US1793402A - Electrical switching device - Google Patents

Description

G. N. HUGHES ELECTRIQAL SWITCHIG DEVICE Feb. 17, 1931.

Filed May 18, 1928 2 Sheets-Sheet l Dwa Y M ATTORNEY Feb. 17, 1931.

G N. HUGHES 1,793,402 ELECTRICAL SWITCHING DEVICE Filed May la. 1928 2 sheets-sneer 2 ZM @in JJ J6 ATTORNEY key with 'winch Patented Feb. 17, 1931 V GY iv. Beginns, 'or .rLTL incitera ricominciajswncmae twice urpmi-cation inea 'may is,

This invention app ertains'to improvements inl electrical switchingdevices-generally, and more particularly to a multipole block type of such devices for use intesting eflectrical l measuring instruments, and otherjelectrical apparatus ofvariosclas'ses and descriptions.

An object of the invention :is to provide a Y switching device of the kclass set ort h,`-L which Y is o'fan extremely sim-pli-ed lont-durable and Y efficient construction and arrangement of expensive to manufacture.

Another object of thejinvention is -to vpro- -vid'e an electrical test bloc-k, as hereinloefore parts, and Which will bei comparatively yin- Y 16. characterized, which will require only-a minimum amount of. space"k on a switch looardl or panel, and which will Vbemore `easily and Vquicklyy installed in position and wiredfin a 'desired circuit'tvith less dangerof open or 2 0' short circuit than has heretofer e been the c ase in the installation of` known types of such devices. y y A A further objeotgofthe invention is to `provide a test switch block `of the nature hereinbefore mentioned, wherein the Amovable switch-members thereof will be key operated, so that the manipulation of the same may only be laccomplished ley-an authorized person or ersons.:V With the foresoingend ethefeeuallyimportantobjects `and advantages 1in view/, -the invention resides inthe kcertain new and useul combination,,construction and arrange.-l

ment of Lpar-ts and circuits as will loe hereinafter more fully' describedfset forth in t-he appended claims, .and illust-rated inthe a'ccoinp anying; drawings, :inrwhich Figgaire 1 isa top fplan "View ofla @practical minemment of then'ventonwth the cover pcrtionthrcfremved, j

erigere s is a vertical 11o' `"rudtnalfsctien tafken on theliiief'T-Zt 1,

` Figure isM avrti'icalitr talrenonthel 63;3 4fFiitifrel Fijlireil 1s' j ersp'l' .e lo

the individual switch lnni-V he'rslare tolj'operated.

Figure 5 is a diagrannnatic viei'voifianarrangement oi "ci'ciit" connections to :the Tim'- cover .in place". Any suitable, sealing means )proved .testfblock for testingprotectiverelays "Ffgure 6 is aj view y s imilarto 'that of kFigure Q5, but shavingen; @Heil-sment if Cil'- cuit confnection s employed ,'i'or t'esting variouselectr-ical.measuring"instruments.

Reffefmfrt@ f the 1 drew-mss, wherein like chalracter'sof .reference-designat-e correspondagree'ementnewer'views.eeeof?, the embodimentof the,invention',asrshoivn fcc "thereinbvway o-eiiample, comprises a base .iblroolr 10,. vvh ili.is preferally of rectangular l al suitable 4insulating material, and-1s fprovldedvvith posts or the .lilrefll rising from each o 'fits'corners to sup'- 65 port thereon a cover 12. The cover 12, 'which mayiloe of metal, or any other suitable or desired material, has j s'ide andiend'flang'esdepending. from its top; Wallfivlrich snugly e'ngafgejabout the oppositesicleandend edges 170 suitable openings to engage over 'the upper threaded endsof the posts 11. Thesefthreaded en dsfof fthe posts 11 are preferably of a reduced diameter t'o provide shoulders `at,' their lotve-r connected ends on which the cover 12 rests vhen placed in position yon the lease 10., vand 'nuts A13 are engaged fon the '.tlirea'dedwends of posts 1 1 to secureA the Knot einem@ eempldyzd. in comme@ with the cover secur'ngnuts 13 to Kp re'v e'ntft'lie unanthori'zed removal 4t'h'e saneivhen Ithey are Helly iplf' ,ingestion on the reen, as wheathetstbibekgn its entirety, has been instaled itsoperative-posift'ion.

