US1233192A - Cut-out for electrical circuits. - Google Patents

Description

N. l. CCVNHAI)A CUT-OUTFOR ELECTRICALCIHCUITS.

Patented July 1Q, 1917.

3 SHEETSSHEETI l 9 u w APPLICAT|)N FILED OCT. I6. 1915-/ N. 1. CONRAD. CUT-OUT FOR ELECTRICAL CIRCUITS.

I AP-FLICATION IFIIE!) 0CT.16, l9|5| Patented 10,

3 sniirslsnzsrz.

4To all whom z't may concern:

` Chicago, in the county of Cook and UNITED STATES PATEN OFFICE.

NICHOLQLS J'.4 CONRAD, 0F CHICAGO, ILLINOIS, ASSIGNOR TO SCHWEITZER & CONRAD, INC., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CUT-OUT ron ELEc'rnIcAL CiBcUITs.

Be it iknown that I, NICHOLAS J. Com-LAD, a citizen of the United States, resldln at of Illinois, have invented a certain new and i useful Improvement in Cut-Outs for ElectricalCircuits-of whichthe following is a full,.'clear concise, and -exact description, reference'being had to the accompanying drawings, forming a part of this specification.;,.'.'

My invention relates to cut-outs for electrical circuits. Onlines employing" hi h voltages,- fuses are desirable .to protect t e ,apparatus and circuits just as nuchas in Y low voltage work. While in low and mod-` erate voltage work and especially in small capacity circuits the fuse may-be replaced while' 4voltage is` upon ltheiline without dantaken w or -large amounts of power Vare to be dealt with. In such case, especially where voltages are employed, thel fuse' cannolile- 4 tion of the lower end of the fuse 'handle carrying the same;-

Fig. l is a front elevational view of-'aj replaced in. the hne while voltage is on without great danger totheoperator. -In small powerfwork it is common 'to 'insert a knife ,or snap "switch in the circuit and when a fuse is to be'replaced the-switchl is opened.A

0n three lphase systemsopening of one ling" uonly would be im racticable. `As a result?` -`fthe so-calle'd `cut-out has been develo-ped. I n general this com "rises a: swltching block or blade removab e fro`n`1` the .line terminals, this block or blade having incor-4 rated therein a fusiblelinkoroonducton The .block ,inay be withdravvn"completely' from the' line terminals in 'order'tojmspect or repair the same without slubjectin =th`e.

operator to 4dan r from the line. vo tage. Where the fusi le link comprises a soft I metal conductor the construction is Vrelatively simple, but for high lvoltages or forlarge capacity such type of fuse Acannot be' employed anda diflerentformpf f use and mounting must rbe provlded.

tate.

vI have illustrated E? to4 the' cgierat'or,V special precautions must y ere 'high voltages are employed Vof one -orm of'fused cut-out,

The cut-out, which I' shall-describe is def si ed to employ a particularly efficient fuse o the type disclosed in the patents to Edmund O. Schweitzer and Nicholas J. ConradNos.- 1,050,493, .1,033,384 and lloosaee,

but it is to bf.: understood'that any ot er suitable fuse or link may be employed.

n is desirable that the cut-out be made` as compact as possible; that the structure be completel weather-proof for outdoor instal`v lations; l at the operator be suitablyprotected while' manipulatingthe device and that a suitable indicator be rovided -for in-V dicating from the outside t e condition of `thefuse.

The'v object of this invention is to provide a cut-Cut or. fuse 4block which will embody' the above and other advantages.

In. the accompanying drawings in lwhich' an embodiment of my n-' vention- Fig. 2-is an'elevation of the same; i

Figure 15s a longitudinal vertical seccinl Fig. 3 is'a fragmentary view of the posiand the .modified form of the invention; V

Fig. 5 is a detail view showin-g the top of the ,handle-.or mounting of ``the fuse holdv; Y

Fig. 6-is a bottom plan view of the shell "or casing shown in Figs. 1 and2;

Fig. 7 is'fa' fragmentaryv elevationy ofl ,a 4

fuse mounting voltages; Fig. 8 is a cross-sectional view of a form of a devicemplo'yirig a 'resistance which is inserted. in broken; and

Fig. 9 illustrates out a fuse.

