US1287715A - Automatic selecting-switch. - Google Patents

Description

F. A. LUNDQUHST. AUTOMATIC SELECTING SWITCH.

' APPLICATION FILED NOV. 27. I916. 1,27,715. Patented Dec-. 1T,1918.

58 r 2SHEETSSHEET I.

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//7 Men far Fran/r. A. Luna/4M5]? L MTM F. A. LUNDQUIST. AUTOMATIC SELECTING SWITCH.

APPLlCATlON FILED NOV. 27. 1916.

' Patented Dec. 17, 1918.

2 SHEETS SHEET 2.

. //7 van for:

Frank Luna/7M5)? by I, 1

FRANK A. LUINDQUIST, 0F YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

-A'O'TOMATIC SELECTING-SWITCH.

Specification of Letters Patent.

Patented Dec. 17, 1918.

Application filed November 27, 1916. Serial No. 133,611. 1

To all whom it may concern:

a citizen of the United. States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Automaticv Selecting-Switches, of which the following is a full, clear, concise, and exact description.

This invention relates to switching apparatus for use in telephone exchange, systems, and more-particularly to power driven panel switches of the multi-brush type, that is, switches of the type provided with a plurality of brush sets, anyone of which may be ,rendered operative in extending a call.

the provision of means for causing a power driven switch to be responsive to impulses transmitted directly from an impulser rather than to impulses, transmitted from the switch itself, and controlled by a sender of any well-known type.

According to this feature, the selection of the stationary terminals of the desired line is effected by the sending of a train of impulses to actuate one of a plurality of sets of brushes having access to a corresponding plurality ofmajor groups of terminals, the sending of ,a second train of impulses to direct the selection of a plurality of like levelsin a'corresponding plurality of minor groups, and the sendingof a third train of impulses to direct the selection of a particular set of terminals within a minor group of said terminals and located at the preselected livel. j

The selection of the particular set of v rushes is accomplished in response to a first 2:81? of impulses through a trip rod of wellknown type, and theactuation of the switch in response to the second and third sets of impulses is accomplished through a stepby-step vertical, and a step-by-step rotary i movement of an auxiliary shaft or trip rod whereby a particular finger at a particular level ispositioned before a stop on the brush rod of'such-a switch. The; first'set Be it known that I, FRANK A. LUND UIs'r,

of impulses having been received and the brush-tripping rod having been properly positioned, a secondset of impulses is trans- -m1tted, and results, first, in the tripping of the selected set of brushes, and, second, in the movement of the auxiliary shaft down ward to select a plurality of levels each of which corresponds to the second set of impulses. Upon the transmission of a third set of impulses the auxiliary Sl'llft'lS rotated to select one of the previously selected plurality of levels by positioning a particular finger thereon in correct relation to the. brush carriage to stop the brush before the desired set of terminals at the selected level. At the same time means are actuated for driving the brush carriage downward under a source of mechanical power. WVhen the brush carriage reaches the position limited by the selected finger of the auxiliary trip rod, the source of mechanical power for driving the brush carriage downward is disengaged, and the selected brushes come to rest upon the selected set of terminals.

An added feature of this invention lies in the arrangement of the terminals in the contact banks. The contact bank, as a whole, is divided into a plurality of major groups of one hundred sets of terminals each. Each major group 'is further subdivided into ten minor groups whose-terminals are designated by two digits, a tens digit and aunits digit. All terminal sets in' a minor group are designated by the same units digit and by the ten different tens digits in proper order. within the major, group then is such that corresponding terminal sets in the ten minor groups are designated by the same tens digits and a different one of the ten units digits in the-proper order. of a particular set of terminals then is accomplished, as before stated, through a stepby-step vertical. movement of the auxiliary shaft 61' trip rod whereby a particular tens The selection,

The arrangement Another feature resides in the provision of means whereby the movement of the selectedbrush into its operative position, a nd.

its return to normal, are both. controlled by one magnet.

