US3800261A - Device for regulating the current strength for a thermal relay - Google Patents

Device for regulating the current strength for a thermal relay Download PDF

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Publication number
US3800261A
US3800261A US00323675A US32367573A US3800261A US 3800261 A US3800261 A US 3800261A US 00323675 A US00323675 A US 00323675A US 32367573 A US32367573 A US 32367573A US 3800261 A US3800261 A US 3800261A
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US
United States
Prior art keywords
lever
transmission mechanism
thermoelements
regulating
triggering
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
US00323675A
Other languages
English (en)
Inventor
C Clement
C Blanchard
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Application granted granted Critical
Publication of US3800261A publication Critical patent/US3800261A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/162—Electrothermal mechanisms with bimetal element with compensation for ambient temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H2071/7454—Adjusting only the electrothermal mechanism with adjustable axis of transmission lever between bimetal element and trip lever

Definitions

  • a variable-ratio transmission is established between the heat-sensitive component and the triggering component by means of a transmission lever whose point of application is mobile; applicable to thermal relays associated with contactors.
  • the invention relates to a device for regulating thecurrent strength for thermal relays comprising a mechanism for transmitting the movement coming from the thermoelements to the lock triggering the contacts, a regulating device making it possible to adjust the gap which separates said thermoelements from the transmission mechanism, and a two-metal compensator capable of modifying the triggering stroke as a function of the ambient'temperature.
  • thermal relays designed to be associated with contactors in order to ensure the safe working of instruments which consume electric power from the circuit in which they are connected.
  • a thermal relay capable of being fitted with the present device is, e.g., shown in the patent application made by the Applicant and bearing the title Setting and Triggering device for Thermal Relay and filed on the same day.
  • thermoelements conforming to the instruments mentioned above wherein the movement ofa component connected to the thermoelements is in the same direction as that which is imparted to the triggering lock or to the mobile part which carries it.
  • the invention consequently proposes to provide a triggering device wherein the sensitivity is modified at the same time as the value of the triggering current strength selected.
  • the two-metal compensator takes the form of a triggering lever whose first arm is equipped with the lock and whose second arm is subjected to the action of a transmission mechanism whose position is altered by a regulating device which simultaneously separates the transmission mechanism from the thermoelem ents and moves the point of application of the movement of the transmission mechanism on the second arm.
  • the triggering lever has two branches positioned on either side of its pivot axis and the transmission mechanism is a pivotal mobile part which moves away from or approaches the thermoelements when it is moved parallel to the lever.
  • FIG. 1 shows an embodiment wherein the sensitivity decreases with the triggering current strength
  • FIG. 2 shows a similar embodiment, but where the sensitivityincreases with the triggering current strength
  • FIGS. 3 and 4 show two variants.
  • the device covered by the invention can be likened to a variable-ratio transmission positioned between a mobile component 1, whose movements are linked to those of thermoelements (not shown), and a triggering slide 10 which will open safety contacts under the influence ofa spring 15 when the lock 16 which holds it via the lip 12 moves in the direction F
  • the transmission device consists notably of a triggering lever 8 which has two arms 9 and I1 positioned on either side of an axis of rotation 7.
  • the lock 16 is carried by the end ofthe arm 11.
  • This lever consists in reality of a two-metal blade which can assume a certain camber as a function of the ambient temperature and consequently acts as a compensator.
  • the lever 6 which is the regulating component of the device comprises a pivot which, in the example of embodiment, is merged with the axis 7 on which the lever 8 is mounted.
  • This pivot could, however, be positioned elsewhere without the working being otherwise modified.
  • the free end of the regulating component 6 is equipped with a pointer 13 which is positioned opposite a scale 14, while at a point situated between this end and the pivot axis there is a second pivot 5 on which a transmission lever 2, 3, 4 is hung.
  • the latter is made up of three portions, one 2 of which extends to opposite the mobile component 1.
  • This mobile component is as stated above, connected to the thermoelements whose deformation depends on the strength of the current which heats them.
  • the connection in question which is not covered by the patent, may consist of a differential detector suitable to react to a phase imbalance. The device is, however, still valid if the mobile component 1 is itself the end of a thermoelement and it will hereinafter be designated by this term.
  • a second portion 3 of the lever 2 carries at the end a thrust finger 4 which is in contact with the arm 9 of the compensation thermoelement 8.
  • the purchase of the finger 4 is situated at a distance b from the axis of ratation 7.
  • thermoelements l When the temperature of the thermoelements l is high enough, their deformation causes a reduction of the distance a which separates them from the portion 2 of the transmission lever 2, 3, 4 in the direction F A further increase in temperature will cause the thermoelements to bear against the portion 2 of the transmission lever which'will be swung by the finger 4 against the triggering lever and cause it to pivot in the direction F until such time as the lock 16 releases the slide 10.
  • the regulating lever 6 is subjected to rotation whichwill position its pointer opposite another point on the scale and cause a movement of the transmission lever in the direction F
  • the distance a will therefore have increased, and the point of application of the finger 4 will also have been moved so that the length I; of the lever will have become longer.
  • thermoelements In this way, it would be possible to position between thermoelements and a triggering lever 8, a mobile push-rod arranged in a slanting position whose lateral adjustment 14' would simultaneously modify the distance separating one of its ends from the thermoelements, while the other end would come opposite a variable point belonging to the regulating lever, see FIG. 3.
  • tion would consist of putting on the mobile part 1 connected with the movement of the thermoelements, a lever whose general direction would be fairly slanting in relation to the direction of movement of the mobile part and whose end would, by a rotation corresponding to the current strength adjustment, come opposite a variable point on an intermediate lever 8" moving in the same direction, see FIG. 4.
  • Device for regulating the current strength for a thermal relay comprising a mechanism transmitting the movement coming from the deformation of the thermoelements to the contact-triggering lock a regulating device making it possible to adjust the gap which separates said thermoelements from the transmission mechanism, and a two-metal compensator capable of modi-.
  • the two-metal compensator takes the form of a lever 8 whose first arm 11 is fitted with a lock 16 and whose second arm 9 is subjected to the action of a transmission mechanism 2, 3 whose position is modified by a regulating device 6 which simultaneously separates the transmission mechanism 2, 3 from the thermoelements 1 and moves the point of application 4 of the movement of the transmission mechanism on the second arm 9.
  • the transmission mechanism consists of an orientable lever which can be moved in translation and acts as a push-rod 20-30 respectively between the thermoelements I and a variable point on a triggering lever 88" respectively.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Relay Circuits (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • General Induction Heating (AREA)
  • Breakers (AREA)
US00323675A 1972-01-14 1973-01-15 Device for regulating the current strength for a thermal relay Expired - Lifetime US3800261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7201369A FR2167438B1 (de) 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
US3800261A true US3800261A (en) 1974-03-26

