USRE14493E - Ments - Google Patents

Description

H. W. CHENEY SWITCH.

APPLICATION FILED FEB. 19 x917 Reissned July 16, 1918. 14,493.

3 SHEETSSHEET 1.

v awe/MW fZ/fl @949 H. w. CHENEY.-

SWITCH.

APPLICATION FILED FEB. 19. 1917.

Reissued July 16, 1918. 1 4,493.

,3 SHEETS-*SHEET 2.

' H. W. CHENEY.

SWITCH. APPLICATION FILED FEB. 19. 1917.

Reissued July 16, 1918; 14,493.

3 SHEETSSHEET 3.

UNITED STATES PATENT ()FFICE.'-

HERBERT W. CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO ALLIS-CHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

SWITCH.

Specification of Reissued Letters Patent. Reisgued July 16, 1918.

Original No. 1,177,016, dated March 28, 1916, Serial No. 529,066, filed November 20, 1909. Application for reissue filed February 19, 1917.

To all whom/1ft may concern:

Be it known that I, Hniuinn'r \V. uENnY, a cilizenot' the United States, residing at Milwaukee, in the county of lllilwaukce' and State of \Visconsin, have invented certain new and useful Tmprovements in Switches, of which the following a tail, clear. and exact specifi ration.

This invention relates to iml'n'ovemcnts in switches and particularly in oil switches.

One of the main objec s of my invention is the provision of a switch which may be employed with safety in buildings such as textile works coi'itaining highly intlannna ble uniterial. without any danger ofdho material being ignited either by arcing at the contact. terminals when the switch opened ()1. closed or by the blowing ot fuses.

A further objectis the provision oi an oil switch so constructed that the entire switch mechanism may be readily removed from the oil tank or inclosure tor the, purpose of inspection, cleaning. repairing. etc, with out any danger oi the operator or person handling the switch heii'ig injured by live parts.

A further object is the provision of an oil switch including an inclosuro having a. cover which on being removed so as to expose the contact mechanism in the, interior of the inelosure disctmnerts lhe contact Jncchauisi'n from the line or supply conductors. and which can be removed or again placed back on the main or bodv portion ot' the inclosure olii when tin. itch is open.

in carrying out one part o my invention I provide a switch ha ring a novel form of quick n|akc-andbreak operating mechanism by which the switch is hoth opened action.

In the provisioi'i and closed with a snap Invention further resid ot' fuses in the .iini'losurc o; and preferably in the cover. the ins wing removable with the cover and brin adapted to be connected to or disconiuwiin'l li-i'ini the line terminals and the contact terminals or mechanism. when the cover is place. in posilion or removed.

l n carrying outfanother part of my invention, l proviile switch mechanism in the form of a self-contained unit which is so constructed and supported in the melosure that it can be removed as a whole after the Serial No. 150,284.

and I mount in said upper portion fixed contact members adapted to be connected to the line conductors and detach-ably engageable by portions conducti\-'ely connected to the fixed contacts of the movable self-contained switch unit.

As another important teature of my invention I provide interlocking partsonthe cover and operating im-ehanisni of the switch, these parts preventing removal and restoration of the cover except when the switch is in open position. Thus by providing a construction wherein the cover is re movable only when the switch open and having means for onnecting the line terminals from the ch when the cover is removed, there is practically no danger of a short circuit occurring or of the operator being injured when the parts on the interior oi the inclosure art EXQOFfli.

My invention also re. les in certain other novel 'l'eatures of construction and arrange ments oi parts which will be described in the specification and set forth in the ap pended claims.

Reference is had. to the aceonipanving shci-ts of drawings wherein Figure l is a vertical sectional view along the irregular line i l-1 of Fig. 2 looking in the direction indicated by the arrows through a switch constructed in accordance witl; the. preferred form of my invention. Fig. 2 is a. vertical sectional view of the. same substantially along the irregular line 22 oi Fig. 1 looking in the direction indicated by the, arrows, the movable parts of the operating mechanism being shown in elevation and other parts being omitted for the sake of elearness. Fig. 3 is a top plan view of the switch with the cover removed and with portions broken away for the sake of elearness. Fig. 4 is a sectional'view 01 if the shaft is rocked in' the opposite direc tion the movable contacts will. be raised and the switch will be opened.

