EP3681659A1 - Insert fileté permettant de fixer un outil dans un logement d'outil et logement d'outil doté d'un tel insert fileté - Google Patents

Insert fileté permettant de fixer un outil dans un logement d'outil et logement d'outil doté d'un tel insert fileté

Info

Publication number
EP3681659A1
EP3681659A1 EP18773359.7A EP18773359A EP3681659A1 EP 3681659 A1 EP3681659 A1 EP 3681659A1 EP 18773359 A EP18773359 A EP 18773359A EP 3681659 A1 EP3681659 A1 EP 3681659A1
Authority
EP
European Patent Office
Prior art keywords
threaded insert
receiving
tool
receiving body
threaded
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.)
Pending
Application number
EP18773359.7A
Other languages
German (de)
English (en)
Inventor
Franz Haimer
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.)
Franz Haimer Maschinenbau KG
Original Assignee
Franz Haimer Maschinenbau KG
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 Franz Haimer Maschinenbau KG filed Critical Franz Haimer Maschinenbau KG
Publication of EP3681659A1 publication Critical patent/EP3681659A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection
    • B23B31/1107—Retention by threaded connection for conical parts
    • B23B31/1122—Retention by threaded connection for conical parts using cylindrical threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/24—Cooling or lubrication means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/21—Glued connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2250/00—Compensating adverse effects during turning, boring or drilling
    • B23B2250/16—Damping of vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/113—Retention by bayonet connection

