WO2019139290A1 - Dispositif coulissant pour tiroir - Google Patents

Dispositif coulissant pour tiroir Download PDF

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Publication number
WO2019139290A1
WO2019139290A1 PCT/KR2018/016806 KR2018016806W WO2019139290A1 WO 2019139290 A1 WO2019139290 A1 WO 2019139290A1 KR 2018016806 W KR2018016806 W KR 2018016806W WO 2019139290 A1 WO2019139290 A1 WO 2019139290A1
Authority
WO
WIPO (PCT)
Prior art keywords
slide
ball
rail
rolling surface
disposed
Prior art date
Application number
PCT/KR2018/016806
Other languages
English (en)
Korean (ko)
Inventor
이두면
김기광
Original Assignee
(주)세고스
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 (주)세고스 filed Critical (주)세고스
Priority to CN201890001463.1U priority Critical patent/CN213664408U/zh
Priority to EP18900292.6A priority patent/EP3738470A4/fr
Priority to US16/959,913 priority patent/US20210068540A1/en
Publication of WO2019139290A1 publication Critical patent/WO2019139290A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/49—Sliding drawers; Slides or guides therefor with double extensible guides or parts
    • A47B88/493—Sliding drawers; Slides or guides therefor with double extensible guides or parts with rollers, ball bearings, wheels, or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/437—Rollers for slides or guides
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/473—Braking devices, e.g. linear or rotational dampers or friction brakes; Buffers; End stops
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0002—Guide construction for drawers
    • A47B2210/0008—Guide construction for drawers having a roller on an intermediary slide rail between the cabinet rail and the drawer rail
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0002—Guide construction for drawers
    • A47B2210/0029—Guide bearing means
    • A47B2210/0032—Balls
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0002—Guide construction for drawers
    • A47B2210/0029—Guide bearing means
    • A47B2210/0032—Balls
    • A47B2210/0035—Balls cages therefor, e.g. for telescopic slides
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0002—Guide construction for drawers
    • A47B2210/0029—Guide bearing means
    • A47B2210/0037—Rollers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0002—Guide construction for drawers
    • A47B2210/0064—Guide sequencing or synchronisation
    • A47B2210/0067—Two slide synchronisation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/473—Braking devices, e.g. linear or rotational dampers or friction brakes; Buffers; End stops
    • A47B88/477—Buffers; End stops