In the drawings, Figure 1 with Fig. 2 at the top, is a diagrammatic view of the mechanism and circuits of a switch embodying the features of this invention. More specifically, F ig. 1 shows in detail. the operating mechanism, and Fig. 2 represents, with parts broken away, the sections of the contact banks with their individual brush sets, the brirzh selecting device and the auxiliary shaft cooperating with the brush shaft Fig. 3 represents a portion of the driving rod showing the slots therein to cooperate with members of the mechanism proper. Fig. 4 is a partial sectional view on the line 4-4 in Fig. 1.

The switch herein disclosed is designed to serve five hundred lines, the terminals of which are arranged in sections of one hundred each, With a set of brushes cooperating with each section. It will be obvious, however, that the capacity of this switch may be increased by making corresponding changes in the number of terminals served. in the number of brush sets, and in the mechanisms auxiliary thereto.

Each individual switching apparatus comprises a brush shaft 1 slidably mounted in guide members upon a suitable frame (not shown). Upon this brush shaft is mounted a plurality of brush carriers :2, each brush carrier ha ing rigidly but insulatively secured thereto, a set of brushes 3, each set individual to a section l of the terminal bank, and normally maintained in an inoperative position at the top of the corresponding section. The brush sets are adapted to be placed in operative relation therewith upon the actuation of a vertically and rotatably movable trip shaft 5, mounted parallel to the brush shaft 1. The trip shaft 5 is provided with trip fingers 13 arranged at progressively increasing distances above the normal positions of their respective trip lugs 1+ on the brush sets, and is normally held in an inoperative position, as shown.

The brush sets and the tripping devices associated therewith may be of substantially the same character as disclosed in United States patent to Craft and Reynolds, No. 1,123,696. ranged to be operated to select a certain brush set upon its step-by-step downward movement in response to the first set of impulses representii'ig the hundreds digit. For this purpose, trip shaft 5 is rotatably mounted at the outer extremity of arm 17 integral with the-ratchet rack 15, which is slidably and rotatably mounted on an auxiliary shaft 6 and is adapted to be operated by escapement member 16 in response to the first series of impulses. I

To further facilitate the selection of the desired line terminals, an auxiliary shaft 6 is provided, upon which is mounted a plurality of radially-extending arms 7, ar-

Trip shaft 5, however, is arranged spirally about the shaft at uniform distances equivalent each to the space of ten contacts in the terminal bank. Shaft 6 is rotatably and shdab-ly mounted parallel to the brush shaft 1, and 1s arranged by means of the ratchet rack 12, integral therewith,

sired tens digit.

The arms 7, when positioned through the agency of ratchet rack 12, as described, represent levels corresponding to the same tens digit, each arm and level represented thereby corresponding to a diiferent units digit. Integral with the shaft 6 is the rotary ratchet 9, which, operated by the pawl in response to the units impulses, rotates shaft 6 step-by-step to position an arm7 in operative relation to stop 8 on the brush shaft, thereby selecting a level to correspond with the units digit.

Brush shaft. 1, upon the engagement of stop 8 with the selected arm 7, is thereby halted at a tens digit level correspondii'ig' with the units digit. 7

Means are provided for causing the clownward movement of the brush shaft, consisting of a pulley 18 mounted upon the constantly rotating shaft 19, and an electromagnetically operated idler pulley 20 positioned on the opposite side of the rod 21, which is attached to the brush shaft 1 by means to be hereinafter described. Similar means, comprising a pulley 22 mounted upon a shaft 23, constantly rotating but in an opposite direction with respect to that of shaft 19, and an idler operated by the same electromagnet, are provided to facilitate the upward movement or return to normal of the brush shaft 1 and its cooperating members. Brush shaft 1 is given either a downward or upward movement, according as the idler pulley 20 or the idler 24 is actuated, whereby rodQl is forced into and held in frictional contact with the respective constantly rotating pulley.

Means are provided whereby only one stepping magnet causes the successive stepby step movements of the auxiliary selecting mechanism, the proper sequence of the execution thereof being determined by a bar ll. having cam surfaces thereon, and

controlled by a slow magnet 49.

