WO2007069946A1 - Machine de travail portative - Google Patents

Machine de travail portative Download PDF

Info

Publication number
WO2007069946A1
WO2007069946A1 PCT/SE2005/001913 SE2005001913W WO2007069946A1 WO 2007069946 A1 WO2007069946 A1 WO 2007069946A1 SE 2005001913 W SE2005001913 W SE 2005001913W WO 2007069946 A1 WO2007069946 A1 WO 2007069946A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
machine according
vibration element
tool arm
engine
Prior art date
Application number
PCT/SE2005/001913
Other languages
English (en)
Inventor
Magnus SÖDERQVIST
Original Assignee
Husqvarna Ab
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 Husqvarna Ab filed Critical Husqvarna Ab
Priority to PCT/SE2005/001913 priority Critical patent/WO2007069946A1/fr
Priority to EP05821992A priority patent/EP1960143A1/fr
Publication of WO2007069946A1 publication Critical patent/WO2007069946A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/005—Vibration-damping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/0033—Devices for attenuation of vibrations

Definitions

  • the present invention relates to an engine powered, portable, hand-held working machine including a machine body and an engine in the machine body, a tool arm connected at its first end to the machine body and the second end of the tool arm having a blade holder being able to hold and rotate a rotational cutter blade, the tool arm including means to transfer power from the engine to the blade holder, an arched protective cover defining a maximum radius limiting the possible blade radius of the attachable rotational cutter blade, both radiuses starting from the rotational centre of the attachable rotational cutter blade, the hand-held working machine further including a handle assembly comprising a handle and a handle body, the machine body and the cutting unit are suspended in the handle assembly via a number of anti-vibrations elements.
  • Vibrations are a severe problem in connection with engine powered, portable, hand-held working machines in general, and this is particularly true as far as cut-off machines, also referred to as power cutters, are concerned.
  • Such machines include a rotational cutting blade, which in operation may cause vibrations adding to the vibrations generated by the engine.
  • Similar problems exist also in connection with other engine powered working machines, such as chain saws.
  • the handle system and the anti-vibration elements are designed to give as low vibration levels and comfortable usage as possible.
  • the maximum amount of movement that is possible is limited for a number of technical reasons.
  • the vibration characteristics in the lateral direction, the vertical direction and the horizontal direction are different and hence it is desirable that the anti-vibrations elements can behave different in the respective directions.
  • the movement of the crank shafts will transfer vibration in the vertical direction (of course assuming that the crank shafts are arranged to move vertically up and down).
  • the rotational cutting blade causes vibrations as it rotates and when it cut a material.
  • the vibrations in the lateral direction are far lower than the horizontal and vertical directions and therefore the suspension in the lateral direction may be limited and at least some rigidity in the lateral direction is needed in order for the rotational cutter blade to be controllable.
  • the stiffness of the anti- vibration elements must be so large that their maximum suspension in the vertical and horizontal directions will hardly be overcome during work conditions.
  • an anti-vibration element and an arrangement of the anti-vibration element that eliminates or at least minimizes some of the disadvantages mentioned above, this is achieved by presenting an engine powered, portable, hand-held working machine including a machine body and an engine in the machine body, a tool arm secured at its first end section to the machine body and the second end of the tool arm having a blade holder being able to hold and rotate a rotational cutter blade, the tool arm including means to transfer power from the engine to the blade holder, an arched protective cover defining a blade region having a maximum radius limiting the possible blade radius of the attachable rotational cutter blade, both radiuses starting from the rotational centre of the attachable rotational cutter blade, the hand-held working machine further including a handle assembly comprising a front handle and a handle body, the machine body with the tool arm being suspended in the handle assembly via a number of anti-vibrations elements, each anti-vibrations elements having a first end section, a second end section and an intermediate
  • the position of the vibration dampening is moved forward closer to the where the rotational blade contacts the material subjected to cutting, i.e. the major vibration source during operation of the hand-held working machine. This drastically reduces the vibrations for the user of the hand-held working machine which of course is highly beneficial.
  • the intermediate section of the first anti-vibration element is within the blade region.
  • the first end section of the first anti-vibration element is within the blade region.
  • the second end section of the first anti-vibration element is within the blade region.
  • the blade region is limited by a second radius which second radius is less than 200 mm, the second radius starting from the rotational centre of the attachable rotational cutter blade, preferably the second radius is less than
  • the second radius is less than 100 mm.
  • the first end section of the first anti-vibration element is secured to the tool arm, preferably the lower side of the tool arm.
  • the second end section of the first anti-vibration element is secured to a protruding part, protruding from the handle assembly into the blade region, preferably from the lower end of the handle assembly, thereby enabling the first anti-vibration element to be arranged within the blade region.
  • the blade region is further limited to the area covered by the protective cover, thereby protecting the anti-vibration element from interference with the rotational cutter blade.