Definitions

  • the present invention relates to a slide apparatus for a drawer, and more particularly, to a slide apparatus for a drawer which can mix a plurality of slide balls having different tensile strengths to reduce rigidity while reducing noise during operation.
  • a sliding device for a drawer is provided between a main body and a main body, and is used such that when the user opens and closes the main body, the main body is easily drawn out or pulled out from the main body.
  • Such a sliding device for a drawer is provided with a two-stage folding type and a three-fold folding type.
  • the fixed rail is fastened to the inner surface of the main body
  • the movable rail is fastened to the outer surface of the housing.
  • a middle rail is provided between the fixed rail and the moving rail, and a plurality of slide balls are disposed between the middle rail and the fixed rail and between the middle rail and the moving rail to perform rolling motion.
  • the slide ball is made of the same material and used.
  • the slide ball is made of a metal material or a plastic material.
  • the present invention has been made to solve the above problems, and it is an object of the present invention to provide a slide device for a drawer which can reinforce rigidity while mixing a plurality of slide balls having different tensile strengths, There is a purpose.
  • a slide device for a drawer including: a stationary rail fastened to a main body; A movable rail fastened to the housing and slidably moved on the fixed rail; A middle rail disposed between the fixed rail and the movable rail and guiding the sliding movement of the movable rail; And a plurality of slide balls disposed between the intermediate rail and the fixed rail and between the intermediate rail and the moving rail and slidably moving and having different tensile strengths, wherein the slide ball having a large tensile strength is disposed on the outermost side And a ball assembly.
  • the intermediate rail includes: a plate portion disposed between the fixed rail and the movable rail; And a contact portion provided on both sides along the longitudinal direction of the plate portion and having a rolling surface in which the slide ball of the ball assembly is partially received, wherein the rolling surface is provided on one side and the other side of the plate portion, And may be formed in a plurality of spaced apart directions.
  • the ball assembly includes: a retainer having a plurality of through holes formed at both ends and corners at regular intervals in the longitudinal direction; A first slide ball inserted into a first through hole formed at one end of the retainer and disposed on a first rolling surface curved at one side edge of the contact portion; A second slide ball inserted into a second through hole formed in an edge of the retainer and disposed on a second rolling surface curved at the other edge of the contact portion; And a third slide ball inserted into a third through hole formed at the other end of the retainer and disposed on a third rolling surface curved on the lower side of the second rolling surface.
  • first through-hole and the third through-hole may be provided on the same line, and the second through-hole may be provided between the first through-hole and the third through-hole.
  • the first rolling surface, the second rolling surface, and the third rolling surface are curved to have the same diameter, and the first slide ball, the second slide ball, and the third slide ball are formed to have the same diameter It is possible.
  • the first rolling surface and the second rolling surface are curved to have the same diameter and the third rolling surface is curved to have a larger diameter than the second rolling surface, And the third slide ball may be provided with a larger diameter than the two slide balls.
  • the ball assembly may be provided such that a plurality of the first slide balls and the slide balls disposed at both side ends of the third slide ball have a larger tensile strength than the slide balls positioned at the center.
  • the ball assembly may be provided such that the slide balls disposed on both side ends of the plurality of second slide balls have a larger tensile strength than the slide balls positioned on the center side.
  • the ball assembly may be provided such that the difference in tensile strength between the slide balls having different tensile strengths is 400 MPa or more.
  • the ball assembly may be formed of a material having a tensile strength of 405 to 2500 MPa and a material having a tensile strength of 5 to 150 MPa.
  • the stationary rail and the movable rail may further include a stopper protruding from the inner circumferential surface and restricting the movement of the ball assembly so that the ball assembly slides only within a predetermined area.
  • the intermediate rail may further include a stopper for restricting movement such that the ball assembly slides only within a predetermined area.
  • noise can be reduced by using a slide ball having a low tensile strength as a whole, and a slide ball having a high tensile strength can be used for a portion to which an impact load is applied, Effect can be obtained.
  • FIG. 1 is a perspective view schematically showing a slide device for a drawer according to an embodiment of the present invention
  • FIG. 2 is an exploded perspective view schematically showing a drawer slide device according to an embodiment of the present invention
  • FIG. 3 is a side view schematically showing a drawer slide device according to an embodiment of the present invention.
  • FIG. 4 is a perspective view schematically showing a fixed rail and a movable rail extracted from a drawer slide device according to an embodiment of the present invention
  • FIG. 5 is a side view schematically showing a middle rail extracted from a drawer slide device according to an embodiment of the present invention.
  • FIG. 6 is a perspective view schematically showing a middle rail extracted from a drawer slide device according to an embodiment of the present invention
  • FIG. 7 is a plan view schematically showing a retainer in a drawer slide device according to an embodiment of the present invention.
