US20170057046A1

US20170057046A1 - Sanding Plate of a Hand-Guided Electric Power Tool, and Electric Power Tool System

Info

Publication number: US20170057046A1
Application number: US15/252,879
Authority: US
Inventors: Martin Richter; Mike Sprock
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2015-08-31
Filing date: 2016-08-31
Publication date: 2017-03-02
Also published as: EP3135432B1; CN106475875A; EP3135432A1; DE102015216615A1; CN106475875B

Abstract

A sanding plate for a hand-guided electric power tool includes a receiving element and a carrier element. The receiving element is configured to fasten the sanding plate to a drive shaft of the electric power tool. In particular, the receiving element is configured to connect the sanding plate to the drive shaft in a rotationally fixed manner. The carrier element is formed of at least one yielding material. The carrier element is at least partially supported by a support element that is connected to the receiving element. The ratio of the radii of a circumcircle to circumscribe the carrier element to at least one circumcircle to circumscribe the support element is in the range of from 1.3 to 2. An electric power tool system includes a sander that has an oscillating drive shaft and the sanding plate.

Description

This application claims priority under 35 U.S.C. §119 to patent application no. DE 10 2015 216 615.5, filed on Aug. 31, 2015 in Germany, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

The disclosure relates to a sanding plate for a hand-guided electric power tool, in particular for a sander having an oscillating drive shaft, and to an electric power tool system having at least one electric power tool and such a sanding plate.
A sanding plate device for a hand-guided power tool having an oscillatory drive is described in DE 10 2009 013 370 A1. The sanding plate device comprises a sanding plate, to the underside of which a sanding sheet can be fastened by means of a hook-and-loop fastening. The sanding plate, which is composed of a slightly yielding plastic, is coupled in a form-fitting manner to a tool shaft of the hand-held power tool by means of a driver element, the driver element being realized in the form of a disk and having a central opening for connecting in a form-fitting manner to a component that rotates with the tool shaft. The driver element is adhesive-bonded to a connecting disk that, for its part, is connected to the sanding plate by adhesive bonding. The driver element is realized as a steel component.
Known from DE 10 2005 014 045 A1 is a sanding plate device that has a sanding plate of a soft-elastic foamed plastic, and has a driver element, of a comparatively hard plastic, which is connected, for example molded, to the sanding plate.
Known from DE 10 2013 106 546 A1 is a sanding plate having a receiver for connecting to a drive shaft of an oscillatory drive, in which the receiver is realized for connecting in a form-fitting manner to the drive shaft of the oscillatory drive, the receiver being connected to a carrier element, and the carrier element accommodating a cushion element of yielding material on which a sanding surface is realized, the sanding plate having an edge region, a receiving region that surrounds the receiver, and an intermediate region between the edge region and the receiving region, and the edge region being reinforced in respect of material relative to the intermediate region.
For prolonged sanding, in particular also of large surfaces, there is a need for good contact of the abrasive means, both in the core region of the sanding plate and in the tips. To enable a surface to be sanded as efficiently as possible, as large a region as possible—preferably in the central core region of the sanding plate—must be constantly and firmly in contact with the material to be removed. An obvious solution here is to reinforce the sanding plate, in particular also in its exposed tips. This, however, may in turn result in burning of the abrasive means in the corners, since during sanding of corners the pressure on the sanding plate, and consequently on the sanding paper, is increased significantly. In corners, and in similar applications where access is difficult, sanding is effected using the corners of the sanding plate. The user thereby automatically increases the contact pressure. The increased contact pressure in combination with an oscillating drive motion increases the friction, and consequently the heating of the abrasive means and of the sanding plate. This has the result, for example, that the velours layer of the abrasive means that serves to fasten the abrasive means to the sanding plate sticks to the sanding plate, particularly if the latter is composed of a relatively soft foam material. This region of the sanding assembly is then no longer usable, or is usable only to a very limited extent.

