US1612070A - Thermostatic plural-lamp pull socket - Google Patents

Description

Dec. 28 1926. 1,612,070

' R. D; sMxTH THERMOSTATIC PLURAL LAMP PULL SOCKET Original Filed Nov. 8, 1920 Patented Dec. 28, 1926.

UNITED STA'l TION Uli MASSACI-ICETTS.

SEJGNOR, BY MESNE ASSIGNMENTS, QGSTON, MASSACHUSETTS, A CORPORA- THERIfIOSTATIC LURAL-LATP LVJLL SGCKET.

Application led November 8, 1920, rial No. 4225/50.

rlhis invention relates to improved socket switches, and preferably, though not exclusively, to pull-sockets, incorporating in novel and advantageous 'combination a. plurality of different and convenient licht-controlling functions, which, in preferred form, are selectively available by the user.

In general, the object oi the present invention is to i rovide a socket (and speciiically, though not exclusively, a pull-socket) having a greatly increased :tiel-d of usefulness in its control ot both the degree and periodicty oi illumination produced by incandescent lamps, through the above mentioned novelly conil'iined "features oi' switch iunctifm,such i'eatires in the present instance comprising pre'J` ,ably the ability, through consecutive lull or partial strokes on the single switch- N ieiartiiig` pull chain oi a pull-socket, selectively and respectively to switch into and out ot circuit a inain lamp ot desired candle power 'tor full illumination, or so to control a. lainp of less candle power, that may be mounted rigidly and laterally on the socket structure to serve as a pilot or night light (in absence ot illumination by the main incandescent lamp), and the ability, when through with the full light of said main lamp, to operate the switch in the usual inanner and to cause thereby delayed, thermostatically controlled, automatic extinguishinent oi" the main lamp an appreciable interval ot time after actuation of the pull chain, so that full illumination may be had for leaving the premises.

i speciiic object ot the present invention is to arranco the circuit connections that' the small wattage lamp of less candle power may be energized by 'connecting the saine to the supply circuit in series with the main lamp3 a condition under which the filament of the latter acts as a -faintly luminous resistance to cut down the voltage across the terminals oi 'the brightly luminous low watme lainp. The current pa sing through the letter is thus less than would be the case were the small lamp connected directly across the supply line, and accordingly the normal lite of the low wattage lamp is longer and it is possible to employ, as such lamp, a miniature bulb containing a shorter filament than would otherwise be the case, Tlus last-men- Rcnewed May 1S..

tioned feature oi electrical arrangement may obviously be embodied in a plural lamp socket irrespective ot the automatic thermostatic extinguishing device.

A further object is to provide a simple arrangement of switch-controlling mechanism which shall render the switch nianually and selectively operable to a inafimuin degree as to the sequence of operatic-.fe effects resulting trom successive single pulls upon the control chain, and specifically, but not necessarily, s that consecutive full pulls upon the switchoperating chain shall operate alternately to light and extinguish the main lamp in the usual manner, but so that either ot he herctofore described special light-controlliiug` switch functions are available at will through less than a tell or complete actuatingstroke upon the pull-chain,

Other objects reside in the retention, in my improved. pull-socket having;l these several functions, ot substantie ly all the important and advant 'cous tea-tures ot modern conventional de n and construction ot soclrct switches, so that new i arts employed for producing 'the new functions heretofore recited are readily adaptable for production through the usual processes ot lamp socket manufacture. Such :features include the method ot securing the stationary inclined contact plates to the insulating socket base; the provision of rugged and readily accessible bindingposts Jfor connection ci the lead wires, as is desirable and even` essent the coniniercially succes nl scelte structure; and the telescopic assemblage of the intorior switch struct-ure with the outer enclosing` supporting casing, tree of inl; rr ence with the laterally mounted pilot lamp or other new p rts.

