US1456285A - Thermostatic lamp dimming pull socket - Google Patents

Description

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May 22, 1923.

R. D. ESB/HTH THERMOSTATIC LAMP DIMMING PULL SOCKET Filed Nv, s,

E14/wm gum/165i@ 5mm 5 monivealth of' lilassachusett l Patented May 22, i923.

UNITED PATENT OFFCE.

Application ned November T0 all w71 om. t may concern Be it lrnown that l, ltnxonn D. Samir, a citizen of the TJnited States, residing at Milton, in the county ot Noi-toll; d Qomhave invented a nevv and useliul Thermostatic Lan'ip-liniming` Pull Socket, ot which the following' is specification.

This invention relates to improved sock- 10 ets and particularly pull sockets, incorpo ratingw in novel and advantageous combination a plurality et different and convenient light-controllinze,` functions that in ilne'-r-,rred form are selectively available by the userJ through actuation ot the usual pull chain.

ln general the object et the present invention is to provide a lamp-socket, (and. specifically though not exclusively, a 5 socket) having` a greatly increased. i'ield usefulness in its control ot both the 0c and periodicity of illumination prv'idt the usual incandescent lamp thi-ou. above mentioned novelly combined eatu' ot sivitch unctiom-such features in the strokes on the single sivitch-opeiatinrg` pull chain, selectively and respectively to switch into and out ot circuit the usual incandescent lamp of desired candle pow r for Sull illumination and to switch into and out of series with this lamp a resistance unit compactly arranged as part of the socket svvitch structure and for continuous duty when desiree, this unit operating to dim the lamp when switched into circuit therewith; and also the ability, when through With the lig-ht to operate the switch to cause thermostatically delayed, automatic e'rtinauish ment or" the lamp an appreciable interval ot time ai'ter actuation ot the pull el n, so that full illumination may be had tor leaving; the premises.

A. specific object @t the present invention is so t0 construct and locate the lamp-dim mingv resistance unit Within the socket switch structure that an outer telescopically enclosing casing may be employed usual and properly formed to support the interior socket-switch structure in the usual manner, i. e., by shoulder engagement with 'the bv tom insulating` switch base, such ca o' being?` 'further suitably formed to ready dissipation to the atmosphere ot he' per l Massif" ieee.

ASSGNOR TO TREMONT PRODUCTS o, A COPORAION OF IVIASSACHUSETTS.

VMNG PULL SOCKET.

Serial No. 421,55.

may not accumulate in the socket-switch structure to the impairment thereof, or of the lamp base.

A. further object is to provide a simple arrangement otl switch-controlling mechanism which shall render the su'itch selectively opcrable manually to a maximum degree, and specilically but not necessarily, so that coneecutive l'ull pulls upon the switcheoperating chain shall operate alternately to light and extinguish the lamp in the usual inanncr, but so that either ot the heretofore described special light-controlling` switch Yfunctions are available at Will through less than a tull actuating' stroke upon the pull chain.

@ther objects reside in the retention, in my improved pull-socket, of substantially all the important and advantageous lfeatures of modern conventional socket-switch n and construction, so that any new parts employed for producing` the new tune-tions are readily adaptable for etlicient production through the usual processes ot socket manufacture. Such features include the method of securing` the stationary inclined contact plates to the insulating socket base; the structural arrangement of the socket structure as a Whole, and the man ner oit incorporatin Q, therein the lamp-dimiun'ig resistance unit so that maximum etliciency and simplicity of assemblage together with ready accessibility for adjustment oit the main svvitch-operating spring .is had; and also include the structural means by Which proper circuit connections through the svfitch are securely made through the clamping' ot the several interior lead terminals to the insulating' socket base, such construction avoiding); all requirementtor soldered connections and ensuring` uniformity and permanency in the finished product.