Definitions

  • Threaded insert for attaching a tool in a tool holder and tool holder with a
  • the invention relates to a threaded insert for fastening a provided with a fastening thread tool in a tool holder according to the preamble of claim 1.
  • the invention also relates to a receiving body for such a threaded insert and a tool holder with such a threaded insert and associated receiving body.
  • a tool holder with a threaded insert for holding a tool provided with a fastening thread is known.
  • To protect the thread and clamping with high concentricity of the threaded insert is arranged in a receiving body transversely to the longitudinal axis of the receiving body movable and secured by a transverse pin or a positive connection against rotation.
  • appropriate design measures are required.
  • the object of the invention is to provide a threaded insert, an associated receiving body and a horraufhahme that allow a simple and accurate installation of the threaded insert in a corresponding Adviceiiahme emotions even without complex design measures.
  • the threaded insert according to the invention has a front end side for fastening a tool provided with a fastening thread Receiving opening with an internal thread for screwing the tool on.
  • a receiving body of the threaded insert includes a tapered to a rear end insertion region with an outer bearing surface on which at least one recess for receiving an adhesive is arranged.
  • the threaded insert can be inserted with an introduced into the recess adhesive in a receiving opening of a receiving body and can be held firmly and against rotation not only by a press fit between the receiving body and the threaded insert, but also by the additional adhesive connection.
  • the threaded insert is so easy and accurate to install. If necessary, the adhesive connection can be solved for example by appropriate heating of the receiving body and the threaded insert or the receiving body can be replaced.
  • an adhesive as a non-metallic substance between two metallic surfaces has several advantages in addition to the load-transferring effect, e.g. As vibration damping, sealing against liquids and gases, compensation for different component dynamics and corrosion protection.
  • an adhesive attached to the threaded insert by surface adhesion (adhesion) and its internal strength (cohesion) in the receiving opening of a receiving body to distinguish fundamentally from the known, purely mechanical fastening method.
  • Adhesives are not or hardly used in machine tool construction and in particular in tool holders in the milling area. Due to the special design of the threaded insert and / or the receiving opening of a receiving body with recesses for receiving an adhesive but now a practically applicable solution is created for the first time.
  • An acrylate-based adhesive in particular urethane methacrylate, is preferably used.
  • the insertion region has a conical outer contour.
  • the insertion region of the threaded insert has a polygonal outer contour. Due to this non-circular shape, in addition to the positive connection and the contact force, an additional protection against unwanted rotational movement of the threaded insert.
  • the holding force on the threaded insert is further improved by an additional attachment by force and / or positive engagement is provided.
  • an additional external thread may be provided on the receiving opening of the on the ankle body facing the end of the threaded insert, which engages in a corresponding mating thread in theracöff tion of the receiving body.
  • threaded connection is only an additional attachment, that is a backup for the exceptional case.
  • the essential attachment of the threaded insert is achieved by the press fit and in particular the adhesive connection.
  • an external thread of the threaded insert may have one or preferably a plurality of locking grooves which extend spirally around the, the receiving opening of the Aufhahme stressess facing, side of the threaded insert.
  • the locking groove begins at the rear end face and has an incline, which is particularly preferably at least 40 °.
  • the receiving body in its receiving area at least one, preferably a plurality of locking elements.
  • the locking elements may be formed as one or more simple projections which engage positively in the locking grooves of the threaded insert, but particularly preferably they are helically formed in the circumferential direction protruding locking elements which are equiangularly spaced at the same height in the circumferential direction.
  • a locking groove is merely an additional attachment, that is a backup for the exceptional case.
  • the essential attachment of the threaded insert is achieved by the press fit and in particular by the adhesive connection.
  • a plurality of recesses distributed over the circumference can be arranged on the outer contact surface of the insertion region.
  • the depressions may have the shape of a shallow groove.
  • the grooves are thin and have a maximum depth of 1.5 mm, better 0.5 mm.
  • the depression or depressions can run parallel to the generatrix of the outer surface of the insertion region. But you can also run parallel to the circumference of the outer surface of the insertion or helically.
  • the flat grooves extending transversely to the axis of rotation are designed as wider recesses, which means in this context that their width is at least three times as large as the width of the axially extending grooves.
  • the threaded insert particularly preferably has four to six, in particular 5, grooves extending transversely to the axis of rotation, the width of which is chosen such that the webs remaining between the grooves have the substantially same width as the grooves. The same applies to the grooves in the receiving opening of the receiving body.
  • the depth of the grooves is at most 5/100 mm, more preferably not more than 3/100 mm.
  • the receiving opening of the receiving body has corresponding wider recesses. It is particularly provided that the recesses of the threaded insert and the receiving body come to rest on each other and thus create a special receiving space for the adhesive. In this embodiment, it is further provided that both the threaded insert and the receiving opening have at least five such transverse to the axis of rotation recesses.
  • the receiving opening between the tool-side front end face and the internal thread may include an outer bearing area with a first conical bearing surface and a second conical bearing surface.
  • the first and second conical bearing surface of the outer bearing area preferably have significantly different cone angles.
  • an inner support region with a plurality of circumferentially spaced apart and radially inwardly projecting, web-shaped support elements can be arranged on the threaded insert between an inner end of the receiving opening and the inner thread. Through this inner support area, the tool can be additionally centered and radially damped.
  • the threaded insert also contains a through hole through which a coolant or other working fluid can be passed to the tool or the processing area.
  • a designed for such a threaded insert receiving body of a tool holder according to the invention is characterized by a long and slender receiving area in which a to an input on a front end side of the receiving area towards expanding receiving opening for receiving the threaded insert is arranged.
  • a core of a heavy and stable material preferably made of heavy metal whose density is greater than that of steel.
  • the core may e.g. be formed tubular and expediently has a central passageway.
  • the core may be inserted into a slimmer middle part of a central passage opening of the receiving body.
  • the core can rest completely on the sides of the central passage opening, or be held by enclosing damping elements in the central passage opening and spaced therefrom.
  • the invention also relates to a tool holder with a receiving body described above and an associated threaded insert.
  • the receiving opening of the receiving body and the insertion of the threaded insert are adapted to each other so that in the mounting position of the threaded insert between the tool-side end of the receiving area and an annular surface on the threaded insert remains a distance.
  • a sealing element which bridges the distance between the tool-side end of the receiving area and an annular surface on the threaded insert ,
  • This sealing element may be formed one or more channels depending on the configuration of the through-channel. In particular, it is provided that the sealing element protrudes into an opening formed in the threaded insert.
  • the seal preferably has a passageway which is coaxial with the passageway.
  • the coolant or lubricant can be transported with particularly low friction.