For purposes ol" illustration only, the present improvement is disclosed as embodied in a ixture or permanent type et pull-socket as appears in the accompanying drawings in which:

Fig. l is a plan view or" mv improved pullsoclret with casing and upper insulfd-ing` cap omitted and certain parts shown in section for clearness, the position ot the switch being, that in which the main lamp alone is operatively supplied with current.

Fig. il is a View in front elevation, show- Ain L i l'illy improved is composed as usual of au insulatia; cap l and an iusiiating base ll held l1 screws to the elecilated bell-mouth bi'acket lg, and post biacles le l5, the

ioi'niei* oi' which cai'ies a small1 insulatc-zdV izeceptacle l@ for the iniiiatuie, electicicielly connected fihthe thieaded l vllt tot theniain lain 67- by ineens othe holding sciew 18 (Fig. l\.

The. central, ventical pivot stud 2O,y is adjustably seated in recesses tonne-fl iespectively and centrally in the insulating cap and base, and pivotal-y cai 'ies the usual oscillato-fy segment-sry Actuatoi 2l, the coiled ioi i'otatively teil after its .sti-olie, and the double-ended conductive i'otoi all oi these paits being` axially sf'dable upon the insulated piifot stud and piessed axially downwardly thereon against inclined detent steps 84C, 35, and 36 ioifined on the insulating base ll, by the axial tension iu said spring' 22 as in the con-unen forni oi' pull-socket switches Well known in the ait.. The present iinpioyement contemplates the accomplishment oi the cited objects principally thiough the ieaiifangen'ient o'i' stationai'y Contact plates carried on the inclined faces of said detentsteps, ovei which tension of spring the ciicuits.

A ready undei'standing oi the oi coitnclibest he had through conipai i" ual l cori-Moonding conv e ci 11. .t til@ is tnown to thos the circuit is contiollec oi' the. ifotoi u'ipei over diainetiically opposite and siinilaily inclined detent steps, such steps being geneally ot SOQ cii'culai ent-ent' and ioni number, a pair of opposite steps c'ai'fyu nascent-ect plates connected as, suitabe ci cui-t. terminals tot connecting; the, lamp to the supply circuit W c(indu@tivelyV bridged by, the.: totes s .elise in tlf switch constiuction just described, itis Well known that each of said incline steps terminates in an abrupt insulating shoulder ioiined on tae insulating` base, to prevent retrogiessive movement o1" the i'otoin arms between steps.

ln Figs. l and 3 of the drawing, ioui` such insulating step shoulders appear in equally spaced elation, these shoulders being` understood to occupy a position relative to the heretoioie described switch parts substantially the saine as in the siinple conventional niale-and-bi'eal type of pull-socket switch bei'ifoie mentioned. This 4construction gives iise to the usual operation, i. e,

that the actuator (which is normally positioned against stop 31 depending t'ioin btacltetland is tiee toiv limited swinging inoyenient letueen said stop and the duininy bracket 82), possesses an oscillatory tavei of slightlyniore than 90, the lattei` being substantialy the uniform spacing ol step shoulders 30, so` that the. actuator, at each tull stroke thelfeot, diives the foton 33 by ratchet engagement therewith so, that each oil the arms 25 is advanced completely ovei one detent step and its teininating step shouldei 30 With a quick snap action and onto the succeeding step such action taking place simultaneously y'ith both foto? aiins, But in the ptesent in'iproveinent, two et the above described ratchetsteps, (specifically those steps which, in the siinple malte-andbiealt type oi pul-socliet switch, are blank) aeA divided in halves, and two additional iusulating slioui eis 33, 33 ate foiiaed pioducing two in nned det :it steps 3e, and in place oi"4 each of the or'J ynal blank steps.

'ilhus thtsc in iny iinpioied socket one pas oi: cont caii'ying steps 36, 33 ot extent, angulaily sepaiated by two pair pail 55, ca-ifiying` auxiliary Contact pla es, i'oi gevel-nii.lo the pilot lamp 59.

The electrical connections oi" these ste icai'iii ai if i. feines ase effident iioin 3, it eing notetl that a si u gle supply cicuit Contact i0 occupies both steps 35 and 86 on one side oi the switch; that a single Contact plate ll occupies the opposite short step 35, and Lhat two separate contacts l2 and -l occupy the base and top espectivcly of the other dctentstep Gontacts i0 and e8 each terminate diaineti'ically opposite e ch othei and theii uppetinost poifti n, in the angulai1 tion shown in i" il, Wheie the end ol-A the Wiper anni is shown as haa-ag iotatively passed the 'iz oi' sunnnit oi this angular torina-tion., and positioned on the` sloping tei*- ininal of Contact 43 to be discharged theret'rcin bythe. exil tension in The datent col; hoiweieif, is piveted on the Stad e* llt! sit-ioned to engage With one of the two spurs 46 on the Wiper arms to prevent such discharge until the thermostat 50 (which carries an insulated heating resistance Winding 51 electrically connected to be energized only in the position the rotor as shown in Fig. el) is heated by the current passing through said Winding and lexes outwardly to retract the hook ellltroin the path ol` spur i6 and permit the Wiper arms '25 to be discharged simultaneously as described trom contacts 4:3 and Ll0 to break the circuit through the main lamp.

The electrical connections through the switch as diagrammatically indicated in Fi l are produced in the structure as follows.

The long contact plate el() is extended to be clamped beneath binding post bracket l5 in the usual and Well known manner, as shown in HF ig. nfhe short contact plate di is e1 ended and secured to the in base ll by a screw 60 and retaining Another conductive strip is also clamped beneath the head of screuv 50 and extends to electrical contact With a holding screw GS for the small threaded receptacle lll tor a miniature lainp 59. Said receptacle and screw, lioi'verer, are entirely insulated from the binding post bracket la-, is evident troni Fig. l, and a separate conducti e strip entends from the miniature lamp receptacle lli to electrical contact with a radially outward extension G6 ot' contact d2. Contact l2 has also an inward extension electrically connected to the Contact tongue (lf-t tor the main lain as usual. Both the strip 65 and extension 6G are clamped between tl e be e ll and the bellinouth bracket 13, the being completely insulated therefrom by fibre, mica, or other suitable material Also thus clamped in electrical contact with the extension 5G 01"" Contact d2, is one enf'L TO, oi a connection lead from the thermos sistance -Winding 5l, the other end ot v Winding has a connection lead il catene ng to beneath the head a scrouT T2, vwhich in a manner similar to screuv 80 iirinly holds contact ell to the insulating base.

My improved switch operates as follows:

ln l the rotor 23 is shown in a po.- tion bridging and electrically connecting contacts Ll() and d2. Current is thus supplied directly to the main lamp which is thus adapted for continuous burning at tull brilliancy.

lllhen desired to extinguish the main lamp, a stroke upon the pull-chain 75 will c ,se the actuator 2l to acvance the rotor from its position indicatec by broken lines (at the lett and allieve contacts srl-2 and 43) into its position as shown in full lines in F' ze, VWhere resistance is offered to the further travel of said rotor by engagement of hook With spur i6 formed on the rotor arm 25, such resistance being readily telt by the hand of the operator. It it be desired to cause delayed extinguishment, the chain is then released and the Wiper remains in arrest-ed position until released by the thermost-atie action as heretol'ore described. lr it be desired to eil'ect immediate eX iguishment Without delayed action, the strorze on the pull-chain is completed against the rcsistance of hook 44, which as shown in lliqj. l is bevelled in a manner to produce aA r"- tracting tendency oit the detent hook when the latter is subjected to a su'tiiciently strong 'thrustby the spur The light is nou' extinguished and the Wiper arms occupy a its position as indicated in broken lines in l? i il and at the right of contact i3 in fl.

he opera-tive effect of the next single tuation ot the pull chain 75 is also optional. i halt stroke on the chain sutlices to rotate the Wiper to a position for bridging contacts LO and 4l, in which position the auxiliary lamp 59 and main lamp 67 are connected in electrical series to the supply circuit ,-or a 'lull stroke on the chain advances the wiper to its operative position shown in F ig. l, Where the main lamp alone is energized and burns at full brilliancy.

lt is thus evident that consecutively lull strokes upon the chain Will operate merely to light and extinguish the main lamp in the usual manner, but that iit suitable partial strokes be given to the pull chain the operative edects of delaying the extinguishnient et the main lamp and of establishing the pilot lamp in circuit may be secured selec* tively at their respective places in the cycle of operative movements.

lt will be understood, however` that no restrictions are intended to be imposed upon my invention through illustration of this particular sequence of operation. The sequence with which these operations may be had is merely a matter of choice in predetermined arrangement; and it will be clear that the automatically delayed acting means may as readily be arranged to transfer current from the main to the pilot lamp, or vice versa, or even to extinguish the small lamp automatically as may be desired.

Particular attention is called to the slotted construction at G8 of the casing 76 whereby usual telescopic assemblage of Such casing With its contained switch structure may be had Without interference by the laterally protruding pilot lamp receptacle i6. An insulating sleeve 78 completely surrounds said receptacle.

A curved chain guard 77 is shown extentving from and secured to the bell-mouth bracket 13 and may be 'formed ot libre or other suitable material *for insulating the conductor strip 62 from accidental contact by the pull chain 75, or other moving parts.

The usual metallic casing cap 8O may be removably interlocled with the casing 'TG in any suitable way, it being noted', however, thati'n its entirety the advantageous switch arrangement which l have invented and herein'described is as readily capable ot embodiment in an adapter type of soclret, or a pendant pull siif'itch, ctc., as in the permanent or lixture type of lamp socket herein shown.

lt is also noted' that although` Fig 3 indicates what is termed a series connection oi the thermo resistance connection relative to the main lamp, that an arrangement ot connections could as wel-ly be utilaed whereby the thermostat'ic heating` resistance would be encrgizedqby being placed' shunt to the lamp.

The feature residing in the thermostatic control mechanism, per se, including menibers cl2, 43, afl, 415 and 50, is not claimed in this application, but is toe subject matter ol claims in my twocopen ing" applications, l @idioti tiled Novi 3i, i920, and

5, liled Nov. 3, i920'. Also re jin the operative arrange ment of contact steps 30, 33, Se, etc; relative to the rotor 23 andl in combination with the pilot lamp receptacle and its electrical connections, is not claimedin this application but is the suhicct matter ot claims in applicants co-pen ig applicationy Serial .i (il, iiled Got. 2?, lQlQ', as are also c", olf' construct-ion and mounting said allot lamp receptacle 16, per se.A

Many modifications the Xact embodiment oii my inven r.-

herein disclosed, may be readily made; and without intention, therefore, oit limi ,g the scope ol the invention to sucll exact embodiment, what l claim as new is:

l. is. soclet switch having tivo lamp re ceptacies arranged to'receive respectively a 'vcly righ and a relatively low wattage l3g-clectrically controlled means operative when energiaedto cause the automatic circuit disconnection ol ot said recep- 'iaclesg-and contained switch mechanism inclnding separate stationary contacts Jfor circuits operatively related respectively to each ol said receptacles and to said means, to gether with a single inanually-actuable circuitgoverning` element mounted for movement relative to, and cngaoement with, said contacts, whereby either or said receptacles or one ot said receptacles; said means he selectively connected? L v la' may to the supply circuit.

aryV contacts arranged tol be placed', respectively, in operative electrical'l series with cachot' said' receptacles at dil'llerent positions of said member, and an auxiliary stationa:y contact arranged co-operatively with the stationary contacts governing one ci said receptacles to connect saidl means and said last mentioned receptacles to the supply circuit at another position ot said member.

