EP3644339B1 - Appareil de coupure d'un courant électrique - Google Patents

Appareil de coupure d'un courant électrique Download PDF

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Publication number
EP3644339B1
EP3644339B1 EP19204397.4A EP19204397A EP3644339B1 EP 3644339 B1 EP3644339 B1 EP 3644339B1 EP 19204397 A EP19204397 A EP 19204397A EP 3644339 B1 EP3644339 B1 EP 3644339B1
Authority
EP
European Patent Office
Prior art keywords
shaft
interrupting
opening
head
movable
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.)
Active
Application number
EP19204397.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3644339A1 (fr
Inventor
Patrick Comtois
Patrick Larcher
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP3644339A1 publication Critical patent/EP3644339A1/fr
Application granted granted Critical
Publication of EP3644339B1 publication Critical patent/EP3644339B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0228—Mounting or assembling the different parts of the circuit breaker having provisions for interchangeable or replaceable parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/54—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts
    • H01H3/58—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts using friction, toothed, or other mechanical clutch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/002—Details of electromagnetic relays particular to three-phase electromagnetic relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/041—Details concerning assembly of relays
    • H01H50/042—Different parts are assembled by insertion without extra mounting facilities like screws, in an isolated mounting part, e.g. stack mounting on a coil-support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/041—Details concerning assembly of relays
    • H01H50/045—Details particular to contactors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/541—Auxiliary contact devices
    • H01H50/545—Self-contained, easily replaceable microswitches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
    • H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/24—Interlocking, locking, or latching mechanisms for interlocking two or more parts of the mechanism for operating contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H2009/0088—Details of rotatable shafts common to more than one pole or switch unit
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0235—Contacts and the arc extinguishing space inside individual separate cases, which are positioned inside the housing of the circuit breaker