  • the diameter of the passage channel corresponds to the diameter of the supply channel, so that there is no cross-sectional enlargement in the channels and the coolant and / or lubricant can be transported without recirculation and Auskondenstechnik.
  • the diameter of the threaded insert can also narrow in order to ensure a constant pressure on the coolant and / or lubricant through such a bottleneck.
  • the sealing element is preferably made of an elastic material, such as a highly elastic polyurethane elastomer product.
  • an elastic material such as a highly elastic polyurethane elastomer product.
  • any other deformable material is conceivable, for example aluminum, lead, copper, soft iron and the like. It is also possible to use memory material.
  • Such a sealing element may preferably also be provided in the receiving opening for the tool provided with a fastening thread in order to seal the passage of coolant and / or lubricant here as well.
  • FIG. 1 shows a first embodiment of a tool holder with a threaded insert in a longitudinal section.
  • FIG. 2 is an enlarged partial view of the tool holder of FIG. 1;
  • FIG. 3 shows a threaded insert in a perspective;
  • FIG. 4 shows a second embodiment of a tool holder with a threaded insert in a longitudinal section.
  • FIG. 5 shows the threaded insert shown in FIG. 4 in a perspective
  • Fig. 6 shows another embodiment with vertical and horizontal recesses and locking grooves
  • Figure 7 shows another embodiment with vertical and horizontal recesses and external thread.
  • Fig. 8 shows a further embodiment with inserted sealing element
  • Fig. 9a, b, c detail views of various embodiments of the sealing element.
  • the receiving body 1 shows a tool holder 1 with a rotationally symmetrical Aumahme Sciences 2 and a fixed in the receiving body 2 threaded insert 3 for holding a tool provided with a fastening thread.
  • the receiving body 2 has a long and slender front receiving area 4 and a rear clamping area 5 arranged at the top in FIG. 1 for holding the receiving body in a work spindle of a machine tool.
  • the machine-side clamping region 5 as HSK interface with a conical outer clamping surface 6 for receiving in a corresponding inner cone of the work spindle of a machine tool or the like.
  • the interface at the rear end of the Aufhahme stressess 2 can also be designed as SK, JIS, BT, ABS, Capto or other suitable interface.
  • the one for reinforcement and Vibration damping of the long and slender receiving portion 4 serving core 9 is inserted into a slimmer middle part of a central through hole 10 of the receiving body 2.
  • a conical receiving opening 12 for receiving the threaded insert 3, which widens toward an input 11 on the front end face 7 of the receiving area 4, is provided.
  • FIG. 2 shows particularly clearly that the threaded insert 3 contains a plug-in region 13 which is adapted to the receiving opening 12 of the receiving body 2 and which tapers towards a rear end side 26 facing the tool holder 1.
  • the insertion region 13 has an outer contact surface 14.
  • the threaded insert 3 also includes a front receiving portion 15 with a receiving opening 16 for attachment of a threaded tool.
  • the receiving opening 16 has an internal thread 17.
  • the insertion region 13 has a conical outer contour with a conical outer contact surface 14.
  • the conical on ahmeö réelle 12 of the receiving body 2 and the insertion portion 13 of the threaded insert 3 are adapted to each other, that in the mounting position of the threaded insert 2 between the tool-side end face 7 of the receiving body 2 and an annular surface 18 at the transition from the insertion region 13 to the receiving region 15 of the threaded insert 3 a distance 19 remains. As a result, no axial bias between the receiving body 2 and the threaded insert 3 is generated.
  • the receiving opening 16 has an outer bearing area with a first conical bearing surface 21 and a second conical bearing surface 22 for the installation of corresponding guide surfaces on the tool.
  • the conical bearing surfaces 21 and 22 have different cone angles.
  • the first conical bearing surface 21 has for example a relatively large cone angle between 140 ° and 179 °, preferably 170 °, while the second conical bearing surface 22 a comparatively smaller cone angle between 1 ° and 90 °, preferably 10 °.
  • a double cone of the type described has the advantage that the smaller cone angle allows good centering of the tool on the threaded insert 3 and the large cone angle an additional support and centering.
  • the cone angle is to be understood as meaning the opening angle of the cone formed by the conical bearing surfaces 21 and 22.
  • an inner bearing area with a plurality of circumferentially spaced, radially inwardly projecting, web-shaped Aufiage instituten 23 is provided between an inner end of Aufiiahmeöffiiung 16 and the internal thread 17, an inner bearing area with a plurality of circumferentially spaced, radially inwardly projecting, web-shaped Aufiage instituten 23 is provided.
  • the tool is additionally centered and guided radially damped within the Aufiiahmeöffiiung 16.
  • An example of the embodiment of the Aufiiahmeöffiiung 16 and the execution of an associated tool is described in DE 10 2015 112 079 AI. Its contents are referred to in their entirety.
  • a coolant or other working fluid can be passed to the tool.
  • a plurality of indentations 25 for receiving an adhesive are arranged on the conical outer surface 14 on the conical insertion region 13 of the threaded insert 3.
  • adhesive can be introduced into the recesses 25.
  • the threaded insert 3 can be held firmly and against rotation not only by a press fit between the receiving body 2 and the threaded insert 3, but also by the additional adhesive connection.
  • the adhesive compound may be e.g. solved by appropriate heating of the Aufhahme stressess 2 and so the threaded insert 3 or the Aufhahme Sciences 2 are replaced.
  • the recesses 25 may preferably extend parallel to the generatrices of the conical outer surface 14.
  • the threaded insert 3 can also be soldered to the receiving body 2 or connected in a materially cohesive manner.
  • FIGS. 4 and 5 show a further exemplary embodiment of a tool holder 1 with a rotationally symmetrical receiving body 2 and a threaded insert 3 fastened in the receiving body 2 for holding a tool provided with a fastening thread.
  • This embodiment differs from the previous embodiment in that there is a gap between the outside of the core 9 and the inner wall of the central through hole 10.
  • annular damping elements 27 of the core 9 is held in the receiving body 2.
  • the insertion region 13 of the threaded insert 3 here has a polygonal outer contour.
  • the Consöff 12 in the receiving body 2 is adapted to the outer contour of the insertion portion 13 on the threaded insert 3 and accordingly has a polygonal inner contour.
  • FIG. 6 also shows depressions 28 running longitudinally of the axis of rotation and transverse to the axis of rotation.
  • the receiving region 4 of the receiving body 2 has correspondingly smaller recesses (not shown here). It is particularly provided that the horizontally extending recesses 28 of the threaded insert 3 and the receiving body 2 come to rest on each other and thus create a special receiving space for the adhesive. In this embodiment, it is further provided that both the threaded insert and the Qualcommöffhung have at least five such horizontally extending recesses 28.
  • a plurality of locking grooves 30 are formed in this exemplary embodiment.
  • the threaded insert 3 of Figure 7 is similar to that shown in Figure 6.
  • an external thread 29 is formed, in the specific case is a trapezoidal thread, but it could also find a needle thread use.
  • FIG. 8 shows the tool holder 1 with receiving body 2 and threaded insert 3, which is essentially already known from FIG. 1.
  • both the passage 8 and the sealing element 31 are formed einkanalig.
  • the sealing element 31 may be formed Stationary Artifacts.
  • FIGS. 9 a, 9 b, 9 c each show various possible embodiments of the sealing element 31.
  • FIG. 9a shows a sealing element 31, the outer diameter of which widens on the side toward the threaded insert 3 in order to anchor itself there in an opening provided for this purpose.
  • the sealing element 31 shown in FIG. 9b has, in addition to the enlargement of the outer diameter shown in FIG. 9a, an additionally enlarged outer diameter on the side facing the core 9. However, this additionally enlarged outer diameter does not engage in a recess, but acts as a kind of flange on the front side of the core 9.
  • FIG. 9c Another embodiment of the sealing element 31 is shown in FIG. 9c.
  • the sealing element 31 is disc-shaped and lies with its end faces over the entire surface both on the core 9 and on the sealing element 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)
  • Gripping On Spindles (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