The armature 31 of the stepping magnet 28 is of the form of a bell-crank lever pivotally mounted on the pin 32 secured in the frame (not shown), and is held normally against pin 33 by the coiled spring 34. At the lower extremity of bell-crank lever 31 are mounted pivotally the hook levers 35 and 36 adapted to coiiperate respectively with Y the escapementmembers 16 and 11, and the pawl 10 adapted to engage with the rotary ratchet 9. Magnet 49 controls the bar 41 35, 36 and 43 and the pawl 10 co'ciperate, and on its. opposite face is provided with two sets of ratchet teeth 44 and 45 arranged to engage respectively with the operating pawl 46 of the armature of magnet 49, and with the retaining pawl 47 pivotally mounted on the pin 51 in the frame (not shown).

By means of slidable bar'41 and the cam. surface thereon, magnet 49 determines the proper sequence of the operation. of the escapement members 16'and l1 and the pawl 10, thereby controlling in corresponding or-- der the stepping downward of the trip shaft 5, the'downward movement of the auxiliary shaft 6, and the final rotative movement of the latter in response to the three sets of selective impulses respectively.

The further details of the controlling mechanism will be best understood, and the features of the invention best appear, from the description of the operation of such a switchingdevice in selecting a desired set of line terminals.

Let it be assumed that it is desired to make connection with line No. 432. The controlling impulses from the substation sender will be transmitted over the conductor 25 to the stepping relay 26. It should be noted at this point that the standard substation impulser is arranged in series with the transmitter circuit and that it normally maintains a closed circuit through which talking current may flow. lVhen, however, the impulser is manipulated, impulses are produced by the quick opening and closing of the pair of contacts of this device. In the well-known manner then a circuit is established when the. substation receiver is removed from its hook, which circuit may be traced in this case from ground, battery, the winding of relay 26, the conductor 25 and thence through the circuit (not shown) wh'ichincludes one side of the subscribers line, the substation apparatus, back through the other side of the. line to ground. Upon the consequent energizationof relay 26, a

circuit is closed for slow relay 27 which thereupon attracts its armature. now, that the substation i'mpulser is man1pulated to transmit a series of four impulses.

The bar 41 is directed in its Suppose,

Relay 26 will respond to each impulse, but relay 27 being slow to release, will hold up. its armature. At its armature and back contact, relay 26 at each retraction closes a circuit for stepping magnet 28 extending from ground, battery, armature and back contact of relay 26, conductor 29, magnet 28, conductor 30, front contact and armature .of slow relay 27, to ground. Magnet 28,

responding to the impulses, intermittently closes at contacts 52 the circuit for slow magnet 49, which attracts and holds its armature. 48 to position pawl 46 in engagement with the first tooth of rack 44.

- In the normal position of bar .41 book lever 35 engages in its cup-shaped extremity the escapement member 16, and armature 31, in response tothe first set of impulses, operates through the medium of hook lever 35' the escapement member 16 four times, al-

lowing thereby the ratchet hub 15 and the arm 17 integral therewith to 'belowered four steps. Trip rod 5,being mounted on arm 17, is accordingly given a downward movement of four steps to position a tripfinger 13'611 operative relation with the trip lug 14' of the brush set serving the section of the terminal bank containing; the desired set of termmals.

At the end of the first seriesof impulses,

"armature 31 of the. stepping magnet returns to normal under action of spring 34, and

permanently breaks the circuit for magnet 49. Magnet 49 thereupon deenergizes, al-

lowing its armature 48 to be retracted by" spring 50. Armature 48 in retracting carries the bar 41 down one step by virtue of the engagement of vpawl'46 with the lowermost tooth of the rack 44.

Upon the first downward step of bar 41, retaining pawl 47 enters into engagement with the lowermost tooth of rack 45, and holds bar 41 in that position. Simultaneously, the one arm of hook lever 35 rides up on the elevated portion 54 of the cam surface of bar 41, and is thereby disengaged from escapement 16. Atthe same time hook lever 36 rides into therecess 55, thereby engaging at its cup-shaped extremity the escapement member'll.

