Hand grinder with motor housing and energy storage interface

Abstract

The invention relates to a hand grinder having a disk tool 40 with a working surface 44 for machining a workpiece WST and a machine housing 50 in which a drive motor 11 is arranged for driving a tool receptacle 14 in which the disk tool 40 is arranged, the machine housing 50 having a drive part 51 with a motor housing 52 having a motor receiving space 55 in which the drive motor 11 is received, the motor housing 52 having an integral peripheral wall 53 surrounding the motor receiving space 55 in an annular manner. It is envisaged that a connecting projection 62 is arranged in the peripheral wall 53, which extends along the longitudinal machine axis LM of the machine housing 50 and is in particular integral with the machine housing 50, and on which an energy accumulator interface 80 is arranged for removably connecting an electrical energy accumulator 90 for the electrical energy supply of the hand grinder 10.

Description

[Technical field]

[0001] The present invention relates to a hand grinder (hand-held grinding and polishing machine), which has a disk tool with a processing surface for processing a workpiece, and a machine housing in which a drive motor is arranged for driving a tool receiving part in which the disk tool is arranged, wherein the machine housing has a drive part with a motor housing having a motor receiving space in which the drive motor is received, wherein the motor housing has an integral peripheral wall portion that surrounds the motor receiving space in an annular shape. [Background technology]

[0002] The circumferential wall is, for example, in the form of a cylindrical circumferential wall. The motor receiving space has, for example, the shape of a cylinder, which is delimited on the circumferential side by the circumferential wall. It is preferred if the circumferential wall has a circular inner contour. However, it is also possible for the motor receiving space to have another cross-sectional geometry, for example a polygonal cross-sectional geometry or a cross-sectional geometry with at least one corner. In order to hold the drive motor against relative rotation, at least one anti-rotation contour is provided in the motor receiving space, which is particularly advantageous, for example, by a non-circular cross-section of the motor receiving space and / or by a protrusion, in particular a rib, which protrudes into the motor receiving space or by a form-locking receptacle in which a contour of the drive motor engages or can engage.

[0003] The motor housing serves to protect the drive motor and, in addition, contributes to the rigidity of the machine housing. For the current supply, a power cable is regularly used for connection to an electrical energy supply network. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] DE 102018103767 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the range of use of hand grinders of this kind is limited by the need for an electrical energy supply network for the current supply.

[0006] SUMMARY OF THE PRESENT EMBODIMENT It is therefore an object of the present invention to provide an improved hand grinder. [Means for solving the problem]

[0007] To achieve this object, it is provided that in a hand grinder of the type described at the beginning, a connecting projection is arranged on the peripheral wall, which extends along the machine longitudinal axis of the machine housing, and on which an energy accumulator interface is arranged for removably connecting an electrical energy accumulator for the electrical energy supply of the hand grinder.

[0008] The circumferential wall is thus a continuous circumferential wall and / or a circumferential wall consisting of or formed by a single object. The circumferential wall is not formed by assembling two housing halves or half shells, but is an integral component. However, other parts of the machine housing can be manufactured from the housing part, i.e. other parts of the machine housing can be added, for example, to the circumferential wall or to a base body which comprises the circumferential wall. An integral circumferential wall advantageously provides rigidity and strength to the engine receiving space.

[0009] The peripheral wall is made of, for example, plastic.

[0010] Overall, it is advantageous if the machine housing consists entirely or partly of plastic.

[0011] The connecting projection is, for example, integral with the machine housing, but it is also conceivable that the connecting projection is fixedly connected to the machine housing, for example positively connected, in particular screwed and / or plugged into the machine housing, and / or materially connected to the machine housing, for example glued and / or welded to the machine housing.

[0012] The basic idea here is that the motor housing protects the drive motor by means of its peripheral wall, but nevertheless provides an energy storage interface for connecting an electrical energy storage, for example for connecting a battery pack.Compared to simple power supply interfaces or connecting cables for electrical energy supply via an energy supply network, the energy storage interface for connecting an energy storage or a battery pack is relatively large, so that typically in hand grinders a machine housing is provided with half shells or housing parts, and the energy storage interface is held between the half shells or housing parts.

[0013] A preferred concept provides that the hand grinder has a hand grip part at which it can be held by the operator and guided forward along the workpiece, in particular in a working direction parallel to or having a parallel directional component with the longitudinal machine axis of the machine housing, with the connecting projection and / or at least a part of the hand grip part projecting rearward in the working direction from the motor housing, so that the hand grinder can be operated comfortably.

[0014] The handgrip part is advantageously arranged on a handgrip body arranged on the machine housing, in particular at least partially integral with the machine housing, which handgrip body projects rearward from the motor housing in the working direction. The handgrip body may be one-piece or multi-piece. It is preferred if the handgrip body comprises a housing body as one handgrip body part which is integrally or fixedly connected to the machine housing and which is connected or closed by a housing cover as the other handgrip body part.

[0015] The connection projection with the energy storage interface can cooperate with the handgrip body. For example, the handgrip body is supported by the connection projection. However, it is also possible for the connection projection to completely or partially form the handgrip body. For example, arrangements are also possible in which the connection projection can be held by the operator, but in addition, the handgrip body is provided for holding by the operator.

[0016] An advantageous concept provides that the hand grip body and the connecting projection are directly connected to one another in one end region facing away from the motor housing. A connection is advantageously provided for the other end region of the hand grip body and the connecting projection as well. It is preferable for the hand grip body and the connecting projection to be connected to one another in the region of the motor housing by the motor housing. However, it is also possible for the connecting projection and the hand grip body to be directly connected to one another in the vicinity of the machine housing. This measure can advantageously contribute to the rigidity of the machine housing and / or the hand grinder.

[0017] Ergonomically, the measures described below are preferred, which also represent protection for the hands of an operator who, for example, guides the hand grinder. The measures described below also provide a high rigidity of the machine housing, so that, for example, in the case of a fall on the ground, no damage or only little damage has to be feared.

[0018] One preferred concept provides that a gripping opening is provided between the hand grip body and the connecting protrusion, through which the hand of an operator gripping the hand grip body can pass.

[0019] Advantageously, the hand grip body and the connecting projection have or form, transversely (left-right) to the longitudinal axis of the machine, an overall substantially V- or U-shaped shape, the hand grip body and the connecting projection forming, for example, lateral legs of a V- or U-shaped structure which, in their end regions remote from the machine housing and / or motor housing, are connected to one another directly in a V-shaped structure and by a bottom leg in a U-shaped structure.

[0020] The hand grip body and / or the connecting projection preferably have an elongated shape.

[0021] It is advantageous if the longitudinal axis of the handgrip body is oriented approximately parallel or at a small angle to the work surface.

[0022] The longitudinal axis of the connecting projection is preferably angled relative to the working surface, for example at an angle of up to 30° and / or at a larger angle relative to the working surface than the longitudinal axis of the hand grip body.

[0023] An advantageous concept provides that the handgrip body and the connecting projection have wall portions facing each other which extend transversely to the longitudinal machine axis or which extend parallel to the longitudinal machine axis and at an angle to the working plane, in particular at a right angle to the longitudinal machine central plane. It is also possible for the handgrip body and the connecting projection to have wall portions which have a lateral offset with respect to each other.

[0024] In this case, it is advantageous if the transverse width of the wall portion of the connecting projection has a value of at least 80%, preferably at least 90%, of the transverse width of the wall portion of the handgrip body in the area of ​​the machine housing, so that the connecting projection is relatively wide in the transverse direction to the longitudinal machine axis.

[0025] An embodiment may provide that the energy accumulator interface constitutes an integral component of the connecting protrusion or is at least partially integral with the connecting protrusion, however a modular concept is preferred.

[0026] An advantageous variant provides that the energy accumulator interface has an energy accumulator holder separate from the connection projection for holding the energy accumulator in a form-locking manner, the energy accumulator holder being received in a holder receiver arranged on the connection projection, the energy accumulator holder having, for example, connection means, such as form-locking contours, in particular longitudinal grooves, locking contours, etc., and / or electrical connection contacts for establishing an electrical connection between the energy accumulator and electrical components of the hand grinder arranged in the machine housing.

[0027] The energy store holder can be plugged, for example, into a holder receptacle, which is configured, for example, as a plug-in receptacle.

[0028] A preferred concept provides that the carrier receptacle is closed by a receptacle closure, which is removably connected or connectable to the connecting lug, in particular by screwing. The receptacle closure is preferably configured as a housing part. However, it can also be, for example, a screw, a plug element, etc.

[0029] It is advantageous if the receptacle closure is attached to the connecting projection in an attachment direction transverse to the longitudinal machine axis and / or if the support area of ​​the receptacle closure, which supports the receptacle closure on the connecting projection, has a greater longitudinal extension with a directional component parallel to the longitudinal machine axis than in a transverse direction, in particular at right angles to the longitudinal machine axis. The support area comprises, for example, wall sections or end faces facing each other at the wall of the receptacle closure. The receptacle closure is thus configured as a closure (lid) which extends substantially elongated along the longitudinal machine axis. This measure can advantageously contribute to an efficient support of the energy accumulator in the motor housing or machine housing.

[0030] The receiver closure and the connecting projection are configured, for example, as a housing part or housing shell.

[0031] The receiver closure is preferably held on the connecting projection by means of a plug-in profile.

[0032] These plug-in contours can contribute to the weight forces of the energy accumulator acting on the energy accumulator interface being optimally introduced into the machine housing.