SUMMARY

The disclosure is based on the object of providing, by simple measures, a multifunctional sanding plate that, in particular, provides for both large-area sanding of workpieces and good corner accessibility.
This object is achieved by the features of the disclosure.
There is therefore a requirement, advantageously, for good contact of the abrasive means in the core region of the sanding plate and, on the other hand, resilience of the sanding plate in the tips.
The sanding plate according to the disclosure may be used in hand-guided electric power tools such as, in particular, sanders provided with a rotary oscillating drive that puts a tool shaft of the sander into a rotary orbital motion. Such a hand-guided sander is, for example, an orbital or delta sander, or an eccentric sander or an oscillating multitool.
The sanding plate has with a receiving element for fastening the sanding plate to a drive shaft of the electric power tool, the receiving element being realized to connect the sanding plate to the drive shaft in a rotationally fixed manner. Further, the sanding plate has a carrier element, of at least one yielding material, for fastening an abrasive means to the sanding plate. The carrier element is at least partially supported on and by a support element that is connected to the receiving element, the ratio (R) of the radii of a circumcircle to circumscribe the carrier element to at least one circumcircle to circumscribe the support element being in the range of from 1.3 to 2, in particular in a range of from 1.4 to 1.5.
The sanding plate, in particular the carrier element, may have with means for fastening an abrasive means such as, for example, a sanding paper, to the carrier element of the sanding plate.
The dependent claims specify expedient developments of the claimed sanding plate.
The carrier element of the sanding plate is disposed on the side of the support element that faces away from the receiving element. The support element is composed of a material that is a firm as possible, but that also has a certain flexibility. The support element may be composed of, for example, a thermoplastic material, in particular a hard plastic. A polyamide having additional glass-fiber reinforcement, for example, is suitable for this purpose.
In one embodiment of the sanding plate, the receiving element, which serves as a mechanical interface for fastening the sanding plate to a power tool, is integral with the support element.
In an alternative embodiment, for stability reasons the receiving element may be made of a metallic or non-metallic material. In this case, the support element may be molded directly around the receiving element. As a result of being realized as a metal component, the receiving element is able to absorb relatively large forces, or moments.
The sanding plate is realized such that the receiving element is accommodated in a form-fitting and/or force-fitting manner in or on the sanding plate. Large forces, or moments, can therefore be transmitted between the receiving element and the sanding plate in the direction realized by the form-fit, without additional fastening measures necessarily being required for this. The form-fit may be realized in one or several directions, for example in the radial direction between the receiving element and the sanding plate, relative to the tool shaft axis. Additionally or alternatively, a form-fit may also be realized in the circumferential between the receiving element and the sanding plate, for example the shape whereby disposed on both the sanding plate and the receiving element there are form-fitting elements that engage in one another in a form-fitting manner, for example in the form of radially projecting lugs that can be inserted in corresponding recesses; in the case of this embodiment, the receiving element may have a substantially round cross-sectional shape. Also possible, however, is a non-round cross-sectional shape of the receiving element, the latter being of an oval shape and being insertable in a corresponding recess.
The receiving element may be realized, advantageously, as a three-dimensional interface, as a driver element, as disclosed in detail in the publications WO 2015/014467 A1, WO 2015/014468 A1, WO 2015/014469 A1, the content of which is therefore likewise deemed to be disclosed in this application.
In other embodiments, the receiving element may also be realized as a flat interface, as known from the prior art, for example having a four-figure or, also, twelve-figure symmetry.
The receiving element, serving as a driver element by means of which the sanding plate is connected to the tool shaft of an electric power tool such as, for example, a sander, has the effect that the rotary oscillating motion of the tool shaft can be transmitted to the sanding plate. On its underside, the sanding plate has an abrasive means such as, for example, a sanding sheet, which can be separably connected to the sanding sheet by means of appropriate fastening measures such as, for example, a hook-and-loop fastening.
The sanding plate itself is typically composed of plastic; advantageously, plastics of differing properties are used. This has the advantage that, in the case of high contact pressure, the sanding plate can undergo a relatively large deflection without permanent deformation.
The support element serves simultaneously to fasten the carrier element. The carrier element is realized to fasten an abrasive means such as, for example, a sanding paper, and is composed substantially of a softer material, for example a foam material.
On the carrier element itself may be molded onto the support element, or the converse is also possible.
The carrier element has hooks in the manner of a hook-and-loop (Velcro) fastening, which can effect a firm but separable connection to the abrasive means, in particular to a velours layer attached to the back side of the abrasive means.
The carrier element is made of a yielding material such as, for example, a polyurethane. A yielding material is to be understood here to mean, in particular, a material having a hardness of 25 to 55 Shore 0.