The second series of impulses operates the stepping magnet 28, its armature again intermittently closing the circuit for slow magnet 49. Slow magnet 49 again pulls up its iliary shaft 6, the collar 58, which is rigidly secured to shaft 6 and normally prevents the movement of lever 56 suitably pivoted on pin 57 comes out of engagement with the extremity of lever 56. Lever :16 thereupon, under the action of spring 59, is momentarily rotated in a clockwise direction, and by means of the connecting link 60, in slid-able and rotative engagement with the crankshaped portion 61 of trip shaft 5, rotates trip shaft 5, causing the operative engage, ment of trip finger 13 of the shaft 5' with the controlling trip lug 14 of the previously selected brush set. The brushes are thereupon released in a manner, as described in the aforementioned patent, to assume an operative position with respect to theline terminals in the row served by the switching device.

At the termination of the second set of impulses, the circuit for slow magnet 49 is again interruptedat contacts 58, and magnet t9 retracts its armature which, under the action of spring 50, causes the second step downward of bar 41. Pawl 4:7 thereupon engages the second tooth of the rack and retains bar 41 in its second position. Upon this second downward movement of bar 41, hook lever 36 rides up on the raised portion 62 of the cam surface of bar 41, thereby disengaging from the escapement member 11.

Pawl 10, pivotally mounted on the armature,

31, as shown in Fig. 4;, is normally withheld out" of operative relation with the rotary ratchet 9 by the engagement of t e stud 85 with the cam surface 62 of bar ll, ut upon the second downward step of bar 41, stud 5, under the action of spring 87, rides into the recessed section 86 and allows the engagement of pawl 10 with the rotary ratchet 9.

Simultaneously, the one extremity of bell crank lever 43, pivotally mounted at 63, rides up on the raised portion 64 of the surface of bar 41, and thereby causes at its other extremity the partial clockwise rotation of lever 66 pivotally mounted on the pin 67 in the extended portion of lever 68. At its outer extremity, lever 66 in its rotative move ment about the pin 67 causes the engagement of catch 75 with the pin 74.- on the link 70, and at the same time through the medium of the collar 77 on link 76, slidably arranged in engagement with bar '78 and connected therewith by spring 114, causes the downward movement of bar 78 pivotally mounted at 79 in the upper end oflever 7 2, to cause thereby the disengagement-of bar 78 from the lower extremity of lever 68. Lever 68, whichconstitutes the armature of the magnet 80, is thereby freed to allow its free movement about pin 69. Bell-crank lever 43 upon its actuation closes the contacts 8'2, and link rod 7 6 at its lower extremity, closes the contacts 83, both sets of contacts being in the circuit of magnet 80. g

.-The third set of impulses representing the digit 2 will now cause the operation of the tioning an arm 88 in operative position with respect to stop 8 on the brush shaft. 1.

: Slow magnet 49 pulls. up and holds its armature du ring this set of impulses, its armature 48 positioning pawl .46 in operative relation with the uppermost tooth of the rack 44:. Simultaneously, armature 4-8 closes at the contacts 89 the following. circuit for power magnet 80: ground, battery, magnet 80, conductor 90, contacts 83 previously closed by rod 7 6, conductor 91, contacts 82 'previously closed by bell-crank lever-e3, con

duct-or 92, through ,contacts 89. to ground. Magnet 80 is thereupon energized and attracts its armature 68, which, being pivoted at 69, and held in'rigid relationwith the arm 70 throughthe lever 66, its projection and the pin 7 4', brings rod 21in operative engage: ment with the rotating pulley 19,-clamping the rOd betweenthe idler pulleyj2O and the of the brush shaft 1. Rod 21.is held in its normal position by the engagement of pawl 93 pivotally mounted at 81 with the slot 9% in the rod 21. Upon energization of magnet 80, however,- pawl 93 is forced out of engagement with rod 21'by the movement of lever 7 0 toward the'rod 21.