[0033] A preferred concept provides that a plug-in device having at least one plug-in protrusion and at least one plug-in receiving portion for receiving said plug-in protrusion is arranged on the receiver closure and the connecting protrusion, and that the plug-in protrusion and the plug-in receiving portion engage with each other and / or are positioned and supported with respect to each other in the sense of positioning (centering) of the receiver closure on the connecting protrusion when the receiver closure is attached to the connecting protrusion.

[0034] The plug device preferably includes an in-line arrangement of a plurality of plug protrusions and plug receivers that are in engagement with one another when the receiver closure is attached to the connecting protrusion.

[0035] It is furthermore advantageous if at least one plug-in receptacle of the plug-in device is formed by spaced-apart wall sections, one of which faces the energy store carrier, in particular for supporting it, and the other wall section forms the outer wall of the connection projection, for example extending transversely to the machine longitudinal central plane. The plug-in receptacle is formed directly by the wall sections and is arranged in the hollow space between the wall sections.

[0036] An advantageous configuration provides that at least one plug-in receptacle of the plug-in device is formed by a step or a receiving groove in which the plug-in projection engages, with the step or the receiving groove as well as the plug-in projection being arranged on mutually engaging and / or mutually supporting end faces of the wall of the connecting projection and the wall of the receptacle closure.

[0037] For example, at adjacent or engaging end surfaces of a wall of the receiving closure body and a wall of the connecting projection, one of the walls has a step or groove into which the end surface of the other wall can engage.

[0038] Advantageously, the energy store interface is designed to support the energy store as optimally as possible. In the following, several advantageous measures are proposed for this purpose.

[0039] An advantageous concept provides that the energy accumulator interface, in particular the energy accumulator holder, has an elongated shape and extends along the connecting projection, in particular it is advantageous if the energy accumulator interface extends along the connecting projection and has an elongated shape in the direction of the longitudinal machine axis.

[0040] The energy store interface, in particular the energy store holder, preferably has a plug-in receptacle for plugging in the energy store or is configured as such a plug-in receptacle.

[0041] It is preferably provided that the energy store interface, in particular the energy store holder, has a form-locking contour extending along its longitudinal extent, in particular a longitudinal groove and / or a longitudinal protrusion. Advantageously, the energy store interface is further provided with locking means for locking the energy store. These locking means include, for example, one or more locking receptacles.

[0042] As already mentioned, the energy storage interface and the connection interface of the energy storage preferably include connection contacts, in particular plug-in contacts, for establishing an electrical connection between the energy storage and electrical components of the hand grinder.

[0043] A preferred concept provides that the energy accumulator interface, in particular the energy accumulator holder, has connection contacts for the energy accumulator arranged closer to the motor housing and connection contacts for the energy accumulator arranged further away from the motor housing, in particular in its longitudinal end region furthest from the motor housing, e.g. in one longitudinal end region data contacts are arranged and in the other longitudinal end region energy supply contacts.

[0044] The energy accumulator preferably extends only slightly or to a relatively small extent outside the connection projection or the handgrip body when the energy accumulator is fixed to the machine housing. Advantageously, it is considered that the energy accumulator does not extend beyond the longitudinal end of the connection projection and / or the handgrip body facing away from the motor housing when the energy accumulator is arranged at the energy accumulator interface, or extends beyond the longitudinal extension of the energy accumulator by at most 20%, in particular at most 10%, preferably at most 5%. The energy accumulator extends slightly or not at all outside the components of the machine housing, such as the hook body and / or the connection projection, toward the rear in the working direction.

[0045] With respect to the longitudinal machine axis, the connection projection can extend in a straight line, but can also have at least one step, several bends, etc. It is preferred if the wall section of the connection projection extending along the longitudinal machine axis has at least one step transversely to the longitudinal machine axis. This at least one step can be provided, for example, in the region of the passage opening, in particular at the passage opening, and / or in particular for widening the passage opening. However, it is also possible for a step to be provided on the connection projection on the side opposite the handgrip part or handgrip body. This at least one step contributes, for example, to widening the passage opening and / or to mechanically reinforce the connection projection. It is easily possible for a part of the at least one step to also be provided on the receiver closure, in particular configured as a housing part.

[0046] The measures described below advantageously contribute to optimal protection of the drive motor in the motor housing and / or to facilitating the mounting of the drive motor in or within the machine housing.

[0047] The motor housing preferably has a top wall, in particular integral with the circumferential wall, which closes the motor receiving space at the end, so that the motor housing and / or the motor receiving space are configured as a plug-in receptacle, for example, into which a drive motor can be plugged.

[0048] The upper wall advantageously forms the bottom of the motor receiving space.

[0049] The upper wall can advantageously have one or more passage openings, in particular for the connection of a drive motor, for example for cables or other such electrical components.

[0050] Opposite the upper wall there is advantageously arranged a mounting opening which can be closed by a lid which will be further described below.

[0051] A preferred concept provides that the motor receiving space is only accessible through the mounting opening for mounting the drive motor. Further components, such as an eccentric transmission and / or a fan wheel and / or a tool shaft, can also be arranged on the drive motor, which can also be introduced into the motor receiving space through the mounting opening. The drive train, in particular including the drive motor, can be introduced into the motor receiving space completely or as a whole, preferably including a tool receptacle for a disk tool, through the mounting opening. The drive train, for example, comprises, in addition to the drive motor, at least one further drive component, such as a transmission and / or a tool shaft and / or a fan wheel and / or a tool receptacle. The plug-in cross section of the mounting opening is preferably dimensioned in such a way that the maximum circumference of the drive motor, in particular the maximum circumference of the drive train including the drive motor, can be introduced into the motor receiving space through the mounting opening.

[0052] Advantageously, the plug-in cross section of the mounting opening is dimensioned such that the drive motor and the components connected to the drive motor and which can only be connected to or attached to the drive motor outside the motor receiving space can be inserted into the motor receiving space through the mounting opening. For example, an assembly direction or mounting direction can be provided such that the components connected to the drive motor can only be connected to the drive motor if the drive motor is arranged outside the motor receiving space. Also, the fastening means, for example screws, can make the drive motor or the components connected to the drive motor accessible for mounting only if the drive motor is arranged outside the motor receiving space.

[0053] The mounting opening is preferably arranged on the side of the machine housing on which the tool receiving portion is arranged.

[0054] However, it is also possible for the mounting opening to be arranged on the side of the machine housing facing the tool receptacle.

[0055] In this case, it can be considered that the motor receiving space preferably has a bottom, through which only the tool receiving part can pass, i.e. the peripheral wall which thereby defines the motor receiving space has a bottom wall through which the tool receiving part projects outside the motor receiving space and opposite which is provided an installation opening through which the drive motor can be introduced into the motor receiving space, in particular a drive train which includes the drive motor and which can include, for example, a fan wheel, an eccentric weight, etc., can be introduced into the motor receiving space. Advantageously, opposite the bottom wall is provided a lid, by means of which the installation opening can be closed. The lid can be arranged, for example, on the side of the machine housing opposite the tool receiving part. The lid can constitute a handgrip or a handgrip part.

[0056] The peripheral wall and / or top wall may be provided with reinforcing ribs or other such reinforcing profiles.

[0057] The motor receiving space can be configured as or can have or form a plug-in receptacle for plugging in the drive motor.

[0058] It is preferably considered that the motor receiving space is closed or can be closed by a lid that can be removably connected to the motor housing. Thus, for example, the drive motor can be inserted into the motor receiving space that is closed by the lid. The lid can tightly close the motor receiving space. The lid can be provided and configured for fixing the drive motor in the motor receiving space.

[0059] A lid is provided specifically for closing the motor receiving space, which can be different from the cover or the suction hood for the disk tool, but is preferably formed by the cover and / or the suction hood for the disk tool.

[0060] The cover is fixed, for example, by screws to a housing base of a machine housing in which a motor receiving space is provided.

[0061] For example, the following configuration of the hand grinder can contribute to supporting the lid portion.

[0062] Advantageously, on the circumferential wall of the motor housing facing away from the motor receiving space, there is a support wall which is in particular collar-like and / or flange-like and / or integral with the circumferential wall and projects outwards.

[0063] This support wall advantageously contributes, inter alia, to the reinforcement of the motor housing.

[0064] This support wall can also be used to support the hand grip body or the connecting projection.

[0065] It is preferably considered that the connection protrusion, in particular the part of the connection protrusion facing the hand grip body and / or the part spaced apart from the hand grip body and / or the part spaced apart from the hand grip body, is supported on and / or is integral with the supporting wall.

[0066] The machine housing is preferably multi-piece and / or has multiple housing components, such as a housing base and / or a housing lid.

[0067] A preferred concept provides that the machine housing has a housing base body which integrally includes the motor housing and the connection projection, preferably also the handgrip body, and wherein the housing base body is closed or can be closed by a housing lid, which can form, for example, a top part of the machine housing which is opposite the disk tool.

[0068] It is preferably provided that the housing lid extends over the entire longitudinal machine axis of the machine housing, in particular of the housing base body, or substantially over the entire longitudinal machine axis.

[0069] The housing lid advantageously forms a component of the handgrip part, in particular of the handgrip body.

[0070] For example, the housing lid is disposed on the housing base on the opposite side to the connecting protrusion.

[0071] It is advantageous if the housing lid and the connecting projection are arranged on opposite sides of the hand grip body and / or if the connecting projection is arranged closer to the disc tool than the housing lid.

