US2606260A

US2606260A - Interlocking transfer switch

Info

Publication number: US2606260A
Application number: US617264A
Authority: US
Inventors: Joseph F Frese
Original assignee: MONITOR CONTROLLER CO
Current assignee: MONITOR CONTROLLER Co
Priority date: 1945-09-19
Filing date: 1945-09-19
Publication date: 1952-08-05
Anticipated expiration: 1969-08-05

Description

Aug. 5, 1952 f J. F. FRESE 2,506,260

INTERLOCKING TRANSFER SWITCH Filed Sept. 19, 1.945 6 Sheets-Sheet l Aug. 5, 1952 J. F. PRESE INTERLOCKING TRANSFER SWITCH Filed Sept. 19, 1945 6 Sheets-Shee(I 2 Aug. 5, 1952 J. F. FREsE INTERLOCKING TRANSFER SWITCH Filed sept. 19, 1945 6 ShOBtS-Sheet 3 Aug. 5, 1952 J. F. PRESE INTERLOCKING TRANSFER SWITCH 6 Sheets-Sheet 4 Filed Sept. 19, 1945 Aug. 5, 1952 .1. F. FRESE 2,506,250

INTERLOCKING TRANSFER SWITCH Filed Sept. 19. 1945 6 Sheets-Sheet 5 A50/M32@ i @moa/j TEL-7 I ug. 5, 1952 J. F. FRI-:SE

INTERLOCKING TRANSFER SWITCH 6 Sheetgheet 6 Filed Sept. 19, 1945 Patented Aug. 5, 14952 UNIT ED* STATES PATENT OFFICE INTERLOCKING'. TRANSFER SWITCH.

J osephzF.l Frese, Baltimore, Md.. assigner-to The Monitor Controller Company, Baltrnore.Md.',.

a, corporation of Maryland; Application" September/19, 19.45`,\7Sc171alfNo. 617,264

7 Claims.; (Cl. 20098 My invention relates-broadly to higlfiv frequency electrical switches, and more particularlyf toa high frequency interlocking-:transfer switch.

Oneof the objects` of my invention isto provide a construction of-high frequency-interlocking transfer switch in' Whlchsets of electricalk contactors may be controlled in position where one set of contactorsi--is locked in one positionrepresenting one circuit` condition; while the other set of contactors is-lockedlin an opposite position representing anopposite circuit condition.

Another object of'v myinvention-vi's` to provide a construction of` high: frequencyelectrical switch having a pair-of sections forseparately controlling the position of separatesets,`v of electrical contactors with interlocking` meansv for preventing accidental movement of one set of contactors where another set-offfcontactorsfhas been pre-conditioned.

Still another object of my invention is vto provide a construction ofA high1 frequencyzinterlocking rtransfer switch, including mechanical inter.- locking means associated with a pair of electromagnetic actuators for'insuring the maintenance of one electro-magneticactuator an actuated-1 position, while another electro-magnetic actuator is in an unactuatedposition.

Still another object of my inventionis to provide a novel construction of a mechanical interlock for a pair` of electro-magnetic actuators'for operation ofhigh frequency-contactera set forth Vmore fullyin the; specification hereinafter following by reference to the accompanying drawings in which:

Figure 1 is afrontplanview of the interlocking transfer switch of my invention; Fig.w2 is a. reary plan View of. the interlockingy transfer switch of my invention; Fig. 3 is` a. side View ofY the interlocking transfer switch lookingin the direction of arrow AY of Fig. 1';"figqlvisanV end. View of the interlocking transfer switch looking in the direction of. arrow B ofFig., 1v withcertain of the partsomitted to. avoid confusion; Fig. 5" is an enlarged transverseyertical SGCtional'view taken substantially on liney 5-5 of Fig,3;Fig. 6"y is an enlarged horizontaly section takensubstantially on line 6--6 of "Fig,-` 3 withtheelectro-mag.- netic actuators in the sameposltion asrthlat illustrated in Fig. 1'; Fig. 7 isr avview similar to the view illustrated in Fig. 6." but Showingv the actu-` atorsY in a position opposteto the positionillustrated in Fig. 6; Fig, 8 isa. transverse sectional Viewk takenl substantially online 8--8 of. Figs. 1. and 3; Fig. 9` is a longitudinal sectional View takenfsubstantiallyf'on line 9--9=of"Fig; I; Fig. 10 is avdetail view-illustrating one of the mechanical' stops carried by the reciprocative members which arecontrolled bythe electro-magnetic actuators, the view being taken substantially on line lll-I0 of Fig; 1'; Fig. 1lV is a detail view taken substantially online ll---Hr of Fig. v1 and illustrating one of lthe fixed contacts employed `in the high frequency switch contact-employed in the-switch of my invention; Fig. 12- is a perspective view'ofbne ofthe abutment angles used in association with the stationary-contacts of the switch construction of myinvention; Figf. 13-is any enlarged plan view-illustrating the interlocking: mechanism employed Ain the switch of myl invention with parts illustrated in the same position asset forth in Fig. l; Fig. 14 is a perspective View ofthe left endcontrol link in the interlocking-mechanismof Fig. 13; Fig. 15 isa perspective view of the-right end-link of. the-interlocking mechanism illustratedin Fig. 13; and-Fig. 16is a schematic and' diagrammatic View illustrating the high frequency interlocking, transferswitch of my. invention.

Referring to thedrawings in detail, reference cl'xari-rcter l. represents-ay panel structure of insulation material such asMicalex or Bakelite. which supports thei elements ofi thefinterlocking transferswtch ofmyiinvention. Adjacent one end of thepanelestructure l1 It provide supporting members.; 2 I and 3,; for the movable` contactors ofthe switch ofg'my,y invention.. The supporting members); and 3:.have screw.-threaded'portionsv 2a and 3ay which."projectythrough. the. panel structure l. Intermediategthe screw@threaded end 2a and the opposite projectingv end. off supporting member V2 I provide; cylindrical* portions 2li-.and 2c which serve as bearing supports for. thek tubular cylindrical sleeve-fl k which ispfreefto, rock, abouty the cy.- lind-rical, portions Zhand 2c.. 'T o.f provide for the pivotal mounting; and restricted: movement of sleeve 'I Igformashoulder 2d on. supporting member 2 which serveszao limit; for the movable Sleeve- Tfand coronashieldflikemembers Va' and. sin.

which the corona shield-likememben 4'V serves as.; the opposite limit. for; thel angularly movable tubular sleeve-like member 'l and theA corona shield. 6 serves as.'v ai nut; engaging screw threads 2a on the opposite sidevl of panel l, with` the lockwasher 5 interposed between the.: corona shieldl The sleeyerlike member l;

55 thereto by screws 8a.

A multi-leaved contacter 9 is secured by screws I9 to the opposite side of the block 2c. The multileaved contacter projects on opposite sides of the supporting member 2 in opposite directions and terminates in the movable contactors I4 and I5 which serve to establish alternate electrical connections with the aligned ixed contactors IE and I1 supported bythe panel structure Ij. Ihe multileaved contacter 9sec`ured through screws I0 to block 2e serves as a flexible mechanical supporting means for the multiple phased high frequency contactors I4 and I5. Electrical connection is established with the multi-leaved contactor 9 through the iiexible connector I I secured at the end I2 to the supportingmember 2 and at the opposite end by means of screws I3 to the multi-leaved contacter 9. Thus an electrical connection made at terminal I2 to the'cennector II is a circuit to the angularly rockable multi-leaved contacter 9.

