US1103040A - Automatic switch for telephone systems. - Google Patents

Description

A. H. DYSON. AUTOMATIC SWITCH FOR TELEPHONE SYSTEMS. APPLICATION FILED MAY 5, 1911.

Patented July 14, 1914.

2 SHEBTSSHEET l.

i2 WMBWWW 5270222557;

A. H. DYSON. AUTOMATIC SWITCH FOR TELEPHONE SYSTEMS. I APPLIGATIOH FILED MAY 5, 1911. 1,103,040, Patented July 14,1914.

2 SHEETS-SHEET 2.

stares PATENT OFFICE.

ALFRED H. DYSON, OF CHICAGO, ILLINOIS, ASSIGNORTO KELLOGG SWITCHBOABFD' SUPPLY COMPANY, 01'' CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOIvIATIC SWITCH FOR. TELEPHONE SYSTEMS.

rnoaoao.

Specification of Letters Patent.

Patented J uly re, Ii

Original application filed July :20, 1905, Serial No. 270,492. Divided and this application filed may 5, 19753.

- Serial No. 825,280.

To all whom it may; concern:

, Be it known that I, ALFRE H. DYSON, a citizen of the United States, resident of Chica'go, county of Cook, and State of Illinois, have invented new and useful Improvements in Automatic Switches for Telephone Systems, of which the following is a specifica- -tion.

The present invention relates to automatic switches for telephone systems and particularly to that type of switch in which the bank contacts are divided into groups and inwhich cooperating wipers are first given a primary adjustment to select a group of contacts in the bank and thereafter given a secondary adjustment to select a contact in a group, an object being to. provide av device of this sort which shall be certain and eflicient in operation, readily adaptable to adjustment and comparatively simple in con struction.

The present application is a division of: my application, Serial Number 270,492, filed July 20, 1905, entitled Telephone systems.

The invention, herein claimedis for an automatic switch adapted for use with the circuits illustrated and described in the application above referred to, of which the present case is a division.

I have not illustrated herem a clrcuit arrangement for operation in connection with I the automatic switch of the present application, but reference may be. had to the above identified application, for such a circuit arrangement as is adapted for use with the switch of the present application.

The many features and advantages of the automatic switch herein described will be better understood upon reference. to the following detailed description taken in connection with the accompanying drawings.

Referring to the drawings, Figure 1 is a side elevation of the automatic switch of my invention. Fig. '1 is a plan view of the power storing mechanism mounted upon the top of the frame of the switch. Fig. 1 illustrates more in detail the secondary magnetand release magnet together with their cooperating mechanism. Fig. 1 is an end View. of the primary and secondary magnets 11 and'S respectively together 'ith heip'cooperating escapement wheels. Fit- Pillustrates the primary magnet '8 and its cooperating escapement wheel. Fig. if is a view the mechanism which normally loclcs t: wiper shaft against rotation. Fig. i shows the radial disposal of the wipers upon the wiper shaft together with one of the groups of bank contacts. I

Referring first to Fig. 1, the switch there shown is adapted to be operated by means of escapement movements; shaft 1, when the switch is in itsidlr or normal position, has ing a tendency to revolve, due to its being attached to motor-spring 3'7. Upon the lower portion of shaft 1 are rigidly mounted thirty wipers in sets of three, A A, A etc.; B",.B", etc.; C", C", etc.; those having the same coefficient constituting a set. These wipers are insulated from each other and are disposed radially by sets, with respect to the shaft. Adapted to be engaged by these wipers are thirty sets of curved rows, of immovable contacts, of which a sectional View is shown in Fig. 1, each row being provided with a common strip extending beneath and parallel to it. The said contacts are mount-- ed in three banks in horizontally curved rows.