@semifinfalle] downwardly through the base to have their lower ends electrically connected to circuit leads tobehereinafter designated. The

seveial stationary contacts of each parallel set of the same are preferably of rectangular metal block formation and` arranged in transverse alinement with their-,opposed end edges bi'furcated, as at 24; Toretain the contacts of each transverse pair thereof in position with their bifurcated ends inthe desired opposed relation, pins or studs vare engaged in the base 10, and the contacts,at ,o-Iieside of the respective contact studs or screws 14", 1 16, 17, 18', 19, 20.', .22. and123 for the purpose.

Disposed on the and midway between each pair Vof the complemental stationary contacts 14, 19,15, 20; 16, 21; 17, 22; and 18, 23 are bridging contacts or switch blades 26,27, 28, 29 and 30,

respectively, which are each preferably mounted vfor quarter turn movements only on the upperY end portions of pivot members yor screws 31 beneath the heads thereof,sub stantially as shown, suitable supporting membersor washers 32 being positioned on the bolts or screws 31'beneath` the bridging contacts or switch blades 26, 27, 28, 29 and`30 to aline the same with the bifurcations in the stationary contacts with which they cooperate.

Formed in the upper face of each ofthe bridging contacts or switch blades`26, 27, 28,

'29 and 30 are a pair of slots or recesses 33,

which are preferably arranged in alinement at opposite points'diametrically of the headed portions of the pivot members or screws 31 associated therewith. Th-ese slotsy or re-' ycesses 33 are to be engaged by the complemental projections 34 formed lat' the lower end of a key 35, by means of which the bridging contacts or switch blades 26, 27, 28, 29

and are tol be actuated' to circuit closing or on and circiutopening or onf positions of operation withres'pect to the complemental' pairs of the stationary contacts aforesaid.

Y Between the projections 34, the body of the the upper headed portions thereof. These "bridging contacts ,or switch bladesV 37 and 38 are each also providedwith'slots or'recesses l33 inthe upper faces of the same fortli'e enlrey is recessed, as at 36, to a depth sufiicient' to admit of theV straddling ofthe headed portions of the pivots 'or screws 31..,by the same, and to allow for the proper engagement of tlieprojections 34 with the slots or recesses 33. l

' Also'disposedon the upper side of the base 10, preferably-between the stationary contacts 15 and 16, on the one hand, and the contacts 16 and 17 onthe othery hand, area pair *of identical bridging contacts or switch blades37 and38', Awhichvare mounted for v`limited turning. linovemens on .pivotsV Aor screws 39 and40 respectively, and beneath upper side of the .base 10V 38 therewith, the stationary contacts 16a1id l 17 yare also'bifurcatedat their 'outer ends, and after thesame manner as the formation of thebifurc'ations 24 at tlieinn'er ends of all kof the several contacts 14, 15, 16,17, 18,

19, 20 21, 22and 23, inclusive. Asv bestV shown "in Figure 1, the opposite'ends of the bridgingl contacts or switchblades 37 and 38 are angularly offset in opposite directions,

wherebythe inner ends of the same will en-v gage the bifurcations at the` inner ends of the f stationary contacts 15 and 16, and the opposite orouter ends thereof with the bifurcations `at the 'outer ends of the stationary contacts 16 and r17, the purpose of which arra-ngement willbe hereinafter morefully explained.' To allowfor thedesired engagement of the opposite ends of the bridging contacts or switch` blades 37 'and 38 in the bifurcations of the stationary contacts 15, 16 and 17 as Vbefore indicated, suitable supporting membersV or washers 39asimilar tothe supporting members orvwashers 32 iwill be engaged on'the i i pivotsjor screws 39 and 40. l In-Figure 5,-the improved test block, as

ythus constructed and arranged, is shown con-- nect'ed in a circuit for testing protective relays or the like,` the circuit connections where- Aof'beingas follows: from the three terminals ofa current'y transformer T, coupled to the main line'conductors a, b and c, tap offs'40,

41y and 42are connected directly to the binding studs or screws 1 5, 16 and 17,fof thc stationary contacts 15, 16 and 17 while two conductors 43 and 44 from a control sourcc (not shown) lead' to.l and connect the binding studs or screwsv 14 and 18 of the stationary : contacts 14 and 18,"a trip coil 43afbeing, as

usual, connected ginon. the conductor 43.

The several stationary contacts 19, 20,21, 22

and 23 are, iii-turn, connected respectively by thejciicuit leads 45, 46, 47, 48 and 49 of av pair of protective relays 50. All of the-foregoing rvcircuit 'connections are to 'bc'hercinafter designated' asthe permanent circuit'- connections of this particular testing sys-l tem, as distinguished from the following teniporai'y test circuit connections: a pair of coLnductors 51 and^52 are lead from the stationary contacts 19 and 23v toan opei'ation indicator (not shown) ,and a second pair of con-" ductors 5'3 and k54 from the stationary contacts 21 andl22, the conductor 53 leading 55, ywhichvhas its other terminal Yconnected to the other side of the latter circuit by a conductor 56.

