EP3520960A1 - Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug - Google Patents

Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug Download PDF

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Publication number
EP3520960A1
EP3520960A1 EP18155369.4A EP18155369A EP3520960A1 EP 3520960 A1 EP3520960 A1 EP 3520960A1 EP 18155369 A EP18155369 A EP 18155369A EP 3520960 A1 EP3520960 A1 EP 3520960A1
Authority
EP
European Patent Office
Prior art keywords
backing pad
connection arrangement
power tool
tool
pad member
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.)
Granted
Application number
EP18155369.4A
Other languages
English (en)
French (fr)
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EP3520960B1 (de
Inventor
Guido Valentini
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP18155369.4A priority Critical patent/EP3520960B1/de
Priority to EP18186573.4A priority patent/EP3520962B1/de
Priority to CN201910010803.8A priority patent/CN110116354B/zh
Priority to US16/251,388 priority patent/US20190240798A1/en
Publication of EP3520960A1 publication Critical patent/EP3520960A1/de
Application granted granted Critical
Publication of EP3520960B1 publication Critical patent/EP3520960B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B24B23/046—Clamping or tensioning means for abrasive sheets
    • 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
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • the present invention refers to a hand-held and hand-guided power tool comprising a housing with a driving motor located therein for actuating a driving shaft upon operation of the driving motor and further comprising a working element connected to the driving shaft in a torque proof manner and performing a working movement about the rotational axis of the backing pad member and/or in a working plane extending perpendicular to the rotational axis of the backing pad member as a result of operation of the driving motor and consequently actuation of the driving shaft.
  • the invention refers to a hand-held and hand-guided power tool comprising a housing with a driving motor located therein and adapted for driving a tool-connection arrangement protruding from the housing.
  • the power tool further comprises a plate-like backing pad member with two opposing surfaces, a first surface for releasable attachment of a polishing or abrasive element and an opposite surface with a backing pad-connection arrangement.
  • the tool-connection arrangement and the backing pad-connection arrangement constitute a connection arrangement and are adapted for interacting with one another for releasably connecting the backing pad member to the rest of the power tool in a torque proof manner.
  • connection arrangement comprises a recess member having a circumferential surface rotationally asymmetrical in respect to a rotational axis of the backing pad member and a protrusion member having a circumferential surface rotationally asymmetrical in respect to the rotational axis of the backing pad member.
  • the protrusion member and the recess member are adapted for entering into mutual engagement with one another in order to transmit a torque about the rotational axis of the backing pad member from the tool-connection arrangement to the backing pad-connection arrangement and further to the backing pad member.
  • the connection arrangement further comprises a securing member for securing the backing pad-connection arrangement to the tool-connection arrangement in an axial direction essentially parallel to the rotational axis of the backing pad member.
  • the invention refers to a plate-like backing pad member for use with a power tool of the above-mentioned kind.
  • the securing member is usually constituted by a securing screw which is inserted into an opening provided in the backing pad-connection arrangement in the centre of the backing pad member along its rotational axis and screwed into a threaded opening located in the tool-connection arrangement. This provides for a secure attachment of the backing pad member to the rest of the power tool, in particular to the tool-connection arrangement, in an axial direction parallel to the rotational axis of the backing pad.
  • the present invention suggests a power tool with the features of claim 1.
  • the working element is connected to the driving shaft in a torque proof manner by means of a form fit connection in a plane extending perpendicular to the rotational axis of the driving shaft.
  • the form fit connection is releasable in an axial direction parallel to the rotational axis, and that the working element is held within the form fit connection in respect to the driving shaft in the axial direction by means of magnetic force.
  • an important aspect of the present invention is attaching a working element of a power tool of any type to the rest of the power tool by magnetic force.
  • the magnetic force acts essentially in an axial direction parallel to the rotational axis of the driving shaft.
  • the torque to be transmitted acts in a plane perpendicular to the rotational axis of the driving shaft.
  • the torque is transmitted by means of a form fit connection between the driving shaft and the working element.
  • the form fit connection is releasable in the axial direction.
  • the magnetic force acting between the working element and the rest of the power tool, in particular the driving shaft prevents an unintentional release of the working element from the driving shaft. So instead of securing screws or similar mechanical securing means, the present invention uses the magnetic force for securing the working element to the rest of the power tool.