A. top View of thewipers and Contact banks is shown in Fig. 1, a being the com-- mon terminal. When shaft lis caused. to rotate from left to right, wiper A passes over-the horizontal curved row of contacts of. Then the said wiper has revolved a dis. tance such that it assumes the position of wiper A", as shown in Fig. 1, wiper A is re. a position, with respect to the vertical of the contact bank, similar to that of wiper A shownin the illustration. The shaft continuing to revolve, wiper A. passes over the lowest curved row of contact points c". \Vlien the said wiper has passed over the last of said contact points, the shaft eontiir uing to revolve, wiper A engages the contact at the left of row uF; and when said'wiper has left the row, wiper A} leegins passing over the contacts of its apprapriate row. It will be seen that one complete revolution of the shaft 1 will cause Elt ating the switch, a number of primary r0- tary movements of the shaft are allowed, depending upon the level of immovable contracts with which it is desired to connect. Each of these first movements is suflicientto move a set of wipers entirel acrossits respective rows of contracts. hen the desired set of wipers is, in this manner.

brought, with respect to its contact banks,

to a position corresponding to that of wiper A, as shown in 1, a number of secondary rotary movements of the shaft in the same direction are allowed, to move the sa-id desired set of wipers from contact to contact of its rows, each movement causing the wipers to close contact between shccessive contacts and their commons, the movement of the wipers being arrested when the proper contacts are engaged by them.

To secure the return of the switch to normal, the shaft is allowed to complete the revolution upon which it has been started, its movement being arrested as soon as the revolution is completed. Upon such completion, apparatus is automaticall brought into play to cause spring 37 to be wound up, preparatory for a further use of the switch. It will be noted that each time the. switch is operated and returned to normal, each contact in the different banks is wiped by its appropriate wiper, and this is believed to be a new and valuable feature of a switch of this character, inasmuch as the accumulation of dust upon contacts and wipers is prevented and they themselves kept, at all times, bright and clean. 7

The movements of the shaft are controlled in the following manner, reference being bad to Fig. 1: One or more impulses of current are first caused to flow through primary magnet 8, depending upon the contact levels to be selected. Each impulse of current causes the attraction and relase of armature 9. Mounted upon shaft 1 is a disk 4,-having a single tooth in its periphery which, as

shown in the illustration, is engaged by de-' tent 15, preventing movement of the shaft. Arm 10 mounted upon armature 9 (the end of which is illustrated as broken) extendsdownward so as to overlap'arm 14 mounted upon armature 12, its lower end being on a. level with the lower end of. arm 14, this being shown complete in Fig. 1. The first attraction of armature 9 causes arm 10 to press against the projection shown upon detent 15, causing the said detent to move out of engagement with the tooth upon disk 4, so that the detent 1 no Ion er restrains movement of shaft 1. Mounte upon armature 9 is detent 5 which, upon the attraction of the armature, presses against the circumference of circular ratchet wheel 2 rigidly attached to shaft 1, arresting movement of the shaft when it has rotated the distance from one tooth of ratchet wheel 2 to the tent of these movements is so gaged as to bring successive sets of wipers to positions in front of, but not engaging, the first contacts of their respective levels.

Fig. l is a top view of ratchet wheel 2, detent 5 being shown in the normal position. 3 is a second ratchet wheel rigidly attached to shaft 1, its teeth bein so spaced that successive movements, as determined thereby, allow movements of the wipers from contact to contact only.- Normally en aging the said ratchet wheel 3, is detent 7, havin upon it a projection adapted to be engaged by arm 10 upon armature 9 with each attract-ion of the said armature, and moved out of engagement with ratchet wheel 3 and so held as long as the armature is attracted. With 'a tooth of wheel 3 and arrests rotation of the shaft. The rows having b tien selected in the manner described, one or more'impulses of current are now caused to flow throu h secondary magnet 11, depending upon t e proper contacts in the rows. Each impulse causes the attraction and release of armature 12 which controls detent 6 in a manner gen erally similar to that in which detent 5 is controlled by magnet 8, the shaft being permitted to rotate one step for each impulse. Detent 7, with each energization of magnet 11, is caused to release ratchet wheel 3 by the operation of arm 13; and upon the deenerglz'ation of the magnet, again engages the wheel, preventing movement of shaft 1. Fig. 1" is another view of the arrangement of these parts. Upon armature 12 of'magnet' 11, is shown arm 14, adapted to cause the retraction of detent 15, should the detent bein its normal position at the time magnet 11 is energized. This is necessary to enable wipers A", H and 0 to be controlled by magnet 11 in a from-contact-to-contact movement, inasmuch as a complete revolution of the shaft is required to bring the said wipers into positions where they may be controlled by magnet 11. In'other words, ten impulses or current are sent through magnet 8 to-bring the zero wipers into operative position, thus constituting a complete revolution and causing engagement of disk 4 by detent 15.