The ixed contactors I Iiandullare arranged for high,` frequency electrical Connection with minimum corona losses by reason of theelectrical shieldswhich are associated with the xed contactors. 4For example., the xed contacter I3 comprises an angle member shown more clearly in F1g. 1 2. having an attachment portion Isa which bears directly against the corona shield ISb securedin position by-screws 16e which pass through the corona shields I Id and ISb and into the angle support-v Ijd of the yi'ixed contacter. A binding post I6@ is attached tothe extension Id of the fixedcontacten .v

. The vfixed contacter AI1 isi s` ilar to the arrangement of thefixed contacter I6, that is, the angle support Ila, attached te the contactl I 1 is secured in .position -by .nieansof s crewsg I 1e which pass through they corona;lshields; -l1d :and 11b.. -The binding post I1c is carried by the Iangle support I 1a.A The shaping of `the xed contacters is such that minimum-corona'discharge cani occur due to theloss ofenergywhich might, ordinarily occur at sharpcorners of the contactors.

In spaced relation to the fixed-contactors I6 and I1, I provide another set of fixed lcointa'ctors I8 and I9whichare located at sucndistances from the multi-leaved contacter 9-and fixed .con.V tactors I6 vand I1 that no discharge can-occur therebetween. IThe nXed-fcontactor IBincludes an angle portion I8a which is supported withrespect to panel I by suitable screws le passing throughV corona shields I8b and Id. vBinding post I8c isY provided forV establishingconnection -to the fixed contacter I8. The corona shields.I8b and I'Sd areeach spaced from the panell by spacer members- Igfand Ih. andsecuredbyscrewsIfy;

Similarly, the high frequencyzxed vcontacterf I9 is formed by. angle member I9a havingfsecuring screws I9e extending :through the corona shields I9d and I Sb and through the vpanel lstructure l for maintainingthe xed contacter inthe path of the co-acting multi-leaved .movable contacten The second movable contacter is like the first angularly rockable contacter heretofore described in that an angularly rockable sleeve 20A is mounted on the supporting .member` 3 which is providedwith annular shoulders 3band v3c over which the sleeve 20 is adapted .to angularly rock'. A block 28ek is secured to .thesleeve A2U' and serves as a support for the arm actuator 2l which projects on opposite sides of block 28e and is secured by" means of screws ZIa-extendinginto block 28e. A multi-leaved contacterl 23 is securedtoljthe opposite side of block 20e`by securingscrewsl 4 for mechanically mounting the angularly rockable multi-leaved contacter 23 in position. A flexible connector 25 is secured by screws 26 to the multi-leaved contacter 23 and extends to the binding post 21 at the opposite end which is secured in the end of supporting member 3. Thus, as the sleeve 2|] angularly rocks about supporting member 3 theyiiexible connector v25 is free to iiexformaintaining electrical connection to the multi-leaved contacter 23 while maintaining the electrical circuit therethrough. 'Ihe multi-leaved contactor23 carries high frequency contactors 28 and'29 on opposite ends thereof aligned with the Xed contactors I8 and I9.

The

multi-leaved contactors

9 and 23 are each rsimultaneously controlled about the centers of supporting members 2 and 3 by an arrangement vof insulated bar members 38 and 3i which are mounted for restricted reciprocative movement. The bar members 30 and`3I may be formed from Micalex, Bakelite orether suitable insulation material forminimum losses at high, frequency operation. The b ar .members 38 and' 3l each cofact with the arniactuators Sand .-2I for effecting longitudinal movement ofthe bar-members under electromagneticoperation. `The paths of movement of insulatedbars 30 and 3| are controlled by atransversely lextending guide bar 132 of insulation material. The guide bar 32 is supported at opposite ends Vupon'therear ofthe fixed contactors I8 and .I9 as illustrated more clearly in Fig. 11. The supporting boltV member 33 extends from the rear of the xed contacter I8 and passes through `the bar 32 and is securedin position by the nut member vin the form of a corona shield 34a. The support for-the opposite end of-the bar 32 is similar to the support already explained in that bolt member34 extendsffrom the rear of contacter ISand passes through bar 32 and is secured by corona shield nut'` member 34a.