At the outer or free end of the shaft is an operating handle 34. -The shaft is not rocked directly by the handle but I rave provided a simple but effective form of q ck make-ambbreak operating mechanism "which will ausc the shaft and the movable Contact mechanism to be shifted with a snap 1925 1011, and this operating mechanism will now be explained. The handle Si is loosely mounted on the shaft 34 so that. it. may move relatively thereto, and con. by inter locking portions to member 40 a loosely mounted on the shaft but movable with the handle, this member l0 being provided on its inner side with. an inwlardly extending projection or tong all. Secured. to the sit-aft between the heal-in and the memberdt) and spaced a short distance from the latter a member 1 win it provided with a linger 43 projecting toward the member 40 and on. opposite sides of the linger 43 with a pair of notches is and -14 shown by dotted lines in L Surrounding the shaft and located between the members 40 and i2 is a coil spring; 4.5, the ends of which are bent dmvnwardly and on opposite sides of the tongue 41 and pin +3; in other words the tongue 11 and pin are located between. t free ends of the spring. Cooperating Wh'll this member i? and pivotally mounted on the side bar 18 of the supporting frame are two pawls or latf 4G and it) having nose portions adapted to engage respectively in the notches it and and having at the lower portions lateral. or outwardly projectpear presently, prevents the ner-at" sl.

bein moved to the left or H clockv e. n b I a m -'l .i.'ect|on, when the parts ll iie'a'ed as in l'ig. 4, until after it has .04 the notch. 44". The opera ion of this par of the mechanism will now be explained. If the handle moved in a cloc r direction, as Viewed in Fig. l, the end. of the spripg vhich engages the left of the. to gne 1? as viewed in Fig. 4:, will h moved clockwise direc ion, while tl the spring, because of it'" the finger 43 of member L ary, this member i3 also hen y because of the cngagenic. 4bin the notch 44. Erie stored in the spring by tb' handle and after the lat" predetermined distance =n shifted from .ing tongre -21 strikes the pin 47 of pawl 46 and shifts the latter from the notch 4-H after which the spring 4-5 in which energy was stored by the nmvenient of the handle turns the member 4-2 and the operating shaft Ellwith a snap action in the same direction that the handle wasmoved. This movement of the operating shaft causes the switch to he closed with a snap action. In asimilar manner if the handle moved in a counterclockwise direction, energy will first be stored in the spring and after a predetermined movement of the handle, pawl Ml, which was shifted into engagement with the notch 4rd: during the previous movement of. the member 42, is released from the notch flby the engagement of the tongue 41 with 'tl outwardly projecting pin 47 of the pawl, with the result that the operating shaft will be rocked by the spring JJ with a quick niovelnent and the switch will be opened with a snap action. This opening and closing of the switch with a snap action reduces arcing to a minimum and renders the use of the switch comparatiwly safe even in buildings having inflammable material.

To limit the volume of current passing through the switch and to' avoid the necessity for fuses arranged in the open exterior to the switch, I provide fuses on the interior of the inclosure and thei arraugel'neut and n'njn'iner of connection will now be explained. These fuses, one of which is provided for each conductor of the system, are shown at 49 4.9 and 49 and, as will be seen, are anged in the cover 11 of the 'inclosure and are adapted to be removed with the cover and. to be disconnected from the switch and contact terminals when the cover is removed. As will be seen from Figs. 1 and of the drawings, the fuses are clamped tween insulating blocks 50 and 50 which are secured to plates of fastened by screws to the underside of the cover 11. The. fuses are adapted to be connected to the line terminals and to the switch or contact terminals respectively when the cover is placed in position, and to be disconnected from the line and switch tern'iinals when the cover is removed, by twosets of spring jaws 53S and :i-il. The jaws 3 are secured at their bases by screws 55 to a woodcnor other insulating cross bar at) which extends betwcenthe side bars 18 and 18* of the supporting frame 17 and is secured to such side bars by screws 57. The spring jaws 5% are I at their bases by rews to a other insulating cross bar 59 also ending between the side bars 18 and 1E1" of the supportin frame 17, this bar 59 being' secured to the side bars by screws 60. i To the lower ends of the screws which secure the jaws 53 to the supporting bar and are electrically connected to these jaws 53, are secured metal. blocks (31 which engage spring jnws (3E2 oi. Il'iQtli iiii'ioh's ii?) whii'rh urn noun-0L1 by bolts (H. "o n. \voi'niniji 01' othm' insulating supporting inl'r (if: whit-i1 H nts npon. Hifiii'ilibiflnhouhiijn's Forum] by tho vxtonnion 155 0:! tho :h'nmo (H inciosm'o. Tho hoits (3i: foi'm tui'ininni i)()iliH to which aim snout-mi the 'Ul'll'lilllir-A of tho line contincrtrn'n which carry tho inn-rent heti'i'ohn tho shin-0n oil i'nirmnt and. tho switvh, or the loathing;- in. (EUHdIHJi'OIY-i an (iisl'inguisimii from tho cmniuotoi's whioh curry tho mlmunt iw'twomi the HA'iLCi) nini tho oiuotro-renn n.ii'o (iovioo oi iiovims. Thoso (ZUHLiLIfit-(Mfi Wi'hiiil :iio shown not (iii, are incmg 'ht into tho .ii'n'iiosnro thirtnigh tho .Oponinga .16 in the hiiif'tom oii xtmision 15.

'Tho iowmrends of bolts 58 \vliiuh SUGUL'G the opting jaws to tho 'insnintingg support 59 and amoiwrti-imiiy inn'nioototi to tho inns iii-o common-2d at their W )Wcn' ands tr toi'ini .nni uonihiotors 557* which, 1155 .Aimi hmin'o nzio chin: Nd and um oh iillfittlliij oonn to tho stationary cinatntt fa": n'n A nio 0d upon the mim ioitiiig rod 523. Thotm' minni (JUHdHUi'OlS 557, which are minlncotmi to tho coi'itnct frames 24 :inonntoti upon the supporting;- rod 23, ion oonn :tucl nt ililiil' upper ei'nis to blocks (3"? n'iioh summed. by screws 68 to tho uiniiizrsgnio of the innuiating supporting bin: 59, nnti. those bloom 6'? engage spring java (39 of metal blocks which. are socinod by toi'miimi SCLQWS 70 to a Wooden or other insuhitii ig supporting but 7]. renting upon shoulder: formed by tho o'xtt ion '15 'lhono toi- .i. screw iii. are adapted to he flififiilliflttiiiv uonn not nrntoiy to the torniiinils iQEtCilIlg-OIH? continutoii's 72, the oxpr soion. hindingmnt being used to distinguish from the line conductors 01' tho ooncinotorn which. carry the current to loiiuiiing-in omninotors above '1. scribed. .ns it will be soon that when the cover is in iiiaoo and the fUHUH ongiigro and are 0 tally con ni-ioioti to tho jnwn 51' and 54-, CLll'l. nt pn i H from the noinincrtors G6 to the terminal] 5 rows (5%, to the spring jinn: (32, to the 1)]0..,\:5 61 and 5:3, to the, spring jaws i rough tin. fuses to tho jaws. 54, thence by nci'i. 58 to the oonchwtors 525 thence through the botipoifnting sta tionzu'y and movable (militants nn'li that tho switch 153 closed.) to the in duotorn 27, illlti thenco to tho hiohn (ii spring: jaws ($9, and screws to the lending-out con duotors It will be Seen that if the cover is removed the contact mmhnnism oi the switch is disconnected from line or current supply-- ing uontiimtoi'n 36. In ()1'(i(.'t' thnt tho (liontnot mechanism [any not ho imposed by the l'en'iovnl of tho co'vor when the switoh is closed, I have provided n'mnnn Whioh no Vent the mn'iiiivni of the cover unless the switch is open, and this Wiii now he onplnined. By referring particularly to Fig.

1 it Wiii ho noon that the coveris provided with :1 down ii'ciiy' extinitiingingorprojeo tion 73 which is provided with a. hit .ni 1'0 PPSH or notvh 7i Tho shaft in 'prtiviiimfi inst below this Jroeotion T3 with a, iochin 70 ll'liltiiitil. '75 :it tho nppm' end of which a fin: inter: pi'o ii. .oti(m 76 Width, whom tho nivituh in iihjinoii, on'hns tho mavens or notch it so that the i'iHEHiiM'X'r-i T3 and iniJOl'iO'SiC. "i ihon tho am .1 0nd 713 oif tho U'HliliiiOl, 7h i 0! out 0" tho notoh "74k swung; to one swi-ption ihnt tho Oiiiil! switch o niuoi'inninin, ii Hiding tho ioijiiiiii'rt i'iisn'i anti in waiting inn-ninini n is n noi'itniniiti unit Wi'iioi'tu n he removed an at who] oin the hull: Wit out tiii-iiiliibiltg or inti'n'ieiiii gf "with tho UBPZI'lliHI-ifi of tho con-. duotoi'isi i'viiioh tini swi" i 11 order that tho switch may .iiiiitorii front. ti? inoionni'o when iio bail on. hantile 77 pminfinii, th i ilmil'lg' 'oonno :ted to the iii 34 shown oionriy in Fig. 8. By inoniiztn'ig' tho fiM-(Ii torinlrnii contact hiooiiisc or moinhn ii #30, TU nnni (5'2, ('33 and tho StilIJ KQOTFiJS th for in the upper portion of the mining wnn: mint tho out a iii-(11y matting portion 15, in iluoti'v'o parts mid. their snipports, which necessarily up conni ornijiie spoon, niro coiir-iitiomi'iiy JtiJOWiB the active, circuit-1111' tuning fixed nnd .n'iovaijiiiiacontacts of the in inovnhio switch unit, when theta contacts ni'oin operative position Within the onsii'ig Whore tiniy EL'ZL'EE mirn'inily imn'lel'nod in oil. The oii-contninin portion of the inning miity he of niiniinnm. and the general construction "i.

