US1081128A - Switching mechanism for telephone-exchanges. - Google Patents

Description

F. A. LUND'QUIST. SWITGHING MECHANISM FOR TELEPHONE EXCHANGES.

APPLICATION FILED FEB. 1, 1905.

vPatetnfited Dec. 9, 1913.

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PIA. LUNDQUIST. SWITCHING MECHANISM FOR TELEPHONE EXCHANGES.

APPLICATION rum FEB. 1. 1905.

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' F. A. LUNDQUIST. SWITCHING MECHANISM FOR TELEPHONE EXCHANGES. APPLICATION FILED EBAl, 1905.

Patented, Ham. 9, 11913.

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P. A. LUNDQUIST. SWITGHING MECHANISM FOR TELEPHONE mun/11mm.

' APPLIGATION FILED FELL, 1906.

Patented Dec.9,1913.

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ymph Leases 27W 1 P. A. LUNDQUIST. SWITCHING MECHANISM FOR. TELEPHONE EXCHANGES.

APPLICATION FILED FEB. 1, 1905;

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ENT OFFICE.

lll'lltlll .h. LWNJDQWTQ -h 01F CHIWAGQ), ltLLINtJIEl, AQ$IGNOR, BY MESNE ASSIGNMENTS, T WESTERN ELEGTMIC CUMPANW, A CURPORATIQN OF ILLINOIS.

SWIICHXNG MEUHANNEH IlOR TELEPHONE-EXCHANGES.

llhpecillcatleu of better-c Yatent.

Patented Dec. 9, 1913.

.typlication theft February 1, 190%. herial No. 243,66t.

To all whom may coeccra lBjclt ltnown that l, l nnnn 1h. lbunnother a citation oi the limited States of America,

and a resident oi Chicago, county ct tjooln and State of lllinois, have invented certain new and useful improvements in Switching ltllechanisins for 'l7elephone-Enchengaa, of which the following ie a specification,

lily invention rclatee to switchi mechatalents for automatic telephon xflh hct and has tor its object improvement and simplification at each devices.

ll-he present device is especially adapte for use in the kind ofexchanges illustrated in my Patent No. 776,524 issued Dec. 6, 1904C,

but its use involves a modification in the preliminary part of the art-angernent. lln that patent it showed main switches and auxiliary switches. There was a main switch for each subscriber, and each main switch had one hunderd pairs of contact hints. This made the switches which were individual for each subscriber large and exlhfilt fi. 'l be ultimate object ot the device of the preterit "application is to substitute tor one hundred such large switches, in the kind of exchange indicated, one hundred small switches each having ten or twelve pairs of contact points, and ten or twelve large switches. The present application is limited to this small switch and its operation.

in the accompanying drawings Figures 1, 2 and 3 are respectively front, side and rear elevations of the individual switches mentioned; Fig. l is a diagram at the mechanical operation; Fig. 5 is a. partial electrical diagram showing the automatic operation; Fig. 6 is a complete electrical diagram; lt ig'. 7 is a section on line 7-7 of Fig. 1; and big. 8 is a section on line li-8 ot' Fig. l.

The switch coneiats ot a pair oi contact matters P and l insulated trom each oth,e.r.

and moved over corresponding sets of contact oints P and P by means at a ratchet whee ll". These contact points are insulatingly held between a plate ll and a bracket h (Figs. 2 and 8) secured to a bridge D between the side plates it). There is a magnet A. for moving" the wheel, and a relay a it aseocieted with it so that when the switch is etarted into operation by an impulse controlled from the subscribers station, the movement automatically continues until it ie Stopped by an impulse automaticallyeeut' t rWgfh a magnet ll. A magnet- C and its relay 0 serve to release the switch so that it they return to its normal position in the "ordinary manner.

Referring to Fig. 4 when the armature il i actuated by the magnet A the pawl A advances the wheel F on which the contact makers P and P are carried as before men tioned. it boldingpawl E prevents a bacle ward movement of the'wheel F until it is released. The pawl A has a tail piece A which normally engages 2; pin A and is thereby held clear of the wheel F so as not to prevent its release. This mechanism, and that hereafter to be described, is held by, and largely between, two side plates D, which side plates are connected together by bridges D The different parts are secured by screws either to the side plates or to the bridges, or to brackets connected to the plates or bridges. The upper ends of the side plates have at the rear upwardly projecting portions D (Fig. El) which. are arranged to fit into suitable sockets in, a framework intended to support a series of similar switches. Secured in a block of insulation D held between the lower ends of the side plaice, are a series of springs D; each of which is adapted to make electrical connec tion with a fixed contact on the framework for holding a series of switches. These things are matters of convenience in the setting up and taking down of switches lo catcd in an exchange. As the operation of the mechanism can be better understood by diagrammatic views than otherwise, rcierence will be had principally to Figs. 1-, 5 and G, which are diagramnmticrepresentations of the mechanism shown in Figs. .1, E2, 3, 7 and S.

