US1955629A - Incandescent lamp cap for edison holders - Google Patents

Incandescent lamp cap for edison holders Download PDF

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Publication number
US1955629A
US1955629A US517964A US51796431A US1955629A US 1955629 A US1955629 A US 1955629A US 517964 A US517964 A US 517964A US 51796431 A US51796431 A US 51796431A US 1955629 A US1955629 A US 1955629A
Authority
US
United States
Prior art keywords
cap
lamp cap
lamp
holders
edison
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
US517964A
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English (en)
Inventor
Ghysen Huibert Cornelis
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.)
Vitrite Works NV
Original Assignee
Vitrite Works NV
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 Vitrite Works NV filed Critical Vitrite Works NV
Application granted granted Critical
Publication of US1955629A publication Critical patent/US1955629A/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

  • -It is an object of this invention to provide an improved cap fitting for incandescent electric lamps, more particularly, a cap suitable for insertion in holders or sockets of the Edison type.
  • the glass is poured in a molten and very fluid state into the shells and then subjected to pressure in the machine, the domed portion becomes highly heated.
  • the result of this increase in temperature is that the brass becomes soft at this part and, therefore, can no longer oifer any great amount of resistance in the direction of the axis of the shell.
  • the distance of the central contact disc from the commencement of the screw on the shell be as small as possible, so that for a lamp cap of a given overall length the screw thread shall extend as far along that length as possible. This is desirable in order that the lamp may screw firmly into its socket and may not work loose by reason of vibration.
  • the so-called safety contact fittings which are coming more and more into general use and in which the lamp can only contact with current carrying parts when it is almost completely screwed home into the fitting, are so constructed that they will only receive lamp caps in which the distance of the central contact disc from the commencement of the screw on the shell is as small as possible.
  • the present invention enables the lamp cap to be produced automatically in the Swan ma- .chine, notwithstanding the fact that a high factor of resistance in an axial direction is maintained.
  • the heating of the shell has now no longer any appreciable influence on the ability of the cap to withstand compression in an axial direction.
  • the result achieved with the new shell is a surprising one and must be ascribed, in part, to the favourable action of the ribs or bulges as regards the cooling efiect obtained. By the presence of the ribs or bulges a greater superficial area of material is produced at this part and, consequently, better cooling of the shell at the part where it is most highly heated.
  • ribs, grooves or other reinforcements may conveniently be stamped out in the appropriate part of the lamp cap, for which purpose a die and a matrix of suitable construction are used.
  • the ribs or grooves may also be formed in other ways, as, for example, by rolling the lamp cap under pressure, with the part to be treated over a surface provided with hollows or ribs.
  • Fig. 1 is a view of a constructional example of a lamp cap according to the present invention
  • Fig. 2 is a plan view of the cap shown in Fig. 1
  • Fig. 3 shows a modified construction
  • Fig. 4 a plan View of the same.
  • Figs. 5 and 6 show a further constructional example of the subject matter of the invention.
  • Fig. 1 the incandescent lamp cap as a whole is designated by the numeral 1.
  • Numeral 2 denotes the central contact of the cap
  • 3 is the insulating material and 4 the screw thread.
  • the lamp cap is reinforced by strengthening the domed part thereof with hollows 6 stamped therein instead of using the ribs or grooves shown in Figs. 1 and 2.
  • Figs. 5 and 6 shows a further possible form of construction.
  • the domed part between the outer screw threaded end of the cap and the insulating material is in this case, simply made of corrugated form as shown at '7.
  • the manufacture of this modification is likewise carried out by simple pressing.
  • At the top of the domed portion is an adjoining bezel 7 which partially surrounds the insulating material and holds it securely in the lamp cap.
  • An incandescent lamp cap comprising a threaded cylindrical body portion, a domeshaped portion formed of metal continuing therefrom, an insulating element supported by the dome-shaped portion, a contact cap on the outer end of the insulating element and a circular series of radially extending grooves formed on the outer surface of the dome-shaped portion for reinforcing the latter.
  • An incandescent lamp cap comprising a threaded cylindrical body portion formed of metal, a dome-shaped portion continuing therefrom,
  • Anincandescent lamp comprising a threaded cylindrical body portion formed of metal, a metallic dome-shaped portion continuing therefrom, an insulating element supported by the dome-shaped portion, a contact cap on the outer end of the insulating element, and a circular series of reinforcing elements formed on the outer surface of the dome-shaped portion.
  • An incandescent lamp cap comprising a threaded cylindrical body formed of sheet metal, a dome-shapedportion continuing therefrom, an insulating element supported by the dome-shaped element, a contact cap on the outer end of the insulating element, and a circular series of raised radially disposed ribs formed on the outer surface of the dome-shaped portion for reinforcing the same.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Connecting Device With Holders (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US517964A 1930-02-25 1931-02-24 Incandescent lamp cap for edison holders Expired - Lifetime US1955629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL359310X 1930-02-25

Publications (1)

Publication Number Publication Date
US1955629A true US1955629A (en) 1934-04-17

Family

ID=19785341

Family Applications (1)

Application Number Title Priority Date Filing Date
US517964A Expired - Lifetime US1955629A (en) 1930-02-25 1931-02-24 Incandescent lamp cap for edison holders

Country Status (5)

Country Link
US (1) US1955629A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE537015C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR708621A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB359310A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL27657C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987696A (en) * 1957-10-24 1961-06-06 Gen Electric Lamp base with collared insulator
USD922325S1 (en) * 2019-08-13 2021-06-15 Ningbo Well Electric Appliance Co., Ltd. Lamp cap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987696A (en) * 1957-10-24 1961-06-06 Gen Electric Lamp base with collared insulator
USD922325S1 (en) * 2019-08-13 2021-06-15 Ningbo Well Electric Appliance Co., Ltd. Lamp cap

Also Published As

Publication number Publication date
NL27657C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR708621A (fr) 1931-07-27
GB359310A (en) 1931-10-22
DE537015C (de) 1931-10-30

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