EP3135432B1 - Schleifteller für ein handgeführtes elektrowerkzeug, sowie elektrowerkzeugsystem - Google Patents

Schleifteller für ein handgeführtes elektrowerkzeug, sowie elektrowerkzeugsystem Download PDF

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Publication number
EP3135432B1
EP3135432B1 EP16180319.2A EP16180319A EP3135432B1 EP 3135432 B1 EP3135432 B1 EP 3135432B1 EP 16180319 A EP16180319 A EP 16180319A EP 3135432 B1 EP3135432 B1 EP 3135432B1
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EP
European Patent Office
Prior art keywords
support element
carrier element
sanding
sanding plate
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16180319.2A
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German (de)
English (en)
French (fr)
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EP3135432A1 (de
Inventor
Martin Richter
Mike Sprock
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3135432A1 publication Critical patent/EP3135432A1/de
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Publication of EP3135432B1 publication Critical patent/EP3135432B1/de
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    • 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
    • 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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass

Definitions

  • the invention relates to a sanding pad for a hand-held power tool, in particular for a grinding device with oscillating drive shaft, and a power tool system with at least one power tool and such a sanding pad.
  • the sanding pad device comprises a sanding pad, on the underside of which a sanding sheet can be fastened by means of a hook-and-loop fastener.
  • the sanding pad which consists of a slightly flexible plastic, is positively coupled via a driver to a tool shaft of the power tool, wherein the driver is disc-shaped and has a central recess for positive connection with a rotating with the tool shaft component.
  • the driver element is glued to a connecting disc, which in turn is connected to the sanding plate by gluing.
  • the driver element is designed as a steel component.
  • a sanding plate device which comprises a sanding pad of a flexible, foamed plastic and a driving element of a relatively hard plastic, which is connected to the sanding plate, for example, shed.
  • a sanding pad with a receptacle for connection to a drive shaft of an oscillating drive in which the receptacle is designed for positive connection with the drive shaft of the oscillatory drive, wherein the receptacle is connected to a carrier element and the support element is a cushion element made of resilient material is added to wherein a sanding surface is formed, wherein the sanding pad has an edge region, a receiving region which encloses the receptacle, and an intermediate region between the edge region and the receiving region, and wherein the edge region is materially reinforced in relation to the intermediate region.
  • the user thus automatically increases the print pressure. Due to the higher pressure in conjunction with an oscillating drive movement, the friction and thus the heating of the abrasive and the grinding plate is increased. This has the consequence, for example, that the velor layer of the abrasive, which serves to attach the abrasive to the sanding pad sticks to the sanding pad, especially if it is made on a relatively soft foam. This area of the grinding arrangement is then no longer or only very limited usable.
  • the invention is based on the object with simple measures to provide a multifunctional sanding pad, in particular both a large area Abschleifen of workpieces allows, as well as has a good Ecken operakeit.
  • the sanding pad according to the invention can be used in hand-held power tools, such as in particular grinding devices which are provided with a rotary oscillation drive, via which a tool shaft of the grinding device is set in a rotational oscillating motion.
  • hand-held power tools such as in particular grinding devices which are provided with a rotary oscillation drive, via which a tool shaft of the grinding device is set in a rotational oscillating motion.
  • a hand-held grinding device is, for example, a vibrating or delta sander or an eccentric sander or an oscillating multitool.
  • the sanding pad has a receiving element for fastening the sanding pad to a drive shaft of the power tool, wherein the receiving element is designed for the rotationally fixed connection of the sanding disc to the drive shaft. Furthermore, the sanding pad has a support element of at least one resilient material for fastening an abrasive to the sanding pad.
  • the carrier element is at least partially supported on and by a supporting element connected to the receiving element, the ratio (R) of the radii of a circumference to be circumscribed to the carrier element to at least one circumference to be circumscribed to the supporting element in the range from 1.3 to 2, in particular in a range of 1.4 to 1.5.
