EP3310235B1 - Reinigungsgerät zur einwirkung auf eine zu reinigende fläche - Google Patents

Reinigungsgerät zur einwirkung auf eine zu reinigende fläche Download PDF

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Publication number
EP3310235B1
EP3310235B1 EP16727983.5A EP16727983A EP3310235B1 EP 3310235 B1 EP3310235 B1 EP 3310235B1 EP 16727983 A EP16727983 A EP 16727983A EP 3310235 B1 EP3310235 B1 EP 3310235B1
Authority
EP
European Patent Office
Prior art keywords
roller part
roller
cleaning
endless
cleaning device
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
EP16727983.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3310235A1 (de
Inventor
Matthias Pfeiffer
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.)
Vorwerk and Co Interholding GmbH
Original Assignee
Vorwerk and Co Interholding GmbH
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 Vorwerk and Co Interholding GmbH filed Critical Vorwerk and Co Interholding GmbH
Publication of EP3310235A1 publication Critical patent/EP3310235A1/de
Application granted granted Critical
Publication of EP3310235B1 publication Critical patent/EP3310235B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A47L11/4047—Wound-up or endless cleaning belts
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/26—Floor-scrubbing machines, hand-driven
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/28—Floor-scrubbing machines, motor-driven
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/28—Floor-scrubbing machines, motor-driven
    • A47L11/282—Floor-scrubbing machines, motor-driven having rotary tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers

Definitions

  • the invention relates to a cleaning device, in particular a floor cleaning device, with a cleaning device which is at least partially covered with an endless cleaning element which, during action on a surface to be cleaned, can be rotated continuously relative to the surface to be cleaned, the cleaning device at least one towards the has a first roller part and a second roller part, wherein a radius of curvature of a roller portion of the first roller part is different from a radius of curvature of a roller portion of the second roller part.
  • Cleaning devices of the aforementioned type are known in the prior art. These can be, for example, wet cleaning devices which have a moistenable cleaning roller as the cleaning device.
  • the cleaning device can in principle be designed as a device guided by a user, or as an automatically movable cleaning robot.
  • the publication DE 20 2007 004 878 U1 discloses for example a cleaning device for damp wiping floor coverings.
  • the cleaning device has a cloth roll which has a hollow body which can be moistened from the inside and which is covered with a velor or microfiber fleece as an endless cleaning element.
  • This endless cleaning element is formed over the entire circumference of the rag roller, rotation of the rag roller relative to the floor covering to be cleaned simultaneously rotating the endless cleaning element.
  • the cleaning device To clean the rag roll of dirt absorbed when it acts on the floor surface, the cleaning device has a spinning function for self-cleaning the rag roll, in which the outer roll is rinsed and spun off with the supply of liquid.
  • the disadvantage here is that the regeneration of the endless cleaning element, i. H. throwing off the dirty liquid during a regeneration process that is separate from the wiping process. It is therefore necessary for a regeneration of the endless cleaning element to stop the wiping process and to carry out a regeneration process, which may require an additional motor or a gear to provide a high speed of the cleaning device during the regeneration process.
  • cleaning devices are known from the prior art which have a first roller part which can be placed on the surface to be cleaned and a second roller part, the radii of curvature of the roller parts being different.
  • the EP 2436296 A a sweeper with a dehumidifier from a rotating wipe, which is driven by an electric motor in a vertical plane around pulleys.
  • the publication US 1798327 A discloses a scrubber with a scrubbing element which has an endless wipe which is deflected over rollers.
  • US 2953798 A a surface processing device with an endless cleaning cloth, which can be rotated continuously around a cleaning roller relative to a surface to be cleaned, the cleaning cloth being further deflected via guide rollers with a smaller radius of curvature.
  • the invention proposes a cleaning device in which at least one roller part is arranged in a rotationally fixed manner within the cleaning device.
  • At least one roller part is arranged in a rotationally fixed manner within the cleaning device.
  • the endless cleaning element is pulled over the roller part in the region of this rotationally fixed roller part, so that there is friction between the endless cleaning element and the roller part.
  • This friction can optionally be used for the additional regeneration of the endless cleaning element.
  • one roller part of the cleaning device is designed to be rotationally fixed and another roller part is designed to be rotatable.
  • all roller parts i.e. H. two or more roller parts of the cleaning device, be rotationally fixed, the endless cleaning element being drawn around the roller parts by means of an additional drive device, so that the endless cleaning element can act on the surface to be cleaned.
  • a cleaning device is created with two or more roller parts which have radii of curvature that differ from one another, so that when the roller parts rotate, different centrifugal forces act on the dirty liquid in the region of these radii of curvature due to the different radii of curvature.
  • different areas of one and the same roll can be understood as the first roll part and the second roll part, or alternatively two separate roll parts, which are connected by means of the endless cleaning element.
  • only one of the roller parts can be placed on the surface to be cleaned, so that during an action of the endless cleaning element on the surface to be cleaned there is only contact between, for example, the first roller part and the surface, while the second roller part does not touch the surface to be cleaned.
  • the first roller part serves to act on the surface to be cleaned by means of the endless cleaning element contacting the surface
  • the second roller part serves to regenerate the endless cleaning element. Since the continuous cleaning element is an element continuously rotating around the two roller parts, such as an endless wiping cloth, regeneration of a second partial area of the continuous cleaning element on the second roller part can take place at the same time as a first partial area of the continuous cleaning element acts on the surface to be cleaned , In contrast to the prior art, it is therefore not necessary to interrupt the action on the surface to be cleaned, ie the cleaning process, for a regeneration operation. Rather, action (wiping) and regeneration can take place simultaneously.
  • the dirty liquid is thrown off in the region of the second roller part via the different dimensioning of the radii of curvature of the first and second roller parts, the radius of curvature of the second roller part being less than the radius of curvature of the first roller part, so that a greater centrifugal force is exerted in the region of the second roller part the dirty liquid acts as in the area of the first roller part.
  • At least one roller part is advantageously arranged rotatably within the cleaning device.
  • the endless cleaning element rolls on the circumference of the roller part when the cleaning device rotates. This simplifies the friction-reduced conveying of the endless cleaning element from the first roller part to the second roller part, and back, so that each section of the endless cleaning element can repeatedly pick up dirt and release dirt.
  • the roller part can either be driven actively by means of an electric motor or can be moved passively as a result of a movement of the endless cleaning element. In the latter case, the endless cleaning element is moved by an electric motor assigned to the other roller part or by an electric motor designed separately from the roller parts.
  • a first roller part is advantageously actively driven, while a second roller part also rotates passively as a result of the rotation of the endless cleaning element.
  • the cleaning device is designed as a traction drive, the roller parts being spaced-apart shafts which are connected to one another in a torque-transmitting manner by means of the endless cleaning element.