  • the driving shaft is connected to a tool-connection arrangement protruding from the housing in a torque proof manner.
  • the working element is a plate-like backing pad member with two opposing surfaces, a first surface for releasable attachment of a polishing or abrasive element and an opposite surface with a backing pad-connection arrangement, the tool-connection arrangement and the backing pad-connection arrangement constituting a connection arrangement and adapted for interacting with one another for releasably connecting the backing pad member to the rest of the power tool in a torque proof manner by means of the form fit connection.
  • the present invention is particularly advantageous in connection with polishing or sanding power tools having a working element in the form of a backing pad member with the polishing or abrasive element attached thereto.
  • a sander or a polisher is often used for working vehicle, boat or ship bodies.
  • the backing pad member of the power tool has preferably a circular external form and effects a purely rotational, a purely orbital, a random-orbital or a roto-orbital (gear driven) working movement.
  • connection arrangement comprises a recess member having a circumferential contour rotationally asymmetrical in respect to the rotational axis of the backing pad and a protrusion member having a circumferential contour rotationally asymmetrical in respect to the rotational axis of the backing pad member.
  • the protrusion member and the recess member are adapted for entering into mutual engagement in order to transmit a torque acting in the plane extending perpendicular to the rotational axis of the driving shaft, and the connection arrangement further comprising at least one permanent magnet attached to one of the backing pad member or the rest of the power tool and at least one ferromagnetic element or further permanent magnet attached to the respective other of the rest of the power tool or the backing pad member.
  • the at least one permanent magnet on the one hand and the at least one ferromagnetic element or further permanent magnet on the other hand are adapted for interacting with one another in order to hold the backing pad-connection arrangement in the form fit connection in respect to the tool-connection arrangement in the axial direction by means of magnetic force.
  • the torque is transmitted by the protrusion member entering into mutual engagement with the recess member and due to the rotationally asymmetrical external contour of the protrusion member and the corresponding rotationally asymmetrical internal contour of the recess member.
  • the backing pad member Even if during intended use of the power tool a force is applied to a side region of the first surface of the backing pad member carrying the polishing or abrasive element and spaced apart from the rotational axis of the backing pad member, the backing pad member will not be tilted and detached from the tool-connection arrangement due to the magnetic forces acting between the backing pad member and the rest of the power tool, in particular between the backing pad-connection arrangement and the tool-connection arrangement.
  • the risk of tilting and detachment of the backing pad from the tool-connection arrangement due to excessive force on the side region of the first surface of the backing pad member can be further reduced, if the lateral internal side walls of the recess member and the corresponding lateral external side walls of the protrusion member, respectively, lie against each other along their entire surfaces. This prevents that the backing pad member is tilted about a tilting axis running essentially perpendicular to the rotational axis of the backing pad member, when attached to the tool-connection arrangement; the backing pad member can only be disconnected from the tool-connection arrangement in an axial direction.
  • the backing pad member can be easily and quickly removed from the rest of the power tool by simply holding the backing pad member in the one hand and the rest of the power tool in the other hand and by applying a force in the axial direction along the rotational axis of the backing pad member pulling them apart thereby overcoming the magnetic force acting between them. No additional tools are required, no threaded connections have to be loosened and fastened and the operator of the power tool can keep on his working or safety gloves.
  • the attachment of the backing pad to the tool-connection arrangement proposed by the present invention is particularly advantageous in the rough and dirt laden environment of vehicle and boat detailing centres, vehicle body shops and shipyards, where the power tool according to the present invention is often used. Dust and other small debris particles cannot significantly impair the magnetic forces acting between the backing pad member and the rest of the power tool and, therefore, even with some dust and other small debris particles located between the backing pad member and the rest of the power tool, a safe and secure attachment of the backing pad member to the rest of the power tool in the axial direction can be achieved. This is usually not the case with the conventional mechanical securing means.
  • Fig. 1 an example of a hand-guided and hand-held motor driven power tool according to the present invention is designated with reference sign 1 in its entirety.
  • the power tool 1 is embodied as a random orbital polisher.
  • the polisher 1 has a housing 2, essentially made of plastic material.
  • the housing 2 has a handle 3 at its rear end and a grip 4 at its front end.
