US2198934A - Base for electric lamps and similar devices - Google Patents

Base for electric lamps and similar devices Download PDF

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Publication number
US2198934A
US2198934A US264154A US26415439A US2198934A US 2198934 A US2198934 A US 2198934A US 264154 A US264154 A US 264154A US 26415439 A US26415439 A US 26415439A US 2198934 A US2198934 A US 2198934A
Authority
US
United States
Prior art keywords
shell
base
seam joint
lap seam
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US264154A
Other languages
English (en)
Inventor
William G Davis
Harry C Atkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US264154A priority Critical patent/US2198934A/en
Priority to DEP79824D priority patent/DE720587C/de
Priority to GB5261/40A priority patent/GB536931A/en
Priority to FR864344D priority patent/FR864344A/fr
Application granted granted Critical
Publication of US2198934A publication Critical patent/US2198934A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
    • H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap

Definitions

  • One object of our invention .is to provide an.
  • Another object of our invention is to provide an improved base construction for electric incandescent lamps and similar devices.
  • Still another object of our invention is to provide an electric lamp base having a shell provided with a longitudinally extending internal lamp seam joint which is discontinued for a short distance inward from the inner edge or rim of the shell to thereby permit proper application of the base onto the lamp bulb neck andin addition to provide a slot through which one of the lamp.
  • leading-in wires may be led to the outer surface of the shell.
  • a further object of our invention is to provide an electric lamp base having a shell provided with a plurality of relatively small embossments or protuberances arranged around said shell in the form of a helix with one ormore of the embossments adjacentthe rim of the shell displaced a relatively slight amount from the true line 'of the helix to thereby provide means for lockingthe lamp in its socket.
  • Fig. 1 is a longitudinal sectional view of 'an electric incandescent lamp provided with a base comprising our invention
  • Fig. 2 is an elevation of the lamp shown in Fig, 1 taken at right angles thereto
  • Fig. 3 is a top view of the blank from same by solder 28,.
  • Fig. 4 is a side view of the base shell blank showing the manner in which the ends thereof are bent preparatory to the formation of the'lap seam joint' therebetween;
  • Figs. 5 to 8 are end views of the base shell blank showing the successive steps involved in rolling the blank into cylindrical shape and securing the abutting ends together by an internal lap seam joint;
  • Fig. 9 is a fragmentary end view, on an enlarged scale, of the base shell showing the completed internal lap seam joint;
  • Fig. 10 is an enlarged elevation of a finished base shell comprising our invention.
  • the lamp there shown comprises a glass bulb or envelope l0 having a tapering neck portion II and an electric energy translation elementin the form of ,a coiled or coiled coil filament l2 of refractory metal, preferably tungsten, hermetically sealed therein;
  • the said filament is supported within the bulb by a pair of leading-in wires l3, l4 connected to the opposite ends of the filament and having portions sealed into a pressed portion of a stem It.
  • the filament I2 is further supported, at a point intermediate its ends, by a support wire I! fastened to a cane rod l8 extending longitudinally of the lamp from the stem press l5. Additional support wires I9, l9 extend transversely from said cane rod l8 and engage the leading-in wires l3, l4.
  • the said base Secured to the neck portion preferably by cement 20, is a base 2
  • the said base comprises a metallic shell 22,.preferably of brass and having an inturned flange 23 at its dome end, and a metallic bottom contact eyelet 24 secured to said .shell flange by a suitable insulating medium 25,
  • One leading-in'wire l3 extends through a centrally located hole 26 in the base insulation 25 and is connected to the bottom contact eyelet 24 preferably'by solder 21, while the n of the bulb in.
  • leading-in wire I4 is bent back over the neck of the bulb and around the inner extremity or rim of the shell 22 where it is secured to the As shown particularly in Figs; 2 and 10," the interrupted thread for engagement with the .thread of a conventional lamp socket.
  • a sumcient To providje means for locking the base in av socket, one or more of the protuberances 29 at the inner end of the helix, i. e., adjacent the rim 33 of the base shell 22, may be displaced a slight amount, for instance, 0.019 of arrinch or thereabouts, from the true line of the helix.
  • the displacement may be to either side of the line of the helix, i. e., towards the rim' of the base shell or towards the dome thereof, as desired;
  • the displaced protuberances force the other pro-' tuberances against the threads in the lamp socket during the last turn or so of the lamp into its socket.
  • the resulting tight frictional grip between the various base shell protuberances and the lamp socket threads thus provides a form of locking means tending to prevent any unscrewing action of the lamp in its socket which might otherwise result. from vibrations of various nature.
  • the base shell 22 according to the invention .is formed from a blank 30 of metal (Figs. 3-4) which is first stamped with the protuberances 29 out of strip material, then rolled into cylindrical shape, and the abutting ends secured together by an internal lap seam joint 3
  • the internal lap seam'3l is discontinued for a relatively short distance inward from the rim "33 of the base shell.