Referrin now to Fig. 1, when magnet 16 is energize pawl 21-, pivotally associated with its armature 20, moves downward, em,

ga ng the next tooth of ratchet wheel 26.

en the magnet is deiinergized, armature 20 is retracted and pawl 21 moves in a vertical direction, causing ratchet wheel 26'to revolve one ste from left to right. The said ratchet whee is rigidly attached to ratchet wheel 27 moving the latter with it, and the .end of lever 2'2 1S moved out of engagement mean-so with the tooth of ratchet wheel 27, previously engaged by it, and rests upon the pcriphery of the wheel. The saidlever being mechanically connected to circuit changing spring 29 as shown, this movement causes the said spring to disengage spring 28 and to engage spring 30. Lever 27 may be mechanically attached to, and cause simultaneous movements, of, a plurality of circuit changing springs. When release magnet 22 is ener ized, its armature. 2-3 is attracted. rivotally associated with the said armature is pawl 24, engaging a tooth of ratchet wheel 26, the pawl upon the attraction of armature v23 moving toward the left, revolving ratchet.

wheel 26 one step and thereby moving ratchet wheel 27 into such a position that lever 27 again engages vwith its end a tooth of ratchet wheel 27, adjacent to that from engagement with which it was moved by the above described operation of pawl 21. This operates to move the circuit changing spring 29 out of engagement with spring 30 and again into engagement with spring 28, its normal position. The attraction of armature 23 also moved arm toward the left in such manner that an orifice toward its projecting end is caused to slip over and en- 3. The disengagement of detent 7 in the manner described operates to restore the wipers to normal by allowing a free rotation of the shaft, until detent 15 engages the single tooth of disk 4.

Referring to Fig. 1, 31 illustrates (viewing it from in front) an arm of considerable length, extending from the rear of the switch to shaft 1 at all times.

and engaging, with one edge a disk fastened When the shaft is in its normal position, as shown in Fig. 1,

the edge of arm 31 engages a depression or flattened portion 31 in the periphery of disk 31", as shown in Fig. 1, and, in this p0. sition the arm 31 engaging the projection:

shown upon arm 25, holds the said arm above the pin on detent 7. With the first rotary movement of the shaft, the edge of arm 31 disengages the depression'mentioned, and rests upon the periphery of the shaft; its end, under these circumstances, being moved to the right so that it no longer supports arm 25 in the position shown in Fig. 1. It is retained thus retracted until the shaft has completed one revolution. When this occurs, its edge again engages the depression in shaft 1 before mentioned; its end moves forward and lifts arm 25 out of en- 'gagement with'detent 7 in which it was placed to release the switch, so that the said detent again engages ratchet wheel 3. This, it will be noted, occurs at the termination of the release operation before described and simultaneously with the engagement of detent 15 with disk 4, detent 7 being thereby returned to normal and ready to perform its usual function upon the next operation of the switch.

The means bywhich spring 37- is wound up after the return of the wipers to normal will now be described. The details of the mechanism used for this purpose are shown in detail in Fig. 1 Attached-to the upper portion of shaft 1, is a cam 36 having an off-set, as shown in Fig. 1, normally engaged by pawl 38. As the shaft is revolved,

cam 36 gradually moves pawl 38 to the left;

and when the shaft approachesthe comple- "tion of its revolution, pawl 39, attached to and moving with pawl 38, engages a tooth of ratchet wheel 41 adjacent to that previously engaged by it. As soon as the revolution of the shaft is completed, pawl 38 engages the off-set in cam 36, its free end moving toward the center of the shaft and retracting pawl 39 to move ratchet 41 one step from left to right. Ratchet 40 is rigidly attached to ratchet 41 and moves with the latter, the end of spring 43 (see Fig. 1 being moved out of its engagement with a tooth of ratchet 40, which is its normal position, in such a manner thatit rests upon the periphery of the said ratchet. Spring 43 is thereby caused to engage spring 42, and this closes circuit through winding magnet 32. The said magnet is arranged in a vibratory circuit, a novel form ofcircuit breaker being provided consisting of disk 46'.