Definitions

  • the present invention relates to an apparatus for cutting an electric current.
  • the patent EP 2 936 534 B1 describes an apparatus for breaking an electric current, such as a contactor, comprising a plurality of breaking elements with separable contacts, each breaking element being associated with a phase of the electric current.
  • each breaking element comprises fixed electrical contacts and a movable electrical contact movable between open and closed positions to, respectively, prevent or allow the flow of electric current.
  • an actuator is coupled to a movable pallet in translation to which the movable contacts are hooked by means of a connection interface.
  • each movable contact is carried by a contact carrier on which is fixed a screw head projecting outwardly and being hooked to the pallet by means of a fork integral with the pallet.
  • connection interface connecting the movable contacts to the movable pallet is improved.
  • connection and the locking between the movable pallet and each movable part are made by rotating the shaft and without having recourse to a translational movement liable to be hampered by equipment or obstacles located near it. the switching device.
  • the figure 1 represents an apparatus for cutting an electric current 1, such as a contactor.
  • the switching device 1 is particularly suitable for interrupting or, alternately, allowing the flow of an electric current, for example in response to a control signal.
  • the switching device 1 is intended to be connected in an electrical distribution installation.
  • the device 1 comprises a cut-off block 2, a connection interface 3, an actuation block 4 and upstream and downstream electrical connection pads 5.
  • the cut-off block 2 has separable contacts housed in one or more individual cut-off elements.
  • the electrical contacts can be moved between open and closed positions, respectively to interrupt or allow the flow of electrical current between the connection pads 5.
  • connection interface 3 is mounted between the actuator block 4 and the cut-off block 2 in order to allow an actuator of the actuator block 4 to move the separable contacts of the cut-off block 2 between the open positions and closing.
  • the cut-off unit 2 comprises a base 21 and at least one cut-off element 22, each cut-off element 22 being associated with a phase of the electric current.
  • each switching element 22 is removably received in a housing defined by the base 21.
  • the base 21 is fixed to an electrical panel when the switching device 1 is in the mounted configuration.
  • the switching device 1 is a multipolar device suitable for interrupting a polyphase current, in particular a three-phase current, and for this purpose comprises a plurality of preferably identical switching elements 22 received in the base 21.
  • the switching device 1 comprises three switching elements 22.
  • the number of breaking elements 22 may be different, for example equal to four in the case of a three-phase current with neutral.
  • each cut-off element 22 comprises two fixed electrical contacts 221 and a movable electrical contact 222.
  • the fixed contacts 221 are respectively electrically connected to the upstream and downstream connection pads 5.
  • the movable contact 222 is movable relative to the fixed contacts 221, here by translation in a direction of movement, between the open position and the closed position.
  • the movable contact 222 is integral with a movable bridge 223 movable in translation relative to a body 224 fixed to a housing of the cut-off element 22.
  • each cut-off element 22 also comprises an elastic return member 225, such as a helical spring, which exerts pressure on the movable contact 222 in the direction of the fixed contacts 221 in order to accentuate the electrical contact between fixed contacts 221. and movable 222 when these fixed 221 and movable 222 contacts are in the closed position.
  • an elastic return member 225 such as a helical spring
  • Each fixed contact 221 comprises a contact pad 226 made of an electrically conductive material.
  • the movable contact 222 comprises contact pads 227 arranged opposite the contact pads 226. In the closed position, the pads 226 and 227 are brought into contact, allowing the passage of electric current between the fixed contacts 221. upstream and downstream.
  • Each cut-off element 22 also comprises a connecting member 228 integral in translation with the movable bridge 223 and making it possible to mechanically connect the movable bridge 223 with the actuator unit 4, as explained below.
  • the connecting member 228 protrudes from a front face of the cut-off element 22.
  • the connecting member 228 here comprises a head, for example of spherical shape, and a body extending longitudinally from a base of the head to the movable bridge 223 and forming a connecting portion.
  • the maximum width of the longitudinal body is less than the greatest width of the head of the connecting member 228.
  • each connecting member 228 is made of plastic, for example molded plastic.
  • the actuator unit 4 comprises an actuator 41 and a movable paddle 42. To facilitate reading of the figure 3 , only a part of the actuator block 4 is illustrated.
  • the actuator 41 is arranged to reversibly move the movable pallet 42 in translation along a longitudinal axis Y4.
  • the longitudinal axis Y4 is parallel with the direction of movement of the movable contacts 222 and extends between the front and the rear of the device 1.
  • the actuator 41 comprises an electromagnet and the movable pallet 42 comprises a magnetic material, for example a ferromagnetic material.
  • the interface 3 comprises a housing 31 fixedly mounted on a front face of the cut-off block 2, for example by being fixedly connected to the base 21.
  • the actuating block 4 is fixed. on a front face of the interface 3 integrally with the housing 31.
  • the housing 31 here comprises through openings 331 each disposed opposite one of the cut-off elements 22.
  • the interface 3 also comprises a shaft 32 extending along a longitudinal axis X32 and a support structure 33 receiving the shaft 32.
  • the axis X32 is perpendicular to the axis Y4.
  • the X32 axis is oriented horizontally.
  • the shaft 32 is here mounted in rotation with respect to the support structure 33.
  • the support structure 33 defines a housing 331 for receiving the shaft 32.
  • the housing 311 has the shape of a cylindrical or tubular cavity extending along the axis X32, the ends of which opposites form openings which provide access to ends 323 of shaft 32.
  • the support structure 33 is integral with the movable pallet 332.
  • the movable pallet 42 is coupled to the support structure 33 by means of a mechanical device of which only one element 43 is visible on the face. figure 3 .
  • the support structure 33 also comprises windows 332 formed on a rear face and which open out towards the interior of the housing 331. In the assembled configuration, the windows 332 are aligned with the openings 311 of the housing 31 and are thus aligned with the elements of the housing. cut 22, preferably aligned with the connecting members 228 along the direction of movement, so as to allow the passage of the connecting members 228 through the windows 332 and openings 311.
  • the shaft 32 comprises eccentric fastening elements 321 each intended to be associated with a connecting member 228. It is therefore understood that the shaft 32 here comprises as many fastening elements 321 as cut-off elements 22.
  • the fasteners 321 are aligned along the X32 axis.
  • each fastener 321 has a cylindrical shape centered on the X32 axis and defines an internal housing delimited by bottom walls perpendicular to the X32 axis and delimited at least in part by a side wall 3221 parallel to the X32 axis which connects the two opposite bottom walls.
  • Each fastener 321 has a first opening 3222 and a second opening 3223.
  • the openings 3222 and 3223 are each formed in the side wall 321 by describing an arc of a circle centered around the axis X32.
  • the fasteners 321 are identical and the respective openings 3222 and 3223 of the fasteners 321 are aligned with each other.
  • the shaft 32 also comprises connection portions 322, for example in the form of a rod or of a cylinder, aligned along the axis X32, which connect the elements of fixing 321 two by two.
  • connection portions 322 for example in the form of a rod or of a cylinder, aligned along the axis X32, which connect the elements of fixing 321 two by two.
  • each connection portion 322 connects two immediately neighboring fastening elements 321 by their bottom walls facing each other.