L'invention concerne un insert fileté (3) permettant de fixer un outil pourvu d'un filetage de fixation dans un logement d'outil (1), l'insert fileté (3) comprenant sur une face d'extrémité (20) avant une ouverture de logement (16) dotée d'un filetage femelle (17) pour visser l'outil. Selon l'invention, l'insert fileté (3) comporte une zone d'insertion (13) se rétrécissant vers une face d'extrémité (26) arrière dotée d'une surface de contact (14) externe et, sur la surface de contact (14) externe, au moins une cavité (25), destinée à recevoir un adhésif, est disposée. L'invention concerne en outre un corps de logement pour un tel insert fileté et un logement d'outil doté d'un tel insert fileté et du corps de logement associé.
EP18773359.7A 2017-09-14 2018-09-11 Insert fileté permettant de fixer un outil dans un logement d'outil et logement d'outil doté d'un tel insert fileté Pending EP3681659A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017121363.5A DE102017121363A1 (de) 2017-09-14 2017-09-14 Gewindeeinsatz zur Befestigung eines Werkzeugs in einer Werkzeugaufnahme und Werkzeugaufnahme mit einem derartigen Gewindeeinsatz
PCT/EP2018/074389 WO2019052982A1 (fr) 2017-09-14 2018-09-11 Insert fileté permettant de fixer un outil dans un logement d'outil et logement d'outil doté d'un tel insert fileté