(see Fig. 1) and its associated parts. This circuit breaker is designed to secure a full stroke. of the armature of magnet 32 before the magnets circuit is broken, and operates ,in the following manner: The energizing circuit of magnet 32 passes through contact 47-48. Upon disk 46 is provided a depression 46 engaged by one end of armature 33, and a second depression 46 adapted to be engaged by lever 46. When armature 33 is attracted, its end, engaging depression 46, moves upward, and as the full stroke of the armature is completed, it impacts upon the upper edge of depression 46. This causes a slight rotary movement of disk 46 from left to right, and lever 46 is thereby causedto move out of the position shown in the illustration into depression 46, breaking the circuit of magnet 32 by opening contact through springs 47 and 48. Magnet 32 isthereby denergized, and its armature 'is'retracted by spring 33 to the position shown,

the end of the armature engaging'the lower edge of orifice 46 and moving disk 46%; short distance from right to left so that lever 46 again rests upon the peripheryof the disk,

pendently of shaft 1, and the shaft remaining motionless under these conditions. One end of spring 3? it attached to ratchet 34 and the movement of freely moving ratchet 34 is in the same direction as the movement of the shaft when the switch'is operated.

This movement of ratchet 34, therefore, op- 15 crates to .wind up the said spring. Mounted upon ratchet 34 1s cam 35 (Fig. 1), its shape being similar to that of cam 36, being provided with an oif-set normally engaged by pawl 38. The described windin movement of ratchet 34 moving cam 35 with it, gradually moves pawl 38 to the left; andwhen ratchet 34 approaches the completion of its revolution, pawl 38 causes pawl 39 to engage the next tooth of ratchet 41'. 'When armature 33 has been vibrated a suflicient number of times to cause a complete revolution of ratchet '34, cam 35 will also have made a complete revolution and pawl 38 again. en gages its olf-sct. Pawl 39 then moves to the right and effects a rotary movement of ratchet 41 one step from left to right. It

Will be noted that this is the second movement of ratchet 41 accomplished in the winding operation, and this second movement opcrates to bring ratchet 40 in such a position that spring 43 moves from the Periphery of the ratchet into engagement with the tooth next to that engaged by it before the wind ing operation commenced. This engagement causes spring 43 to disengage spring 42 and opens the circuit of magnet 32, preventing further operation of the'said magnet. All operating parts of the switch have now returned to normal, and energy has-been stored for operating the switch a second time.

Although I have worked out my invention in commercial form and illustrated and dedescribed it as such, I contemplate many changes and modifications thereof, and I do not wish to be limited to the structure as shown and described, but aim to cover all such changes and modifications as come within the spirit and scope of the appended claims.

1. In an electrical switching mechanism, the combination with passive switching contacts arranged radially in rows, of movable contact arms for making connection with said cont-acts, one for each row, means for suitably supporting said arms whereby they are adapted to be moved to wipe successively their respective rows, and apparatus for.

moving said arms to wipe a portion of said contacts to cause an arm to select a contact of its row.

2. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of movable contact arms for making connection with said contacts, one for each row, means for suitably supporting said arms whereby they are adapted to be moved to wipe successively their respective rows, apparatus for moving said arms to wipe a portion of said contacts to cause an arm to select a contact of its row, and apparatus for moving said arms to wipe the remainder of said contacts to return said arms to normal.

3. In an electrical switching mechanism, the combination with immovable switching contacts arranged in rows, of movable contact arms for making connection with said contacts, means for causing said arms to wipe a portion of said rows to select arow,

and apparatus fir causing an arm to wipe along its row to select a contact.

4. In an electrical switching mechanism, the chmbination with immovable switching contacts arranged in rows, of movable contact arms for making connection with said contacts, means for causing said arms to wipe a portion of said rows to select a row, apparatus for causing an arm to wipe along its row to select a contact, and apparatus for causing said arms to wipe the remainder of said rows to return to normal.

5. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, wipers controlled thereby, one for each' row, means for suitably supporting said wipers whereby they are adapted to successively wipe their rows when the shaft is rotated and apparatus for controlling rotation of said shaft to select a contact..

6. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows. of a rotatable switch shaft, wipers controlled thereby, one for each row, means for suitably supporting said wipers whereby they are adapted to successively wipe their .rows when the shaft is rotated, apparatus for controlling rotation of said shalt to select a contact, and apparatus for controlling rotation of said shaft to return it to normal.