'block and handle for high ai connecting -with- The lfuse 1 which preferabl his of the 4type y the circuit before the circuitis disclosedin the above-men ioned patents,

comprises a glass tube 2. provided at the."

top with the cylindrical terminal 3 and at -the bottomV with asimilar terminal Ll-whic h vcontains a 'lexibleconductor 5, surrounded .by a coil spring 6and a transparent arcuextinguishing liquid 7. The terminals 3 and 4 are formed in the shape of'ferrules whichy embrace the ends of the glass tube`2.. `I shall not4 describe this particular. type of".

fuse in detail. Suice it to say that upon blowing of the Afuse the conductor 5 is re L and the top opened so that the hot gases //ormed by blowingMmay escape from the open glass tube j.,t'hrough the vent in the sleeve and out/beneath the petticoat as is shown in-the arrowsri'n Fig 1. The fuse 1 i is surrounded by an insulating shell 8 which may/lie constructed of fiber impregnated with bakelite or the like, or any suitable weather-proof insulating material. The top of the tube 8 is provided with a cap or a hood 9 which closes off the open end of the tube, and forms a.V petticoat for the parts later to be described.

The upper end of the tube 8 is provided with a series of apertures 10 which open into the space 11 between the hood and the tube. The gases that are evolved :upon blowing of the fuse 1 may escape through the apertures 10 and the space 11, and are thus diverted completely from the hands or the face of theVK operator.

A suitable sleeve 12 which comprises a metal band encircling the terminal 3 is secured upon the inside surface of the insulating tube 8 and forms a stationary line terminal.

This terminal 12 is provided with a. plurality o1' spring fingers 13 which are arranged to make separate yielding contact with the terminal 3. The flexible lead wires 14 which are preferably stranded cables are secured ai; the inner end to the metallic ring Y 12 and at their outer end are provided with -a suitable connector 15. The lower end of the insulating tube,8 is surrounded by a short sleeve 16 which is secured thereto by a waterproof` joint. The lower end of the tube 8 is provided with the metal sleeve 17 which comprises a ring of metal having the spring fingers 18 extending upwardly and embracing the terminal 1l of the fuse 1. The stranded cables' 19 are secured to the sleeve 17 and are connected together to the connector 20 at their outer ends.' A metal sleeve 21 is mounted on the inside of the insulating sleeve 16 and is'secured by pins or the like to the insulatinv tube 8. The fuse 1is mounted upon arsultable. mounting block 22 which is provided with a handle 23 at its lou er end for introducing the fuse in place in the sleeves 12 and 17.

A short cylindrical metal block ortop 2l'- is interposed between the terminal 4 of the fuse and the mounting block 22. The block 24 is secured l0 th mountingblock 22 by suitable screws 29 or the like and is secured to the terminl 4 of the fuse 1 by means of a short threaded stud 25, shown in dotted lilies in Fig. 1. The/metal blocki 24. is provided with a threaded Socket for receiving the stud 25 and is provided also with a small counter-bore in which lies a spring washer 28 for locking the parts together. A suitable guard or deflector 30 is placed between the mounting block 22 and the handle 2,3. This deflector serves to deiect from the hands of the operator any gases that may escape down through the tube 8. It also serves to close ofi` the bottom of the sleeve 16. The metal top 24. of the mounting block 22 is provided with a pair of oppositely 80'; disposed pins 31.' The pins 31 are adapted to coperate with suitable slots to form what is known as a bayonet joint so that when the pins 31 rest in the uppermost and inner end 32 of 85 the slots the fu'se 1 will be securely held in place in the sleeve sockets 12 and 17. The sleeve 16 is provided with suitable indications 33 upon the'outside thereof for-indicatin 1r the position which the pins 31 must 9g take before the fuse can be inserted. When the p ins 4are in line with the indications 33 they will clear the metal sleeve 21, being then in register with the notches 34 that are formed in the metal sleeve 21. The notches 34 conununicate with a slot 35 disposed at right angles thereto and this slotconnects with a verticallydisposed slot 36 which in turn communicatesat its upper end with the horizontally disposed slot 32, above mentioned.

It can be seen that for the insertion of the Afuse 1 and mounting block 22 into place it .final turn to the right and the fuse, and the block are then firmly held in place.