  • the sanding pad in particular the support element, may have means for attaching an abrasive, such as a sandpaper, to the support member of the sanding pad.
  • an abrasive such as a sandpaper
  • the carrier element of the sanding pad is arranged on the side facing away from the receiving element of the support element.
  • the support element is formed of a solid material as possible, but also has a certain flexibility.
  • the support element may for example be made of a thermoplastic material, in particular a hard plastic.
  • a polyamide with additional glass fiber reinforcement is suitable.
  • the receiving element which serves as a mechanical interface for fastening the sanding disk to a machine tool, is formed integrally with the supporting element.
  • the receiving element may be made of a metallic or non-metallic material for reasons of stability.
  • the support member can be molded directly to the receiving element.
  • the receiving element can absorb relatively high forces or moments due to the design as a metal component.
  • the sanding pad is designed in such a way that the receiving element is positively and / or non-positively received in or on the sanding pad. In the direction in which the positive engagement exists, thus high forces or moments between the receiving element and the sanding pad can be transferred without this additional fastening measures are absolutely necessary.
  • the positive connection may consist in one or more directions, for example in the radial direction between the receiving element and the sanding pad, based on the tool shaft axis.
  • a positive connection between the receiving element and sanding plate exist, for example, the shape that both the sanding pad and the receiving element form-fitting elements are arranged, which interlock form-locking, for example in the form of radially projecting tabs, which are insertable into corresponding recesses;
  • the receiving element may have a substantially round cross-sectional shape. But it is also possible a non-circular cross-sectional shape of the receiving element, which has, for example, an oval shape and can be inserted into a corresponding recess.
  • the receiving element can be formed in an advantageous manner as a three-dimensional interface in the sense of a driver element, as described in detail in the publications WO 2015/014467 A1 . WO 2015/014468 A1 . WO 2015/014469 A1 is set forth, the content of which is thus also disclosed as disclosed in this application.
  • the receiving element can also be designed as a planar interface, as known from the prior art, for example with a four-fold or even twelve-fold symmetry.
  • the receiving element which serves as a driver element, via which the sanding pad is connected to the tool shaft of a power tool, such as a grinder, results in that the rotational oscillating movement of the tool shaft can be transferred to the sanding pad.
  • the sanding pad has on its underside an abrasive, such as an abrasive sheet, which is to be connected via suitable attachment measures such as a hook and loop fastener with the sanding sheet releasably.
  • the sanding pad itself is typically made of plastic, advantageously using plastics of different properties. This has the advantage that the sanding pad can perform a relatively large deflection without permanent deformation at high contact pressure.
  • the support element serves at the same time the attachment of the support element.
  • the carrier element is designed for attachment of an abrasive such as a sandpaper and consists essentially of a softer material, such as a foam,
  • On the support element itself may be molded onto the support element, or is the reverse case possible.
  • the carrier element has hooks in the sense of a Velcro (Velcro), which can make a firm but detachable connection with the abrasive, in particular with a attached on the back of the abrasive velor layer.
  • Velcro Velcro
  • the support member is made of a resilient material, such as a polyurethane.
  • a flexible material is to be understood here in particular as meaning a material having a hardness of 25 to 55 Shore 0.
  • the support element of the grinding wheel according to the invention has a hardness in the range of 40 to 50, in particular a hardness in the range of 43 to 47 Shore 0, in particular a hardness of about 45, Shore 0 on.
  • a sanding pad with a soft support element for an abrasive wherein the support element has a hardness in the range of 40 to 50 Shore 0, in particular, a hardness of about 45 Shore 0, and a harder support region for this support element, wherein the ratio (R) the radii of a circumference to be circumscribed to the support element to a circumference to be circumscribed in the support element in the range of 1.3 to 2, in particular in a range of 1.4 to 1.5, provides a combination with very good results in terms of large-scale grinding of workpieces on the one hand, as well as with respect to a good Eckenbeckkeit.
  • the carrier element has in one embodiment a substantially triangular-shaped base.
  • the triangular base surface may in particular have convex sides. In this way it is possible to form corner-shaped tips.
  • the support member could also be round, rectangular square or formed as a polygon.
  • the support element of the sanding disk can also have a substantially triangular basic shape, wherein the "triangle tips" of the supporting element should be rounded off in an advantageous manner.
  • the triangle sides of the support element run substantially parallel to the triangle sides of the support element.
  • the support element of the sanding pad in one embodiment, in the radial direction toward the triangular tips of the support element, has a relative extension to the support element in the range of 60% to 80%, in particular in the range of 65% to 75% of the radial extent of the triangle tips lies.
  • the region of the tips of the sanding plate is designed to be flexible over a lack of support by a possible support element. This area can give way during grinding, especially in a cornering loops which reduces heat generation. This is done without giving up the possibility of efficient removal in the core area of the sanding pad.
  • the support element combined with the hardness of the support element, ensures the desired strength of the sanding pad.
  • an unsupported region of the carrier element and thus of the sanding disk has proven to be advantageous from 20% to 40%, and in particular from 25% to 35%, calculated from the corners of the carrier element towards the axis of symmetry of the sanding disk or the support element.
  • This relatively large unsupported area is well realized by a support element having a hardness of 40 to 50, in particular a hardness in the range of 43 to 47 Shore 0, in particular a hardness of about 45 Shore 0.
  • the solid, inflexible portion of the abrasive surface defined by the support member is as large and stiff as possible so that an efficient removal in the core area of the sanding pad is possible
  • the support element has an arcuate boundary line in the direction perpendicular to the radial direction on the triangular tips of the carrier element. In this way, there is a rounded transition region between the supported part of the support element of the sanding pad and the unsupported part.
  • the loading direction which acts primarily on the carrier element is determined by the user or, the orientation of the tool device and / or the contour of the object to be ground.
  • a claimed arc line in the transition to the non-supported area can better absorb the loads from different directions and also prevents a cutting of the relatively soft carrier element. Such a cutting would inevitably lead to a fracture of the carrier element and the defect of the grinding plate.
  • the support element could also be round or have a polygonal shape.
  • the invention enables a tool system, in particular a power tool system, with a power tool, such as a grinder, in particular a hand-held grinder, with oscillating drive shaft, and a sanding pad for use with such a sanding pad that for a wide range of applications, in particular both a large-scale grinding of workpieces as well as a good Eckenjokeit allows is suitable.
  • a tool system according to the invention especially if it comprises the appropriate abrasives, such as abrasive papers, both for use in the professional field of crafts, which are typically facing the task of large-scale grinding of workpieces, as well as for DIY use, where a shorter duration of use and the editing of edges and corners are the focus, suitable.
  • the sanding pad 10 has a receiving element 12 designed as a driving element, which is used for fastening the sanding pad 10 to a - in Fig. 1 or, 2 drive shaft, not shown, of a power tool is used, wherein the receiving element 12 is formed for the rotationally fixed connection of the grinding disc 10 with the drive shaft.
  • the sanding pad of this embodiment has a 3-dimenionale mechanical interface, as described in the applications WO 2015/014467 A1 . WO 2015/014468 A1 . WO 2015/014469 A1 Set out in detail.
  • the receiving element 12 which in the embodiment of the Figures 1 and 2 is made of a metal, is firmly connected to a support element 22 made of an elastic but strong plastic.
  • the support element 22 consists of a thermoplastic hard plastic such as a polyamide, which is additionally reinforced by glass fibers.
  • the support element 22 is overmolded into the receiving element 12 in order to produce a firm connection between the two functional elements.
  • the receiving element 12 which serves as a mechanical interface for attachment of the sanding pad 10 on a machine tool, could also be made of a plastic and in particular be formed integrally with the support element 22.
  • the support member 14 may be adhered to the support member 22 or be molded around this.