  • FIG. 8 is a view schematically showing a load application state of a drawer slide device according to an embodiment of the present invention
  • FIG. 9 is a front view and a rear view schematically showing a state in which a ball assembly is arranged on a middle rail in a drawer slide device according to an embodiment of the present invention.
  • FIG. 10 is a schematic view illustrating a drawer slide apparatus according to another embodiment of the present invention.
  • FIG. 11 is a view schematically showing a drawer slide apparatus according to another embodiment of the present invention.
  • FIGS. 1 to 3 are a perspective view, an exploded perspective view and a side view schematically showing a drawer slide device according to an embodiment of the present invention.
  • FIG. 4 is a perspective view schematically showing a fixed rail and a movable rail extracted from the drawer slide device
  • FIGS. 5 and 6 are side views schematically showing the middle rail extracted from the drawer slide device
  • FIG. 7 is a plan view schematically showing the retainer in the drawer slide device.
  • FIG. 9 is a front view schematically showing a state in which the ball assembly is disposed on the intermediate rail in the drawer slide device.
  • FIG. 8 is a view schematically showing a load state applied to the slide device for a drawer, And FIG.
  • a sliding device 100 for a drawer includes a fixed rail 200 fastened and fixed to a main body 10, A middle rail 400 disposed between the fixed rail 200 and the movable rail 300 for guiding sliding movement of the movable rail 300, a movable rail 300 sliding on the rail 200, A plurality of slide balls are disposed between the intermediate rail 400 and the fixed rail 200 and between the intermediate rail 400 and the movable rail 300 and are slidingly moved and have different tensile strengths. And a ball assembly 500 in which a slide ball having a large strength is arranged on the outermost side.
  • a slide ball made of a material having a relatively small tensile strength is disposed on the center side
  • a slide ball made of a material having a relatively large tensile strength is disposed on the outermost side
  • the fixed rail 200 is fixed to the inner surface of the main body 10 and is fixed in position.
  • the movable rail 300 is coupled to the outer surface of the housing 20 and slides on the fixed rail 200, So that the body 20 can be drawn in or drawn out.
  • a fixed rail stopper 210 protruding inwardly from the inner circumferential surface of the fixed rail 200 and the movable rail 300 for restricting the movement of the ball assembly 500 to slide only within a predetermined area, And a stopper 310 are respectively formed.
  • the fixed rail stopper 210 and the movable rail stopper 310 are formed as a pair and spaced apart from each other by a predetermined distance. With this configuration, the ball assembly 500 is caused to slide only between the fixed rail stopper 210 and the movable rail stopper 310, respectively.
  • the intermediate rail 400 includes a plate portion 410 disposed between the fixed rail 200 and the movable rail 300 and a plate portion 410 provided on both sides along the longitudinal direction of the plate portion 410, And a contact portion 420 having a rolling surface such that the slide ball of the slide plate 500 is partially received.
  • the rolling surfaces are formed at three sides of one side and the other side of the plate portion 410 so as to be spaced apart from each other along the circumferential direction thereof, and a plurality of slide balls are provided in rolling contact.
  • the contact portion 420 is formed on the upper side and the lower side of the plate portion 410, and the contact portion 420 formed on the upper side is formed to be opposite to the contact portion 420 formed on the lower side do. That is, three rolling surfaces are formed along the circumferential direction on the upper side of the plate portion 410, and three rolling surfaces are formed along the circumferential direction from the lower side of the plate portion 410.
  • the rolling surface includes a first rolling surface 421 curved at one side edge of the contact portion 420 and a second rolling surface 421 formed at the other edge of the contacting portion 420, And a third rolling surface 423 curved at a diameter larger than the second rolling surface 422 below the second rolling surface 422.
  • the second rolling surface 422 is curved at the same diameter as the first rolling surface 422, . That is, the first and second rolling surfaces 421 and 422 are provided with slide balls having the same diameter, and the third rolling surface 423 is provided with a slide ball with a larger diameter.
  • the intermediate rail 400 is provided with a middle rail stopper 430 for restricting movement of the ball assembly 500 so that the ball assembly 500 slides only within a predetermined area.
  • the intermediate rail stoppers 430 are formed as a pair and spaced apart from each other by a predetermined distance, and protrude from the plate portion 410 toward the first rolling surface 421. That is, the distance between the intermediate rail stopper 430 and the ball assembly 500 is longer than the length of the ball assembly 500, so that the ball assembly 500 is slidably moved between the intermediate rail stoppers 430.
  • the intermediate rail stopper 430 formed on the upper side of the plate portion 410 is formed to be antiparallel to the intermediate rail stopper 430 formed on the lower side of the plate portion 410. As shown in FIG. That is, the intermediate rail stopper 430 formed on the upper side of the plate portion 410 is biased to the left with reference to the drawing, and the intermediate rail stopper 430 formed on the lower side of the plate portion 410, And is biased to the right.
  • the distance between the intermediate rail stopper 430 formed on the upper side of the plate portion 410 and the distance between the intermediate rail stopper 430 formed on the lower side of the plate portion 410 may be different from each other.
  • the intermediate rail stopper 430 formed in this way restricts the moving range of the ball assembly 500 together with the fixed rail stopper 210 and the movable rail stopper 310 to limit the maximum draw-out distance of the accommodating body.
  • the ball assembly 500 includes a retainer 510 having a plurality of through holes formed in a lattice shape and having a plurality of through holes formed at both ends and corners at regular intervals in the longitudinal direction, A first slide ball 520 inserted into the first slide surface 511 and disposed on the first rolling surface 421 and a second slide ball 520 inserted into a second through hole 512 formed on an edge of the retainer 510, A second slide ball 530 provided at the same diameter as the second slide surface 520 and disposed on the second rolling surface 422 and a third through hole 513 formed on the other end of the retainer 510, And a third slide ball 540 having a larger diameter than the second slide ball 530 and disposed on the third rolling surface 423.
  • the retainer 510 has first through holes 511 formed at regular intervals along the longitudinal direction at one side end thereof, and second through holes 511 are formed at regular intervals along the longitudinal direction at the edges, And a third through hole 513 is formed at a predetermined distance along the longitudinal direction at the other end.
  • the first through-hole 511 and the third through-hole 513 are provided on the same line, and the second through-hole 512 is formed through the first through-hole 511 and the third through- 513, respectively.
  • the first slide ball 520 and the second slide ball 530 are provided with the same diameter
  • the third slide ball 540 is provided with the first slide ball 520 and the second slide ball 530, And is larger in diameter than the slide ball 520.
  • a rotational force R is applied in a clockwise direction so that the first slide ball 520 and the second slide ball 540 are rotated by the rotation of the first slide ball 520, A load P higher than that of the second slide ball 530 is applied.
  • a larger load is applied to the third slide ball 540 by the rotational force R, thereby increasing the wear and damage of the third slide ball 540 .
  • the third slide ball 540 and the third slide surface 423 are provided to have a larger diameter than the first slide ball 520 and the first rolling surface 421, The contact area of the rolling contact surface 540 is increased.
  • the third slide ball 540 and the third slide ball 540 are dispersed so that the third slide ball 540 and the third slide ball 540 are dispersed in the concentrated load applied between the moving rail 300 and the third slide ball 540, The abrasion and damage of the substrate can be reduced.
  • the ball assembly 500 includes slide balls 521 and 541 disposed at both ends of a plurality of the first slide ball 520 and the third slide ball 540,
  • the slide balls 522 and 542 have a larger tensile strength than the slide balls 522 and 542.
  • the ball assembly 500 may be configured such that the slide ball 532 disposed at both ends of the plurality of second slide balls 530 has a larger tensile strength than the slide ball 532 positioned at the center have.
  • the ball assembly 500 includes slide balls 521 and 541 positioned at both ends of the first and third slide balls 520 and 540 among the first to third slide balls 520, 530, Or the slide balls 521, 531, and 541 located at both ends of the first to third slide balls 520, 530, and 540 may be formed of a material having a high tensile strength can do. Therefore, the number of the slide balls of the material having a large tensile strength can be selected in consideration of the required rigidity according to the intended use of the accommodating body.
  • the ball assembly 500 can be applied to a material having a tensile strength of 400 MPa or more different from that of the slide ball having a different tensile strength.
  • the slide ball having a large tensile strength is made of a material having a tensile strength of 405 to 2500 MPa
  • the slide ball having a small tensile strength can be provided of a material having a tensile strength of 5 to 150 MPa.
  • an iron ball slide ball having a tensile strength of 600 MPa is manufactured, and a slide ball made of a polyacetal resin (POM) having a tensile strength of 100 MPa is used.
  • POM polyacetal resin
  • the comparative example is a case where only a slide ball made of iron is used.
  • the slide balls 521, 531, and 541 positioned at both ends of the first to third slide balls 520, 530, and 540 are used as the slide balls.
  • the balls 522, 532 and 542 were made of a slide ball made of polyacetal resin.
  • the slide balls 521 and 541 which are located at both side ends of the first and third slide balls 520 and 540, are used as the slide balls, and the slide balls 522, 542 and the second slide ball 530 were made of polyacetal resin.
  • the slide ball located at both ends is reinforced by using a slide ball made of a material having relatively high tensile strength such as iron and the like,
  • the slide ball positioned can be made of a material having a relatively low tensile strength such as polyacetal resin to reduce noise generation.
  • FIG. 10 is a view schematically showing a drawer slide apparatus according to another embodiment of the present invention.
  • a slide device for a drawer according to another embodiment of the present invention is provided with the same configuration as the slide device for a drawer according to the embodiment of the present invention described with reference to FIGS. 1 to 9, 2 rolling surface and the third rolling surface are curved to have the same diameter, and the first slide ball, the second slide ball and the third slide ball are provided with the same diameter.
  • the first to third slide balls are provided with the same diameter.
  • FIG. 11 is a view schematically showing a drawer slide apparatus according to another embodiment of the present invention.
  • the slide device for a drawer according to another embodiment of the present invention is provided in the same configuration as the slide device for a drawer according to the embodiment of the present invention described in Figs. 1 to 9, but differs in the number of arrayed slide balls.
  • the slide balls disposed on the contact portion are provided in two rows,
  • the slide balls disposed in the contact portion may be provided in four rows.

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  • Drawers Of Furniture (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

La présente invention concerne un dispositif coulissant pour un tiroir, qui mélange et utilise une pluralité de billes coulissantes présentant des résistances à la traction différentes, ce qui permet de réduire le bruit lors de son actionnement et de renforcer sa rigidité. Le dispositif coulissant pour un tiroir comprend : un rail fixe couplé de manière fixe à un corps principal ; un rail mobile couplé de manière fixe à un corps de stockage et pouvant se déplacer de manière coulissante sur le rail fixe ; un rail intermédiaire disposé entre le rail fixe et le rail mobile de façon à guider le mouvement coulissant du rail mobile ; et des ensembles de billes qui se déplacent de manière coulissante en étant disposés entre le rail intermédiaire et le rail fixe et entre le rail intermédiaire et le rail mobile, et qui comprennent une pluralité de billes coulissantes présentant des résistances à la traction différentes, les billes coulissantes présentant une résistance à la traction supérieure des ensembles de billes étant disposées sur le côté le plus à l'extérieur. Grâce à cette configuration, il est possible d'obtenir les effets de réduction du bruit en utilisant généralement des billes coulissantes présentant une résistance à la traction inférieure, et un renforcement de la rigidité en utilisant des billes coulissantes présentant une résistance à la traction supérieure au niveau d'une région à laquelle une charge d'impact est appliquée.
PCT/KR2018/016806 2018-01-10 2018-12-28 Dispositif coulissant pour tiroir WO2019139290A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201890001463.1U CN213664408U (zh) 2018-01-10 2018-12-28 抽屉用滑动装置
EP18900292.6A EP3738470A4 (fr) 2018-01-10 2018-12-28 Dispositif coulissant pour tiroir
US16/959,913 US20210068540A1 (en) 2018-01-10 2018-12-28 Sliding device for drawer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180003324A KR20190085332A (ko) 2018-01-10 2018-01-10 서랍용 슬라이드 장치
KR10-2018-0003324 2018-01-10

Publications (1)

Publication Number Publication Date
WO2019139290A1 true WO2019139290A1 (fr) 2019-07-18

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ID=67218634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2018/016806 WO2019139290A1 (fr) 2018-01-10 2018-12-28 Dispositif coulissant pour tiroir

Country Status (5)

Country Link
US (1) US20210068540A1 (fr)
EP (1) EP3738470A4 (fr)
KR (1) KR20190085332A (fr)
CN (1) CN213664408U (fr)
WO (1) WO2019139290A1 (fr)

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US20220304466A1 (en) * 2020-08-25 2022-09-29 Dongguan Dige Hardware Products Co., Ltd. Slide rail assembly and cabinet comprising the same

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KR102428922B1 (ko) * 2020-06-11 2022-08-04 (주)세고스 슬라이드 장치
KR102450391B1 (ko) * 2020-11-17 2022-10-04 케이비아이동국실업 주식회사 착탈구조를 가지는 슬라이딩형 글로브박스
WO2023286888A1 (fr) * 2021-07-15 2023-01-19 (주)세고스 Dispositif coulissant

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KR20190085332A (ko) 2019-07-18
CN213664408U (zh) 2021-07-13
EP3738470A4 (fr) 2021-10-06
EP3738470A1 (fr) 2020-11-18
US20210068540A1 (en) 2021-03-11

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