US3883734A - Bulbholders - Google Patents

Bulbholders Download PDF

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Publication number
US3883734A
US3883734A US424002A US42400273A US3883734A US 3883734 A US3883734 A US 3883734A US 424002 A US424002 A US 424002A US 42400273 A US42400273 A US 42400273A US 3883734 A US3883734 A US 3883734A
Authority
US
United States
Prior art keywords
bulbholder
bulb
open
open end
end portion
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
US424002A
Other languages
English (en)
Inventor
John Richard Lincoln Joiner
Alan John Covel
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.)
Carello Lighting PLC
Original Assignee
Lucas Electrical Co Ltd
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 Lucas Electrical Co Ltd filed Critical Lucas Electrical Co Ltd
Application granted granted Critical
Publication of US3883734A publication Critical patent/US3883734A/en
Assigned to CARELLO LIGHTING PLC, A BRITISH COMPANY reassignment CARELLO LIGHTING PLC, A BRITISH COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LUCAS ELECTRICAL LIMITED, A BRITISH COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/05—Two-pole devices
    • H01R33/46—Two-pole devices for bayonet type base

Definitions

  • ABSTRACT A bulbholder comprises a cylindrical body open at both ends and formed integrally with a lamp reflector.
  • the body is formed internally with recesses to receive, in bayonet fashion, a bulb.
  • a compression spring 10- cates the bulb in the recess and is supported in the body thereof, in one embodiment, by a hooked extension of the spring which engages with a rim formed in the body adjacent the bulb receiving end thereof.
  • the extension of the spring is secured to the body by a rivet which also secures an electrical terminal thereto.
  • This invention relates to bulbholders and is more particularly concerned with bulbholders of the bayonet type.
  • the tool is complicated and requires constant maintenance and, in the second case, a bulbholder body is provided which has apertures therethrough so that sealing problems to prevent ingress of dirt and moisture are encountered during use of the bulbholder.
  • the withdrawal of the core from that end of the tubular body into which the bulb is inserted in use necessitates the production of a body which tapers outwardly towards that end of the body in order to enable removal of the core.
  • This outward tapering of the body means that the body cannot be made to be a close fit around the bulb with result that the filament of the bulb is not always consistently positioned relative to the bulbholder. This latter consideration is important where the bulbholder is employed to locate the bulb relative to a dished reflector where it is necessary to position the filament accurately relative to the reflector.
  • a bulbholder comprising a tubular body open at both ends, opposed recesses and shoulders in said body for receiving in bayonet fashion a bulb when passed into the body via one of the open ends thereof, resilient means disposed in said body and arranged to urge the bulb, in use, against said shoulders, and stop means for preventing resilient means from passing through the other open end of the body.
  • the stop means may comprise a bar extending transversely of the body adjacent to said other end thereof to be located in opposed apertures in the body, but preferably comprises at least one extension of a compression spring forming the resilient means.
  • the or each extension may include an outwardly turned end portion of the spring adjacent the said other open end of the body, the or each said outwardly turned end portion being engaged in a recess or aperture in the body adjacent the said open end thereof.
  • the or each turned back end portion terminates in an outwardly directed hook, said turned back end portion extending from the end of the spring adjacent the said other open end of the body in a direction towards the said one open end so that the hook engages a rim of the body around said one end thereof.
  • the bulbholder according to the present invention because it has a tubular body which is open at both ends, can be produced using a core of a moulding or casting tool which is withdrawn from the said other open end of the body ie that end opposite to which the bulb is inserted in use.
  • a body is produced which tapers inwardly towards the end receiving the bulb in use, whereby the bulb can be accurately located relative to the bulbholder.
