US2116372A - Signal transmitter - Google Patents

Description

May 3, 1938.

i SIGNAL TRANSMITTER Filed sept. 21, 1935 4'sheets-sheet 1 .E \`l -llllllllvlllllllly f1 55 W /qfaa l F. E. wELD 2,116,372

May 3, 1938.

F. E. WELD 2,116,372

S IGNL TRANSMITTER Filed Sept. 2l, 1935 Sum 4 Sheets-Sheet 3 May 3, 1938. F, E WELD 2,116,372

S IGNAL TRANSMITTER Filed Sept. 2l,- 1955` 4 Sheets-Sheet 4 QM/Wim@ Patented May 3, 1938 .SIGNAL TRANSMITTER Foster E. Weld, Newton, Mass., assignor to The Gamewell Company, Newton Upper Falls, Newton, Mass., a corporation of Massachusetts Application September 211933, Serial No. 690,408

12 Claims.

The `present invention relates to devices for transmitting code signals of the type which are used in fire alarm systems and similar circuits. Such installations permit the sending of code 5 numbers by consecutively energizing and deenergizing a circuit at certain 'intervals grouped with intervening pauses of varying length, and representing the digits of numbers of known significance. It is often desirable to' distribute or repeat such code signals in the simplest possible manner.

'For example, the telephone exchange of a community may be'organized for transmitting in the form of code signals, alarm messages orally received from the subscribers over the ordinary telephone network. A person may discover a lire, thereupon call the exchange and report the occurrence to the operator, who immediately notifies the fire department of the alarm.

It is highly desirable to provide the telephone operator with means for transmitting the alarm in a'manner that is customary in the fire lighting service, namely, as code number signals mani` fested as bell strokes and/or recorded on tape. 7, Hence, thel telephone operator may select, for example Vwith the aid of charts or tables, vthe code signal standing for the locality. from which the alarm was received and'transmitfthis signal to the re department.

vIt is therefore one of the principal objects of the present invention to provide apparatus forv sending variable code number signals in the simplest possible manner, thereby reducing the operators activity to a minimum and excluding 5 to a very high degree the possibility of making errorsin the transmission of the signals.

With the aid of the equipment according to this invention, the telephone operator, after receiving the call and selecting a number associated -With the location of the re, sets up this number and,O if desired, an additional special number of a prearranged meaning, with the aid of a digit setting device, upon which he can visualize the number, presses a button and thereby initi- -v ates transmission of the number repeated any desired number of times. Or according to one embodiment of the invention, the telephone op-Y erator may dial the number once on a conventional telephone dial, whereupon the signal is transmitted a predetermined number of times to the re authorities without any further activity by the operator. It `is further feasible to connect the new apparatus to a conventional signal manifesting device and to repeat any one incoming code number as often as desired.

such numbers with the aid of a conventional Accordingly, further objects of my` invention are to provide means for setting up a code signalV by manually establishing certain electric connections representing code numbers or by dialing telephone dial switch; to provide means for subsequently transmitting the set up signals a desired number of times, the transmission being initiated automatically when the complete signal 'is set up, or by a simple manipulation as, for example, pressing a switch button; and to provide means for automatically` storing code signals manifested in a conventional alarm or similar circuit and then transmitting these signals.

In another aspect, the invention contemplates a signal circuit connected with a device sending into the circuit current impulses at regular intervals and having instrumentalities which prevent the eiectiveness of certain of those impulses, thereby forming signals according to a prearranged code.

In a further aspect, the invention provides an automatic signal storing and transmitting device which is comparatively simple and reliable,v due to the utilization of conventional telephone selector switches.

These and other objects and aspects of the invention will be apparent from the following detailed explanation illustrating the genus of the invention with reference to several concrete embodiments thereof. The description refers to drawings in which- Fig. l is a circuit diagram of a variable signal sender with manual digit setting device and independent starting device;

Fig. 2 is a circuit diagram of a variable signal sender including means.for automatically storing and retransmitting a signal received either from a signal manifesting device or-a telephone dial;

Fig. 3 is a simplied straight line diagram incorporating part of the circuit according to Fig. 1;

Fig. .4 is the diagrammatic representation of a 'signal stored and transmitted with apparatus according to Fig. 2; and

Fig. 5 is a simplied diagram similar to Fig. 3, of part of the automatic digit setting device incorporated in the modification according to Fig. 2.

'I'he circuit which is diagrammatically shown in Fig. 1 comprises battery B, starting key K,4 impulse sender I, maintenance relay M, stopping relay S, alarm relays R, R', change-over switch O, control relay C, limiting relay L, transmitting, 55

as battery B, supplies the system with current.

In order to simplify the circuit diagrams, the individual connections with the power source have not been shown in Figs. 1 and 2, but the points of the circuit which are supplied with current have been indicated by appropriate polarity signs, these points being assumed to be in conducting connection with the respective poles of thev battery.

- these members.

'I'he starting key K consists of two resilient switch members and |02 separated by an insulating block |00 and preferably designed as a push button switch permitting simultaneous actuation of members I0| and |02 which cooperate with contacts |03 and |04, respectively. The respective members contact upon pressing the button, and connection is interrupted when the push button is released. Itk is understood that these contacts or similar organs may be operated in a different manner, for example, by means of a. magnet, as shown in the modification according to Fig. 2.

The impulse sender I has the purpose of sup- Dlying the system according to the inventionl at regular intervals with current impulses. Any arrangement adapted to this purpose may be used, but in the herein-described embodiment I eni ploy rotating impulse switches |20 and |30. Switch |20 comprises a cam disk of insulating material, with raised portions ||3 and lower portions ||2. The cam disk actuates al follower switch ||4 which rests against a starting contact ||5 if sliding on the lower c'amportions 2, but leaves ||5 and connects with an impulse contact ||6 when raised by cam portions ||3.

Disk is fastened to shaft |2|, driven by motor |22 herein assumed to be a' self-starting synchronous motor with rotor |24 and stator |25. A second impulse switch |30 is quite similarly constructed to shaft |2|,; fsk |3| being similar with the difference that. itrv has only cam portion. i and,|36 corresponding to members ||4, ||6, respectively, in the manner described above for Switch |30 supplies the system with current impulses at one-half the frequency of the impulses provided by switch |20, as will be apparent without further explanation.

The maintenance relay M consists in' substance a maintenance Imagnet 4| controlling normally to disk i one raised open switches 42, 43, 44, respectively, which close upon energization of magnet 4|.

Stopping relay S comprises a stopping magnet 5| and a three-contact stopping switch 50 of the make-before-break type. Normally, movable contact 52 connects with fixed contact 53 which is joined to the positive pole of battery B.

for example, equipped with a copper sleeve of well known retarding effect and, if energized, attracts armature contact 54 which reaches movable contact52 before" it lifts the latter from fixed contact 53.

The alarm relays R and R are representative of devices suitable to transmit signal impulses to' conventional signal manifesting apparatus or circuits, as registers, signal bells or repeater circuits as-commonly used in re alarm systems. In

andy has a disk |3| also keyedv It cooperates 4with contacts |35 the retarded releasevtype, being,

the present instance', it may be assumed that the magnets of relays R, R' are normally energized, and upon deenergization cause manifestation of one signal element, for example, the stroke of a bell.