In ordertereduce the friction of movement of the-bars 3 8 and 3|-v through insulated bar 32 Iprovide recesses35a and 36a immediately behind the slots 135an d36 :in bar 32 which guide the longitudinally extending bars 38and 3I. These cutouts or recesses 35a and 36a substantially reduce the vsurface contact between bar 32 and the longitudinally extending bars 3 and 3l while providing for the required guiding Aof the bars 30.2Iid3I-.

The bars 3 0V and 3l veach carry transversely extending pins. which I have represented

lat

31 and 39 with respect tobar. 38 and at r38 and 40 with respect te Ybar 3I'.`The`.pins 31'and 39V extending through bar 30 are each secured in posi- -tion byv corona shieldelike members 31a -31b and 39e-43919. The.tfransverse`

pin members

38 and 48 YfeXt'ei'idingthflfOugli bar `3I are each secured in position bylcor'ona shield-like members 38a.- 33b..and 40%4019. f The'pri'lhmbers 31-39 and 38..-4'0 serve asia lost motion vconnecting means forestablishingfop'erating connection with the arm actuators 2Ifand 8. Thus when bar 30 is shifted tothe position illustrated in'lig.v l, the transverse pininembers -31 and 39 engage beneath thejextensionslof arms'y 2I a'nd iinpartingrocking' movement to the block' members 20er and 2e ina ceiniter-clockwisev direction thereby moving h igh frequehcy'contactors 28. andIII into surface Contact and connection withffi'xed contactors I8 f and I6 while 'simultaneously shiftingv contactors 2:9 vand I 5, outof connection with fixed'contactors I9 va'r1cl'I1'. v A Similarly, the transverse pinmembers 3.8 and 40 carried'by longitudinally movable bar3ft .engage beneaiththe .ends'of arm' actuators ascenso :I and swhen par al isssnifp-ted mmedirecuon of arrow 4Il forfclosingfelectrical connection be tween movable contacter'r 29:-andY fixed cont-actor I9 and between movable contactor I5 and fixed contactor I1. The movement of barsv 30- and 3I in opposite directions serves to positively control the rocking movement ofthe multi-leavedv con-` tactors 23 and 9- for alternately est'ablishingand breaking electricall co'rm'ect-ionbetweenthe-sets of movable andfixed` contactors.

The electro-magnetic operating mechanism which controlsv the rocking movement of the'contactors as heretofore ldescribed, comprises a pair of solenoid' devices representedf at 42 and- I3-y '15 able frame members 44 and'45 attachedjto theA mounted on the panel structure I through suitfield magnet structure IIS-and 4.1 'ofthe' solenoid devicesand securedithrough suitable bolts tothe` panel structure I'. Each magnetic actuatorinj-A cludes a terminal board structure 48'and` 49upon; which the several terminals of the'electro-ma'g.

netic windings

42 and 43 Aare mounted asrepreL tening means represented at54a and 55a to the ends of the bars 3%) and 3l respectively. The fastening means centers"

thestrap structure

54 and 55 With respect to the center lines of' the longitudinally extending'bars 30 `and 3| thereby insuring the balanced andr symmetrical operation ofthe switch. The strap members 54' and 55 serve to secure the armature members`52 and 53 in a positionr in whichltheyv are presented directly to the electro-magnetic: core structure of the electro-magnetic operating" mechanism when the associated electro-magnetic winding' is energized.