  • the removal of the core from the said other end enables the tool to be manufactured in one piece with projections thereon to define the opposed recesses and shoulders.
  • FIG. 1 is a longitudinal sectional view of a bulbholder according to the present invention.
  • FIG. 2 is a longitudinal sectional view of another type of bulbholder also according to the present invention.
  • the bulbholder is formed integrally with a reflector 1 (FIG. 1) (only partly shown) in a die-casting operation.
  • the bulbholder comprises a tubular body 2 integrally united with the reflector l by means of an intermediate, generally frus to-conical shell 3.
  • the tubular body 2 is open at both ends 4 and 5 thereof and is formed with a pair of diametrically opposed recesses 6 (only one shown) and a pair of diametrically opposed shoulders 7 (only one shown) therein so that the body can receive, in bayonet fashion, the body of a bulb 8 when inserted into the open end 4 of the body 2 so that diametrically opposed pins 9 on the body of the bulb 8 pass along the recesses 6 and engage the shoulders 7.
  • a recess 10 is formed externally of a rim 11 around the open end 4 of the body 2.
  • a centre contact 12 for the bulb 8 Internally of the body 2 there is carried a centre contact 12 for the bulb 8 and a compression spring 13 lodged between the centre contact 12 and the open end 5 of the body 2.
  • the end of the compression spring 13 adjacent the open end 5 has an integral turned back extension 14 which extends longitudinally of the body 2 away from the open end 5 and towards the open end 4 to terminate in a hook 15 which engages with the rim 11 in the vicinity of the recess 10.
  • the compression spring 13 is held against passage through the open end 5 of the body 2.
  • the compression spring 13 serves to urge the pins 9 on the bulb 8 against the shoulders 7 so as to retain the bulb 8 firmly within the tubular body 2.
  • the open end 5 of the body 2 can be die-cast using a tool core which is withdrawable from the open end 5 rather than from the open end 4 as has previously been the case.
  • This design permits the construction of the core to be considerably simplified due to the fact that it can be manufactured in a single piece.
  • the body so produced does not have any apertures in the side walls thereof so that sealing can be effected merely by a rubber end cap over the end 5.
  • the tool core withdrawal from the open end 5 means that the body 2 tapers inwardly towards the open end 4 thereof thus ensuring that the bulb 8 is accurately located within the body 2 since rocking of the bulb 8 about its pins 9 is limited due to tapering nature of the body 2 at the open end 4.
  • FIG. 2 of the drawings the bulbholder illustrated therein is similar to the bulbholder of FIG. 1 and similar parts are accorded the same reference numerals, primed.
  • the assembly of reflector l' and bulbholder 2' is not provided with the rim H and recess 10. Instead an aperture 16 is provided and a bent over and curved part 17 of extension 14' is secured to the bulbholder 2' by means of a rivet 18 passing through aperture 16.
  • the rivet 18 also serves to secure an earth return terminal 19 to the outside of the bulbholder.
  • the bulbholder of FIG. 2 is manufactured, and operates, in the same way as that described with reference to FIG. i.
  • a bulbholder comprising a tubular body open at both ends, opposed recesses and shoulders in said body for receiving, in bayonet fashion, a bulb when passed into said body via one of the open ends thereof, said tubular body being internally tapered inwardly towards said one of the open ends, a compression spring disposed in said body and arranged to urge said bulb, in use, against said shoulders, and an extension of said compression spring engaging the body so as to prevent said compression spring from passing through the other open end of said body.
  • a bulbholder as claimed in claim 1, wherein said extension comprises an outwardly turned end portion of the spring adjacent the said other open end of the body, said outwardly turned end portion being engaged with the body adjacent said open end thereof.
  • a bulbholder as claimed in claim 3 wherein said end portion terminates in an outwardly directed hook, said turned back end portion extending from the end of the spring adjacent said other open end of the body in a direction towards said one open end so that the hook engages a rim of the body around said one end thereof.