  • the first anti-vibration element can be a flat plate spring, providing an economic and efficient anti-vibration element, where the plate spring may consist of a piece of 1-2 mm thick spring steel, and where the width extension of the plate spring may project in a direction coinciding with the direction of the rotational axle of the blade holder providing the advantage of stabilising the rotational cutter blade in its lateral direction and dampening the vibration in the plane of the rotational cutter blade, and where the plate spring may form an arch in the horizontal direction, and where the plate spring may protrude parallel to the tool arm in the horizontal direction.
  • the plate spring may consist of a piece of 1-2 mm thick spring steel, and where the width extension of the plate spring may project in a direction coinciding with the direction of the rotational axle of the blade holder providing the advantage of stabilising the rotational cutter blade in its lateral direction and dampening the vibration in the plane of the rotational cutter blade, and where the plate spring may form an arch in the horizontal direction, and where the plate spring may protrude parallel to the tool arm
  • the first anti-vibration element can be a a coil spring.
  • the first anti-vibration element can be a resilient rubber spring.
  • the engine can be a combustion engine.
  • the engine can be one from the set of electric, pneumatic or hydraulic engine.
  • Figure 1 is a right-hand side view of a hand-held working machine having a most forward anti-vibration element according to the preferred embodiment of the present invention
  • Figure 2 is perspective view from bottom side and the left-hand side of a hand-held working machine according to the preferred embodiment of the present invention
  • Figure 3 shows a perspective view of the front handle and the handle body of the hand-held working machine and a number of anti-vibration elements
  • Figure 4 shows an alternative embodiment of the most forwards anti-vibration element
  • Figure 5 shows two further embodiments of the most forwards anti-vibration element.
  • FIG. 1 shows the right hand side of the hand-held working machine 1.
  • the hand-held working machine 1 includes a machine body 2 with an engine in the machine body 2.
  • a tool arm 4a, 4b is secured at its first end section to the machine body 2.
  • the second end of the tool arm 4a, 4b has a blade holder 3 (see figure 2).
  • the blade holder 3 is able to hold and rotate a rotational cutter blade 5.
  • the tool arm 4a, 4b including means to transfer power from the engine to the blade holder 3 and thereby to the rotational cutter blade 5, preferably by having a chain or a driving belt within the tool arm 4a, 4b linking the engine to the blade holder 3.
  • the tool arm 4a, 4b of figure 1 has a fixed part 4a fixed to the machine body 2 and a moveable part 4b having the blade holder 3, the moveable part 4b can be moved in the horizontal direction in order to stretch the driving belt.
  • the fixed party 4a having a tool arm mounting 4c at the lower end of the fixed part 4a close to where the moveable part 4b starts.
  • An arched protective cover 8 partly covers the rotational cutter blade 5.
  • the arched protective cover defines blade region having a maximum radius Rmax limiting the possible blade radius Rl of the rotational cutter blade 5.
  • the hand-held working machine 1 further includes a handle assembly 6, 7 comprising a front handle 6 and a handle body 7.
  • the front handle 6 having a right portion 6a at the right hand side of the machine 1, a top portion 6b above the machine, a left portion 6c at the left side of the machine 1 and a bottom portion 6d at the lower front side of the handle body 7.
  • the right end portion of the front handle 6 is secured to the handle body 7 at its right hand side and the bottom portion of the front handle 6 is secured to the lower front side of the handle body 7.
  • the handle body comprises a back grip 7a having a throttle adjuster 10.
  • the machine body 2 with the tool arm 4a, 4b is suspended in the handle assembly 6, 7 via a first anti-vibrations element 11, a second anti-vibrations element 12, a third anti- vibrations element 13 and a forth anti-vibration element 14.
  • Each anti-vibration element 11, 12, 13 and 14 has a first end section, a second end section and an intermediate flexible section.
  • a protruding part 9 protrudes from the lower front side of the handle body 7, at the right hand side of the hand-held working machine 1, to within a blade region limited by the maximum radius Rmax.
  • the protruding part 9 has a first end 9a and a second end 9b.
  • the first end 9a of the protruding part 9 is secured to the handle body 7 and the second end is within the blade region.
  • the protruding part 9 is aligned to the tool arm 4a, 4b in the lateral direction.
  • the circular holes in the protruding part 9, seen in the figures, are for reducing the weight of the protruding part 9 while maintaining its strength.
  • the first anti- vibration element 11 designed and arranged according to the invention, is secured between the second end 9b of the protruding part 9 and the lower side of the tool arm 4a, 4b at the tool arm mounting 4c, the tool arm mounting 4c preferably as close as possible to the second end of the tool arm 4a, 4b and the tool arm mounting 4c preferably at the fixed part 4a of the tool arm 4a, 4b.
  • the first anti-vibration element ll has a first end section 11a, a second end section li b and an intermediate flexible section lie, where the first end section 11a is secured to the tool arm 4a, 4b and the second end section lib is secured to the protruding part 9.
  • the first anti- vibration element 11 is preferably an arched flat spring plate, where the arch points forward in the horizontal direction, i.e. the intermediate section lie of the spring plate 11 is further forward than its end sections 11a, lib.
  • the width extension of the flat spring plate 11 projects in the lateral direction.
  • the flat spring plate 11 is preferably made of spring steel.