[0072] An advantageous concept provides that the housing lid covers the motor housing, in particular completely, on the side of the machine housing facing away from the disk tool. The housing lid can form the aforementioned end-side top wall of the motor housing. However, it is also possible for the housing lid to be a separate component from this top wall.

[0073] It is advantageously provided that the housing cover closes a receiving space for, for example, a control device of the hand grinder, in particular a control module of the hand grinder, but it is also possible that electrical cables or other such electrical components are arranged in the receiving space, for example for the electrical current supply of the drive motor, i.e. the control module does not necessarily have to be arranged in the receiving space.

[0074] The housing lid is preferably positioned opposite the upper wall which closes the motor receiving space, between which, for example, the above-mentioned receiving space is formed, so that in this embodiment, a further lid, i.e. the housing lid, is positioned opposite the upper wall which already closes the motor receiving space anyway.

[0075] The receiving space preferably has at least one connection path for receiving electrical wiring, which connects or allows the control device or control module and / or the drive motor to the energy storage interface. The receiving space is also suitable for laying or receiving electrical wiring.

[0076] A preferred concept provides that at least one switch element, preferably all switch elements for switching the control-operable and / or electrical functions of the hand grinder are arranged in the receiving space. It is also possible for the at least one switch element to be arranged on a printed circuit board or a control module of the control device. If the control module is mounted in the receiving space, then the switch element is simultaneously arranged in the receiving space.

[0077] The housing lid and / or the housing base preferably have at least one passage opening for at least one switch element or for at least one actuating body for operating the switch element, whereby the switch element which is completely or partially arranged in the receiving space can be operated from outside the machine housing.

[0078] The multi-part construction type of the machine housing makes it particularly easy to use different materials or material combinations.

[0079] One advantageous concept provides that the housing base part consists of a harder material than the housing lid, for example a different plastic is used.

[0080] It is furthermore advantageous if the housing lid has at least one elastic or soft or damping component on its outer surface facing away from the housing base, in particular if the housing base does not have such a damping or soft component, but only the housing lid.

[0081] It can furthermore advantageously be provided that the housing basic body consists of less material than the housing lid, in particular that the housing basic body consists of only one material, for example a hard plastic material.

[0082] The housing lid and the receptacle closure preferably have no direct contact with each other: the housing lid and the receptacle closure are arranged on the housing base, but are not in direct contact with each other, but are connected to each other via the housing base, for example. This measure contributes to the stiffness of the machine housing and / or reduces the influence of manufacturing tolerances.

[0083] A hand grinder of the type mentioned at the beginning, in particular according to the preamble of claim 1 or according to the above-mentioned features, advantageously has a dust discharge connection for discharging and guiding dust generated when machining a workpiece with a disk tool.

[0084] It is furthermore advantageous if the hand grinder has an energy accumulator interface for removably connecting an electrical energy accumulator for electrical energy supply of the hand grinder, in particular electrical energy supply of the drive motor, by means of the energy accumulator connection interface, in which the electrical energy accumulator has an energy accumulator housing extending along an energy accumulator longitudinal central plane, in which the machine housing has a machine longitudinal central plane extending transversely, in particular perpendicularly, to the working surface, in which the hand grinder has a handgrip portion in which it can be held by the operator and can be guided forward along the workpiece in a working direction parallel to the machine longitudinal central plane.

[0085] In a hand grinder with an energy accumulator interface and a dust exhaust connection, it is advantageous if the energy accumulator interface of the hand grinder is arranged in relation to the machine longitudinal central plane and / or the connection interface of the energy accumulator is arranged in relation to the energy accumulator longitudinal central plane such that, when the energy accumulator is held at the energy accumulator interface, the energy accumulator longitudinal central plane has a lateral distance (left-right distance) to the machine longitudinal central plane.

[0086] The connection interface of the energy accumulator is arranged asymmetrically with respect to the longitudinal central plane of the energy accumulator, and the energy accumulator interface of the hand grinder can have a transverse distance or a lateral offset with respect to the longitudinal central plane of the machine. However, it is also possible for the hand grinder to have an energy accumulator interface arranged symmetrically with respect to its longitudinal central plane of the machine, and for the connection interface of the energy accumulator to be arranged asymmetrically with respect to the longitudinal central plane of the energy accumulator and / or have a transverse distance with respect to the longitudinal central plane of the energy accumulator, so that when the energy accumulator is attached to the machine housing or to the energy accumulator interface of the hand grinder, the longitudinal central plane of the energy accumulator is not aligned with the longitudinal central plane of the machine, but has a transverse distance with respect to the longitudinal central plane of the machine. Both of the above measures can also be considered in combination, for example, if the energy accumulator should have as large a transverse distance as possible with respect to the longitudinal central plane of the machine.

[0087] A basic idea is that the energy accumulator is not arranged in line with the machine housing in the working direction, as in the hand grinder described, for example, in the hand grinder described in DE 10 2018 103 767 A1, which discloses a typical hand grinder, i.e. the longitudinal central planes of the machine housing and the energy accumulator are not aligned with each other, but rather arranged with a lateral offset transverse to the working direction and / or transverse to the longitudinal central plane of the machine, in an asymmetrical arrangement. Thus, for example, space is provided laterally to the side of the energy accumulator for the hand grip of the hand grinder, for example for a dust exhaust connection or other such components, with respect to the working direction in which the hand grinder can be guided forward along the workpiece.

[0088] The embodiment of the hand grinder described below relates to a preferred embodiment of the above-mentioned hand-held tool machine, but is also an original invention in connection with the configuration described at the beginning or the configuration of the preamble of claim 1.

[0089] In this hand grinder according to the preamble of claim 1 or according to the above description, it is taken into account that the underside of the dust discharge connection facing the working surface has a dust discharge connection spacing with respect to a plane containing the working surface, which dust discharge connection spacing is greater than the minimum energy accumulator spacing with respect to said plane of the underside of the energy accumulator attached to the energy accumulator interface facing the working surface.

[0090] The energy accumulator preferably constitutes an integral part of the hand grinder and is removably securable thereto.

[0091] The energy accumulator preferably has at most five, in particular at most four, more preferably at most three, even more preferably at most two or even only one accumulator cell in the direction perpendicular to the plane in which the processing surface is arranged. For example, the energy accumulator only has accumulator cells arranged side by side in only one layer. However, it is also possible for the energy accumulator to have several layers, for example two or three layers, of accumulator cells arranged one above the other. In this case, the accumulator cells of the accumulator cell layers arranged one above the other can have a lateral offset, so that the accumulator cells of one accumulator cell layer engage between the accumulator cells of the other accumulator cell layer. Thus, the energy accumulator housing has a flat shape or is flat, but the minimum distance of the energy accumulator housing to the plane in which the processing surface extends can be smaller than the minimum distance of the dust discharge connection.

[0092] The processing surface is preferably a flat surface, i.e. the dust discharge connection interval and the energy storage unit interval are, for example, perpendicular to the plane in which the processing surface extends. However, it is also possible for the processing surface to have a curved or arcuate shape, but to extend substantially in the plane in which the energy storage unit interval and the dust discharge connection interval are associated.

[0093] In this case, a basic idea is that the energy accumulator is arranged closer to the disk tool, i.e. closer to the workpiece to be processed, and the dust discharge connection has a larger distance from the processing surface and therefore from the workpiece. An advantage results from the fact that the energy accumulator, which is actually relatively heavy, results in a favorable position of the center of gravity of the hand grinder, close to the processing surface and therefore preferably close to the workpiece that can be processed with the hand grinder. A further or alternative advantage is that, for example, the suction hose, the dust collecting container, etc., have a relatively large distance from the processing surface and therefore also from the workpiece that can be processed preferably with the hand grinder. This means that, for example, a large-volume dust collecting container can be attached to the dust discharge connection. The guidance of the suction hose, which can be connected to the dust discharge connection, is also improved in the arrangement of the hand grinder with the above-mentioned distance of the dust discharge connection and the energy accumulator part from the processing surface.

[0094] It is preferred if the center of gravity of the energy accumulator is arranged close to the working surface and / or in the rear end region of the disk tool in the working direction and / or close to the outer periphery of the disk tool.

[0095] The dust discharge connection spacing and the energy accumulator spacing are the spacing of the dust discharge connections and the spacing of the energy accumulators perpendicular to the plane in which the working surface extends. With respect to this plane or working surface, or with respect to the workpiece if a hand grinder is used, the dust discharge connections have a greater spacing than the energy accumulators. In other words, the dust discharge connections are located further above the surface of the workpiece that can be worked with the hand grinder than the energy accumulators.

[0096] The inside width between, on the one hand, the plane in which the working surface extends or, if, for example, a disc tool does not have a completely flat working surface, the plane in which the working surface is at least substantially arranged, and, on the other hand, the dust exhaust connection, is greater than the inside width between that plane and the energy accumulator.

[0097] It is noted here that the longitudinal axis of the dust discharge connection, along which the dust discharge connection extends, and / or the longitudinal axis of the energy store, if the latter is attached to the machine housing, may be parallel to the processing surface or inclined at a small angle of less than 5°. However, it is also possible that one of the longitudinal axes, i.e. the longitudinal axis of the dust discharge connection and / or the longitudinal axis of the energy store, may have an inclination to the processing surface, for example an inclination of 10° to 30°. It is thus clear here that the dust discharge connection and / or the energy store may have an inclination to the processing surface, with one longitudinal end region of the dust discharge connection or the energy store being closer to the processing surface and the other longitudinal end region being further away from the processing surface. In this case, the region of the dust discharge connection closer to the processing surface has the smallest dust discharge connection spacing, and the region of the energy store closer to the processing surface has the smallest energy store spacing. The minimum dust exhaust connection spacing is greater than the minimum energy store spacing.