  • the opposite ends of the metal blank 30 are provided'with notches 34, 34 adjacent that edge 33 which eventually forms the rim of the base shell.
  • the leading-in wire ll, outwardly of the base shell .22, is preferably disposed along the lap seam joint 3
  • is performed by a suitable machine, such as the multi-slid e machine commercially used at present for the production of short lengths of metallic tubing with internal lap seams.
  • when completed, consists of an inner hook or lip 35, formed by inwardly bending one end of the blank .back upon itself, and interlocked with an inwardly offset hook or lip 33 on the other end of the saidblank
  • the edge 31 of the cylindrical shell is rolled or bent inward to form the flange or dome 23, thus completingthe base shell. It is obviously desirable that none of the protuberances 23 be" formed in the base at the lap seam joint 3
  • the pins are stamped in the metal blank from which the base shell is made in the same manner as the protuberances 23 referred to above.
  • a base for electrical devices comprising a shell, said shell consisting of a strip of metal formed in the shape of a cylinder with the abutting ends secured together by an internal lap seam joint and having a plurality of socket-engaging protuberances disposed around its circumference, said protuberances being formedfrom the metal of said shell and being disposed in spaced relation to said lap seam joint.
  • a base for electrical devices comprising a shell, said shell consisting of a strip of metal formed in the shape of a cylinder with the abutting ends secured together by an internal lap seam joint and having aplurality of protuberances disposed around the circumference thereof in the form of a helix and in spaced relation to said lap seam joint.
  • a base for electrical devices comprising a shell having an open end, said shell consisting of a strip of metal formed in the shape of a cylinder with the abutting ends secured together by an internal lap seam joint and having a plurality of protuberances disposed around the circumference thereof in the form of a helix and in spaced relation to said lap seam joint, one or more of said protuberances adjacent the said open end of said shell being offset a slight distance from the true line of the helix.
  • a base for electricaldevices comprising a shell, said shell consisting. of a strip of metal riorly of said bulb, and a base comprising a metallic shell portion secured at its rim to said flared bulb neck, said shell consisting of a strip of metal formed in the shape of a cylinder with the abutting ends secured together by an internal lap seam joint, said lap seam joint being discontinued at a relatively short distance from the rim of said shell-to thereby provide a slit and to permit said rim to uniformly engage said flared bulb neck around the periphery thereof so as to maintain alignment between said shell and bulb neck, one of said leading-in wires extending through said slit and being secured to said shell at said lap seam joint, and said shell having a plurality of socket-engaging protuberances disposed around its circumference.
  • An electrical device comprising a bulb having a flared neck portion,- an electric energy translation element sealed within said bulb, a pair of leading-in wires connected to said electric energy translation element and extending exteriorly of said bulb, and a base secured to said bulb neck and comprising a metallic shell and a bottom contact eyelet secured together by man-- lation, one of said leading-in wires being con- 3 nected to said shell and the other of said leadingin wires being connected to said bottom contact eyelet,,sa.id shell consisting of a strip of metal formed in the shape of a cylinder with the abutting ends secured together by an internal lap seam joint and having a plurality of protuberances disposed around the circumference thereof in the form of a helix and in spaced relation to said lap seam joint.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US264154A 1939-03-25 1939-03-25 Base for electric lamps and similar devices Expired - Lifetime US2198934A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US264154A US2198934A (en) 1939-03-25 1939-03-25 Base for electric lamps and similar devices
DEP79824D DE720587C (de) 1939-03-25 1939-09-29 Metallschraubsockel fuer elektrische Lampen, Entladungsroehren und sonstige elektrische Geraete
GB5261/40A GB536931A (en) 1939-03-25 1940-03-21 Improvements relating to bases for electric lamps and similar articles
FR864344D FR864344A (fr) 1939-03-25 1940-03-23 Perfectionnements aux culots de lampes à incandescence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US264154A US2198934A (en) 1939-03-25 1939-03-25 Base for electric lamps and similar devices

Publications (1)

Publication Number Publication Date
US2198934A true US2198934A (en) 1940-04-30

Family

ID=23004840

Family Applications (1)

Application Number Title Priority Date Filing Date
US264154A Expired - Lifetime US2198934A (en) 1939-03-25 1939-03-25 Base for electric lamps and similar devices

Country Status (4)

Country Link
US (1) US2198934A (fr)
DE (1) DE720587C (fr)
FR (1) FR864344A (fr)
GB (1) GB536931A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5990606A (en) * 1997-12-01 1999-11-23 Ross; David C. Light bulb base having an enlarging external thread

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5990606A (en) * 1997-12-01 1999-11-23 Ross; David C. Light bulb base having an enlarging external thread

Also Published As

Publication number Publication date
DE720587C (de) 1942-05-09
FR864344A (fr) 1941-04-24
GB536931A (en) 1941-05-30

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