US1633684A - Automatic telephone-switching apparatus - Google Patents

Automatic telephone-switching apparatus Download PDF

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Publication number
US1633684A
US1633684A US52731A US5273125A US1633684A US 1633684 A US1633684 A US 1633684A US 52731 A US52731 A US 52731A US 5273125 A US5273125 A US 5273125A US 1633684 A US1633684 A US 1633684A
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Prior art keywords
wipers
shaft
terminals
relay
barrel
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US52731A
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English (en)
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Sengebusch Hans
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AUTOMATIC ELECTRIC ING
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AUTOMATIC ELECTRIC ING
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Priority to US52731A priority Critical patent/US1633684A/en
Priority to FR622750D priority patent/FR622750A/fr
Priority to DEA48635D priority patent/DE475291C/de
Priority to DEA48633D priority patent/DE536560C/de
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Publication of US1633684A publication Critical patent/US1633684A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/14—Multi-position wiper switches having wipers movable in two mutually perpendicular directions for purpose of selection
    • H01H67/16—Multi-position wiper switches having wipers movable in two mutually perpendicular directions for purpose of selection one motion being rotary and the other being parallel to the axis of rotation, e.g. Strowger or "up and around" switches

Definitions

  • My invention relates to step-by-step switching apparatus employed in automatic telephone exchanges, and is concerned, more particularly, with a new and improved switching mechanism of the type commonly It l) known as a selector, that is to say, a switch employed for automatically selecting and making connection with an idle trunk line leading to another selector or to a connector, as the case may be.
  • a selector that is to say, a switch employed for automatically selecting and making connection with an idle trunk line leading to another selector or to a connector, as the case may be.
  • the essential mechanism consists of a longitiildinally and axially movable shaft provided with wipers adapted to engage the terminals of trunk lines which are arranged in terminal. banks in groups in horizontal semi-circular rows or levels.
  • the switch as a whole involves suitable electromagnetically-actuated mechanism for stepping the shaft vertically upwards, thereby positioning the wipers opposite a certain. row of terminals containing the desired trunk or line, whereupon the shaft is moved radially to select the trunk or line within that group.
  • the vertical movement is controlled by the calling subscriber operating the usual calling device and the rotary movement takes place automatically, whi'e in a connector both movements are under the calling subscribers control.
  • the release of the switch is accomplished upon the subscribers abandoning the call and replacing their receivers, whereupon the release magnet energizes causing the shaft to rotate back by force of a spiral spring and to drop then vertically into its normal position by force ofgravity.
  • the shaft or rather, to say, the wipers describe an angular motion, viz, vertically upwards, horizontally within a certain level and back again, during release, along the same paths, each movement being controlled by a distinct and separate magnet.
  • the switch is thus provided with three operating magnets, the vertical, the rotary and the release magnet, each executing solely the respective operation of the mechanism.
  • the principal object of the present invention is to reduce the product-ion cost and the maintenance expenses of'the mechanism by simplifying its operations and, consequently, eliminating sources of trouble.
  • I utilize gravitational force directively controlled by an opcrating magnet which absorbs the current impulses produced by the subscribers caling device and moves a barrel provided with helically arranged steps or notches.
  • the shaft carrying the wipers is provided at its upper end with a cam which is normally resting upon that barrel and advances ververtically downwards by force of gravity.
  • the helically arranged teeth ot the revolving barrel will thereby pass the supporting cam of the shaft, but the cam cannot take hold in any of the passing teeth due to the speed of the barrel and the inertia. of the shaft.
  • the cam attached to the shaft Upon the cessation of the movement of the barrel, the cam attached to the shaft will engage the tooth corresponding to the number of steps taken.
  • the wipers are now positioned opposite the desired level of bank contacts.
  • the rotary movement commences then, automatically in case ot a selector and under directive control in case of a connector.
  • the rotary impulses are delivered to the same magnet as before, and the barrel provided with helically arranged teeth, advances again, in the same direction.
  • the cam secured to the upper part of the shaft is now inserted in one of the teeth, and the shaft follows tlerefore, the rotary movement, advancing the wipers along the contacts of the selected level, to select an idle trunk or a subseribers line, as the case may be.
