US970523A - Circuit-controlling device. - Google Patents

Description

J. K. LUX.

CIRCUIT CONTROLLING DEVICE.

APPLICATION FILED 21:11.12, 1907.

970,523. Patented sept. 2o, 1910.

j4 slums-sum 1.

l u QQ u Wittmann J. K. LUX.

GIRGUIT CONTROLLING DEVICE. APPLICATION FILED rms. 12, 1907.

J. K. 1LUX. CIRCUIT GONTBOLLING DEVICE. APPLICATION FILED TEBJZ, 1907. 970,523, Patented sept.2o,191o.

4 SHEETS-SHEET 3.

` J. K. LUX. CIRCUIT CONTROLLINQ DEVICE. APPLICATION FILED PEB. 12, 1907.

Patented Sept. 20, 1910.

NiTED STATES .PATENT OFFICE'.

JULI'US K. IIJUX, 0F WASHINGTON, DISTRICT 0F COLUMBIA.

cracUIr-coNTaoLLIN'e DEVICE.

Speoincation-of Letten Patent. `Patented Sept. 20,1910.' aiipucation mea February 1a, ist?. seria1-no.ais7,4.

To' all whom it mdy'ciicn':

Be it k'nown that I," Jmaus K. Lux, a citizen Iof the United States, residing at Washington, District of C'olu bia, have in-v vented-certam new and useful m rovements in Circuit-Controlling Devices, o which the v following is aI specification'.

This invention relatesl to circuit controlling devices, and objects of the invention are to provide'an improved means for mountin the ,movable contact of (rotary snap switches whereby.a lmore durable, inexpensive and slmpleconstructlon'is secured; to

' provide an, improved ,f means for connecting the datent-stop ca in -member of a rotary snap swltch' to its msu atin fbase, whereby the breaking or cracking o the latter, due

tol impact on said member, will be prevented;

to provide an improved means for mountin the contact portion of a switch termina whereby the contact portion will adjust itself to the contact which engages therewith; tolprovide :lL-rubbing contact surface which w1 practically eliminate all wear of the contact engaging therewith; to rovide an V e contact members to the terminal post, whereby said members will be pressed toward each other; to. 1provide an improved terminal post which W1 l secure proper alinement of the contacts;

" to provide an improved means for securing the spindle engaging nut in the insulating hand e; and to provide an improved indicating means, whereby a cheaper, simpler and more eifective construction 1s secured.

With these and other objects in view the invention consists of the parts and combinations of parts hereinafter described, illustrated inthe accompanying drawings and more particularly pomted out in the append- -ed clalms.

Referring tothe accompanying drawings which frm a part of this specification, Figure 1 is a top plan view of a rotary snap switch embodying the principles of mv invention; the handle and .cover being removed; "and showing the base partly broken away. Fi 2 is aside view of the device shown in in'."1, and showing the cover. the handle and indicating meansI in position, partly broken away and partly in section to moi-'e clearly show the construction. Fig. 3 is top, plan ,View of parts of the device, showirigftlie clover.' the i of the circuit, the luminous indication andle, the movable .v Iand fixedy means for indicatina` the condition (n) being ,exposed to view. Fig. 4 is the ,indicating characters stationary. Fig. 5 is'audetail `perspective view of the shutter 'shown inl F1 4. Fi 6 lis a sectional view "of the embo iment s own in Figs. 4 and 5. Fig. 7A is a detail perspective view of the 'washerunder the operating handle. Fi'g. 8 is a sectional view showing the 4means for securin the indicator guard to the cover of the evice. Fig. 9 is a top view of the movable contact carrier. Fig. 10 is a bottom' view ofthe insulation of the handle, showing how the handle is molded. Fig. 11 shows side and edge views -of the platethat is fitted in the insulation shown in Fig. 10. Fig. 12 is a` perspective view, of the plate carried by the upper end of the nut. Fig. 13 is a sectional view of the nut. Fi 14 1s a side .view of the handleA spring.` ig. 15 is' a perspective view of one of the datent operatin cams. Fi .H16 is a erspectlve v1ew of t e upper en of one of t e terminal posts. Fig. 17 is a perspective view of the contact fastenin means. Fig. 18 is a erspective View oI the detent-stop carryingmember. Fig. 1.9 is a sectional ViewL of one of the terminal posts. Figs. 20 and 21 are top views of two embodiments of my contact member. Figs. 22 and 2 3. show res ectively a top view and a side elevation o another embodiment of my stationa contact. Figs. 24 yand25 showV respective y a side elevation andv a top view of a knife switch employing my improved contact members; Fig. 26 1s a perspective view of a movable contact employmglmy contact members and F1 27 is a view of the preferred embodiment o my impioved contact member. embodied in a rotary snap-switch it is to be understood` that some of the improvements may be ada tedlfor other types of circuitcontrollingy evices.

Referring more partlcularly to the drawporcelam or other suitable insulatin material. y Journaled in theJ base, 'refera ly centrally thereof ,isa spindle which operetes the switchblad'e or movable contact G.

Mounting switch blader-,Turning about `termed a movable contact carrier H w 'ch portions. hese reinforcing portions are a top viewof anotherembodiment showing,

ings A A.indic'atesya base or support made of the spindle Grs as an'axyis is what ma'4 be,

is formed preferabl of sheet ,metal bent at, its ends uion itse to form reinforcing strengthened by tongues H2 struckv upI from the carrier adjacent the reinforcing por.

tions and at their ends engaging the latter l to. 'reventlateral displacement oftheinsuseries of superimposed thin mica disks heldagainst axial movementlinthe. pockets byf inwardly extending annular ins, which pro ject -between ,the disks. These insulators support posts 2, which, attheir lower ends l are reduced and extend centrally through the insulators, having their lower ends flatytened against. washers arranged at the bottom of the insulators, It will be apparent that these reduced ends not only serve for anchorin the blade posts but serve yto hold the disks tightly to the ns. Further itvwill be noted pthat insulators of but one size are required and minute fitting is dispensed with'. The posts preferabl have sliding interlocking connection wit the switch blade G. For this purpose each post is provided with a reduced upper end having a shoulder or head on one side thereof so as to provide a seat for the switch blade on one. side of the post, the seats on the two posts being disposed inthe same direction. The swltch blade is provided with a central opening, to permit it to lit -ov'erthe spindle Gra and two longitudinal slots of a size to receive the headed extenslonsof the posts.

one of the posts and a flexible lig G* on the switch bla the lip Hs being age one end of one of the slots and the 11p G* bemg bent to engage the adjacent post.

- Means formo/va movable contact- As a preferred means or moving the lmovable contact there is secured to the spindle Gfs a collar F to which oneend of a coil sprin A or yielding actuating means J is anchore l The other end of the spring engages an up;

j Lu which extends through a' slot ward extension M upon a'detent or latch iThis latch isl arranged between /twocam membersor rin s L and L2 rigidly secured to the spindle s in any suitable manner. The detent carries a depending l l 4 in the blade ,carrier H, to form a connection be tween the blade and -a stop carrierlD, and

alternately en ages on and off stop v Ds and DT ont estop carrier D.

The' above.l described contact moving means is substantially that described in my Patent No. --835 ,074 dated the 6th dary of the fact that these lugs Alfter being tted over the headed extensions the switch blade is Iojection .Novemben 1906.. In thisv construction and others of a like character, the stop carrier.

D is rigidly secured to the base or support A y by depending lugs D2 which pro'et intol pockets in the base or su ort A'. wingto 70 2 do not properly fit the walls of the pockets the sudden jars to which they are subjected due to the de-- tent Llf engaging the stops l and D?, will in time cause the cracking or breaking of 75 the base A. To obviate this diiiiculty I form the lugs D so that they will be ielding, as for instance by splittmg'them ongitudinally. In addition to thisthese lugs or anchors. yield when the artsr are as- 8'0- sembled so that they bear equa y 'on thebase notwithstanding any unequalities or imperfections in the latter. Near their lower ends the lugs are provided on opposite sides with Y rounded noses D which `thus vform a .rock `35 ing engagement with thevwalls ofthe pocket.

' Stationary contacta-Arranged on the base A are opposite pairs of stationary con- 1 tacts C adapted; to bel connected by @the switch blade G. In a snap switch having-:a knife blade as shown in Fig. 2 it isvusual to. employ flat spring. contacts which are' arranged to clasp the blade* between them. When these fiat-rcontacts are"l fixed a` certain distance apart, if the blade-be slightly thinner than desired, onl thefor'ward ends of the contacts en age te blade, or, if the blade be sli`htl t icker tha desired, only the rear' en' s o the spring c ntacts engage the knife blade. In either case, the other 100 portions of the contacts will flare away from the knife blade. Thisaring of the spring contacts from the knife `blade also .o ccursf I even though the knife blade be ofthe proper, thickness, if the fixed or stationary contacts and movable contact are not held in. perfectalinement in everyv direction; and, as switchv v bases of porcelain always warp from baking, y .even though the metal parts bey mmutely exact, it has been found to be impracticable 110,

to carry -this precision into the assembling :of the metal parts-on the base, that is into' .way ofthe saidru bing surface so as Vto move as upon a central elastic support and 12.0

to deliver a-preferablyfequal stress' at op-` posite extremities of the rubblng contact `surface-that is the yielding contact member comprises contactin arms united by a exing connection', the' exingv axls of which lies 125 'in a plane which is transverse ,in reference s to the arms while the rubbing contact portion extends to both sides of lsuch plane. In one embodiment of my invention -as show n inl Figs. 2 and 2,7 the contact member C ls formed from sheet metal, the metal)V being split or cut to provide a tongue', yielding slde pieces, and a transverse securingy portion. The tongue and the side pieces are bent as shown 1n Figs. 2 and -27- to rovide a contact portion flexibly supporte at one side thereof. The rubbing contact surface is provided with a series of holes which may extend completely through the contact, portion or may extend partially therethrough, both of which are shown in Fig. 27. These holes contain graphite or other lubricant and serve to prevent the wear or cutting of the knife blade or other contact, by reason of the fact that any small particles will enter the holes and not travel back and 4 vided with ribsl or serrations.

forth over the rubbing contact surface. Of

' course. when the holes are exposed the para perfectly ytrue. inner rubbing surface. I\

have further ascertained that this irregular surface has an advantage in that it increases the surface of the contact.

Secwz'n'g Contact temeva- Two of the contact members C Fig. 27 are fitted around a terminal post C2 with their rubbing contact surfaces opposed, the securing portion of eachcontact member being introduced into a transverse groove g in the rear face of the terminal post C2. A wedge key C' (see Figs. 2 and 17)l hasits wedge ortion inserted between the securing portions of the two contact members, thus securing the contact members to the rear only of the terminalpost. This wedge key forms a means for forcing the forward ends of the contact member toward each other.

`key is provided withA upper and lower lshoulders which engage the ysecuring ortions of the two contact members and old said members in the lgroove in the rear of the post. The wedge key also carries a means for holding itself to the post, said means comprising two flexible arms lc which are arranged on op osite sides of the ost and the free ends o which are forced -mtc recesses g1 on the front face of the terminal post C2 (see Figs. 2, 16 and 17). This form of contact may be varied in many ways. In Figs. 22 and 23, the contact members C10 are each formed from a sheet or strip of metal which is cut to provide a securing portion, guiding portions, yielding portions looped to providel flexingsupports near one end, and a contact portion sup'- ported from said pivot portion at one edge.

'is a movable contact carrier carryin At its rear the switch is illustrated with my improved contacts. In this embodiment A indicates the base, B the contact members between which the knife blade is pivoted, and B the contact to which the knife blade. is adapted to be moved. lThe pocketed rubbing-contact surface has a special advantage in this embodiment, as it saves the knife blade adjacent to its pivot. y

The' contact may also be adapted for a movable contact as shown in Fig. 26. l t e contacts C which are arrangedV vertically and are provided with curved extensions to guide the movable contacts over the stationary contacts.

The embodiment of my contact member C shown in Fig. 20 is also formed, without bending, from sheet metal and'comprises a securing portion, two spring arms, and a vcontact portion connecting the spring arms, each arm having extending therefrom guiding lugs for the movable contact. In this embodiment the contact portion is secured at one end only and lies in the plane of the spring arms 1and the securing portion, being provided on its inner face with the lubricant pockets and on its outer face with the radiating ribs.

In Fig. 21 the contact member C12 is the same as that shown in Fig. 20 except that the contact portion is connected to the spring arms intermediate its ends, and that the guiding lugs extend from the outer end of the contact portion. It will be noted that by this arrangement the contact portion is fulcrumed intermediate of its ends.

Terminal posa-J provide va base plate 3 with a central struck-up hollow boss preferably of cylindrical formation (see Fig. 19) and in this boss I fit the reduced cylindrical end of the post. These parts are then secured together in any suitable manner, as for instance, by flaring the lower end of the post against the inner wall of the boss or by compressing the upper end of the boss into an annular groove in the post, or both of these.