The armature'

members

52 and 53 e'achcarry panels cf insulation material 5Sv and 5'I'associated therewith for supporting sets of auxiliary contactors. structure 56`as carryingl the

auxiliary contactors

58 and 59 aligned with sets of 'xed contactors 55 and 6I supported byV thefauxiliary panelstructure 62 attached to the main panel' I. It will be observed that the sets of contactors 58, are oppositely arranged with respect to the sets of contactors 59 so that When contactors 58` are electrically connected with contactors 5U, contactors 59 are open with respect to contactors E I'. Similarly, the insulated. panel structure 51 of the opposite electro-magnetic operating mechanism carries sets of contactors 63 and 64 aligned to co-act with sets of iixed contactors65 and 65 in such manner that when` the electrical circuit between contactors 53 and (i5 is closed the electrical circuit between contactors 66 and contactors 64 is open. Other arrangements of auxiliary contacts may be provided for the control or" any required number of electrical circuits such as the power circuits of an electrical system asson ciated withl the high frequency circuits controlled by contactors 253-18; I4-It;` 2li-I9; and I,5II. A

In order to insure against accidental-operation In Figs; 1 and 4 I represented panel" of the -highf frequency-ccntactors-A at' times-when:J such `operation might be y dangerous or'Y injurious A to the associated electrical circuits, I provide-anovel construction of interlockv forcontrollingthe transfer switch. The-interlock isshown more particularly inFig-s. 6, 7, 13; 14; and 15 comprising a multiplicity of symmetrically arrangedpivotally mounted latchesv 61-L168- 69l andA 'I3 journaled with respect-'toth'eepa'nell I- onfcenters representedv at'lI, 12, 13, and'14'. YTheilatches are symmetricallyshapedl and itwill lbe observed thatthe end'latchesAG'I and 1I)k are each-providedv with substantially semi-circularv -recesses t61aand ma therein to serve as'engage'ments and inter locks for roller members-52'aiand' 53a respectively Whereroller members 52aandf 53'asare1carried` by the

armature members

52 and 53 respectively.

The latches 68 and B9 areshaped-toprovidefcamlike faces 68d and 69d thereonea'ch cox-acting With roller members--5'2-liv and 536 carried. bythe Thelatches are pendantly mounted andof limite'dfswinging disarmature members' 52 and? 53.

placement suicient to latch 1 ori unlat'chl the armature members 52fvandi 53 inu either' of' two` ylimiting positions.

This interlocking operation is accomplished by providing anlarrangementof links interconnecting the pendantly mounted latches -as4 represented at 153 and-16 inI Figs. -15- and 14. The links V'I5and 'I5 arelea'ch shaped to provide apair of projecting lugs 15a`f andz'l5b. ex-

tending-'infonedirection-and a-projecting lugi15c extending in the opposite direction and a pair. of projecting lugs `'IIiaand 1Gb extendinginone direction andan intermediate lug 16e-extending in the opposite direction. The 1lugs`-15a rand 15b are pivotally connected Withthe latches'fl andl 69 respectively asrepresented at 61h and-'691).

The lugsV Gla-fandI'Ib'7 are pivotally: connected. with latches 68 andlas representediatb: andv tend parallel facer to: face with respect tofeachi. This co-acting relation -serves to. providek an interlocking arrangementfor-the armature,

other. r

members 52 land-53 so. that thesemembers. are

maintained either in the` position. illustrated: in

Fig. 64 crv the position illustrated? in 7. atuthe opposite limitsof.` displacementl thereof;

The latches BT and. 'I0-.each provide-mountingY means for the platesof insulation material repreE sentediat 'land 19; Platesf'landzg are secured through suitableirivetsa 'I8a.and 'lfawor by. other means to thelatches Bf'IandJO'fa-ndff project angularly with respect theretotoprovidef supportingfmeansfor the` operatingtpinl members and 8l respectively. The; operatingy pin. members, 83 f and 8.1 have alimited-orbitk ofv movement for operating the controll contactors i represented at.