When ainiinpulse flows through magnet ll, the arnulture ll engages a hook on the bar B and when the armature released its retractile spring draws down the bar l5. On the upper end of the bar B is a piece of insulation B, the oliice of which is to shift the electrical connections of the adjacent springs when said bar is depressed by armature ll These springs are shown are lying in a horiaontcl position zitthe tops of Figs. 1., 2 and 3. [is will be hereinafter explained, this action breaks the circuit for the magnet A and etops the automatic advance of the switch.

The magnet: G is used for release. lite orill) lid

vided with a hook adapted to engage an arm E secured to the holding pawl E, and

the other end of which is adapted to engage a stationary pin C The joint between C 'case F and C is a friction joint so that C naturally stays inthe position into which it is put by force. I 1

When an impulse flows through C and the armature C is attracted, the bell crank C strikes the pin C and forces the hook on C behind the arm E -lVl1en the circuit is broken through 0, and the retractile spring returns G to its normal positionythe hook draws the arm E inward releasing the holding pawl E from the wheel F. At the same time the'other end of the arm E engages the bar B so as to release it from the armature B thus permitting B and the adjacent springs to resume their normal position.

The ratchet wheel F and contact makers P and P are secured to a shaft F (Figs. 1, 2 and 8), and also secured to the same shaft is an ordinary clock spring located in a spring The release of the holding pawl E (Fig. 4) from the wheel Ii permits the spring in the case F to return the contact n ers to their normal position. When the ne...v operating impulse flows through A its armature strikes the bell crank C and releases its hook from E so that the holding pawl may again engage the ratchet wheel F.

Each switch of this kind in the exchange is connected to a subscribers station by wires at and 39 as shown in Fig. 6. Both the switch andthc station have ground connections. \Vhen a subscriber wishes to start his switch into automatic operation he temporarily closes the connection between his end of the line 4 and ground. A current then flows: X-'l2a-34-station-g1ound -X. This operates the magnet-(I and causes its armature 13 to connect to spring 12. A

This circuit is shown in Fig. 6. As the automatic operation now to be described .can be better understood by separating it from other things, reference may be had to Fig. 5, which figure is especially designed to illustrate this operation.

When the impulse flows through A it advances the ratchet wheel l? and moves F away from 17 permitting 17 to close connec tions to 1G. 'ihc movement of the armature A also breaks electrical connection at 20 and at 30.

The operations so far described are the direct result of the circuit closed by the subscriber at his station. As soon as he breaks this circuit the armature 13 of the relay a falls back and breaks the connection to 12. This breaks the circuit for A, and when the armature A falls back it closes a new ciriiient of A again breaks the c1rcu1t for a at 20. But

cuit for a as follows: X-1-2a 3-4-' l6--17-1819-202l-2223-24-25-- le -X. This again closes the circuit for A at 12 and causes'a new move- This new movementof A the current must not cease flowing through at until A has completed its movement otherwise that movement never would be completed because breaking the circuit through 7 the relay immediately causes a break of the circuit through the operating magnet. To prevent the current being stopped too soon through the relay, the armature 13 closes a branch as follows: from 4 26-27-28 2930-22 etc'. This is held until at the final part of the movement of the armature A the'circuit for the relay (1 is broken at- 80. This break permitsthe armature 13 to fall back and break the circuit for A at 12. This in turn permits the armature A to also fall back to its normal position, in which position it again closes the circuit for the relay. It will be seen from this that the closure of a preliminary circuit for the relay by the subscriber causes the, relay to close a circuit for the operating magnet, and thus in turn to cause a movement 0 the switching mechanism. Nothing further then occurs until the subscriber breaks the circuit he has closed when the relay in turn breaks the circuit for the operating magnet. Nothing electrical then occurs until the ar mature of the operating magnet has reached its normal position when it closes a new circuit tor the relay. This again causes the relay to close the circuit once more for the operating magnet. The operating magnet in turn breaks the circuit for the relay but does not do so until it completes its movement. circuit for the operating magnet, the arina- The relay immediately breaks the f ture of the latter falling back almost simultancously with that of the relay. When the armature of the operating magnet again reaches its normal position it again closes the circuit for the relay thus starting a second cycle of automatic operation.