The switch parts are inclosed by a metallic cover N lined in the usual manner with insulating material. The cover 1s held tightly to the base by an operating handle ,E which is secured to the .spindle G.

onstructz'on of operating handle- It is common to secure the operating handle to the spindle by a yielding means so that the handle will fit tightly against the cover and one of the features of this invention 1s the the yielding means inthe handle.

of. circuit controlling devices but this se-v Aand integral spring seats at the The handle is molded as shown in Fig. 10

with a central bore and two vertical grooves leading into the bore. While the handle is in a partially viscous State, a plate E3 is introduced into the two grooves. The side edges of this plate are provided with teeth or serrations which are disposed in such a direction that they will easily slide into the handle, but cannot be withdrawn without carrying pieces of the handle out with them when the handle is in a viscous state, or without breaking the handle when the handle is hardened. The plate E3 (see Fig. 11) is provided with a central spring opening ottom of the opening. In the opening with its lower end resting on the seats is positioned a helical spring E5 which bears at its upper end 'against a plate E6 (Fig. 12) carried bythe upper end of a nut'E, (Fig. 13) the plate.

being recessed at diametric points so as to be guided on the side walls of the spring opening in plate E3. The upper endv of the nut E4 (see Fig. 13) is provided with a pocket to receive a depending guide T integral with plate E",.while the lower end isv enlarged and is provided with grooves in which Work the walls of la throat leading from the bottom of the spring opening in the plate E3. The nut Ei* is adaptel to engage the threaded upper end of the spin#V dle G3. 4

When the parts of the handle have been assembled, as shown in Fig. 2, and the handle has been applied to the spindle' G3, an inclinedlu E2 on the plate E3 enters into a notch on t` e ring F before mentioned andpositively positions the handle, and its carried parts, relatively to the switch blade in a manner described in my patent before mentioned. l

lndca'tzng mana-It is a common practice to secure the movable member of an indicating means to the snap actuated portions curing means has added greatly to the cost of the device. As my operating handle is positively positioned relatively to the switch blade, I am enabled to .secure vthe movable indicating means directly to the handle. To accomplish this I provide, in one embodiment, an indicating disk G5 (see Fig. 3) with a central elongated opening corresponding in shape and size to a horizontal section 'through the operating handle E. The disk is then fitted over the handle and rests upon an annular flange which is on the bottom of the handle, this flange closing the opening in the cover through which the positioning means E2 projects as shown i'nFig. 2. To

hold the disk tothe handle, the disk is pro- -vided with two tongues which are cut from fthe metal of thedisk G at opposite' ends of Athe opening therein and are bent beneath tively thereto whilethe tonguesprevent up- I ward displacement of the disk. The indi# leating v characters 'Gr8 have usually been painted on the switch. These characters in time wear off or become coated with dirt thus destroying their indicating quality. Further they are not visible at ni ht or when the switch is installed in a dar place. To overcome these diiiiculties'I cut away the disk to form the characters and position beneath the cut away portion a sheet of mica treated on both faces with a luminous material.

It is common to provide the indicating disk with a guard which covers or hides from view all butthe word or character in- 4 dicating the condition of the circuit. This ard forms the stationary member of thel indicating means. These guards are so constructed that they throw a shadow over the indicating word or character. This dithculty I overcome by providing a guard N2 which has a width approximately equal to the height of the characters, and is supported over the characters by a peripheral flange which engages the periphery of the cover N. The guard is cut away to expose the characters that arey to indicate the osition of the switch. It will be noted t at' by. reason of the segmental .ring shape of the guard it will be spaced from the center of the top of the switch, thus admitting li ht from all`directions to the characters. T e guard is secured against accidental displacement by bosses -or projections on the cover engaging in openings or recesses the flange of the guard as shown 1ndetall Fig. 8. Y

To permit the indicator G to be removed 'without removing the guard, vI provide the disk will pass both ends of the guard, but

when theloperating handle is rotated inthe opposite d1rection to remove said handle, the inwardly l turned end 'of the guard will move into. theslot andthe diskY will ride i over the'V guard'and from beneath the same.

Thus it: will '-b'e seen that I` ,prox/ idea means i for removing the indicating disk without removingthe guard.