[0098] An advantageous concept provides that the energy accumulator interface is arranged asymmetrically with respect to the machine longitudinal central plane and / or laterally transversely to the machine longitudinal central plane over the entirety or at least 80% of its longitudinal extent transversely to the machine longitudinal central plane. In particular, the energy accumulator interface is arranged laterally offset only towards one side transversely to the machine longitudinal central plane and does not extend towards the side opposite this side or extends only to a small extent of at most 20% of its longitudinal extent transversely to the machine longitudinal central plane. The energy accumulator interface is thus arranged completely or almost completely laterally transversely to the machine longitudinal central plane, so that on mutually opposite sides of the machine longitudinal central plane, an energy accumulator is arranged on the one hand and other components of the hand grinder, such as a dust discharge connection or a suction hose or a dust collection container arranged at the dust discharge connection, are arranged on the other hand.

[0099] A preferred variant provides that the energy store interface has a first and at least one second energy store interface connection for a first and at least one second energy store. These energy store interface connections may be of the same structure, but may also be different. The energy stores that can be attached to the energy store interface connections may be of the same type, i.e. have, for example, geometrically identical energy store housings and / or have the same electrical characteristics. However, it is also possible for the energy stores to have different electrical characteristics, for example different voltages and / or different electrical energy store capacities.

[0100] It is advantageously provided that at least one energy accumulator, and preferably further energy accumulators, for example two or three, can be arranged on the energy accumulator interface arranged asymmetrically with respect to the machine longitudinal central plane. The energy accumulator interface can be configured so that a plurality of, for example two, energy accumulators can be fastened and / or arranged on the energy accumulator interface side by side transversely to the machine longitudinal central plane and / or a plurality of, for example also two, energy accumulators can be fastened and / or arranged on the energy accumulator interface side by side with respect to an axis extending parallel to the machine longitudinal central plane or with respect to an axis extending at an angle of less than 45° to the machine longitudinal central plane.

[0101] The connection interfaces of the energy accumulator can be arranged asymmetrically with respect to the energy accumulator housing as already mentioned, i.e. one embodiment provides, for example, that the connection interfaces of the energy accumulator, which are provided for connection to the energy accumulator interface of the hand grinder, have different distances to the longitudinal side faces of the energy accumulator housing between which the longitudinal central face of the energy accumulator extends.

[0102] In a hand grinder, an advantageous arrangement provides that the longitudinal sides or longitudinal side walls of the energy accumulator housing of the energy accumulator, in the case where the energy accumulator is mounted on the machine housing, run parallel to the machine longitudinal central plane or run at a small angle of less than 40°, preferably less than 35°, in particular less than 30°, particularly preferably less than 20°, to the machine longitudinal central plane. The longitudinal sides or longitudinal side walls can run parallel to one another. However, they can also be at an angle to one another, so that the energy accumulator housing has, for example, a trapezoidal shape. It is particularly advantageous if the longitudinal sides or longitudinal side walls converge (taper) in the direction of the connection interface and / or towards the machine housing.

[0103] It is advantageous if the longitudinal lateral sides or longitudinal side walls of the energy accumulator housing have different distances to the longitudinal central machine plane.

[0104] It is advantageously provided that the energy storage interface constitutes the only energy storage interface of the hand grinder, i.e. no further energy storage interfaces are provided.

[0105] Advantageously, only one energy store can be arranged on the energy store interface. Preferably, the energy store interface is configured for the attachment of only one energy store, i.e. in this embodiment, further energy stores, e.g. for increasing the supply voltage and / or the supply current, cannot be removably arranged on the energy store interface.

[0106] Furthermore, it is expedient if the hand grinder can only be supplied with electrical energy by one energy accumulator, i.e. in this configuration no further energy accumulators can be connected to the hand tool machine.

[0107] It is certainly possible for the energy accumulator interface to be arranged in the handgrip part of the hand grinder or in the free end region of the machine housing of the hand grinder.

[0108] However, a preferred embodiment provides that the energy accumulator interface of the hand grinder is arranged between the tool receptacle or, if appropriate, the disk tool fixed or held on the tool receptacle and the longitudinal end region of the handgrip part facing away from the tool receptacle or the disk tool. In this embodiment too, it is possible for the energy accumulator held on the energy accumulator interface to extend beyond the free end region of the machine housing or the free end region of the handgrip part. However, it is also possible in this embodiment for the energy accumulator held on the energy accumulator interface not to extend beyond the free end region of the handgrip part or the free end region of the machine housing facing away from the tool receptacle.

[0109] The energy accumulator fixed to the energy accumulator interface advantageously extends outside the longitudinal end region of the handgrip part or the machine housing by up to 50%, in particular by up to 30%, more preferably by up to 20%, of its longitudinal length extending parallel to the distance area between the tool receiving part and the longitudinal end region of the handgrip part or the machine housing opposite the tool receiving part.

[0110] The energy accumulator held or fixed to the energy accumulator interface is advantageously arranged in such a way that it has a partial area between the tool receptacle and the free end area of ​​the machine housing or the free end area of ​​the handgrip part, preferably such that when the energy accumulator is fixed to the energy accumulator interface, at least half, preferably at least two thirds and even more preferably at least 75% or 80% or 85% of the length of the energy accumulator housing is arranged between the end area of ​​the handgrip part or the machine housing facing away from the tool receptacle and the tool receptacle.

[0111] In one variation of the invention, the energy accumulator interface can be arranged on the top surface of the hand grinder or on the side of the hand grinder opposite the tool receiving portion.

[0112] Furthermore, the energy accumulator interface can be arranged on a surface portion, e.g., a vertical surface portion, extending between the lower surface portion or the side having the tool receiving portion and the side opposite the upper surface portion or the side having the tool receiving portion.

[0113] However, an arrangement of the energy accumulator interface on the underside or on the side of the machine housing or the handgrip part or both that faces the working surface when the hand grinder is in use is preferred. One preferred concept provides that the energy accumulator interface is arranged on the machine housing, in particular on the handgrip part of the machine housing, on the side that faces the working surface. It is also advantageous if the energy accumulator interface is arranged on the side of the machine housing that has the tool receptacle, in particular in the region of the handgrip part.

[0114] The energy accumulator housing advantageously has a front part or front wall facing the machine housing and a rear part or rear wall facing away from the machine housing, each of which extends transversely, in particular perpendicularly, to the machine longitudinal central plane, and which further preferably extend parallel to one another.

[0115] Furthermore, the energy accumulator housing has a top or upper wall and a bottom or lower wall on opposite sides or opposite to each other, which can run parallel to each other or can also have an angle with respect to each other, for example an angle of up to 15°. Advantageously, the top or upper wall is provided with a connection interface for the energy accumulator interface of the machine housing.

[0116] The dust discharge connection and the energy accumulator can be arranged on opposite sides of the machine longitudinal midplane or along a plane of the machine housing parallel to the machine longitudinal midplane. One configuration can provide that the energy accumulator longitudinal midplane and the midplane of the dust discharge connection, which is perpendicular to the working surface or a plane containing the working surface and parallel to the machine longitudinal midplane, are arranged on opposite sides of the machine longitudinal midplane. The dust discharge connection and the energy accumulator can be arranged on opposite sides of the machine longitudinal midplane with respect to their transverse width substantially transverse to the machine longitudinal midplane, but it is also possible that the dust discharge connection and / or the energy accumulator are passed by the machine longitudinal midplane.

[0117] Advantageously, the energy accumulator spacing in the longitudinal end region of the energy accumulator facing the machine housing of the hand grinder is smaller than the energy accumulator spacing in the longitudinal end region facing away from the machine housing, i.e. it is possible for the underside or the underside wall, for example, to have an inclination with respect to the working surface, which preferably has a value of at most 30°, in particular at most 20° or at most 15°.

[0118] The configuration of the hand grinder described below, in conjunction with the configuration of the preamble of claim 1, also represents an independent invention in itself, and provides that the energy accumulator and / or the dust discharge connection do not extend outside the outer contour of the disk tool in the transverse direction to the machine longitudinal central plane, or extend outside the outer contour of the disk tool by at most 20%, in particular at most 15%, in each case, preferably at most 10%, of the transverse width extending transversely to the machine longitudinal central plane. The energy accumulator or its energy accumulator housing and / or the dust discharge connection are arranged in a corridor section (passage section) that runs parallel to the machine longitudinal central plane and whose lateral boundaries are determined by the maximum transverse spacing of the disk tool to the machine longitudinal central plane. This disk tool preferably relates to the narrowest disk tool in relation to the machine longitudinal central plane that can be removably fixed to the hand grinder.

[0119] In principle, it is now possible for the dust discharge connection to extend outside the machine housing or outside the cover for the disk tool in the direction of the disk tool, in particular towards the rear in the working direction. Preferably, however, the dust discharge connection is arranged as close as possible to the longitudinal central plane of the machine. Advantageously, it can be considered, for example, that the dust discharge connection does not extend outside the outer area contour of the machine housing or outside the outer area contour of the cover for the disk tool, in particular the suction hood, arranged on the machine housing, in the transverse direction to the longitudinal central plane. The disk tool extends outside the said cover, for example, in the transverse direction to the longitudinal central plane of the machine.