The carrier element of the sanding plate according to the disclosure has a hardness in the range of from 40 to 50, in particular a hardness in the range of from 43 to 47 Shore 0, in particular a hardness of approximately 45 Shore 0.
The harder, and therefore stiffer, the carrier element is, i.e. in particular the foam material of the carrier element, the greater is the amount of heat produced, since the foam material can effect only a slight compensation of the contact pressure. This applies, in particular, to corners of the carrier element.
The same behavior also ensues if the foam material region of the carrier element is of insufficient hardness, since in this case there is increased friction, and consequently increased heating, because of the greater adhesiveness with respect to the abrasive material.
In both cases, the result is that the abrasive means sticks to the abrasive carrier element—with the corresponding negative effects.
A sanding plate with a soft carrier element for an abrasive means, the carrier element having a hardness in the range of from 40 to 50 Shore 0, in particular a hardness of approximately 45 Shore 0, and with a harder support region for this carrier element, the ratio (R) of the radii of a circumcircle to circumscribe the carrier element to a circumcircle to circumscribe the support element being in the range of from 1.3 to 2, in particular in a range of from 1.4 to 1.5, constitutes a combination that gives very good work results in respect of large-area sanding of workpieces, on the one hand, as well as in respect of good corner accessibility.
In one embodiment, the carrier element has a substantially triangular base. The triangular base may have, in particular, convex sides. It is thereby possible to realize tips that can access corners.
However, the carrier element could also be round, rectangular, square or realized as a polygon.
The support element of the sanding plate may likewise have a substantially triangular basic shape; advantageously, the “triangle tips” of the support element should be rounded. The triangle sides of the support element are substantially parallel to the triangle sides of the carrier element.
In one embodiment, the support element of the sanding plate, in the radial direction toward the triangle tips of the carrier element, has a relative extent, in respect of the carrier element, that is in the range of from 60% to 80%, in particular in the range of from 65% to 75%, of the radial extent of the triangle tips.
The region of the tips of the sanding plate is of a flexible design, owing to an absence of support by any support element. During sanding, in particular during sanding into corners, this region is able to yield, thereby reducing the amount of heat produced. This is achieved, however, without surrendering the possibility of efficient removal of material in the core region of the sanding plate. In this core region the required solidity of the sanding plate is provided by the support element, in combination with the hardness of the carrier element.
An unsupported region of the carrier element, and thus of the sanding plate, of from 20% to 40%, and in particular from 25% to 35%, calculated from the corners of the carrier element toward the axis of symmetry of the sanding plate, or of the support element, has proved advantageous in this case.
This relatively large unsupported region can be realized by a carrier element having a hardness of 40 to 50, in particular a hardness in the range of from 43 to 47 Shore 0, in particular a hardness of approximately 45 Shore 0.
Use of one or more of the stated features makes it possible for the solid, inflexible region of the abrasive surface that is defined by the support element to be designed so as to be as large and stiff as possible, thereby rendering possible efficient removal of material in the core region of the sanding plate.
In one embodiment, the support element, in the direction perpendicular to the radial direction toward the triangle tips of the carrier element, has an arcuate delimiting line. A rounded transition region is thus obtained between the supported part of the carrier element of the sanding plate and the unsupported part. The direction of load, acting primarily on the carrier element, is determined by the user, or the user's orientation of the power tool, and/or the contour of the object to be sanded. An arc line, as claimed, in the transition to the unsupported region is better able to absorb the loads from differing directions, and additionally prevents cutting into the relatively soft carrier element. Such cutting-in would necessarily result in breakage of the carrier element and render the sanding plate defective.
In alternative embodiments of the sanding plate, the support element could also be of a round design, or also be of a polygonal shape.
The disclosure renders possible a tool system, in particular an electric power tool system, having an electric power tool such as, for example, a sander, in particular a hand-held sander, having an oscillating drive shaft, and having a sanding plate for use with such a sanding plate, that is suitable for a wide range of application, and providing both for large-area sanding of workpieces and good corner accessibility. The tool system according to the disclosure is thus suitable, and particularly when the appropriate abrasive means such as, for example, sanding papers, are selected, both for use in the field of professional trades, in which there is typically a requirement for large-area sanding of workpieces, and for DIY use, in which the focus is on a shorter operating time and the machining of edges and corners.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and expedient embodiments of the disclosure are given by the claims, the description of the figures, and the drawings. The drawings show exemplary embodiments of the disclosure, in particular of the sanding plate according to the disclosure, which is explained in greater detail in the description that follows. Persons skilled in the art will recognize that the features of individual exemplary embodiments can be combined with one another in any manner.

