GB648974A - Improvements in and relating to circular lighting fixtures - Google Patents

Improvements in and relating to circular lighting fixtures

Info

Publication number
GB648974A
GB648974A GB28136/47A GB2813647A GB648974A GB 648974 A GB648974 A GB 648974A GB 28136/47 A GB28136/47 A GB 28136/47A GB 2813647 A GB2813647 A GB 2813647A GB 648974 A GB648974 A GB 648974A
Authority
GB
United Kingdom
Prior art keywords
hub
lamp
contact
adaptor
engaging
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
Application number
GB28136/47A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB648974A publication Critical patent/GB648974A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F21S6/004—Lighting devices intended to be free-standing with a lamp housing in direct contact with the floor or ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
    • F21Y2103/33—Elongate light sources, e.g. fluorescent tubes curved annular

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

648,974. Lamp-holders. BRITISH THOMSON-HOUSTON CO., Ltd. Oct. 21, 1947, No. 28136. Convention date, Oct. 23, 1946. [Class 38 (i)] [Also in Group XI] In a lighting unit combining an annular fluorescent lamp 1 and an incandescent lamp 2, the holder 3 for the fluorescent lamp comprises a metal hub 5 and three radial arms, one arm 6 being of hollow rigid construction and having a socket 11 engaging the lamp contact pins, the other arms comprising resilient metal jaws 9, 10 engaging the periphery of the lamp. The lamp contact pins are disposed at 45 degrees to the plane of the lamp so that the jaws 9, 10 act to keep the pins in engagement with the socket 11. An adaptor 4 secures the unit to the usual threaded power socket for receiving an incandescent lamp and is attached to the hub 5 by a swivel joint comprising a collar 13 journalled on a block 14 of insulating material secured to the bottom of the hub and having two interior pins 15 for engagement with bayonet slots 16 on the adaptor. The top of the adaptor has a central recess 21 containing a contact clip 20 engaging with a contact pin 22 protruding from the hub and an annular recess 25 containing a contact clip 24 engaging with a ring-shaped contact 26 protruding from the hub. A C-shaped corrugated metal strip 28 secured in the annular recess 25 presses on the ring contact 26 to lock the pin and slot connection between the adaptor and the rotatable collar 13. The adaptor may be connected by a permanent or bayonet type joint to the hub. The incandescent lamp socket comprises a threaded shell 30 insulated from the metal hub by a sleeve 31 and secured by rivets 33, 35 to an insulated disc 32 bolted to the hub. The rivet 33 constitutes the central contact being insulated from the shell by an upper insulated disc 34, and the rivet 35 serves as the connection to the shell.
GB28136/47A 1946-10-23 1947-10-21 Improvements in and relating to circular lighting fixtures Expired GB648974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US648974XA 1946-10-23 1946-10-23

Publications (1)

Publication Number Publication Date
GB648974A true GB648974A (en) 1951-01-17

Family

ID=22058941

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28136/47A Expired GB648974A (en) 1946-10-23 1947-10-21 Improvements in and relating to circular lighting fixtures

Country Status (1)

Country Link
GB (1) GB648974A (en)

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