  • the carrier element 14 of the sanding pad 10 is arranged on the side facing away from the receiving element 12 of the support element 22.
  • the support element 22 is formed of a solid material as possible, but also has a certain flexibility.
  • the carrier element 14 is larger than the support element.
  • the carrier element 14 in the embodiment of Figures 1 and 2 has a substantially triangular basic shape, wherein the sides 32, 34, 36 of the triangle are convex, so that they are outwardly, ie away from the axis of symmetry 60 (see FIG. 2 ) of the sanding plate "bulge out".
  • the support element 22 of the sanding pad 10 also has a substantially triangular basic shape, wherein the "triangle tips" of the Abtransforming mammals 22 are strongly rounded and arc sections 52, 54, 56 are formed. (See for example FIG. 2 The triangle sides 62, 64, 66 of the support element 22 run essentially parallel to the triangle sides 32, 34, 36 of the carrier element 14.
  • a hook and loop fastener also called Velcro
  • an abrasive such as a sandpaper
  • FIG. 3 shows the geometric dimensioning of a grinding disc 10 according to the invention. If one places around the tips 42, 44, 46 of the triangle of the carrier element 14 of the grinding plate according to the invention a perimeter 24 and to a concentric circle 26 about the support element 22 of the grinding plate 10, then have the radii or Also, the diameter of the support member circumference 26 to the support member circumference 24 in the embodiment of FIG. 3 a ratio of about 1.5. The centers of the circles lie on the axis of symmetry 60 of the grinding plate. This means that only two thirds of the radial extent are supported on the triangular tips of the flexible support member 14 in the present embodiment example of a grinding plate according to the invention.
  • a support element 22 ' is possible in which two arches 52', 54 'of a support element on a circumference 26, and a third arc 56' is located on a circumference with respect to the circumference 26 changed radius 26 '.
  • the centers of the circles are in turn on the symmetry axis 60 of the sanding plate. This would correspond to an isosceles triangle as a support element.
  • the three arches 52 ", 54", and 56 "of the support element are all at different radii, with the centers of the circles lying on the symmetry axis 60 of the sanding plate Adjust support element to special requirements.
  • the region of the carrier element 14, which therefore extends beyond the support region 22 and thus has a significantly higher flexibility, is thus dimensioned quite large according to the invention.
  • a chamfer 58 or slope In the range greater than 95% of the radial direction 38 on the triangular tips 42,44,46 of the support member 14 towards the support element according to the invention has a chamfer 58 or slope, which allows better accessibility, for example, interference contours on the workpiece.
  • this incline 58 is substantially parallel to the side edges 32, 34, 36 and runs around the entire support member.
  • the dimension of carrier element 14 and support member 22 is just chosen so that the perimeter 26 of the support element 22, the outermost boundary of the triangle sides 32, 34, 36 of the support member 14 straight cuts.
  • Such a sized pad has been found to be particularly advantageous, since on the one hand, a fairly large unsupported, i. Also free-carrying area of the support member 14 and thus of the sanding pad of 25% to 35%, calculated from the corners 42, 44, 46 of the support member 22 toward the axis of symmetry 60 of the sanding pad 10 and the support element 22 allows, but at the same time necessary stability and strength of the edges (corresponding to the triangle sides) of the sanding plate realized.
  • the support element 22 comes with its side edges 62, 64, 66 up to the bevel area 58 of the side edges 32, 34, 36 of the support material 16 zoom. It remains only an unsupported outer region of about 5 - 10% of the expansion of the support element in this direction. (See also the comments in connection with the FIG.
  • the support member 14 and attached to the support member 14 abrasive 28 can be strongly supported by the side edge 62, 64, 66 of the support portion 22 in such an operation in an advantageous manner and thus also be performed.
  • the triangular sides of the support element are therefore much less flexible than the areas of the triangle tips.
  • the "tips" of the supporting element 22 which is also substantially triangular, are strongly rounded and executed as a curved line 52, 54, 56
  • the support element 22 thus has in the direction 40 perpendicular to the radial direction 38 on the triangular tips 42, 44, 46 of the support element 22 toward arcuate boundary lines 52, 54, 56, which can be described essentially by a radius (see, for example FIG. 6 ).
  • the support member 22 to be circumscribed radius 26 has in the embodiment of FIG. 6 a radius of about 35 mm
