EP2669044B1 - System with a hand-held machine tool and a plate tool - Google Patents

Description

The invention relates to a system comprising a plate tool and a hand machine tool in the form of a grinder or polishing apparatus, which has a tool shaft and a drive motor for rotationally driving the tool shaft about an axis of rotation, the system having a holding arrangement for holding the plate tool comprising the tool shaft, wherein the holding arrangement comprises a tool holder arranged on the tool shaft and a machine holder arranged on the plate tool, wherein the tool holder and the machine holder have a plug projection and a plug receptacle which are adapted to take a plug position along a plug axis can be plugged into each other, in which a rotational drive outer peripheral contour of the plug projection positively and rotationally rests against a rotary driving inner peripheral contour of the plug receptacle, wherein the rotary driving outer peripheral contour and the rotary driving inner peripheral contour a substantially round, in particular krei Round, base contour include, at the tangentially laterally opposite sides of the rotary driving Außenumfangskontur or on opposite sides of the rotary driving Innenumfangskontur rotational driving flattenings for rotationally fixed engagement of the rotary driving outer peripheral contour in the rotary driving Innenumfangskontur available. Such a system is for example from the DE-A-4421480 known.

The hand-held power tool is, for example, a grinder or a polishing machine driven by an electric motor or a pneumatic motor. The platen tool, such as a grinding or polishing disc, may be secured to a bottom surface of the grinder or polisher by means of the holding arrangement so that the drive motor can drive the platen tool. The plate tools rotate, for example, directly around the axis of rotation or about an axis of rotation eccentric tool axis. The holding arrangement must ensure a rotationally fixed hold of the plate tool with respect to the axis of rotation and optionally the tool axis.

In a grinding or polishing device from the applicant's current program, a plug-in projection is provided on a rotary driving body, which is mounted eccentrically on a motor shaft by means of a bearing arrangement and thus represents a tool shaft, which is round on its outer circumference, but two lateral flattening in, which are provided for a rotationally fixed stop in a plug-in receptacle on the plate tool and abut there form-fitting on two likewise lateral flattenings of the per se circular plug-in receptacle. The torque that can be transmitted depends on the geometry of the lateral flats.

It is therefore the object of the present invention to provide an improved rotational drive in a holding arrangement of a system consisting of plate tool and hand machine tool.

To solve the problem is provided in a system of the type mentioned that at one extending between the rotary driving flattening rotational drive portion of the rotary driving outer peripheral contour at least one before the round base contour projecting rotational drive projection for engagement in a disposed between the rotational driving flattenings of the rotary driving inner peripheral contour rotary driving recess is provided. Furthermore, a plate tool and a hand-held machine tool to solve the problem are provided.

The invention thus comprises a system comprising a plate tool and a hand machine tool in the form of a grinding or polishing apparatus, which has a tool shaft and a drive motor for rotationally driving the tool shaft about an axis of rotation, wherein the system is a holding arrangement with a tool holder the tool shaft and a machine holder on the plate tool, wherein the tool holder and the machine holder have a plug projection and a plug-in receptacle, which are plugged into one another, so that a rotary driving outer peripheral contour of the plug projection positively and rotationally fixed to a rotary driving inner peripheral contour the plug-in receptacle rests, wherein the outer peripheral contour and the inner peripheral contour comprise a substantially circular base contour on which tangentially laterally rotary driving flattenings are provided for rotationally fixed engagement. In the system, it is provided that at least one rotational drive projection protruding in front of the round base contour on a rotational drive section extending between the rotary driving flattened portions for engagement in a rotary driving recess arranged between the rotational driving flattenings of the rotary driving internal peripheral contour is provided.

It is a basic idea that the rotational drive on the one hand on the already known rotational driving flattening, but in addition at least one, preferably two rotational driving Vörsprünge are provided which are positively engageable with one or two rotational driving recesses on the plug-in receptacle and so the total rotational drive improve. It is understood that a plug-in receptacle can also have only one rotary driving recess, while the plug-in projection has two rotary driving projections. Then only just a rotational drive projection passes into positive engagement with a corresponding rotary driving recess, while the other rotational drive projection, for example, is free in the socket and does not cause rotational drive.