  • the length of the spring plate 11 is preferably in the range of 50-200 mm, the width is preferably in the range of 5-30 mm, and the thickness is preferably in the range of 0,5 - 3 mm, and most preferably 1-2 mm.
  • the spring characteristics of the spring plate can be controlled in the vertical direction, the horizontal direction and the lateral direction; by changing the dimensions of the spring plate 11, e.g.
  • the spring plate 11 could be made to have varying thickness over its length or width and varying width over its length in order to further control the spring characteristics.
  • the second anti-vibration element 12 is secured between right portion of the front handle 6 and the upper right side of the machine body 2 (the second anti-vibration element 12 is hidden by the front handle 6 in figure 1 but can be seen in figure 3).
  • the third anti- vibration element 13 (see figure 2 and figure 3) is secured between the lower left side of the handle body 7 and the lower left side of the machine body 2.
  • the forth anti-vibration element 14 (see figure 3) is secured between the upper part of the handle body 7 and the back part of the machine body 2.
  • Figure 3 shows a perspective view of a handle assembly, the front handle 6 and the handle body 7, and the anti-vibration elements 11, 12, 13, 14 and 15.
  • the handle assembly 6, 7 is the same as used in the hand-held working machine 1 of figure 1 and 2, according to the invention, but for the additional anti- vibration element 15.
  • the additional anti- vibration element 15 shows a typical most-forward-placed anti-vibration element according to the prior art. According to the preferred embodiment of the invention the additional anti- vibration element 15 in figure 3, is removed and replaced by the first anti-vibration element 11. I.e. in the preferred embodiment the most-forward-placed anti- vibration element is moved further forward closer to the rotational centre of the rotational cutter blade 5 a.
  • the fixed part 4a of the tool arm 4a, 4 has been prolonged at its lower end to further extend in the horizontal direction towards the rotational centre of the rotational cutter blade 5.
  • the tool arm mounting 4c at the tool arm 4a, 4b can be moved further forward compared to the mounting 4c in figure 1.
  • the fist anti-vibration element 11 ' shown in figure 4 is also a flat spring plate, but not forming an arch as the fist anti- vibration element 11 of figure 1-3, having its first end section 1 Ia' at the tool arm mounting 4c most forward followed by the intermediate section l ie' and finally the second end section lib' secured to the protruding part 9 being most backwardly arranged.
  • Figure 5 shows the front part of the hand held working machine 1 where two alternative anti- vibration elements are shown, a coil spring 11'" and a rubber spring 11".
  • the coil spring 11'" and the rubber spring 11" both preferably having their respectively length extension in the lateral direction, i.e. being more rigid in the lateral direction.
  • the machine body 2 with the tool arm 4a, 4b could be suspended by fewer anti- vibrations elements than by the above described four anti- vibration elements, in fact many hand-held working machines are commonly suspended by three anti-vibration elements but it would also be possible to use only two anti-vibration elements.
  • the invention concerns how to design and arrange the most forward anti-vibration element, the first anti-vibration element 11, and not the possible arrangements of other anti- vibrations elements, e.g. anti-vibration elements 12, 13 and 14.
  • the main idea of the invention is to move the most forward anti-vibration element closer to rotational centre of the rotational cutter blade 5.
  • the invention is presented with a plate spring as the first-anti vibration elements, other anti-vibration elements could of course be used, for example different kinds of springs, resilient rubber spring, coil springs and many other anti-vibration elements imaginable by the skilled person.
  • the plate spring could also be made of another suitable metallic material or can be made of a plastic material, e.g. glass fibre or carbon fibre reinforced plastic.
  • the hand-held working machine 1 is shown with a rotational cutter blade 5 having a radius Rl almost the same as the maximum radius Rmax, a rotational cutter blade 5 having a smaller radius Rl could of course be used. It is also obvious that the hand-held working machine 1 could be sold without the rotational cutter blade 5 since the rotational cutter blade 5 is commonly an interchangeable part due to wear out.
  • the arched protective cover 8 could have a polygonal shape still having a maximum radius Rmax in the sense of the maximum possible size of a rotational cutter blade 5 inserted in the blade holder 3 and limited by the protective cover 8.
  • the protruding part 9 protrudes from the lower front side of the handle body 7 at the right-hand side of the hand-held working machine 1.
  • the protruding part 9 could be arranged on the left hand side of the hand-held working machine 1, protruding from either the handle body 7 or the front handle 6, and the anti- vibration element 11 could be likewise be arranged between the second end 9b and the blade holder 3 or the protective cover 8.
  • the anti- vibration element 11 could be secured closer to the end of the tool arm 4a, 4b, preferably as close as possible to the rotational centre of the rotational blade 5.
  • protruding part 9 could be secured at the front handle 6, protruding into the blade region, in the area above the tool arm 4a, 4b and thereby having an anti- vibration element 11 secured between the protruding part 9 and the upper part of the tool arm 4a, 4b.
  • tool arm 4a, 4b could consist of only a fixed part 4a, where the driving belt is stretched by other measures, enabling the first anti- vibration element 11 to be secured anywhere on the tool arm 4a, 4b.
  • hand-held machine 1 could also have another type of engine, such as electric, hydraulic or pneumatic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Harvester Elements (AREA)