  • An electric power supply line 5 with an electric plug at its distal end exits the housing 2 at the rear end of the handle 3.
  • a switch 6 is provided for turning on and off the power tool 1.
  • the switch 6 can be continuously held in its activated position by means of a push button 7.
  • the power tool 1 can be provided with speed adjustment means 10 (e.g. a knurled wheel) for adjusting the rotational speed of the tool's motor.
  • the housing 2 can be provided with cooling openings 8 for allowing heat from electronic components and/or the electric motor both located inside the housing 2 to dissipate into the environment.
  • the power tool 1 has an electric motor 11 located inside the housing 2 for driving a tool-connection arrangement 12 protruding from the housing 2 and a plate-like backing pad member 9 attached thereto.
  • the power tool 1 according to the present invention could also be equipped with a pneumatic motor, which is especially advantageous in explosive environments, where sparks from an electric motor could provoke an explosion of an explosive mixture (e.g. oxygen and very fine dust) contained in the environment.
  • the power tool 1 would be connected to a compressed-air line instead of the electric cable 5.
  • the power tool 1 could alternatively be equipped with a rechargeable battery (not shown) located inside the housing 2. In that case the electric energy for driving the electric motor 11 would be provided by the battery.
  • the backing pad member 9 is rotatable about a rotational axis 13. In this embodiment it performs a random-orbital working movement. However, to those skilled in the art it is clear that the backing pad 9 could also perform any other type of working movement, e.g. a purely rotational, a purely orbital or a roto-orbital (gear driven) working movement.
  • the backing pad member 9 has two opposing surfaces, a first bottom surface 9a for releasable attachment of a polishing or abrasive member 14 (e.g. by means of hook-and-loop fastening surfaces) and an opposite top surface 9b with a backing pad-connection arrangement 15 attached thereto.
  • the backing pad-connection arrangement 15 may comprise a metal insert (e.g. see Fig. 12 ) which is moulded into the material of the backing pad member 9 and/or the backing pad arrangement 15 during its production by means of a moulding or an injection moulding process.
  • a metal insert e.g. see Fig. 12
  • the tool-connection arrangement 12 comprises a protrusion member 16 and the backing pad-connection arrangement 15 comprises a recess member 17.
  • the tool-connection arrangement 12 could also comprise a recess member and the backing pad-connection arrangement 15 could comprise a protrusion member.
  • the tool-connection arrangement 12 and the backing pad-connection arrangement 15 constitute a connection arrangement. They are adapted for interacting with one another for releasably connecting the backing pad member 9 to the rest of the power tool 1 in a torque proof manner.
  • the recess member 17 of the connection arrangement 15 has an inner circumferential wall 18 rotationally asymmetrical in respect to the rotational axis 13 of the backing pad 9.
  • the protrusion member 16 has an outer circumferential wall 19 rotationally asymmetrical in respect to the rotational axis 13 of the backing pad 9.
  • the protrusion member 16 and the recess member 17 are adapted for entering into mutual engagement with one another in order to transmit a torque from the tool-connection arrangement 12 to the backing pad-connection arrangement 15 about the rotational axis 13 of the backing pad member 9.
  • the connection arrangement further comprises a securing member for securing the backing pad-connection arrangement 15 to the tool-connection arrangement 12 in an axial direction, in particular parallel to the rotational axis 13 of the backing pad 9.
  • the electric motor 11 is powered by electricity arriving through the electric cable 5 from a mains power supply.
  • An electronic control unit (ECU) 20 is provided inside the housing 2 for controlling the speed of the electric motor 11 and possibly other functions of the power tool 1.
  • the speed adjustment means 10 generate a set-point signal 21 which is forwarded to the ECU 20 for controlling the rotational speed of the motor 11.
  • the ECU 20 generates a control signal 22 which is forwarded to the motor 11. Depending on the value of the control signal 22 the motor 11 rotates at a certain speed and actuates a motor shaft 23.
  • a gear arrangement 24 may be located between the motor shaft 23 and the tool-connection arrangement 12 in order to reduce the rotational speed and to enhance the torque output at the too-connection arrangement 12.
  • a bevel gear arrangement 25 may be provided in order to translate the rotation of an intermediate shaft 26 extending in an essentially horizontal direction into the rotation of a driving shaft 27 extending in an essentially vertical direction.
