GB762217A - Improved electric lighting equipment - Google Patents

Improved electric lighting equipment

Info

Publication number
GB762217A
GB762217A GB910954A GB910954A GB762217A GB 762217 A GB762217 A GB 762217A GB 910954 A GB910954 A GB 910954A GB 910954 A GB910954 A GB 910954A GB 762217 A GB762217 A GB 762217A
Authority
GB
United Kingdom
Prior art keywords
lamp
switch
current
march
failure
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
GB910954A
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.)
EAST MIDLANDS ELECTRICITY BOAR
SYDNEY HUTCHINSON
Original Assignee
EAST MIDLANDS ELECTRICITY BOAR
SYDNEY HUTCHINSON
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 EAST MIDLANDS ELECTRICITY BOAR, SYDNEY HUTCHINSON filed Critical EAST MIDLANDS ELECTRICITY BOAR
Priority to GB910954A priority Critical patent/GB762217A/en
Publication of GB762217A publication Critical patent/GB762217A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/10—Circuits providing for substitution of the light source in case of its failure
    • H05B39/105—Circuits providing for substitution of the light source in case of its failure with a spare lamp in the circuit, and a possibility of shunting a failed lamp

Landscapes

  • Thermally Actuated Switches (AREA)

Abstract

762,217. Control systems for incandescent lamps. EAST MIDLANDS ELECTRICITY BOARD, and HUTCHINSON, S. March 7, 1955 [March 29, 1954], No. 9109/54. Class 38 (4). A standby street-lighting lamp L2 is automatically brought into circuit upon failure of a main lamp L1 by closure of contacts 4, 5 of a thermal switch TS controlled by the main lamp current. The switch comprises a bimetal strip carrying the moving contact 5 and normally distorted, so that the contacts 4, 5 are separated, by heat generated in a resistance heating coil 2 through which the current to the main lamp passes. A similar switch responsive to current flow through lamp L2 may switch in a further standby lamp upon failure of L2.
GB910954A 1954-03-29 1954-03-29 Improved electric lighting equipment Expired GB762217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB910954A GB762217A (en) 1954-03-29 1954-03-29 Improved electric lighting equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB910954A GB762217A (en) 1954-03-29 1954-03-29 Improved electric lighting equipment

Publications (1)

Publication Number Publication Date
GB762217A true GB762217A (en) 1956-11-28

Family

ID=9865538

Family Applications (1)

Application Number Title Priority Date Filing Date
GB910954A Expired GB762217A (en) 1954-03-29 1954-03-29 Improved electric lighting equipment

Country Status (1)

Country Link
GB (1) GB762217A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2296827A (en) * 1994-12-28 1996-07-10 Lawrence George Gray Safety standby adaptor or fitting
WO2004073359A1 (en) * 2003-02-13 2004-08-26 Andrew Leaf Fail-safe lighting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2296827A (en) * 1994-12-28 1996-07-10 Lawrence George Gray Safety standby adaptor or fitting
GB2296827B (en) * 1994-12-28 1999-06-23 Lawrence George Gray Safety standby adaptor or fitting for use with light bulbs
WO2004073359A1 (en) * 2003-02-13 2004-08-26 Andrew Leaf Fail-safe lighting system

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