GB567222A - Improvements in or relating to time controlled switching arrangements - Google Patents

Improvements in or relating to time controlled switching arrangements

Info

Publication number
GB567222A
GB567222A GB12394/43A GB1239443A GB567222A GB 567222 A GB567222 A GB 567222A GB 12394/43 A GB12394/43 A GB 12394/43A GB 1239443 A GB1239443 A GB 1239443A GB 567222 A GB567222 A GB 567222A
Authority
GB
United Kingdom
Prior art keywords
thermistor
heated
heater
resistance
time lag
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
GB12394/43A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB567222A publication Critical patent/GB567222A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Temperature (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

567,222. Electromagnetic switches. STANDARD TELEPHONES & CABLES, Ltd., and SHEPARD, S. C. July 30, 1943, No. '12394. [Class 38 (v)] An electromagnetic relay is associated with an indirectly - heated thermistor, the heating current of which is adjustable, thereby providing an adjustable time lag. In the arrangement of Fig. 1, the supply is connected to the points X, Y and the heater r1 of an indirectly-heated thermistor T1 is heated by current derived from an adjustable part of a resistance R6. The thermistor has a negative temperature coefficient so that after a time lag its resistance R1 becomes sufficiently reduced for the relay A to operate. In a modification, Fig. 2 (not shown), giving a greater time lag, the heater r1 is in series with the resistance of a second thermistor, the heater of which is adjustably heated. This second thermistor must heat up before the full heating current can flow to the first thermistor. Additional thermistors may be added in a similar way. Specifications 487,563 and 557,707 are referred to.
GB12394/43A 1943-07-30 1943-07-30 Improvements in or relating to time controlled switching arrangements Expired GB567222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB259933X 1943-07-30

Publications (1)

Publication Number Publication Date
GB567222A true GB567222A (en) 1945-02-02

Family

ID=10236617

Family Applications (2)

Application Number Title Priority Date Filing Date
GB18578/44A Expired GB567225A (en) 1943-07-30 1943-07-30 Improvements in or relating to circuit arrangements for periodically operating an electromagnetic relay
GB12394/43A Expired GB567222A (en) 1943-07-30 1943-07-30 Improvements in or relating to time controlled switching arrangements

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB18578/44A Expired GB567225A (en) 1943-07-30 1943-07-30 Improvements in or relating to circuit arrangements for periodically operating an electromagnetic relay

Country Status (5)

Country Link
US (1) US2471457A (en)
BE (1) BE467471A (en)
CH (1) CH259933A (en)
GB (2) GB567225A (en)
NL (1) NL136888C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547750A (en) * 1947-04-03 1951-04-03 Barber Colman Co Programmed temperature control using a wheatstone bridge
US2629005A (en) * 1951-02-09 1953-02-17 William E Engelhard Switch control mechanism
US2926299A (en) * 1954-04-21 1960-02-23 Mcdermott Controls Inc Electrical instrument with thermistor sensing element
US2885604A (en) * 1956-05-24 1959-05-05 Bell Telephone Labor Inc Temperature compensated relay control circuit
US2886246A (en) * 1956-06-13 1959-05-12 Vapor Heating Corp Thermostatically regulated temperature control system
US3259809A (en) * 1962-02-06 1966-07-05 Hugh R Carlon Low-frequency switching with thermostatic delay relays
US3334278A (en) * 1964-06-03 1967-08-01 Wagner Electric Corp Delay or oscillating circuits
US20050018748A1 (en) * 2003-07-24 2005-01-27 Ringermacher Harry Israel Actively quenched lamp, infrared thermography imaging system, and method for actively controlling flash duration

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE397158C (en) * 1923-10-17 1924-06-14 Starkstrom Appbau G M B H Electromagnet attracting with a delay
US2034881A (en) * 1933-05-26 1936-03-24 Bell Telephone Labor Inc Electromagnetic relay circuits
US2148491A (en) * 1933-12-01 1939-02-28 Foxboro Co Deoscillator
DE640150C (en) * 1934-05-26 1936-12-23 Aeg Electrical switching device for the automatic periodic opening and closing of a circuit by a relay whose coil is connected in series with a main resistor with a negative temperature coefficient
US2112542A (en) * 1936-01-17 1938-03-29 Bell Telephone Labor Inc Electromagnet and controlling circuits therefor
US2244058A (en) * 1939-10-31 1941-06-03 American Telephone & Telegraph Interrupter circuit
US2304613A (en) * 1941-04-12 1942-12-08 Bell Telephone Labor Inc Delayed operation circuit
US2318358A (en) * 1942-02-16 1943-05-04 Gen Electric Condition control system
GB557707A (en) * 1942-05-28 1943-12-01 Standard Telephones Cables Ltd Improvements in or relating to relay timing arrangements

Also Published As

Publication number Publication date
US2471457A (en) 1949-05-31
BE467471A (en)
CH259933A (en) 1949-02-15
NL136888C (en)
GB567225A (en) 1945-02-02

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