At this point, the compatibility with the existing system should also be mentioned. If, for example, the plug-in receptacle has, for example, one or two rotational-engagement recesses, but otherwise still the round base contour with the two lateral flattenings, an already existing component, for example the plug-in projection located at the hand-held machine tool, can also be present This novel plug-in receptacle are plugged in, so that, for example, plate tools new type of hand-held machine tools (grinder or polisher) old design can be used. Thus, therefore, a preferred embodiment of the invention is such that a geometry of the plug-in receptacle to a plug projection of the holding assembly according to the preamble of claim 1 and accordingly correspond to the round, in particular circular, basic contour and the lateral flattening of the inner peripheral contour with the outer peripheral contour of a male projection known type , in particular have identical dimensions.

It should be noted that although it is preferred that the plug projection on the tool holder of the hand-held machine tool and the plug-in receptacle are arranged on the machine holder of the plate tool. Of course, but the reverse arrangement is possible, ie that the plug-in receptacle on the hand-machine tool, the plug-in projection, however, is provided on the plate tool.

An outer periphery of a free end of the rotational drive projection advantageously has a rounding concentric with the round base contour. In this case, for example, a radius of the base contour may be smaller than or equal to the radius of the free end of the rotary driving projection. The rotary drive projection round on its free end is e.g. easier to insert into the socket.

Also with respect to a bottom of the rotary driving recess for engagement of a free end of the rotary driving projection, it is advantageous if it has a concentric inner contour to the round base contour.

Advantageously, the arrangement is such that the bottom of the rotary driving recess and the free end of the rotary driving projection mutually form-fitting matching contours, for example, round contours. But it is also possible that the contours at the free end of the projection and the bottom of the recess, for example, are rectilinear, polygonal or the like.

The rotary driving recess and / or the rotary driving projection have expediently to the rotational driving flattenings approximately parallel side surfaces. These side surfaces may be parallel or even slightly, for example, slightly to each other or away from each other, so that the recess or the projection have a total wedge-shaped course. It is possible that the rotational drive projection is narrower towards its free end or wider, wherein the rotary driving recess is expediently configured corresponding thereto.

At a transition region of the rotary driving projection to the circular or round base contour are expediently Provided rounding. This applies mutatis mutandis to the rotary driving recess, which passes conveniently with a round course in the round base contour. The curves of the base contour and the transition region between rotational drive projection or rotary driving recess are expediently in opposite directions.

Preferably, the arrangement is such that on two opposite sides of the rotary driving outer peripheral contour each one in front of the round base contour projecting rotary driving projection is arranged. For example, the flats and the rotary driving projections are each offset by 90 ° rotation angle.

In a frontal perspective, the two inner and / or outer peripheral contours are preferably made so that virtually the round base contour is superimposed on an approximately rectangular contour, so that each side portions of the rectangular contour protrude laterally in front of the round, in particular circular, base contour.

Analogously, this measure is also advantageous with respect to the rotary driving recess, that is, in each case preferably provided on two opposite sides of the rotary driving inner peripheral contour a rotary driving recess. Also with respect to the rotary driving inner peripheral contour is expediently the rotation angle _ offset of 90 ° between rotational driving flattening and rotary driving recesses appropriate.

An advantageous embodiment of the system according to the invention, ie the plate tool and / or the hand-held machine tool, provides that the rotary driving inner peripheral contour and / or the rotary driving outer peripheral contour in the manner of a double salmon are configured, ie, that the rotary driving Innenumfangskontur or the rotary driving Außenumfangskontur rotational driving flattenings which run parallel to each other and before the flattened portion of the rotary driving Innenumfangskontur and / or the rotary driving Außenumfangskontur radially outward at one or both opposite Side rotary driving projections or on one or both opposite sides rotary driving recesses are present.