For purposes of illustration only, .the present improvement is disclosed as embodied in an adapted type ot pull socket as appears in the accompanying drawings in ivhich- Figli. l is a plan view of my improved pull-s clret With casing" and upper insulatingr cap omitted and ce tain parts shown in section for clearness, the position oit the switch being' that in which the main lamp aio/e is operatively supplied with current.

2 is a vievv in front elevation, showllU ing the complete pull-socket switch, with the casing and certain other parte brelzen une to showv the inte 'ior parts.

Fig: 3 is a diag/rem or electrical connutions. The mechzniicul parts represei'itc l therein appearing` in merely arbitre positional relation.

Fig. Llis an enlarged View of the current i chine' parts, looking' in direction of Fig. l, and showing; the rotor flengnge the detent lio/oli.

s :r pin-tiel View' in e eration loolfs ine' the right 0f Fig. Q, n'itl away.

ln the drawings, e slug ieerieg in more than one y I 1 hr the ,fune reference num lMy improved soclfeIV cor es usuel` en insnl ,l i Y suluted hase ll. held hy screws to tricelly insulu te the supply leed lneclets 'l former ot which is in clectricui. conte. the threaded receptacle l? ior 'the :n1 67 through the holdingI sci-euv lf3 t The central verti el pivot stud udjustehly seated in recesses Y Formed respectively und centrally in the i isuluting cup and hase7 und piifotulljiY carries the usuel one tory segginentery uctuutor 2l, the coller; spring' F22 for rotutively returnirfi' the latter ritter its stroke, and the double-ended c ductiye rotor all olt these per axially slit ehle upon the insulated stud 2O and ipressed axially downnerlly detente i l thereon against inclined A on the insulating bese l hy the axial i i sion in said spring 22 es .in the common 'form et pull-socket switches Well known in the zirt. The present iriinoyeinenf; plates the accomplishment ot the cited ol jects principally through the reurrfi of stationery Contact plates ce. 'ricd on the inclined 'faces ot seid detei i which the rotor 95)-, Spring; Q9, to .ineke e! ,t

A reed;v nnderstuntline; ot t.; this renrrencjeznent oi'i Contact liest he had through coinpirison tlieren conter corresponding; Contact plates in t conventional type ot' mnle-undhr socketswitch. In the er type it is Well known to tl ose skilled I j, that the circuit is controlled throuoh the con over diametricully opposite und sir. i er l clined contact carrying; tlc-ent er steps being; generally oli' 900 cire 1 und tour in number7 and u pair ot A steps carrying' Contact ple-,tes connecter, suitable circuit terinii els Y or connecting` tlie tively bridged hy the rotor erns. rlso iii ne familiar switch construction just dei, it is well lrnoivn that eecli ol said nt steps terminates in abrupt insuinfg shoulder lorined on the lnsurutnie' buse, to prevent retrogressire nurfcment o the rotor erms Q5 between steps.

in rigs. l und i, or ic einem, ,om such iiiil:itiii;'j step should-ers Si@ uppeur 1n i i, i

equally spaced relation these shoulde' icing' understood to occupyv :i nos on rt we to vthe heretofore descrihed .f-irrltch perte sulstuntiilly the seme us in the simple convenionsLY ilu-ler, i ype ot pulluiocliel 'cli lietore mentioned. iis construction rise to Ythe usuel operutuniv` i. c.. that :acti rior (Yl'uch is normulli' po tioneil zig-'einst stop dep udine' tri' AAet l5 l siriuuuej more-nient und is free .tor linuty d the dunner stop e .t poss Y tlv more thun QO the hitter lu-Ltirrllj' the circuler o? step shoul- 30 so that l'ull t 'ir :it curl;

utc, which.