If by chance the fuse should'be inserted 115 upon a line which is'short-ircuited' there would be a tendency for the fuse, the 'mounting block and the handle to be kicked outward out of the han'd of the operator. To prevent this as well as to prevent dropping 12' o'f the'fuse and mounting block I have provided'the double bayonet joints. The pins 31 are in'the'vertical portion 36 of the slot when the circuit is closed between the lower terminal 4 and` the socket. AI f the fuse blows 125 at this time, the recoil or kick will be taken up by the pins 31 resting in the horizontal portion 35 of the slot.

I wish to call particular attent-ion to the fact that the top of the fuse 1, from which sleeve of insulation 42 between ing foggy `from smoke,

ferrule 4 enters the sleeve 17. Even if they sleeve block and handle are kicked down by explosion of the fuse, Sleeve 12 will still be in contact whenV the pin 31 is at the end of the slot 36.

Thus there is a gas seal Ybetween the explosion orare chamber v which is formed in the top of the sleeve 8V above the fuse and the bottom of` ,the device.

, A suitable mounting bracket whichepreferablyconsists of the base 37 and the cap or yoke 38 provides for mounting the cut-out upon a cross arm or the like.' The main sleeve or tube 8 is provided with apertures near the top of the fuse and-a pair of'small" transparent'windows 39 are held over these apertures by means of' a collaror sleeve of insulation 40 so that the operator or attendant may sight through the windows 39 to ascertain the condition of thefuse 1. It is to be understood that whenj the fuse has blown the coil spring 6 and the flexible conductor will' be moved downward and will no longer be visible through the windows 39 so that a clear view may be had through this window. l 4

y For an-egtposed or outdoorinstallation in which thereis danger of thewindow becomsoot'or the like, I provide a band .or sleeve 41 which is let into the sleevev40 and has an aperture cooperating withf'the opening 39 which aper` 'turemay be brought into register with the opening 39 by rotating the band 41.

For especially h'igh voltages I employ a the -coperating parts ofthe mounting clamp 37, 38, as

, shown'ln Fig. 4.

i minal 4 is provided with an extension ,45; leif-llglhf `s rrounds the lower end ofJthefusegand ,is

in direct contact .nal 4. 'It is' [to be'noted-"infeaehofthe forms shown that the upper terminal 3jofltli'e fuse 1 is of'a slightly lessfd'iameter than the lower W5 i I employ van insulator' voltage insulation, the 'handle protected by-a petticoat 43 asshown in 4 and to. secure this v 44 ofsuitable material between the mounting block 22 and the 4handle 23. 4As shown in Figui-this insulator 44 maybe provided ,witl'a plurality of `petticoats and mayinffacbconsist of a regularline insulator.

For high 23 is Fig..

InFig. 85 I have shown amodiiication of the fuse arrangementfin that thelower teresi stance finaterial which with' "the annular.. termiwte'rminal 4 and' the contactsleeves. 12 and` 17 the ferrule 3 and thev type' of insulation,

l 35 brings the upper terminal intoccntactjwith the sleeve cause engagement of Vsleeve".1.7. 4Upon `u are made of corresponding sizes. The nal 3 is also of greater axial length than the terminal 4 andwhen the fuse is withdrawn from its mounting the connection will-first` be broken between the terminal 4 and the socket 17. InY the form of. cut-out shown in Fi 8 the lowerterminal 4 of the vfusel wi leave its socket 17 which will thenmake contact with the resistance 45,before} `the circuit is broken and thus not onlywill fthe varc which tends to be formed be lessened, but the disturbance in the circuitfoaused by breakin the How of current will also. be less. T e resistance 45 serves as an initial and final contact to carry the are whenthe fuse '1s' inserted or withdrawn.` i'

If itis desired to omit the fuse 1a connecting link, such as shown in Fig. 9 may-- be employed instead.,l Such a connecting link consists of a body 47 of. insulatlngrnaterial provided `with the usual terminals 3 and 4 which are" connected together by a.. wire 48 or othersutable conductor' which passes through .the body y WVithsthe dummy fuse 46 the device operates merely as a cut-out or switch vfor opening the-circuit.

provided a yparticularly feiiicient land economical cut-out o'rfuse blo'ckwvhich.isi'protested lagainst 'disturbance 'from thel ele- It can be seen; from theabove that JI-:hav'le ments and which is Acons'itrllic'td ftj guard'the l operatoragainst injury pins aindf the coperatingv grooves form 4readily releas.