  • the bevel gear 25 is necessary for angular power tools only.
  • the bevel gear arrangement 25 could also realize a translation of a rotation by different angles other than 90°.
  • the tool-connection arrangement 12 is connected to the driving shaft 27 in a torque proof manner.
  • the driving shaft 27 could be constituted by the motor shaft 23 or the intermediate shaft 26, when no gear arrangement 24 and/or no bevel gear arrangement 25 is present.
  • Figs. 3 and 4 show two different types of the tool-connection arrangement 12 known from the prior art.
  • the driving shaft 27 is connected to the tool-connection arrangement 12 on the side (eccentrically) in a distance to a central axis 28 of gravity of the tool-connection arrangement 12, with the axis of gravity 28 and a rotational axis 29 of the driving shaft 27 running essentially parallel in respect to one another.
  • the protrusion member 16 is guided freely rotatable about the rotational axis 13 in respect to the rest of the tool-connection arrangement 12. To this end, there may be bearings 30 between the protrusion member 16 and the rest of the tool-connection arrangement 12.
  • the axis of gravity 28 of the tool-connection arrangement 12 and the rotational axis 13 of the backing pad member 9 are identical.
  • the driving shaft 27 is connected to the tool-connection arrangement 12 in the center of gravity of the tool-connection arrangement 12, with the axis of gravity 28 and the rotational axis 29 of the driving shaft 27 being identical.
  • the protrusion member 16 is guided freely rotatable about the rotational axis 13 in respect to the rest of the tool-connection arrangement 12.
  • the axis of gravity 28 of the tool-connection arrangement 12 is located in a distance (eccentrically) to the rotational axis 13 of the backing pad member 9.
  • a rotation of the driving shaft 27 about the axis 29 leads to a random-orbital working movement of the protrusion member 16 and, consequently, of the backing pad member 9 attached thereto.
  • the backing pad-connection arrangement 15 is connected to the tool-connection arrangement 12 in a torque proof manner.
  • the sheet-like polishing or abrasive member 14 is releasably attached to the bottom surface 9a of the backing pad 9.
  • a polishing member it may comprise but is not limited to a sponge, a microfiber, and real or synthetic lambs' wool.
  • an abrasive member it may comprise but is not limited to a sanding paper or a sanding fabric.
  • the sheet-like polishing or abrasive member 14 may be attached to the backing pad member 9 by means of a hook-and-loop fastener (or Velcro®).
  • a first layer of the hook-and-loop fastener may be provided on the bottom surface 9a of the backing pad 9, wherein the top surface of the sheet-like working material 14 is provided with a corresponding second layer of the hook-and-loop fastener.
  • the two layers of the hook-and-loop fastener interact with one another in order to releasably but safely fix the sheet-like polishing or abrasive member 14 to the bottom surface 9a of the backing pad 9.
  • the backing pad member 9 is preferably made of a semi-rigid material, in particular a plastic material, which on the one hand is rigid enough to carry and support the sheet-like polishing or abrasive member 14 during the intended use of the power tool 1 and to apply a force to the polishing or abrasive member 14 in a direction essentially parallel to the backing pad's rotational axis 13 and which on the other hand is flexible enough to avoid damage or scratching of the surface to be worked by the backing pad member 9 or the polishing or abrasive member 14, respectively, during the intended use of the power tool 1.
  • the backing pad member 9 may comprise different materials e.g. having different rigidities, which are fixed together, e.g. by means of a moulding process.
  • the different materials may comprise different plastic materials or plastic and metal.
  • for stabilizing the backing pad member 9 it could be possible to introduce a metal support structure into the backing pad member 9 during the moulding process for manufacturing it.
  • the securing member for securing the backing pad-connection arrangement 15 to the tool-connection arrangement 12 in an axial direction essentially parallel to the rotational axis 13 of the backing pad member 9 comprises a securing screw 31 having a threaded shaft 32 and a screw head 33.
  • the shaft 32 may be inserted from the bottom of the backing pad member 9 into a through hole 34 provided in the backing pad member 9 along its rotational axis 13.
  • a recessed portion 35 of the through hole 34 is adapted for receiving the screw head 33.
  • the threaded shaft 32 is screwed into a threaded hole 36 provided in the tool-connection arrangement 12, in particular in the protrusion member 16.