Family

ID=9091980

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323675A Expired - Lifetime US3800261A (en) 1972-01-14 1973-01-15 Device for regulating the current strength for a thermal relay

Country Status (14)

Country Link
US (1) US3800261A (de)
AT (1) AT331339B (de)
BE (1) BE793834A (de)
BR (1) BR7300227D0 (de)
CA (1) CA970006A (de)
CH (1) CH567798A5 (de)
DK (1) DK141566C (de)
ES (1) ES410615A1 (de)
FR (1) FR2167438B1 (de)
GB (1) GB1413693A (de)
IT (1) IT978172B (de)
NL (1) NL7300428A (de)
NO (1) NO136946C (de)
SE (1) SE388072B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4623536A (en) * 1985-06-13 1986-11-18 Church & Dwight Co., Inc. Sodium bicarbonate containing toothpaste

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776352A (en) * 1953-02-19 1957-01-01 Sunvic Controls Ltd Electric snap-action switch devices
US2784278A (en) * 1954-02-01 1957-03-05 Fed Electric Prod Co Automatic circuit breaker with calibration provisions
US3155795A (en) * 1962-08-24 1964-11-03 Gen Electric Circuit breaker trip device with ambient compensation and adjusting means therefor
US3484728A (en) * 1967-08-21 1969-12-16 Ite Imperial Corp Adjustable strength electro-magnet with constant air gap
US3523263A (en) * 1968-01-12 1970-08-04 Robertshaw Controls Co Electromagnetic apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776352A (en) * 1953-02-19 1957-01-01 Sunvic Controls Ltd Electric snap-action switch devices
US2784278A (en) * 1954-02-01 1957-03-05 Fed Electric Prod Co Automatic circuit breaker with calibration provisions
US3155795A (en) * 1962-08-24 1964-11-03 Gen Electric Circuit breaker trip device with ambient compensation and adjusting means therefor
US3484728A (en) * 1967-08-21 1969-12-16 Ite Imperial Corp Adjustable strength electro-magnet with constant air gap
US3523263A (en) * 1968-01-12 1970-08-04 Robertshaw Controls Co Electromagnetic apparatus

Also Published As

Publication number Publication date
CA970006A (en) 1975-06-24
GB1413693A (en) 1975-11-12
CH567798A5 (de) 1975-10-15
FR2167438B1 (de) 1976-10-29
ES410615A1 (es) 1976-01-01
DK141566C (da) 1980-10-06
ATA23573A (de) 1975-11-15
NO136946C (no) 1977-11-30
IT978172B (it) 1974-09-20
AT331339B (de) 1976-08-10
DK141566B (da) 1980-04-21
DE2300746B2 (de) 1975-12-04
BE793834A (fr) 1973-05-02
SE388072B (sv) 1976-09-20
FR2167438A1 (de) 1973-08-24
NL7300428A (de) 1973-07-17
NO136946B (no) 1977-08-22
BR7300227D0 (pt) 1973-10-09
DE2300746A1 (de) 1973-07-19

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