able` detent means for closing'the openfend of the sleeve or tubev 8 'and 'for' connecting and disconnecting the' useffrom'its; sockets.,

he flexible conductors 14"' 4 or terminals.v and 19 which yconnect with, the stationary terminals give ample current. carrying capaoity but lat the same time ifo'rm' flexible leads forattachment to thefcicuit conductors. The employment of-a number oii'iexiL ible cables side by'side to forimaronducting lead of suflicientjcapacity-allows of-cnvenient attachment to the stationary termi- `nals,:and at 'the same time occupies the least;

` 4 of the cutsout" -The -fuseis inserted vin two-stages, 'the vfirst.

space radially of the body stagewhen the pin is'` inA thefl-iorillontal slot 3 '0f the fuse l gether... y., i While 'I'have shown andj-describe'dmyin- 'ventionjfw-ith reference tothe 15:n.titiiilarfIdetails of construction of, oneembodimeLfitis.

and with numerous.

not, the. terminal 4 with the? fthe andwhen the pinl is in the slotB21/hej1`Jfarts.. I fare4 ur properposition andare secureditoto beunderstoodthat the inventionlinay ap- -I Apear `in -diiferentforms' suggest them's'kyhs to one skilledin the art. But` I consider-"all such modifications and variations to be included within the spirit and scope of my invention. What I claim is: p

1. In combination a` straight cylindrical sleeve of insulating material adapted to bel placed in a vertical position, said sleeve having the walls adjacent its upper end aper-V tured to form vents, an annular contact lying against the' walls of said sleeve below said vents, a cylindrical cap of insulation secured to the top of said sleeve, said cav being undercut at said vents to form a petticoat for said vents, a pluralityl of flexible stranded conductors lying side by side in the Aspace between the petticoat and the sleeve and vhaving their inner ends secured to said annular contact, an open annular contact lying against the walls of said sleeve adja cent the lower end thereof, a cylindrical Sleeve secured to the lowerend of saidrst sleeve, said latter sleeve forming a petticoat about the lower end of said .rst sleeve, said petticoat being recessed, a plurality of stranded `flexible conductors lying side by side insaid recess andbeing connected to said lower annular contact,` and a cylindrical -fusehavingcontacts which are adapted'tobe embraced by said annular contact, saidlfuse ,being or anized to discharge the 'gasjes of the arc rom 'the upper end vthereof '.upon blowing, said gases being dissipated through.

said vents`in the walls of the irst sleeve.

2. In combination a straight cylindrical sleeve of--nsulating material adapted to' be laced in a vertical position, said sleeve havlng the walls adjacent its upper end apertured to form. vents, an annular conct secured to thetop of said sleeve, said cap being undercut at said vents to form a petti*v Coat for said \vents, a plurality of Aflexible stranded conductors lying side by yside in the space' between the Petticoat and the 'sleeve and having their inner ends secured to'said annular contact. 3. In combination ae straight' cylindrical Asleeve of insulating material adapted ,to be placed in a .vertical position, said sleeve aving the walls adjacent upper end apertured to form vents, an annular contact lying against the walls o f said sleeve below -esaid vents, a cylindrical cap of insulation secured to the top of said sleeve, said'cap being undercut at-said vents to form a petticoat for vsaid vents', a

the spacci?L between the 'Petticoat' and `the sleeve andfhaving their Inner ends secured to Suid annular contact, an open annular contact 'lying againstthe walls of said sleeve adjacent the lower end thereof, a cylindrical sleeve secured to the lower end of the lsaid -contact being adapted to embrace the con-A 4ar, ljgd'nta'cts, said fuse having a normally 40 lying against the walls of said sleeve be w oldI said vents, a cylindrical cap of insula on ililg relation with said contacts,.and closing plurality /of flexible. stranded conductors lying side by side in rst sleeve, Vsaid latter sleeve .forrnln a petticoat about the lowerfend of said st sleeve, said petticoat being recessed, a -plurality of stranded flexible conductors lying side by side in said recess .and being connected to said lower annular contact.