  • the cleaning device is thus designed like a traction mechanism drive, the torque of an actively driven roller part being transferred to another roller part of the cleaning device, which then also rotates passively.
  • the torque is transmitted through the endless cleaning element, which is placed over the circumferential surfaces of the roller parts, so that both roller parts are located within the area delimited by the endless cleaning element.
  • This embodiment particularly advantageously combines the drive of a second roller part by means of a first roller part and at the same time the absorption of dirt or dirty liquid in the region of the first roller part and the centrifuging of the dirty liquid in the region of the second roller part, or vice versa. It is therefore a continuous regeneration operation with simultaneous action possible on the surface to be cleaned during a normal work process. Since, according to the invention, the traction mechanism drive has two roller parts of different sizes as shafts, the centrifugal force on the larger, first roller part is lower than on the second, smaller roller part.
  • the speed of the cleaning device and thus also the speed of the endless cleaning element can be selected so that no liquid is thrown off in the area of the first roller part, which acts on the surface to be cleaned, while in the area of the second, smaller roller part a greater centrifugal force attacks the dirty liquid so that it is thrown off by the endless cleaning element.
  • the roller parts are connected to one another in a rotationally fixed manner, in particular in one piece.
  • the roller parts are connected to one another directly and not only via the endless cleaning element.
  • the roller parts are partial areas of one and the same roller. This roller is designed so that the individual areas, ie. H. the roller parts have radii of curvature different from one another in order to ensure the change in the centrifugal force on the different roller parts.
  • the roller parts are rotationally fixed to one another, the endless cleaning element being moved relative to the one-part roller.
  • the endless cleaning element reaches the different roller parts with different radii of curvature, so that the centrifugal force acting on the dirty liquid in the region of the second roller part (with a smaller radius of curvature) leads to the dirty liquid being thrown off.
  • the endless cleaning element can be displaced relative to the cleaning device, in particular by means of at least a motor-driven roller part is conveyable.
  • the endless cleaning element can be displaced independently of a movement of the roller parts, so that the endless cleaning element can also be conveyed when the roller parts are arranged in a rotationally fixed manner within the cleaning device.
  • one of the roller parts is particularly advantageously motor-driven.
  • the endless cleaning element be tensioned around the roller parts, the cleaning device in particular having a tensioning device which exerts a spring force on the endless cleaning element.
  • a torque transmission can take place between the roller parts.
  • the endless cleaning element also consists in most cases of a flexible material, for example a fleece or the like, it is advantageous to continuously exert a spring force on the endless cleaning element.
  • the cleaning device thus advantageously has a tensioning device which exerts this spring force on the endless cleaning element.
  • the clamping device can be assigned to a roller part, for example, in that the axis of rotation of the roller part can be displaced such that the endless cleaning element is always under tension.
  • the radius of curvature of the first roller part is two to twenty times, in particular ten to fifteen times, as large as the radius of curvature of the second roller part.
  • the ratio of the radii of curvature to one another allows the ratio of the centrifugal forces acting on the respective roller parts to be set, which at the same time causes the adhering or centrifuging of dirty liquid in the region of the respective roller parts.
  • the curvature radius ratios of 10: 1 to 15: 1 which have been shown to be particularly advantageous have proven to be particularly advantageous in practice.
  • the roller part be round or drop-shaped.
  • a roller part of the cleaning device can be circular with respect to the cross section, while a second roller part is drop-shaped and thus changes the radius of curvature along its circumference.
  • the drop-shaped second roller part can have a radius of curvature with respect to one of its roller partial regions, which corresponds to the radius of curvature of the first roller part, while another roller partial region of the drop-shaped second roller part has a radius of curvature which is less than the radius of curvature of the first roller part.
  • dirty liquid is thrown off in the tapered area of the drop shape, which has the smaller radius of curvature.
  • the cleaning device is advantageously designed in such a way that the endless cleaning element, regardless of the current orientation of the drop shape, always lies tightly against the roller parts, so that rotation of the endless cleaning element is possible.
  • a difference in length of the Scope may be compensated for by means of the previously explained clamping device.
  • the second roller part have at least one action element mechanically acting on the endless cleaning element for cleaning the endless cleaning element.
  • the mechanical action element serves to support the regeneration of the endless cleaning element on the second roller part.
  • the action element is advantageously arranged on the circumference of the second roller part, so that it acts on the endless cleaning element when the endless cleaning element is displaced relative to the second roller part.
  • the action element can be a nub structure of the surface of the second roller part or the like.
  • a cleaning device 1 in the form of a wet cleaning device for wet cleaning a surface to be cleaned has a front attachment 9 which is in contact with the surface to be cleaned during a cleaning process.
  • the attachment 9 has a cleaning device 2 which has two roller parts 4, 5 which are formed separately from one another and an endless cleaning element 3 which is in the form of an endless wipe.
  • the endless cleaning element 3 is placed around the two roller parts 4, 5, so that when the roller parts 4, 5 rotate, it can circulate around an axis of rotation x from the first roller part 4 to the second roller part 5 and back.
  • the cleaning device 1 is supported on the surface to be cleaned via the first roller part 4.
  • the second roller part 5 is not in contact with the surface to be cleaned, but is offset within the attachment 9 so that contact is not possible.
