US2784355A - Time-lag relay circuit - Google Patents

Time-lag relay circuit Download PDF

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Publication number
US2784355A
US2784355A US381928A US38192853A US2784355A US 2784355 A US2784355 A US 2784355A US 381928 A US381928 A US 381928A US 38192853 A US38192853 A US 38192853A US 2784355 A US2784355 A US 2784355A
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United States
Prior art keywords
relay
time
heater element
core
switching
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 - Lifetime
Application number
US381928A
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English (en)
Inventor
Harold Van Suchtelen
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2784355A publication Critical patent/US2784355A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/26—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil having thermo-sensitive input
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/58—Thermally-sensitive members actuated due to thermally controlled change of magnetic permeability
    • 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
    • H01H43/309—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 magnetic properties

Definitions

  • the invention relates to a relay circuit comprising the chain of two or more time-lag relays.
  • a time-lag relay is to be understood to mean herein a relay, the switching mechanism of which becomes operative some time after the energizing condition of the relay has been changed.
  • the term chain is to be understood to mean that the switching circuit of one relay is connected to the energizing circuit of the next-following relay, so that the change-over of the first relay varies the energizing condition of the last-mentioned relay.
  • the invention has for its object to utilize particularly the time interval between the instant when a switching cycle of the chain is initiated by a variation of the energizing condition of the first relay of the chain, produced by an independent excitation, i. e. an excitation not associated with the mechanism of the chain circuit, and the instant when the last relay of the chain changes over, for example, in order to derive a variation of the energizing condition of, for instance, a signalling apparatus from this change-over.
  • It is particularly suitable for household purposes, in which after a predetermined time after a load, for example, an electric washing machine, has been switched in, a signal, for instance, an alarm signal is produced and/or the load is switched out.
  • time-lag relays of single switching operation in which the switching cycle of the chain is initiated by varying the energizing condition of at least the first relay of the chain by excitation from without, the initial energizing condition of this relay being restored automatically, simu taneously with, or before the occurrence of, the variation of the energizing condition of the last relay of the chain produced by the mechanism of the chain.
  • the term single switching operation is to be understood to mean herein that after the variation in the energizing condition of the relay, the switching circuit changes over, but that after the initial energizing condition has been restored it does not return into its initial position.
  • thermal relays of a type comprising a ferromagnetic core, in which in known manner, when the Curie temperature of the core is exceeded, an armature falls oil and moves to such a distance from the core that it is no longer lifted when the core returns to the initial temperature.
  • thermal relays 1, 2 and 3 comprise heating windings 4, 5 and 6 and ferromagnetic cores 7, 8 and 9, which cooperate with armatures 10, 11 and 12 of permanent magnetic material, supported by springs 13, 14 and 15.
  • the lower terminals of the heating windings 4, 5 and 6 are connected to one terminal 17 of a source of voltage and the spring 13 of the first relay is connected to the other terminal 18 of said source.
  • a switching cycle is initiated, for example, simultaneously with the actuation of a load, by hand or by another independent operation, since the armatures 10, 11 and 12 are simultaneously urged against the cores 7, S and 9, where they remain, due to the retentivity of said armatures.
  • the springs 13, 14 and 15 thus engage contacts 19, 2t) and 21, connected to the upper terminals of the heating windings 4-, 5 and 6.
  • a current from the supply source 17, 18 flows by way of the spring 13 and the contact 1') through the heating winding 4.
  • This condition may, if desired, be indicated by a signalling lamp 22..
  • the core 7 assumes such a temperature, owing to the heating winding 4, that the Curie temperature of the core material is exceeded, so that it becomes non-magnetic and the armature it ⁇ no longer engages the core "7.
  • the spring 13 then engages a contact 26, connected to the spring 14, so that the heating winding 5 of the next following relay 2 is energized from the source 17, 13 via the switching elements 13, 26, 14, 20.
  • the energization may, if desired, be indicated by a signalling lamp 23.
  • the heating winding 4 of the relay 1 is switched off simultaneously, since the spring 13 and the contact 19 are disengaged, while the spring force of the spring 13 and the switching path of the armature 10 are chosen to be such that, after cooling of the core 7, which thus regains its ferromagnetism, the armature it) remains too far from the core 7 to be attracted automatically, which means that the relay 1 and also the relays 2 and 3 exhibit a single switching operation.
  • the relay 2 falls off after a certain time lag, which need, of course, not be equal to that of relay 1.
  • the spring 14 engages a contact 27, connected to the spring 15, so that the heating winding of relay 3 is energized. This energization may be indicated by means of a signalling lamp 24.