4. In combination a straight cylindrical sleeve of insulating material adapted to be placed in a vertical position, said sleeve having the walls adjacent its upperend apertured to form vents, an annular contact lying against the walls of said sleeve below said f vents, a cylindrical cap of insulation secured' to the top of said sleeve, said cap being undercut at said vents to form a pettioats'o for said vents, a plurality of iexible strand ed conductors lying side by side in the space; between the petticoat and the sleeve and' having their inner ends secured to said annular contact, an open annular contact lying against the walls of said sleeve adjacent the lower end, thereof, a cylindrical sleeve secured to the-lower end of the said first sleeve, said latter sleeve forming a -petticoat about the lower end .of said first sleeve, said'- petticoat being recessed, a pluralityv of l stranded flexible conductors lying side by side in said recess and being connected to l. said lower annularcontact, said annular K 9,5; tact of a cylindrical fuse.v l' 5. In combination a cylindrical sleeve having at itsupper end a vent opening freely int' tle atmosphere, v a petticat covering said vent,l an` upper stationary contact in l0( said sleeve, a lower stationary contact in said sle'eye 'ahd a cylindrical fuse inserted axially intd conducting relation with said stationan explosion or ar'c space above said upper contact, a lower stationary contact, said contacts being mountedl on said sleeve and in- 1 sulated from each other, la cylindricalfuse having termina-ls coperating with said ebntacts, said fuse havingits one end\ adapte"d to be opened by blowin of the fuse, saidv fuse being inserted axial y into circuit closhe explosion o r arc space from the opening through which the fuse is inserted. x 4 In combination a cylindrical sleeve, an upper stationary contact mounted inv said sleeve, a lower stationary contact mounted. in said sleeve, a fuse comprising a cylindg'ii. cal body .of insulation having upper and lower contact terminals', an arc extinguishing liquid in said body of insulation, said fuse having its lower end permanently closed i axially -1 and' closin and'having its upper end provided with a normali closed vent, a conductor within the bo y of insulation vvjonin said terminals, said fuse having means or breaking the circuit between said terminals, and simultaneously 'dischargin the gases from the upper end thereof on y, saidA cylindrical sleeve having a vent or vents freely opening ifnto the atmosphere adjacent said end of the use.

8. In combination a cylindrical-sleeve, an upper stationary contact mounted in said sleeve", a lowerstationary contact mounted .in said sleeve, acylindrical fuse inserted ing relation to Said statioaryA Contacts, Said axially', said fuse being' in current 'conductfuse having terminal contacts Vof different diameter and having means for discharging gases from the 'end having .thecontact of smaller diameter when the fuse blows, said sleeve having ventsopening freely into the atmosphere-to discharge said gases.

9. In combination a cylindrical sleeve, a

stationary cylindrical contact mounted in said'sleeve, a'seco'nd .stationary cylindrical contact, mounted ,in sa1d"'sleeve, said contacts being spaced vapart from each other,V

an Iincflosed cylindrical fuse having cylindrical terminals coperating with said sta'- tionary contacts,' sai-d'fus'c being` inserted off the upper' end front the-s ac cbelowt 'e first cylindrical sleeve `f f ing meansfor opening one endi'thereof when n A mosphere at said end of the fuse.'

and-f ormin agas seal, the upper endof said' sleeve ing completely closed off by said s eal `fromfsaid'lower end, "said'fuse havtlie fuse blows` and said sleeve havingopcn vents directly communicating "with lthe at- 10. combination a cylindrical sleeve, an upper stationary contact mounted in 4said sleeve, a lower stationary contact. mounted in' said sleevef afcylindrical closedA fuse having terminals thereupon, said fuse being moved into conducting relation with said 'stationary'ternnals by inserting the same axially;l into: said sleeve, `s aid'lovver stationary terminal being of `greater diameter than said" upper' terminal, sald4 fuse having means for; opening one 'end thereof when the fuse,

" ,blowj s,1iand said sleeve 4having open vents tionaiyt contact's, a cylindricalfuse inserted- -tactsln `said sleevejs'aid sleeve having" an explosion chamber thereirrabovesaid'npper staaxiany-'insaid sleeve and t para thereof lying Within each of` said contacts, said mak-. ing contact with saidas'tati'onary contacts, at mounting' block secured to sald. `fuse, a handle 's ecured to saidA mountingV block and mennavvithi'n my movement of. 'sand Contact.

directlylcommunic'ating' with said end of the Petticoat.