ght of mitten. and n. injinii'mnn quantity oi oil for prowl-1y ii'nnni i" 'ngg the cironit-1-nptni'ing SW1 Whiio n linhiining' nii tilt [in nting fontn .es of this tmiji swi...iniit mnnivnhie ii'on'i and replacenhhi in no oii-oontnining mining mini is connottoci to tho .iino tei'i'ninni ntnuts whon in ()EMEPRLHVO 1 ition in tho mining. Thus it will in. Uiili'lii'iiti :ti'iti i-olinhie phnrud when necessary and easily inspected. 130

in (nit-2.11mi, the 75 mocha so zinri'y tho onrroi'it to and from 85 these con-- 95 in. provision for" n niiinimun'i 10-5 of switch whtmin ooi'nplote 11o ho quick innkehnnii,iii-oak unent of the fusos,

Furtli-flnore the switch is safe from the standpoint of injury. to the operator, for the reason that not only are the line conductors disconnected from the contact mechanism of the switch when the cover is removed, but it is impossible to remove or replace'thc cover unless the switch open. In this manncr the danger of the operator short circuitin any of the live parts or oil being injured 1s )ractically eliminated.

The fact that the entire switch mechanism can be removed as a unit without disturbing the conductor terminals is a valuable feature for the reason that the switch can be cleaned or repaired much more conveniently and with less danger to the operator than with the present construction of switches. This is true particularly inasmuch as the contact mechanism is by the removal of the cover disconnected from the line or current supplying conductors and is rendered dead before the switch unit is removed from the tank. By disposing the detachable connection between the contact members associated with the line terminals and the fixed contacts of the removable switch-unit, or, at least, the major portion of such contact members, in the upper portion of the inclosure, that is, the portion of greater horizontal cross-sectional area, the necessary oil-containing space for properly immersing the active, circuit-rupturing contacts and the amount of oil for the same, and the weight of material of the casing may be reduced to a minimum.

What I claim as new and desire to secure by Letters Patent t- 1. In combination, in a switch, movable and stationary cont-act members, an operating shaft for the movable contact members, said movable and stationary contact members being suspended from said shaft and bodily movable therewith, an operating han 'dle mounted on the shaft and movable relatively thereto, a spring having operative conncctions'with the shaft and handle, a pair of pawls each acting at times to temporarily hold the shaft against movement while the handle is being moved a predetermined amount and energy is being stored in the spring, and means movable with the handle for tripping said pawls so that the shaft will be turned and the switch will. be opened or closed with a snap action.

In combination, in a switch, movable and stationary contact members, an operating shaft for said movable contact members, an operating handle mounted on the shaft, a spring sin-rounding the shaft, a. member secured to theshaft and provided with a laterally projecting portion extending between the ends of the spring and having a. pair of notches, a member movable with the handle and having a laterally projecting portion also extending between the ends of the sprin pawls coinierating with the notched member, one of the pawis engaging one of the notches so as to hold the shaft against movementwhile the handle is moved a predetermined amount in one direction and energy stored in the spring, and the other pawl engag ng the other notch and holding the shaft against movement when the handle is moved in the opposite direction and energy is stored in the spring, and said member movable with lhc handle serving to trip the pawls so that the switch will be opened or closed with a snap action.

3. In a switch, the combination of an'inclosure adapted to contain insulating fluid, a supporting t 'ame removably mounted within said inclosure, cooperative movable and stationary contact members and oper ating mechanism therefor carried by said frame, said contact members being normally suspended in insulating fluid in said inclosurc, a I'Lll'lOVzlblQ cover for said inelosure, line terminals disposed within said inclosure and above the normal fluid-containing portion thereof, detachable connections between said line terminals and certain of said stationary contact members, and cooperative interlocking members associated with said cover and. said o 'ie'rating mechanism, said interlocking members preventing the removal of said' cover when the switch is closed, and said frame, contact members and operating mechanism therefor being removable from said inclosure as a unit when the cooperative contact members are in circuit open condition and the cover removed, and said detachable connections being broken on removal of said unit from said inclosure.

4. In a switch, the combination. of an inclosure adapted to contain insulating fluid, switch meclninism rcn'lovably supported in position in said inclosure and including cooperative relativcly movable contact members and operating mechanism thereon in the form of a self-contained unit, said contact members being normally suspended in the normal fluid containing portion of said inclosirc, line terminals within said in.- closure and above the normal fluidcontaining portion thereof, detachable connections between said line terminals and certain of said contact members, and means operative to insure that said unit is removable from said inclosure only when the coti 'icrative contact members are in circuit-open condilion. said detachable connections bein broken on. the removal of said unit from said inclosure.

5. In a switch, an inclosure having lateral extensions on two opposite sides, a removable switch unit comprising a supporting 'l'ralnc, movable and stationary contacts and operating mechanism, said extensions having secured thereto insulating supporting bars, a plurality of members supported by members engagingin said jaws whereby the i unit may be renamed without (:listurbing the terminals.

6. in a switch, thecoi'nbinat on of are ceptacle, a switch unit comp ising fixed and movable contacts and operating lllutlltk nism therefor, said switch unit being rev movably mounted in said recel'itacle, a cover for said receptacle removable therefrom u1 dependently of said switch unit, line teri minals mounted in fixed position relative to said rece iitacle, and detachable connections arranged in series-con1uz:ct(al groups betweei'i the several line tern'iinals and i.:orrcs mml-- inp; ones of said switch contacts, certain of said detachable connections being broken by removal of said cover from said receptacle and others of said detachable connec tions being, broloini by removal of said switch unit from said receptacle.

7. In a switch, a. receptachr, a removable cover therefor, a plurality ot relatively liXed contacts, a frame for supporting said lixcd contacts, a phn'ality of relatively n'un'able contacts, means for actuatingsaid movable ci' l'ltacts into and out of engagement with said fixed, ontacts, said means con'ipris-ing an operating shaft from which. said lixcd. contact supporting frame and said movable contacts are suspenthal, coraluctm." terminals supported on said frame and insulatml therefrom, and fuses mounted on said mvci." and adapted to cminect said termil'ials when the cover is in place on said receptacle and to disconntwt the same when said cover is open, said switch and actuating means,- and said conductor tern'iil'ials being; bodily renmvable fron'i said rece n'aele as a unit.

a In a switch, the combination of a receptacle having" a removable cover, a, frame mounted in saii'l receptacle and comprising two oppositely disposed member tired coir tacts sul'iporti l in (narrative position by said men rs, a removable contact member comprising a yoke and bridging coi'itacts mount ed thereon and adapted to engage siiid fixed contzwts, means for roci 'irocation said movable contact men'iber i-on'iprising a shaft to tatably namnted in said frame and a toggle coma-act ion between said yoke and said shaft, said shaft and said cover l lting provided with interengaging nieml'urrs vent the ren'ioval of said cover while said switch in closed position, and detacl'iably engaging contacts moui'ittal on said frame and said cover for causing the switch parts to become dead when the cover is removed, said frame with its fixed and movable contacts and operating mechanism therefor beadapted to preunit when said cover is open.

9. In a switch, the combination of a re ceptacle, a switch unit comprising relatively movable contacts and operating mechanism therefor, said switch unit being removably mounted in said receptacle, a cover for said receptacle ren'iowible therefrom independently of said switch unit, line terminals fixed in position relative to said receptacle, comluctor terminals supported by said switch unit, certain of said conductor terminals being associated with certain of said switch. contacts and others ofsaid conductor terminals being detaehably connected to certain of said line terminals, fuses mounted on said cover and serving when said cover is in position on said ably connect pairs of said conductor terminals, the (:letachable connection between said fuses and said pairs of conductor terminals being broken on nuoval of said cover from said receptacle, and, the detachable connections between said line terminals and said crmductor terminals being broken on the removal of said switch unit from said re ceptacle.

in said receptacle with said cimtacts occupying the normal. fluid-contaimnp, portion thereot, a cover tor said receptacle rei'novable therefrom indepcndenlily of'said switch unit, line terminals and detachable comiections between said line tern'iinals and certain ones of said contacts mounted in said riaielnacle above the normal fluid-containlug portion thereof, and means for insuring that the circuit through said contacts is broken prior to removal of said unit from said reeeptacle, said means con'iprising a detachable coi'mection in series with said contacts and broken by renmval of said cover from said receptacle, the detachable connecticms between said line terminals and said contacts being broken on removal of said unit from said receptacle.