Alarm relays R and R can be selectively connected either to the slow running impulse switch |30 or the fast running impulse switch |20, respectively, by means of change-over switch O, comprising movable contacts 6 I, 62 and fixed contacts 63, 64, 65. 66, which are connected to contacts |36, H6, and relays R, R', respectively. In the position shown in Fig. l,v contacts 6|, 62 connect the quick acting impulse switch |20 to relay R. By shifting members 6|, 62 to contacts 63, 65, slow acting impulse switch |30 can be con nected to relay R.

Switch member 62 is'connected to limiting relay L through' lead 1|, and member `6| is connected through lead 12 to the fixed contact of switch 44 of maintenance relay4 M. The terminals of relays R, R' which are not connected to contacts 65, 66, respectively, are joined, and connected through lead 13 to control relay C.

'Ihe stator |25 of motor |22 is supplied from a suitable source of current, in the present embodiment alternating current derived from a transform'er |29, by means of leads 14, 15 and 16. Wire 14 is connected intermediate stator |25 -and starting key contact |04. Wire 16 joins transformer |29 and starting key member |02. Lead 15 connects the other terminal of transformer lThe corresponding fixed contact |03 is connected through wire/16 to magnet 4| of maintenance relay M, whose holding circuit including switch 42 has been described above. Lead 16 is further branched' into lwire 19 leading to relays C and L.

It will now be apparent, that, when the starting button is pressed, switch |0||03 connects the motor circuit and starts motor |22 and that switch |02|04 sets up the following circuit. If follower switch 4 of impulse sender I happens to be in the lower position as shown, or as soon as it arrives in that position (the motor being already started), it connects starting contact ||5 and lead 80'with the positive pole of the battery, .and through switch |0||03, lead 10 and magnet 4|.connects with the negative pole, thereby energizing maintenance magnet 4|. mediately closes its switches and remains in that position after the starting key is released, due to Magnet 4| imthe holding circuit established through switch 42,

from positive at fixed 'contact 53 of stopping relay S through 52, lead 0|, switch 42, magnet 4| vvto negative. 'I'his holding circuit remains closed, ,and magnet 4| energized, as long as contact 52`of maintains a Circuit from the impulse sender I through change-over switch O and lead 12 to impulse wire 11.

The controlI relay C consists of a magnet |4I, two armature contacts |42 and |43, spring contact IM and two fixed contacts |45 and |43.

Contact |43 is connected to the aforementioned wire 11, contact |42 is connected` to one terminalv of magnet I4| (whose'other terminal is joined to lead 19), and contact |43 is connected to leads 13 and 86. In normal position, as shown in Fig. 1, when magnet |4I is deenergized, contacts |44, |45 and |433, |46, respectively, are connected, whereas contacts |42 and |44 are separated. Upon energization of magnet Mi, armature contacts |32 and |43 are attracted and contact at Mii- |46 is interrupted. Member `|42 establishes effective connection with spring contact |44, before it removes the latter from fixed contact |45, so that connection is established at |44 before contact is broken at |45.

" Ihe limiting relay L consists of a magnet which controls three armature contacts |52, |53, i

|54 associated with four fixed contacts |55, |56 and |51, |58, respectively. Under normal conditions, as shown, when magnet I5| isdeenergized, contact pair |52, |55 is separated, contact pair |53, |53 is connected and armature contact |54 which cooperates as change-over element with xed contacts |51, |58, rests against contact |58. Upon energization of magnet I5|, contact is established at I52-|55, contact is broken at |53-|56, and switch |54 changes from contact |58 to contact |51.

One terminal of magnet I5I is connected to lead 19Yand the corresponding terminal of magnet |4| of control relay C. The other terminal of magnet I5I is connected to xed contact |55.

Armature contact |52 and fixed contact |51 are on the negative pole of the battery. Armature switch |53 is joined by lead B2 to fixed contact |46 of control relay C. Fixed contact |56 connects with change-over switch O through the aforementioned lead 1|;

Transmitting switch T and pause switch P are telephone selector switches of the Well known ty-pe which consecutively connect a number of contacts step by step with a common terminal. The function of the transmitting switch T is to count the number of strokes in each digit while that of the pause switch P is` to cause the digits of a signal to be transmitted in proper sequence and with proper pause intervals between each digit.

. These switches are, therefore, also referred to as impulse counting switch and sequence switch", respectively. Referring more particularly to transmitting switch T, this mechanism comprises three selector units I|, |2 and -I3, each having a series of selector contacts, and wipers 2|, 22, 23, respectively, the three wipers being mechanically connected to move in unison. In order to simplify drawings and description, the selector contacts are herein designated by their position withinthe selector unit, combined with the selector unit'f'nurneral,` both numerals' being separated by a' colon, so that, for example, the tenth contact of selector,v switch i2 will be referred to as contact |il:|2.

The wipers normally contact with the first selector contacts of the respective unit and are advanced by means of an actuator magnet 3| operating a stepping switch 32 which contacts with actuator contactl 33, connected to the negative pole of the battery, if magnetv 3| is d'eenergiz'ed.

, The magnet and its armature, that is, stepping switch 32, are so organized that the `three wipers of the transmitting switch are advanced one single step, from onecontact to the adjacent one, upon each deenergization of the actuator magnet. Such selector switches are well known in the telephone art and need not be described more in detail. It should, however, be observed that wiper 2| should be of the make-before-break type. For example, it may have sliding contacts or brushes sufficiently wide to touch the next contact before they leave the preceding one. Recapitulating the `operation of this switch, it remains at rest so long as magnet 3| is energized, under which condition stepping switch 32 is separated from xed contact 38. Upon deenergization of the magnet, stepper 32 is retracted therefrom by suitable means, advances wipers 2 I, 22, 23 one step and contacts with xed contact 38. If lead 83 is disconnected from the energy supply, 3| is again energized, 32 attracted, and so on, stepper 32 vibratingand advancing the wipers quickly (preferably within one impulse of |29 or |30) over the selector contacts.. If, however, lead 33 is connected to negative, stepper 32 remains attracted to magnet 3| as long as the latter is energized, regardless of the'interruptions at 38. The wipers rest normallyvupon the first contacts of their respective selector units, as shown in the drawings.

Pause switch P is constructed similar to trans-- mitting switch T, having three selector units I 4, I5, I6 with wipers 24, 25, 26, respectively, and corresponding rows of selector contacts which will be identified by double numbers like the selector contacts of switch T. Actuator magnet 34, stepping switch 35 with xed contact 39 (connected to lead 89), and the wipers 24, 25, 26, operate in the same manner as the corresponding elements of the transmitting switch. Like the wipers of switch T, the members 24, 25, and 26 rest initially at the respective first selector contacts. Both switches have conventional spark suppression arrangements 33 and 31, respectively, bridging contacts 32, 38 and 35, 39, respectively. Confl tacts 39 and 35 are normally bridged through leads 89 .and 94 and contacts |54--I59 of limit-A ing relay L.