teni', stepsn (snecficully in t 1e simple ii socket suitcln ere hlunli) are. i in hulres., and two edditionfxl interiiuzhu'fje insulating' shoulders l-l1 35K :ire termed. thu

producing ined dcteiit st oi" @ech or" the seid orijrinfxl lzlfinl: c

rhus there ere in my iinprorcd ,an

iuot contact carie-ring steps fitr "li ci" 91?" t circulsnlj-* sepfiriited hf.' tiro i :1, ot os o l of which lutter pairs` minorislileul und the other wir s 04;. i 35. c additional contact ph The iftriczrl connecticvisl o'." cnrricc i Acli Aeil contact nl we wfrlirf 4troni it heine' 'ioeil thut supply circuit contact #lfl e 35` .sint lf3 on one side ci t. single conti ct plete fl-l short sten 3y, und that "he oppizisite two e contacts 42 end lll occupy o hase und lop rispecti'ely oi" the other detent step Contacts #l0 and "3 eli-ch terminate dir.- n'ietricelly opposite euch other und :rt uppermost portion` in the :innulur Atoruwtion shown in l. Where the end ot the wiper erm shfnn us hui-'ine rotutirely irsswl the upc): oi summit ot this :uipjulur torrent-ion. and is positioned on the slopinf' terminal of Contact to he dische therefrom lijf the @nel tension in sprin The (let/ent hool: however, ispivoted on the hase inouniY stud 4:5 und is nornrillr positionezl to intercept one ot the tn'o sp* Wiper ernis .Vhcn the end oiE either o1" thu-1e 'their scribes above.

ifisaes arms has reached the rotative position shown in Fig. thereby to prevent further rotative travel ot the arin relative to the Contact plate 43 which further travel is necessary for permitting its tension caused discharge r'oni the sloping' Contact teriiiinal as derlhe said deteiit hook is held in its interceptinpv position by insulated pinand-slot engagement therewith of the free end of a flexing', bi-inetallic thermostat 50, mounted at its opposite end on the bracket 13, so long as the former is normally cool, and until the thermostat 50 (which carries an insulated heating resistance winduro` 5l electricf hy eoinccted to be energized only in the position ot the rotor shown iu `lig. l) is heated by the current and i'leles outwardly to retract the hooiroin the path or suur il@ and j ieriiiits the wiper arins Q5? e :reed siiiiultaneoiu v desc l and l() to breah the circuit through the iiiain lanip.

ln t Y pre e l utilize is a resistance unit tor the lain).1 a fine resistance wire w a separate metallic hell 533 and therefrom by a hiyer 54'1- ot iniea. papermy refractory eeinent7 or other suitabl' material as desired. i siinilar oe auplied to eo layer 55 inay l ance wire 52 ant prot-ect the l L A it desired. ina mould a s efr-nient. The she the resistance wire is wenn( su rounds the usual lai ll 53 on which -i l @opta-cle? being' siiiiciently grentz n d eter7 however, to provide a generous air space between the shell and receptacle to aid in the dissipation oli heat, Th tacle l? and shell are both secure bottoni surface oit the lower insoluti* il by means or iiaiiges such as sho :i

in Fia'. il, this particular flange being' held by and iisulated from the screw o b acket l5.

rlhe electrical connections switch as' indicated di;V 2E are produced iii the flue end ot' the lamp-dini wire 59, has terminal ioil lead 4' to ard clamped beneatln e l G() which screw also holds the e 4l on detent step 3;.

eng'

ioil lead 59 elaniped ben bracket i3 in contact w terminal contact tongue il in electrical Contact with the ot contact 442 is one end 7l ot lead I`roin the thermostat resist 5l, the other end of which winding connection lead T0 extending` to leneath the head of a screw 72, that in a manner similar to screw G0 l'rinly holds conta :t 48 to the insulatina` base ll. und properly positioned a connection winding' on detent step 3G. Suitable insulation 73 insulutes the bell-iiioutli bracket 13 i'roin all nietallic lead conductors that are clamped between it and the base ll. llie long contact plate l() occupying detent steps 255 and 3G, is extended to be claniped beneath aud in electri 1al. contact with the supply lead bracket l5 in the usual and well l noi-.rn inanner as clearly shown in Fig.