It is advantageous if exactly two rotary driving projections and / or exactly two rotary driving recesses are present. Although it is a preferred embodiment that the rotary driving projections and the rotary driving recesses are each angularly offset by 180 ° to each other, as opposed to each other or are opposite to each other. Of course, however, other angular positions, for example, of 120 ° or the like are possible.

The plug-in receptacle expediently has a passage opening. The plug-in projection has a screw-in opening. Through the passage opening and the screw-through opening, a fastening bolt, for example a screw, a bayonet element or the like, can be pushed through. The fastening bolt can be screwed, for example, through the passage opening into the screw-in opening in order to fix the machine holder and the tool holder with respect to the thru-axle to one another.

The axis of rotation and / or the plug-in axis expediently form the center of the round base contour or pass through the center.

It should be noted that the plug-in axis is preferably aligned with a tool axis, wherein the tool axis may be concentric to the axis of rotation or eccentric. If the axis of rotation and the tool axis are concentric, it is particularly advantageous if the through axle is aligned with these axes. But it is also possible that the plug-in axis is parallel to the axis of rotation, for example, when the plug-in axis and the axis of rotation are eccentric to each other.

The hand-held machine tool or the tool holder are expediently designed to be eccentric relative to the axis of rotation of the plate tool. For this example, a bearing assembly is provided. The bearing arrangement is arranged, for example, on an end face of the drive shaft of the drive motor. An eccentricity can also be achieved without such a bearing arrangement.

Figur 1

eine Querschnittsansicht eines Systems umfassend eine Hand-Werkzeugmaschine mit einer mittels einer Halteanordnung daran montierten Teller-Werkzeug,

Figur 2

eine perspektivische Schrägansicht eines an der Hand-Werkzeugmaschine vorgesehenen Drehmitnahmekörpers der Halteanordnung gemäß Figur 1,

Figur 3

eine hintere stirnseitige Frontalansicht des Drehmitnahmekörpers gemäß Figur 2,

Figur 4

eine perspektivische Schrägansicht eines bekannten Drehmitnahmekörpers,

Figur 5

eine hintere stirnseitige Frontalansicht des Drehmitnahmekörpers gemäß Figur 4,

Figur 6

eine Draufsicht auf das Teller-Werkzeug gemäß Figur 1,

Figur 7

eine Querschnittsansicht entlang einer Schnittlinie B-B durch das Teller-Werkzeug gemäß Figur 6,

Figur 8

eine Draufsicht auf ein in

Figur 9

perspektivisch dargestelltes Stützteil für das Teller-Werkzeug gemäß Figur 6.

Hereinafter, an embodiment of the invention will be explained with reference to the drawing. Show it:

FIG. 1

a cross-sectional view of a system comprising a hand-held machine tool with a plate tool mounted thereon by means of a holding arrangement,

FIG. 2

an oblique perspective view of provided on the hand-held power tool rotational drive body according to the holding arrangement FIG. 1 .

FIG. 3

a rear frontal front view of the rotary driving body according to FIG. 2 .

FIG. 4

a perspective oblique view of a known rotary drive body,

FIG. 5

a rear frontal front view of the rotary driving body according to FIG. 4 .

FIG. 6

a plan view of the plate tool according to FIG. 1 .

FIG. 7

a cross-sectional view along a section line BB through the plate tool according to FIG. 6 .

FIG. 8

a top view of an in

FIG. 9

in perspective shown support member for the plate tool according to FIG. 6 ,

In FIG. 1 a handheld power tool 10 is shown in the form of a polisher or grinder. Depending on the used on the plate tool 50, the hand-held machine tool can namely be used for example for polishing a substrate, for grinding a workpiece or the like. In a housing 11 of the hand-held power tools 10, a drive motor 12 is received, in the embodiment, a pneumatic drive motor. Of course, the invention can also be used in connection with electric hand-held machine tools, ie that the drive motor 12 would be an electric drive in this case. That does not matter.

