GB892318A - Improvements in or relating to bimetallic electrical switches - Google Patents

Improvements in or relating to bimetallic electrical switches

Info

Publication number
GB892318A
GB892318A GB26172/58A GB2617258A GB892318A GB 892318 A GB892318 A GB 892318A GB 26172/58 A GB26172/58 A GB 26172/58A GB 2617258 A GB2617258 A GB 2617258A GB 892318 A GB892318 A GB 892318A
Authority
GB
United Kingdom
Prior art keywords
strip
switch
time lag
heater
deflect
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
GB26172/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB892318A publication Critical patent/GB892318A/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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/06—Starting switches thermal only

Landscapes

  • Thermally Actuated Switches (AREA)

Abstract

892,318. Thermal switches. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 14, 1958 [Aug. 17, 1957; Dec. 4, 1957], No. 26172/58. Class 38 (5). [Also in Group XXXV] A switch for starting gas or vapour discharge tubes comprises two bimetallic strips 14, 17, arranged to deflect in the same direction when a plate-shaped heater 15, whose resistance decreases with increase of applied voltage, is energized on closure of a main switch 26. The presence of a metal strip 16 produces a thermal time lag such that contacts 20, 21 are closed by deflection of the strip 14 and subsequently opened by the strip 17, these operations being repeated if necessary until the tube strikes. In a modification (Fig. 4) the time lag is produced by a bimetal strip 36 interposed between a heater 37 and another bimetal strip 42, the strips having their high expansion sides in contact so that they deflect in opposite directions. Simpler versions of the switch have only one bimetal strip, with no ambient temperature compensation and no time lag device (Figs. 1 and 2, not shown). The switch may be arranged in a sealed casing and a spark-absorbing capacitor 29 may be arranged across the contacts. The heater may engage the high expansion side of the bimetallic element or the low expansion side. Specification 292,110 is referred to.
GB26172/58A 1957-08-17 1958-08-14 Improvements in or relating to bimetallic electrical switches Expired GB892318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL892318X 1957-08-17

Publications (1)

Publication Number Publication Date
GB892318A true GB892318A (en) 1962-03-28

Family

ID=19855939

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26172/58A Expired GB892318A (en) 1957-08-17 1958-08-14 Improvements in or relating to bimetallic electrical switches

Country Status (1)

Country Link
GB (1) GB892318A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805022A (en) * 1972-10-10 1974-04-16 Texas Instruments Inc Semiconducting threshold heaters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805022A (en) * 1972-10-10 1974-04-16 Texas Instruments Inc Semiconducting threshold heaters

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