Abstract

Machine de travail (1), portable, tenue à la main, motorisée, comprenant un corps (2) de machine et un moteur dans le corps (2) de machine, un bras d'outil (4a, 4b) fixé par sa première extrémité au corps (2) de machine, sa seconde extrémité comprenant un porte lame(3) apte à maintenir et à entraîner en rotation une lame de coupe (5) rotative, le bras d'outil (4a, 4b) comprenant un moyen de transmission de la puissance du moteur au porte lame (3), un carter de protection courbe (8) définissant une région de lame présentant un rayon maximum (Rmax) limitant le rayon de lame possible (Rl) de la lame de coupe (5) rotative amovible, les deux rayons (Rmax, Rl) partant du centre de rotation de la lame de coupe (5) rotative amovible, la machine de travail (1) portative comprenant également un ensemble poignée (6, 7), comprenant une poignée avant (6) et un corps (7) de poignée, le corps (2) de machine, avec le bras d'outil (4a, 4b), étant suspendus dans l'ensemble poignée (6, 7) au moyen d'un nombre d'éléments (11, 12, 13) anti-vibratoires, chaque élément anti-vibratoire (11, 12, 13) comprenant une première extrémité (Ha), une seconde extrémité (lib) et une partie flexible intermédiaire (llc), au moins une partie d'un des éléments anti-vibratoires (11, 12, 13), le premier élément (11) anti-vibratoire, étant située dans la région de la lame (Rmax).
PCT/SE2005/001913 2005-12-14 2005-12-14 Machine de travail portative WO2007069946A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/SE2005/001913 WO2007069946A1 (fr) 2005-12-14 2005-12-14 Machine de travail portative
EP05821992A EP1960143A1 (fr) 2005-12-14 2005-12-14 Machine de travail portative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2005/001913 WO2007069946A1 (fr) 2005-12-14 2005-12-14 Machine de travail portative

Publications (1)

Publication Number Publication Date
WO2007069946A1 true WO2007069946A1 (fr) 2007-06-21

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ID=38163166

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/001913 WO2007069946A1 (fr) 2005-12-14 2005-12-14 Machine de travail portative

Country Status (2)