  • replacement of the backing pad member 9 is rather complicated and time consuming because first the screw 31 has to be loosened and unscrewed before an old backing pad member 9 can be detached from the tool-connection arrangement 12 and then the screw 31 has to be rescrewed and tightened again after a new backing pad member 9 has been attached to the tool-connection arrangement 12.
  • the present invention suggests an attachment of the backing pad member 9 to the tool-connection arrangement 12 by means of magnetic force.
  • the backing pad member 9 is connected to the driving shaft 27 in a torque proof manner by means of a form fit connection, for example comprising the protruding member 16 and the recess member 17.
  • the form fit connection acts in a plane extending essentially perpendicular to the rotational axis 13 of the backing pad member 9.
  • the form fit connection 16, 17 is releasable in an axial direction only, and the backing pad member 9 is held within the form fit connection 16, 17 in respect to the driving shaft 27 in the axial direction by means of magnetic force.
  • Additional force for holding the backing pad member 9 within the form fit connection 16, 17 in respect to the driving shaft 27 in the axial direction may be applied by means of an additional snapping or clinching mechanism (not shown).
  • Preferred embodiments of the invention are shown in Figs. 6 to 12 .
  • At least one permanent magnet 40 is provided within or attached to the backing pad member 9 (see Figs. 8-10 ), preferably near or inside the backing pad-connection arrangement 15.
  • one permanent magnet 40 is provided immediately below the recess member 17 of the backing pad-connection arrangement 15.
  • at least one ferromagnetic element 41 is provided within or attached to the rest of the power tool 1 (see Figs. 6 and 7 ) or the tool-connection arrangement 12, respectively.
  • the protrusion member 16 of the tool-connection arrangement 12 is made of iron (Fe) or steel and constitutes the ferromagnetic element 41.
  • the number of permanent magnets 40 in the backing pad member 9 may vary. Furthermore, the at least one permanent magnet 40 may be located at almost any desired position of the backing pad member 9 as long as it has at least one corresponding ferromagnetic element 41 at the rest of the power tool 1 with which the permanent magnet 40 may interact in order to provide for the desired axial attachment of the backing pad member 9 to the tool-connection arrangement 12.
  • the at least one permanent magnet 40 could be located at the top surface 9b of the backing pad member 9 eccentrically from its rotational axis 13, and ferromagnetic elements 41 could be provided at corresponding positions along the bottom surface of the power tool 1 or its housing 2, respectively.
  • the at least one permanent magnet 40 is provided at the rest of the power tool 1 or the tool-connection arrangement 12, respectively, whereas the at least one ferromagnetic element 41 is provided at the backing pad member 9 or the backing pad-connection arrangement 15, respectively.
  • the backing pad member 9 had an insert made of iron or steel (e.g. see Fig. 12 ) and defining the recess member 17, the insert itself could constitute the ferromagnetic element 41.
  • conventional backing pad members 9 could be used with the power tool 1 according to the present invention with at least one permanent magnet 40 located therein or at the tool-connection arrangement 12, respectively.
  • the present invention provides for a quick fastening and releasing mechanism for the backing pad member 9.
  • the use of magnetic force for securing the backing pad member 9 to the rest of the power tool 1 provides for a sufficiently safe and strong attachment of the backing pad member 9 to the rest of the power tool 1 or of the backing pad-connection arrangement 15 to the tool-connection arrangement 12, respectively.
  • the transmission of high torque values is possible, too, because the torque to be transmitted acts in a plane essentially perpendicular to the rotational axis 13 of the backing pad member 9 and torque transmission is effected by means of the form fit connection between the protrusion member 16 and the recess member 17 and the corresponding inner and outer walls 18, 19 interacting with one another.
  • torque is transmitted in a plane essentially perpendicular in respect to the rotational axis 13 by means of a mechanical form fit connection and the backing pad member 9 is held in an axial direction essentially parallel to the rotational axis 13 by magnetic force.
  • the invention has the further advantage that the backing pad member 9 as well as the tool-connection arrangement 12 can be embodied much less complicated.
  • detachment and attachment of the backing pad member 9 can be achieved by a user of the power tool 1 without him having to take off working or safety gloves and without the need for specific tools for operating securing means such as a securing screw 31.