Azo

In Figs. 4, 5V and 6 I have shown an indic'ating means wherein the indicatingb characters are stationary, being carried y the cover N which forms the stationary member of the indicating means, the cover being .provided with an annular elevated portion 1n which the indicating characters are pierced. Beneath the pierced characters and between the cover and its insulating lining are arranged mica plates which are, as in the other embodiment, coated on both faces with a luminous material. The guard N2 is in the form of a ring having a depending flange which is itted to the periphery of the cover, the elevated charactercarrying portion of the cover being but slightly below the top of the ring so as not to be shaded by the guard. The movable member vofl the indicating means is in the form of a rotary shutter G70 which at its ends is bent beneath the guard N20. This shutter is provided at its center with a nonvu circular opening which fits a noncircular I boss on the to of a washer E, the washer being provide in its `periphery with pockets having recesses at their lower ends. Into these pockets are fitted tongues depending from the shutter, said ton ues having their extreme ends forced into t e recesses at the lower ends of ,the pockets to hold the shutter on the washer. The washer rests on ,the center of the cover and over the spindle opening in the latter, being thus surrounded bythe elevatedv character-Carr ing portion of the cover. To hold the was er and consequently the shutter to the cover so that they will not become separated, the washer 1s rovided with anl annular rib or fiange at lts bottom and over this fla-nge are bent gpsor tongues N1o struck up from the cover Surmounting the washer E*m is the handle E wlnch has the usual screw threaded connection Awith the s indle and which is y provided with a depen ing lu which enters anotch in the top of the was ier. It is a parentthat by simply removing the han e .rom its spindle the cover with its indicatlngmeans ma be removed, thus obviating the handling o a great number of parts when ms ecting the switch.

claim 1. In alcircuit controlling device, a support, cooperating contact elements carried thereby, -at least one of said elements comprising conducting arms, a rubbing contact portion, 4and a lexin connection between the said arms and rub ing portion, the fiex.- ing axis of which connection lies in a plane which is transverse with reference to the arms, the saidrubbing contact portion extending to both sides of the said plane.

2. In a. circuit controllin devlce, a support, coperatingcontact e ements carried thereby, at least one of said elements having a portion returned upon itself, and a lrubbing ortion extending in an opposite direction rom the said return ortion.

3. .In a circuit controlhng device, a sup-- port and an electrical contact carried thereby, a movable c ontact member cooperating ort and an electrical contact carried therey, a movable contact member cooperating with the first named contact, actuating means for the movable contact member in-4 cluding a movable part provided with a plurality of pockets and integral fins projecting into the pockets, laminated .insulators seatc in the pockets and held in lace by said fins, and connections between t e insulators and movable contact member and binding the lamina: of said insulators together.

5. In a circuit-controllingdevice, a support, a plurality of electrical contacts carried thereby, a movable contact'adapted to connect said electrical contacts, -means for operating the movable Contact, a detent for controlling said operating means, and a detent sto carrier for the detent, provided with yie ding anchoring means 6. In a circuit-controlling evice, a support, a plurality of electrical contacts carried thereby, a movable contact adapted to connect said electrical contacts, means for operating the movable contact, a detent for controlling said o ratin means, and a detent stop carrier or the etent, having lugs split longitudinally and connected to the support.

In a circuit-controlling devlce, a support, a plurality of electrical contacts carried thereby, a movable contact adapted to connect said electrical contacts, means for operating the movable contact, a detent for controlling said operating means, and a detent stop carrier or the detent having anchoring lu connected to the support and having rociisng bearing surfaces on at least one side. l 8. In a circuit-controlling device, a support, a plurality of electrical contacts carried thereby, a movable contact adapted to connect said electrical contacts, means for operating the movable contact, a detent for controllin said operating means, a detentstop for t e detent, and a yielding connection between the detent stop and the support.

9. In a circuit-controlling device, a supprising a terminal post, a members loosely fitted on t e post, and a air .of contact fastenin means including a wedge to spread and hol the inembers on the post.

10. In a circuit-controlling device, a support, a movable contact on the support, a

-prising a terminal post transverse groove, a pair o contact members terminal post, a pair of contact members loosely-mounted on the post, and a fastener including aV wedge arranged between and `spreadingthe ends of the members apart.

`11. In a circuit controlling device, a support, a movable contact, a terminal post, a pair of contact members mounted upon the post, and means for forcin the contact portions'of said lcontact mem ers toward each other. i

12. In a circuit-controlling device, a support, a movable contact on the support, a stationary contact also on the support, comprising a'teri'n'inal post, apair of contact members, a fastener including a wedge arranged between the ends of the members, and means carried by the fasteners for holding the wedge-to the post.

13. In a circuit controlling device, a support, a movable contact on the support, a `stationary. contact also on the support comprising a terminal post, a pair of contact members, and -a fastening device to hold them tothe post, provided with arms engagin the post.