[0120] It is advantageously provided for the disk tool to be arranged in a suction space which is in flow connection with the dust discharge passage, the suction space being arranged in, for example, a suction hood or formed by, the suction hood.

[0121] An advantageous configuration provides that the dust exhaust connection is arranged on a suction hood which at least partially covers the disk tool.

[0122] However, it is also possible for the suction space in which the disk tool is arranged to communicate with a dust exhaust passage running through the machine housing.

[0123] Advantageously, the dust discharge passage communicating with the dust discharge connection runs through the machine housing, in which embodiment, for example, dust occurring on the work surface can flow from the suction space through the machine housing to the dust discharge connection.

[0124] For example, a dust exhaust passage running through the machine housing makes it possible to easily realize the following configurations:

[0125] It is advantageously considered that in the hand grinder, the upper surface of the dust exhaust connection facing away from the working surface is arranged completely or partially above the upper surface of the energy accumulator arranged at the energy accumulator interface facing away from the working surface.

[0126] A preferred configuration of the hand grinder provides that the hand grinder has a dust discharge channel which communicates with the suction space in which the disk tool is arranged and with the dust discharge connection and / or establishes a flow connection between the dust discharge connection and the suction space. The dust discharge channel is, for example, arranged in or within the machine housing or runs through the machine housing.

[0127] Advantageously, it is provided that the dust discharge path extends past the energy store interface.

[0128] It is advantageous if the dust discharge connection has or is constituted by a connection piece for connecting a suction hose or a dust collecting container. It is also possible for a retention contour, such as a form-locking contour, in particular a bayonet contour, a locking contour, etc., to be arranged on the dust discharge connection for fixing the suction hose or the dust collecting container in place.

[0129] The dust collection container can be a component of the hand grinder. Advantageously, the dust collection container is arranged in the corridor, the outer surface of which (both outer surfaces) are defined by the transverse width of the disk tool transverse to the machine longitudinal center plane. The dust collection container is preferably removably fixable to the dust discharge connection.

[0130] Advantageously, it is considered that the dust discharge connection defines a flow path extending along a longitudinal extension axis parallel to the machine longitudinal central plane or along a longitudinal extension axis having an angle of at most 30°, in particular at most 20°, particularly preferably at most 15° or at most 10° to the machine longitudinal central plane. If the longitudinal extension axis of the dust discharge connection extends parallel to the machine longitudinal central plane or only obliquely at a small angle, for example, the dust discharge connection, in particular the suction hose connected to the connection piece, can be arranged closely spaced to the machine longitudinal central plane or can extend close to the machine longitudinal central plane. Thus, for example, the suction hose is arranged in a corridor in its end region connected to the hand grinder, and the outer surface (both outer surfaces) of the corridor is defined by the transverse width of the disk tool transverse to the machine longitudinal central plane.

[0131] Advantageously, it is provided that the handgrip portions are passed by the longitudinal machine plane and / or that the handgrip portions extend outside the longitudinal machine plane on opposite sides.

[0132] The handgrip portion, and in particular the hand grip of the handgrip portion, is preferably symmetrical with respect to the machine-direction mid-plane.

[0133] Advantageously, the handgrip portion extends parallel to the machine center plane.

[0134] The disk tool preferably has a plate-shaped base body, on which the grinding means is fixedly or removably arranged. For example, the working surface is provided with an adhesive means, for example a removable layer (Velcro layer), for removably fixing the grinding sheet. However, the base body of the disk tool can also have integral structures on the working surface that are suitable for grinding or polishing the workpiece. The disk tool can be, for example, a circular disk tool, but also a polygonal disk tool, in particular a rectangular or triangular disk tool.

[0135] A preferred concept provides that alternatively different disc tools can be fastened to the hand grinder, the disc tools having a fastening interface, preferably at the machine side, such as a screw-in contour, a plug-in opening, etc., for fastening to a tool receiving part of the hand grinder, with the machine side and the working surface being arranged on opposite sides of the disc tool.

[0136] Preferably, the disc tool is provided with a flow passage for the flow of dust-laden air, the flow passage having an inlet opening at the working surface and an outlet opening at the machine side part of the disc tool opposite the working surface.

[0137] A symmetrical configuration and / or arrangement of the drive train of the hand grinder with respect to the machine longitudinal center plane is geometrically favorable.

[0138] Advantageously, it is envisaged that the machine longitudinal central plane extends parallel to a tool axis of a tool shaft which is driven or can be driven by the drive motor, on which a disk tool is arranged or can be arranged for driving by the drive motor.

[0139] Furthermore, it is advantageous if the driven part of the drive motor or the driven shaft of the drive motor is arranged in the longitudinal central plane of the machine.

[0140] Furthermore, it is preferred if the drive and / or driven part of the transmission arranged between the tool receiving part and the drive motor extends in the longitudinal central plane of the machine.

[0141] An advantageous concept provides that the disk tool can be rotationally and / or oscillatingly driven about the tool axis by a drive motor, in particular by means of a gearing, and / or can be driven by means of a hypercycloidal rotational movement.

[0142] The tool receiving part of the hand grinder to which the disc tool is fixed or removably fixable is preferably rotatable about the tool axis.

[0143] It is also possible that a transmission is arranged between the drive motor and the tool receiving part, by means of which the tool receiving part can be driven by the drive motor for a hypercycloidal movement and / or an eccentric movement and / or a rubbing or vibratory movement.

[0144] The tool axis preferably extends transversely, in particular perpendicularly, to the work surface.

[0145] The energy accumulator comprises an accumulator cell, for example a battery cell, which is capable of providing electrical energy and is rechargeable.

[0146] The energy accumulator housing preferably has a cubic shape, and the accumulator cells are arranged in the energy accumulator housing.

[0147] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Brief description of the drawings]

[0148] [Figure 1] FIG. 1 is a perspective view of a hand grinder equipped with a dust collection container and a circular disk tool, viewed obliquely from above. [Diagram 2]FIG. 2 shows the hand grinder according to FIG. 1 without the dust container. [Diagram 3] 3 is a view of the hand grinder shown in FIGS. 1 and 2 as seen obliquely from below and behind. FIG. [Figure 4] FIG. 2 is a top view of the hand grinder according to the previous figures. [Diagram 5] FIG. 5 shows a side view of the hand grinder according to FIGS. 1 to 4 with a first energy accumulator; [Figure 6] FIG. 6 shows the hand grinder according to FIG. 5 in a side view with a smaller second energy accumulator. [Figure 7] 7 shows the hand grinder according to FIGS. 5 and 6 in a side view from the opposite side to the drawings of FIGS. 5 and 6. FIG. [Figure 8] FIG. 2 shows a top view of the hand grinder according to the previous figures, with a first dust collecting container. [Figure 9] FIG. 9 is a rear view of the hand grinder from FIG. 8. [Figure 10] FIG. 9 is a view from above, generally corresponding to FIG. 8, of a variant of the hand grinder according to the previous figures, with a polygonal disk tool and a second dust collecting container. [Figure 11] FIG. 11 is a rear view of the hand grinder from FIG. 10. [Figure 12] FIG. 10 is a top view of the hand grinder of FIGS. 4 and 9 with a circular disk tool and with a suction hose attached. [Figure 13] FIG. 13 shows a variant of the hand grinder according to FIG. 12, with a dust exhaust connection oriented obliquely with respect to the longitudinal machine axis of the hand grinder, viewed from above. [Figure 14] FIG. 14 shows another variant of the hand grinder according to FIGS. 12 and 13, with a dust exhaust connection at a larger angle than in the hand grinder according to FIG. 13. [Figure 15]FIG. 2 shows a bottom view of the hand grinder according to the previous figures, as well as an energy accumulator interface for attachment to the hand grinder. [Figure 16] FIG. 2 is an exploded view of the hand grinder according to the previous figures, seen obliquely from above. [Figure 17] FIG. 17 is an exploded view corresponding to FIG. 16, seen from diagonally below. [Figure 18] FIG. 2 shows the hand grinder according to the previous figures in a partially assembled state, viewed obliquely from above and from the front. [Figure 19] 19 is a rear bottom view of the partially assembled hand grinder of FIG. 18. FIG. [Figure 20] FIG. 13 shows another hand grinder with an energy storage interface below the dust exhaust connection, as viewed obliquely from the rear above. [Figure 21] FIG. 21 shows the hand grinder according to FIG. 20 with a dust collection container. [Figure 22] 22 is a view of the hand grinder from FIG. 21 as seen obliquely from above and in the front. [Diagram 23] FIG. 23 shows a variation of the hand grinder of FIGS. 20 to 22 with the dust exhaust connection located in a different location. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0149] In the hand grinders 10A, 10B, 10C, and 10D described below, the same or similar components are designated by the same reference numerals. When the respective descriptions relate to all the hand grinders 10A, 10B, 10C, and 10D, they are also generally referred to as the hand grinder 10.

[0150] The hand grinder 10 has a drive motor 11 which drives, directly or optionally via a transmission 12, as generally indicated, a tool shaft 13 having a tool receptacle 14. A disk tool 40 for machining a workpiece WST, for example a circular disk tool 40A or a polygonal, in particular an approximately triangular disk tool 40B, can be removably fastened to the tool receptacle 14, whereby the disk tool 40 could also be fixedly connected to the tool receptacle 14.

[0151] To control the drive motor 11, a control device 15 is used, which is configured, for example, as a control module 16. The control module 16 includes, for example, a printed circuit board 16A. To switch the drive motor 11 on and off, a switch element 17 is used which can be operated by an operator. By means of a further speed switch element 18, for example, the speed of the drive motor 11 can be set by the operator. Also, by means of a switch element 19, for example, an electrical function of the hand grinder 10 can be set.

[0152] The support element 20 is arranged in a suction hood 23. For example, the support element 20 has a ring-shaped support 21. The support element 20 is arranged between the machine housing 50 of the hand grinder 10 and the suction hood 23. The suction hood 23 constitutes a cover for the disk tool 40.

[0153] A bearing body 25 for rotatably supporting the tool shaft 13 is disposed in the internal space of the suction hood 23 which defines the suction space 24 .

[0154] A tool receptacle 14 is arranged on the tool shaft 13. In the fully assembled state of the hand grinder 10, the tool shaft 13 is rotatably connected to the driven part of the drive motor 11 or to the driven part of a transmission 12 which is driven by the drive motor 11.

[0155] The transmission 12 is arranged between the drive motor 11 and the tool receptacle 14 and can be provided, for example, on a bearing assembly 25. For example, the transmission 12 can be formed by or can include an eccentric bearing. It is also possible that the bearing assembly 25 simply rotatably supports the tool shaft 13, i.e. no transmission 12 is provided.

[0156] The tool receiving portion 14 projects into and / or is arranged in a preferably hood-shaped interior space 26 of the bearing body 25 .

[0157] A disk tool 40, for example a grinding or polishing tool, can be removably fixed in the tool receiving part 14. The disk tool 40 is, for example, a circular disk tool 40A or a polygonal, in particular triangular, disk tool 40B.

[0158] For example, the tool receptacle 14 and the fixing interface 41 of the disk tool 40 can be provided with bayonet connection means which can be brought into engagement with one another. In the present embodiment, however, a screw connection is provided in particular by means of the fixing element 14A. The fixing element 14A comprises, for example, a screw which can be inserted through a through-opening in the fixing interface 41 and which can be screwed into a screw-receptacle of the tool receptacle 14A. Furthermore, the fixing interface 41 and the tool receptacle 14 have a rotational coupling contour for a rotational coupling of the disk tool 40 by the tool receptacle 14.

[0159] The hand grinder 10 has a dust discharge connection 30 for discharging the dust-laden air P from the suction space 24. The dust discharge connection 30 is in flow connection with the suction space 24.

[0160] The dust exhaust connection 30 is arranged, for example, on the suction hood 23 .

[0161] The dust discharge connection 30 has, for example, a connection piece 31 which is arranged on the outer surface of the suction hood 23 and is suitable for connecting the suction hose 200 or the dust container 300 or 400. The dust container 300 or 400 can be selectively arranged on the hand grinders 10A, 10B, 10C, 10D.

[0162] The disk tool 40 is mounted in the tool receiving portion 14 and is received substantially within the suction space 24 .

[0163] An annular sealing element 28 is arranged on the outer periphery 27 of the suction hood 23. The sealing element 28 rests, for example, against the outer periphery 42 of the disk tool 40 or faces the outer periphery 42 of the disk tool 40, so that a machine side part 43 of the disk tool 40 is received in a substantially sealing manner in the suction space 24.

[0164] The disk tool 40 has a machine side 43 and a working surface 44 on the opposite side for working the workpiece WST. The working surface 44 can include, for example, an attachment for fastening an abrasive sheet or other abrasive material. The working surface 44 can also directly include an abrasive or polishing material that is fixedly connected to or constituted by the base of the disk tool 40.

[0165] The working surface 44 extends in a plane E44, which extends, for example, along a planar surface of the workpiece WST.

[0166] A plurality of flow openings 45 extend between the machining surface 44 and the machine side portion 43, and dust-laden air P can flow from the machining surface 44 to the machine side portion 43 through these flow openings 45. At this time, the air P flows in through the inlet openings of the flow openings 45 arranged on the machining surface 44, and flows out from the flow openings 45 toward the suction space 24.

[0167] The machine housing 50 has a drive portion 51 and a handgrip portion 60 .

[0168] The drive portion 51 includes a motor housing 52 for receiving the drive motor 11. The motor housing 52 includes a substantially cylindrical peripheral wall portion 53 and an upper wall portion 54, and the peripheral wall portion 53 and the upper wall portion 54 as a whole define a motor receiving space 55 for receiving the drive motor 11.

[0169] The motor receiving space 55 is configured in the form of a receiving cylinder or receiving pot, whereby the drive motor 11 received in the motor receiving space 55 is supported by its outer periphery or on its peripheral side on the peripheral wall 53 and by its end side or on the end side opposite the tool receiving space 14 on the upper wall 54.

[0170] The motor receiving space 55 is closed on the opposite sides by the upper wall 54 on the one hand and, in the assembled state of the hand grinder 10, by a lid 56 on the other hand, which is formed by the suction hood 23 or by the hood body of the suction hood 23.

[0171] The lid 56 serves to close the mounting opening 55E, which allows access to the motor receiving space 55. For example, the drive motor 11 can be inserted into the motor receiving space 55 through the mounting opening 55E. The lid 56 closes the mounting opening 55E. It should be noted here that the mounting opening 55E advantageously allows the entire drive train, including the drive motor 11 and other drive components, such as the transmission 12 and / or the tool shaft 13 and / or the bearing body 25, to be inserted or be insertable into the motor receiving space 55 through the mounting opening 55E. The mounting opening 55E is then closed with the lid 56. The mounting of the drive motor 11 and the components connected to it in the motor receiving space 55 is thus carried out in a very simple manner.

[0172] The lid part 56 advantageously holds the drive motor 11 in the motor receiving space 55. The drive motor 11 is, for example, held in a sandwich-like manner between the upper wall part 54 and the lid part 56 when the drive motor 11 is arranged in the motor receiving space 55.

[0173] The support element 20 is held in a sandwich-like manner between the suction hood 23 and the machine housing 50. For example, the support element 20 is supported on a support wall 57 of the machine housing 50.

[0174] The support wall 57 extends, for example, around an insertion opening of the motor receiving space 55 , through which the drive motor 11 can be inserted into the motor receiving space 55 .

[0175] The support wall 57 projects, for example, radially outwardly with respect to a rotation axis D of the drive motor 11, which for example forms a tool axis WA, around which the tool shaft 13 and thus the disk tool 40 are driven in rotation. However, it is also possible for the tool axis WA and the rotation axis D to be at an angle to one another or parallel, for example if a transmission 12 is provided which is adapted to convert a rotational movement of the drive motor 11 into an oscillating drive movement of the tool receptacle 14 or of the tool shaft 13.

[0176] The support wall 57, for example in the form of a collar or flange, projects radially outwards relative to the tool axis WA outside the motor housing 52.

[0177] Fins 57A may be arranged on the support wall 57, which define air channels for cooling air, for example for cooling the drive motor 11.

[0178] Furthermore, the support wall 57 preferably has screw receiving portions 57B for the screws 23A, by means of which a lid 56 closing the motor receiving space 55, for example the suction hood 23, can be screwed to the machine housing 50.

[0179] The peripheral wall 53 of the motor housing 52 may advantageously be completely or partially surrounded by an outer circumferential wall 58 .

[0180] For example, between the peripheral wall 53 and the peripheral wall 58, an intermediate space 58Z can be provided, which is suitable for receiving, for example, an electrical line 84 between the control module 16 and the energy store interface 80. Furthermore, the peripheral wall 58 can be configured in the form of a collar that projects from the peripheral wall 53 of the motor housing 52. The peripheral wall 58 can contribute to the reinforcement of the peripheral wall 53.

[0181] The handgrip portion 60 includes a handgrip body 61 that extends from the machine housing 50 in a direction transverse to the tool axis WA. The handgrip body 61 is grippable by an operator's hand.

[0182] The longitudinal axis L61 of the handgrip body 61 preferably extends perpendicular to the tool axis WA, but can also have a small angle thereto, in particular less than 30°, preferably less than 20° or less than 10°. The longitudinal axis L61 of the handgrip body 61 preferably has an inclination of less than 10° with respect to the working surface 44. If the longitudinal axis L61 has an inclination with respect to the working surface 44, then the longitudinal end region of the handgrip body 61 remote from the motor housing 52 is preferably arranged further from the plane E44 in which the working surface 44 is located than the longitudinal end region of the handgrip body 61 connected to the motor housing 52.

[0183] In principle, it would now be possible for the electrical energy store 90 to be held directly in the handgrip body 61, for example if an energy store interface in the form of the energy store interface 80 described below is arranged in the handgrip body 61. Such an energy store interface could, for example, be provided in the free end region of the handgrip body 61, which faces away from the motor housing 52.

[0184] However, an embodiment has been chosen here in which the energy accumulator interface 80 is arranged on a connecting projection 62 which projects from the motor housing 52 .

[0185] For example, it would be easy to consider both arrangements in which the energy accumulator interface 80 is arranged on the connection projection 62 and, in addition, on the handgrip body 61 .

[0186] The connecting projection 62 faces the handgrip body 61, so that between the connecting projection 62 and the handgrip body 61 there is provided a predetermined distance, here configured as or including a gripping opening 63, through which the operator can grip around the handgrip body 61. The gripping opening 63 is

[0187] The connecting projection 62 is closer to the work surface 44 than the hand grip body 61 .

