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Publication numberUS2857578 A
Publication typeGrant
Publication dateOct 21, 1958
Filing dateJun 5, 1956
Priority dateJun 5, 1956
Publication numberUS 2857578 A, US 2857578A, US-A-2857578, US2857578 A, US2857578A
InventorsThomas Ralph B
Original AssigneeSylvania Electric Prod
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lampholder
US 2857578 A
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Description  (OCR text may contain errors)

R. BQTHOMAS LAMPHOLDER 2 Sheets-Shoot 1 INVENT OR.

5 MM H N EN M B U m C A m Oct. 21, 1958 I Filed Jufie 5, 1956 Oct. 21, 1958 R. B. THOMAS LAMPHOLDER 2 sheets sheet 2 Filed June 5, 1956 INVENTOR. RALPH B. THOMAS 6 ATTORNEY 2,857,578 Patented Oct; 21, 1958 LAMPHOLDER Ralph B. Thomas, Salem, Mass., assignor to Sy lvania Electric Products Inc., Salem, Mass., a corporation of Massachusetts Application June 5, 1956, Serial No. 589,487 Claims. (Cl. 33955) This invention relates to holders for elongated electric gaseous discharge devices having an electrode at each end thereof. More particularly, this invention relates to lampholders for fluorescent lamps.

Certain types of electric gaseous discharge devices, such as fluorescent lamps for example, are provided with a base at each end thereof. Lead-wires extending from each end of the lamp are suitably secured in the base, and electrical contact therewith is established through a lampholder. The lampholder also serves as a means for supporting the lamp. In view thereof, the lampholder must provide positive electrical contact and insure adequate support for-the lamp. In addition thereto, the electrical contact members in the lampholder should be located so that there is no danger of accidental electrical shock. Since certain types of lamp bases are provided with means for partially enclosing the electrical contact members thereof to prevent the danger of accidental electrical shock, one of the objects of this invention is to provide a lampholder which may be employed with this type of base as well as with bases in which the electrical contact members thereof are not so enclosed.

These and other objects, advantages and features are obtained, in accordance with the principles of this in vention by providing a lampholder housing with a block disposed in an opening in the front face thereof. The block is provided with a pair of bores which are in register with a pair of bores of smaller diameter in a boss on the front face of the block. A pair of coiled springs extend into the bores of the block, the ends of the springs which are disposed within the bores being provided with a pairof resilient sleeves which are disposed within the bores of the boss and which receive the base pins on the end of a lamp.

In the specific embodiment of the invention shown in the accompanying drawings,

Figure 1 is a side elevational view of a lamp supported by the lampholders of this invention.

Figure 2 is a vertical sectional view of a lampholder having a movable block disposed in the lampholder housing.

Figure 3 is a front elevational view of of Figure 2.

Figure 4 is a vertical sectional View of a lampholder having a stationary block disposed in the lampholder housing.

Figure 5 is a front elevational view of the lampholder of Figure 4.

Figure 6 is an exploded view of the lampholder of Figure 2 and the end of a lamp with which it is associated, portions of the lampholder and the lamp base being shown in section to illustrate more clearly the manner in which they cooperate with one another.

Figure 7 is an exploded view of the lampholder of Figure 4 and the end of a lamp with which it is associated, portions of the lampholder and the lamp base being shown in section to illustrate more clearly the manner in which they cooperate with one another.

the lampholder ing across the top Figure 8 is a side elevational view, partly in section, of the lampholder of Figure 2 showing the disposition of the movable block during positioning of a lamp.

Referring now to the drawings, particularly Figure 1 thereof, a lamp 1 having a base 2 disposed on one end thereof and a base 4 disposed 'on the other end thereof, is supported by lampholders 6 and 8 attached to a base 10.

