GB664963A - Improvements in or relating to electromagnetic relays - Google Patents

Improvements in or relating to electromagnetic relays

Info

Publication number
GB664963A
GB664963A GB1607749A GB1607749A GB664963A GB 664963 A GB664963 A GB 664963A GB 1607749 A GB1607749 A GB 1607749A GB 1607749 A GB1607749 A GB 1607749A GB 664963 A GB664963 A GB 664963A
Authority
GB
United Kingdom
Prior art keywords
relay
resistance
june
bridge
operate
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
GB1607749A
Inventor
Leonard William Descarri Sharp
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB1607749A priority Critical patent/GB664963A/en
Publication of GB664963A publication Critical patent/GB664963A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
    • H01H43/308—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the change of electrical properties, e.g. thermistors

Landscapes

  • Control Of Resistance Heating (AREA)
  • Keying Circuit Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

664,963. Electro-magnetic relays. PLESSEY. CO., Ltd. June 16, 1950. [June 16, 1949] No. 16077/49. Class 38 (v). The time of operation or release of a relay is controlled by associating the relay with a non-linear resistance L3 which forms one arm of a Wheatstone bridge arrangement the other three arms of which are constituted by ordinary resistances R3, R4; R5. In the form shown, wherein momentary closure of a switch' S causes the relay RL to operate for a predetermined time, closure of the switch S causes the relay RL to operate and close a maintaining contact H which places the battery BA across the points 3, 4 of the bridge. The resistance L3 heats up till the bridge becomes balanced or nearly so whereupon the current' through the relay RL is so reduced 'that it releases. The resistance L3 may be a metal filament or carbon filament lamp or a barretter.
GB1607749A 1949-06-16 1949-06-16 Improvements in or relating to electromagnetic relays Expired GB664963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1607749A GB664963A (en) 1949-06-16 1949-06-16 Improvements in or relating to electromagnetic relays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1607749A GB664963A (en) 1949-06-16 1949-06-16 Improvements in or relating to electromagnetic relays

Publications (1)

Publication Number Publication Date
GB664963A true GB664963A (en) 1952-01-16

Family

ID=10070735

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1607749A Expired GB664963A (en) 1949-06-16 1949-06-16 Improvements in or relating to electromagnetic relays

Country Status (1)

Country Link
GB (1) GB664963A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105175A (en) * 1959-05-26 1963-09-24 Siliani Pier Luigi Self-adjusting condition responsive relay circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105175A (en) * 1959-05-26 1963-09-24 Siliani Pier Luigi Self-adjusting condition responsive relay circuit

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