  • the release of the switch is accomplished by again delivering current impulses to the same magnet and thereby continuing the rotary movement of the barrel and also of the shaft. advancing the wipers along the remaining contacts of the level.
  • a projecting arm, secured to the shalt, will strike a helical runway shortly after the last contact set in a row is passed. and lift the shaft out of attachment with the revolving barrel, i. e., the cam provided at the upper part of the shaft, which tool: hold in a tooth upon termination 01' the vertical movement, will. lisengage that tootl
  • the rotary, r storing operation of th barrel continues while the shaft rests with the projecting arm on the helical runway.
  • T his arm is provided with a pin extending vertically upwards and adapted to be engaged by a release lever, forcing the arm and with it the shaii't, to
  • a spiral spring having one end ecured to the spring housing which is ll a e tachcd to the drum and the other end to a release lever which rests against a stop. stores up energy during the rotation oi the barrel, gradual y increasing the tension, of the release lever against the st op. Th stop will be removed momentarily shortly before the final step is taken by the barrel, i. c., snortly before the larrel completes a. full circle of 360 degrees.
  • the release lever being set free, it will turn under the tension of the spiral spring, and, as has been intimated above, it will catch the pin secured to the projecting lever mounted on the shaft which at this instance is resting upon the helical runway, and carry the shaft up into its normal. resting position.
  • the switch is now ready for subsequent use.
  • Fig. 2 is a side view 01' the switch illustrated in Fig. 1, showing also a cross section of the terminal banks;
  • Fig. 3 illustrates the same switch as seen from the top
  • Fig. l is a cross section ol the barrel and ot the guide and release incchanisn'i shown in the upper part of Figs. 1 and 2;
  • ltl shows a schematic circuit for switch.
  • the shaft 1 is provided, at its upper end, with a cam 2 having a projection 3.
  • a bearing 6 Secured tothe upper plate 4. of the U-shaped switch frame 5 is a bearing 6 as can best be seen in the cross-sectionFig. 4:
  • a member 7 extends through bearing 6.
  • the upper, barrel or drum-shaped, partof member 7 is provided with helically arranged teeth 8 in number corresponding to the levels of the terminal banks.
  • the shaft rests suspended by projection 3 of cam 2 upon the incline 9 of the barrel 7, i. e., just in front of the first tooth.
  • the lower end of member 7 extends through the bearing 6 and has secured to it the spring housing 10.
  • the member 7 is thus adapted to be moved radially but not longitudinally.
  • Inserted in the spring housing 10 is a spiral spring 11 and the release lever 12. loose connection is maintained between the spring housing 10 and the release lever 12 by spiral spring 11 which is secured to the spring housing at its outer end and to the release lever at its inner end.
  • the release lever 12 is provided with a circular groove 66.
  • Two semi-circular washers 67 and 68 shown in Fig. 9, are inserted in said groove and secured to the spring housing 10 by means of a cap 69, as can readily be seen'from drawing Fig. eh
  • This arrangement is provided for lreeping the release lever 12 in its proper place and permits an easy detachment.
  • the release lever 12 cannot take part in the rotary movement of the drum because it rests against a stop 13 of an angular release member 1/1.
  • the spiral spring 11 will, therefore, be wound up during the rotation of drum 7 and gradually increase the tension of the release lever 12 resting against stop 13. i
  • the shaft 1 extends through the barrel 7 and through the release lever 12 inserted in the spring housing. Rigidiy fastened to the shaft by means of screw 15 is the shaftguide lever 16 provided with a pin 17 which positioned in front of the release lever 12. The guide lever 16 is normallyresting against a stop 18.
  • the shaft guide-lever 16 passes stop 18 but takes hold, upon the guide-roller 20 by means of the semi-circular groove 19. By this arrangement, the shaft is smoothly guided in its vertical motion, and proceeds vertically downwards.
  • the shaft extends through the lower plate 24 of the frame and is provided, at its lower end, with a set of wipers designated 25, 26, and 27. The wipers are in this manner advanced vertically and positioned opposite a desired row of bank contacts. Pin 17 secured to the shaft guidelever 16 is, thereby vertically displaced relative to the locked release lever 12.
  • the barrel member 7 is provided with a circular row of teeth indicated at 28.
  • a magnet 29 located in front of the U-shaped switch frame and permanently fastened to it, is adapted, when energized, to attr ct its armature 3O pivoted at 31.
  • This armature is provided with a dog 32 extending towards the circular row of teeth associated with barrel 7, and held in normal position by means of spring with its front part en gaging a tooth. Stop 3% is provided for limiting the movement of the dog 32, and detent 35 for preventing the barrel from falling back during rotation.