Referring now to Figures 2 and 3, the lampholder 6 shown therein comprises a housing 12 having an opening 14 therein within which a substantially cylindrical block 16 is disposed, and a cover plate 18 attached to housing 12 by screw 20. The block 16 is provided with a pair of bores 22. A boss 24 on the front face of the block 16 is provided with apair of bores 26 which are in register with the bores 22. A pair of coiled springs 28, disposed within the opening 14 and extending into the bores 22, are provided with a pair of resilient sleeves 30 which are disposed in the pair of bores 26 in boss 24. The bores 26 are smaller in diameter than the bores 22. To facilitate the positioning of an end of a lamp on the lampholder 6, as will be described more fully below, the top surface of the block 16 is tapered to providea clearance 34 (Fig. 3). The inner wall of the housing 12 which defines the opening 14 therein is provided with a pair of channels 36 within which studs 38 on block 16 are disposed, thereby preventing rotation of the block within the lampholder housing. Each of the coiled spring 28 is supported at one end thereof on a rim 40 formed in a face of metal plate 42 at one end thereof, the other end of metal plate 42 being provided with a screw 44 to which suitable lead-wires from a source of electrical energy may be connected. The inside face of the cover plate 18 of the lampholder is suitably molded to support the metal plates 42 therein.

The block 16 of the lampholder 6 is reciprocable within which the studs 38 are disposed. block 16' of lampholder 8 (Figures 4 and 5) is made stationary by making the channels 36' substantially shorter than channels36 in lampholder 6 and providing coiled springs 28 which will be fully compressed when cover plate 18' is secured to housing 12' by screw 20'.

As was mentioned above,'one of the objects of this invention is to provide a lampholder which may be employed with lamps having partially enclosed contact members on their bases, as well as with lamps which do not have the base contact members so enclosed. The lamp illustrated in the accompanying drawings is of the former type@ The lamp 1 is end thereof of the type shown in my co-pending application Serial No. 589,488 entitled Lamp Base filed on June 5, .1956. Eachof the bases 2 (Fig. 6) and 4 (Fig. 7) comprises a shell 46 within which a disk of insulating material is secured, the disk being provided with a boss 48 of insulating material. The boss 48 is provided with a central opening therein de ng a pocket 50 within which base pins 52 are disposed and a slot 54 extending across the top of the boss.

Installation of a lamp 1 in its lampholders (Fig. 1) is effected by first positioning the base 2 on the lampholder 6. As was mentioned above, the block 16 of lampholder 6 is tapered to provide a clearance 34 (Figs. 2 and 3). Thus, as is shown in Figure 8, the lamp 1 maybe disposed at an angle to the horizontal as the boss 48 on'the lamp base 2 is moved into encompassing relationship with respect to the boss 24 on block 16 of lampholder 6, the boss 24 being tiltable within the limitsprovided by the clearance 34. The slot 54 extendof boss 48 of base 2 also facilitates positioning of the lamp 1 on the lampholder 6 because it On the other hand,

provided with a base at each 3 permits initial engagement of the boss ,48 with the boss 2.410 be,,madelfromithe-side as well as end-on.

After. thelboss. 48. of. base 2 hasbeenpositioned on-the l. Atlampholder for a lamp havinga pair. of base. pins extending from;-anend thereof, said ,lampholderucomprising: a housing having anopeningiin a facethereof; ablo ck disposed withinsaid 'openin'g, said blockhav ng a pair of bores extending therethrough; means, vfor, re taining said block within saidjopeningaa boss,- on; the:

front face of said block, saidboss having a pair oi-bores extending therethrough and in register, with said ,bores in said'block; a pair of; coiled springs disposed within said housing and extendingjntosaid boresin saidblock; a pair of resilient sleeves, disposed within-said bores:

insaidboss and attached .totheends of said coiled springs, disposed withinsaidbores in. saidwblock, for receiving,

the basepins extending from (an end1of alampyand means through which the otherends of said coiled springs maybe connected to'a source ,of pelectricalienergy.

2. A lampholder for a lamp hayingapairof basepins extending froni, an endithereof, said; lampholder com,

prising; a housing having anopening; :ima face thereof and apair of channels formed in-,the;,si de;wall of said housing defining, .said opening and extend ng .from front to rear, thereof; a block disposed :within 1 said opening,

said blockhaving I a pair of studs, projecting-.itherefromand extending. ,-,into said channels andgaupain of.boresextending therethrough; a boss on the-.front face of said block,- i 1-;b0ss,- hay ng atpairz of bores extending therethrough and-in register with, saidrbores insaidblock; a pairofco led;:$plil1gS:disposed,within' said housing and tend n -in o v coiled springs may be connected to atsourceof electricall-i boresinsaid blockya pair of resilient sleeves, disposediwithinz said boresin- -said -boss and attached to .the ends, ofi-jsaidscoiledsprings I disposed within extending frorn an endlof a =la'mpg-"and means through which thetpther endsiofi. said coiled-springs maybe-comnected ito a source of electrical energy-r 3. A; lampholder for .a larnp having a pair-offbase-pins:

extending froman endrthereofl said lampholder com- P 'iSingL' a housing having an opening in-a facethereof;

a block ,disposedwithin said- -opening, sai'd *block'having a pair; of bores extending "therethroughj means for refront face of-saidblock, said boss-havinga pair of;bores extending: therethrough and-in-register-with said bores in.saidblock, saidqbores-insaid boss; being of .smaller. diameterthansaid bores-in saidiblock; ,a' pair of coiled springs disposed-within said -housingyand extending into;

said sb'ores in said blockg-a pair pf-resilient'sleeves, ,dis-

posed within said-boresin-saidboss 'andpattached to the ends; of said: coiled *springs disposed 'within said bores in said block, for receiving, the base pins extending ;from

an end -of-a' lamp; andameans through. which the ,other:

ends of; said coiled springs may be connectedtoa source of electrical energy.

4.;A-glampholder for a lamp. having a;-pair,,of-base-.

pins extending from an end thereof, said lampholder;

and extending;intotsaid channels and;aipaireoftlaores ex tending therethrough; a boss on the front face of said block, said boss having a-pair of bores extending-there= through and in register with said bores in said block, said bores in said boss being of smaller diameter than said bores in said block; a pair of coiled springs disposed within said housing and extending into said bores in said block; a pair of resilient sleeves, disposed within said bores in said boss and attached to the ends of said coiled springs disposed within said' boresin said block, for receiving the, base pins extendingtrom anrend' of a lamp; and means throughywhichthe other endswof'saidicoiled springs may be connected to a source of electrical energy.

5. A lampholder. for a lamp vhaving a pairflof base pins extending from an end thereof, said lampholder comprising: a housinghaving.an;opening -in a face thereof; a block disposed within said opening, said block being provided with a clearance with respect to the opening within which it is disposed, and said block being further 'provided with a pair of. bores extending therethr0ugh',i,

means for retaining said block within said lopeningy a boss on the frontv face of said block, said boss-having, a pair of bores extending therethrough and in register with said boresin said block;,a pair. of ooiledfspringsdid,

posed within said-housing and extending .intosaid bores. in said block; a pair' of resilient sleeves, disposedawithin said boresin saidboss and attached to theends ofysaid'c. coiledflspringsidisposed within said bores .insaid block, for receiving the base pins extending froman end-of: a lamp; andvmeans through whichthe other ends ofsaidq energy. a

6. A lampholdenfora .lamp havingqa-pairi of base p1ns;.:

extending from an end thereof, said lampholder: com-:

prising; a housing having an openingirea-iacefithereoiia and a pair of-channels=formed-inrthesideg-wall.ofssaidc. housing defining; said opening and extending fromi front .4 to rear thereof; ablockdisposed \within saidaopening 'l .said :block being providedvwith a clearance, with respect;

to the opening within which itgis: dis'posed,;:andmsaid2block1, having a pair of studs projectingitherefrom:and::extending i into said channels, and a ,pair'of horeszextendingstherea through; a'boss onthe1front face.of;saidi block, SillzbOSSl having a ;pair of bores: extendinggtherethrough v andrint V register, with-saidbores in said: bloclc; a :pair' of; coiled springs disposed :within said; ht'msing-sand:v extending into said bores in said block; a pairseoii resilientsleeves; disposed within said bores. in. said iboss and-attached toathe' ends' of said coiled springs; disposed withinzsaid' bores =i1r=said=- oc f0r1receiving1thebase=pins extendinga from an end" ofga lamp; and means -through. which :theao'therends of said coiled springs may be connected to asource'ofi' electrical; energy.