Publications (1)

Publication Number Publication Date
EP3681659A1 true EP3681659A1 (fr) 2020-07-22

Family

ID=63667863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18773359.7A Pending EP3681659A1 (fr) 2017-09-14 2018-09-11 Insert fileté permettant de fixer un outil dans un logement d'outil et logement d'outil doté d'un tel insert fileté

Country Status (7)

Country Link
US (1) US11358228B2 (fr)
EP (1) EP3681659A1 (fr)
JP (1) JP7280867B2 (fr)
KR (1) KR102546330B1 (fr)
CN (1) CN111093869A (fr)
DE (1) DE102017121363A1 (fr)
WO (1) WO2019052982A1 (fr)

Family Cites Families (25)

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DE1400906A1 (de) * 1963-11-29 1968-12-05 Scharmann & Co Klebverbindung an ganz oder teilweise ineinandersteckbaren Maschinenteilen od.dgl.
JPS5023164Y1 (fr) * 1969-05-10 1975-07-12
FR2602162B1 (fr) * 1986-08-01 1990-03-23 Begue Pierre Systeme de fixation d'un outil sur un organe porte-outil de machine-outil, parties constitutives
DE4014381A1 (de) * 1989-11-29 1991-11-07 Felix Leeb Werkzeug zur wahlweisen herstellung von ausnehmungen, bohrungen oder gewindebohrungen im vollen material
JPH07227711A (ja) * 1994-02-21 1995-08-29 Mitsubishi Heavy Ind Ltd エンドミル
US5601494A (en) * 1994-05-31 1997-02-11 Dana Corporation End fitting having adhesive channels for drive shaft assembly
JPH08155774A (ja) * 1994-12-01 1996-06-18 Toshiba Mach Co Ltd 工具保持装置
US6254303B1 (en) * 1999-02-01 2001-07-03 Bogdan S. Falat Quick-release connector and methods therefore
IL137316A (en) * 2000-07-16 2004-01-04 Iscar Ltd Cutting Tools
US6565291B2 (en) 2000-08-18 2003-05-20 Iscar, Ltd. Cutting tool assembly
JP2003136354A (ja) * 2001-11-01 2003-05-14 Big Alpha Co Ltd 工具ホルダ
US20060043684A1 (en) * 2004-08-31 2006-03-02 Medtronic, Inc. Surgical instrument with locking element
DE102005031683A1 (de) 2005-07-05 2007-01-25 Dihart Ag Maschinenwerkzeug
DE102010008873A1 (de) * 2009-06-24 2010-12-30 Gühring Ohg Vorrichtung zur Abdichtung
DE102010015934A1 (de) * 2010-03-11 2011-09-15 Gühring Ohg Schnittstelle zur verdrehsicheren Ankopplung eines Werkzeugschafts an einen Werkzeug-Spannmodul, Komponenten zur Ausbildung der Schnittstelle und Verfahren zur Herstellung der Schnittstelle
US9827620B2 (en) * 2010-09-29 2017-11-28 Mitsubishi Materials Corporation Head replacement-type cutting tool
DE102011010897B4 (de) 2011-02-10 2023-02-09 Gebr. Brasseler Gmbh & Co. Kg Dentalinstrument sowie Verfahren zu dessen Herstellung
DE102011012144B4 (de) * 2011-02-24 2015-04-23 Kennametal Inc. Werkzeughalter sowie Werkzeugsystem mit einem Werkzeughalter und einem Werkzeug
DE102012100976B4 (de) 2012-02-07 2014-04-24 Franz Haimer Maschinenbau Kg Einschraubwerkzeug und Werkzeugaufnahme für ein derartiges Einschraubwerkzeug
DE102012104606B4 (de) 2012-05-29 2015-11-19 Franz Haimer Maschinenbau Kg Werkzeugaufnahme für ein Einschraubwerkzeug
DE102013103427A1 (de) * 2013-04-05 2014-10-23 Franz Haimer Maschinenbau Kg Werkzeugaufnahme
DE102013108209B3 (de) 2013-07-31 2014-12-11 Haimer Gmbh Werkzeugaufnahme
US9468977B2 (en) * 2014-02-18 2016-10-18 Kennametal Inc. Cylindrical grinding process and as-ground part resulting from such process
DE102015112079A1 (de) 2015-07-24 2017-01-26 Franz Haimer Maschinenbau Kg Einschraubwerkzeug und Werkzeugaufnahme mit unterteiltem Stützbereich
AU2017379926A1 (en) * 2016-12-20 2018-09-27 J.H. Fletcher & Co. Mine drill system with adapter

Also Published As

Publication number Publication date
WO2019052982A1 (fr) 2019-03-21
JP2020533184A (ja) 2020-11-19
CN111093869A (zh) 2020-05-01
JP7280867B2 (ja) 2023-05-24
US20200276651A1 (en) 2020-09-03
DE102017121363A1 (de) 2019-03-14
US11358228B2 (en) 2022-06-14
KR20200054234A (ko) 2020-05-19
KR102546330B1 (ko) 2023-06-20

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