the said switch to a particular positon for preparing an operating circuit for the signal device at said central station corresponding to the section identified by the position to which said switch is advanced, and means at said central station individually corresponding to each of said persons for completing the operating circuit for said signal device.

18. In a system for indicating the location of a person who may be located in any section of a multi-section area and which includes control stations individual to said sections, a central station, a display unit thereat including a signal device individual to each section of the multi-section area, a stepping switch individual to said person and having positions corresponding individually to each of said sections, an automatic switch for each of said sections, means at each of said control stations for seizing the corresponding section automatic switch and for directively controlling said switch to cause it to selectively seize said stepping switch and to advance it to a position corresponding to the section at which the control station employed is located, means effective when said stepping switch is advanced to any of its positions for preparing an operating circuit for the signal device corresponding to the section position to which said stepping switch is advanced, and manually operable means at said central station individually corresponding to said person for completing the operating circuit of the signal device corresponding to the section position to which said stepping switch is advanced.

19. In a system for indicating the location of persons who may be located in any section of a multi-section area and which includes control stations individual to said sections, a central station, a display unit thereat including a, signal device individually corresponding to each of said sections, a selector switch for each of said seetions, a registry switch for each of said persons and each having positions corresponding to each of said sections, means at each of said control stations for selectively operating the selector switches of the corresponding section to cause it to selectively seize said registry switches and to advance said registry switches each to a position corresponding to the section at which the control stations from which said selector switches are operated are located, means controlled by each of said registry switches when advanced to a position corresponding to the section from which said selector switches were operated for preparing operating circuits for corresponding ones of said signal devices, and switching means at said central station corresponding individually to each of said persons for completing the circuits to said signal devices.

20. In a registry system for use in a multi-section area for the purpose of indicating the location of a person who may be located in any section of said area, said person having a predetermined call number, a central station, a control station at each section of said area, a signal at said control station corresponding to said person, a signal at each of said control stations, a registry switch individual to said person and having a terminal position for each section of said area, a connector switch for each section of said area, a dial at each of said control stations, means responsive solely to the off-normal movement of a dial at any of said control stations for preparing the corresponding section connector for the receipt of pulses transmitted incident to the operation of said dial, means responsive to the dialing of the call number of said person at the said any of said control stations for causing the said persons corresponding registry switch to be operated to a position corresponding to the section at which the said any of said control stations is 7 FRANKLIN DAVID NITTERAUER.