US1242009A - Impulse-control system. - Google Patents

Description

A. E. LUNDELL.

IMPULSE CONTROL SYSTEM.

APPLICATION FILED MAY 25. I916.

Patented Oct. 2, 1917.

)M A. A Z n w). m5 w A b ALBEN E. UN' ELI or new YORK, 1\T.-Y., nssreuon To WESTERNEELECTRICI COMPANY, INCORPORATED, OF'NEW' Y0ItK,-1 T. Y2, Axconronarro tor nnw YORK.

IMPULSE-CONTROL SYSTElVL 4 To an whom it may concern:

Be it known that I', ALBEN E. LUNDELL, a citizen of the United States, residing at New York, in the countyfof Bronx and State of New York, have invented certainnew and pulse control systems'for selector switches in automatic telephone exchanges.

The lines and ltrunks in automatic telephonesystems beingarranged in groups, the I automatic selector switches are equipped with means for primarily selecting a desired group and then for selecting, during a secondary movement, an idle line in the selector *rciu'p. The primary motion of the switch 18 controlled by an, impulse mechanism, and in order toinsure the change-over from the primary operationof the switch to the secondary operation, a timing device, such as a slow-acting relay,ris'provided inassociation with the switch. Thisrelay does not respond -to the operations of the primary impulse receiving means associated with the selector, but becomes actuated uponthecessationof the primary impulses, andf causes the switching out of the, primary'and the switching in of theflsecondary [operating means? V v V t It is the object of this inventionctorprovide an, impulse controlling system in which thenecessity ,of providing sucha timing device for controlling the change-over from the j'prima'ry to the secondary operation of thej'selector switch, is obviated.- .Y

' With this 'object in view this invention provides a system in which the" electromag netic means controlling the I primary 5 opera-- tion of the selectorswitch is conductively associated Withthe impulse circuit, and the electromagnetic means controlling the] sec ond liy operation of the selector switch is inai tively united? with but. ,conductively Separa ed vfr i mrirr "Figural is a diagram 'matic' v phone exchangesystem embodying the presentfinventiom only so much being shown of thefbircuits iland c apparatus as is necessary foria' clear u'nder'st'anding'of thepresent invention.

iew of aftele Specification of Letters IPatent. Patented Oct 2, 191 7; 1 Application filed May 25, 1916. Serial No. I i

rent changes; produced the impulsesendlvngljclrcuvlt'vl A Y The'calll'ng.dev1ce, 'by'meansof which an impulse receiving relay 10 and'ia 'changeover relay '12 maybe controlled, is'rfe'pre sented at 11. The callingjdevice' comprises a "dial "1'13, provided with a pluralityof fingenholdsi 14', by means Qf-Whichi the dial may'be'fmove d towardc afstationarylstop 15.

Upon the' release ofthe' diaha motor'spring,

(notfshown) wound during the forward movementfof the" same, causes the return of the dial, and during this return movement,

aip'a wl 16, pivoted on an; arm 17 of dial 13 engages the ratchets of a Wheel 18 and causes t to rotateWith the dial. The ratchet a wheel :18, throughthe agency, of a gear wheel 19, causes an armQO to travel over a commutator 21 in the direction indicated by the arrow, theTatio between the movement of the arm 20 and the dial 13 being'such that for each finger-hold by which the dial l8 has been displaced, the arm 20 will'perform onecompleterevolution; The dial is sojadjusted thataninsulated lug 24 on member 17causes the closure'pf a contact 25 prior to. t e g ment pf. Se men O mutator2l, by anti 20. Upon the removalof the receiver from the switchhoolg at; 'substation 27, a circuit is closed f roml grounded battery through the windingof relay 10, the primary winding. of

an indulction'coilj28, aside sw-itchwip'er 29, conductor 30," the substation circuit, conductor 31, contact. 25, conductor 32, and a side-'switch'wiper 33 to ground Due to the infinitely high kresistance of this circuit prior to its closure, no current is flowing in the same." :Upon'thesudden closure of the circuit at thepontacts', of the hook switch, the 'esi'stanc e' ofthe; circuit will he suddenly reld d, ei ldfthe; surge of current thus prodill d in. the circuit, will cause the induction bffs uifisient""current through the secondary W nding-1' k nductie T1 10 2 c use th energization ofrelay 12 g 'lhejresistance of his u se ir fb ma ntai ed t am p int, .ithwmou Of 'cilrltsntf owi in itlfifs time willme mainth a116,: an

the; op ning 10 s u'itrq u th witch wiper to move-into position These changes of current in the circuit are indicated in Fig. 2, to the left hand of a dotted line 35.