  • a cam is permanently fastened to drum 7 provided for operating; the off-normal. spring set 3. The oil normal springs will be operated, i.
  • contacts and 39 will be closed and contacts 4-0 opened with the first step taken by the barrel, the direction of the movement being indicated by the arrows.
  • the olif normal springs Upon the barrel completing a full circle of 360 degrees, the olif normal springs will be operated again and brought into the position shown in the drawing Fig.
  • he armature 30 is also provided with a projecting arm t1 holding an insulated pin l2, which extends through an openin l3 towards a pair of normally closed cons. ts ll.
  • these contacts are located in the circuit of magnet 29 and will produce current impulses for automatically operating the magnet to execute the huntin movement of the wipers after they have been advanced vertically and positioned opposite a certain level.
  • the pin 4-5 is normal y located in front of the restoring lever which is hep in a normal position by spring it with he stop 13 engaging the relea e .a'm l2 and preventing the latter from torl-owing' the rotary motion of the barrel as explained previously.
  • the pin 44 advances with the barrel in a direction indicated by the arrow in Fig. 5.
  • UPON. the barrel tal ing its last step i. e., upon its return to normal, the pin approaches the lever arm lei from the other side, indicated in dots, and lifl'ts the lever momentarily, thereby removing stop 13 and allowing the release arm 12 to eltect the restoration of the shaft in a manner to be presently explained.
  • the semi-circular member G l which is sloping, helically upwards and fastened to he lower plate Ql of the switch frame.
  • one the fastening screws being visi le at 6 s for restoring the switch shatt into its normal llOblclOll, and shall be conveniently termed hclical-restoring-runw: shortly helical runway. I shall next t :cribed these restoring operations, referrparlicularly to Fig.
  • the guide lever 16 advances towards the helical runway 64 and strikes runway shortly after the wipers have lCt'l the last tcrniiinal set off the level. e guide lever 16, criz loi'ce l against the la of the runs.
  • the auxiliary wiper 51 consists of a pair of conductively connected springs extending between the two springs of theprivate or test wiper 25, and is fastened to the shaft 47 by means of an adjustable clamp 52.
  • Auxiliary wipers 53and 54 serve ina like manner for maintaining the connections with the line wipers 26 and 27, respectively, and are, of course, insulated from each other. These latter wipers are secured to the shaft 47 by means of a clamp 55, which is shown separately in Fig. 8.
  • the clamp has a forked projection extending into a groove 56 pro vided upon the line-wiper holder 57 which is rigidly fastened to the shaft 1 by means of a screw 58.
  • the private or test wiper 25 is also rigidly fastened to the shaft 1 .by holder 59 and screw 60.
  • the auxiliary wipers will, as can readily be seen, move up and down in synchronism with the switch wipers, and no interference Wlll occur duringthe rotary movement of the latter.
  • the conductors will be attached to the terminals (31, 6'2 and 63 of the auxiliary private and line wipers, respectively.
  • the switch rests on two circular bars and 71 extending through the lower plates of 'mature 21 closes a circuit for the slow acting the individual switch frame, and having turned down projections extending through the upper plate, where they may be fastened by means of nuts.
  • the rack consists essentially of two angle irons 72 and 73, which are fastened to the uprights in the usual manner. Clamps, such as 74; and 75 are provided for rigidly attaching the circular bars 70 and 71 holding the switch, to the angle irons of the supporting rack.
  • the line terminal banks 76, and the test terminal banks 77 are secured to the bars'TO and 71 as usual, by means of clamps.
  • the switch can be easily removed from its terminal banks and mounted again by merely loosening two nuts securing the mechanism to the circular supporting bars associated with the rack. It will also be obvious from the foregoing, that my improved switch presents many advantages not found in other apparatus.
  • the switch as a whole, as well as each of the parts within a switch, permits easy adjustment because of being readily accessible, and proper operation is insured due to the simplicity of the mechanism.
  • the circuit shown is designed for a switch as described above, where the apparatus works as a selector switch, '1. e., a switch accessible to the subscribers individual line switch or to another selector, and adapted to select an idle trunk in a certain group of trunks, located in horizontal rows or levels, and leading to other selectors or to connectors.
  • a selector switch e., a switch accessible to the subscribers individual line switch or to another selector, and adapted to select an idle trunk in a certain group of trunks, located in horizontal rows or levels, and leading to other selectors or to connectors.
  • the line relay 20 When this switch is taken for use by a line switch or by a preceding selector, as the case may be, the line relay 20 operates over a circuit including its two windings, armatures 11 and let of the switching relay 10, and the trunk conductors 5 and 7.