My iiiiprored switch operates as follows:

ln Fig'. .l the rotor 23 is shown in a position bridging` and electri rally connectingcontacts fil) and '-l. Current is thus supplied directly to only the VLuinp which is thus c l tor continuous operations at V'ull `e lain)7 a 'l e--lwith rotor ariu such :telt by the hand oli be desired to cai'lse deit, the chain is then reremains in its arrested i ,y .sed by the tlierniostatic i Tt it is de- Lbed. ii

ef Jshuicnt :fiction as h i to produce a retrait-r .naf "J i( l eli when 't e latter 'fr n l ".v En. le +1 Y L is suon/el creat g Sri ons nust ,JV the spul 'ht is now and the iper arris occupy a ,1' La i i' oieaierli b; o `en lines in :A is

rllhe oA #rr tire effect etx the i tin tion t e pull chain [5 is also optional. il, hill` stro f on the chain sul'lices to rotate tl i: fp bridgiiie con acts l() e id il, in rf ich position the la p-d' iino, resistance and lauip 6,7 are conneeteil in iectrical seri-5s to the supply circuit which ises niaiii lamp to burn dinily;----or a l stroke ou the chain advances the wiper i `i 'ts operative position shown in lling. l` .rliere the main laiun alone is energized and ,liurus at lull brilli cy.

lti l' s thus evident that consecutively Vful l'es upon the chain will operate incre ight and ly the iiiain lauip in 'i suitable pan e i 2i )ull chain the opera tire eilects l l heint (t tu laiup si d ot dirnn ip may be secured ectiyely at their respecti re places ii the cycle of operative nioreinen lt will uncerstood, however, tha no restrictions are intiiided to be imposed upon niy invention through illustration oii ilii particular sequence ot' operation. The sel ouence with i hich these operations may be had` merely a matter of choice in predetermined arrangement; also, it will be apparent to those skilled in the art, that in adapting my herein disclosed invention to coiniiercial use, the precise a 'rz ngement disclosed may readily be varied so that delayed autonnitic actuation of the switch may be had to produce switch movement from any stage to any other str e,-and not only from ilnlly lighted to oxtinguishment, as I have specilically shown the chosen construction to be erranoed. ny such modification is a mere m er of choice in arrangement.

A. curved chair guard 'ii' shown exten ding 'from and secured to the bracket ti and naiv lie if. bre or other sui le ma tcrial tor ii .ila the live parts troni ental Contact by the pull chain T5. or

eier moving parts that must be insulated.

`loiiventional pi'o`.ision 'tor mounting my iniproved switch in an orcinnary soci-:et appears vin Athe npper threaded plug 7S and centre contact Til which are electrically connected respectively with bra :kets l-land l ln; screw SO and by the screw Si, re rj plate Si?, and screw 83 respectively, it being` noted, however, that in its entirety the advanta- `cous switch arrargement which l nave invented and herein described is as readily capable of embot nnent in a fixture or pern'ianent type et socket, or a pendant pull as in the adapter type of lamp i The iasme; T6, i iay be extended in bell torni to serve as shade holdswitch, etc.,

or as sl .oin in Fig'. r.lhe ii-ature residing' in the thermostatic coinrol mechanism 50, 45, tl, 43, 4t2, etc. pei

', is not claimed in this applicatioin but i D subyect matter of claims in my vtwo coimdiigl applications, Serial No. 421,556, id lloveinber 3, 192() and Serial No. V'l2-l.-

' ieveinber S, 1920. Neither Vis the siding in the arrangement ot conl, 34! etc. relative to the rotor in combination with the resiritaice 53, 5l, etc. claimed in this apl the subject matter et claims i Patent No. 'lJGSlL i rcs ling' in the consti' ictio: n.51' ot the resistance unit 5l, 5i?, se is not claimed in this The above,

he exact, as herein disclos and many other moditieations embodiment et my invention d, may be readily made and without intention, therefore, ot limiting the scope oi the invention to such exact embodin'rent, what l claim new is:

1. A pull socket switch structure embodying, in con'ibination, a lamp receptacle; means to dim the lamp; a controlling switch: and a device operativelftf related to said switch, electrically governed thereby,

and adapted when electrically energized to cause delayed circuita-breaking switch Inovement to extinguish the lamp; together with manual actiating means tor establishing selective operative positions ot said switch whereby the lamp may respectively be fully lighted1 dimmed, or auton'iatically extinguished a substantial period of time after manual actuation of said switch to energize said device.

2. A socket switch having three elements 'to be energized, and comprising in combination; a plug receptacle to receive an electrical device; a resistance; and means operative, when electri-.ally energized, to cause :'.utoiuatic controlling movement of a contained switch; and contained switch mechanism including differently positioned stationary contacts for a circuit to energize said plug receptacle and resistance in series, and tor a circuit to energize said means simultaneously with one of said last mentioned two circuits; together with a single, manually-actual'ile movable governing element whereby eitha' of said three circuits m y selectively he connected to the supply circuit.

3. ik seit-contained socket switch structure including a` current-governing switch and three translative devices to be governed thereby, comprising respectively a current tap receptacle, a resistanc and electricallyoperable automatic means for causing delayed circuit `governing actuation o't said switch; the said switch having a nio y'able current distribntm' and co-operative stationary contacts connected as terminals respectively for a circuit containing said receptacle alone, and for a circuit containing said receptacle and said means, whereby J"nrongh movements et said distrilnitor said rcuits may selectively be supplied with irrent.

a. A self-contained socket switch strnctnrc adapted tor connection to a supply circuit and having three electrical translativc devices to be supplied with currenty from said circuit comprising a tap receptacle; a resistaiice; and electricaltv-controlled means operative, when energized to cause the autoniatic disconnection ot said receptacle trom the supply circuit; together with a contained switch mechanism tor governing the supply oli current to said devices and embodying a movable, coinluctive distributor adapted to be manually actuated. and separate stationary contacts arranged to be conductively engaged respectively by said distributor in different positions of the latter and electrically connected when so engaged to energize either said receptacle alone, said receptacle and said resistance in series, or said receptacle together with saine means.

5. A pull socket switch structure includlll) ing)r a current governing switch and three translativc devices to be governed tl'iereby, comprising' respectively a current tap receptacle; a resistance; and electricalijf-operable means tor causin automatic circuit-governin e actuation ov a contained switch; the said switch incliulinaer a rotatcl current distributor, a spring returned l r driving' element having# pawl-and-ratc encrage- 1elv adhet ment with said distributor or rotativ vancingr the later in pron'rcssiv f-rtatcs ot movement, detent means arrriiignnr o restrict retrogressive movement ot said listrilnitor, d the path and stationary contacts arrany'ed ot said distributor and co- .r minals respectively 'for a circuit cont said receptacle alone, Yfor a circ i ing' said receptacle and said rei. tr e in series`r and for a circuit containi Lf said receptacle and said electrically operable means; together with a pull chain tor manually actuating@- said driving; ele*l ent., wherebj,v said distributor may beV selectively established in different positions for selectively energizing said circuits respectively.

6. .A gull socket switch structure including); a current-governing' switch and thre, electrical load devices to be governed thereby, comprising; respectively a current tap receptacle; a resistance; and electrically-operable means for causing` automatic circuit-n'overninn' actuation ot said switcln-the said switch including' a rotatable current distributor, a spring-returned oscillatory driving;` element having;` pawl-and-ratchet engagement "v 'th said distributor whereby successive 'lull strokes of said element advance said distributor in itull stages ot rotative moveme dctent means to restri yt retrogressive novements oic said distriluitor5 and sepai ate stationary contacts arranged in the path ot said distributor-and electrically connected as terminals res aectively tor a. circuit containing; said receptacle`r a circuit containing` said yreceptacle and said resistance in series, and tor a circuit containing said receptacle and said means; said stationary contacts tor a iVv spaced within a full stage or movement ot said distributor, whereby a single stroke of said element is operative selectively to control a plurality ot said circuits,