82 `and 83. 'Ihecontrol contactorsZ and 83. are

supported by the terminal kpanels 485 and 49- as.

shown in Fig. 2V in the.positionswhichhave been superimposed for purposesoi` explanation: upon Figs. 6 and 7 The-'control contactorsinclude the: binding posts.50 and 5I'.heretoforedescribedand a resilient leaf springY connection .between con.- trol contactors 82 and 83-throughcoil springs,

82a and 83a to the postspwhich extendromjbind.-

ing posts 4822 and 49h respectively. Each ofzthe.

movable spring-likev contactors 182,. and. 83';v carry.r

contacts'A B2b and 83h onqthel ends; kthereon which,

are` adapted to,L register with andestablish connectionwith Athe posts l5I] and 5I respectively when spaciellvdsplaeed ibx engagement of pins 80 andglftherewithff@hue it will. be seen that when` electro-magnetic vwinding 42` is energized and armature member -52 ,magnetically attracted by core structure 46, the armature member 52 moves to an engaged-positionin which it is maintained between

latches

61, and 68 whereupon pin 80 moves in a path whichengages spring contactor 82. shiftingecontactor B2b out of circuit connection withfbindingpost 5U thus opening the electrical circuit' through the solenoid winding 42. o By this movement, the armature 53 is released in the position illustrated in Fig. 6 and in releasing conditions the ,electrical circuit through the solenoid winding 43 by angularly shifting the contactor83h into electrical connectiorrwith-lbindingpost5I. l Fig. 16 schematically illustrates the'alternate electric vcircuit conditions Vwhich are thus provided. It will be seen that eachsof :the

solenoid windings

42 and 43 have separate control contacts in circuit therewith which are schematically shown at 84 and 85,. By-virtue of the fact that contactor 821: is displaced out of contacting relation with contactor 58 as inthe arrangement illustrated in Fig. 6, the closing of switch 84 will not energize solenoid winding 42 so that it is not possible to accidentally operate the .transfer switch. The transfer switch is locked inthe position in which contactcrs 28 and I8 and contactcrs I4 and IS are maintained in electrical connection until the operator positively desires to release the interlock and close contactsl 2S-I9 annd I5-I'I whereuponthe; Operator closes remote control switch 85.- .By virtue of 1the conditionillustrated more clearly in vl'lig.- 6, an electrical circuit may thus be completed through binding post 49h, contacter 83, contact 8,3b. binding post 5I through the source of potential and through switch 85 to binding post 49a and-through the solenoid winding 43. Upon closing of the lremote control switch 85 armature .53 is drawn upwardly against the magneticgcore structure 41. lBy this movement vroller `member 53b moves against the face of cam-like latch 69 in a clock-Wise direction and shifting link 1,5 tothe leftiand pivoting ,link l1 clockwise.y The -displacement, of link 61 has the effect of releasingarmature `member, 52 which drops byitsmass 'due 'to-.gravity thereby opening contacts 28-'I.3iand.I4-I6 by the drag, of

pin members

31 and 39 .against the multi-leaved contactors 23-9. At the Same time the electrical circuit through solenoid winding `42 is conditioned by theclosing of an electrical circuit through contact 42h and binding post 5I! of the remote control circuit illustrated inEig. 16. Thus switch 84 may thereafterbe closed at any desired time to activate solenoid winding 42 for again closing contacts 28-I8 and I4I6. The relation of the parts of the interlock mechanism in this condition are illustrated in Fig. 7, but it will be observed rollerjmember 53 has been engaged within the-semi-circular recess a of the latch 10 for maintaining the ,armature 53 in the actuated position; in,- which contacts 29-I9 and I5-I1 are. closed. Itpwill alsobe noted that` in this conditionthis power circuit through solenoid winding; has v'been .interrupted as pin 8| has caused `vafdisengageme'nt of .contact V83h from bindingY post 5I.: Thus it will be observed that operation of the -high frequency. switch is ac-v complished by a momentary 'application offpower which; after being applied, is removed from the` 20.1` 1 5 are very simple in construction and may thus .be manufactured on a quantity basis at low cost.