[0188] The connecting projection 62, like the handgrip body 61, projects transversely from the drive part 51 in the direction of the longitudinal machine axis LM to the tool axis WA.

[0189] The machine longitudinal axis LM extends, for example, through a machine longitudinal central plane EM of the hand grinder 10 or of the machine housing 50. The machine longitudinal central plane EM is at an angle to the working plane 44, for example at a right angle.

[0190] Advantageously, the rotation axis D of the drive motor 11 and / or the tool axis WA are parallel to the longitudinal central machine plane EM.

[0191] An operator holding the hand grinder 10 at the hand grip body 61 can guide the hand grinder 10 forward along the workpiece, for example in a working direction AR which is parallel or substantially parallel to the machine longitudinal axis LM.

[0192] The longitudinal axis L61 of the handgrip body 61 is, for example, perpendicular to the tool axis WA.

[0193] The longitudinal axis L62 of the connecting protrusion 62 is inclined at an angle of, for example, about 15 to 30 degrees with respect to the tool axis WA.

[0194] Whereas in a non-illustrated embodiment of the hand grinder 10 or of the present invention, one longitudinal end of the connecting projection 62 is connected to the motor housing 52 or the drive part 51, and the other longitudinal end of the connecting projection 62 opposite thereto could form a free end, in the present hand grinder 10 it is connected to a longitudinal end of the hand grip body 61 opposite the drive part 51 or the motor housing 52, whereby the hand grip body 61 and the connecting projection 62 form a construction defining the gripping opening 63 and / or are supported against each other in their end region opposite the drive part 51. The hand grip body 61 and the connecting projection 62 thereby reinforce or support each other.

[0195] Advantageously, the handgrip body 61 and the connecting projection 62 have an overall U-shaped or V-shaped configuration in the transverse direction (left-right direction) relative to the longitudinal machine axis LM.

[0196] The hand grip body 61 and the connecting lugs 62 together with the motor housing 52, which is closed at its periphery by the peripheral wall 53, form a robust machine housing 50 which is optimally suited for the operational running of the hand grinder 10. Furthermore, due to its robust construction, the machine housing 50 is resistant to impacts, in particular if the hand grinder 10 is dropped to the floor.

[0197] The energy accumulator interface 80 is arranged on the side facing the work surface 44 at the connection protrusion 62. The energy accumulator interface 80 comprises an energy accumulator holder 81 for removably holding the energy accumulator 90 and for establishing an electrical connection to the energy accumulator 90.

[0198] The energy store holder 81 is received in the holder receptacle 70. The energy store holder 81 is held in the holder receptacle 70 in a form-locking manner.

[0199] The holder receptacle 70 comprises side walls 71 which are provided with receiving grooves or engagement contours for receiving longitudinal side surfaces 82 of an energy accumulator holder 81. Furthermore, on the longitudinal side surfaces 82 of the energy accumulator holder 81, holding projections 83 are arranged which engage in holding receptacles 73 of the holder receptacle 70. The holding receptacles 73 are arranged on the side walls 71. The machine side surfaces of the energy accumulator holder 81 which extend between the longitudinal side surfaces 82 are supported at the bottom of the holder receptacle 70.

[0200] Advantageously, the holding projection 83 is a component of a damping member or element and is, for example, elastically flexible, so that the energy store holder 81 is held in the machine housing 50 in an elastically damped manner, so that vibrations, for example of the drive motor 11, are transmitted relatively little to the energy store 90 and / or to the connecting contacts 89 and / or 99.

[0201] The carrier receiver 70 can be closed by a receiver closure 75. The receiver closure 75 constitutes one housing part of the machine housing 50. The receiver closure 75 has a longitudinal extension which is oriented in the direction of the machine longitudinal axis LM. The receiver closure 75 therefore has an elongated shape.

[0202] The receiver closure 75 is mounted on the connecting lug 62 in a mounting direction FR transverse to the longitudinal machine axis LM and can be screwed to the connecting lug 62 .

[0203] In this case, the receiver closure 75 and the connecting projection 62 have flush top wall portions 76, 66 and bottom wall portions 78, 68. The top wall portions 76, 66 are located opposite the handgrip body 61. The bottom wall portions 68, 78 and the top wall portions 66, 76 are arranged on opposite sides of the connecting projection 62 and the receiver closure 75. An energy store interface 80, in particular an energy store holder 81, is arranged on the bottom wall portions 78, 68.

[0204] Threaded domes 69 are arranged on the connecting projection 62 and are aligned with the screw receivers 79 when the receiver closure 75 is arranged on the connecting projection 62. A screw 79A can then be threaded through the screw receivers 79 into the threaded domes 69. The receiver closure 75 is thus fixedly held on the connecting projection 62.

[0205] Furthermore, the receiver closure 75 is held on the connecting lug 62 by means of a plug-in device 74 .

[0206] The plug-in device 74 comprises a plug projection 74A which engages in a plug receptacle 74B. For example, the plug receptacle 74B is arranged on the receptacle closure 75 and the plug projection 74A is arranged on the connecting projection 62, although the reverse configuration is also possible, in which the plug projections are provided on the receptacle closure 75 and engage in plug receptacles on the connecting projection 62. The plug projections 74A and the plug projections 74B are arranged next to each other in a line arrangement, in particular along a line axis, which line axis extends parallel to the longitudinal axis L62 of the connecting projection 62, for example, or is inclined at a small angle, less than 10°.

[0207] Preferably, the plug receiver 74B is defined between the top wall 76 and the bottom wall forming the bottom 72 of the holder receiver 70. As shown in FIG.

[0208] When the receiver closure 75 is held on the connecting protrusion 62, the end face of the wall portion of the receiver closure 75 having the form of plug-in protrusion 74C engages with a step contour or step 74D at the end face of the wall portion of the connecting protrusion 62, thereby realizing a further plug-in connection of the plug-in device 74.

[0209] In particular, it is advantageous that the plug-in device 74 is arranged in the region of the holder receiver 70 and thus in the region of the energy accumulator interface 80 for holding the energy accumulator 90, thereby resulting in a fixed retention of the receiver closure 75 on the connecting protrusion 62 as well as a fixed retention of the energy accumulator holder 81 in the holder receiver 70.

[0210] The connecting projection 62 as well as the receiver closure 75 have side walls 67, 77 on opposite or opposing sides.

[0211] Further reinforcement of the machine housing 50 is provided by the connecting projection 62 as well as by the steps 64, 65 on the receiver closure 75. These steps 64, 65 are arranged in the area of ​​the grip opening 63. The step 64 is arranged close to the motor housing 52, and the step 65 is arranged in the end area of ​​the connecting projection 62 as well as of the receiver closure 75 remote from the motor housing 52, where the handgrip body 61 is connected to the connecting projection 62.

[0212] The motor housing 52 as well as the connecting projection 62 are provided or arranged integrally in the housing base 59A of the machine housing 50. This measure advantageously contributes to the rigidity of the machine housing 50.

[0213] The housing base body 59A is closed by a housing lid part 59B, with a receiving space 59C being formed between the housing base body 59A and the housing lid part 59B in which the control device 15, in particular the control module 16, is arranged.

[0214] The hand grip body 61 is formed in part by the housing lid 59B, i.e. by a hand grip portion 59I of the housing lid 59B, which closes a hand grip portion 59H of the housing base 59A which extends beyond the motor housing 52. The hand grip body 61 is of a two-piece type, consisting of hand grip portions 59H and 59I.

[0215] The housing lid 59B is screwed to the housing base 59A, for example by means of a screw 59F which is inserted through an insertion opening 59E in the housing lid 59B and screwed into a threaded receiver 59D in the housing base 59A.

[0216] The basic concept of providing an energy storage interface 80 on the connection projection 62 also allows for a convenient routing of electrical wiring, for example wiring 84 .

[0217] Advantageously, the housing lid 59B is provided with a passage opening 59G for the switch elements 17, 18, 19, through which the operating parts of said switch elements 17, 18, 19 project outside the outer surface of the housing lid 59B and thus outside the outer surface of the machine housing 50, so that they can be operated by an operator. The switch element 18, as well as the electrical components of the switch element 19, are arranged, for example, on the printed circuit board 16A or directly on the control module 16. In the drawings, for example, the switch element 19 is explicitly depicted only with its operating components, which, however, cooperate directly with the control module 16 with electrical components, for example electrical contacts. The switch element 17 is connected to the control module 16 by means of a short electrical wiring 17A, which is guided, for example, past the side of the lid 56 of the motor housing 52.

[0218] It should be mentioned here that the housing lid 59B has a support surface or support contour 59J which supports on the upper wall 54 of the motor housing 52. This measure also contributes to the rigidity and stable structure of the machine housing 50.

[0219] The energy store interface 80 has form-locking contours 88 for engaging with form-locking contours 98 of the connection interface 90A of the energy store 90, which form-locking contours 98 are arranged, for example, on the upper surface 93 of the energy store housing 91. The form-locking contours 88 are arranged at least partially on the energy store carrier 81.

[0220] The form-fitting contours 88, 98 include, for example, longitudinal grooves which extend along an insertion direction along which the energy accumulator 90 can be inserted into the energy accumulator interface 80 by means of its connection interface 90A.