i. A self-contained socket switch structure including ay current-governiugr switch and the rotor pivot from said supply-connected contact the said separate contacts beineconnected as terminals respectively for a circuit containing said receptacle alone, for a circuit containing` said receptacle and said means, whereinv the supply ot current to said circuits may be selectively7 established through the conductive bridaine` by said rotor of said supply-connected contact and selected inembcrs of said separate contacts.

8. l pull socket switch structure adapted 'for supply circuit connection and including a lamp receptacle; a lamp dimming; resistance; electrically-operable means adapted automatically to cut out said receptacle from the supply circuit; and conta-ined switch mechanism embodying` arotatable current switchine` m i mber having' two diametrically opposite contact wiping' arms; a rotatively oscillatoi sprin ;-returncd7 pull-operated driving ment having,v stop means to limit the otative stroke thereof, and having pawl and latchet engagement with said member, where-bv successive 'lull strokes of said segment cause tull rotative advance movements ot' said member; circularly positioned incined deteut rteps arranged about said end ot said pivot in the rotative path ot said wiper arms and terminating` respectively in insu ating' shoulders for preventing;` retro- ;rcssive movement ot said arms between seps; sparate contact plates carried on the incline portions ot said detent steps to cooperate with said curreut-switching member and electrically connected as terminals .respectively tor one side ot the supply circuit, a load circuit containing? said receptacle ne, Ytor a load circuit containing said rcceptacle and said resistance in series7 and tor load circuit cont ininasaid receptacle and said elect- 'ically-olfierablc means, said contact plates beineY so consecutively spaced that more than one ot said load-circuit contact plates is traversed by a wiper arm during a lull advance movement ot said member, whereby partial and full strokes ot said-senment establish connection ot' respectively dit'- terent load circuits to the supply circuit.

9, lu a thermostatically-controlled, lampdimmingf socret switch structure, embodying` a movable switch contact member and means tensioning` the same tor current tively traversed by said member ,tor switching the current; and circuit connections between said lead terminals, said receptacle, said resistance,said device, and said contacts, so arranged that in different positions, said member is operative to establish the energization of said receptacle, said resistance and said device respectively in selective and different electrical relations,

l0. A currentsupplied socket switch structure embodying in combination; a receptacle for an incandescent lamp; a structure-contained resistance unit for dimming said lamp; a lamp-governing switch with an electrically energizable device normally operative to delay lamp-extinguishing, circuitbreaking action oit said switch; and common manual switch-operating means for tensioning said switch automatically to effect said circuit-breaking action, and for operatively energizing said device ;-the said switch including a manually actuable currentswitching member, and co-operative separate contacts arranged to be electrically connected in variable relation to the supply circuit in diiiierent positions of said member, together with circuit connections between said contacts and said receptacle, unit, and device respectively so arranged that in one position ot' said member said lamp alone is energized. in another position of said member said lamp and said unit are energized in series, and in a different position ot said member,

r said lamp and said device are together energized. whereby automatic delayed extinguishment of said lamp is effected.

11. A socket switch having a lamp; a resistance for dimming said lamp; and automaticelectrically-governable means to cause the delayed cut-oft` of current to said lamp g-together with a switch embodying separate contacts governing three circuits respectively containing said lamp, resistance and means, and a (3o-operative manually movable circuit controller arranged by a First movement thereof to energize said lamp in series with said resistance, by a second movement thereof to energize said lamp alone, and by a third movement thereofl to energize said means together with said lamp, thereby to cause the said delayed cut-olf of current to said lamp.

1Q. In a pull socket for an incandescent lamp; means to dim the lamp; a current-supplied switch including a current-distributing rotor and co-operative contacts arranged to govern the energization of said lamp and said means; a device electrically governed by said switch, operatively related thereto mechanically, and adapted when energized to cause delayed automatic lamp-extinguishing actuation of said switch; and circuit connections to said switch contacts` and to said receptacle` said means, and said device, respectively.l whereby said lat-ter three parts are energizable in variable combinations by said switch, together with a manually-actuable spring-returned` recii'irocative driving element arranged to rotate said rotor through a single and a double stage of movement respectively by partial and lull strokes thereof, the arrangement of said eo-operating contacts being such that successive full strokes oli said element position said rotor alternately to light and extinguish the lamp, and further so that partial strokes ot' said clement operate respectively to dim the lamp and to cause delayed automatic extinguishment thereof. i

13, An incandescent lamp socket? structure adapted for connection to a supply circuit and incorporating, in self-contained form,- a lamp receptacle; two separate resistance units; and a switch arranged to govern the connection to the supply circuit respectively ot said receptacle alone, and of said receptacle in series with either of said two resistance units,-one of said units being arranged solely to dim the lamp; together with means including the other of said units operative when energized to cause automatic current switching actuation of said switch.

14. A pull socket switch structure embodying, in combination; a lamp receptacle; means to dim the lamp; a controlling switch; a device operatively related to said switch, electrically governed thereby, and adapted when electrically energized to cause delayed automatic switch movement to vary the supply of current to the lamp; together with manual actuating means for establishing selective operative positions of said switch, whereby the lamp may respectively be lighter. dimmed or extinguished; said device being arranged to be rendered operative by movement of said manual actuating means subsequent to a movement thereotl that establishes the switch in one ot its said operative positions.

l5. In a pull-chain` lamp-socket switch adapted to be operated by successive actuations of a controlling pull chain and incorporating agencies operative to dim the.

lamp and also to delay lamp extinguishment, means whereby said pull chain may be actuated at will to light the lamp, to dim the same or to set in operation said delayed action extinguishment agencies.

1G. In a pull-chain, lamp-socket switch adapted to be operated by successive actuations of a controlling pull chain, and incorporating agencies to dim the lamp and also to delay circuit breaking movement of the switch, means whereby said pull chain may be actuated at will to light the lamp, to dim the same, or to establish the switch under the control of said delayed action agencies, or to move the switch directly to break the circuit without delay.

i?, ln a pull-chain, lamp socket switch,

the combination with pull chain control means of automatic mechanism to cause selt` delayed lamp eXt-inguishment, circuits operative respectively to produce relatively high or low candlepower illumination and means whereby said control means may be actuated to establish at will said circuits tor either relatively high or low illumination or to cause self delayed lamp extinguishment.

18. ln a pull-chain, lamp socket switch, the combination with pull chain control means of automatic mechanism to cause self delayed lamp extinguishment, circuits operative respectively to produce relatively high or low candle-power illumination and means whereby said control means may be actuated to establish at will said circuits for either relatively high or low illumination or to cause self delayed lamp extingushment, or to move the switch directly tor lamp extinguishment without delay.

19. In an electric light switch, the combina-tion with circuits operative to produce either relatively high or low candle-power illumination, of controlling means to establish or break said circuits at will and means also set into operation by said controllingmeans automatically to delay lamp eX- tinpguishment for a substantial interval.

20. ln an electric light switch, the combination with circuits operative to produce either relatively high or low candle-power illumination, of controlling means to estvblish or break said circuits at will and means also set into operation by said controlling' means automatically to dela),Y lamp extinguishment for a substantial interval, said controlling means being' also operable at will to cause lamp extinguishment directly without said interval ot delay.

Signed at Boston, in the county of Sur'- ollr and Commonwealth olf Massachusetts, this 25th. day of October, 1920.

RAYMOND D. SMITH.

lVit-nesses SILVIO AnroRoso, JOHN CROWLEY.

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