The digit setting device D may consist of any instrumentality for selectively connecting a se ries of conductors (in the present instance number busses Il to 9) with a second series of conductors (in this embodiment digit busses h, t, u; h', t', u).` This might be accomplished, for example, by connecting a flexible wire ending in a plug `to each digit bus and by providing each number buswith as many plug receptacles as digit busses are used. Each digit bus could then be pluggedinto any of the number busses. Or,. v

the two bus series can be arranged on two sides of an insulation panel and holes drilled through busses and panel at each crossing of the former. Metal plugs can then be inserted at any crossing for establishing contact between any pair of number and digit busses. In Fig. 1, an arrangement of the latter; type is diagrammatically shown, the plug connections being indicated with full dots. In the present instance, it is assumed that a special number group consisting of a current impulse series arranged to represent a nurnber with three digits, namely hundreds, tens and units, should be transmitted, followed by similarly constituted signals representing a `box number. Accordingly, there are ten number busses Il to 3, three special signal digit busses h, t, u.; and three box number digit busses h', t', u. example, intended to set up and to transmit a If it is, for

mission of more than two different numbers. It

will also be apparent that the apparatus may be simplified by providing for a single number, when only three digit busses are required.

As shown in Fig. 1, one terminal of each actuating magnet 3| and 34, respectively, is connected to the aforementioned lead TI, whereas the two other terminals of these magnets are connected to the respective stepping switches. 'I'he stepping switch 32 of selector T is connected through wires 83 and 85 towiper 23 of selector switch I3 and through wires 83, .84 to contact |:|2, which is part of a group of electrically interconnected contacts, as shown in Fig. 1. Contacts I:|| to I: I I of selector switch I| are similarly interconnected and electrically joined to armature switch |44 of control relay C, by means of lead 86. Contact 22:|| is connected, through lead 89, to stationary contact 39 of switch P and to armature switch member |54 of limiting relay L. Wiper 2| of selector switch II is electrically linked to the negative pole of the battery, and wiper 22 of selector switch I2 is connected through lead 81 to xed contact |45 of control relay C. Contacts |:I3 to I0: I3 lead to number busses 0 to 9, respectively. Contacts II: |3 to 2|: I3-are interconnected and joined to contact 3: I5 of relay P,

by means of lead 88. Contacts 22: I3 and 23: I3

are interconnected and joined to the negative pole of the battery.

The wiper 24 of selector unit I4 (switch P) is supplied from the positive pole of the battery. The contact 23: I4 of the same unit is connected through lead 9| to armature contact 54 of stopping relay S and with it to one ter'minal of magnet whose other terminal is connected to the negative terminal of the battery.

The wiper 25 of selector switch I5 is supplied from the negative pole of the battery. 'Ihe contacts of this selector switch are in the present example interconnected as follows: 3: I5to 6: I5, 9: I5, |2:|5 and I5:I5, always omitting two contacts. Contact 3: I5 is further connected through lead 88 to contact 2|:|3, as heretofore mentioned. Contacts 4:I5, 'I:I5, I0:|5, II:I5 and I 6: I5 are brought out to points X, I, 1I, III and IV, which may be, for example, receptacles for receiving a plug contact fastened to a exible wire 93 leading to xed contact |55 of limiting relay L and to its magnet I5I. In this manner, these elements of relay L can be selectively connected to any one of contacts 4:|5,|`|:|5, |0:|5, |3:|5 and |6:I5. Contact 23:I5 is connected through lead 94 to stepping switch 35 of switch P and also to fixed contact |58 of limit relay L.

The wiper y2li of selector switch I6 is connected through wire 95 to armature switch |42 of control relay C andthat terminal of magnet |4| which is joined to said switch. The contacts of selector unit I6 are associated with the digit busses as follows: Contacts I:I6, 2:|6 and 3:|6 are connected to busses h, t, u, respectively, whereas every fourth of the remaining contacts is connected to the same bus h', t', u', respectively,

that is,`4:||i, 1:|6, I0:|, etc., are connected to h; 5:|6, 8:|6, I|:|6, etc., are connected to t', etc. As mentioned before, the present embodiment of the invention provides for the transmission of code signals comprising manifestations arranged in code series representing two different number groups of three digits, each digit being made up of the appropriate number of individual strokes or other impulses. In the present instance, it is possible to transmit first a number group representing a special signal and subsequently a number group representing a box number, which box number can be repeated from one to four times.

The circuit of Fig. 1 is set up for transmission of the signal 2| 3, 4I2, 4|2, by connecting number and digit busses, as above described, and by connecting wire 93 through plug 90 and receptacle II to contact I0: I5, which set up provides for transmission of the above signal, the box number being repeated two times, as will become apparent from the following description of the operation of the new system. In describing the operation of the system according to Fig. 1, it is also assumed that it is desired to send signals at fast speed, switch O being in the position shown.

In order to transmit the signal selected in this manner, it is only necessary to press the push button |00 of starting key K, thereby connecting contacts |0I, |03 and |02, |04, respectively. The closing of the latter contacts establishes, through leads 14 and 16, a motor supply circuitfrom the secondary of transformer |29 through 15-I25-14-I04-I02-16 back to |29. Upon being supplied with energy, motor |22 begins to run at its prescribed speed, and impulse switch |20 of impulse sender I connects contacts ||4 and |I5 during, say, the rst and third quarter of each revolution of shaft |2I, and contacts I|4 and I I 6 during the second and fourth quarter. Member r|0| of starting key K is depressed together with |02 until it reaches contact |03. At this time, follower switch I|4 is either in the position shown, contacting with II 5, or will soon be in that position, since motor |22 is started at the same time and changes the position of the follower even if the starting key |00 is released after a comparatively short time. Connection being established at IOI-I03 and II4-II5, a circuit from minus pole through magnet 4| of maintenance relay M-lead '|8- |03I0llead 80-contact II5-follower switch |I4 to plus pole is closed and magnet 4I energized. Magnet 4I attracts its armature members and closes switches 42, 43, 44, thereby establishing the following circuits. A holding circuit for magnet 4I is closed from minus through 4|428|5253 to plus. A`motor holding circuit is closed from transformer |29 through 16--43-14-|25'-`|5 back to |29. These two holding circuits are established immediately when the starting key is operated, and the latter can now be released. without causing any change in the condition of the circuits as established at this time. 'I'hat is, magnet 4| remains energized and motor |22 continues to run .regardless of the position of members I 0I and |02 of the starting key and of the position of follower 4. Magnet 4| also closes, and retains closed impulse switch 44 which establishes, during each of the two periods of each revolution of disk III when follower |I4 touches contact IIS, connection from positive through follower |I4-I |6-64-6l of change-over switch O-'l2- 44to impulse wire 11. 'This connection is ini device will perhaps be easier comprehended by consulting the straight line diagram of Fig. 3, wherein the magnets and contacts are separated in such a manner as to render the tracing of the various circuits comparatively simple. `In order to permit convenient reference to Fig. l, the numerals of certain circuit elements are in Fig. 3 preceded by the letter of their respective circuit component. For example, contact |45 of control relay C is in Fig. 3 designated by the symbol C |45, and, magnet' |4| of the same relay by C |4I, indieatingthat both elements are parts of relay C. It should also be remembered that impulse wire 11 with branching point 10 is connected to positive whenever follower ||4 contacts with IIB, and hereinafter the circuits including the impulse wire need only be traced Vto point lltinstead of to positive through contact II4.

