GB567222A - Improvements in or relating to time controlled switching arrangements - Google Patents
Improvements in or relating to time controlled switching arrangementsInfo
- 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
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.
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)
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)
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 |
-
0
- BE BE467471D patent/BE467471A/xx unknown
- NL NL136888D patent/NL136888C/xx active
-
1943
- 1943-07-30 GB GB18578/44A patent/GB567225A/en not_active Expired
- 1943-07-30 GB GB12394/43A patent/GB567222A/en not_active Expired
-
1944
- 1944-07-17 US US545329A patent/US2471457A/en not_active Expired - Lifetime
-
1946
- 1946-01-14 CH CH259933D patent/CH259933A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CH259933A (en) | 1949-02-15 |
NL136888C (en) | |
US2471457A (en) | 1949-05-31 |
GB567225A (en) | 1945-02-02 |
BE467471A (en) |
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