` cation offpowerv to solenoid winding 43 will have no eifect and it is only possible to cause an opening of contacts 29-I9 and I5-I1 by closing remote control switch 84 which circuit has been conditioned as represented in Fig. 7 by the movement of contact 82h into register and connection `with binding post 5B thereby preparing the circuit through solenoid winding 42 for activation from the remote control system. Under these conditions contacts28-I8 and I4-I6 can be closed and contacts 29-19 and I5-I1 can be opened.

The interlock is entirely symmetrical in its construction and has proven very efficient in operation. .The pivotally mounted latches and the interconnectingl links shown in Figs. 13, 14 and The auxiliary contacts have been represented in association with the

insulated panel structures

56 and 51 in certain specific arrangements, but it will be understood that various arrangements of auxiliary contacts may be provided and that the particular arrangements shown are for illustrative purposes only. Moreover, I have illustrated the high frequency contactcrs as limited to a pair of contact systems whereas any multiple number of high frequency contactors may beprovided and operated according to the principles of my invention. The auxiliary contacts may be entirely omitted if desired. Because-of the lexiblecircuit arrangementof the contact systems of my invention it is entirely possible to arrange connections from a load circuit to the terminals 21 and I2 of the standards 3 and 2 Yand arrange connections to power circuits of diifering frequencies to contactcrs I6 and I8 and to contactcrs I1 and I9 respectively. That is, a power circuit of one frequency may terminate at contactcrs I6 and I8 and a power circuit of another frequency may terminate at contactcrs I1 and I9 and either of these high frequency power circuits may be impressed upon a load connected to the terminals I2 and 21. In lieu of the arrangement just described, two separate loads may terminate at the terminals I6`I8 and I1-I9 respectively and a highv frequencyv power system connected to bindingypostsv 21-I2 may be impressed upon either of the loads selectively.

As heretofore observed, care is taken to round all discharge points of the high frequency switch system for minimizing possible losses due to corona discharge at high frequencies for which the transfer switch system of my invention has. been designed. The magnetic actuating func-" tions of the switch are maintained at such a distance from the high frequency contactoriunctions of the switchjthat discharge therebetween or losses due to tendency of such discharge is eliminated.

While I have described my invention incertain of its preferred embodiments, I realize that changes and modifications may be made and I intend no limitations upon my invention otherlimiting positions'a'Teshaped'fterminus on each 4of said control members, anelectromagnetic ac.- tuator for controlling each of saidcontrol members, an electromagnetic Winding for operating each of said electromagnetic actuators, a control switch for each oi said electromagnetic windings.

'means pivotally mountedwith respect to said ysuplvlorting base and coacting separate fswitch operatorsmovable bysaid control members and `ensageable by theaioresaidmeans vfor conditioning-said controlswitchesby movement oi one of said c ontrolswitchesto iopen position vwhen one v-of .said Yelectromagnetic actuators eis ener- 'gized `andby .movement-,of Athe'aotlfier oisaid 'con- `trol-switches,.to ,closed position when the other of said'relectromagnetic `actuators is "energized .and means clisposedlbetwe'enfthe adjacentends of the T-shapedterminuson-each of said reciprocative control members for alternately latching and Aunlatching said controlmembers injposition 'for :maintaining `said `controly switches open or closed.

2. An interlocking transfer switch comprising a supporting base of insulating material, a pair of reciprocative control members having downwardly depending T-shaped termini thereon, movable in substantially spaced linear paths to either of two limiting positions, an electromagnetic actuator for controlling each of said control members, pairs of angularly movable members, each pivotally mounted with respect to said base and symmetrically arranged on opposite sides of said control members, said angularly movable members each having cam shaped faces thereon, one angularly movable member of each of said pairs of angularly movable members being located in positions between said reciprocative control members in alignment with the adjacent ends of the T-shaped termini thereon and one angularly movable member of each of said pairs of angularly movable members being located in alignment with the outside ends of the T-shaped termini said reciprocative control members each carrying cam engaging members on the T-shaped termini thereof operative to establish interlocking relation with the cam shaped faces of said pairs of angularly movable members for retaining one of said reciprocative control members in one limiting position while the other of said reciprocatve control members is retained in an opposite limiting position.