Assuming now that point 10 has just become positive (upon ||4 contacting with IIB), actuator magnet 3| of transmitting or impulse counting switch T is-energized through stepping switch 32 which Anormally connects to minus. Switch 32 is thereupon attracted and, as described before, remains in this position so long as actuator magnet 3| is energized. At this stage of the operation 3| remains energizedso long as 10 is positive, since the gap between 32 through 38 to minus is bridged through leads 83- 84-wiper 22--8If-I45--I44 lead 86-4wiper 2|- minus. Therefore, during the existence of this connection, 3| is only energized, and wipers 2|,

22,l 23 advanced one step when follower ||4 leaves IIB. It should be noted' that this connection bridging 32-38 exists so long as wipers 2| and 22 remain on interconnected contacts I:|I`

to I||:|| and |:I2 to |0:|2, respectively. It should also be noted that actuator magnet 34 of pause or sequence switch P is at this stage not energized, as will be apparent by tracing the connections from stepping switch `35, normally contacting with 39, which lead to selector contacts 22:I| and 23:|5.

It is further apparent that alarm relay R is deenergizedl whenever4 the -circuit from 1li through VII---I43 of control relay C--I4Ii-82- |53 of limiting relay L-I56-1I-62-56- 13-4I44-86' wiper 2|minus is interrupted at ||44|I6 of the impulse sender I. again that one signal manifestation as, for example, one stroke of a lbell, corresponds to each deenergization of R or R, each interruption yat II4-II6, or disconnection of point 1U, produces suchv a stroke. Hence, wipers 2 I, 22 and 23l movel now in unison one step at each discnnection of point Alll or each half uturn of shaft` 12|,I untilV wiper fr,23 reaches the first, selector contact plugged in or otherwise selected at the digit setter D. In the present instance, contact 3:|3 of selector unit j|3 (transmitting or impulse counting switch T)V is connected to contact |:I64 of selectorlunit I5 (pause or sequence switch P) through number bus 2 land digit bus h; Since the wipers advance, and alarm relay R isdeenergized at each interruption at ||4| I5, of the above tracedlcircuitfvrom plus'through TIL-11- |43-|46-82-l53l5tf-ll-62-f66-R-13w |44852| to` minus, a signal stroke is given by alarm relay R at each advance of the wipers.

Therefore, 4the wipers of T have now advanced I twice.' wiper 23 resting at contact 3: I3, and two Assuming Anext opening `of impulse contacts .nection at 32--38 to minus, establishes a circuit from the plus pole at 53 of stopping relay S through 52--3I--42--18-l9-I4i--95-wiper 26-contact IS-bus h-2-32 I3-23 to 35, and from there to negativey at 38 through 83 and 32, as well as to negative at 2| through 34--3: |2- 22-81-|',45-|44-863: |-2|. This circuit energizes magnet I4I of control relay C which thereupon attracts its armature members, dis-v connecting contact |43 from contact |46. This interrupts the aforementioned circuit which in cludes alarm relay R, thereby preventing energization of that relay (and therefore signal strokes due to following deenergization), so long as contacts |43 and |46 are separated. Energized'magnet |4I also attracts member |42, thereby closing contact |42-|44 and subsequently opening contact I44--I45. Contact |42-I44 establishes a holding circuit for magnet |4I, from positive at 53 through 52-8I- 42-18.13|4I-|42I44862I to negative, which retains |4| energized independently of the position of wiper 23.. -It should be noted that this holding circuit of magnet |4I includes selector unit and can only remain closed so long as wiper 2| remains on the contacts which are connected to wire 86, that is, contacts I:|| to' |0:I|.

The opening of contacts I44-I 45 interrupts the l aforementioned shunt of contacts 32-38, which,

'through 32 whenever the latter contacts 38,

whereupon it attracts 32, is deenergized, and'so on, thereby vibrating and quickly advancing wipers II, I2 and I3. The wipers pass thus quickly over `their respective `'contacts whereby magnet |4| remains energized through the interconnected contacts of selector unit I When the last of these contacts, namely I: I, is passed, lmagnet |4| is deenergized and its switches restored to normal. However, alarm relay R can not yet be operated by impulse switch |20, because its energization circuit leads through selector switches or I2, both of-which now interrupt this circuit since their wipers have passed the connected contacts. Stepping switch 32 continues quickly to advance its wipers until wiper 23 reaches contact |3:I3 which is 'directly conagain directly energized through 10, and 32 remains stationary until 3| is deenergized'after the I |4| I6. 'Thereupon 32 steps its wipers once, 23 leaves conwipers advance again quickly. The connection of contact I3: I3 .to negative and the ensuing operation have 4the purpose of making 'all pauses between digits substantially alike, as will be evident by considering that, no-matter from which' of the impulse switch which is the same no matter from which selector contact wiper 23 commenced to vibrate.

last but one contacts of their respective selector units. It will be noted in this connection that the passing of wiper 23 over the contacts joined with each other, and to contact 3: I5 of selector unit I5, is of no consequence at this time, since wiper 25 of unit I5 rests then at the idle contact I: I 5.

Upon arriving at contact 22: I3, wiper 23 connects magnet 3 I directly to negative, thereby stopping the quick 'advancement of the wipers of T, with these wipers at the aforementioned penultimate selector contacts. Wiper 2| at contact 22: I I establishes a circuit from negative through 2 |22: I I-IlS-I 54-| SB-actuator magnet 34- 13 to plus at follower switch ||4 so that actuator magnet 34 of pause switch P is energized and, upon the next disconnection at ||4| I6 advances the wipers 24, 25 and 26 of control switch P one step, so that wiper 26 rests now at contact 2: I6 which is connected to digit bus t. Wipers 24 and 25 are at unconnected contacts 2: I4 and 2: I5, re-

spectively. As will be understood withoutfurther explanation, the interruption at impulse contacts I |4| I6 also advances the wipers of transmitting switch T, which stand now at the last contacts of their respective selector units. Since contacts 23:|2 and 23:|I are unconnected, but 23:|3 is connected to negative, the next interruption at |I4| I6 advances these wipers one step further to their initial positions where their opposite, heretofore idley brush arms contact with |:I2 and I: I3, respectively. It'should be nted that, since contact 23: Il is idle, actuator magnet k34 of pause switch P remains denergized after the one step advancement of its wipers, which therefore remain at their above-indicated positions at the second contacts of their respective l selector units.

The elements of the circuit are now in the same position as at the beginning of the transmission of the first digit 2", with the only diierence that the wipers of pause switch P have advanced one contact, that is, as pointed out before, wiper 25 rests at the selector contact 2: |6 which is"con nected to the tens digit bus t. 'I'he following op-,- eration is exactly like that for the hundreds digit, and` at theend 4of the transmission-of the tens digit the wipers of P are located at/the third selector contact, that is', 'wiper` 25 rests 'at 3:|5- which is connected to the five interconnected contacts ||:I3 -to 2|:I3 of transmitting switchl'l. The transmission of the third, or unit digit now completed from actuator switch 32 through 33-35-23-I1: |3--38--3r I525 to negative, that' is, magnet 3| is now directly on negative i and can not quickly advance the wipers of transmitting switch T to the penultimate contacts. but 'can only advance them step by step at each interruption at impulse contacts ||4-||'5, until lthey arrive at these penultimate contacts, namely, 22: I 22: I2 and `22: I3, respectively. Contact 3: I5 and wiper 25 are then again-disconnected but magnet 3| remains directly connected tonegative, which connection is accomplished through 22: |3-23-l5-33. As described above, the wipers of P advance one step, wiper 25 arriving at 4:|5 and wiper 25 at 4:|5, which is connected to box number digit bush', and the wipers of T are restored to their initial position. n

It will now be evident that a uniforni"digit pause" corresponding to one impulse period or interruption at ||4.-| I5, or one step'of wiper 23, is provided between two subsequent strokes of one The wipers 2|, 22, 23 pass now quickly on to the digit; that a -number pause, similarly corresponding to the four steps of wiper 23,(at I: I3, I3: I3, 22: I3 and 23: I3) is provided between consecutive digits of one number, and that a group pause corresponding to one lstep of wiper 23 at |3:|3,seven steps from |'|:|3 to 23:|I| ,I and one step at I3 (a total of nine steps) is providedbetween numbers.