In any case, drives a rotor 13 which is housed in a housing of the drive motor 12 or a stator (the electric motor), a drive shaft 14 rotationally, so that it rotates about an axis of rotation 15. A tool axis 16 of a tool shaft 17 also rotates about the axis of rotation 15, but additionally around a tool axis 16, which has an eccentricity 20 to the axis of rotation 15. The tool shaft 17 is disposed on a front of the drive motor 12 projecting portion of the drive shaft 14. There is a camp recording 18, in which a bearing assembly 19, for example, a roller bearing or the like, is received. The bearing assembly 19 supports the tool shaft 17 rotatably and eccentrically with respect to the axis of rotation 15th

The platen tool 50 would in itself, upon rotational driving of the drive shaft 14 about the rotation axis 15, fully participate in the rotational movement about the rotation axis 15 and accelerate up to the speed of the drive shaft 14, but will be prevented from "spinning" by a seal 21 or other brake. hindered so to speak, so that the rotational movement about the rotation axis 15 is a rotational movement about the axis of rotation of the bearing assembly 19, so the tool axis 16, superimposed, so that the tool shaft 17 and arranged on her plate tool 50 undergo a so-called hypercycloid movement.

The drive motor 12 can be supplied with compressed air via a compressed-air connection 23 on a handle portion 22 arranged at the rear of the housing 11, it being understood that, for example, a connection for an electric cable of a drive motor to be operated electrically would also be possible there.

On a top 24 of the housing 11 is a switching element 25 which is operable by the operator to turn on the drive motor 12, turn off or adjust its speed.

On a bottom 26 of the housing 11 is the plate tool 50th

The plate tool 50 is, for example, a grinding tool or a polishing tool. At a relatively rigid support body 51 is a soft, resilient plate body 52, for example made of foam or other elastic compliant material. The plate body 52 has at its free, remote from the hand machine tool 10 side a grinding or polishing 53, for example, an abrasive sheet, a polishing surface or the like. The abrasive or polishing agent 53 may be detachably attachable to the plate body 52, for example in a conventional manner by means of a Velcro connection. Of course, a grinding or polishing agent can also form an integral part of the plate tool, so for example be arranged directly on the plate body 52. That does not matter.

The holding arrangement 80 comprises a tool holder 30 provided on the hand-held machine tool 10 and a machine holder 60 provided on the plate tool 50. The tool holder 30 comprises a plug-in projection 31 which can be inserted into a plug-in receptacle 61 of the machine holder. The plug-in projection 31 is provided on a rotary driving body 32, which in turn is in turn received with a shaft 33 in a receptacle 27 of the bearing assembly 19. The rotational driving body 32 integrally forms the tool shaft 17, wherein it would be readily possible to provide the rotary driving body as a separate component of the tool shaft.

For example, the shaft 33 can be pressed into the receptacle 27, screwed or otherwise secured in the receptacle 27. In the present case, however, the shaft 33 penetrates the receptacle 27, so that a free end 34 of the shaft 33 protrudes in front of the bearing assembly 19 on a side remote from the tool holder 30 and is secured there by means of a securing ring 28 which engages in a groove 35 on the shaft 33 ,

On the side facing away from the end 34 of the shaft 33, a step 36 is provided with the rotary driving body 32 on the other hand supported on the bearing assembly 19, so that the bearing assembly 19 when the rotary driving body 32 is attached to her, between the step 36 and the locking ring 28 is arranged.

The plug-in projection 31 can positively engage in the plug-in receptacle 61, for which the plug-in projection 31 has a rotational drive outer peripheral contour 40, which fits in a form-fitting manner to a rotational drive inner peripheral contour 70 of the plug receptacle 61. The rotational drive outer peripheral contour 40 of the plug-in projection 31 is provided at one end 37. The two ends 34, 37 are mutually opposite longitudinal ends of the rotary driving body 32nd

When the plug-in projection 31 is inserted into the plug-in receptacle 61, its end face 38 bears against a bottom 62 of the plug-in receptacle 61. Preferably, the end face 38 and the bottom 62 are flat or flat, with curved contours are readily possible. In any case, it is advantageous if in the inserted state of the tool holder 30 and the machine holder 60 is also an end-side, in particular form-fitting, support is given - which is advantageous in the rest of each tool-holding arrangement according to the invention.