  • the roller parts 4, 5 extend transversely to a usual direction of travel r of the cleaning device 1, which results from the usual working movement of a user of the cleaning device 1, namely generally alternately back and forth, this possibly further with a slight dodging into a nearby cleaning path.
  • the roller parts 4, 5 extend approximately over the entire width of the cleaning device 1, which is transverse to the direction of travel r arranged. At least one of the roller parts 4, 5 can be driven by an electric motor, ie rotatable about its axis of rotation x.
  • the attachment 9 has a tank for storing liquid for cleaning the surface to be cleaned.
  • the liquid can be filled into the tank of the attachment 9 via a filler neck 10.
  • the endless cleaning element 3 can be moistened with the liquid either from the inside by at least one roller part 4, 5, or by spraying the liquid onto the roller part 4, 5 from the outside.
  • the cleaning device 2 is not actively driven during a normal travel process of the cleaning device 1 without machining a surface to be cleaned. Rather, solely due to the frictional engagement with the surface to be cleaned, there is a passive rotation of the roller parts 4, 5, which, however, does not cause a centrifugal force which is sufficiently large for the dirty liquid to be thrown off.
  • a cleaning process of the surface by means of the first roller part 4 at least one of the roller parts 4, 5 is actively driven by means of the electric motor.
  • a wiping edge is established along the line of contact between the first roller part 4 and the surface to be cleaned. This wiping edge takes over the cleaning of the surface by the movement of the wiping edge relative to the surface, whereby dirt is loosened and conveyed onto the endless cleaning element 3 in the area of the first roller part 4.
  • FIG 2 shows a detailed view of the first roller part 4 of the cleaning device 2.
  • the first roller part 4 is shown explosively with regard to its various jackets.
  • the first roller part 4 is basically designed as a cylindrical hollow body closed on the end face, the front end closure not being shown for better illustration is.
  • the first roller part 4 can also be designed as a solid body.
  • the first roller part 4 is surrounded by a sponge body 11 arranged in a rotationally fixed manner thereon.
  • the sponge body 11 is open-pored and has the ability to temporarily store liquid.
  • the sponge body 11 is at least partially covered by the endless cleaning element 3, which connects the first roller part 4 to the second roller part 5.
  • the endless cleaning element 3 is designed here as a microfiber cloth.
  • this is rotatably arranged within the cleaning device 2, so that the portion of the endless cleaning element 3 which is in contact with the sponge body 11 changes in a circulating manner.
  • the cleaning device 2 releases liquid onto the surface to be cleaned under pressure, which is caused by a displacement of the cleaning device 1 on the surface to be cleaned. This results in an escape of liquid in the area of the wiping edge of the first roller part 4.
  • the liquid is squeezed out of the sponge body 11 and / or the endless cleaning element 3 and applied to the surface to be cleaned.
  • dirt is loosened from the surface to be cleaned and transferred to the endless cleaning element 3.
  • FIG 3 shows a first embodiment of a cleaning device 2 according to the invention.
  • the cleaning device 2 has a first roller part 4 and a second roller part 5.
  • Both roller parts 4, 5 are designed as cylindrical roller parts 4, 5, which have a radius of curvature r 1 , r 2 that is constant over their circumference.
  • the first roller part 4 has a radius of curvature r 1 which is the same size in all the roller part regions 6.
  • the second roller part 5 likewise has an equally large radius of curvature r 2 in all the roller part regions 7.
  • the radius of curvature r 1 des the first roller part 4 is approximately three times as large as the radius of curvature r 2 of the second roller part 5.
  • Both the first roller part 4 and the second roller part 5 are rotatably mounted about their respective axis of rotation x.
  • the endless cleaning element 3 is placed over the roller partial areas 6, 7 of the roller parts 4, 5, the cleaning device 2 overall forming a traction mechanism drive in which the first roller part 4 can be actively driven by means of an electric motor and the second roller part 5 by the torque transmission from the first roller part 4 passively rotates on the second roller part 5.
  • the endless cleaning element 3 is displaced relative to the cleaning device 2, so that when the cleaning device 2 acts on the surface to be cleaned, another roller part region 6 of the first roller part 4 is always on the surface to be cleaned.
  • a corresponding housing part within the cleaning device 1 is advantageously provided for collecting the thrown off dirty liquid, so that the user does not come into contact with the dirty liquid reaches and also no dirty liquid can drip onto the surface to be cleaned.
  • the Figures 4 and 5 show a second embodiment of a cleaning device 2 according to the invention, in which the second roller part 5 is drop-shaped.
  • the endless cleaning element 3 lies against the tip of the drop shape, which has a radius of curvature r 2 that is smaller than the radius of curvature r 1 of the first roller part 4, and sometimes against the opposite partial area of the drop shape, which has a radius of curvature r1 that also corresponds to corresponds to the radius of curvature r1 of the first roller part 4.
  • the liquid stored in the endless cleaning element 3 is not continuously thrown off in the region of the second roller part 5, but only when the endless cleaning element 3 just lies against the tip of the drop shape with the radius of curvature r 2 (see Figure 5 ).
  • the second roller part 5 has a tensioning device 8 which acts on the second roller part 5 with a spring force relative to its axis of rotation x.
  • the tensioning device 8 has a spring, the restoring force of which the second roller part 5 attempts to shift from the axis of rotation x in the direction of the endless cleaning element 3, the endless cleaning element 3 always remaining tensioned, regardless of the current orientation of the drop shape.
  • the cleaning device 2 can also have differently shaped roller parts 4, 5.
  • the roller parts 4, 5 can be connected to one another in a rotationally fixed manner as a one-piece roller.
  • the roller parts 4, 5 advantageously form the Shape of a drop (similar Figures 4 and 5 ), so that on the one hand a larger radius of curvature r 1 and on the other hand a smaller radius of curvature r 2 is provided.
  • the endless cleaning element 3 can be pulled over the surface of the roller parts 4, 5 by means of an electric motor, so that a frictional force arises between the endless cleaning element 3 and the roller parts 4, 5.