  • the loading direction which acts primarily on the carrier element 22 is determined by the user or his orientation of the tool device and / or the contour of the object to be ground.
  • a claim according arc line 52, 54, 56 of the support element 22 in the transition To the unsupported area of the sanding pad, the loads from different directions (indicated by the circles 76 in FIG. 6 ) and also prevents a cutting of the relatively soft carrier material 16. Such a cutting would inevitably lead to a fracture of the carrier element 14 and the defect of the grinding plate 10.
  • FIG. 7 Once again an embodiment of a grinding plate 10 according to the invention is shown with the most important dimensions for this embodiment.
  • these dimensions may vary without departing from the inventive concept of a relatively large unsupported backing element of defined material hardness.
  • an advantageous tool system which consists of at least one power tool, such as a grinding device, and a sanding pad according to the invention.
  • FIG. 8 shows a section through a sanding pad 10 according to the invention around the symmetry axis 60 of the sanding pad around the receiving element 12 is raised formed, wherein the receiving element 12 is formed for rotationally fixed connection of the sanding pad 10 with a drive shaft of a power tool.
  • the receiving element 12, which in the embodiment of the FIG. 8 is made of a metal
  • the support element 22 in turn is firmly connected to the soft and flexible support member 14, which has bevels 58 to its edges.
  • the carrier element 14 of the sanding pad 10 is arranged on the side facing away from the receiving element 12 of the support element 22. On its underside, ie, the side facing away from the receiving element 12, the carrier element has a Velcro or Velcro 78 (Velcro) for attachment of an abrasive to the sanding pad 10.
  • FIG. 9 shows such a tool system 210 using a hand-held grinder 110 with oscillating drive shaft 100 and the sanding pad 10 according to the invention FIG. 1 ,
  • the sanding pad 10 is rotationally fixed by means of the receiving element 12 attached to the drive shaft 100 of the power tool, so that the axis of symmetry 60 of the sanding pad with the axis 102 of the drive shaft 100 is aligned.
  • the support element 22 comes to lie in the plane 104.
  • the power tool 110 can advantageously be battery or battery operated and thus be independent of the mains. This allows in particular the better accessibility of workpieces.
  • a net-independent grinding device allows, in particular against the background of the problem underlying the invention, a very flexible use of erfindungsgenmä on tool system.
  • the battery on a lithium chemistry such as lithium ions, lithium iron, lithium phosphorus or lithium-sulfur exist.
  • Such Ackumulatoren allow today already a very high power density, so that the devices can again be built quite small.
  • the tool system according to the invention can, of course, also be network-operated in order to ensure a constant readiness for operation.
  • Such a tool system according to the invention is suitable for a wide range of applications, in particular by adaptation / design of the sanding pad according to the invention to the specific work task. It is possible in an advantageous manner in particular both a large-scale grinding of workpieces and a good Eckeneckkeit.
  • the tool system according to the invention in particular also when the appropriate abrasives, such as abrasive papers are selected, both for use in the professional field of craftsmen, which are typically facing the task of large-scale grinding of workpieces, as well as for DIY use , in which a shorter duration of use and the editing of edges and corners are the focus, suitable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP16180319.2A 2015-08-31 2016-07-20 Schleifteller für ein handgeführtes elektrowerkzeug, sowie elektrowerkzeugsystem Active EP3135432B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015216615.5A DE102015216615A1 (de) 2015-08-31 2015-08-31 Schleifteller für ein handgeführtes Elektrowerkzeug, sowie Elektrowerkzeugsystem

Publications (2)

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EP3135432A1 EP3135432A1 (de) 2017-03-01
EP3135432B1 true EP3135432B1 (de) 2019-12-11

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US (1) US20170057046A1 (zh)
EP (1) EP3135432B1 (zh)
CN (1) CN106475875B (zh)
DE (1) DE102015216615A1 (zh)

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DE102011005809A1 (de) * 2011-03-18 2012-09-20 Robert Bosch Gmbh Werkzeugmaschinenbremsvorrichtung
DE102012210759A1 (de) * 2012-06-25 2014-01-02 Robert Bosch Gmbh Schutzhaubenvorrichtung

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DE102015216615A1 (de) 2017-03-02
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CN106475875A (zh) 2017-03-08
US20170057046A1 (en) 2017-03-02

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