v SYS i f ì V Dec. 19, w, E, ANDERS ON 2,183,952 Filed' May 15, sheets-sheet 1 FUSE LEAD CONSTRUCTION FOR ELECTRIC LAMPS ATTO R N EY - PDF

Description
Dec. 19, w, E, ANDERS ON 2,183,952 FUSE LEAD CONSTRUCTION FOR ELECTRIC LAMPS Filed' May 15, sheets-sheet 1 d, lnventor 45 fz K 7»WM5/amm v SYS i f ì V ATTO R N EY Dec. 19,l w. E. ANDERSON

Please download to get full document.

View again

of 6
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information
Category:

Presentations & Public Speaking

Publish on:

Views: 29 | Pages: 6

Extension: PDF | Download: 0

Share
Transcript
Dec. 19, w, E, ANDERS ON 2,183,952 FUSE LEAD CONSTRUCTION FOR ELECTRIC LAMPS Filed' May 15, sheets-sheet 1 d, lnventor 45 fz K 7»WM5/amm v SYS i f ì V ATTO R N EY Dec. 19,l w. E. ANDERSON 2,183,952 FUSE LEAD CONSTRUCTION FOR ELECTRIC LAMPS Filed May l5, Sheets-Sheet 2 BYE1 \ n ATTORNÉY ' ' Patented Dec. '19, ,183,952 ' UNITED STATESv lprxrlëzn'r OFFICE, 2,183,952 Y FUsE LEAD CONSTRUCTION Foa ELECTRIC LAMPS - Waldemar E. Anderson, Montclair, N. J., assigner to_ Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania ApplicationvkMay 13, 1938, Serial No. 207,704 li8 Claims. This invention relates to electric 'lamps and more particularly to the construction of the fuse lead in high wattage lamps generally designated as bipost lamps. ' Y ~ During recent years it has become the practiceto use fuses in certain classes of gas-filled lamps, for protection against destructive arcs upon fail ure of the lamp filament. The designs'commonly used previously either incorporate the fuse ele m ment in one of the leads exterior of the lamp bulb; fo'r example, in the stem-tube between the press and thebase, or internal as a part of the inner lead between the press and the filament. l In both designs, however, the fuse has always been of the series type kwhere the lead is assembled by butt-welding the different parts together one after the other. _, In bipost lamps, however, only the internal type of fuse is practicably applicable and since 20 the lead wires must carry the entire mechanical load of the internal structure of the lamp, as well as the current, the series type of fuse introduces a weak link in the supporting structure which necessitates the use of expensive bracing parts 25 3 O Ul to permit shipping the lampv and to withstand ordinary handling by the user. Likewise, the sec ondary arc produced by the operation of the fuse, when the lamp fails hot, tends to maintain it self between the ends of the adjacent larger parts _of the lead wires, producing a comparatively large amount of hot metal and fuse cover ma terial which scatters onto the bulb, resulting in consequent danger of breakage or explosion. To overcome such objections, as well as avoid the necessity for Aexpensive butt-welding equip ment, I have designed and demonstrated in lamps, a fuse lead construction which not only eliminates hazards from secondary arcs pro duced by the operation _of the fuse itself, and provides a rigid structure to withstand shipping and handling; but is also much less expensive to manufacture. It is, therefore, a principal object of my inven tion to providea gas-filled lamp, particularly of the bipost construction, comprising a rigid mount including a fuse, in order to avoid destruc tive arcs upon failure of the lamp, said mount p vbeing formed so as to avoid being weakened by the fuse lead feature. Another object of my invention is the pro vision of a high-wattage lamp of the bipost type comprising a rigid mount, associated with-none _of the leads of which is a fuse. ' A further object of my invention is the pro vision of a fused bipost lamp, which avoids butt (Cl ) weld fuses and substitutes what might be termed a shunt fuse arrangement.. A still further object of my invention is the formation of a construction for lamps in which a fuse is so enclosed that arcing, upon failure of the lampandthe operation of the fuse, is mini mized. '. Other objects and advantages of the invention relating to the particular arrangement and con.struction of the various parts will become appar ent as the description proceeds.. In the drawings: Fig. 1 is a side elevational view of anl incandes cent electric lamp of the bipost type embodyingv my invention.,, Fig. 2 is an enlarged detail view of the fuse portion of the lamp of Fig. l, partly on line II-II.of Fig. 3, in the direction of the arrows. Fig. 3 is an enlarged horizontal sectional View,on the line III-III of Fig. 2, in the direction of the arrows. Fig. 4 is an elevational view of the base and vleads of the lamp of Fig. 1, prior to insertion oî the fuse. Fig. 5 is a partial elevational and partial ver tical sectional view, as in Fig. 2, of a fuse for a lamp such as shown in Fig. 1, but illustrating a modification. Fig. 6 is a view corresponding to Fig. 5, but showing another embodiment of my invention. Fig. 