14" n a, circuit-controlling device, a support, a movable contact on the support, a stationary contact also on the support comrovide with a having portions thereof seated in the groove, and means arran ed in the oove between the. contact `mem rs to ho d the contact members in the groove, and havin flexible arms arranged on opposite sides o the post and en aging -the front thereof.

15. na circuit-controllin device, a support, a contact carried there y a coperating movable contact, a s dle connected to the movable contact, a handle for operating the spindle comprising an insulatin portion, a spindle engaging member, an

a plate inthe insulating portion provided with a recess receiving the spindle engaging member, and havin Aa contracted throat closely tting the s ind e engaging member,

and a spring iii t e recess engaging said throat and urging the spindle engaging member into the handle said plate having slidiii interlocking connection with .the spin e.

16. In a circuit-controllin device, a support, a contact carried there y, a coperating movable contact, a spindle connected to the movable contact, a handle for operating the spindle comprising an insulating ortion, a spindle engaging member, an a.

plate in the insulatingl 'groes with a recess receiving t e spindle engaging member, and having a contracted throat closely adjacent the outer end of the spindle engaging member, apd means adjacent-the contracted throat and connected withy ythe spindle for engagin the' plateY and vpositioning the han contact.

17. In a circuit-controlling ydevice,'a support,.coperating contacts carried thereby, and circuit indicating means for the contacts comprising) a movable member andl a stationarv mem er, one of which members is provi ed with pierced indicating characters, and luminous means on the pierced number beneath said pierced characters for closing the saine.

.18. In a circuit controiling device, a lsupport, coperating contacts carried thereby, a handle moving with one of said contacts, andan indicating Vmeans for the contacts comprising a stationary member 'and a movable member, they latter being provided with a non-circular opening fitting upon the handle and with tongues bent into engagement with said handle. f

19. In a circuit-controlling device, a support, coperating contacts carried thereby, an operating spindlel for one of said contacts, an operating handle having a connection with said s indle said connection including means wliereby the handle may be removed therefrom when rotated in one direction, an indicating member moving with said handle, a guard for the indicating member, and means coacting .with the moving member to remove the latter member from beneath 'the guard when the operating handle is moved to remove the latter from.

the spindle.

20. Ina circuit-controlling device, a support, coperating contacts carried thereby, an indicating means lfor the. contacts -comprising a movable member and a ard, and

lere atively to the movable portion provided d means coacting with the movab e member to remove the latter member from beneath the guard when said movablemember is moved in one direction. i

21.' In a circuit-controlling device, a supa cover. for the contacts, an indicatin means .for the contacts comprising a movab e memmental guard having one end turned toward the disk and the other en d'turned away from thiewdsku l A 1-15 port, coperating contacts carried thereby,

. the said bearin 23. In a device of the character described, a support, coperating contact elements carried thereby, at least one of which elements includes a member projecting from the said .support and bearing a rubbing contact portion having a rubbing face and a reverse or rear surface, a yielding connection between the said rubbing contact portion and the said projectilw member which yielding connection is adjacent the said rubbing face and ex tends back of a plane in which the said reverse or rear surface resides, the said rubbing portion extending from the said yielding connection both toward and from the said projecting bearing member.

24. In a device of the character described, a support, ctiperating contact elements carried thereby, at least one of said elements comprising a bearing piece for a conducting arm, a conducting arlnwith an opening therein between the free end of the said arm and its said bearing piece, a rubbing contact portion connected to the said arm adjacent the free end thereof and adjacent the said opening, the said rubbing contact portion extending from its said connection at the free end of the arm toward piece and extending' also from the last said connection away from the said bearing piece. e

25. In a device of the character described,

a support, coperating contacts carried thereby, one of said contacts comprising an arm havin a return bend and a return part with a rubIiing contact element, a portion cut from the said arm bent away from the Same and beyond the said return bend and into alinement with the said rubbing contact element so as to co-act with the other said cooperative contact.

26. In a device of the character described, a support, coperating contact elements carried'thereby, at least one of said elements comprising a bearing piece for a yielding conducting arm, an integral rubbing contact portion yieldingly connected to the said arm which rubbing -portion has free ends projecting from the said yielding connection respectively toward and from the said bearing plece.

27.' In a device of the character described, a cover, exterior movable indicating means,

a guard over the said indicating means, and

means for disengaging the said indicatingi 'means from the said guard by a backwm` turning of one of the said members.`

In testimony whereof I aix my signature, in presense of two witnesses. i

J'ULIUS K. LUX. Witnesses:

WILLIAM KURTZ BRowNE, HERBERT L. FRANC.

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