  • Relay 3O energizes and closes its armature 31, thereby preparing a circuit for the stepping relay 50; at armature 32, the slow relay 30 connects ground to the release trunk conductor 6 and to a junction point between switching relay 10 and a contact of relay, and at armature 33, the slow relay 30 prepares the path for the vertical directive impulses for operating the motor magnet 60.
  • the calling subscriber operates his calling device in accordance with a digit in'the desired partys num her, he interrupts the circuit of the line relay 20. This relay deenergizes a number of times corresponding to the dialled digit, and transmits, at each deenergization, a ground impuls to the motor magnet 60.
  • the first impulse transmitted by the line relay may be traced from ground at armature 13 of the switching relay, armature 21 and its resting contact, upper windir ot the slow acting series rel-a" ll).
  • armature 323 and its working contact off normal springs 'iih vindin a' of the motor magnet 60 to battery. The rclt so relay does not return to normal during the rapid trinsn'iission of impulses due to its sluggish properties.
  • the series relay which is also slow acting, onergizes upon the transmission of the first impulse and attracts arn'iature ll )2 paring a circuit for the stepping; relay 5t), and closes its armature substituting another path for the turthcr transmlsim of impulses, excluding otl' normal springs 70, which opened responsive to the first enerniaation ot the motor magnet (30 and con- .cquent rotation of the barrel member provided with h lie-ally arrangc'l teeth.
  • Off normal sprii gs 72 close also upon the first step of the motor magnet. preparing a cirit the stepping relay 50. This circuit closed from ground armature ll worlrir gr contact.
  • iinerrupter springs 61 operated by the r inagmet winding of the stepping relay to batter upon each d gizat-ion of magnet 60, l the circuit will not produce any changes ring the delivery of the vertical impulses to the motor magnet 60, ex-
  • the motor u'iae'net 6O deenereizes after the last directive impulse and closes its interrupter springs 61.
  • the stepping relay 5O en rgizes now over a circuit including armature 4-1 and locks itselt in a circuit in eluding the interrupter springs 61 off nor mal springs 72 and its own armature 51 and its working contact to ground at armature 32.
  • the stepping relay attracts armature 52. me iarin a circuit for the motor ma i D b net.
  • Ground vill be encountered by test wiper 7G and stepping relay 50 energizes again over a circuit including arn'iaturc 12 and its resting contact armature 31 and its working contact, oil normal springs 72, intcrrupter springs (31 and winding of the stepping relay to battery.
  • a short circuit is connected around the switching relay 10 at too same time, preventing it from energiz- 111g.
  • This short Clf'llll includes ground atarmature 32, viuding of the switching relay 10. working contact and armature 31, rest ing contact and armature 12 to around encountered by the test wiper 76.
  • the stepping relay closes a locking circuit for its own winding.
  • the switching relay 10 Upon energizing, the switching relay 10 connects the trunk conductors through at its armatures 11 and 14, thereby deenergizing line relay 20; disconnects the test wiper '7 6 from the original circuit and connects it directly to the junction point of its own winding and the release trunk conductor 6, at its armature 12; and disconnects ground from the release circuit at its armature 18.
  • the slow acting relay 3O deenergies and removes ground from the release trunk conductor 6 and from the switching relay 10 at its armature 32, and prepares the initiation of the release at its armature
  • the seized switch connected ground to the test conductor immediately upon being taken into use in a similar manner as the present switch by means of a slow acting relay such as relay 30, and this ground is therefore propagated back over the test cond actor and test wiper 7 6 to the release trunk 6 leading to the preceding switch.
  • the switching relay 10 remains in operated position throughout the duration of the call being connected to ground at therelease trunk and to battery in series with the stepping relay 50 over off normal springs 7 2 and interrupter contacts 61. The stepping relay does not operate in this circuitdue to the high resistance of the switching relay.
  • the calling subscriber operates his call ing device in accordance with the remaining digits in the desired partys number, setting the various selectors and finally the connector to establish connection with the wanted line terminals. No change occurs in the present switch during the operation of the subsequent apparatus or during the time the subscribers carry on a conversation.
  • the subscribers replace their receivers at the termination of the call. causing the removal of ground potential from the release trunk conductor and consequent release of the various switches. ⁇ Vhen the ground is removed from the release trunk, the switching relay 1O deenergizes, restoring its armatures to the positions shown in the drawing. The line relay 20 and the slow relay being deenergized at this time, a circuit will be closed for the operation of relay l0 from ground at armature 13, armature 21 and its resting contact, upper winding of relay 40, armature and its resting contact, off normal springs 71, and to battery over the lower winding of relay 40.