11. In UOIIll'JlIltLtlOH, a receptacle adapted tocontain insulating fluid and having its lower portion of sn'aillcr horizontal rosssectional area than its upper portion, line terminal contacts in said receptacle, means for supporting said terminal contacts in operative position, switch mechanism comprising fixed and movable contacts and a sup port therefor ren'iovable from said receptacle as ing portions operatively "engageable by said movable contacts, and portions adapted to be conductively connected with said first portions and cngageable with said terminal receptacle to detach" a unit, said fixed contacts compris-' contacts and said supporting means for said terminal contacts and the major portion of the part of said terminal contacts engageable with portions of said fixed contacts be ing disposed -in the portion of said receptacle of greater cross-sectional area.

12. I11 combination, a receptacle having its lower portion of smaller horizontal crosssectional area than its upper port-ion, line terminals disposed in operative position in the portion of said receptacle of greater cross-sectional area, switch mechanism comprising fixed and movable contacts and a support therefor removable from said re-' .ceptacle as a. unit, said fixed contacts comprising portions engagcable by said movable contacts, and means operative to conduc tively connect said line terminals with the portions of said fixed contacts with. which said movable contacts are engageable when said switch mechanism is in operative position in said receptacle, the movable contacts and the portions of said fixed contacts engageable thereby being disposed in the portion of said receptacle of reduced crosssectional area when in operative position in said receptacle.

13. In combination, a receptacle adapted to contain insulating fluid and having its lower portion of reduced horizontal crosssectional area, line terminal contacts in said receptacle, means for supporting said terminal contacts, said supporting means being disposed in the portion of said receptacle of greater cross-sectional area, switch mech anism comprising fixed and movable contacts and operating mechanism therefor remo able from said receptacle as a unit, said fixed contacts COl'l'll'll'lSlIlg portions opcra tively cngageable with. said terminal contacts and portions cngageable by said movable contacts, said latter portions of the fixed contacts and said movable contacts be ing disposed in the portion of said receptacle of reduced cross-sectional areaand said portions of said fixed contacts engageable with said terminal. contacts being disposed in the portion of said receptacle of greater cross-sectional area when said switch mechamsm 1s in operative position 111 said receptacle.

14. In combination, a receptacle adapted to contain insulating fluid and having its lower portion of smaller horizontal crosssectional. area than its upper portion, line terminal contacts in said receptacle, means for supporting said terminal contacts, said supporting means being disposed in the por-- tion of said receptacle of greater cross-sectional area, switch mechanism comprising fixed and movable contacts and operating mechanism therefor removable from said receptacle as a unit, said fixed contacts com-- prising portions operatively engageable with said terminal contacts and portions engageablc by said movable contacts, said latter portions and said movable contacts being disposed in the portion of said reeep-.

tacle of smaller cross-sectional area when said switch mechanism is in operative position in said receptacle. i

In combination, in a switch, an inclosure having its upper portion of greater horizontal cross-sectional. area than its lower portion, switch'mechanism mounted in said inclosure and comprising relatively movable contacts and operating meehan'isintherefor removable from said inclosure as a. unit, and tern'iinal. contact members insulatedly mounted in operative position in the portion of said inelosure of greater crosssectional area, said contact members being adapted to be connected to line terminals and having a detachable connection with certairr nf the contacts of said switch mechanism which is broken by the removal of said switch mechanism from said receptacle.

16. In a, switch, an inclosing casing hav ing a lateral extension adjacent the upper edge thercofbterminal contact members and an insulating si pport therefor mounted on saidcxtension, and switch mechanism com prising relatively movable contacts and op erating mechanism therefor removable from said casing as a unit, said switch unit including conductive connections from cer tain of its contacts detachably connected to said terminal contact members when said switch unit is in. operative position. within said casing.

In testimony whereof, the signature 0 the inventor is ailixed hereto.

HERBERT w CJiEKEY.

Images