In still more condensed language, we may say, that the subscriber makes and breaks a circuit't-he result of which is to cause one complete operation of a relay and the magnet'associated therewith. Upon the completion of this operation the magnet-starts a series of interacting makes and breaks with the relay, the two being so related that each causes the other to operate, the successive operations being continuous until stopped by some outside force.' 4

Each time that the armature A is actuated it advances the contact makers, (or

wipers as they are commonly called) P and of a pair of interacting magnets arranged' .to automatically representing an idle line, an impulse will 'fiow from said battery through said point,

trolled by an impulse a third magnet operated by such an impulse, and means by which an operation of the third magnet will stop the operation of the first mentioned magnets.

7. The combination with a battery, two magnets, and connections for said magnets so arranged that upon an initial movementbeing given to one of said magnets the two of them will start upon an automatically continuous series of operations, of a circuit finding contact maker operated by one of said magnets, a third magnet connected in an incomplete circuit for said third magnet, and means by which the operation of said third magnet will stop the automatic operations of the first mentioned magnets.

8. The combination with a battery, two magnets, and connections for said magnets so arranged that upon an initial movement being given to one of said magnets the two of them will start upon an automatically continuous series of operations, of a circuitfinding contact maker moved step by step by the operations of one of said magnets, a third magnet connected in an incomplete ciredit for said third magnet, means by which said contact maker may complete the circuit for said third magnet through any one of a serigs of contacts touched by it in its step by ste movement, and means by which an operat on of the third magnet will stop the automatic operations of the first mentioned magnets.

9. The combination with'a circuit finder.

and a circuit breaker, of two magnets for automatically operating the circuit finder, a third magnet for operating the circuit breaker, means by which the circuit finder completes a circuit through the circuit breaker by way of some one of a plurality of paths, and means by which the operation of the circuit breaker stops the operation of the circuit finder.

10. In a trunk selecting switch, a pair of wipers and a single row of contact points for each wiper, a pair of magnets arranged to automatically advance said ,wipers over their contact points to find an idle trunk, and automatically operating means confiowing over :1 found trunk for stopping said wipers.

11; The combination with a switching mechanismcomprising a pair of wipers and a single row of contact points for each wiper, said rows of contact points being in line with the movements of said wipers, of two magnets arranged to be started into operation by an impulse sent through one of them andalso arranged to keep each other impulse flowing over in continuous operation to advance said wipers to find an idle pair of contact points in said rows of points, and automatic means operating through one of the found points for stopping the operation of-said magnets.

12. The combination with two magnets-sir ranged to act as relays for each other so as to keep each other in continuous operation, a circuit finding contact maker operated thereby,- and a series of circuits successively engaged by by said contact maker through an idle one of said circuits, and means eration of the third magnet will interrupt the interacting operation of the first men tioned magnets;

13. The combination with aseries of circuits, a magnet adapted to be operated by an any one. of said circuits, and a circuit finder adapted to complete connections for said magnet over an idle one of said circuits, of automatically operating means consisting of a second magnet and an associated relay; for moving said circuit finder from circuit to circuit in said series of circuits, and means by which an operation of'said first named magnet causes a stoppage of said circuit finder on :1 found idle circuit. .14..The combination with a series of circuits, a magnet adapted to be operated by an impulse flowing over any one of said circuits, and a circuit finder adapted to complete connections for said magnet over an idle one of said circuits, of other magnets and a source of electric current arranged to automatically move said circuit finder from circuit to circuit in said series of circuits, and means by which an oaeratioii of the first mentioned magnet will disconnect the last mentioned magnets from the source of current to cause a stoppage of the circuit finderon a found idle circui 15. The combination with a ratchet wheel, a magnet and pawl for driving it, and a holding pawl, of wipers carried by said wheel, a telephone line normally disconnected from said wipers, a magnet for auto matically connecting the telephone line to the wipers iipon actuation, and a release magnet arranged to simultaneously release said holding pawl from said wheel and said line from said wipers.

16. A switch provided with contact makers adaptedto make contactin succession with contact points representing idle and busy trunks, a magnet and devices as sociated therewith for automatically advancing said switch stcp-by-step upon the reception of an initiatory electrical impulse, a pair of subscribers lines terminating in disconnected contact springs, other adjacent contact springs provided with conncc' tions to said magnet and said wipers, and a said contact maker, of a third magnet arranged to have its circuit closed by which an opsecond magnet controlled through one of Signed at Chicago, 111. this 28th day of said Wipers and a contact point represent Jan. 1905.

ing an idle lino for shiftin the last named y 1 Contact springs so as to i terrupt the op- FRANK LUNDQJUIS'I' eration of thefi'rst named magnet and to Witnesses:

extend ,the connections of @he subscribers hues to sand wlpers.

A. L. BUCHANAN, C. L. REDFIELD.

Copies of this patent may be obtained for five cents each, by adaressing the Uommissioner of Patents.

Washington, IL 0.

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