. In the operation'ofntlie test block this hook up of'circuits, and with the temporary' circuit conductors orleads 51, 52, 53 and 54 7 disconiiecfed from the stationary contacts 19,-V

23, 21 and 22 respectively, the transformer short circuiting-bridging contacts or switch blade-s 37 and 38 in oli position, the line bridging contacts or switchV blades 26, 27,

' 28, 29 and 30 closed, and the main line circuit breaker (Z closed, the relays 50; will be operatively connected to line a, b, c through transformer T. `New to make a test on kthe relays 50, the temporary conductors or leads 51, 52, 53 and 54 will be connected to the binding studs or screws 19'23, 21 and 22' of the stationary contacts 19,23, 21 and 22, in the order named, when the bridging contacts or switch blades 37 and 38 will be closed on the stationary contacts 15, 16 ,and 17, thereby short-circuitingthe transformer T, and thenthe bridging contactsv or switch blades 26, 27, 28, 29 and 30 opened. The relays-50 will now be completely disconnected from the-Y otherwise permanent line circuit connecbv the conductor 44' to the main lead c',

while the stationary contacts 15, 16 and 17 are connected by the conductors 40', 41 and 42' to the three terminals of the current transformer T', as in the first instance. The several stationary contacts 19, 20,21, 22 and 23 are connected to the circuit leads 45', 46',

47', 48 and 49' to the bank of electrical meas-A uring instruments to be tested, after the same manner of the previous connection of the pro.- tective relays 50.

For the purposes of the present invention, the foregoing described connections also constitute the permanent connections for the test block, while the temporary test connec-` nections are to be made as 'follows A conductor 51' will be led from the stationary conl tact 15 to one terminal of a test meter 55', a second conductor 52 from the stationary coiitact 17 to a second terminal on the `meter 55', a third conductor 53 from the stationary contact 20 to a third terminal on the meter 55',

and a. fourth conductor 54' from the stationary contact 22 to a fourth terminal on the meter 55', while the three main terminals of stationary contacts 15, 16 and 17,'but, after the temporary testfwiring is properly con-V nected as liereinbefore indicated Jfor the same,

theY line bridging'contacts or switch blades 26, 27 28, 29'and 30 are opened, with the result that the current from the main line translformer 'I" is shunted through the. test meter 55 asis required. v

blades 26, 27, 28, 29, 30, 37an`d. 38, the top To admit of the engagement of the key 35 v with thevseveral bridging contacts or switch wall 'of the cover 12 will be provided with a corresponding number ofv openings Y therein forfthe purpose.

Vithout further description, it is thought.

that the featuresk and advantages of the inslilled in the art, and it will of course-be understood that changes in the circuit connections, and in the type and value of the devicesem'pl'oyed may be resorted to, without departing from the spirit ofthe invention or its scope as claimed.

vventionfwill be readily apparent to those Y Having thus fully described the invention, t

what is claimed is: f

1. In a deviceof the class described, a base of .an insulating material, a plurality-0f line switches spaced alongr said base and separate Y switching elements mounted on said base and cooperative with the contacts at one side or (l the adjacent of Vcertain of said line switches,

whereby to short circuit the same whenever desired or necessary.

2. In a device of the class described, aV base ofanjinsulating material, parallel 'rows of evenly spaced contacts mounted on said-base, a switch blade for each pair of oppositely disposed contacts, and separate switch blades cooperative with certain Vof the contacts in one of the rows thereon onlyv to short circuit E,

theV same whenever desired or necessary.

3. v In a device of the class described, a base v of an insulating material, parallel rows of evenly spaced contacts mounted on said base, switch blades mounted on said base one between each pair ofthe oppositely disposed contacts, said switch blades being arranged for limited horizontal rotative movement relativeto the complemental of said contacts, and separate switch blades similarly mounted on said base and between certain of the said contacts at one side only of the tirst named ,switch blades whereby to'short circuit the same whenever desired or necessary.

GUYN. HUGHEs.

the meter 55' will be 'connected bythe conductors 57, 58 and 59 directly to the mainline leads a', b' and c', respectively.

In the operation of the test block in this instance of its practical application, it is not necessary that the transformerr T be shortcircuited through the closing of thebridging contacts or switch blades' 37 and 38onto the lll)

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