'l is a fragmentary view of a portion of a, bipost lamp corresponding generally to Fig. 1, but showing another embodiment of my inven tion. Fig. 8 is an enlarged detailed view of the fuse lead, on the line VIII-VIIIv of Fig. 7, in the di rection of- the arrows.. ' ' - Fig. 9 is an enlarged horizontal sectional View of said lead on the line IX-IX of Fig. 7, in the direction of the arrows. Fig. 10 is an elevational view of a mount for another embodiment of my invention. Fig. 11 is ay fragmentary elevational view on the line XI-EH of Fig. 10, in thedirection of the arrows. Fig. 12 is an enlarged horizontal sectional view on the line XII-«XII of Fig. 10, in the direction of the arrows.. ' Referring to the drawings Ain detail, like parts4 being designated by like reference characters, and first considering the embodiment of my invention illustrated in Figs. 1 to 4, inclusive, there is shown a high-wattage lamp I4, of the medium bipost type, comprising an envelope I5 provided with a base I6, through which extend leading-in Y ' i _ 2 conductors I1 and 8 from terminal posts I9 and 2. The leading-in conductors I1 and I8 may be formed hollow to receive the conductors orsup port leads 22 and 23, the lower ends of which may be secured to said conductors I1 and I8 in 4any desired manner as'by crimping, asindicated at 24 and 25. The free or upper ends of the conductors 22 and 23 are, in the present em bodlrnent, connected by wires 25 and 21, the outer ends of which are spot-welded thereto, and the inner ends embedded in a glass or other insula ting portion 28. Intermediate portions of the conductors 22 and 23 are likewise connected by wires 29 and 3 ), the outer ends of which are embedded in a glass or other insulating portion 3. The filament 32, illustrated as of the coiled variety, is shown mounted between the conduc 20,tors 22 and 23 and the insulators 28 and 3, the end' sections 20 of said filament being fitted over stifi ening wires, and filament and wires welded or otherwise secured to the conductors 22 and 23, and the intermediate portions draped over hooks 33, 34, and 35, extending from the insulator 28 and hooks 38 and 31, extending from the corre sponding insulator 3. The insulators 28 and 3 also desirably carry wires or spuds which serve to support screens.or other means for Icollecting material vaporized from the filament, thereby minimizing the black ening of the bulb. 4For this purpose, the insu lator 28 has spuds or support wires 38 and 39 which extend'laterally therefrom and to which. 35 the vaporized metal collecting screen 4 is se cured, as by means of spot-welding. The screen 4 may be inverted V-shaped, as viewed from the side (not shown), and straddle the insulator 28, see the corresponding screen shown in Fig. 11. The elements or arms of the screen 4 are secured to the corresponding spuds extending from opposite sides of the insulator 28.'. In the same way, a vaporized metal collecting screen 42 is desirably supported from the insu 45 lator 3 by spuds or wires 43 and 44 extending from the sides thereof and to which the screen is desirably spot-welded. The screen 42 is de sirably V-shaped, like the corresponding screen illustrated in Fig. 11 and straddles the insulator 50 3,.like the screen 4 thereabove. l When the envelope I5 has been filled with an inert gas and sealed, the lamp, as just described, is one of the high-wattage type, suitable for pro jectioni'ïor general lighting purposes. On account 55 of carrying the necessaryvhigh current, failure of the filament is apt to result in a destructive arc between the adjacent ends of said filament. In order to avoid such an arcing,^i provide, in the present embodiment, a fuse 45 for the con 60 ductor 23. 'I'his fuse may be inserted by cutting the conductor 23_at the point 48, as shown in Fig. 4, as by means of shears 41, and then fitting an insulating lead-bracing tube 48 over vthe stub 49 of the conductor 23, as shown most clearly 65 in Fig. 2. After applying a glass or refractory bead 5 'in the tube 48 above the free end of the stub 49, I thereafter insert the portion 52 of the con- ' ductor 23, which was cut off in the operation 70 described in connection with Fig. 4, thereby rig ' idly uniting the adjacent ends of the portions and 52, while at the same time insulating them against the ñow of current therebetween. The tube 48 is desirably formed of a rigid refractory Alsimag, which is a kind of porcelain or re 2,183,952 fractory like lava, being mentioned as an exam ple, but, if desired, a glass tube may instead be satisfactorily used. The fuse 45 of the present embodiment is formed as'a wire of nickel, or other suitable fuse material, of sufficienti cross section to carry the normal current without overheating, but which will fail by fusion upon the passage of excessive current which might flow upon the formation of an arc between the broken ends of the filament 32. The fuse 45 has most of its length enclosed in a tube 53, which may be of material corre sponding with that of the tube 48, that is of Alsimag, glass, or the like, as desired. The free ends of the wire 45 are desirably wound around the lead sections 49 and 52 and spot-welded thereto, as indicated at 54 and 55, thereby tightly holding said lead portions together and prevent ing their removal from the tube 48. By positioning the fuse 45 parallel to the adja cent ends of the supporting lead sections 