US1044229A - Automatic telephone system. - Google Patents

Description

E; NEUHOLD.

AUTOMATIC TELEPHONE SYSTEM.

' APPLICATION FILED 0012a, 1010.

Patented Nov. 12,1912.

' UNITED STATES PATEN @FFICE.

ERW IN NEUHOLD, OF FBIEDENAU, NEAR BERLIN. GERMANY, ASSIGNOR T0 FIRMA UEUTSCHE TELEPHONWERKE, G. M. B. 11.. GE BERLIN, GERMANY.

AUTOMATIC TELnP HoivE SYSTEM.

Specification of Letters Patent.

PatentedNov. 12, 1912.

p 7 Application filed October 8. 1910. Serial No. 586.019.

To all whom it mag] concern:

Be it known. that I, Eiiwt x NEUnoLn, engineer, a subject of theKing of Hungary, andresident of Friedenau, near Berlin. Ger- I many, have invented certain new and usei ful Improvements in Automatic Telephone Systems. V I

The'subj'ectof the invention is an unpIOVEIDQIl'D in automatic telephone systems which makes it possible to effect the release of the speaking connections by simply break- 5 ing the circuit in hanging up the recelver, 1

and further to operate the control magnets of the selectors by means of two simple line relays 1n such manner that it is not neccrcases and increases of current and a subsequent lnterruption of the circuit occurring i ceiter to its movable hook. The two con trol relays then simultaneously release their armatures which now by suitable cooperation close the circuit of the release magnet or magnets.

In the drawing a few examples of construction according to the invention are illustrated which differ in the way in which the relay armatures cooperate to etlect the release.

A double line 1. 2. extends from the battery b of the exchange to the subscribers station which is connected in the usual manner for central microphone. supply and is provided with a microphone "1-, a receiver 25, essary either to earth the lines'at the subscribers station nor tohave the response of the relays i etarded by retarding devices. '5

According to the invention the controlling device referred to is operated by the subscriber through a series of alternate deimmediately after the previous wtarkeningot' the current. This regulation of the current is suitably ettected by means of an automatically operating spring driven contact device at the'subscribers station and is repeated as often as is necessary to correspond with the digits of the desired subscribers number. or to correspond with the operations required at the central station for the connection of the desired subscriber.

The periodic alterations of current set 1 the conductors an induction coil '11 and a bell to with a condenser c.

The currentsending device consists of a toothed wheel a which has a series of teeth of equal size and atv the end of this series a larger stepped tooth: this when rotated sets the switch a in oscillation. The back con tacts 3, -l. of this switch normally short circuit the resistance (Z and are broken in the most open position oi theswitch so that "l. i are interrupted. the

' switch is brought into the most open posithe armature of one of the control relays in i oscillation and the breaking of connections when this armature has been released for 1 the last time also releases the armature of the other control relay which up till then ment the small teeth of (2' insert the resistance relay for example controls the lifting magnet ofthe selector while the other armature completes the circuit of the turning magnot once and this magnet is then connected I are excited by current rlowing over conducin known manner either into the circuit of an interrupter so that the further turmng of theselector may go on automatically. or 3 into the place of the lifting magnet so that .ctt'ected by interruption of the current which "flows over; the lines during the eonversa tion..which current may suitably supply the '1n1crophonesby restoration of the re tion by the upper step of the large tooth ot the wheel a after the smaller teeth and the lower step of the large tooth have brought the switch into intermediatepositions in which only the contact 3 is opened while contact -t remains closed. The wheel a is turned in the direction of the arrow against the. action oi a spring and during this movctor 1. contact 3. microphone m. the front contact 5 on the receiver hook and conductor 2. and attract their armatures. At first no current impulse passes over the armatures. If. however. the resistance d is inserted in the conductor by the action of the current sender a, the relay A lets its armatures fall back a corresponding number of times and so period-:ally closes over its back contact T the circult Z), 6, E, I 8, 9, 1D in whicn IS the lifting magnet H of the selector, and the selector is consequently lifted a corresponding number of steps. The circuit of the auxiliary slow acting relay 1' is at the same time completed over the front contact 12 of b throughthe back contact 11 of a, this at 'mains in the unattracted position and the re: I lease of the armature of B occurring through the interruption of the conductor closes its back contact 13. At the same time contact 12 is opened but the relay r remains excited over the retaining contact 14 of its armature and over contact 11 of A. If this were not the case the release magnet It would be excited over 13, 15, 6 and would release the selector prematurely. On the contrary the closing of the back contact 100i B causes the turning magnet D of the selector to re ceive current over 10, 16, 17, 18, D, (i, and this magnet responds. By this means as already mentioned the selector is. turned one step in known manner (not illustrated) whereupon the switch operated by the selector shaft connects the turning magnet I) either (at the group selector) to a conductor carrying a periodic current by which means the selector is automatically moved on, or (at the line selector) to the conductor 19 in place of the lifting magnet H, so that it may be further controlled by the subscriber in desired manner. These operations are well known in automatic. telephone exchanges and need thus no further description. When the device a has run back the microphone circuit is again completed over the line so that during the conversation the relays A and B are excited. At the end of the conversation contact 5 is opened through the hanging up of the receiver on its hook, the

lines 1 and 2 are interrupted and thus there results a sudden falling backof the armatures of both relays A and B. The relay r is not now excited since atthe same time as y or even before the contact 11 on the armature A is closed, the contact 12 on the armas ture B is opened. Consequently contact 15 remains closed and current now flows over 10, 13, 15, R and 6 and excites the release magnet R. This causes the selector to return in known manner to its position of rest. As the arrow 20 indicates, during the production of the speaking connection the release magnets of the other selectors used are also automatically connected in known manner to the contact 15 sothat they are all simultaneously excited and all the selectors used are simultaneously released.