3". A socket switch having; two separate lamp receptacles adapted to receive respectively a relatively high anda relatively low wattage lamp;v electrically controlled means operative u-*henenergized to cause the automatic disconnection olf one of said recep tacles from the circuitggand contained switch embodying,` a singlencting movable member arranged to he manuallyactuated, stationaryv contacts arranged tol bev placed, respectively, in operative electrical'series with each o'i said receptacles to energize the saine at different positionsy of said member, nel auxiliary stationary contacts arranged to connect said means and one oitsaitL receptacles to the supplycircuit atanother posi'- tion of said mem-ber.

Ll. A pull-socket switch having two separate lamp receptacles adapted to receiveI respectively a relatively highr andi a relatively low wattage lamp; electrically operated means operative. when energized to cause thc automatic disconnection of one ot said receptacles from the supply circuit and a contained switch. mechanism. embodying. rotatable current-switching; contact-wiper arranged to be manually driven through successive stages of movement by pawl-andratchet engagement therewith ot a spring,` returned oscillatory actuzrtory;` stationary contacts arranged, to bev successively contacted by said contact-wiper and electrically connected respectively to each oft said receptacles, whereby the latter are energized at dilerent positions ot said member.; and an auxiliary stationary contact arranged cooperatively with one or"l the receptacle-connected stationary contacts toy connect said means and one receptacle to the supply circuit at another posi `on ot sait-l member; together with a single pull element for oscillating said actuator toestahlish the connection and disconnection oi said receptacles and said means respectively to the supplvV circuit.

5. fr pull-socket switch having mi'. andanauxil' try lamp receptacle; elect la operaole en rgiacd to cause the automat? i (3fsaid re eptacles J'fom a ned si" ch invii i e. emoodying a cu Mnntfswilchinfr rotor, arranged cooperatively with an oscillato actuator havlng paWl-ancl-ratchet engagement the with to be retatively advanced in 'hill stage-s movement by tell, strokes ci" said actuator;

stationary supply-circuit contacts positioned to be Wipingly traversed by said rotor.) connected to said receptacles respectiyely,x and so consecutively si are verset movement of sai:Y sing-lc pull Climent full or partial str lios eby said svitcli rotor ablislicd in eitlier ot y est 'rel [ferent positions by sintwo operatively o li mecliinism embodying;l lly-pivoted current switchng; two diametrically oppas ai o' armsa a concentrically se ment having` stop means acles iroiA the simply circuit; and a to limit tlie su thereof and having pawl and, l" en agement with said member, wli'i.eby successive oscillations oil said segg ment rotatively advance said plate in stages, and a coiled spring connected to said segment rotatively to return the same and ai;- ially to press said Wiper arms against stationary inclined detent steps circularly arranged in the path thereof and termina-ting in abrupt ins ating` shoulders for preventing retrogressiae movement et said arms be- .Ween steps; stationa 'y inclined contact 'i' ',1 .1 i J. i )lates positioned on sam inclined steps to ce ileetricrlly connected rn by sait d iametri cally to eneroize said 'n 1 opposite pain i 2 in ull lary stat' mi c arranffed co-operatively Wu the lirst said coi ct plates to con ect Said means and oi e et said recegtaoles to tlie supply circuit at another rotative boeit-,ion ot' sai d arms; o einer with a ,4. L fle null element :tor oscillating said seg;-

ro control tlie ndividual supply circuit 7 l and i of d receptacies .sur

liet switch having;- two scp- Qtacles; electrically ogerated when eue-regie@ to cause tlie aanmatic usoonneetion ot one of said receptacles from. the supply circuit;v tained switch mechanism embody/me; a t