  • an alarm device for example, a clock or a signalling lamp 39, is energized through a contact 28, to mark the end of the switching cycle.
  • a relay may be energized, with the aid of which the load switched in simultaneously with the initiation of the switching cycle may be switched off.
  • This relay may, if desired, be economized by providing the relay 3 with a second interruptor (not shown), through which said load is switched off.
  • the relays Since the relays exhibit a single switching operation and switch themselves out, adequate time is available for cooling the core 7 before the end of the switching cycle. Thus the device is immediately suitable for reactuation; it does not start a new switching cycle spontaneously. Since the cooling time frequently exceeds the heating time, use is preferably made, in the case of relays of the said type, of at least three relays, so that the core of relay 1 may be cooled when relays 2 and 3 are not yet actuated. This applies particularly to the case in which the final temperature which the core would assume by way of the heating winding, if it were not switched out, materially exceeds the Curie temperature. In general the cooling of relay 1 must start atthe'latest at the instant when the heating circuitof relay 3' is switched in.
  • the invention is not confined to the use of thema netic relays shown in the drawing, although these relays are particularly suitable for the desired purpose.
  • use may be made of other relays of'single switching operation for example, the reiays in which the time-lag is obtained by the delayed displacement of, for example, a liquid column, in conjunction withthe use of a snap switch or those relays operatingon the thermal expansion of a bi-metal, in conjunction also with the use of a snap switch.
  • a snap switch use may be made of a ferromagnetic relay comprising a magnet coil and an armature having a comparatively large switching path.
  • a variation in the energizing condition will provide a delayed operation thereof, and the restoring of the initial energizing condition requires a period of time before the relay can again operate under the initial conditions.
  • a relay system comprising a chain of interconnected relay circuits each including a thermal relay of a type having predetermined energization and deenergization operational time lags and comprising a heater element, a core of magnetic material in operative relation to said heater element and a switching element adapted to switch from one operative condition to another under the influence of the temperature of said heater element, each said switching element being adapted to switch from said one operative condition to said other operative condition when the temperature of its associated heater element exceeds a predetermined value and subsequent to said predetermined energization time lag and to remain at said other operative condition for at least said predetermined deenergization time lag when the temperature of its associated heater element is below said predetermined value, said predetermined temperature value of each said heater element being the Curie temperature of its associated core, means for applying a supply voltage betweenthe first switching element and the first heater element of said relay circuits, means actuated by said first switching element in said one operative condition for applying said supply voltage to said first heater element thereby to energize said
  • a relay system comprising a chain of interconnected reiay circuits each including a thermal relay of a type having predetermined energization and deenergizatiou operational time lags and Comprising a heater element, a core of magnetic material in operative relation to said heater element and a switchingelement adapted to switch from one operative condition to another under the influence of the temperature of said heater element comprising an armature of permanent magnetic material in cooperative relation with its associated core, each said switchingeiement being adapted to switch from saidone operative condition to said other operative condition when thetemperature of its .associatedheater ele ment exceeds a predetermined value and subsequent to said predetermined energization time lag and to remain at said other operative condition for at least said predetermined deenergization; time lag when the temperature of its associated heater element is below said predetermined value, said predetermined temperature value of each said heater element being the Curie temperature of its associated core, means for applying a supply voltage between the first switching element and the first heater element of
  • a relay system comprising a chain of three interconnected relay circuits each including a thermal relay of a type having predetermined energization and dcenergization operational time lags and comprising a heater element, a core of magnetic material in operative relation to said heater element and a switching element adapted to switch from one operative condition to another under the influence of the temperature of said heater element and comprising an armature of permanent magnetic material in cooperative relation with its associated core, each said switching element being adapted to switch from said one operative condition to said other operative condition when the temperature of its associated heater element exceeds a predetermined value and subsequent to said predetermined energization time lag and to remain at said other operative condition for at least said predetermined deenergization time lag when the temperature of its associated heater element is below said predetermined value, said predetermined temperature value of each said heater element being the Curie temperature of its associated core, means for applying a supply voltage between the first switching element and the first heater element of said relay circuits, means actuated by said first switching element in said