Brush shaft 1 is held in its normal position by disengagement of hook lever 95,

pulley 19'to cause the-downward movement whiclris pivotally mountedon the block 97 with thecatch 98 rigidly-secured to the frame (not shown). Rod'21 has at'its upper eX- tremity and rigidly secured thereto a block '99, which slidably engages brush shaft 1, its movement being limited by'the block '97 and collar on shaft 1. Block 99 upon the downward movement of rodQl engages at its horizontal projection the lower extremity of, lever 95, causing thereby the disengagement thereof from the catch 98 and freeing shaft 1 from the supporting catch 98. Upon further downward movement of rod 21, block 99 engages collar 100 and causes the downward movement'of shaft 1 'witli'the rod 21. The lowerinwardly bentportion of lever 1 15, upon its movement toward the brush shaft 1 under action of spring 117', prevents the the actuation of the armature 68 of magnet 80. The downward driving of shaft 1 is therefore continued until the projection 8 on the brush shaft 1 comes in contact with the stop 88 on the auxiliary shaft 6. Shaft momentary rotation about pin 106, whereby the rod 107 connected to the lever 102 at its farther extremity by pin 108 is likewise given a' downward movement. The downward movement of rod 107 causes the engagement of the collar 109, which is fixed on the rod 107, with the lever 66 with which rod 109 'is'in slidable engagement. Lever 66 is thereupon given a momentary counterclockwise rotation about pin 67, causing the disengagement of catch 75 from pin 74.. The rigidity of the three-bar linkage composed of levers 68, 66 and is thereby destroyed and link 70 with the idler pulley 20 mounted at its extremity is allowed to retract, and the disengagement of the rod 21 from the driving pulley 18 is thereby accomplished. The actuation of lever 66 simultaneously causes the upward movement of the rod 76, whereby the circuit for magnet 80 is interrupted at the contacts 88, the armature68 upon retraction again engaging the bar 78. Brush shaft 1 thereupon comes to a stop, the tripped brush set being positioned in operative engagement with the terminals of the desired line 432.

The selection of the desired line in the above manner is made feasible by the arrangement of the terminals in the row served by the switch. The terminals are arranged in sections of .one hundred each, the first one hundred being in the uppermost section. The selection of the fourth brush setfroin the top thereby selcctsthe corresponding hundred. Each section of one hundred terminals is furthermore divided into ten groups of ten each, each group containing terminals of the same units digit, theuppermost group contalning the terminals of the lines of the units digit 1.

" Like levels in these groups of ten contain terminals of the same tens digit, the uppermost terminal in each group of ten being of the tens digit 1, the next terminal down in each group being of thetens digit 2, etc. Accordingly, the step-by-step downward movement of auxiliary shaft 6 in response to the digit 3 determines the level of the arms 7 to correspond to the digit 3, thereby selecting simultaneously all the-levels in the section of the fourth one hundred corresponding with digit 3. The following to. tative movement of shaft 6 two steps, in response to the impulses representing the j units digit 2, causes the selection of an arm 88 corresponding to the units digit 2, which arm has been previously positioned at the level of the tens digit 3.

As long as the calling line is in use, relay 26 will be energized, and will hold the circuit for slow relav 27 closed at its front contact. As soon, however, as the line circuit is interrupted upon the termination of thecall, relay 26 deenergizes and causes, in turn,

the deenergization of relay 27. Relay 27 thereupon closes at its back contact a circuit for magnet as follows: ground, battery, magnet 80, conductor 90, contacts 110, conductor 111, contacts 112 closed upon the first downward step of trip rod 5,'conductor 113, back contact and armature ofrelay 27,

to ground. Magnet 80 upon attracting its.

armature 68, now in engagement with the bar 78, causes the application of the rod 21 to the updrive pulley 22 through the medium of idler 24, mounted upon the extremity of lever72, which is swungabout its pivot 73 in a counter-clockwise, direction. Rod 21 immediately begins its upward movement, the block 99 at its upper end moving upwardly therewith until it engages the lower and inwardly bent portion of lever 115 held adjacent to the shaft 1 by spring 117, thereby carrying shaft 1 with it. The upward movement of the brush shaft 1 ceases upon the engagement of the horizontal arm of lever 115 with the stop 118 rigid with the frame, whereby the lower end of lever 115 is thrown outwardly, disengaging from block 99. Simultaneously the hooked extremity of lever engagesthe catch 98,

also rigid with the frame, whereby brush shaft 1 is held in its normal position with the brush setsin inoperative position immediately above their respective sections of contacts.