Country Link
EP (1) EP1960143A1 (fr)
WO (1) WO2007069946A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010068214A1 (fr) * 2008-12-11 2010-06-17 Husqvarna Consumer Outdoor Products N.A.,Inc. Poignée en porte-à-faux anti-vibrations pour un appareil de soufflage
CN102615575A (zh) * 2011-01-26 2012-08-01 株式会社牧田 装有马达的加工工具
WO2013187837A3 (fr) * 2012-06-12 2014-02-20 Husqvarna Ab Système de coupe électrique
WO2016150518A1 (fr) * 2015-03-26 2016-09-29 Husqvarna Ab Agencement de tête de scie à moteur visible
EP3733352A1 (fr) * 2019-04-29 2020-11-04 Hilti Aktiengesellschaft Dispositif de protection pour un appareil-outil ainsi que système comprenant un dispositif de protection et un appareil-outil
EP4008466A1 (fr) * 2020-12-04 2022-06-08 Hilti Aktiengesellschaft Machine-outil doté d'un outil en forme de disque et d'une tôle de protection destinée à la protection contre le vol d'étincelles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3922552A1 (de) * 1989-07-08 1991-01-17 Licentia Gmbh Handgefuehrtes elektrowerkzeug
US5046566A (en) * 1989-03-18 1991-09-10 Andreas Stihl Portable handheld tool having a handle arrangement decoupled by antivibration elements
DE4416044A1 (de) * 1994-05-03 1995-11-09 Fraunhofer Ges Forschung Schwingungsdämpfende Lagerung für motorgetriebene, handgehaltene Geräte
US20050224244A1 (en) * 2000-06-15 2005-10-13 Ernst Kraenzler Hand machine tool comprising at least one handle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5046566A (en) * 1989-03-18 1991-09-10 Andreas Stihl Portable handheld tool having a handle arrangement decoupled by antivibration elements
DE3922552A1 (de) * 1989-07-08 1991-01-17 Licentia Gmbh Handgefuehrtes elektrowerkzeug
DE4416044A1 (de) * 1994-05-03 1995-11-09 Fraunhofer Ges Forschung Schwingungsdämpfende Lagerung für motorgetriebene, handgehaltene Geräte
US20050224244A1 (en) * 2000-06-15 2005-10-13 Ernst Kraenzler Hand machine tool comprising at least one handle

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8756754B2 (en) 2008-12-11 2014-06-24 Husqvarna Ab Anti-vibration cantilevered handle for a blowing apparatus
WO2010068214A1 (fr) * 2008-12-11 2010-06-17 Husqvarna Consumer Outdoor Products N.A.,Inc. Poignée en porte-à-faux anti-vibrations pour un appareil de soufflage
CN102615575A (zh) * 2011-01-26 2012-08-01 株式会社牧田 装有马达的加工工具
EP2481527A1 (fr) * 2011-01-26 2012-08-01 Makita Corporation Appareil de travail motorisé
US9174290B2 (en) 2011-01-26 2015-11-03 Makita Corporation Motorized working tool
US10486250B2 (en) 2012-06-12 2019-11-26 Husqvarna Ab Electric cutting system
WO2013187837A3 (fr) * 2012-06-12 2014-02-20 Husqvarna Ab Système de coupe électrique
CN104582886A (zh) * 2012-06-12 2015-04-29 胡斯华纳有限公司 电动切割系统
JP2015523226A (ja) * 2012-06-12 2015-08-13 フスクバルナ アクティエボラーグ 電動式切断システム
US9656336B2 (en) 2012-06-12 2017-05-23 Husqvarna Ab Electric cutting system
CN104582886B (zh) * 2012-06-12 2019-03-01 胡斯华纳有限公司 电动切割系统
WO2016150518A1 (fr) * 2015-03-26 2016-09-29 Husqvarna Ab Agencement de tête de scie à moteur visible
US10843324B2 (en) 2015-03-26 2020-11-24 Husqvarna Ab Visible motor saw head layout
EP3733352A1 (fr) * 2019-04-29 2020-11-04 Hilti Aktiengesellschaft Dispositif de protection pour un appareil-outil ainsi que système comprenant un dispositif de protection et un appareil-outil
WO2020221471A1 (fr) * 2019-04-29 2020-11-05 Hilti Aktiengesellschaft Dispositif de protection destiné à une machine-outil, ainsi que système comprenant un dispositif de protection et une machine-outil
CN113613845A (zh) * 2019-04-29 2021-11-05 喜利得股份公司 用于动力工具的保护装置以及包括保护装置和动力工具的系统
EP4008466A1 (fr) * 2020-12-04 2022-06-08 Hilti Aktiengesellschaft Machine-outil doté d'un outil en forme de disque et d'une tôle de protection destinée à la protection contre le vol d'étincelles
WO2022117308A1 (fr) * 2020-12-04 2022-06-09 Hilti Aktiengesellschaft Outil motorisé avec outil en forme de disque et plaque protectrice pour protection contre les étincelles projetées

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