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Relay Circuits (AREA)
  • Control Of Resistance Heating (AREA)
  • Laminated Bodies (AREA)
  • Thermally Actuated Switches (AREA)
US381928A 1952-10-03 1953-09-23 Time-lag relay circuit Expired - Lifetime US2784355A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL749655X 1952-10-03

Publications (1)

Publication Number Publication Date
US2784355A true US2784355A (en) 1957-03-05

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ID=19822906

Family Applications (1)

Application Number Title Priority Date Filing Date
US381928A Expired - Lifetime US2784355A (en) 1952-10-03 1953-09-23 Time-lag relay circuit

Country Status (5)

Country Link
US (1) US2784355A (enrdf_load_stackoverflow)
DE (1) DE939038C (enrdf_load_stackoverflow)
FR (1) FR1084521A (enrdf_load_stackoverflow)
GB (1) GB749655A (enrdf_load_stackoverflow)
NL (2) NL172911C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902682A (en) * 1956-08-27 1959-09-01 Rca Corp Flammable vapor detector
US2948851A (en) * 1957-06-25 1960-08-09 Ward Miller Electric control for timer
US3059229A (en) * 1956-10-01 1962-10-16 Sperry Rand Corp Temperature responsive indicating system
US20170153022A1 (en) * 2014-06-20 2017-06-01 3278470 Nova Scotia Limited Electrode water heater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287189B (de) * 1959-06-29 1969-01-16 Monsanto Co Zeitprogrammgeber fuer ein Steuerorgan, insbesondere bei einer Garnverzugsvorrichtung zur Einfuehrung von Noppen in Garne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE560747C (de) * 1931-03-04 1932-10-06 Alfred Beyer Elektrische Wanderschrift-Anlage
US1904929A (en) * 1931-09-03 1933-04-18 Associated Electric Lab Inc Relay system
US2075841A (en) * 1934-07-26 1937-04-06 Werthelmer Adolf Electric advertising device
US2269162A (en) * 1940-01-06 1942-01-06 Gen Electric Timing device
US2322069A (en) * 1942-04-18 1943-06-15 Gen Electric Relay
US2590926A (en) * 1950-02-07 1952-04-01 Kellogg Switchboard & Supply Multirelay electric timer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE826774C (de) * 1950-02-21 1952-01-03 Stotz Kontakt Gmbh Elektromagnetisches Relais mit thermischer Wirkung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE560747C (de) * 1931-03-04 1932-10-06 Alfred Beyer Elektrische Wanderschrift-Anlage
US1904929A (en) * 1931-09-03 1933-04-18 Associated Electric Lab Inc Relay system
US2075841A (en) * 1934-07-26 1937-04-06 Werthelmer Adolf Electric advertising device
US2269162A (en) * 1940-01-06 1942-01-06 Gen Electric Timing device
US2322069A (en) * 1942-04-18 1943-06-15 Gen Electric Relay
US2590926A (en) * 1950-02-07 1952-04-01 Kellogg Switchboard & Supply Multirelay electric timer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902682A (en) * 1956-08-27 1959-09-01 Rca Corp Flammable vapor detector
US3059229A (en) * 1956-10-01 1962-10-16 Sperry Rand Corp Temperature responsive indicating system
US2948851A (en) * 1957-06-25 1960-08-09 Ward Miller Electric control for timer
US20170153022A1 (en) * 2014-06-20 2017-06-01 3278470 Nova Scotia Limited Electrode water heater

Also Published As

Publication number Publication date
FR1084521A (fr) 1955-01-20
DE939038C (de) 1956-02-16
NL85500C (enrdf_load_stackoverflow)
GB749655A (en) 1956-05-30
NL172911C (nl)

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