Патент USA US2406145код для вставки
Aug. 20, 1946. ì J. E. HOLMES . FLUORESGENT LIGHTING UNIT . Filed `March v8, 1944 v 2,406,145 ` Í 5 Sheets-Sheet 1 ._ ,2... . l \ \\ „Z5-@banjo 7’ . Aug. 20, 1946. l v- J. E. HOLMES 2,406,145 ` I_‘LUOJRESCENT LIGHTING UNIT Filed March 8,- 1944 3 Sheets-Sheet 2 ì 18 Y ¿wMQLëë-i; Aug. zo, 1946. ' " . ' J. E. HOLMES \ ' Filed Maman 8, _1944 @406,145 3 sheets-sheet s ` - Tipea/¿07" .l ~ dán " _HM @MM Patented Aug. 20, 1946 UNITED 2,406,145 STATES " PATENT OFFICE ' 2,406,145 ' ' FLUORESCENT LIGHTING UNIT John E. Holmes, Auburndale, Mass. Application March 8, 1944, Serial No. 525,531 6 Claims. 1 This invention relates to a fluorescent lighting unit particularlyadapted for illuminating the interior of a show case or the like. (Cl. 240---6) 2 . ì The invention has for an object to provide a novel and improved fluorescent lighting unit of show case or other similar unit to be illuminated and whichA are capable of retraction and ex tension to permity insertion and removal of the elongated fluorescenty lamp, and whose construc J tion is such as to maintain a safe arcing distance the character specified in which provision is from thel terminal connections to the exterior of made for mounting the fluorescent lamp in a novel and improved manner to provide mini mum liability of arcing or grounding from the terminals and whose structure enables it to con form in all respects to the regulations adopted by the National Board of Fire Underwriters. With this general object in` view, and such others as may hereinafter appeanthe invention the safety housing at all times. consists in the lighting unit> and in the various structures, arrangements and combinationsV of parts hereinafter v,described and particularly defined in the claims at the end of this speciiica tion. , In the preferred form of the invention, as em bodied in a showcase, the lighting unit includes a reflector or shield which may and preferably will comprise the front rail thereof, forming a part of the frame of the show case, and support- - ing the adjacent edges of the top and front glass panels. The ends of the show case may and pref erably will be constructed to provide a hollow interior to receive and conceal the wires leading from the supporting sockets. Referring now to the drawings, the present lluorescent lighting unit, indicated generally at _Inthe drawings illustrating the preferred ern--V 20 I0, is preferably illustrated as embodied in a show', ‘o'cdiment4 of the invention, Fig.l 1 is a front eleva tion of a show case embodying the present fluor escent lighting unit, some of the parts being broken away and shown in cross section; Fig. 2 is an enlarged cross sectional view in side eleva tion taken on the line 2_2 of Fig. 1; Fig. 3 is an enlarged detail' view in longitudinal cross sec tion of a terminal housing embodied in the pres- ` ent lighting unit, the housing beinglshown in its case I2 and includes an electric discharge _tube or fluorescent lamp I4, preferably of the cold cathode type which is arranged to be operatively supported at either end in a pair of safety hous ings, indicated generally at I5, and preferably mounted at each end of the show case. `The safety housings I5 may and preferably will be made `of porcelain, glass, Vplastics or other di electric material, and, as herein shown, each ‘ extended position and with one end of the lamp 30 housing includes a `stationary tubular member IB in which provision is made for connecting a .ter inserted; Fig. 4 is asimilar View with the hous minal wire I8, and a longitudinally movable tu ing shown in its retracted position and with the> bular member 2,0 provided with a socket 22 for lamp disconnected; Fig. 5_ is ra perspective view receiving one end of the fluorescent lamp. The. of one end of the lighting unit as embodied in a show case, some of the parts being shown sep- . ` stationary member I6 as herein illustrated is pro arated for clearness of illustration; and Fig. 6 is a cross sectional vieWVof- a »modified form of mounting for use with the present lighting unit, to be referred to. , » In general, the present invention contemplates an improved ñuorescent lighting unit partic ularly adapted for use in illuminating the interior» of a show case or the like and in which provisionv vided with an annular recess 24 arranged to slidingly or telescopically receive a reduced por tion 26 of the tubular movable member 20 Where by‘ tol permit extension and retraction of the socket housing member 20 with respect to the terminal housing member I6 for insertion or re moval of the elongated fluorescent lamp I4. The stationary member is „also provided withA an ex-Y teriorly threaded end portion 28 for cooperation is made for mounting the lighting unit in a novel and improved manner whereby to provide a 45 with