  • the securing of the backing pad member 9 to the rest of the power tool 1 still works very safely and reliably even if abrasive dust and other small debris particles enter between the backing pad-connection arrangement 15 and the tool-connection arrangement 12.
  • the thread of a securing screw and/ or of a threaded hole could be covered and clogged by dust and small debris particles such that the screw can no longer be screwed into the threaded hole.
  • a protective cover sheet 42 which is located between the permanent magnet 40 and the respective part of the protruding member 16 when establishing the axial attachment of the backing pad-connection arrangement 15 to the tool-connection arrangement 12 (see Fig. 10 ).
  • the cover sheet 42 is made of a material having damping characteristics such as plastic or rubber.
  • the cover sheet 42 could also be made of some ferromagnetic material having the advantage that the magnetic forces from the permanent magnet 40 are better transmitted in the direction of the tool-connection arrangement 12 resulting in higher magnetic forces acting on the ferromagnetic element 41.
  • the cover sheet 42 could also comprise more than one layer preferably made of different materials, such as a first very thin layer made of plastic or rubber on top of the permanent magnet 40 and a second layer made of strong and resistant metal on top of the first layer.
  • Figs. 11 and 12 show the tool-connection arrangement 12 and the backing pad-connection arrangement 15 in further detail.
  • the protruding member 16 with its outer walls 19 located at the bottom of the power tool 1 is shown in Fig. 11 .
  • the recess member 17 with its inner walls 18 located at the top surface 9b of the backing pad member 9 is shown in Fig. 12 .
  • the protrusion member 16 as well as the recess member 17 have a circumferential contour, which is asymmetric in respect to the rotational axis 13 in order to provide for the torque transmission from the tool-connection arrangement 12 to the backing pad-connection arrangement 15.
  • the outer circumferential contours of the protrusion member 16 and the recess member 17 are identical in terms of allowing introduction and a precise fitting of the protrusion member 16 in the recess member 17.
  • the form fit connection between the protrusion member 16 and the recess member 17 is such that the outer and inner walls 19, 18 abut against each other with their entire surfaces when the protrusion member 16 is inserted into the recess member 17.
  • the form fit connection between the protrusion member 16 and the recess member 17 is releasable in the axial direction.
  • magnetic force is used.
  • the metal insert of the backing pad-connection arrangement 15 is made of permanent magnetic material thereby constituting the permanent magnet 40.
  • the backing pad-connection arrangement 15 visible on the top surface 9b of the backing pad member 9 may be covered with a protective sheet material such as plastic or rubber (not shown).
  • the protrusion member 16 of the tool-connection arrangement 12 is made of ferromagnetic material thereby constituting the ferromagnetic element 41.
  • the tool-connection arrangement 12 and the backing pad-connection arrangement 15 are tightly held together in their form fit connection in an axial direction by means of magnetic force, thereby firmly attaching the backing pad member 9 to the rest of the power tool 1.
  • the backing pad-connection arrangement 15 comprises a metal insert member forming the recess member 17 and having an inner circumferential wall 18, which in the plane extending perpendicular to the rotational axis 13 of the backing pad member 9 comprises two opposing arc shaped sections 18a of a circle with the rotational axis 13 running through the circle's centre.
  • the arc shaped sections 18a are interconnected by two opposing straight lines 18b running essentially parallel to one another.
  • the circle has a radius of appr. 19mm
  • the parallel straight walls 18b are spaced appr. 17,2mm apart.
  • the outer contour of the protrusion member 16 is shaped correspondingly (see Fig.
  • FIG. 11 comprising arc shaped sections 19a of a circle with the rotational axis 13 running through the circle's centre.
  • the arc shaped sections 19a are interconnected by two opposing straight lines 19b running essentially parallel to one another.
  • the outer and inner contours of the outer and inner walls 19, 18 of the protrusion member 16 and the recess member 17 shown in Figs. 11 and 12 are purely exemplary and may have almost any other form, too, which is asymmetric in respect to the rotational axis 13.
  • the inner circumferential wall 18 of the recess member 17 in the plane extending perpendicular to the rotational axis 13 of the backing pad member 9 comprises two opposing cavities located in the middle of the arc shaped sections 18a and extending radially outwards.