  • Relay energizes and attracts its armaturedl, thereby completing a circuit for stepping relay 50, which circuit includes armature 41, off normal springs 72, interrupter contactsfi'l, and winding of relay to battery.
  • relay 50 completes a circuit for the motor magnet from ground at armature 32 and its resting contact, working contact and armature 52,
  • the motor magnet operates and interrupts the circuit of relay 50 at its interrupter contact 61, whereupon relay 50 dcenergizes, interrupting the circuit of the motor magnet 60 at its armature 52. Accordingly, the motor magnet releases also, again closing the circuit of the stepping relay, and the stepping relay in turn, again closes the circuit of the motor magnet.
  • the shaft carrying a cam at its upper end provided with a projection which, at the time engages one of the helically arranged teeth, participates in the rotation and advances the wipers over the remaining terminals in the level, however, without any eifect, due to the armature 31 being open at this time, i. e., the test wiper 76 is on an open circuit and cannot test any of the trunks.
  • the shaft is provided with a guide lever which proceeds towards a helical restoring runway.
  • This guide lever strikes the runway shortly after the wipers have passed the last terminal set in a level and lifts the shaft and with it the projection of the shaft cam out of engagement with the helical tooth on the revolving barrel.
  • the latter continues to rotate and the shaft rests with the guide lever engaging the helical upwards sloping runway.
  • Upon the barrel taking its last step it operates the off-normal contacts as described, preventing any further rotation, and moves a restoring lever momentarily, which releases a special arm.
  • the latter rotates ,under the force of a spiral spring, catches the guide lever of the shaft and moves it upwards into its normal position, along the in cline of, the helical runway.
  • the shaft guide lever and the special restoring arm engage their respective stops, while the projection of the shaft camis again posiill) till
  • an automatic switchin mechanism havin a vertically and radially movable shaft provi ed with wipers, terminals ar anned m horizontal rows a ccssi is to said wipers, an elcctromac net having; only one pawl operated thereby. means including said electromag net and pawl for moving said wipers veri ally to select a certain desired ro v, and tor the). moving! said vipers radially to sei rminals within said row, said moving said 3.
  • said wipers describing cgrees, whenever used for L.
  • An automatic remotely switching mechanism having a shaft.- provided vith wipers, terminals accessible to said wipers, means including a electromag- I Sn controlled remotely controlled switching; mechanism having a shaft provided with wipers, terminals acccssible to said wipers. means including: an ccctromagnet tor ettectin a ton udinal directively controlled moven ent 0. said shr' t executed by force of gravity, l.--:o opentive for auton l a radial movement of said shaft wipers upon certai termin:
  • automatic remotey controlled switching mechanism having, a shaft prr :-d with wipers, terminals accessible to said wipers, means iiiciudingg an electromagnct for eiicctiug a longitudinal dircctivelv controlled movementof said .iliait executed by force oi 'ravitv. said means also operative t'or autoimitically cilcctine a radial movnnent oi said shaft to position said wipers upon certain terminals, and mechanical means operating independently of said CL'i'l')ll1tl; Il1Q for moving said wipers in the same adn l direction into normal position.
  • automatic remotely controlled switching mechanism having a shat't provided with wipers. terminals Zlh'L'L sible to said wipers.
  • means including an e ectromagnet for effecting alone'itudinal dircctively controlled movement of said shaft executed by force of gravity, said means also opera tive for automatically eliectin a' a radial movement of said shaft to position said wipers upon certain terminals. and mechanical means operable indi-ipendenlly of and after said electromagnet has ceased to operate for moving said wipers in the same radial direction into normal position.
  • terminals arranged in groups in horizontal rows, a shaft provided with wipers longitudinally movable by gravitational force to select a certain row and axially mo *able to select terminals within said row, and a single electromagnetic means for controlling and executing the movements of said shaft, including its restoring movements.
  • a plurality of terminals, wipers movable in two dimensions provided for establishing connection with said terminals, said wipers being locked in a normal. position while not in use. and a single electromagnetic means operative for executing the movements of said wipers in estab lishing connection with certain of said terminals and again operative for restoring said wipers to normal position.
  • a setof terminals, wipers resting in a normal position out of engagement. with said terminals, 211K.
  • a single electromagnetic means operative for successively moving said wipers in two dimensions to engage said. terminals and again operative for restoring said wipers to normal position, said restoring movement involving different paths than the setting movement.