a suitable receptor support for the lightin unitto be hereinafter described. " . a Vsimple Aand eñicient >structure for detach ably supporting the contact ends of the iiuoreséA cent lamp in engagement with the terminals pro-è`Y vided therefor, and Whose structure is such-that the liability of inadvertent arcing from the ter minals is reduced to a minimum. Y 'In accordance with .the present invention, the illustrated lighting unit includes a pair of ex-ì tensible socket members comprising safety ìhous--` As best shown in Figs. 3 and 4, the insulated >terminal wire I8` is connected to an adapter 30 which is supported within a central opening 32 ‘formed in a centrally disposed and longitudinally extended cylindrical portion 340i the stationary member I6. The baredend portion of the termi' nal wire I8 is preferably extended through a cen tral bore V35 of the adapter and soldered at the ings Whichmay be supportedat each end of theV 55 extended end in a countersunk portion provided 2,406,145 . therefor. 3 4 Y The adapter 39 is provided with a the outer end of the housing member 20 is equal flanged head 38 which is seated against a portion ¿lû of reduced diameter formed within the open to or in excess of the minimum arcing distance re quired by the National Board of Fire Underwrit ers. Also, the stationary housing member I6 is 5 constructed to dispose the vend oi the flangedV ing .32, the other end of the adapter extending through said portion, and is provided with eX head 38 of the adapter 3E] a sufficient depthV from the threaded end 28 of the housing I6 to assure . `ternal threads for cooperation with a second adapter ‘§32 which is internally threaded. The secondadapter 42 is also provided with a Yiiangedv a minimum arcing distance equal to or in excess ‘ head 4.4 which engages with the top of the cylin of the National Board of Fire Underwriters standards. The remaining point Of. eXposure or possible path of leakage of the current comprises the air space deñned by the distance from the head 44 of the adapter 42 downwardly between the drical portion l34 _of the stationary housing mem ' Vber I5 whenV the two adapters are screwed up » tight as illustrated in Figs. 3y and 4. v Y M As herein illustrated, the socket member 22, which may be ofthe split fuse holder type for yieldingly engaging the end of the iiuorescent lamp, may and preferably will be permanently 15 cylindrical portion 34 and the inner surface of the telescopically engaged portion Zß of the member 2t, then Vacross the bottom edge 2l of fixed within the tubular housing member Zyl. The f1 .such portion and upwardly between the outer attached end of the socket is formed of 'a reduced diameter and extended through a collaredplorf^ surface of the portion 26 and the inner surface of the .tubular outer wall of the member I6 to thetion 46 formed in the tubular member, the shoul 20 outer edge of said member I6.Y In order to assure` dered portion 48 of the socket resting against one the maintenance of a safe arcing distance through the above deñned path at all times lduring the edge off the collaredportion and the extended .end offthefsocket being hushed over or spun against extension or retractionfof the sliding lmember 20, theopposite edge V¿ofthe collar as indicated atv the annular recess 24 is made of suücient depth älltopermanently secure the. socket in place. Y 25 `and the'telescopically engaged portion Z6 is made - In order toprovidea connection' between the of sufficient length so that whenY the movable> terminal connections or adapters 30, 42 carried by. .theY stationary housing member I6 and the member 2li is moved to its position of maximum extension into operative engagement withÀ the lamp, the airspace through the above deñned socket 22 carried by the movable housing mem ber 2.3. and to maintain contact therebetween dur 30 path will-.equal or exceed the minimum distance ing extension and contraction thereof, a sliding or extensible .connection is provided, herein shown Provision is also made for breaking the con _as comprising a female member or bushing 52 tact between the male and female connecting . screwedv into the internally Vthreaded adapter ¿l2 members 5,2, 54 in the event that the movable member 2i! is inadvertently extended beyond the and'aecooperating male> member or slidingcon-A tfact-Ä'lziin..754A` slidingly fitted within the bushing z-‘equi'redV safety distance and tothis end the mem bers> 5,2, 5.4 are so proportioned. as to separate 52.' As herein shown, the outer end of the con--> tact pin 5d -is disposed withinthe socket 22 and` upon suchV abnormal projection of the housing. is; providedV with an ,enlarged head 5.6 for en Howeven as illustrated in Fig.Y 3, a suitable stop gagement withan inwardly flanged portion 58 pin >ilärrnay and preferably rwill be provided in