a. k. l atable, centrally-pivoted current-switcliing3V member having two diametrically-opposite contact wiper arms, a concent ically piyoted seureit iaying stop means to limit cof and liaying wiwi-andi whereby il segment roeoes, and a spconnected to said segment roly o return the same and axially to said Wiper arms against stationary ine'detcnt steps terminating' in abrupt in- *tu sa c arms bet-Ween steps, a

iotatnn ol f mi. ,1 .1 steps Y. no tiiculaii y dis in the patli Carli of said arms an] Within a siii it e oit circ-1 Contact plates i n Steps to be ele rically-opposit tric-ally conne spectiyely, where in predetermined .1' d ent rotati've positions aid arms; and auxiliary stationary Contact plate arrange( cio-operatively with the irst said con;v plates to connect said means and one ot receptacles to tlie supply circuit at anotvposition of said n together 'with a gie pull elem ising itull or partial oscillations o said segiiiait, whereby a selectA Ve sequence of supply circuit connect of sind receptacles i o. said means respectively is had. i

8. i plural-lampgoverning socket switch struccuro incli ding, in combination; two lam@-receiyingl receptacles mounted on the switcli structure; a double-ended, currentswitching, conductive rotor; two spaced and stationary main contacts positioned to be conductively engaged and disengaged simultaneously by said rotor tor resgectiyely cornecting and disconnecting-gl one of said lamp receptacles md tle supply circuit; auxiliary stationarjY contacts positioned in the path oit said rotor and circull 'ly spaced intermediate said main statioriry contacts re spectiyely; and circuit connections wnereii' contact oit said rotor with said auzfrilie u, stationary contacts ener-rises both et saiil receptacles sci-ies.

9. In a plural-lamp socket sivitcli structure embodyingl a movable contact member and automatic actuating means therefor tending when manually energized to more Said member to a circuit-breaking position, in combination; receptacles :For receiving a plurality of lamps; supply circuit terminals 'for the connection of said structure to a supply circuit; a device norn'ially arranged to intercept circuit breaking` movement of said member and electrotliermally energizable for permittino` said movement after a Substantial period or" delay; stationary contacts positioned to be oonductively traversed lili) by said member for switching` the current; and circuit connections between said terminals, said receptacles, said device, and said contacts, so arranged that .contact of said memberl with diiierent stationary contacts respectively controls the supply oit current to said lamps individually and operatively controls the energization of said device.

10. In a current-supplied soclret switch structure having receptacles for a main and auxiliary lamp respectively, and embodyingv a manually operable switch with an electrically energizable automatic device normally operative to delay the cut-oil' by said switch of current to one ot said lamp receptacles, and manually actuable means to control the energization ot said device, in combination; a movable switch-contact member operably related to said device and to said means; plurality or stationary contacts positioned to be conductively traversed by said meinber for controlling a plurality of circuits; and electrical connections between the supply, said receptacles, said device, and stationary contacts comprising said circuits and so arranged that, in one position or said member, current is supplied to the auxiliary lamp, in another position oi said member currentis supplied to said main lamp, and in a different position of said member current is supplied to energize said device for eii'ecting delayed automatic movement ot said member to a circuit breaking position.

11. A socket switch and plural lamp arrangement having` a main high wattage lamp, and auxiliary low wattage lamp, and automatic electrically-operative means to cause the delayed cut-olf or current through the main lamp ,-together with a switch comprising stationary contacts governing three circuits respectively containing said lamps and said means; and a co-operative manually movable circuit controller arranged by a irst movement thereof to energize said low wattage lamp, by a second movement to energize said main lamp and by a third movement to energize said means together with said main lamp thereby to cause the delayed cut-out of said main'V lamp.