There are shown:

FIG. 1 an embodiment of a sanding plate according to the disclosure, in a perspective representation,

FIG. 2 the sanding plate according to FIG. 1, in an exploded representation,

FIG. 3 a schematic diagram of a sanding plate according to the disclosure, in a top view, with circumcircles drawn in to elucidate the dimensioning,

FIG. 4 a schematic diagram of a sanding plate according to the disclosure, in a top view, with load points drawn in,

FIG. 5 a schematic diagram of a sanding plate according to the disclosure, in a top view, with a load line drawn in along an edge of the sanding plate,

FIG. 6 a schematic diagram of a sanding plate according to the disclosure, in a top view, with load points drawn in along an arc line of the support element,

FIG. 7 a top view of an embodiment of a sanding plate according to the disclosure, with dimension specifications,

FIG. 8 a cross-sectional drawing through an exemplary embodiment of a sanding plate according to the disclosure,

FIG. 9 an exemplary embodiment of a tool system according to the disclosure.

DETAILED DESCRIPTION

In the figures, components that are the same are denoted by the same references.
An exemplary embodiment of a sanding plate 10 according to the disclosure is represented in FIGS. 1 and 2. The sanding plate 10 has a receiving element 12, realized as a driver element, that serves to fasten the sanding plate 10 to a drive shaft—not represented in FIG. 1 or 2—of an electric power tool, the receiving element 12 being designed to connect the sanding plate 10 to the drive shaft in a rotationally fixed manner. For this purpose, the sanding plate of this exemplary embodiment has a 3-dimensional mechanical interface, as explained in detail in the applications WO 2015/014467 A1, WO 2015/014468 A1, WO 2015/014469 A1. The receiving element 12, which in the exemplary embodiment of FIGS. 1 and 2 is composed of a metal, is fixedly connected to a support element 22 of an elastic, but solid, plastic. The support element 22 is composed of a hard thermoplastic material such as, for example, a polyamide that is also additionally reinforced by glass fibers.
In the exemplary embodiment of FIGS. 1 and 2, the support element 22 is molded around the receiving element 12, in order to produce a firm connection of the two functional elements.
Alternatively, the receiving element 12, which serves as a mechanical interface for fastening the sanding plate 10 to a power tool, could likewise be made of a plastic and, in particular, could be realized so as to be integral with the support element 22.
Fastened to the support element, in turn, is a carrier element 14 of a yielding material 16, in the exemplary embodiment a polyurethane foam material having a Shore 0 hardness of 45. The carrier element 14 may be adhesive-bonded to the support element 22 or molded around the latter.
The carrier element 14 of the sanding plate 10 is disposed on the side of the support element 22 that faces away from the receiving element 12. The support element 22 is composed of a material that is as solid as possible, but that has a certain flexibility. The carrier element 14 in this case is larger than the support element.
In the exemplary embodiment of FIGS. 1 and 2, the carrier element 14 has substantially triangular basic shape, the sides 32, 34, 36 of the triangle being convex, such that they “bulge” outward, i.e. away from the axis of symmetry 60 (see FIG. 2) of the sanding plate.
The support element 22 of the sanding plate 10 likewise has a substantially triangular basic shape, the “triangle tips” of the support element 22 being very rounded and constituted by arc portions 52, 54, 56 (for which, see, for example, FIG. 2). The triangle sides 62, 64, 66 of the support element 22 are substantially parallel to the triangle sides 32, 34, 36 of the carrier element 14.
An abrasive means 28, for example a sanding paper, may be fastened—for example by means of a hook-and-loop fastening (also called Velcro)—to the carrier element 14 of the sanding plate 10.
FIG. 3 shows the geometric dimensioning of a sanding plate 10 according to the disclosure. If a circumcircle 24 is placed around the tips 42, 44, 46 of the triangle of the carrier element 14 of the sanding plate according to the disclosure, and in addition a concentric circumcircle 26 is placed around the support element 22 of the sanding plate 10, then, in the exemplary embodiment of FIG. 3, the radii, or also the diameters, of the carrier-element circumcircle 26 have a ratio of approximately 1.5 to the support-element circumcircle 24. The mid-points of the circumcircles in this case lie on the axis of symmetry 60 of the sanding plate. This means that, in the present exemplary embodiment of a sanding plate according to the disclosure, only two thirds of the radial extent to the triangle tips of the flexible carrier element 14 is supported.
Also possible, alternatively, is a support element 22′ in which two arcs 52′, 54′ of the one support element lie on a circumcircle 26, and a third arc 56′ lies on a circumcircle having a radius 26′ that differs from that of the circumcircle 26. Again in this case, the mid-points of the circumcircles lie on the axis of symmetry 60 of the sanding plate. This would correspond to an isosceles triangle as a support element.
As an alternative to this, it is also possible for the three arcs 52″, 54″ and 56″ of the support element all to lie on differing radii. The mid-points of the circumcircles in this case lie on the axis of symmetry 60 of the sanding plate. In this way, the triangular shape of the support element could be adapted to special requirements.