On the end face 38 of the rotary driving body 32 is a screw-in opening 39 for screwing a screw 81. At the bottom 62, a passage opening 63 is further provided for the screw 81, which forms a fastening bolt. The screw 81 can thus be inserted through the passage opening 63 and screwed into the screw-in opening 39 when the plug-in projection 31 is inserted into the plug-in receptacle 61. The head of the screw 81 relies on that of the Plug projection 31 opposite side of the bottom 62 forming wall 64 from. Conveniently, a washer 82 is disposed between the head of the screw 81 and the wall 64, but this is not necessary. In any case, the screw 81 secures the connection between the tool holder 30 and the machine holder 60 to train with respect to the thru axle or the tool axis sixteenth

The rotational drive inner peripheral contour 70 and the rotary driving outer peripheral contour 40 have a circular base contour 71 and 41, respectively. The basic contour 71, 41 is concentric with the tool axis 16, which at the same time represents a plug-in axis of the plug connection between the plug-in projection 31 and the plug-in receptacle 61.

The rotary driving outer peripheral contour 40 is provided on at the end face 38 rectangular peripheral wall surfaces 46 of the male projection 31. It is understood that between the end face 38 and the peripheral wall surfaces 46, other angles are possible, for example, such that the plug projection 31 tapers towards its end face.

Between the peripheral wall surfaces 46 and the end face 38 advantageously round transition surfaces 47 are provided.

In order that the peripheral contours 40, 70 can engage with one another in a rotationally fixed manner, rotary driving flattenings 42, 72 are provided on opposite sides of the circumferential contours 40, 70. The flats 42, 72 have a straight course.

The rotational drive between the tool holder 30 and the machine holder 60 is also improved by rotational drive projections 43 of the outer peripheral contour 40, which engage positively in corresponding rotary driving recesses 73 of the inner peripheral contour 70. The rotary driving projections 43 are provided between the flats 42, the rotary driving recesses 73 between the flats 72.

Conveniently, an angle of 90 ° between flattening and projection or flattening and recess is provided, of course, other angles are possible - which is advantageous in the rest of each tool-holding arrangement according to the invention.

Furthermore, further rotational driving projections may be advantageous, so that, for example, between the flats 2 spread-foot-like projections are provided in corresponding recesses of the inner peripheral contour.

A free end 44 of a respective rotational drive projection 43 has a round contour, which fits to a correspondingly also round inner contour of a bottom 74 of a rotary driving recess 73.

Transition regions 45, 75 extending between the base contour 41, 71 and a rotational drive projection 43 or a rotary driving recess 73 are expediently likewise rounded.

One in the FIGS. 4 and 5 illustrated rotary drive body 132 of a conventional tool holder 130 has partially similar or identical components as the rotary drive body 32, for the same reference numerals are used. As far as the components differ, 100 larger reference numerals are used. For example, the rotary driving body 132 has an outer peripheral contour 140 that has the flats 42, but not the rotary driving projections 43. Thus, the rotary driving body 132 fits in the socket 61, so that the Plate tool 50 is compatible with a conventional hand machine tool having a tool holder 130 of known type.

The support body 51 is relatively rigid. For example, the preferably plate-like support body 51 is a fiber-reinforced support body made of plastic. Particularly preferably carbon fibers and / or aramid fibers are provided in the support body 51, so that it has a relatively high bending stiffness. In addition, a rib structure 54 is provided on an upper side of the plate tool 50, in this case the support body 51, in particular in the region of the plug-in receptacle 61. The radially outer regions of the support body 51 are unreinforced and plate-like, so that they are somewhat more yielding.