With the relays in the position above indicated (wipers of transmitting switch T ininitial position and wipers of P on fourth contact), the device according tothe invention begins to transmit the box number set up with the aid of busses h', t', u', in a manner identical to that, above described for sending the special signal. There is again aV pause equivalent to one stroke between the strokes, a fourestroke pause between digits, and a nine-stroke pause between numbers. If it is desired, as, for example, in the present set up,

to vsend the boxl number twice, round plug 30 is connected to round jack II.

In theassumed instance, after having transmitted th`e\last stroke of the last digit of the second repetition of the box number group, wiper 25 has reached contact |0:|5 (connected, with round jack II) wiper 23 stands on contact 22: I3 and wiper 2| on 22: I I, waiting for an interruption at contacts ||4| I6 of the impulse 'sender to be shifted to the last contact. At this stage. however, a circuit is established from minus at wiper 25 through Ill: |5-II-90-93-magnet |5|1918428|5253 to plus, which circuit energizes magnet |5I of the limiting relay L,

which thereupon attracts its armature members |52, |53 and |54. Contacts |52|55 establish a holding circuit for |5| from negative at |52 through |5||55-I5I-19-16-42-8I-52--53 to plus, which remains closed as long as maintenance magnet 4| remains energized. The separation of contacts I53-I56 interrupts the energization circuit of alarm relay R, which is from now on incapable of manifesting signals. 'Ihe attraction of member |54, which'has up to now shunted contacts 35 and 39 of pause switch P (preventing vibration of actuator switch-315) directly connects minus at |51through |54-35- 39-35-34 to 10, causing actuator switch 35 to vibrate. Wipers 24, 25, 26 are quickly advanced during the periods when ||4| I6 contact, ntll they reach. the last contacts of "their selector that all six wipers stand now on the last contactsoftheir selector units. Wiper 24 oncon'A `tact 23:'I4 thereupon establishes a circuit from plus at 24 through V23: |4`9|5| of the stopping relay S to negative, which circuit energizes the lslowly releasing magnet 5| ofrelay S. Magnet 5| attracts its armature 54, thereby shifting'the lpositive supply connection of maintenance mag- 'throughapoint'll switch 44 and impulse sender contacts II4-I I5. At the next interruption of thiscircuit at.|I4-||6, all wipers are,n 1oved" home into their initial positions'. `Magnet. is

dee'nergized'. by the brea at 23,: I4 and drops its armature switches 42, 43, 44. stopsmotor |22 at '43, opens the holding circuit of magnet 4| units. Wiper 25 arriving at 23: I5 puts 34 again directly on negative' and stops it vibrating, so takes place in the same manner, untilwiper 23 l reaches contact I3. At this stage, a circuit is at 42 and disconnects impulse wire Tl. at '44,' Magnet |5| of limiting relay L is thereby deenergized.v

Shortly fafterwards, armature 54 o f'magnet 5| oi' stopping relay S has dropped so'- that the Iwholemitting switch T in such a manner that contacts n is energized when wiper 2| engages contact 22: II

`whereupon wiper 26 of unit I6 advances one step onto contact 2: I6. Wiper 23 moves over the selector contacts of unit I3 without initiating a signal stroke, as will now be apparent without detailed explanation of the connections and circuits involved.

If transmission of the special signal only is desired, plug 90 is connected to receptacle X so that signal transmission is terminated with the la'st `stroke of the unit digit of thespecial number.

It will now,be evident that the signal presetting device of Vthe invention, combined with the automatic transmission of the prearranged signal, provides for visualization, and therefore almost certain correctness of the number 'to be transmitted, which excludes any errors during repeated transmission thereof, as invariably occur when the signal impulses are manually repeated, for example, with the aid of a telegraph key.

The embodiment-shown in Fig; 2 is essentially identical with that f Fig. 1 with the exception that the digit setting device D is,` in this modi-4 iication, replaced by a number distributor or pre-` selector N and digit automat A which, together with holding relay H, actuating relay G, and alarm circuit relay F or telephone dial E, permits the automatic setting up or storing of code signals, and the subsequent automatic transmission of these signals.

The number distributor N is substantially a telephone selector switch of `a Well known type and comprises a 'selector unit 2||J with a row of ten selector contacts whichv will herein be referred to as |:2'I0 to |0:2I 0,-respectively, a'single arm wiper 220,-anaotuator magnetZ I4, a restore magnet 224 and a retaining, switch 230. With this type of selector switch, thewiper contacts initially with the iirst contact |:2||l', is moved one step by each deenergization of actuator`magnet 2|4,

,andy restored to initial'position at I:2|0 'by rey store magnet 224 when the latter is energized. f lThe retaining switch 230 is closed when the actuator magnet 2|4 is first energized, and remains closed `until the wiper is returned to its initial position. Switches of this kind are quite similaru to the more widely used type where a control switch is not closed until the magnet is ,dee'nergized; the only difference is that switch 23|) is closed by the initial energization' ofmagnet 2|4 instead of its first deenergization.

The digit automat A consists essentially of three selector switches like that of distributor N ,3 and has three selector units` -2I I, 2|2, 2|3.with wipers22I, 222, 223, respectively, actuator magnets 2|5, 2I6,..2|1, respectively, and restore magnets 225, 226, 221, respectively. These three se-J lector switches operate 'i'ndepe'ndently of each .other similar to distributor N, with the exception 'that only the first one is provided with a retaining switch 23| which is closed when actuating magnet 2|5 is energized and openswhen the wiper of this-magnet returns to initial position. As shown in Fig. 2, the contacts of units 2| I, 2|2, 2I3 are joined to the number busses of trans- I:2|I, |:2I2, I:2I3 are connected to bus il, contacts 2:2I I, 2:2I2, 2:2I3 to bus I, etc., corresponding contacts of each unit beingl associated with the same number bus. Wipers 22|, 222, 223 are connected to digit busses h", t,u, respectively. The contacts of 4selector unit I6 ofpauseswitch P are connected to the digit busses in groups of three, that is, contacts |:|6, 4: I6, 1:|6 are connected to `bus h; 2; I6, 5: I6, 6: I6 are connectedto t"; and 3:|6, 6:I6, 3-:|6 are connected to u".

The terminals on one side of each restore mag` net 224, 225, 226, 221 are connected to negative as indicated, the other terminals are joined and connected, through lead 96, to wire v9| which leads as in the embodiment of Fig.- 1, from contact 23: I4 to stopping relay S. The terminals on one side o`f each actuator magnet 2I5, 2|6, 2|1 of automat A are connected to contacts of the number distributor N, as shown, magnet 2I5 being associated with contact 2:2I0, 2I6 with 3:2Ill and 2|1 with 4:2IIJ. Contact |:2I0 is idle.