7 In an electrical switching mechanism,

the combination with passive switching contacts arranged radially in rows, of a rotatable switch shaft, movable contact arms spirally fastened to said shaft, one for each row, apparatus for controlling rotation of said sh: ft to bring to a selected row its arm, and apparatus for controlling movement of said arm along the row to select a contact.

' tatable switch shaft, movable contact arms spirally fastened to said shaft, one for each row, apparatus for controlling rotation of said shaft to bring to a selected row its arm,

apparatus for controlling movement of said arm along the row to select a contact, and apparatus for controlling rotation of said shaft to brin said arms to normal.

9. in an e ectrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus adapted to rotate saidv shaft and mechanism adapted to control the rotation of said shaft to cause an arm to select a contact.

10. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus adapted to rotate said shaft, mechanism adapted to control the rotation of said shaft to cause an arm to select a contact, and apparatus for controling rotation of said shaft to normal.

in an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one. for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus adapted to rotate said shaft, mechanism for .ontrolling the rotation of said shaft to select a row and mechanism for controlling the rotation of said shaft to cause anarm to select a contact I of a selected row.

12. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor: apparatus adapted to rotate said shaft, mechanism for controlling the rotation of said shaft to select a row, mechanism forcontrolling the rotation of said shaft to. cause an arm to select a contact of a selected row, and apparatus for controlling rotation of said shaft to normal.-

13. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus for rotating said shaft, means for releasing said shaft to permit operation of said apparatus, and mechanlsm adapted to control and arrest the rotation of said shaft to cause an arm to select a contact.

1%. in an electrical switching mechanism, the combination with passive switching con tacts arranged in rows, of a rotatable switch shaft, active contact arms attachedthcrcto,

one for each row, adapted. to successively wipe their respective rows when the shaft is rotated, motor apparatus for rotating said shaft, means for releasing said shaft to permit operation of said apparatus, mechanism adaptedto control and arrest the rotation of said shaft to cause an arm to select contact and apparatus adapted to release said shaft to allow it to complete a revolution to normal.

15. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, ofa rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus adapted to rotate said shaft, means for releasing said shaft to permit operation of said apparatus, nicchanism for controlling the rotation of said shaft to select a row and mechanism for controlling and arresting the rotation of so id shaft to select a contact of a selected row.

16. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor apparatus adapted to rotate said shaft, means for releasing said shaft to permit operation of said apparatus, mechanism for controlling the rotation of said shaft to select a row, mechanism for controlling and arresting the rotation of said shaft to select a contact of a selected row and apparatus adapted to release said shaft to allow it to complete a revolution normal.

17. In an electrical switching mechanism, the combination with passive switching contacts, of a movable contact arm for making connection with said contacts, a motor spring for moving said arm when the mechanism is operated, electromagnets for controlling the movement of sold arm and apparatus automatically brought into play by the operation of the mechanism to restore said spring,

18. In an electrical switching mechani m, the combination with passive switching tacts, of a movahie contact arm for ma connection with said contacts,.m0tor mecnin nism storing energy for moving said when the switching mechanism is operated, apparatus for controiling movement, of said arm to select a contact, means for effecting the return of said arm to normal and apparatus automatically brought into play upon the return of said arm to normal for restoring energy to said motor mechanism.

19. Inan electrical switching mechanism, the combination with immovable swithing contacts, of a movable contact arm for making connection with. said contacts, motor mechanism storing energy for moving said arm, apparatus for rendering said ener y effective to move said arm when the switc ing mechanism is operated, mechanism for controlling such movement to select a contact, and apparatus actuated by the operation of the switching mechanism to restore said motor mechanism.

20. In an electrical switching mechanism,

the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active cont-act arms attached thereto, one for each row, adapted to successively wipe their respective rows when the shaft is rotated, motor mechanism storlng energy for moving said shaft when the switching mechanism is operated, apparatus adapted to control the rotation of said shaft to cause an arm to select a contact and apparatus adapted to be actuated by the operation of t e switching mechanism to restore energy to said motor mechanism.

21. In an electrical switching mechanism,

the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto,

one for each row, adapted to successively.

Wipe their respective rows when the shaft is rotated, motor mechanism storing energy for rotating said shaft when the switching mechanism is operated, apparatus for controlling the movement of said shaft to select a row, apparatus for controlling the movement of the shaft to cause an arm to select a contact of a selected row, means for effecting rotation ofthe shaft to normal and apparatus actuated upon the return of the shaft to normal for restoring energy to said motor mechanism.