Landscapes

  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Clamps And Clips (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Connecting Device With Holders (AREA)
US424002A 1972-12-12 1973-12-12 Bulbholders Expired - Lifetime US3883734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5718072A GB1430245A (en) 1972-12-12 1972-12-12 Bulbholders

Publications (1)

Publication Number Publication Date
US3883734A true US3883734A (en) 1975-05-13

Family

ID=10478561

Family Applications (1)

Application Number Title Priority Date Filing Date
US424002A Expired - Lifetime US3883734A (en) 1972-12-12 1973-12-12 Bulbholders

Country Status (8)

Country Link
US (1) US3883734A (ja)
JP (1) JPS5025076A (ja)
AU (1) AU6332973A (ja)
DE (1) DE2361753A1 (ja)
ES (1) ES198699Y (ja)
FR (1) FR2210027B1 (ja)
GB (1) GB1430245A (ja)
IT (1) IT1008076B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363087A (en) * 1981-01-22 1982-12-07 Illinois Tool Works Inc. Mounting post for holding a lighted electrical pushbutton switch
US4746773A (en) * 1983-12-30 1988-05-24 Apollo Computer, Inc. Connector for automatically maintaining the integrity of a communications network
US5006751A (en) * 1989-08-11 1991-04-09 Marshall Rodney G Electric lamp and adapter socket therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554306C2 (de) * 1975-12-03 1982-04-01 Brökelmann, Jaeger & Busse GmbH & Co, 5760 Arnsberg Glühlampenfassung
GB8406782D0 (en) * 1984-03-15 1984-04-18 Bulgin & Co Plc A F Electrical connector

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US900426A (en) * 1906-06-21 1908-10-06 Benjamin Parks Rucker Shade and socket for incandescent lamps.
US959205A (en) * 1908-10-07 1910-05-24 Henry D Olier Jr Reflector attachment.
US2443743A (en) * 1945-07-27 1948-06-22 Bell & Howell Co Electrical socket
US3040285A (en) * 1960-05-23 1962-06-19 Watts Electric & Mfg Co Connector structure
US3206708A (en) * 1962-11-26 1965-09-14 United Carr Inc Snap-in j socket
US3569907A (en) * 1968-08-28 1971-03-09 Gen Electric Lamp base and socket
US3718892A (en) * 1969-09-25 1973-02-27 Itt Lamp socket

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2098466A5 (ja) * 1969-10-16 1972-03-10 Ibm France

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US900426A (en) * 1906-06-21 1908-10-06 Benjamin Parks Rucker Shade and socket for incandescent lamps.
US959205A (en) * 1908-10-07 1910-05-24 Henry D Olier Jr Reflector attachment.
US2443743A (en) * 1945-07-27 1948-06-22 Bell & Howell Co Electrical socket
US3040285A (en) * 1960-05-23 1962-06-19 Watts Electric & Mfg Co Connector structure
US3206708A (en) * 1962-11-26 1965-09-14 United Carr Inc Snap-in j socket
US3569907A (en) * 1968-08-28 1971-03-09 Gen Electric Lamp base and socket
US3718892A (en) * 1969-09-25 1973-02-27 Itt Lamp socket

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363087A (en) * 1981-01-22 1982-12-07 Illinois Tool Works Inc. Mounting post for holding a lighted electrical pushbutton switch
US4746773A (en) * 1983-12-30 1988-05-24 Apollo Computer, Inc. Connector for automatically maintaining the integrity of a communications network
US5006751A (en) * 1989-08-11 1991-04-09 Marshall Rodney G Electric lamp and adapter socket therefor

Also Published As

Publication number Publication date
IT1008076B (it) 1976-11-10
ES198699U (es) 1975-06-16
ES198699Y (es) 1975-12-01
FR2210027A1 (ja) 1974-07-05
DE2361753A1 (de) 1974-06-12
GB1430245A (en) 1976-03-31
JPS5025076A (ja) 1975-03-17
FR2210027B1 (ja) 1977-08-19
AU6332973A (en) 1975-06-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CARELLO LIGHTING PLC, A BRITISH COMPANY, ENGLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LUCAS ELECTRICAL LIMITED, A BRITISH COMPANY;REEL/FRAME:005789/0901

Effective date: 19910225