  • the outer circumferential wall 19 of the protrusion member 16 in the plane extending perpendicular to the rotational axis 13 of the backing pad member 9 comprises two opposing noses located in the middle of the arc shaped sections 19b and having a shape corresponding to the cavities of the recess member 17.
  • the present invention is not limited to that kind of power tool. Rather, the invention may be realized with any type of power tool having a working element of any type releasably attached thereto.
  • the invention could be realized with a drill, where the working element is in the form of a drill chuck performing a purely rotational working movement.
  • the power tool could be an oscillating sander, where the working element is in the form of a rectangular or triangular backing pad performing a purely oscillating working movement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP18155369.4A 2018-02-06 2018-02-06 Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug Active EP3520960B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18155369.4A EP3520960B1 (de) 2018-02-06 2018-02-06 Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug
EP18186573.4A EP3520962B1 (de) 2018-02-06 2018-07-31 Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug
CN201910010803.8A CN110116354B (zh) 2018-02-06 2019-01-07 手持和手导动力工具和用于其的背衬垫形式的作业元件
US16/251,388 US20190240798A1 (en) 2018-02-06 2019-01-18 Hand-held and hand-guided power tool having a working element releasably attached thereto, and working element in the form of a backing pad for such a power tool

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EP18155369.4A EP3520960B1 (de) 2018-02-06 2018-02-06 Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug

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EP18186573.4A Active EP3520962B1 (de) 2018-02-06 2018-07-31 Handhaltbares und handgeführtes elektrowerkzeug mit einem lösbar daran angebrachten arbeitselement und arbeitselement in form eines stütztellers für solch ein elektrowerkzeug

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CN114161282A (zh) * 2020-09-10 2022-03-11 吉多·瓦伦蒂尼 手持式电池操作的电动工具
CN115106898A (zh) * 2021-03-23 2022-09-27 安德里亚·瓦伦蒂尼 适用于与手持抛光或砂光动力工具可拆卸附接的板状垫板

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USD946370S1 (en) * 2018-10-29 2022-03-22 Lake Country Manufacturing, Inc. Abrading, buffing and finishing spherocylinder
EP3646987B1 (de) * 2018-10-29 2023-06-14 Guido Valentini Handgeführtes elektrowerkzeug zum exzenterpolieren oder -schleifen
EP3854526A1 (de) * 2020-01-23 2021-07-28 Guido Valentini Schutzkragen für eine handgeführte werkzeugmaschine und handgeführtes elektrowerkzeug mit einem solchen schutzkragen
EP3854523A1 (de) * 2020-01-23 2021-07-28 Guido Valentini Funktionale einheit für ein handgeführtes elektrowerkzeug und elektrowerkzeug mit solch einer funktionalen einheit
EP4368350A1 (de) * 2022-11-08 2024-05-15 Andrea Valentini Handgeführte elektrische polier- oder schleifmaschine
AT18203U1 (de) * 2023-09-08 2024-05-15 Invicon Chemical Solutions Gmbh Vibrationsschleifer

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JPH10249698A (ja) * 1997-03-17 1998-09-22 Takasaki Tetsudo Seibi Kk コーナー用ハンディポリッシャー
DE29923017U1 (de) * 1999-12-30 2000-02-24 J. König GmbH & Co Werkzeugfabrik, Steinindustrie- und Handwerkerbedarf, 76227 Karlsruhe Vorrichtung zum lösbaren Befestigen eines Schleifkörpers an einer Schleifmaschine
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CN114161282A (zh) * 2020-09-10 2022-03-11 吉多·瓦伦蒂尼 手持式电池操作的电动工具
EP3967457A1 (de) * 2020-09-10 2022-03-16 Guido Valentini Handgeführtes batteriebetriebenes elektrowerkzeug
CN115106898A (zh) * 2021-03-23 2022-09-27 安德里亚·瓦伦蒂尼 适用于与手持抛光或砂光动力工具可拆卸附接的板状垫板
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Also Published As

Publication number Publication date
EP3520962A1 (de) 2019-08-07
US20190240798A1 (en) 2019-08-08
CN110116354B (zh) 2022-03-18
EP3520962B1 (de) 2022-05-18
EP3520960B1 (de) 2022-05-18
CN110116354A (zh) 2019-08-13

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