\negative yand energized, and the entire circuit conditioned inoperative for signal transmission, as will be readily understood from the following description.

The holding relay H comprises a magnet 24| which controls switch members 242 and 243 cooperating with viixed contacts 244, 245 and 246. Magnet 24| is normally energized, retaining members 242 and 243'in raised position and in contact with iixed contacts 244, 246, respectively. Magnet 24| is of the type which attracts an armature quickly, but releases it slowly, having, for example, a copper sleeve mounted on the magnet core. after a predetermined period, fixedcontacts 244 and 246 are disconnected, whereas contact 245 -connects with member 242.

Actuating relay G has amagnet 25|, three When members 242 and 243 are released armature members 252, 253, 254 and three fixed contacts 255, 256, 251. Magnet 25| is likewise of the retarded type, but'releases its armature still slower than magnet 24| of holding relay H,

as indicated by its longer sleeve. The delayv periods of magnets 24| and l25| must be'properly timed with lrespect to the operation -of the signal` storing device as a whol, in a manner which will be evident from 'the following description. Magnet 25| is normally deenergized, and in this condition members 252--255 and 2,53-256, respectively, contact, whereas memberswv254' and 251 are disconnected. Upon energization of magnet 25|, contacts 252--255 and 253--256, re-

spectively, are vdisconnected andA 254-251 -are connected. i i 1 The fire alarm circuit relay Fi(hereinafter referred to as kiire relay) has a magnet 26| and, a switch member 262 associated with iixed contacts 263 and 264. Magnet 26|` is normally energized, since it is assumed to be-partof a conventional nre alarm circuit which carries current under normal conditions and contains alarm boxes and manifesting relays (corresponding to relay F) in series connection. The'code signal impulses are transmitted as circuit interruptions, each interruption causing a deenergization of magnet 26| in a manner to be described in detail hereinafter. Contacts 262 and 263 are disconnected, and contact is established between members 262 and 264, at every deenergization of magand 212 and normally separated oilf normal contacts 213, 214 and 216. When dialing commences,- contacts 213, 214 and 216 close. They remain closed during dialing, but are open whenever the dial is at rest. Impulsey contacts 21|, 212 are opened during the eiIective return movement of the dial a number of times corresponding tothe number of impulses to be transmitted for each dial turn. In other words, when, for example, the operator dials 213 and begins to turn the dial disk clockwise, switches 213-214- 216 close. When the disk returns, contacts 21|-212 open and again close two times, and then 213-214-216 open again. When the tens `digit one is dialed,v213214-216 close, 21|- 212 send one impulse by opening once, and 213-214--216 open, and similarly for the unit digit.

As shown in-Fig. 2, one terminal of magnet 24| is connected to negative, and the other to contacts 263 and 216. Contacts 242, 264, 214, 261, contacts 243, 263 and contacts 212, l 213, 264, respectively, are joined in three groups and contact 262 is connected to the positive terminal of the battery. Actuator magnet 2I4 of distributor N is connected between contacts 246 and 243 through wire 28|, and the negative terminal of thebattery. Wiper 220 isjoined to contact 232 L of the retaining switch and througnwires 232 contacts 233 and266, through wires 33 and 63,

and 233 to contacts 244 and 266. Through lead 233, contact 233 is connected to one terminal oi' magnet 26| of actuating relay G whose other terminal leads to the negative'side of the battery.

Instead oi being manually controlled like starting key K of the modication according to Fig. l, starter key K of the present embodiment has a magnet 260 whose. terminals are connected to 55 respectively,.and which, upon energization, con- "as'describedin connection wlthFigs. 4lfam'i 3,1nand 7 l This embodiment incorporating the automatic/' signal storing d evicejas shownl in Figs. 2 `and 6. operates as follows:4 Assuming that it 'is desired nects contacts "I3-23| and |34 '232,. respectively. Maintenance relay M of this" `embodi ment has any additional contactl 43 connecting` ,with armature member 42 when .magnet .41 is w deenergized. Frm contact 43 leads afwire 31 tov switch 233. with contacts'232and 233. Contact., 232 is'connectedto dial contact 21|,through'lead 233, and contact 233 is joined to switch member 232 oi." ilre relayF. 'By shifting switch 233 con- 1 trol ofthe digitautornatcan be transferred vfrom ilre relay- F to telephone dial E. and ;v.'ice versa.

The remainder of the circuit is organized exactly need not be repeated.

.to .store fand' to transmit code signals arriving from a conventional nre^ alarm circuitfswlich 2961s positioned as shown, connecting lead 91 with armature member 262 of normally energized re 4relay F. A circuit is thus established from positive at 63 through 49-91-290-263-24I to negative, which circuit normally enegizes magnet 24| of holding rela'y H. Contact is therefore maintained at 242-244 and at'243--246, during normal conditioning of F, and a certain period after magnet 26| is deenergzed, which period corresponds to the time lag of magnet 24|. As pointed out before, relay F may be part of any conventional signaling system transmitting signals in the form of current modications arranged according'to a code. In the present instance it is assumed that code signals vmanifested at F are of the conventional ireI alarm` type, as illustrated in Fig. 4. 'I'his timing diagram indicates the periods (identified by letters a, b, c, etc.)jwhen magnet 26| is energized and deenergized, respectively, the` code signal received at F representing the number of a fire alarm box, for example, 213".

At the moment a when magnet 26| is first deenergized, armature switch 262 of relay F drops, establishing connection at 264 but breaking contact at 263 and deenergizing magnet 24|, which, however, as already mentioned, releases its armature members 242 and 243 only a certain time after its deenergization. Hence, a circuit is closed from positive at 63 through 262-264-242-244- 232-233--266-263-243-246-28 |-2 I4 to negative. This circuit energizes actuator magnet 2 I4 of number distributor or preselector N. At the same time, retaining switch 23o- 232 closes due to the construction oi' device N as described hereinabove and establishes `a circuit from plus at 63v` through 2 32-232-233-233-261 to negative, en- I ergizing magnet 26| of actuating relay G, which immediately attracts its armature members 262, 263 and 264. Member 263 opens the above-traced energization circuit of stepping magnet 2|4,`

whereupon wiper 223 advances one step from unconnected contact A Member 242 oi' H havingnot yet been released, a circuit is established from positive `through 233 232 234 242 244- 282-wiper 220- 2:2|3-2|6 to negative, energizing actuator mag- ,net 2| 6 of automat A and closing retaining switch -so thatV contacts 262 and 263 are still open. It should also be noted that the closing of retaining switch 23| o! automat A has as yet no effect since its circuit is open at' 266 of G.' The interruption. at 232- 234 opens the energization cir- -cuitof actuator magnet 2I6 which thereupon advances wiper l22|. one step from selector contact `2|6-negative is again closed, energizing stepping magnet 246 a second time. There has now been reached the number pause between points c and d of Fig. l4. during which magnet 23| remains .through contact 3:2||.

deenergized. The retarding device of magnet 24| is so designed that its armatures drop away after a period from the last deenergization (indicated at c of Fig. 4) which is shorter than the time interval c-d, and therefore the energlzatlon circuit of stepper magnet 2|5'is now interrupted at 242-244 and stepper 22| is again advanced one step, making connection with number bus 2 Contacts 262- 264 and 242-245 reestablish the energization circuit for actuator magnet 2|4 of distributor N, since -relay G is so timed that its armatures will not drop away during the period c-d and a certain period thereafter.