49' and 52,1 provide a structure which is sufiiciently rigid t o withstand shipping and handling and is also much less expensive to manufacture. The close fitting refractory or'glass tube 48 provides rigid ity for the lead 23, practically equivalent to that before cutting, and the fuse 45, of suitable size and material, ties the two parts of the main lead together, producing a rigid unit. With a close fitting refractory, tube 53, over the fuse, the action thereof is of the expulsion type;,that is, melting occurs inside, rather than outside, of the tube 53, due to said tube acting as a heat insu lator, whereby upon melting, the metal vapors formed forcibly blow out the fuse sections at the ends of the cover tube, thereby quenching the arc formed by blowing it apart. Lamps man» ufactured with this type of fuse lead construc tion have shown it to be effective. Referring now to the embodiment of my in vention illustrated in Fig. 5, the fuse lead 23a is there shown interrupted and providedí with a portion 45 reduced in section to correspond with that of the fuse 45 of the preceding embodiment. This section is desirably constructed of a piece 1 of nickel, or other suitable fuse material, of prop er dimensions to provide the desired fuse char acteristics, and has its ends secured to the adja cent ends of the heavy lead portions 49a and 52, as by welding, indicated at 54 v and 55. The composite lead 23'» then has applied there over a refractory, glass, or other insulating tube 48, desirably closely fitting the heavy lead por tions 49ß,and 52, and secured in place in any desired manner as bymeans of metal spuds 56 and 51, welded or otherwise secured to the lead sections 49I and 52 adjacent the ends of the tube 481. Inlthe present embodiment, the lead bracing tube 48n is shown provided with a hole 58 in its side, pointing away from the other lead (not shown), so that the air will be efficiently exhausted therefrom during manufacture of the lamp, and any vapors formed during melting of the fuse 45 t are discharged away from said other lead. ' Fig. 6 illustrates an embodiment of my in vention correspondingk with' the fuse arrange ment of Fig. 5, with modified features. Although the tube 48 preferably closely fits the lead sec tions 49b and 52 , it need\ not fit closely, as the construction is here rigidifled by coils of wirev 59 and 60 which closely surround the ends of the lead-bracing tube 48b and have their outermost ends coiled around the lead sections 491 and 52b and welded or otherwise secured thereto, as indi , ' cated at 8l and 82. If the tube 48b loosely nts the sections 49b and 52, the aperture 88 may be omitted as the space around loose-fitting sec tions serves the same purpose. It will therefore be seen that this construction provides additional rigidity by securing the ends of the tube 48b to the main lead sections 49b and 52b by supple mental wire portions, in addition to the fitting of the lead sections in the tube itself. Referring Inow to the embodiment of my in vention illustrated in Figs. 7, 8, and 9, there is shown a fragmentary portion of a medium bipost lamp I4 comprising an envelope l5 provided with a base 8 through which extend leading-4 in conductors I1 and I8, from terminal posts I9 and 2I. Extending from the conductors I1 and I8 are I support leads 22 and v23 connected by wires 29 and 30, the outer ends of which are spot-welded 'thereto and the inner ends embedded in a glass or other insulating portion 31. Although only the lower bracing device 29, 89, 8I is shown, it will be understood that the upper ends of the support leads are desirably connected by a brac ing device similar to that shown in Fig. l and designated by the reference characters 26,21, 28. However, the filament may instead be supported as in the embodiment of Figs; 10, 11, and 12. Between the leads. 22, 23, and the bracing de vices, or above or beyond the bracing device, is 'mounted an' incandescible filament ' desirably Y, corresponding with that designated by the refer 60 10 75 encecharacter 32 in Fig. 1. As in Fig. l, screens, or only one, as shown and designated by the ref erence character 42, may be employed for col lecting vaporized filamentary material duringí operation of the lamp. In the present embodiment, the~lead 23 is formed in two sections: a lower section 49 and an upper section 52. The section 49 is secured to a metal connector plate_63 as by welding, and the section 52 is secured to a similar metal con necting plate 64, desirably in the same manner. These plates are 'separated by an insulating plate of mica or other suitable material 65, and held in assembled relation, as illustrated, by bolts 66 and nuts 61 passing through associated insulating _washers 68 and 89, and suitable aper' tures in the associated plates 83, 84, and 85, in order to rigidly connect the parts 49 and 52, forming the support lead 23, while insuring that said parts are insulated from one another. As ingtheembodìment of Figs. 1 to 4,k inclusive, I provide a bipass or parallel fuse device 1l r which, in the present embodiment, consists of terminal wires'12 and 13 tightly fittingin the ends of