At this point in the movement of ,rod 21, pawl 119 pivotally mounted on the arm 121, rotatably but not slidably secured by the collar 71 to the auxiliary shaft 6, engages slot 120, and pawl 122 pivotally mounted on movement being allowed by the distance from the inwardly bent portion of lever 115-- to bl0cky97 on shaft 1, equivalent to the space of ten contacts and suificient to restore gagement therewith. Upon shaft 6 having reached its uppermost position,'collar 58 on shaft 6 engages with the tail piece of 56 to return trip shaft 5 with its associated trip fingers 13 to. the normal position thereof. Ratchet hub 15 upon reaching its normal position opens at the erztremity ofarm 17, at the contacts 112, the circuit previously traced for magnet 80, whereby, upon the retraction of armature 68, the disengagement of rod 21 from the driving pulley 22 takes place. P.0d 21 drops back toallow the catch at the extremity or" lever 93 to enter slot 94, the pawl 93 maintaining rod 521 in its elevated position. Simultaneously with the actuation of the lever 72 to cause the disengagement of the rod 21 from the driving pulley 22, the bar 78 engages the extremity of the bell-crank lever 124: pivoted to the frame at 125, and causes the actuation of lever l2 ito give rod 126 pivotally connected thereto at pin 127 an upward movement. Rod 126 has integral therewith the twoprojections 128, 129, arranged to engage upon the upward movement of rod 126' with the arms 130, 131 ofthe pawls i6, 47, respectively, whereby awls 4:6, 47 are forced out of association Wit the racks a4.- and respectively, allowing spring 42 to return bar 42-1 to its normal position, as shown.

Provision is further made to cause the return to normal of the switch should the call- .ing subscriber abandon the call at any stage during the setting up of the connection. This is accomplished by efiecting the closure of the circuit for the magnet 80 to apply rodfil to the updrive pulley 22, the circuit being closed at the back contact and armaturefof slowrelay 27, which de'c'nergizes upon the deenergization of stepping relay 26.

Should the calling subscriber hang up his receiver during or after the sending of the first setv of impulses, stepping-relay 26 will deenergize, breaking the circuit of slowrelay 27. Relay 27 then closes the following circuit for magnet 80: ground, battery, magnet: 80, conductor 90, contacts 110 closed, conductor 111, contacts 112 closed by the downward stepping of the ratchet hub 15 and its associated trip rod 5, conductor 113, back contact and armature of relay'27, to ground. Magnet 80 is. energized andapplies rod 21- to drive pulley 22, the linkages still being in the normal position; as shown. The upward movement of rod 21 carries ratchet hub 15 and thetrip shaft 5 Lasagna back to normal through the engagement. of pawl 122 with slot 12 Should the abandonment of the call take place duringthe sending of the second set of impulses, that is, before bar i1 has made its seconddownward step, leaving the bars 66 and 78 in their normal position, as shown, magnet 27 similarly closes the previously traced circuit for magnet 80. The bar 21 in its upward movement returns the hub ratchet 15 with the trip bar 5 and the auxiliary shaft 6 by means of the pawls 122 and 119 respectively.

Should the subscriber abandon the call during the sending of the last set of impulses, during which the down-drive of the brush shaft will already have begun, the stop 8 on brush shaft 1 will come in contact with one of the arms 7 on the auxiliary shaft 6, depending upon the point in the series of impulses-at which the abandonment takes place. The brush shaft will come to a stop, as previously described, the circuit for magnet 80 being broken at contacts 83 and armature 68 again engaging bar 78'. The following circuit is then closed for magnet 80 at the armature and back con.- tact of relay 27: ground, battery, magnet 80, conductor 90, contacts 110 now closed, conductor 112, contacts .112 closed, conductor 113, armature and back contact of relay 27, to ground; magnet 80 causing the restoration to normal to take place as already described.

- What is claimed is:

1. In an automatic selective switch adapted tbiosporid directly to"substation shaft, a plurality of brush sets secured to said 'sheft'each individual to one of said contact banks,m0tive means for said shaft),

' a trip rod parallel to said shaft having trip third train of impulses ,for rotating saidsecond shaft to position said selected brush set in engagement with the selected ter-- minals, and means for disengaging said motive means when said first shaft engages said stop mechanism.