the end .of the male member 5¿4_ forengagement with atfthel bottom of the socket member, as clearly shown in Figs. 3. and 4l Thus, in operation, when the closed Vend of a slotted portion 51 in the fe the socket housing member 21.0 is extended to op malemember v52 to prevent extension of the mov erfatively`- engage theend of the lluorescentV lamp, able -member 2!! beyond the required safe distance as'sh'own in Fig. 3, the contact pin 54 is moved to thus'positively assure the’ maintenance of a required. forward in the bushing 52 while maintaining Contact therewith, When the socket housing member- 2_!l is retracted >to the. full depth of the , . ' safe arcing- 'distance from any live conductor to a Y possible ,grounding pointadjacent the outside @the housíng- Y annular recess 24., as shown in Fig. 4, the female From the description .thus far _it will be .ob member 52 is arranged to pass through the open 50 served that the present .safety housing provides ing in the bottom of the socket 22 formed by the a simple and eflicient unit to permit- extension and-_ inwardly flanged portion l53„ the male mem contraction into and out of operative engagement ber being moved back by the engagement Yof the Withthe `contact ends-.or-«the ñuorescent lamp and Y' endof the lamp during the shifting'thereoi in whose construction is 'such` as to maintain the the removing operation,> or, the male member 55 maximum required separation between any por may remain in' its'extended position to be again tions of the high voltage conductorsto a possible engaged by the bottom .of the socket when the grounding :wint outside the shielding housing latterris `moved forward intooperative engage andthat any `type of metal vreflector o-r metal supe mentwith the. lamp. . porting structure for the housings may be used The present fluorescent lampY housing is- de-v 60 without danger of arcing from the live conduc- . , signed to conform with the standards adopted by the National Board of Fire Underwriters for ter minalsand receptacles for gas tubing operating at high voltages which require that the live ter-v minals andconductors shalljbe so supported asto tors. ‘ _ I . -Referring now to Fig. 1, the present fluorescent lighting unit is preferably» illustrated as enflbtld.ledl in the'ShQWvcaseflZ having top. and .front ’ glass panels En, 16,2 and hollow .end panels §54. maintain a separation of atleast 11/2 inches be~ Asherein shown the saietyhousings .i5 'arey y tween the conductor and, any grounded metal. The present lighting unitfpreferably employs a mounted in. internally threaded receptorsßß in whiplrthey threaded .end 2,8 of the housings may cold `,cathode type of iiuorescent lamp operative at bevreceived.. VThe receptors maybe Vsecu-red 'to the around 15,000 vous andfisfusually providèdwitn 70 inner -wall 68 of each@ end panel 6g byscrews: l0». ai` shield or `reflector which may befmade of metal. In order to provide a1more¢1i-igidf~attachment»to Thus, inthe above described Vembodiment ofthe the. Ypanels and to assure proper alignment; the receptors may beV proyidedwith shouldered por-J invention, the socketmemberçZî‘is disposed at a suiiicient depth'inV the housing member. 20 so that the'distance 'from the top ofthe live socket to tionsaflzzextended'into a bore in thel'inner Wall ' > lThe. receptors.“ :may ybe. made. of ‘a 'plastic 2,4oe,145 5 or other suitable dielectric material, or, they may be made of metal since the construction of the housing is such as to reduce to a minimum any danger of arcing from the live conductors. ‘ .As herein shown, each receptor 66 is preferably fromthe live conducting elements to a possible grounding point adjacent the,v outer ¿surface__~_of thehousing, such as the supporting elements or the lreflector rail whereby to reduce` to a mini mum liability of arcing from» said elements to disposed in theupper front 'corner of the end such possiblegrounding points. rabbeted portion conforming to the contour of following claims. ‘ - y - While the »preferred embodiment of _thegin panels B4 ofthe show case, and, as best shown vention has been herein illustrated and described in Fig. 5, each receptor is rabbeted as indicated it will be understood that the invention may be at 14, around its inner edge to receive the ends of vthe Afront rail'16 of the show case frame, the 10 embodied in other forms within the scope of the . Having thus described the invention, what. is the‘rail to form a flush exterior surface. The rail claimed is: ' . 16 may be secured to the receptors by screws 18 1. In a fluorescent lighting unit for use in a andas thus constructed the front rail serves as a reflector or shield for the elongated lamp. The 15 show case' or'thelike having top and front glass panels and hollow end panels, a pair of safety reflector rail may be made of a suitable plastic housings comprising extensible shielding 'mem bers’for operatively supporting thev ends of'a fluorescent lamp, means for supporting said 'lß‘may and: preferably will be suitably grounded. 