E sleeve for preventing fuse, said 'means c'omprlsing 'a bayonet 'slot lying Wholly within said sleeve and a pin mounted on `said mounting bllock, said pin. being adapted #to` enter said sot. f

12. In combination a cylindrical sleeve, a pair of spaced stationary'contacts in said sleeve, a cylindrical fuse `1oin1ng said con,

tacts, a petticoat coverfor the top of said sleeve and a petticoat cover for the bottom of said sleeve, and flexible connecting leads passingI under said petticoats vand secured Aconductively to said stationary contactsr said sleeve having a vent or vents communieating with the atmosphere under` said upper l'pettc'ont, said fuse being' adapted to blow outfat one end and discharge through said vent,

pair of stationary annular contacts mounted in said sleeve, said contacts vbein apart, a cylindrical fuse fitting into and connecting said contacts, said fuse being mounted axially of saidsl'eeve, said sleeve having an laperture or vent adjacent the upper end thereof, a ca vclosing 'the top of said sleeve., said cap'liaving a cylindrical petticoat over said aperture, a ieXible stranded conductor passing beneath petticoat and 'through ,said aperturelan'd connected to 'said r upper stationary annular 1.3Lv In combinationa cylindrical sleeve, ai

spaced 14.*In combination a cylindrical sleeve, i,

' having a pair of 4annular contacts mounted therein andfitting within vthe side walls of said sleeve, said contacts being s aced apart, a cylindrical fuse fitting lnto lan "connectmg sa1d'jcontacts, an aperture or vent adjacent the top of said sleeve, a cap for closing' the top-of said sleeve, said cap havingta petticoat over saidapertureysaid sleeve having .sightopenings therethrough adjacentthe top of saidl fuse, said fuse being adapted to blow out of one 'end thereof Iand to give an indication of the same. y

15. In# combination a cylindrical sleeve', having a pair of stationary annularcontacts 1nounted therein and fit"ti`t'xg` around the inside walls of said sleeve, a cylindrical.

use .fitting into and connecting sadscontacite, a petticoat secured tothe lower end, ,of said sleeve and having a cylindrical portion extending below the same, a flexible stranded conductor connected to saidlower stationary` contact and passing under said 16. In combination a` cylindrical sleeve yizo " having av pair.of-stationaryfv open annular contacts mounted therein and fitting against 1 -fuse' ,being adapted to ih e' insertediintc sleeve', saidilatter sleeve :having a cylindrithe side Walls Vof said `sleeve ,a cylindriy f 'cal fuse `connecting said lcontactfs, said both-. of `said annular contacts, -a1noi1`nting-4 locksecured Ito -said ined-an enlargedsleeve. secured ltoi the .lower l:end ci ,lfsaidl Y*first "tions'on the ends thereof, a mounting b ock secured to said fuse, a handle secured to said mounting block, a metal plate havin a bayonet slot, said plate lying wholly wiiin said sleeve, and a pin on said mounting block, coperating with said slot to hol said block and fuse within the sleeve.

18. In combination a cylindrical sleeve member, a pair of spaced stationary open annular contacts mounted on the walls ofA said sleeve member, a fuse having cylindrical terminal -portions adapted to coperate with said stationary contacts, a' mounting blockse'cured to lsaid fuse, a bayonet slot in said sleeve member and a pin secured to said mounting block, said fuse being organized .to discharge the gases of the arc axially from .erregend thereof.

'19. In combination an external4 insulating supporting sleeve having a pair of open annular contacts mounted on the .inner walls thereof, a cylindrical fuse member having metallic ferrules forming contacts on the ends thereof, the upp'er ferrules being'of greater length than the loweli ferrules, said fuse being organized to discharge the ases of the arcv axially from theupper end t ereof, means comprising a handle for inserting said fuse axially into said annular contacts and means for holding said fuse and han dle against "outward movement after said fuse has engaged the upper contact, and beioreithas engaged the lower contact, said means comprising a double bayonet slot and a 'pin movable into and out of saidtslot.