  • a single electroinagnetie means operative for successively moving said wipers in two dimensions to engage certain of said terminals, the movement of the tirst dimension being executed by force of gravity but under control of said electromagnetic means, said electromagnetic nleansbeing again operative for restoring the wipers to normal position over ditlerent paths than those employed in the setting movements.
  • a shaft provided with wipers, terminals of trunk lines arranged in groups in horizontal rows accessible to said wipers, a member provided with a. row of helically arranged notches, directively controlled means for moving said member radially to advance said shaft longitudinally by force of gravity to position said wipers opposite a certain row, said shaft being out of engagement with said member during said movement, means on said shaft for engaging said member at the end of said directively controlled movement, means for then operating said member to continue its radial movement to advance said wipers horizontally to select an idle trunk, and mechanical means for restoring said shaft to normal position.
  • a shaft provided with wipers, terminals arranged in groups in horizontal rows accessible to said wipers, a radially movable member provided with a circular row of teeth, said member being operable under directive control for effecting a longitudinal movement of said shaft executed byforce of gravity to position said wipers opposite a certain row and also operable automatically for effecting an axial movement of said shaft to position said wipers upon certain terminals within said row, and again operative for restoring said shaft to normal position.
  • a shaft provided with wipers, terminals arranged in groups in horizontal rows accessible to said wipers, a radially movable member provided with a circular row of teeth, said. member being operable under directive control for effecting a. longitudinal movement of said shaft executed by force of gravity to position said wipers opposite a certain row, and also operable automatically for effecting an axial movement of said shaft to position said wipers upon certain terminals within said row, and again operative for restoring said shaft to normal position, said wipers describing a circle of 360 degrees.
  • a shaft provided with wipers, terminals arranged in groups in horizontal rows accessible to said wipers, a radially movable member provided with a circular row of teeth, said member being operable under directive control for ellecting a longitudinal movement of said shaft executed by force of gravity to position said wipers opposite a certain row, and also operable autoimitically for effecting an axial movement of said shaft to position said wipers upon certain terminals within said row, and again operative for initiating the restoring movement of said wipers to normal position, said restoring movement taking place over different paths than the setting movement and involving n'icchanical means operative independently of and after said member provided with circular teeth has restored to normal.
  • terminals, wipers movable in two dimensions and nor mally resting out or engagement with said terminals a single motion operating member, a device for storing up mechanical ten sion, means for operating said member to store up energy in said device and to move said wipers into temporary engagement with terminals. and means controlled by said member For releasing said energy to effectthe restoring movement of said wipers.
  • a switching 1110(l1i11'1l51'11, terminals, wipers movable in two dimensions and non mally resting out of engagement with said terminals a single motion operating member, a device for storing up mechanical ten sion, means for operating said member to store'up energy in said device and to move said wipers into temporary engagement with terminals. and means controlled by said member for releasing said energy to effect the restoring movement of said wipers, said wipers describing a circle of 360 degrees whenever used tor establishing a connection.
  • terminals arranged in groups in horizontal rows.
  • a shaft provided with wipers longitudinally movable to select a certain row and axially movable to select terminals within said row, a radial y movable member for controlling the movements of said shait including the. restoring movement, a lever arm. a spiral. spring associated with said member and said lever arm.
  • terminals vertically and horizontally movable switching members tor cstabli ling temporary connections with said teiziiinals. said members resting in a normal position out of engagement with said terminals-2.
  • a member provided with a circular row of teeth movable only radially in one direction for controlling the mov nents o'l said. wiper: a lever arm, a spiral spring attached to said member and said lever arm.
  • an operating device means for actuating said device to move sa d wipers into temporary engagementwith terminals.
  • a switching mechanism tern'iinals, wipers movable in two dimensions and normally resting out of engagement with said terminals, an operating device, means for actuating said device tomove said wipers into temporary engagen'ient with terminals, a helically ascending guide track, and mechanical means operatively effective to the exclusion of said operating device for restorii'ig saidhvipers to normal position along said guide track, said restoring movement involving different paths than the setting movement.