The calling subscriber now inse-rts his finger into the finger-hold 1%, representing the desired number of digits, and moves dial 13 until his finger reaches the stop 15. When the lug 24- disengages spring 36, contact 25 is opened. The above traced circuit, however, remains closed through conductor 37, segment 26 of commutator 21,

7 46 into the impulse sending circuit, causing thus, the gradual reduction of current in this circuit until a segment 17 is reached, when the circuit is opened, and thus the current flowing therein is zero. Arm 20 then continuing its rotation, includes into the circuit decreasing portions of resistance 46. through segments 18, causing the grad ual increase of current in the impulse sending circuit. The wavelilre changes of cur rent, which are represented in'Fig. 2between dotted lines 35 and 49, are gradual,

and therefore the current induced into the ci'rcuit of relay 12 will not be of sufficient strength to energize this relay.

lVhen the current reached a sufficiently low value, relay 10 became deenergized and opened the circuit of a primary magnet 50, which caused the stepping of the wipers of a selector 51 in a primary direction. This operation of sender 11, relay 10 and magnet 50 will be repeated as many times as predetermined by the number of digits selected and when the current in the impulse sending circuit reaches the zero point for the third time, arm 20 being in engagement with segment alarm 17 of dial 13 engages spring 86 and causes the closure at contact point 25 ofthe originally traced circuit of relay 10, producing a sudden change of 're sistance, which will result in. the induction of suflicient current in the circuit of relay 12 for operating the same. Arm 20 returns to its normal position without causing any further efiect on the impulse sending circuit. Upon thede'e'nergization of relay 12, which shortly followsits energization, sideswitch magnet 84. again becomes deenergized, and by moving the side-switch wipers into position 3, causes the connection, of an' interrupter in circuit with a secondary magnet 71, which controls a secondary or trunk-hunting motion of selector switch 51.

While a test wiper. 72 is traveling over grounded, e. busy, terminals, side-switch magnet 3 1 will be maintained energized, and when an idle terminal is reached, this magnet becomes deenergized and moves the sideswitch wipers into position 4, disconnecting, thus, the secondary magnet and connecting conductors 30 and 32 to the wipers of selector 51.

. Upon the termination of the conversation, an impulse is sent through wiper 7 2, conductor 75 and the winding of a release magnet 76 for operating the same. The release magnet causes the restoration of selector 51 and the associated side switch. 77 is an offnormal contact of selector 5L During the as applied to a telephone system in which the selector switches are controlled under the directive control of animpulse-sending device, it will be obvious to those skilled in the art that it is applicable to impulsesonding systems of widely varying character, such as revertive-impulse systems, in which the selector rather than the impulse device causes'the sending out of impulses. It will be further apparent that instead of an induction coil, other well-known apparatus, such as a condenser, may be employed for inductively connecting but conductively separating the relay 12 and the impulsesending circuit.

Vhat is claimed is: I

1. In a telephone exchangesystem, [an incoming line and groups of outgoing lines, a selector switch, an impulse sender associated with said incoming line, means con trolled by said impulse sender for producing wave-like current fluctuations in said in coming line, means responsive to said current fluctuations for causing said selector to select a desired group of outgoing lines, means controlled by said impulse sender for producinga sudden change of resistance in said incoming line, and 1neans operative thereupon for causing said selector to hunt for an idle line in said selected group ofout gomg lines. o

2. In a telephone eXchange'system, a I- i in coming line andgroups of outgoing lines, a

selector switch, an ele'ctromagnetic means for controlling said switch to select a group of outgoing hnes, another electromagnetic 7 Copies of this patent may be obtained for means for controlling said switch to seize a line in the selected group, switching means for controlling the successive operation of said electromagnetic means, a relay inductively associated With said incoming line,

means. operable through said incoming line line and operable therethrough for control-' ling said selector to seize a group of outgoing lines, and another electromagnetic means inductively associated with said incoming line and operable therethrough for causing said selector to hunt for an idle line in the selected group of outgoing lines.

4. In a telephone exchange system, a plurality of subscribers stations, a selector switch arranged to establish a connection from one of said stations toward another station in accordance with the group and line designation of said latter station, a cir-.

cuit extending from the calling station to said selector switch, a relay included in said circuit for controlling the group selecting operation of said selector, and a relay inductively connected to said circuit and operable tlierethrough for controlling the line selecting operation of said selector.

5. In a telephone exchange system, a calling and a called station, a selector switch arranged to perform a primary and a secondary operation to interconnect said sta-v tions, a circuit between said calling station and said selector, electromagnetic means included in said circuit for causing the primary operation of saidselector, and another electromagnetic means inductively Connected to said circuit and operable therethroughfor controlling the secondary operation of said selector.

6. In a telephone exchange system, two telephone stations, a selector switch'for interconnecting said stations, electromagnetic means for controlling a primary operation, and another electromagnetic means for con-' trolling a secondary operation of said selector switch, a circuit extending from the calling station to said selector, means for producing wave-like current changesand means for producing sudden changes of resistance in said circuit, means for operating 7 said first mentioned electromagnetic means in accordance with the wave-like current changes produced in said circuit, and means for operating said second mentioned electromagnetic means in accordance with the sudden changes of resistance produced in said circuit.

7 Incombination, a selectively operable switch adapted to perform a primary and a secondary motion, a controlling circuit forv said switch, an electromagnetic means at said switch for controlling said primary motion conductively connected to said circuit, and another electromagnetic means at said switch for controlling said secondary motion inductively connected to said circuit.

In witness whereof, I hereunto subscribe my name this 24th day of May ALBEN E. LUNDELL.

Washington, D. G.

five cents each, by addressing the Commissioner of Patents,

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