22. In an electrical switching mechanism, the combination with passive switching contacts arranged in rows, of a rotatable switch shaft, active contact arms attached thereto, one for each row, adapted to successively Wipe their respective rows when the shaft is rotated, motor mechanism storin energy for rotating said shaft, means for re easing said shaft to permit operation of said motor mechanism, mechanism adapted to control and arrest rotation of said shaft to cause an arm td 'eelect a contact, apparatus adapted to 23. A selector for automatic exchanges including multiple terminals arranged radially in rows, a series of adjustable terminals corresponding to'said rows, means for ad justing said last-mentioned terminals to bring-a desired one into operativerelation with its row, and a magnet for controlling travel of said desired one along the row.

24. A selector for automatic exchanges comprising a plurality of groups of stationary contacts, a rotatable shaft having a plurality of spirally disposed adjustable contacts, one for each row of stationary con-- tacts, means for rotating said shaft to bring a desired adjustable contact opposite or adjacent to its row, and apparatus for rotating the desired contact step by step along the row.

25. A selector for automatic exchanges comprising multiple terminals arranged in arc-shaped rows, a rotary shaft carrying adjustable contacts, one foreach row, a magnet for causing travel of said shaft to bring a desired contact adjacent to its row, means for causing said desired contact to travel along its row, and a release magnet for re storing the switch to normal.

26. selector for automatic exchanges con1pr1sing a series of groups of stationary contacts, a rotary shaft having a number of adjustable contacts, one for each group of stationary contacts, a magnet for rotating said shaft step by step to select a group, each step bringing a different adjustable contact into operative relation with its group of stationary contacts, and a paratus for thereafter causing an adjustable contact, brought into operative relation with its group, to select a desired stationary contact of said group.

27 An automatic switch for telephone systems comprising bank contacts arranged in groups, cooperating wipers, means for rotating said wipers to select a group and means for thereafter rotating said wipers to select a contact in a group.

28. A selector switch including groups of contacts, cooperating wipers one for each group, means for rotating said wipers to cause one of them to select a group, and means for thereafter rotating said wiper to connect with a contact in a selected group.

29. A selector switch comprising contacts and cooperating contact makers, a rotatable shaft for operating said contact-makers, a pair of toothed wheels su ported upon said shaft adapted for control ing the operation thereof, electromagnetic mechanisms for controlling said wheels, and a motor device also supported upon saidshaft for operating said shaft to move said contact-maker ac cording to the operation of said electromagnet'ic mechanisms.

30. A selector switch comprising a wiper operating shaft, primary and secondary operation of said tooth ed Wheels supported by said shaft and cooperating" mechanisms, and a motor device also supported by said shaft for drivingsaid shaft according to the selecting primary and secondary Wheels and mechanisms.

31. A selector switch comprising contacts adapted to be grouped, movable contactmakers adapted for selecting said contacts,

electromagnetic mechanisms for controlling the selecting of a contact of any of said groups, and a motor device for moving said contact makers according to the operation of said electromagnetic mechanisms.

32. A selector switch comprising passive switching contacts, movable contact makers adapted for selecting said contacts, units and tens toothed Wheels and cooperating the selecting operation of said Contact makers, and a motordevice for moving said contact makers according to the operation of said electromagnetic mechanisms and wheels,

33. in an electrical switching mechanism, the combination With passive switching con:

a pair of toothed Wheels and cooperating electromagnetic mechanisms for controlling l tacts, of a movable contact arm for making connection with said contacts, a motor dcvice for moving said arm when the mocha nism is operated, eleotromag'nets for controlling the movement of said. arm, and apparatus automatically brought into play by the operation of the mechanism to restore said motor device. as

3%. A s "tor switch comprising groups 0*? passive s ching contacts, of a mova contact arm for making connections Witsaid contacts, a motor device for moving said arm when the mechanism is operated to select any group and a contact therein, electromagnetic mechanisms for controlling the movement of said arm to effect such selection, and apparatus automatically brought into play by the operation of the 4,5 mechanism to restore said motor device.

Signed by me at Chicago, county of Cook and State of Illinois, the presence of ilffi') Witnesses.

ALFRED H. DYSON.

lVitnesses GEORGE E. MUELLER, M. lit. Root-mono.

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