Landscapes

  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP16727983.5A 2015-06-22 2016-06-01 Reinigungsgerät zur einwirkung auf eine zu reinigende fläche Active EP3310235B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015109952.7A DE102015109952A1 (de) 2015-06-22 2015-06-22 Reinigungsgerät zur Einwirkung auf eine zu reinigende Fläche
PCT/EP2016/062357 WO2016206933A1 (de) 2015-06-22 2016-06-01 Reinigungsgerät zur einwirkung auf eine zu reinigende fläche

Publications (2)

Publication Number Publication Date
EP3310235A1 EP3310235A1 (de) 2018-04-25
EP3310235B1 true EP3310235B1 (de) 2019-12-25

Family

ID=56116407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16727983.5A Active EP3310235B1 (de) 2015-06-22 2016-06-01 Reinigungsgerät zur einwirkung auf eine zu reinigende fläche

Country Status (9)

Country Link
US (1) US10646092B2 (zh)
EP (1) EP3310235B1 (zh)
JP (1) JP2018518259A (zh)
CN (1) CN107750138B (zh)
DE (1) DE102015109952A1 (zh)
ES (1) ES2765979T3 (zh)
SG (1) SG11201709637XA (zh)
TW (1) TW201707633A (zh)
WO (1) WO2016206933A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI660275B (zh) * 2018-06-27 2019-05-21 廣達電腦股份有限公司 用於清潔裝置之任務區域分配方法、清潔裝置任務分配系統以及清潔裝置
CN111035329B (zh) * 2018-10-12 2021-08-03 漳州灿坤实业有限公司 自动清洁装置
CN112244487B (zh) * 2020-10-21 2021-09-14 温州职业技术学院 一种基于信息技术的计算机讲课台
CN116807315A (zh) * 2021-12-20 2023-09-29 苏州威摩尔智能科技有限公司 一种大小辊结构的清洁组件及应用其的清洁设备

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Publication number Priority date Publication date Assignee Title
US1798327A (en) * 1928-08-03 1931-03-31 Edward A Johnston Mechanical scrubber
US2953798A (en) * 1956-05-28 1960-09-27 Gen Electric Surface treating machine
JPS5545451A (en) * 1978-09-27 1980-03-31 Watanabe Asao Cleaner
US4926515A (en) * 1987-03-03 1990-05-22 Lynn William R Improved mopping system
DE60019344T2 (de) * 2000-06-12 2006-02-09 Invista Technologies S.A.R.L., Wilmington Gerät mit umlaufband zum einbringen einer reinigungsflüssigkeit in einem teppich
DE10357637A1 (de) * 2003-12-10 2005-07-07 Vorwerk & Co. Interholding Gmbh Selbstfahrendes oder zu verfahrendes Kehrgerät sowie Kombination eines Kehrgeräts mit einer Basisstation
DE202007004878U1 (de) 2007-04-03 2007-08-09 Gimpel, Emilia Gerät für gleichzeitiges Wischen und Absaugen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN107750138A (zh) 2018-03-02
JP2018518259A (ja) 2018-07-12
US20180177375A1 (en) 2018-06-28
EP3310235A1 (de) 2018-04-25
CN107750138B (zh) 2020-06-30
WO2016206933A1 (de) 2016-12-29
DE102015109952A1 (de) 2016-12-22
SG11201709637XA (en) 2017-12-28
ES2765979T3 (es) 2020-06-11
US10646092B2 (en) 2020-05-12
TW201707633A (zh) 2017-03-01

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