3. An interlocking transfer switch comprising a supporting base of insulating material, a pair of reciprocative control members, movable in substantially spaced linear paths to either of two limiting positions, an electromagnetic actuator for controlling each of said control members, pairs of pendently mounted angularly movable members, each pivotally arranged on opposite sides of said control members, said pendently mounted angularly movable members each having cam shaped faces thereon, said reciprocative control members each carrying cam engaging members on the T-shaped termini thereof, establishing interlocking relation with the cam shaped faces of said pairs of angularly movable members for retaining one of said reciprocative control members in one limiting position while the other of said reciprocative control members is retained in an opposite limiting position, and a control switch individual to one of each of said pairs of said angularly movable members for controlling the circuits through said electromagnetic actuators.

4. An interlocking transfer switch comprising a supporting base fof insulating material, a pair vof reciprocativecontrolmembers .having downwardly depending. T-shaped termini, movable in substantially.. spaced lineair ,paths to either of two limiting positions, an electromagnetic actuator for ,controllingeach.ofI said control members,a ypairof roller 'members carriedby each of said reciprocative-,control members 4on the T-shaped ,termini thereof, sets of angularly movable lmemable. members for eflectinglalterna-te engagement and disengagement ofcsaid jangularly movable fnrembers=withthe roller members carried by said reciprocative control-members ein. alternately `opposite limiting positions." f

5. Aninterlocking transfer switch comprising a supporting base of insulating material, a pair of reciprocative control members, movable in substantially spaced linear paths to either of two limiting positions, an electromagnetic actuator for controlling each of said control members, a pair of roller members carried by the T-shaped termini of each of said reciprocative control members, sets of angularly movable members pivoted on said base in coacting relation to the roller members carried by said reciprocative control members, one angularly movable member of each of said sets constituting a roller engaging and holding means and another angularly movable member of each set constituting a release means for said roller engaging and holding means, and links interconnecting the roller engaging and holding means of one set of angularly movable members with the roller engaging and release means of another set of said angularly movable members for effecting alternate engagement and disengagement of said reciprocative control members in alternately opposite limiting positions.

6. An interlocking transfer switch comprising a supporting base of insulating material, a pair of reciprocative control members, movable in substantially spaced linear paths to either of two limiting positions, an electromagnetic actuator for controlling each of said control members, a pair of roller members carried by each of the T-shaped termini of said reciprocative control members, sets of angularly movable members pivoted on said base in coacting relation to the roller members carried by said reciprocative control members, one angularly movable member of each of said sets constituting a roller engaging and holding means and another angularly movable member of each set constituting a release means for said roller engaging and holding means, links pivotally connected between one of said roller engaging and holding means and one of said roller release means for said roller engaging and holding means of each of said sets of angularly movable members, and spring means interconnecting each of said links for effecting alternate engagement and disengagement of said reciprocative control members in alternately opposite limiting positions.

7. An interlocking transfer switch comprising a supporting base of insulating material, a pair of reciprocative control members, movable in substantially spaced linear paths to either of two limiting positions, an electromagnetic actuator for controlling each of said control members, a pair or" roller members carried by the T-shaped termini of each of said reciprocative control members, sets of angularly movable members pivoted on said base in coacting relation to the roller members carried by said reciprocative control members, one angularly movable member of each of said sets constituting a roller engaging and holding means and another angularly movable member of each set constituting a release means for said roller engaging and holding means, links pivotally connected between one of said roller engaging and holding means and one of said roller release means for said roller engaging and holding means of each of said sets of angularly movable members, and spring means interconnecting each of said links for effecting alternate engagement and disengagement of said reciprocative control members 'in alternately opposite limiting positions said links extending substantially parallel to each other intermediate said angularly movable members andl said base.

JOSEPH F. FRESE.

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