1 The frontV rail 16 is also preferably designed to 20 safety housings comprising a- pair of receptors attached to said hollow end panels, said hollow ' support the front edge ofV the top glass panel end panels being arranged to receive and conceal' 60 in a recess 80 formed by an offset 82 in the materialëor maybe made of metal. When Vmade ofîmeta'l; the receptors» 66,'a'nd the reflector rail the Wiring from the unit, a reflector rail com upper lwall 84 of the rail, and, a grooved por prising the front rail o-f the show case frame at tion 86 formed integrally with the front wall 88 of the rail is provided to receive the upper edge 25 tached to said‘receptors and disposed in close proximity to said safety housings, said front rail of .the-front glass panel B2 as illustrated. The having provision for supporting the adjacent reflector rail is preferably designed lto effect il edges of said top and front glass panels, live con lumination of the interior of the show case and ducting elements of relatively high voltage sup to serve as a shield to prevent any glare from the lamp from being directed toward the observer 30 ported within said housings, the arrangement being such that said safety housings may be lon standing in front of or in the rear of the show gitudinally contracted to permit insertion of said case. lamp and thereafter extended into operative'po From the above description it will be observed sition, with all conductive material within said' that when thus embodied in a show case the in housings shielded at all times. ' sulated wire leads I8 may be drawn through thef 2. In a fluorescent lighting unit, a safety hous hollow end panels 64 to thus conceal the lead ing for operatively supporting the end of a fluo wires from view and to leave the interior of the ‘ rescent lamp,4 comprising: an insulating member show case free from wiring or wiring conduits. having an opening therein adapted to receive It will also be observed that the reflector rail conceals the safety housings from the View of 40 an> insulated cable having a bared >end, so that the insulated portion of said cable will extend the observer thus providing a compact and ef to 1a point substantially within said insulating iicient unit for »embodiment in a show case. member; ~ a'_ conducting member vsecured within In some instances, it may be desired to support said insulating member for connection Awith the the ends of the safety housings I5 independently of the ends of the show case, and, for this pur 45 bared end of said insulating cable; an elongated hollow insulating member telescopically associ pose, as illustrated in Fig. 6, a modified form of ated with said first named insulating member; support may comprise a receptor 90 provided a lamp socket secured within said hollow insu with an elbow 92 formed integrally therewith lating member spaced inwardly from both of the and arranged to receive a' conduit 94 through which the wires are extended. The contour of 50 ends thereof; and means maintaining an elec trical connection at all times .between said con the modified receptor may and preferably will ducting member and said lamp socket, the ar be such as to fit snugly within the front reflector rangement being such that said safety housing rail and may be attached thereto by screws 18, as may be longitudinally contracted to permit inser above described. Likewise, the present iiuorescent lighting unit 55 tion o-f said lamp and thereafter extended into operative position, with all conductive material may be supported within the show case inde within said housing shielded at all times. pendently of the front rail. In such instances, 3. In a iiuorescent lighting unit, a safety hous the receptors 9D may be used and a separate ing for operatively supporting the end of a ñuo reflector section attached thereto. Such units may be supported in any position within the show 60 rescent lamp, comprising: an insulating member having an opening therein adapted to receive case remote from the front rail or frame of the show case. Y an insulated cable having a bared end, so that the insulated portion of said cable will extend to a point substantially within said insulating member 20 may and preferably will be provided with an integral lug 2| extending radially there 65 member; a conducting member secured within said insulating member for connection with the from for convenience in sliding the housing mem bared end of said insulating cable; an elongated ber into and out of operative engagement with hollow insulating member telescopically associ the ends of the fluorescent lamp. ated with said ñrst