At the beginning of the manifestation of the next digit one (point d),.magnet 26| is again energized, and therefore also magnet 24|, as will now be evident. Magnet '26| attracting member 262 opensthe energization circuit ofv actuator magnet 2|4 at 264 (the circuit is also broken at 245) and wiper 220 is moved another step forward to contact 3:2Ili, establishing connection with actuator magnet 2|6 of selector unit 2|2 of the `digit automat.0 As will now be apparent, the next deenergization '(at point e) of magnet 26| causes stepper magnet 2|6 to be energized. 'I'he next p eriod being again a number pause,` relay 24| drops its armatures at point e', deenergizing stepper magnet 2|6 and advancing wiper 222 one step, from l|:2I2 to contact 2:2l2, connected with number bus I.

The nextand last digit three is tthen set up by moving wiper 223 three steps to contact 4:2I3 connecting with number bus 3, in a manner which will now be understood Without further explanation.

After the last digit stroke is set up there ensues a` pause, between the numbers of a so-called round of signals manifested at 26|, which pause is longer than those between the strokes' and the digits of any number, and during whichl the signaling circuit and magnet 26| are not carrying current. Magnet 26| is thereforev deenergized during this pause (beginning at point l of Fig. 4) and retaining magnet 25| is deenergized, which nally releases its armatures at point l' of Fig. 4. It thereby closes contacts 252 and 255", establish- Ving a circuit from plus at 252 through 255--98 200--99-233--23l to negative. Magnet .200 of the starter K is therefore energized, and lifts its armature contacts 20|, 202 into contact with ilxed contacts |03 and |04. I

This operation of starter K' has exactly the same eiect as the pressing of the starting key described in connection with Fig. 1,l namely, the transmission of the stored code signal for manifestatlon at relay R. It will of course be understood that the circuits from the number busses through the wipers' of .the digit automat to the digit busses h, t", u" (as, forexample, from number bus 2 through 3:2||-22 r-g-h", to |:I6 correspond exactly tothe manually plugged connections at digit setting device D of; Fig. `1, withA the hereinbefore mentioned difference that there is'no4 provision made for setting up aspecial. number since the re alarm circuit transmits only a.

box number. I A,

At the end of the transmission of a; predetermined number of code signals (in the present case two number groups, since plug 9i) is conestablished from. plus at wiper 24 through energizing said driving means, means Hence, a circuit is 23: |4-96--restore magnets to negative, the restore magnets are energized, the wipers of N and A restored to initial position and switches 230-232 and 23|-233 opened. The opening ofv 23|233 deenergizes magnet 200, so that the entire circuit is now restored to its initial condition. e

. If it is desired to set up a code number and to transmit it a certain number of times merely by dialing it nce on a conventional telephone transmitter, switch 290 is turned to make contact at 292. It will be evident that the operation of the dial initiates current impulses which correcommencement of dialing and remain closed during the entire dialing period. During closure of these` contacts, relay 24| is energized from minus pole through 215--214-213-212-21l- 292--290-91-49--42- 8|5253 to plus pole. Therefore, although relay 24| is deenergized when the dial is at rest, it becomesenergized as soon as dial operation begins, and the further operation proceeds exactly as in the case when the device is connected to relay F, regardless of the fact that relay 24| is deenergizedwhile dial mechanism E is at rest. Without any further operation the number is repeated into the re circuit and manifested with the aid of relay R a number of times which can be determined by .properly connecting plug 90 of pause switch P, whereupon the circuit is automatically restored toinitial condition and ready for transmission of another signal.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

1. An electric code signal transmitting device comprising output` contacts for connection with a signal receiving circuit, means for supplying current impulses at regular intervals to said contacts, maintenance means normally disconnecting Isaid contacts from said impulse supply means, normally deenergized driving means for4 said impulse supply means, means for operatively for closing said maintenance means, holding means maintaining the energization of saiddriving means and the connection of said contacts, contact means in series with said maintenance means for disassociating saidimpulse supply means from said contacts after reception of a predetermined number of impulses, means for reclosing said contactv means after omission of ,a predetermined number of receptions, and means said holding meansafter reception of a predetermined number of4 impulse groups.

2.Acode signal transmitter comprising means for supplying code signaling impulses at regular vintervals throughout the transmission of an intended code signal and for supplying a starting impulse duringthe'interval between each of the signaling impulses, an impulse counting switch having a stepping magnetoperable by said signaling impulses, a sequence switch having a stepping magnet likewise operable by signaling impulses, a maintenance relay in a normally open alarm s for inactivating starting circuit said relay being energized in response to said starting impulses during closure of said starting circuit and having a transmitter control circuit for initiating and maintaining operation of said switches throughout energization of said maintenance relay and a locking circuit holding said relay energized, a control relay, means for supplying said impulses to said counting switch, neans supplying a signaling impulse to said sequence switch for operation thereof at a predetermined position of said counting switch, circuits including said switches for controlling said control relay jointly by said switches for interrupting the supply of said impulses in response to predetermined positionings of said switches, to formulate said intended code signal, and a stopping relay controlled by said sequence switch for interrupting said lockingV circuit following complete transmission of the signal.

3. A code signal transmitter comprising means for supplying code signaling impulses at regular intervals throughout the transmission of an intended code signal and for supplying a starting impulse during the intervals between each of the signaling impulses, an impulse counting switch having a stepping magnet operable by said signaling impulses, a sequence switch having a stepping magnet operable by said signaling impulses, a maintenance relay in a normally open starting circuit said relay being energized in response to said starting impulses during closure of said starting circuit and having a transmitter control circuit for initiating and maintaining operation of the Said switches throughout energization of said` maintenance relay, a control relay, means for supplying said impulses to said counting switch, means supplying a signaling impulse to said sequence switch for operation thereof at a predetermined position of said counting switch, and circuits including said switches for controlling said control relay jointly by said switches for interrupting the supply of said impulses in response to predetermined positionings of said switches, to formulate said intended code signal.

4. In a code signal transmitter, means for supplying to a signal transmitting circuit code signaling impulses at regular intervals throughout the transmission of an intended code signal, two selector switches each having a plurality of contacts and a stepping magnet operable by said impulses for establishing connections step by step with consecutive ones of said contacts, a plurality of code setting circuits each comprising means for-establishing a connection between any one of certain of the contacts ofI` one of said switches and any one of certain contacts of the other of said switches, a relay energized through respective ones of said circuits when connection isiv established therewith through said switches concurrently, said relay having contacts operable in response to energization thereof for interrupting the supply of codesignaling impulses to said signal transmitting circuit, thereby formulating groups of signal impulses constituting a code signal unit, means for supplying said impulses to one of said switches, and means for supplying, after said rst switch has advanced a predetermined number of steps, one impulse to the second one of said switches, for changing the effective contact of said second switch, after formulation of-a code signal unit through operation of said rst switch.