It should be noted at this point that the plate tool of a system according to the invention of course does not have to be round as shown in the drawing, but may also have any other shapes, for example a triangular shape, a rectangular shape, a Wankelform or the like.

A passage opening 55 passing through the grinding / polishing means 53, the plate body 52 and the support body 51 and aligned with the passage opening 63 makes it possible to actuate the fastening bolt or the screw 81.

The relatively strong and mechanically loadable base material of the support body 51 would in itself make it possible to form the plug receptacle 61 completely in the support body 51. For example, namely, the rotary driving recesses 73 are formed directly in the support body 51, for example by a plastic-casting process.

However, the support body 51 is additionally reinforced by a support member 90, which consists for example of metal. The support member 90 has a plate-like base body 91, on the upper side of a recess 92 is provided. The bottom of the recess 92 forms the bottom 62 of the plug-in receptacle 61. The passage opening 63 is provided on the bottom 62.

On its underside, the support member 90 has a ring portion 93 which projects downwardly in front of the underside of the support member 90. This ring portion 93 and a radially outwardly of the ring portion 93 projecting edge portion 94 of the body 91 are embedded in the base material of the support body 51, for example, overmolded with the base material. An even better grip of the support member 90 in the support body 51 also contributes to the fact that on the outer peripheral edge of the edge portion 94 recesses 95, for example, notch-like depressions are provided, which are penetrated by the base material of the support body 51.

The bottom 62 forming recess 92 has rectilinear side walls 96 which are aligned with the flats 72 and at least partially form them. Thus, the recess 92 and the support member 90 makes a lateral rotation support for the male projection 31. In the area of the rotary driving recesses 73, however, the recess 92 is further recessed, so that the rotary driving projections 43 are not there on the recess 92nd or on the support member 90, but on the material of the support body 51. Exemplary is in FIG. 8 drawn in a projection from above the rotary drive inner peripheral contour 70. It can also be seen that the hitherto conventional rotational drive body 132, whose outer peripheral contour 140 has the base contour 140 and the flattenings 42, fits into the plug-in receptacle 61 and can be supported on the side walls 96 of the support part 90.

However, the support member 90 is not essential. It is understood that an inventive plate tool can get along without such a support member. This is particularly true if, for example, the support body of the plate tool has a fiber reinforcement, in particular with carbon fibers or the like.

Furthermore, a slightly simpler support member may be provided, for example, without the ring portion 93, which in FIG. 1 is indicated. The support member 190 drawn there has, for example, only a plate-shaped base body whose outer wall is embedded in the material of the support body 51.

Claims (15)