In Fig. 2 is illustrated a solution of the problem in which an auxiliary device mechanically actuated by both relay armatures is used instead of the auxiliary relay r, this 24 is attracted since in that case the cross arm turns about the pivot 26 toward the side of the fallen arniature. It thus slips below the armature 25 and is. restored to the central position by the springs 27. The arm :23 remains ahovethe attracted armature 24. This latter as it rises and falls from time to time brushes past the arm turning it alittle about the pivot 26 without lifting the Weight g. If the armature 25 is attracted also it passes beneath the left hand arm 22 as well. (In the form of connections according to Fig. 1 both armatures are simultaneously attracted at the beginning so that the weight 9 simply sinks with them.) If now both relays are simultaneously deprived of current, since the cross arm cannot deflect the armatures they carry the weight up with them and close the release contact 15. If on the other hand the armature of B only falls when the armature of A has already returned to the position of rest, the cross arm of g deflectsmnd the contact 15 remains open. This is what happens on the inter-- ruption of the line at contact 4 of Fig. 1.'

In order that the arms 22, 23 may be rengaged when both armatures are simultaneously attracted again after the interruption of the lines as is necessary for the subsequent raising on release above described, the arms are pivoted and spring pressed in such a way that they can deflect downward but not upward if the two armatures press on them with equal force.

Fig. 3 shows another form of the mechanical auxiliary device. In this case the armatures themselves press down a hollow body n sliding frictionally in the guide m when they are both simultaneously attracted. The release contact 15 is thus opened. When the two armatures simultaneously fall back a cross bar pivoted on the rod 0 follows them under t e attraction of spring k and this cross arm striking against the spring projections 11 on body n lift this latter so that contact 15 is closed. This lifting does not occur if the armatures move only one at a time for then the cross bar 1) sets itself in sloping osition. (The rod 0 slides loosely in n.) T e projections 12 are spring mounted in order that the cross rod 72 may again engage under them when the armatures are simultaneously attracted. This corresponds to the pivotal mounting of the arms 22, 23 in Fig. 2.

The invention is not restricted to the form l' t of construction Illustrated for a great number of dlflejrent forms are possible: The

operation of the line relays A. and B inac- 5 cordance with the invention as well as that of the auxiliary relay 1'- or of an equivalent auxiliary electrical device may be. secured not only by the resistance variation of the lines 1,-2- described but also for example b earthing the separate lines so that the inof operation also. r

.I claim 1 In an automatic telephone system: an

vention may be suited to this older method exc ange containing a. selector provided turning magnets over the contacts and armatures of both said relays with the common battery, lines for connecting each subscribers station with the exchange and containin-g in'the latter the said two relays and the common battery, a plurality of subscribers stations each containlng'in series the usual subscrrbers set and a switching apparatus adapted to connect the subscribers lines either directly or over a resistance or to dis- 30, connect said lines, substantially as and for the purpose set forth.

2, In an automatic telephone system an exchange containing a selector provided with a lifting, a turning and a release magnet, two relays coordinated to each subscribers station, a battery common for all relays, conductors connecting the lifting and turning magnets over the contacts and arma tures of both said relays with the common 40 battery, means for opening the circuit of the release magnet of a selector, when one or both coordinated relays attract their armatures and for closing said circuit only,

if the armatures of both relays return simultaneously into their positlon of rest, lines for connecting each subscribers station with the exchange and containing in the latter the said two ,relays and the common batter-y, a plurality of subscribers stations each containing in series the usual subscribers set and a switching apparatus adapted to connect the subscribers lines either directly or over a resistance or to disconnect said lines, substantially as and for the purpose set forth.

3; In an automatic telephone system an exchange containing a selector providedwith a lifting, a turning and arelease magnet, two relays coordinated to each subscribers station, a battery common for all relays, conductors connecting the lifting and turning magnets over the contacts and armatures of both said relays with the com mon battery, a thir relay controlled by said two relays and ad pted to open the circuit of the releabe magnet of a selector when one or both cdordinated relays attract their armatures and for closing said circuit only, if the armatures of both relays return sis multaneously into their position of rest, lines for connecting each subscribers station with the exchange and containing in the latter the said two relays and the common battery, a plurality of subscribers sta tions each containing in series the usual subscribers set and a switching apparatus adapted to connect the subscribers lines either directly or over a resistance or to disconnect said lines, substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence-0f two witnesses.

ERWIN NEUHO-LD. Witnesses:

HENRY HASPER, VVOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing'the Commissioner of Patents,

Washington, D. C.

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