2. In an automatic selective switch adapted to respond directly to substation impulses, a plurality of contact banks; a shaft, a plurality of brush sets secured to said shaft each individual to one ofsaid contact banks, motive means for said shaft,

a trip rod parallel to said shaft having trip fingers thereon,-means operative in response impulses, plurality of contact banks, a

to a first train of impulses to position said trip rod to selectively trip a brush set, a

said second shaft, means responsive to a' third train of impulses for rotating said second shaft to position said selected brush set in engagement with the selected terminals, means for disengaging said motive means when said first shaft engages said stop mechanism and means operated upon the release of the switch to cause said motive means to restore said brush sets to normal position.

3. In an automatic selecting switch adapted to respond directly to substation impulses, comprising a plurality of contact banks, a shaft, a plurality of brush sets secured to said shaft each individual to one of said contact banks, a trip shaft operative in response to the first train of impulses to select a brush set, an auxiliary shaft having a plurality of radially extending arms, escapement means actuated by the first train of impulses for operating the trip shaft, escapement means actuated by the second train of impulses for axially moving said auxiliary shaft, escapement means actuated by the third train of impulses for rotating said auxiliary shaft, power driven means for moving the brush sets to the position predetermined by said auxiliary shaft, power driven means for returning said brush sets to normal position after release, and a common magnet for controlling the application of the power driven means.

l. In an automatic selecting switch adapted to respond directly to substation. impulses, a plurality of contact banks, a shaft, a plurality of brush sets secured to said shaft each individual to one of said contact banks, motive means for said shaft, a trip rod parallel to said shaft, means re sponsive to impulses for operating said trip rod to select a brush set, a stop mechanism for said snaft, means responsive to impulses for operating said stop mechanism lo predetermine the advance of said shaft to cause the said selected brush to engage the selected terminals, and means for disengaging said motive means when said shaft completes said predetermined advance.

5. In an automatic selecting switch adapted to respond directly to substation impulses, a plurality of contact banks, a shaft, a plurality of brush sets secured to said shaft each individual to one of said contact banks, motive means for said shaft, means Gopies of this patent may be obtained for operative in response as ii pulses for selecting a brush slop mech anism for said sha oomph a nd shaft, means responsive to a second train of impulses for axially i'noving said second shaft, .eans responsive to a third train of impulses for rotating said second shaft to determine the advance said second shaft to position said selected brush in engagement 'with thr lected terminals, and means for disengag said motive means when said first shaft said stop mechanism.

6. In an automatic line selecting switch responsiv directly to substation impulses, a plurality contact banks of one hundred terminals each, each bank containing groups of ten terminals each, terminals of like levels in said. groups having the same. designation for the next to the last digit and all terminals in each of said groups having the same designation forthc last digit, a shaft, a pin-- rality of brush sets secured to said shaft each individual to one of said contact banks, mofive means for said shaft, means operative in response to a first train of impulses for selooting a brush set, means responsive to a second train of impulses for determining the movement of the selected brush with respect to the level whose terminals have the same designation for the next to the last digit to correspond with the second train of impulses, and-means responsive to a third train of impulses for determining the advance of said selected brush to the group containing the terminals having the same designation for the la st digit to correspond to the tnird t ain of impulses.

7. In a panel type switch, a plurality of movable brushes, motive means for moving said brushes, means for determining the advance of said brushes, a single means operated to cause said motive means to move said brushes said predetermined advance, and upon the release of the SWl'LCll to cause said motive means to return said brush to normal. position.

8. In apanel type switch, movable brushes, means responsive to impulses for determining the movement of said brushes, motive means for moving said brushes, means operated to cause said motive means to move said brushesto the selected position, and upon the release of the switch to cause said motive means to return said brushes to normal position.

In Witness whereof, I hereunto subscribe my name this i Ath day of November, A. D. 1916.

FRANK A. LUNDQUIST.

five cents; each, by addressing the transmissions? of Patents, Washington, D. G.

all

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