7. A lampholder for a lampnhavingea pair ofbasepins extending .r from: an end: thereof, said lampholder comprising: a housing having an opening in-a face thereof; a block. disposedwithin said opening, said block being providd with a..clearancewith respectto the opening within which it is disposed, and said block being further? providedwith a pair-of bores-extending th'erethrough;

means for retaining said block Within said opening-and preventingrtrotation therein; a bosson-the front face'of saidjrblock said boss having a pair of -bores extending;

therethrough and in register with said bores in said block;- a pairzof coiled springs disposed within saidhousing and extending into said bores in said block; a pair of resilient sleeves, disposed within said bores in said boss att-achedto: theendsof'saidcoiled springs disposed within saidbores in said:block,-for receiving the base pins extend-.

ing from.:an end of a lamp; andmeans through-which the other ends of said coiledsprings'may be'connected to a source of-electrical energy;

8.' 'A-:.lampholderfor a vlamp havingqa base securedi to ;an end-thereof, in which thebase includes a pairfofif' base pins anda boss having a'central opening definingg;

a pocket within which the base pins are disposed, said lampholder comprising: a housing having an opening in a face thereof; a block disposed within said opening, said block having a pair of bores extending therethrough; means for retaining said block within said opening; a boss on the front face of said block, said boss having a pair of bores extending therethrough and in register with said bores in said block, and said boss fitting into said central opening in said boss on said base; a pair of coiled springs disposed within said housing and extending into said bores in said block; a pair of resilient sleeves, disposed within said bores in said boss and attached to the ends of said coiled springs disposed within said bores in said block, for receiving the base pins disposed within said pocket in said boss on said base; and means through which the other ends of said coiled springs may be connected to a source of electrical energy.

9. A lampholder for a lamp having a base secured to an end thereof, in which the base includes a pair of base pins and a boss having a central opening defining a pocket within which the base pins are disposed, said lampholder comprising: a housing having an opening in a face thereof and a pair of channels formed in the side wall of said housing defining said opening and extending from front to rear thereof; a block disposed within said opening, said block having a pair of studs projecting therefrom and extending into said channels, and a pairof bores extending therethrough; a boss on the front face of said block, said boss having a pair of bores extending therethrough and in register with said bores in said block, and said boss fitting into said central opening in said boss on said base; a pair of coiled springs disposed within said housing and extending into said bores in said block; a pair of resilient sleeves, disposed within said bores in said boss and attached to the ends of said coiled springs disposed within said bores in said block, for receiving the base pins disposed within said pocket in said boss on said base; and means through which the other ends of said coiled springs may be connected to a source of electrical energy.

10. A lampholder for a lamp having a base secured to an end thereof, in which the base includes a pair of base pins and a boss having a central opening defining a pocket within which the base pins are disposed, said lampholder comprising: a housing having an opening in a face thereof; a block disposed within said opening, said block being provided with av clearance with respect to the opening within which it is disposed, and said block being further provided with a pair of bores extending therethrough; means for retaining said block within said opening; a boss on the front face of said block, said boss having a pair of bores extending therethrough and in register with said bores in said block, and said boss fitting into said central opening in said boss on said base; a pair of coiled springs disposed within said housing and extending into said bores in said block, a pair of resilient sleeves, disposed within said bores in said boss and attached to the ends of said coiled springs disposed within said bores in said block, for receiving the base pins disposed within said pocket in said boss on said base; and means through which the other ends of said coiled springs may be connected to a source of electrical energy.

References Cited in the file of this patent UNITED STATES PATENTS 2,695,388 Pistey Nov. 23, 1954 2,716,738 Pistey Aug. 30, 1955 2,716,739 Lemmers Aug. 30, 1955

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2695388 *May 29, 1951Nov 23, 1954Gen ElectricLamp holder
US2716738 *Aug 30, 1954Aug 30, 1955Gen ElectricLampholders for tubular lamps
US2716739 *Sep 15, 1953Aug 30, 1955Gen ElectricLamp base and holders for double ended electric-discharge lamps
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3268718 *May 9, 1963Aug 23, 1966Scm CorpLight reflector assembly
US3353140 *Apr 26, 1965Nov 14, 1967Kulka Electric CorpFluorescent lampholder with selfaligning sealing means
US6632100Apr 23, 1997Oct 14, 2003Anthony, Inc.Lighting system method and apparatus socket assembly lamp insulator assembly and components thereof
US6641419Aug 31, 1998Nov 4, 2003Anthony, Inc.Lighting circuit, lighting system method and apparatus, socket assembly, lamp insulator assembly and components thereof
US6773130Aug 29, 1997Aug 10, 2004Anthony, Inc.Lighting circuit, lighting system method and apparatus, socket assembly, lamp insulator assembly and components thereof
Classifications
U.S. Classification439/244
International ClassificationH01R33/05, H01R33/08
Cooperative ClassificationH01R33/0845
European ClassificationH01R33/08H2