20. In combination a cylindrical fuse member organized to discharge the gases of the arc 'axially from one end thereof, a cylindrical mounting block coperating with screw threaded parts for securing saidafuse memberandfsaid yblock in axial alinement,

and ai sleeve member inclosing said "fuse ,member and said block, said block and said sleeve,haf'vivlg coperating locking means for holding. the parts together, said locking meanscomprising a double bayonet sloty and a pm.l l

Y 21. In combination a cylindrical sleeve member, having stationary annular contacts therein, a cylindrical fuse member having terminal portions adapted to coperate wlth vsaid, stationary contacts, said fuse member "beingorgamzed to discharge the gases of thev arc axially fromone end thereof, a mounting yblock secured to said vconnectingmember and vcinterlocking 'parts on said' mounting' block-and said sleeve member for securing said Im'rts together, lsaid partscomprising a double bayonet slot and a pin movable in from' one end thereof, a mounting block forv supporting the fuse, a slot in said sleeve member, said slot comprising two vertical portions and two horizontal portions and a pin on said mounting block coperating with said slot.

23. In combination a sleeve member having stationary annular contacts therein 1ying against the walls of the sleeve, said contacts being spaced apart, a fuse for connecting said contacts, said fuse being organized to discharge the gases of the arc Vaxially from one end thereof, a mounting block secured to said connecting member, said sleeve member having a slot therein and said mounting block having a cooperating pin, said slot comprisingl two vertical and two horizontal portions.

24. Incombination a cylindrical sleev member, having stationary contacts therein, a cylindrical connecting member having contact portions engaging said stationary contacts, a mounting block secured to said connecting member, said sleeve member having a petticoat surrounding said mounting block below said statlonary contact, said mounting block having petticoated insulat-v ingmeans secured thereto below said petti- 26. In combination a cylindricalY sleeveA member, an annular stationary contact. .member mountedadj acentthe lower end thereof, a, stationary contact member adjacent the upper end thereof, a cylindrical fuse means' adapted. to be inserted' axially and lie Within said stationary contact member for connect-- 111g th same, resistance means connected to the lower end of said. fuse and'means for moving said fuse axially -into said ationary annular contact and against'said upper stationary contact whereby the lower stationary "annular contact member is brought into contionary tactwith the resistance means in series with the fuse. v

27. In. combination a sleeve member, a stationary contact mounted in the upper end thereof, a contact member mounted in the lower end thereof, a cylindrical fuse member havingte'rminals adjacent the ends thereof, said terminals connecting with said stationary contacts, resistance means connected to said lower terminal, and means i'orbrin,f ,1ing

one end of said resistance 1n contact with said lower contact after the upper end of said fuse means engages said upper contact means and before the lower tern'linal engages the lower stationary contact.

28. In combination a cylindrical conductq ing member having a metal ferrule adjacent the end thereof. said ferrule having its end fared ntl' normal to its axis, a threaded stud secured thereto, a mounting block having a threaded socket for receiving saidV stud, and a spring washer between said ferrulc and lsaid mounting block, said mounting block ha ring its top surface faced ofi' norlnal to its axis to abut against the end of the fuse ferrnle and haring a circular recess for said spring washer.

2E). In combination a cylindrical sleeve of insulation, a pair of spaced stationary contacts in said sleeve, a fuse connecting' said contacts, said inse comprising a glass tube having metal fer-rules for connecting said spaced stationary contacts, Said sleeve having diametrically opposite apertures therethrough, said fuse having an element normally lying in line with said aperture to obstruct the passage of light therethrough and adapted to be moved ont of said line upon blowing of the fuse and means for closing said diametrieally opposite apertures.

30. In combination a vertical sleeve of insulation, a pair of annular contacts lying against the walls of said sleeve upon the interior thereof, said walls having diametrical apertures therethrough intermediate said annular contacts, a band having apertures adapted to be brought into register with the apertures in said sleeve and a cylindrical fuse adapted to be inserted axially into said annular contacts to connect the same, said fuse having a portion normally lying in line with said apertures and adapted to be removed when the fuse is blown so4 as to give a clear view for the transmission of light through said apertures.

31. lnl combination a cylindric:1 sleeve member having stationary contacts cured therein, a cylindrical fuse member having terminals adapted to engage said stationary contacts, resistance means connected to one of said terminals, said resistance means being adapted to engage one of said statiow ary contacts and to be placed in circuit in series with said fuse member upon moving said fuse out of said sleeve member to cause the circuit to be broken at said resistance llllllls.

. In witness whereof, I hereunto subscribe inv name this 13th day of October, A. D.

NICHOLAS J. CONRAD.

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