  • the first opening 3222 has a width strictly less than the width of the second opening 3223.
  • the widths of the first and second openings are here measured parallel to the axis X32.
  • the openings 3222 and 3223 are adjoining and thus form a continuous opening of variable width extending at least over a part of the periphery of the side wall 321.
  • the width of the second opening 3223 is greater than the greatest width of the head of the connecting member 228, that is to say here the diameter of the head of the connecting member 228.
  • the width of the first opening 3222 is less than said greatest width of the connecting member 228, but is greater than the greatest width of the connecting portion of the connecting member 228.
  • the shaft 32 is movable, by rotation about the axis X32, between a first position and a second position.
  • the second opening 3223 is aligned with the window 332 with which the fixing element 321 is associated, which allows the insertion of the connecting member 228 inside the housing defined by said locking element. fixing 321.
  • the head of the connecting member 228 can then be fully inserted inside said housing.
  • the head of each link member 228 is freely movable in translation with respect to said fixing member 321 to decouple the movable pallet 42 from each link member 228.
  • the head of the connecting member is retained inside the internal housing. This first position corresponds to an unlocked state of interface 3.
  • the heads of the connecting members 228 are here aligned along an axis parallel to the axis X32.
  • the first opening 3222 is aligned with said window 332, which prevents the insertion of the link member 228 inside said housing or, on the contrary, prevents the withdrawal of the link member 228. outside the housing defined by said fixing element 321, since the width of the first opening is less than the greatest width of the head of the connecting member 228.
  • This second position corresponds to a locked state of the interface 3.
  • connection interface 3 is switchable between a locked state and an unlocked state.
  • the support structure 33 and the movable pallet 32 are integral in translation with the movable bridges 223 of the cut-off elements 22.
  • the movable contacts 222 are movable by the actuator 41 between the open position. and the closed position.
  • the support structure 33 and the movable pallet 32 are decoupled from the movable bridges 223 of the cut-off elements 22.
  • the actuator 41 is no longer able to move the movable contacts 222 between the position d. 'open and closed position.
  • the shaft 32 comprises at least one control portion 323 placed at one end of the shaft 32 and allowing an operator to turn the shaft 32 between the first position and the second position around the longitudinal axis X32.
  • the control portion 322 is able to cooperate by complementarity of shape with a tool such as a screwdriver or a wrench.
  • control portion 322 comprises an indentation formed on an end surface of the shaft 32 perpendicular to the axis X32 and having the shape of a slot, or a cruciform shape, or a shape of polygon, or any other similar shape.
  • control portion 323 is accessible from the outside of the housing 31, here thanks to an opening made in a side wall of the housing 31, which allows the insertion of the tool shank.
  • each end of the shaft 32 is provided with such a control portion 323.
  • connection interface 3 comprises an operating device 324 including a manual control member 325, such as a pivoting lever, coupled to the shaft 32 or to a control portion 323 of the shaft 32 for rotating the shaft 32 around its longitudinal axis X32.
  • the member 325 is mounted on a lateral face of the housing 31.
  • the shaft 32 is made of a metallic material, for example a Zamak alloy.
  • the shaft 32 is made for example of plastic.
  • the shaft 32 is made of an electrically conductive material, for example the aforementioned metallic material
  • the member 228 is made of an electrically conductive material, for example a metallic material
  • the shaft 32 has a reduction in diameter, each receiving an inter-phase partition formed by the support structure 33, for the purpose of inter-phase electrical insulation.
  • Each inter-phase partition forms a portion of one of the windows 332.
  • the shaft 32 is in one piece, that is to say that the fixing elements 321 are here formed integrally with the connection portions 322 and the control portions 323.
  • connection interface 3 An example of operation for locking the connection interface 3 is now described with reference to the figures 4 to 6 .
  • the interface 3 is assembled configuration with the actuating unit 4, while being dissociated from the cut-off unit 2.
  • the shaft 32 is in the first position.
  • the interface 3 is translated towards the cut-off block 2, here following the direction of movement illustrated by the arrow F1, along the direction of movement, until the head of each connecting member 228 of each cut-off elements 22 is received in the housing delimited by the corresponding fixing member 321 after passing through the second opening 3223 of this fixing member 321.
  • the housing 31 is in contact with the base 21, as shown in figure 5 , and can then be attached to the base 21.
  • the switching device 1 is then in its assembled configuration.
  • the interface 3 is still in the unlocked state, so that a movement of the movable pallet 42 by the actuator 41 does not induce any movement of the movable contacts 222 between the open and closed positions.
  • the shaft 32 is turned towards its second position, for example by means of the control portion 323 and / or the lever 325, in the direction illustrated by the arrow F2.
  • the head of the connecting member 228 is prevented from leaving the housing delimited by the fixing 321 during translation in the direction of movement, in particular due to the fact that the first opening 3222 has a width less than the width of the head of the connecting member 228.
  • each fixing element 332 is wedged on the head of the associated connecting member 228, in order to prevent accidental uncoupling of these elements during operation, in particular under the effect of vibrations.
  • each member 228 and its respective fixing element 332 Preferably, a clearance-free connection is ensured between each member 228 and its respective fixing element 332, in particular by using materials having a certain elasticity, and / or by details of complementary shapes.
  • the interface 3 is in the locked state, so that a movement of the movable pallet 42 in translation along the axis of movement causes a corresponding movement of the movable contacts 222 between the open and closed positions.
  • Interface 3 makes it possible to reduce the space required to mount and couple the actuator block 4 to the cut-off block 2 when installing the device 1, since it is no longer necessary to move the mobile pallet 42 in vertical translation to hook it to the connecting members 228. On the contrary, as explained above, the locking is obtained by turning the shaft 32 after having positioned the interface 3 in contact with the cut-off block 2 by translation according to the direction of travel.
  • the unlocking and dismantling of the actuating unit and of the cut-off unit 2 are also simplified, since the unlocking is obtained simply by turning the shaft 32 in the opposite direction.
  • connection interface 3 can remain in the unlocked state even when it is mounted on the cut-off block 2. This allows an operator to power the actuator 41 and move the movable pallet 42, for example. to carry out tests of the device 1 in real conditions, without however setting the movable contacts 222. In motion, the risk of an electrical accident is reduced.
  • the spherical head of the connecting member 228 has flat side faces 2281 in the form of flats. This makes it possible to reduce the width of the openings 311 and of the windows 332 and therefore to reduce the lateral bulk of the device 1. In this case, the greatest width of the head of the connecting member 228 is measured between the faces. flat sides 2281.
  • the connecting member 228 may have a different shape, for example a valve or screw shape with a flat head.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Manufacture Of Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fuses (AREA)
EP19204397.4A 2018-10-22 2019-10-21 Appareil de coupure d'un courant électrique Active EP3644339B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1859735A FR3087576B1 (fr) 2018-10-22 2018-10-22 Appareil de coupure d'un courant electrique