an insulating bracing tube 48 formed 0f refractory material or glass, like the tube 48 of the first embodiment. Between the enclosed end portions of the terminal wires 12 and 13 which form in effect extensions of the lead sections 52 and 49, extends a fuse wire 45, which may cor~ respond with the fuse wire 45 ofthe first em bodiment. The ends of the members 12 and 13 are desirably bent at right angles to the tube 48 and respectively secured to the upper.lead section 52 and the lowerlead section 49, as by spot-welding or in any desired manner, thereby further rigidifying the connection between the lead sections 49 and 52. Referring now to the embodiment of my in vention illustrated in Figs. 10, 11, and l2, there is disclosed a mount for a medium bipost lamp, said mount being provided with a base I8 and leading-in conductors I1.and l8 having ter 2,183,952 minal posts 9 and 20. Extending from the conductor I1, is a relatively thick or heavy 'sup port lead 22, to the upper end of which is se cured an angular extension 14, as by spot-weld ing indicated at 15, and a short piece of wire or spud 18 carrying a glass insulator 11. Extending from the leading-in conductor I8 is a relatively thin or light support lead 23 formed as a lower section 49, and an upper sec tion 52, said sections having their adjacent ends tightly fitted in an insulating bracing tube 48. formed of glass or refractory material, and elec trically connected by a.fuse wire 45 extending through said tube. In order to further brace the relatively light fused lead 23, the tube 48 is bound vto the relatively heavy lead 22 by straps or wires 18 and 19, so that the whole structure is rigidified., The upper section 52 of the lead 23 is desir ably angular and connected to the angular lead extension 14 by wires 29 and 30, the outer ends of which are spot-welded thereto and the inner ends embedded in the glass insulator 11. Said insulator carries supporting hooks 8, 82, 83, 84, and 85, over which a filament 32 is draped, the end»sections 20 of said vfilament being fitted over rigidifying wires, and filament and wires connected, as by welding, to the ends of the lead extension 14 and the upper lead section 52, as indicated at 86 and 81. As in the preceding embodiments, an angular or V-shaped screen 42, for collecting vaporized iilamentary material, may be carried by the insulator 11 through sup porting spuds 43 and 44. In view of the foregoing disclosure, it will be seen that I have devised a novel fuse lead con struction, especially adapted for high-wattage lamps of the bipost type, and avoiding weakening the mounts of such lamps by the inclusion of a fuse in a supporting lead thereof, while at the v410 same time making it possible to manufacture such lamps economically and without serious manufacturing diiiiculties. Although preferred embodiments of my.inven rtion have been disclosed, it will be understood' that other modifications may be made within the spirit and scope of the appended claims. I claim:. l. An electric lamp comprising an envelope, a base- for said envelope, a pair of support leads 50 extending from said base, a filament enclosed in said envelope and supported by said leads, insu lating bracing means tightly fitting a portion of one of said leads, and a fuse associated with said bracing means An electric lamp comprising an envelope, a base for said envelope, a pair of support leads extending from said base, a filament enclosed in said envelope and supported by said leads, one of said leads being formed in twoparts, insu lating bracing means connecting said parts', and a fuse blpassing said bracing means. 3. An electric lamp comprising an envelope, a base for said envelope, a pair of support leads extending from said base, a filament enclosed in said envelope and supportedvby said leads, one of said leads having an intermediate portion en closed in aninsulating tube and separated by an insulating member therein, and a fuse exterior of said tube, the ends of said fuse being connected 70 to said lead adjacent opposite ends of said tube.. 4. An electric lamp comprising an envelope, a base, a pair of support leads extending from said base, a filament supported by said leads, one of said leads being in two segments, and the adja 10 ' cent end portions of said segments ñtted in an insulating tube while separated by an insulating member, and an insulated fuse device parallel- ing. said tube and with its ends secured to said lead segments beyond the tube. 5. An electric lamp comprising an envelope, a base, a pair of support leads extending from said base, a ñlament supported by said leads, one of said leads having a portion thereof reduced in.section to provide a fuse, land an insulating brac ing tube tightly ñtting said lead and enclosing said fuse., 6. An electric lamp comprising an envelope, a base, a pairl of support leads extending from said base, a ñlament supported by said leads, one of said leads being formed in two sections con nected by va fuse,v an insulating tube enclosing said fuse and re
Related Search
Similar documents
View more...
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks