US2521448A

US2521448A - Portable desk lamp

Info

Publication number: US2521448A
Application number: US121211A
Authority: US
Inventors: Laurence E Corcoran
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-10-13
Filing date: 1949-10-13
Publication date: 1950-09-05
Anticipated expiration: 1967-09-05

Description

,column is,.grasped asa hand grip.

' cient tirnefor 'the column V'to coolfto` Ya, point Aer I I .STATE-s PATENT-- i y k,Laurence E. Corcoran,'1B,1'1l."falo,y N. Y'. f I ,npplicanoncctober 13, 1949,seria1-3No.4121,211 a 3 Claims. (cl. 240g-'sri y v v. 1

invention relates to V*improvements in portable .deskor table ,lampsof the type which includesl a `pedestal comprising ,a base and an uprightfcolumn :for-med and -.proportioned :to ser-ve as a hand V-grip when the lamp is to lbe moved from-one .position to another,..a lower cup-like reflector vdirected upwardly,` ,enclosing 4the f vlamp bulb-and Ihavingfits:flower portion adjoining lthe column-and formeclfasgacap tokerrclose the-lamp sceketeand a cover which provides, lor. carries, .an A

upper reflector directed (downwardly, the cover being-supported :from theV lower .'renector,

In lamps .of'rthisgfype chef-base column and" cupy wfithftheupper freflector vv,are formed as separable"elements and @their assembly is .maim

tainedby za tubular threaded Ystem -vvhich pro* n jects through the ,pedestal andfis rconnected .to the damp. socket, :the stemserving as `a `conduit for the-fwi-resland'maintaining the assembly of the partspcooperating with the I.cup 4and the base Y g` as rclampin'g f-elementsfinr relation to the column lamps arel :adwantagecus 'zbecause 4they giveza concentrated-pool of --lig-ht'uponthe workv ing plane Afat-anangle such-faste minimize glare and -Aalso conceal-fthe source :of ,lightfirom the workerfat the desk` erta-lele` 7thense of such lamps *,it is `-irecmently. desirable that they be movedfrom one-position to another .on the -desk orltablefand itfisffor thefpurpose `of convenience in effecting isuch :movement :that the column .is formed land pnoportioned fto nserve :as a hand the :reflector becomes:-

heated ,layv :the rad-iaL tion V;f-ronf1-fthe lamp =bulb-and fits heat is tua-nsresult that after a few minuteseof use the column beoomes1=sorhot thaxtffit-isinotipractical to grasp it in order to move the lamp, wherefore the lamp is quite apt tjo'be dropped when the heated Therefore, in order conveniently to move the lamp it is 4In theaccoinpanying drawing:

Figure lis Lan elevation of ,alamp in accordance with the invention.

.Eignre'Z is a vertical vsectional viewy of the base, column, y.cup and lower reflector features of the lamp, the electric 'bulb ,being shown .in eleva-y tion. v

f l LFigure `3 is anjexpibrldlperspective View of e1fe mentsV employed in the ,heat inslation ,oi v the colnmn`from'the cup.v The 1known.elements.of theglamniin relationjto the ,fveatuwlfesjwhich constitutes theinvention, ,in-

clude fthefbase l, the tubolari column '2,f ythe lower upwardly' facing conical reector 13 Vand thetubular cup 4 preferably' inteera1 with the rellector and projecting 'axially from "its lower end, the

cupfll 'beingpreferably of.4 the same. vdiameter'.as the'column andbeing'provided with 'a'base 5 hav` ing a central opening to ,accommodate #the threaded tubular stem whichj'seryes as va conf duit for they .wires and by jwhichftheassembly Vol. `theenumerated parts ismaintainedgjfhe reflecting surface, in .accordance with known practice, may be. provided directlyon the reflector 3'jor`it may, asfQshowniand preferredbe provided by a separateicupshaped element l whichiis'ltte'd Agrip.'2.,flnvfever,as heretorfore constructed, .such

vlamps,@havehad la fseriousidisadvantage in that l necessary toswitch oil the lig'ht and allow suf@ at whiclrritvcan be convenientlyf'grasped. f d 1 Une-object of the `inventicfnfisto provide simple and' practical means of noveleharacterincluded usual ornamentaljiniial l2;

inthe assembly of the .pedestal @base and'fcolumn) i to another desk oritable;

within the reflector and has a'bottorn opening through which the Aneck of the `'lamp 3bulb may be inserted, 'the lamp Dulbprojecting from the `usual, socket c -fencibsedwithm the up 4. "The cup `4 'has'.at one side an opening .toaccornmoda'te thestemf 'ofthe nsnalfflamp'switch 9.1 K

'Ihe .lairlp,r lfiursi1-arit 'tof `known mechanical lde# sign, isfcoinpleted by a downwardly facing-cover 10 supported 'from the fre'lecto-r,v 3. The cover- 12B includes a downwardly l'facing lreflector 4feature and has Aits lower edge below the upper ledgefof the reflector f3, jthereby to conceal the source of light ffrorn the worker and to protect the worker from the 'glanej of the' direct 'rays of A"lighti Wlhile the cover lt) may be-nished to serve as a reflector "it is preferable ltl'iat the irei-lector `feature "be provid-ed by ,vangappropriately formed' reliectorv plate Il whclri:*is sufficiently shownby dotted lines -hiriilliguieIl. fThe cover carries `the The 'LC-Crerflnzaccordance with ,kmr/11' Pre?? tice, is snppo`rtedjr'onjl fthe'refle'ctor 3 by suitab'ly formedlupward'ly projecting arms I3, the