named insulating member; a From the above description it will be seen that the extensible safety housing embodied in the 70 lamp socket within said hollow insulating mem ber spaced inwardly from both of the ends there present lighting unit comprises a shielding mem of; an elongated bushing secured to said conduct ber for the live conducting elements supported ing member and an elongated pin slídably re therein and that the construction of the hous ceived by said bushing and engageable Iwith said ing is such as to maintain at least a predeter mined minimum unshielded distance or air space 75 lamp socket, said bushing and said pin maln As illustrated in Fig. 4, the movable housing 2,406,145 i tairiiii'g‘at al1 'times 'an electrical connection bei tween said conducting member and said lamp socket, the' arrangement being such that vsaid safety housing'> maybe longitudinal]'y'ì'r’bontracted` to permit insertion’ ofïsa'idlamp and'thei‘eaft‘er 'extended into operative position, withv all con diictive material within said 'housing îshielde'd Yat 8 low insulating member; a ¿conducting member secured within said hollow'insulatin'g member for connection with lthe bared end of said ’insulated cable, a secondA 'hollow insulating member tele scopically associatedrwith said first-'named hollow insulating member; a'lamp socket Within said sec'-` ond-named hollòwfinsulating member spaced in wardly from both of the ends thereof; and means VV4.1111' a ñu'oi‘es'cent lighting unit, Ia 'safety ATrous- maintaining an >electrical connection at all times ing for operatively supporting the end of a fluo l0 between said conducting member and said` lamp socket, `the arrangement "being such that `said safety housing may loe'longitudinally vcontracted to permit insertion of said lamp and thereafter extended into operative position, with allV con ductive material within said housing shielded at rescent lamp, comprising: an insulating` inem ber having an opening' therein adapted to'recèi've an insulated cable having a bared end, so that the insulated portionl of îsaid cable will' extend to a point substantially Vwithin said insulating memberçfa conducting'member secured within said .insulating Amemberrfor connection with the al1 times. f ' ‘ 6. In a‘fluore'scent lighting unit, a safetyïhouse Y bared end of said insulated cable; an velongated Vhollow insulating member telescopîcally associ ing for operatively supporting'the end of `ya fluo-k rescent lamp, comprising: an insulating'l :member atediiwith vsaid 'first-named insulating member; a 20 Yhaving a longitudinally rextending opening dis lamp 'socket within said hollow insulating mem posed centrally thereof adapted to receive an ber spaced inwardly from both ofthe ends there insulated cable having a bared Vend 'so that‘the Y of.; an' elongated »bushing secured to said -con insulated portion of vsa'idcable 'extends substane ducting member; an elongated pin slidably re tially within said insulating member, Vand a lon'-L ceived’by said bushing and engageable with said 25 gitudinally extending annular recess arranged lamp socket; and a 'stop member mounted von concentrically with respectV to said opening; a said v-p'in and engageable with' a portion of said conducting member secured within `said 'insulat bushing 'for limiting the outward movement of ing member for connection with the bared end said pin with respect to said bushing, said bush of said insulating cable; an elongated hollow fin-‘ ing and said pin maintaining at all times an elec trical connection between said conducting mem 30 sulating member having a longitudinally 'exe tending portion slidably received in said-annular berrand said llam-p socket, the 'arrangement being recess of said first-named insulating member; a such that said safety housing may be longitudi lamp socket secured within said hollow- insulat nally contracted to permit insertion of said lamp ing member spaced inwardly >from both vof the and thereafter extended into operative position, 35 ends thereof; and Ymeans maintaining an electrif Withgall 'conductive material within said housing cal connection at all times «between said cion , l ducting member and said `lamp socket, the yar 5. In-a‘fluorescent lighting unit, a safety hous rangement 'being such that said safety housing shielded-at all times. ing for operatively supporting the end `of a fluo rescent lamp, comprising: Ya hollow insulating member having an opening therein adapted to receive >an insulated cable having a bared end, so that ‘thevfinsulated por-tion of said cable will extendeto a vpoint substantially within Asaid hol may be longitudinally contracted to permit ‘in--y 40 sertion of said lamp and thereafter extended into operative position, with 'all conductive material within said-housing lshielded at all times. Y JOHN E. YHoLMias.'