1. System comprising a disc tool (50) and a hand-operated power tool (10) in the form of a grinding tool or polishing tool, having a tool shaft (17) and a drive motor (12) for rotary driving of the tool shaft (17) around a rotation axis (15), wherein the system includes a holding arrangement (80) for holding the disc tool (50) to the tool shaft (17), wherein the holding arrangement (80) includes a tool holder (30) fixed to the tool shaft (17) and a machine mounting (60) fixed to the disc tool (50), wherein the tool holder (30) and the machine mounting (60) have a plug-in projection (31) and a plug-in socket (61) which may be plugged into one another to assume a plugged position along an insertion axis in which a rotary-driving outer peripheral contour (40) of the plug-in projection (31) is in positive-locking and non-rotatable contact with a rotary-driving inner peripheral contour (70) of the plug-in socket (61), wherein the rotary-driving outer peripheral contour (40) and the rotary-driving inner peripheral contour (70) comprise a substantially round, in particular circular, basic contour (41, 71), on which tangentially at the side, on opposite sides of the rotary-driving outer peripheral contour (40) and on opposite sides of the rotary-driving inner peripheral contour (70) respectively, there are provided rotary-driving flat sections (42, 72) for non-rotatable engagement of the rotary-driving outer peripheral contour (40) in the rotary-driving inner peripheral contour (70), characterised in that there is provided, on a rotary driving section of the rotary-driving outer peripheral contour (40) extending between the rotary-driving flat sections (42, 72), at least one rotary-driving projection (43) projecting above the round basic contour (41, 71) for engagement in a rotary-driving recess (73) located between rotary-driving flat sections (42, 72) of the rotary-driving inner peripheral contour (70).
2. System according to claim 1, characterised in that an outer periphery of a free end of the rotary-driving projection (43) has a rounding concentric to the round basic contour (41, 71).
3. System according to claim 1 or 2, characterised in that a base (74) of the rotary-driving recess (73) has an internal contour concentric to the round basic contour (41, 71) to engage a free end of the rotary-driving projection (43).
4. System according to any of the preceding claims, characterised in that the rotary-driving recess (73) and/or the rotary-driving projection (43) have side faces running roughly parallel to the rotary-driving flat sections (42, 72).
5. System according to any of the preceding claims, characterised in that there is provided on each of two opposite sides of the rotary-driving outer peripheral contour (40) a rotary-driving projection (43) protruding above the basic contour (41, 71), and/or that a rotary-driving recess (73) is provided on each of two opposite sides of the rotary-driving inner peripheral contour (70).
6. System according to any of the preceding claims, characterised in that the plug-in projection (31) is located on the tool holder (30) of the hand-operated power tool (10) and the plug-in socket (61) on the machine mounting (60) of the disc tool (50).
7. System according to any of the preceding claims, characterised in that the plug-in socket (61) has a through hole (63) and the plug-in projection (31) a screw-in orifice (39) for a mounting bolt (81), such that the mounting bolt (81) may pass through the through hole (63) and be screwed into the screw-in orifice (39), in order to fix the machine mounting (60) and the tool holder (30) so as to be tension-resistant relative to the insertion axis.
8. System according to any of the preceding claims, characterised in that the rotation axis (15) and/or the insertion axis pass through the centre of the round basic contour (41, 71), and/or the rotation axis (15) and the insertion axis are parallel or aligned with one another.
9. System according to any of the preceding claims, characterised in that a base of the plug-in socket forms a counter-bearing face for an end face (38) of the plug-in projection (31).
10. System according to any of the preceding claims, characterised in that the hand-operated power tool (10) or the tool holder (30) are designed for eccentric bearing of the disc tool (50) relative to the rotation axis (15) in particular with the aid of a bearing assembly (19).
11. Hand-operated power tool (10) in the form of a grinding tool or polishing tool of a system according to any of the preceding claims, wherein the hand-operated power tool (10) has a tool shaft (17) and a drive motor (12) for rotary driving of the tool shaft (17) around a rotation axis (15), together with the tool holder (30) of the holding arrangement (80) for holding the disc tool (50) to the tool shaft (17).
12. Disc tool (50) of the system according to any of claims 1 to 10 for a hand-operated power tool (10) in the form of a grinding tool or polishing tool, wherein the disc tool (50) has the machine mounting (60) of the holding arrangement (80) for fastening to the tool holder (30), which is mounted on a tool shaft (17) of the hand-operated power tool (10) which may be rotary-driven around a rotation axis (15) by a drive motor (12) of the hand-operated power tool (10).
13. Disc tool according to claim 12, characterised in that the machine mounting (60) is provided on a support body (51) of the disc tool (50) which is flexurally stiff , in particular fibre-reinforced, for example by carbon fibres or aramid fibres, and on which is mounted a flexible plate body, in particular of plastic material, the free side of which is provided for workpiece machining or to carry a grinding agent or polishing agent.
14. Disc tool according to claim 13, characterised in that the machine mounting (60) includes a support part (90), in particular made of metal, to support the tool holder (30) and which is embedded in the support body (51).
15. Disc tool according to claim 14, characterised in that the support part (90) has holding contours extending along the rotary-driving flat sections and forming part of the rotary-driving inner peripheral contour (70), and the rotary-driving inner peripheral contour (70) or the rotary-driving outer peripheral contour (40) in the area of the rotary-driving projection (43) or the rotary-driving recess (73) respectively is formed by the support body (51).

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