lower portions of which may b'e 'bolted or lotlnier'- y Wiseseure'd to'henlpper 'portion f the rededor 3 and'th'elippe'r portions of which directly supiport lthe y cover. In the construction shown wherein the cover l! is connected to a separate reflector plate .ll the upper portions of the armsV column 2 is closed at its upper end by a washer v A y I6 of inverted cup shape, that is to say, a washer which is provided with an upwardly directed cylindrical flange I'I overlying and slightly spaced from the lower end of the cup 4. The column 2 is also closed at its lower end and the end closures provide a dead air space I8 within the column. While the lower end of the column 2 could be closed .by bearing directly upon the upper face of the base I, itis-,preferable that it bear upon a washer llllwhichr in turn bears upon the upper face of the base I.V :The'washer I9 may be flat or it may, as shown, be, cup-shaped, that is to say formed similarly tothe washer I6 but with its cylindrical flange 20 extending downwardly and bearing upon the upper face offthe base 2. The washers IG'and ISI areformed with central openings andthe stem 6 extends Aloosely through these openings.. AThe washer I6 is preferably formed withu [aT-downwardly projecting boss ,22 and the washer- .I 9VV is preferably formed with a similar, butt-upwardly projecting, boss 23. The diameters ofthe-

bosses

22 and 23 conform to the internal `diameter ,of the column 2 whereby these bosses have ra -close t. within ythe -adjacent ends of the column and serve two functions, one ofI which is positively to maintain the centered alinementfof the lcolumn ,with respect to -the base I and'thefcup4., and the othenof which lis substantially to` sealffthef dead. air spacell..

The washerII isheat insulated from thecup 4 by piled washers `24 of -suitable'.heat insulating material, e. .g..,`comlpressed asbestos felt, the upper face of the upper washer 24 bearing against the underface of the base v5 of the, cup YIl and the lower face of the lower washer vv2li. bearing against the upper Iface of the .washer v,l6, .A The cuppedform ofthe washer IIlprovides; a closed chamber 25 in which.v the washers 2.4' are arranged.v It will, of course,- .be obvious .-that a single heat'insulatingvwasherof fsuitable thickness -may 4be used instead of, Aand yinthe same relation and for `the same purpose asfthe separate piledwashers 24u 7 .g Y

The slight spacing of --the flange lI1 of the washer `I6 from the. lower end of the `cup 4 substantially yprevents the transmission of=1heat by conduction fromthe cup 4 to the flange I1. 'The washers24 prevent the transmission of heat by conduction fromthe Acup!! to the washer IGand the -column l2. l Any heat: thatvmayf be. transmitted byconductionfromthe Icup .-4 to the stem 6 is substantially occluded from the column 2 by the dead airspace I8 and from the washers I6 and I9 by virtue of their loose t about the stem 6. By virtue of these several heat insulating features the'column 2 atall times remains comfortably cool,- that is to say, substantially at room temperature whereby it may be QmfOrtably grasped when the lamp is to be moved from one position to another. The washer I6 has the further advantage of visually demarking the column 2 from the cup 4 whereby the user of the lamp will naturally grasp the column 2 as a hand grip and will not grasp the cup 4.

I claim:

1. A portable desk lamp of the type which includes a pedestal comprising a base. and an upright tubular column formedv and` proportioned to serve as a hand grip when the lamp is to be moved from one position to another, a lower cup-like reflector directed upwardly, enclosing the lamp bulb with its lower portion adjoining the column and formed as a cup to enclose the lamp socket, the cup having a base, the column "being positioned between the bases of the cup and the pedestal, the bases of the cup and the pedestal being provided with alining central openings, and a stem externallythreaded and extending through the column' and the central openings in the bases of the cup and offtl'e pedestal vand cooperatingfwith the :bases of vthe cup and pedestal as clamping"elements'-iii'relation to the column: wherein thefoppo'site ends of the column, adjoining the baseso f the cup andv the pedestal respectively are" closed to pro vide a dead air' space, the fclos'ure-'atithe'upper end of the column consisting 'of a 'cup-sha ed washer which'abutsthe upper endr of-the'column, has a central opening vthrough"which4 the stem extends looselyfan'd a1's fha$anpwardly projecting cylindrical'` ange which "surrounds and is spaced from the lower end o'f the' cu'p, and additional washer" means of heat insulating"ma terial is interposed between' tlfif'eY cup-shaped washer and the base of the cup'ffy 'f 2. A portable -deslclarr'rpas 'set 'forth' in` claiml wherein the closures forf'th' opposite ends 'of the column which form f the dea'd air space are formed with bosseswhich project'into tha-adjacent ends of the' column -r'a'nd snugly'flt into 'the cylindrical wall thereof, thereby to' maintain the central alineme'nt yof the'Y column with fre'- spect to the bases ofthe pedestal'and-the cup and substantiallyItoseal'tltie dead air space2""= j 3. A portableV desk lamp'asset forth' in claim'l wherein the closure at the lov'v'er'y end of 'the 'column consists of a washer bearingagainst the upper face of the base'of'the pedestal and each of the closurewashers lis' provided ywithfaboss which projects l into the adjacent end ofithe column and'snuglyl lits into a lcylindrical 'wall thereof, 'thereby to maintain -the central" aline-v ment of the column withrespect to' the base of the pedestal and the cup and substantially seal the dead airspace.v l A Vl'nAUltENQE E. CORCORAN.

REFERENCES CITED The following references arepfrecord inthe file of this patent: i n v UNITED STATES PA'I'ENTS ,.2

` Dat'f