Publications (2)

Publication Number Publication Date
EP3644339A1 EP3644339A1 (fr) 2020-04-29
EP3644339B1 true EP3644339B1 (fr) 2021-05-26

Family

ID=65494364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19204397.4A Active EP3644339B1 (fr) 2018-10-22 2019-10-21 Appareil de coupure d'un courant électrique

Country Status (4)

Country Link
US (1) US10872738B2 (zh)
EP (1) EP3644339B1 (zh)
CN (1) CN111081499A (zh)
FR (1) FR3087576B1 (zh)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516304A1 (fr) 1981-11-09 1983-05-13 Telemecanique Electrique Interrupteur a commande mecanique et ouverture automatique
US4893102A (en) * 1987-02-19 1990-01-09 Westinghouse Electric Corp. Electromagnetic contactor with energy balanced closing system
ITBG20050026A1 (it) * 2005-05-13 2006-11-14 Abb Service Srl Interruttore con equipaggio mobile sospeso
CN101719434B (zh) * 2009-12-08 2012-05-23 北京大学 一种微机械加速度锁存开关
RU2562451C1 (ru) * 2011-11-17 2015-09-10 АББ Технолоджи Лтд. Механизм взаимной блокировки для переключающих устройств
US9019050B2 (en) * 2011-12-06 2015-04-28 Schneider Electric Industries Sas Electric switching system comprising an electric switching module including two elements coupling a contact(S)-holder with its driving device
EP2624274B1 (en) * 2012-02-03 2014-12-31 ABB S.p.A. Hybrid current switching device
FR2999781B1 (fr) * 2012-12-18 2015-01-02 Schneider Electric Ind Sas Dispositif modulaire de commutation electrique comportant au moins un bloc de coupure unipolaire et ensemble de commutation comportant de tels dispositifs.
FR2999791B1 (fr) 2012-12-18 2015-01-02 Schneider Electric Ind Sas Dispositif modulaire de commutation electrique comportant au moins un bloc de coupure unipolaire et ensemble de commutation comportant de tels dispositifs
FR3003392B1 (fr) * 2013-03-15 2016-07-22 Schneider Electric Ind Sas Bloc unitaire de commutation et dispositif de commutation comportant au moins un tel bloc
FR3026222B1 (fr) * 2014-09-24 2017-06-23 Schneider Electric Ind Sas Actionneur electromagnetique et contacteur electrique comprenant un tel actionneur
FR3060198B1 (fr) * 2016-12-08 2019-05-17 Schneider Electric Industries Sas Appareil electrique de coupure d'un courant electrique

Also Published As

Publication number Publication date
FR3087576B1 (fr) 2020-11-13
EP3644339A1 (fr) 2020-04-29
CN111081499A (zh) 2020-04-28
US20200126736A1 (en) 2020-04-23
US10872738B2 (en) 2020-12-22
FR3087576A1 (fr) 2020-04-24

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