12. A pull-socket switch and plural-lamp arrangement having a main high wattage lamp, and automatic electrically controllable means to cause the delayed cut-od of current through the main lamp ,-together with a switch comprising` stationary contacts governing three circuits respectively containing said lamps and said means; and a co-operative rotatable circuit controller having a pawl-and-ratchet driving device therefor arranged by one stroke thereof to position said control-ler to energize said low wattage lamp, by a second or further stroke to position said controller to energize said main lamp, and by a subsequent stroke thereof to eneroize said means together with said main lamp, thereby to 'cause the delayed cut-out of the latter.

13. The combination witl receptacles 'for a plurality oi' lamps, one of high and the other ot relatively low wattage, of a circuit controlling member movable to light and extinguish said lamps, and means automatically to retard the extinguishment of the lamp oi high wattage i'or a substantial period oi vtime after the initiation or the lamp extinguishing movement.

y14. ln a lamp soclet switch, a pli? of lamp sockets, a circuit controlling ber movable separately to light or extinguish the lamp, and means automatically to retard the entinguisliment of one ot lamps after initiating' the movement oi said member.

15. The combination with a plura lamp sockets, or" switching vmeans :tor nately lighting and extinguishing the lamps thereof, and means automatically to retard the extinguishment of one ci said after said 'switching means has been g te a movement for the eatin-guishment oi s1 lamp.

16. The combination with receptacles tor a plurality of lamps, one et high and the other of relatively low wattage, of a switch therefor including a contact controlling member, a switch control member and a thermo-electrically controlled device for said switch to retard movement of the saine after the movement of said switch control member.

17. An electric switch having contacts for a plurality of lamps, contact controlling means tor effecting a lcircuit. change lirst in one and then in the other ot said lamps, means manually to initiatethe circuit changing action thereof, and a thermo-electric device with a circuit therefor, the latter being conditioned by the circuit controlling means when actuated to initiate a circuit change in 'one of said lamps to delay said circuit change until after the lapse ot a substantial period of time.

18. An electric switch having contacts for a plurality of lamps, a movable contact controller tor effecting a circuit change in one and then in the other ot said lamps, and means conditioned by the movement ot said contact controller to effect a circuit change in one ot said circuits for automatically delaying said circuit change.

19. An electric switch having contacts Jfor a plurality of lamps, contact controlling means for edecting a circuit change lirst in one and then in the other of said lamps, and a delayed action control conditioned by the movement of said contact controlling means to effect a given circuit change automatically to delay said circuit change.

20. The combination with receptacles for lill) lill? a plurality of lamps, of an elect-ric switch having` an actuator, and means alternately to light said lamps through movement ot said actuator, said switch incorporating agencies automatically operative to retard extinguishment of one lamp tor a substantial-period of time following the movement ot said actuator designed to eiilect said extinguishment.

2l. The combination with receptacles for a plurality of lamps, oi" an electric switch having an actuator, and means alternately to light said lamps through movement of said actuator, said means including a contact controlling member having a lighting position for one lamp, a lighting position ior a second lamp and an intermediate position where both lamps are extinguished, said switch incorporating agencies automatically operative to retard extinguishment of one lamp for a substantial period ot time following the movement of said actuator designed to effect such extinguishment and prior to the movement ot said contact controlling member to said intermediate position.

22. The combination with receptacles for a plurality of lamps, oi a pull chain lamp socket switch having an oscillatory actuator, and a rotary contact controlling member, the latter movable alternately to light said lamps, with an intermediate position providing for extinguishment of both lamps, said switch incorporating agencies automatically operative to retard the movement of said contact controlling member to a position of lamp extinguishment tor a substantial period of time following the movement of said actuator designed to ellect such eX- tinguishment.

23. The combination with a plurality of lamps, oil circuits therefor operative to light or extinguish the same, switching means, controlling means for the switcl 'ng means, and means set into operation by the lamp extinguishing movement of said controlling means automatically to delay said lamp eX- tinguishment for a substantial interval.

Signed at Boston, in the county of Sufoll: and Commonwealth o' Massachusetts, this 5th day7 of November, 1920.

RAYMOND D. SMITH.

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