The region of the carrier element 14 that thus projects over the support region 22, and that consequently has a significantly greater flexibility, is therefore dimensioned according to the disclosure so as to be quite large.
Advantageous effects in respect of the flexibility of the sanding plate are obtained, in particular, if the support region, in a radial direction 38 toward the triangle tips 42, 44, 46 of the carrier element 14, has a relative extent, in respect of the carrier element 14, in the range of from 60% to 80%, in particular in the range of from 65% to 75% of the radial extent of the triangle tips 42, 44, 46. In the present exemplary embodiment of FIG. 3, the carrier element 14 is supported only to approximately 67% in the direction of its corners 42, 44, 46.
These ratios are represented again in FIG. 4. According to the disclosure, the following applies:
0.8≧A/B≧0.6
Within this value range for the overlap of the support of the carrier element, the material hardness (Shore hardness) of the carrier-element material 16 can in each case be used to configure a sanding plate for various special applications. In combination with a Shore 0 hardness for the carrier-element material 16 in the range of from 40 to 50 Shore 0, it is possible to achieve good corner accessibility without a large amount of heat being produced as a result of friction.
A constellation of
0.75≧A/B≧0.65
in combination with a Shore 0 hardness in the range of from 43 to 47 for the carrier-element material 16 has proved to be particularly advantageous.
These conditions are also valid, however, particularly for support elements having merely isosceles or any triangular shapes that therefore have differing circumcircles 26, as described above, in which case at least one radial extent into the “triangle tip” of the support element then fulfills these conditions.
In the range greater than 95% of the radial direction 38 toward the triangle tips 42, 44, 46 of the carrier element 14, the carrier element according to the disclosure has a bevel 58, or slope, by which, for example, interfering contours on the workpiece are rendered more accessible.
In the exemplary embodiment of FIG. 3, this slope, or bevel 58, is realized so as to be substantially parallel to the lateral edges 32, 34, 36, and extends around the entire carrier element.
In the exemplary embodiment of FIG. 3, the dimensions of the carrier element 14 and support element 22 are selected just such that the circumcircle 26 of the support element 22 just intersects the outermost delimitation of the triangle sides 32, 34, 36 of the carrier element 14.
A sanding plate 10 dimensioned thus has proved to be especially advantageous because, on the one hand, it renders possible a quite large unsupported, i.e. also self-supporting, region of the carrier element 14, and therefore of the sanding plate, of from 25% to 35%, calculated from the corners 42, 44, 46 of the carrier element 22 toward the axis of symmetry 60 of the sanding plate 10, or of the support element 22, but at the same time also realizes the necessary stability and solidity of the edges (corresponding to the triangle sides) of the sanding plate.
During machining work, in the case of a sanding plate of the triangular shape presented, also known as a delta sander, there are two extreme load points, which are shown exemplarily in the representation of FIG. 4. On the one hand, this is the region 72 of the triangle tip and, on the other hand, the region of the triangle base line, or lateral line, marked here with the load point 74. Obviously, this applies analogously to all three triangle tips and triangle sides, and depends only on the direction of machining work of the sanding plate.
A special application of such triangular sanding plates is the use of the triangle edges—indicated exemplarily by the broken line 76 in FIG. 5—as is necessary and useful, for example, in sanding along a skirting board. In this case, a constant contact is required for better removal of material, this being realized by means of an edge that is as stiff as possible. Advantageously, the support element 22, with its lateral edges 62, 64, 66, goes up to the bevel region 58 of the lateral edges 32, 34, 36 of the carrier material 16. There remains only an unsupported outer region of approximately 5-10% of the extent of the carrier element in this direction. (For which cf. also the statements relating to FIG. 7). In the case of such a mode of work, the carrier element 14, and the abrasive means 28 fastened to the carrier element 14, can thus be advantageously supported to a great extent by the lateral edge 62, 64, 66 of the support region 22, and therefore also guided. The triangle sides of the carrier element are therefore realized so as to be considerably less flexible than the regions of the triangle tips.
In order to deal with the high loads in the triangle tips 42, 44, 46, in particular of the carrier material 16, the “tips” of the support element 22, which is likewise substantially triangular in form, are very rounded and realized as an arc line 52, 54, 56.
Thus, in the direction 40 perpendicular to the radial direction 38 toward the triangle tips 42, 44, 46 of the carrier element 22, the support element 22 has arcuate delimiting lines 52, 54, 56, which can be described substantially by a radius (for which see, for example, FIG. 6). In the exemplary embodiment of FIG. 6, the circumcircle 26 to be circumscribed around the support element 22 has a radius of approximately 35 mm.