5. In a code signal transmitter, means for supplying to a signal transmitting circuit code signaling impulses at regular intervals throughout the transmission of an intended code signal, two selector switches each having a plurality of contacts and a stepping magnet operable by said impulses for establishing connections step by step with consecutive ones of said contacts, means for preparing connections between predetermined contacts of the respective switches, a relay energized by concurrent connections, through said switches, of a contact of each of said switches for interrupting the supply of code signaling impulses to said signal transmitting circuit to formulate an intended code signal therein, means for supplying said impulses to one of said switches, and means for supplying one impulse to the second one of said switches after said rst switch has reached a position corresponding to a certain number of steps, to change the contact connection of said second switch after formulation of a signal by a preceding contact combination, for preparing the formulation of a subsequent signal.

6. An electric code signal transmitter circuit comprising means for supplying code signaling impulses at regular intervals throughout the transmission of an intended code signal, an impulse counting switch having a stepping magnet operable by said impulses, a sequence switch having a stepping magnet likewise operable by said impulses, means for preparing circuits made effective by certain positions of said switchesa control relay, and means, controlled by one of said switches, for operating the other switch to change its contact connection after formulation of a signal by a preceding contact combination, for preparing the formulation of a subsequent signal, said relay being jointly controlled by said switches for interrupting the supply of code signaling impulses at predetermined positions of said switches to formulate an intended code signal, means for supplying said impulses to one of said switches, and means for supplying one impulse to the second one of said switches after said first switch has reached a position corresponding to a certain number of steps, to change the contact connection of said second switch after formulation of a signal by a preceding contact combination, for preparing the formulation of a subsequent signal.

7. A code signal transmitting device comprising a signal receiving circuit; means for supplying to said circuit current impulses at regular intervals throughout the transmission of an entire code signal communicatiom'in series in said circuit; a stepping switch including an actuating magnet and an automatically interrupting quick acting energizing means for said magnet in series to said impulse supply means and in parallel to said circuit; means for initially shunt'- ing a signal receiving circuit; means for supplying to said circuit current impulses at regular intervals throughout the transmission of an entire code signal communication, in series in said circuit; a stepping switch including an actuating magnet and an automatically interrupting quick acting energizing means for said magnet in series to said impulse supply means 'and in parallel to said circuit; means for initially shunting said energizing means and periodically energizing said magnet through said impulses; means' disassociating means and simultaneously dis-` associating said impulse supply means from said circuit."

9. Code signal transmitting means comprising a current source; a signal receiving circuit;-

-means supplying from said current source impulses at regular intervals to said circuit; a normally closed cutout intermediate said supply means and said circuit; a digit setting device having two series of conductors and means for selecting connections between conductors of different series; an impulse counting stepper magnet and a quickly interrupting and reclosing vibrator switch connected to said source in series with said impulse supply means and in parallel to said circuit and said cutout; means normally shunting said vibrator switch controlled by said magnet; a first stepping switch actuated by said impulse counting magnet, vhaving a wiper connected to said magnet in parallel with said vibrator, a series of contacts with a number of consecutive contacts connected to one conductor series of said setting device, and a synchroni-zing contact following said initial contacts connected to said source; a sequence stepper mag/net connected in series to said impulse supply means; a normally open energizing contact closed by said impulse counting magnet towards the end of its cycle of operation, in series to said sequence magnet; a second stepping switch actuated by said sequence magnet having a wiper and" a series of contacts connected to the second series of conductors of said setting device; and a control magnet in series with said second stepping switch and upon energization opening said cutout and said shunting means; said stepper contacts and wipers being so coordinated that each current impulse reaches said circuitand energizes said impulse counting magnet until said first wiper reaches a contact connected by said setting device with said second stepping switch, said control magnet thereupon opening :said cutout and .opening said shunting means thereby causing said impulse counting magnet to advance its wiper quickly until said synchronizing contact is reached, where the vibrator is again shunted and the impulse supply means effect a further step .of th-e impulse counting magnet which again removes the vibrator shunt and advances said first wiper quickly until said energizing contact connects said sequence magnet/the impulse supply. means then energizing saidgsequence magnet,4

advancing said second stepping switch one contact to'connect with another conductor of said second series and returning said first stepping switch into initial position.

l0. Code signal transmitting means comprising a current source; a signal receiving circuit; means supplying from said source current impulses at regular intervals to said circuit; a normally closed cutout intermediate said supply means and said circuit; a digit setting device having two series of conductors and means for selecting connections between conductors of different series; an impulse counting stepper magnet and a .quickly interrupting and reclosing vibrator switch connected to said source in series with said impulse supply means and in parallel to said circuit and said cutout; means normally shunting said vibrator switch controlled by said magnet; a first stepping switch actuated by said impulse counting magnet, having a wiper connected to said magnet in parallel with said vibrator switch, a series of contacts with a number of consecutive contacts connected to one conductor series of said setting device; a synchronizing contact following said initial contacts connected to said source, and group-forming contacts following said synchronizing contact; a sequence stepper magnet connected in series to said impulse vsupply means; a normally open energizing consponding contacts of each group being connected in parallel to the second series of conductors of said setting device; a third stepping switch likewise actuated by said sequence magnet having contacts at intervals corresponding to the number of contacts in said groups connected to each other and to said group-forming contacts and a wiper connected to said source; and a control magnet in series with said second stepping switch and'upon energization opening said cutout and said shunting means; said stepper contacts and wipersl being so coordinated that each current impulse reaches said circuit and energizes said impulse counting magnet until said first wiper reaches a contact connected by said setting device with said second stepping switch, said conond series and returning said rst stepping switch into initial position, said operation being repeated until said third wiper reaches one of its connected contacts, causing said vibrator switch to be shunted and to advance slowly forming a comparatively long pause prior to repetition ofthe signal prepared with said contact group.

11. A device of the character described comprising means for manifesting code groups. of long and short signal impulses, digit selectors ar ranged for establishing in consecutive positions different signal actuating circuit connections, a preselector adapted to condition for actuation consecutive ones of said selectors, an actuating cuit establishing positions of' said conditionedl selectors during each of said short impulses and a predetermined time after the beginning of each long impulse.

12. A code signal transmitting device comprising means for communicating code groups of long and short. signal impulses; normally ineffective means for supplying to a signal transmitting circuit intermediate signal transmission impulses at regular intervals; meansfor starting said impulse supply means; two selector switches each having a plurality of contacts and a stepping magnet operable by said transmission impulses for establishing connections step by step with consecutive ones of said contacts; a plurality of code setting circuits including digit selectors establishing in consecutive positions diierent connections between any one of certain of the contacts of one of said selector switches and any one of certain contacts of the other of said selector switches; a preselector adapted to condition for actuation consecutive ones of said digit selectors; an actuating relay controlled by said code group impulses, said relaycausing said preselector to condition one of said digit selectors for actuation during the rst short impulse, and thereafter consecutively to condition different digit selectors; means for changing the circuit establishing positions of respective ones of said conditioned digit selectors during each of said short impulses and at a predetermined time after the beginning of each long impulse; means for actuating said starting means upon discontinuation of said code group communication for a predetermined time; and a relay energized through a respective one of said code setting circuits when connection is established therewith by each of said switches concurrently, said relay having contacts operable in response to energization thereof for interrupting the supply of intermediate signal transmission impulses to said signal transmitting circuit thereby formulating groups of signal impulses constituting a code signal conforming with said code group signals.

' FOSTER E. WELD.

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