  • terminals In a switching mechanism, terminals, wipers resting in a normal position but out of engagement with said terminals, and means operative for moving said wipers successively in two dimensions to temporarily engage terminals and again operative to restore said wipers to normal position in a continuous helical motion, said wipers describing a circle of 360 degrees.
  • terminals In a switching mechanism, terminals, wipers resting in a normal position but out of engagement with said terminals, and means operative for moving said wipers successively in two dimensions to temporarily engage terminals and again operative to re store said wipers to normal position in a continuous helical motion, said restoring movement being in a direction continuous to the setting movement.
  • terminals arranged in groups in horizontal rows, a plurality of movable stops, a shaft provided with wipers and resting in a normal position suspended on one of said stops, means for successively moving said stops with relation to said shaft, said shaft moving vertically by force of gravity in accordance with the movement of said stops and engaging at the termination of said movement the stop corresponding to the number of steps taken, positioning said wipers opposite a desired row, said means again operative for moving the stop engaged tosaid shaft to advance said wipers horizontally within said row to select terminals.
  • a switching mechanism terminals arranged in groups in horizontal rows, a plurality of helically arranged stops, each corresponding to a certain row, provided on a circular radially movable member, a. shaft carrying wipers and resting suspended upon said member in a normal position preceding said stops, means for moving said member to displace said stops relative to said shaft for advancing said shaft vertically by force of gravity, said shaft engaging at the termination of said movement the stop corresponding to a certain row, positioning said wipers opposite thereto, said means again operative for moving said member to operate said shaft radially to advance said wipers to engage certain terminals within said row.
  • terminals arranged in groups in horizontal rows, a radially movable member provided with helically arranged stops one for each row, a shaft carrying wipers and resting suspended upon said member in a normal position preceding said stops, ineans for moving said member under directive control to successively advance said stops with relation to said shaft for moving said shaft vertically by force of gravity, said shaft at the termination of said directive movement engaging the stop corresponding to a certain row posi tioning said wipers opposite thereto, said means then operative for moving said meniber automatically to successively advance the stop engaging said shaft to move said wipers into engagement with certain terminals within said row.
  • av wiper set having a plurality of wipers rotatable through arcs of 360 degrees in each of a plurality of planes, and means for maintaining a continuous electrical connection to said wipers.
  • a wiper set rotatable in a continuous direction in each of a plurality of planes, and means for maintaining a continuous electrical connection to said wiper set.
  • a shaft carrying wipers means for moving said shaft longitudinally and for rotating it through an arc of 360 degrees, and means for maintaining a continuous electrical connection to said wipers.
  • a shaft carrying wipers means for moving said shaft longitudinally and for rotating it through an arc of 360 degrees, a second shaft parallel to the first and movable longitudinally with it, and means on said second shaft for maintaining a continuous electrical connec tion to said wipers.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Transmission Devices (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US52731A 1925-08-27 1925-08-27 Automatic telephone-switching apparatus Expired - Lifetime US1633684A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US52731A US1633684A (en) 1925-08-27 1925-08-27 Automatic telephone-switching apparatus
FR622750D FR622750A (fr) 1925-08-27 1926-08-26 Sélecteur à gravité
DEA48635D DE475291C (de) 1925-08-27 1926-08-28 Waehler fuer Fernsprechanlagen, dessen in mehreren Richtungen bewegliche Kontaktarme bei der im Sinne der Einstellbewegung erfolgenden Ausloesung einen vollen Umlauf ausfuehren
DEA48633D DE536560C (de) 1925-08-27 1926-08-28 Waehler, insbesondere fuer Fernsprechanlagen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52731A US1633684A (en) 1925-08-27 1925-08-27 Automatic telephone-switching apparatus

Publications (1)

Publication Number Publication Date
US1633684A true US1633684A (en) 1927-06-28

Family

ID=21979541

Family Applications (1)

Application Number Title Priority Date Filing Date
US52731A Expired - Lifetime US1633684A (en) 1925-08-27 1925-08-27 Automatic telephone-switching apparatus

Country Status (3)

Country Link
US (1) US1633684A (de)
DE (2) DE536560C (de)
FR (1) FR622750A (de)

Also Published As

Publication number Publication date
DE536560C (de) 1931-10-24
DE475291C (de) 1929-04-23
FR622750A (fr) 1927-06-04

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