A rounded transition region is thus obtained between the supported part of the carrier element 22 of the sanding plate 10 and the unsupported, self-supporting part. The direction of load, acting primarily on the carrier element 22, is determined by the user, or the user's orientation of the power tool, and/or the contour of the object to be sanded. An arc line 52, 54, 56 of the support element 22, as claimed, in the transition to the unsupported region of the sanding plate is better able to absorb the loads from differing directions (indicated by the circles 76 in FIG. 6), and additionally prevents cutting into the relatively soft carrier material 16. Such cutting-in would necessarily result in breakage of the carrier element 14 and render the sanding plate 10 defective.
An exemplary embodiment of a sanding plate 10 according to the disclosure is again shown in FIG. 7, with the most important dimensionings for this exemplary embodiment.
In the direction R₁toward the triangle tips of the carrier element 14, the support of the carrier element 14 by the support plate 22 is 60% to 80%, depending on the particular application, a ratio of 65% to 75% having proved to be advantageous in this case. There is then also a corresponding ratio between the dimensions A and B in FIG. 7.
In the direction R₂, i.e. in the direction toward the lateral mid-point (82, 84, 86) of the carrier element 14, a significantly larger region of the carrier element 14 is covered, and therefore supported, by the support element 22. Here, the supported region, i.e. the region covered by the support element, is typically 90%, in particular 95%. Thus, in the exemplary embodiment of FIG. 7, only the sloped outer edge 58 is not covered by the support element 22, thus enabling highly supported working via the edges. (For this, cf. the statements relating to FIG. 5).
These dimensions may vary, depending on the field of application of a sanding plate, without departure from the concept according to the disclosure of a relatively large unsupported carrier element of defined material hardness.
With such a sanding plate concept, it is possible to realize an advantageous tool system composed of at least one electric power tool such as, for example, a sander, and a sanding plate according to the disclosure.
FIG. 8 shows a section through a sanding plate 10 according to the disclosure. The receiving element 12 is realized in a raised shape around the axis of symmetry 60 of the sanding plate, the receiving element 12 being realized to connect the sanding plate 10 to a drive shaft of an electric power tool in a rotationally fixed manner. The support element 22, which is composed of a plastic, is molded around the receiving element 12, which, in the exemplary embodiment of FIG. 8, is composed of a metal. The support element 22, in turn, is fixedly connected to the soft and flexible carrier element 14, which has bevels 58 toward its edges. The carrier element 14 of the sanding plate 10 is disposed on the side of the support element 22 that faces away from the receiving element 12. On its underside, i.e. the side that faces away from the receiving element 12, the carrier element has a hook-and-loop tape or surface 78 (Velcro) for fastening an abrasive means to the sanding plate 10.
FIG. 9 shows such a tool system 210, on the basis of a hand-held sander 110 having an oscillating drive shaft 100 and the sanding plate 10 according to the disclosure from FIG. 1.
The sanding plate 10 in this case is fastened to the drive shaft 100 of the electric power tool in a rotationally fixed manner by means of the receiving element 12, such that the axis of symmetry 60 of the sanding plate is in alignment with the axis 102 of the drive shaft 100. The support element 22 in this case comes to lie in the plane 104.
The electric power tool 110 may advantageously be operated by battery, or storage battery, and thus be independent of a mains power supply. In particular, this renders workpieces more accessible. In particular, against the background of the object on which the disclosure is based, a sander that is independent of a mains power supply enables the tool system according to the disclosure to be used in a very flexible manner. In particular, the storage battery may be constituted by a lithium chemistry such as, for example, lithium-ion, lithium-iron, lithium-phosphorus or, also, lithium-sulfur. Already, at present, such storage batteries provide for a very high power density, such that the appliances, in turn, can be of a quite small structural size.
Small, powerful sanders, in combination with the sanding plate according to the disclosure, render the claimed tool system suitable for a very great variety of applications.
Alternatively, taking account of the known disadvantages, the tool system according to the disclosure may obviously also be realized for mains power operation, in order to ensure continuous operational readiness.
Such a tool system according to the disclosure is suitable for a wide range of application, in particular as a result of the sanding plate according to the disclosure being adapted to/designed for the specific task. Advantageously, in particular, both large-area sanding of workpieces and good corner accessibility are made possible. The tool system according to the disclosure is thus suitable, and particularly when the appropriate abrasive means such as, for example, sanding papers, are selected, both for use in the field of professional trades, in which there is typically a requirement for large-area sanding of workpieces, and for DIY use, in which the focus is on a shorter operating time and the machining of edges and corners.
The sanding plate according to the disclosure and the tool system according to the disclosure are not limited to the exemplary embodiments shown. Rather, the disclosure is defined by the claims.

Claims

What is claimed is:

1. A sanding plate for a hand-guided electric power tool, comprising:

a receiving element configured to fasten the sanding plate to a drive shaft of the electric power tool, the receiving element further configured to connect the sanding plate to the drive shaft in a rotationally fixed manner; and

a carrier element comprised of at least one yielding material, the carrier element at least partially supported by a support element that is connected to the receiving element, the ratio of the radii of a circumcircle to circumscribe the carrier element to at least one circumcircle to circumscribe the support element being in a range of from 1.3 to 2.

2. The sanding plate according to claim 1, wherein the carrier element is disposed on a side of the support element that faces away from the receiving element.

3. The sanding plate according to claim 1, wherein the carrier element has a substantially triangular base with convex sides.

4. The sanding plate according to claim 1, wherein the carrier element has a material hardness in the range of from 40 to 50 Shore 0

5. The sanding plate according to claim 1, wherein the support element, in a radial direction toward triangle tips of the carrier element, has a relative extent, in respect of the carrier element, that is in a range of from 60% to 80% of a radial extent of the triangle tips.

6. The sanding plate according to claim 1, wherein the support element, in a radial direction toward triangle sides of the carrier element, has a relative extent, in respect of the carrier element, that is greater than or equal to 90% of a radial extent of the triangle sides.

7. The sanding plate according to claim 1, wherein the support element, in a direction perpendicular to a radial direction toward triangle tips of the carrier element, has at least one arcuate delimiting line.

8. The sanding plate according to claim 7, wherein the support element, in the direction perpendicular to the radial direction toward the triangle tips of the carrier element, has three arcuate delimiting lines of equal curvature.

9. The sanding plate according to claim 7, wherein the support element, in the direction perpendicular to the radial direction toward the triangle tips of the carrier element, has three arcuate delimiting lines with at least two of the three arcuate delimiting lines having differing curvatures.

10. An electric power tool system, comprising:

at least one electric power tool having a drive shaft; and

a sanding plate, including:

a receiving element configured to fasten the sanding plate to the drive shaft, the receiving element further configured to connect the sanding plate to the drive shaft in a rotationally fixed manner; and

11. The electric power tool system according to claim 10, further comprising at least one abrasive device configured as a sanding paper.

12. The sanding plate according to claim 1, wherein the sanding plate is configured for a sander having an oscillating drive shaft.

13. The sanding plate according to claim 1, wherein the ratio of the radii of the circumcircle to circumscribe the carrier element to the at least one circumcircle to circumscribe the support element is in a range of from 1.4 to 1.5.

14. The sanding plate according to claim 4, wherein the material hardness of the carrier element is in the range of from 43 to 47 Shore 0.

15. The sanding plate according to claim 5, wherein the relative extent of the support element is in the range of from 65% to 75% of the radial extent of the triangle tips.

16. The sanding plate according to claim 6, wherein the radial direction is toward lateral mid-points of the carrier element, and wherein the relative extent is equal to 95% of the radial extent of the triangle sides.

17. The electric power tool system of claim 10, wherein the at least one electric power tool is configured as a sander and the drive shaft is configured as an oscillating drive shaft.