[0221] In the plugged-in state, the energy accumulator 90 can be locked to the energy accumulator interface 80 by means of locking means. These locking means comprise, for example, a locking receptacle 88A at the energy accumulator interface 80, into which a locking projection 98A of the connection interface 90A can engage. The locking projection 98A can be disengaged from the locking receptacle 88A by means of at least one operating element 98B, for example by means of at least one pressing operating element at the longitudinal side portions 94 and / or 95.

[0222] Furthermore, the connection interface 90A has connection contacts 99, in particular plug-in contacts, such as electrical current supply contacts 99A, data contacts 99B, for electrical contact with the connection contacts 89, i.e. current supply contacts 89A and data contacts 89B, which likewise preferably are configured as plug-in contacts, of the energy store interface 80. The current supply contacts 99A have a predefined longitudinal distance from the data contacts 99B, and the current supply contacts 89A and the data contacts 89B also have this longitudinal distance from each other.

[0223] The current supply contacts 89A and the data contacts 89B are preferably arranged on the energy store carrier 81.

[0224] The energy accumulator 90 can therefore supply current to the control device 15 and to the drive motor 11 if the energy accumulator 90 is connected to the energy accumulator interface 80 .

[0225] An energy accumulator 90 can be fastened to the energy accumulator interface 80 of the hand grinders 10A, 10B, 10C, 10D. The energy accumulator 90 comprises a accumulator cell SP, for example a battery cell, which can supply electrical energy and is rechargeable.

[0226] The energy storage device 90 is hereinafter referred to as a variation 90A and a variation 90B, where the electrical capacity and power capacity of the variation 90A is greater than the electrical capacity and power capacity of the energy storage device 90B, which has fewer storage cells SP than the energy storage device 90A. The energy storage devices 90A and 90B can be selectively used in the hand grinders 10A, 10B, 10C, and 10D.

[0227] For example, three layers of storage cells SP are filled in the energy storage device 90A, and two layers of storage cells SP are filled in the energy storage device 90B, whereby more or fewer layers of storage cells SP arranged one above the other can be provided in both the energy storage device 90A and the energy storage device 90B, i.e., for example, three or more storage cells SP are arranged in the direction perpendicular to the plane E44 in the energy storage device 90A, whereas only one storage cell SP or at most two storage cells SP are arranged one above the other in the direction perpendicular to the plane E44 in the energy storage device 90B.

[0228] Accordingly, the energy storage housing 91 of the energy storage device 90 has variants 91A and 91B, with the energy storage housing 91A receiving more storage cells SP than the energy storage housing 91B. For example, the spacing between the lower side 92 and the upper side 93 of the energy storage housings 91A and 91B is of different size. For reasons of simplicity, both energy storage housings 91A, 91B are described below as energy storage housing 91.

[0229] Between the lower side 92 and the upper side 93 of the energy accumulator housing 91 extend longitudinal side sections 94, 95, with the longitudinal side section 94 facing towards the machine housing 50 and the longitudinal side section 95 forming a free longitudinal side section when the energy accumulator 90 is fixed to the machine housing 50. Furthermore, between the upper side 93 and the lower side 92 extend a front side section 97 and a rear side section 96, with the rear side section 96 being further away from the disk tool 40 than the front side section 97, which is arranged closer to the disk tool 40, when the energy accumulator 90 is attached to the energy accumulator interface 80. This results in a favorable center of gravity position.

[0230] The suction hose 200 as well as the dust container 300 , 400 have connecting elements 201 , 301 , 401 , for example pipe-shaped or sleeve-shaped connecting elements, by means of which the suction hose 200 or the dust container 300 , 400 can be connected to the connection piece 31 .

[0231] The dust discharge connection 30, in particular the connecting piece 31, extends along a longitudinal extension axis L30. The connecting piece 31 defines a flow passage 33 which extends along the longitudinal extension axis L30.

[0232] The respective connecting element 201, 301, 401 therefore also extends along the longitudinal extension axis L30 when the connecting element 201, 301, 401 is plugged into the connecting piece 31. The part of the suction hose 200 connected to the connecting element 201 likewise has an orientation or longitudinal extension which is oriented parallel to the longitudinal extension axis L30 or at a small angle to the longitudinal extension axis L30, for example at most 15°, in particular at most 10° or particularly preferably at most 5°. The suction hose 200 thus has an orientation which corresponds to the longitudinal extension axis L30 in the vicinity of the dust discharge connection 30.

[0233] The connecting elements 201, 301, 401 are oriented rearward in the working direction AR.

[0234] The connection elements 301 and 401 are arranged on the front sides 307 and 407 of the dust containers 300 and 400. In the opposite rear sides 306 and 406, the dust containers 300 and 400 advantageously have removal openings 308 and 408 for removing dust collected in the interior space of the dust containers 300 and 400. When the respective dust container 300 or 400 is fixed to the dust discharge connection 30, between the front sides 307 and 407 extend longitudinal side sides 304 and 404 directed towards the machine housing 50 as well as longitudinal side sides 305 and 405 directed away from the machine housing 50. When each dust collection container 300 or 400 is placed in the dust discharge connection 30, between the longitudinal side portions 304 and 404 and the longitudinal side portions 305 and 405 extend the lower surface portions 302 and 402 of each dust collection container 300 or 400, which are closer to the working surface 44, and the upper surface portions 303 and 403, which are further away from the working surface 44.

[0235] The energy accumulator interface 80 has a preferred position in the machine housing 50 with respect to the work surface 44 and with respect to the dust exhaust connection 30, which will become apparent below:

[0236] The energy accumulator interface 80 is arranged on the machine housing 50 in such a way that the energy accumulator 90 is closer to the working surface 44 than the dust exhaust connection 30. The undersides 92 of the energy accumulators 90A, 90B have a minimum energy accumulator spacing SEA, SEB in the direction perpendicular to the plane E44 on which the working surface 44 is arranged, which is smaller than the dust exhaust connection spacing SA of the dust exhaust connection 30 with respect to this plane E44 or the working surface 44. The respective energy accumulator 90A, 90B thus reaches very close to the working surface 44, which results in a favorable center of gravity position of the hand grinders 10A, 10B.

[0237] FIG. 9 suggests (in dashed lines) an alternative arrangement with the dust exhaust connection 30B somewhat further away from the work surface 44, the dust exhaust connection 30B having a dust exhaust connection spacing SAB relative to the work surface 44 in a direction perpendicular to the plane in which the work surface 44 extends.

[0238] Furthermore, the energy accumulator interface 80 is not symmetrical but asymmetrical with respect to the machine longitudinal axis LM or to the machine longitudinal midplane EM through which the machine longitudinal axis LM extends.

[0239] Thus, for example, the energy store longitudinal center plane EE has a transverse distance (left-right distance) QE to the machine longitudinal center plane EM.

[0240] In this case, this lateral spacing QE is also so large that the energy accumulator 90 is arranged almost completely laterally beside the machine longitudinal central plane EM, see in particular FIGS.

[0241] The dust discharge connections 30 or 30B are also not arranged symmetrically about the mid-machine direction plane EM, but have a transverse distance QS relative to the mid-machine direction plane EM.

[0242] The dust discharge connection longitudinal midplanes E3 of both dust discharge connections 30 and 30B, which are parallel to the machine longitudinal midplane EM, are arranged at a transverse distance QS to the machine longitudinal midplane EM.

[0243] This results in a configuration in which the dust discharge connection 30 and the energy accumulator 90 are arranged on opposite sides of the machine longitudinal midplane EM.

[0244] However, the energy accumulator 90 and the dust discharge connection 30 do not extend laterally outside the disk tool 40 with respect to the machine longitudinal axis LM or the machine longitudinal midplane EM, which can be seen in FIGS.

[0245] The disk tools 40A, 40B are arranged in a corridor section KO with respect to the machine longitudinal axis LM and / or the machine longitudinal mid-plane EM, the corridor section KO being bounded by lateral corridor section planes KL and KR, and the disk tools 40A or 40B do not extend outside the corridor section planes KL and KR in the transverse direction to the machine longitudinal axis LM or the machine longitudinal mid-plane EM. These planes KL and KR are parallel to the machine longitudinal mid-plane EM and / or perpendicular to the working surface 44 or the plane E44 in which the working surface 44 extends. The energy accumulator 90 and the dust discharge connection 30 are located between the planes KL and KR.

[0246] However, it is also possible that a disk tool 40C, in particular a circular disk tool, having a smaller diameter than the disk tool 40A is arranged on the hand grinder 10 (FIG. 9). In this case, the corridor section planes KL and KR are spaced apart from each other at a shorter distance, i.e. the corridor section KO is narrower.

[0247] 9, it can be seen that, for example, the energy accumulator 90B (for the disk tool 40C) projects with its longitudinal side 95 outside the corridor section plane KL at a distance Q1. The longitudinal side 95 extends, for example, in a plane K95 that is parallel to the machine longitudinal midplane EM and has a distance Q1 from the corridor section plane KL.

[0248] The energy accumulator 90B is arranged asymmetrically relative to the longitudinal machine center plane EM, but the spacing Q1 is small, for example at most 15 mm, in particular at most 10 mm, preferably at most 5 mm, or, in other words, the spacing Q1 is at most 15%, in particular at most 10%, particularly preferably at most 8% of the diameter of the disk tool 40C.

[0249] The outer side 35 of the dust discharge connection 30 facing away from the machine housing 50 extends in a plane K35 parallel to the machine longitudinal central plane EM. The dust discharge connection 30, in particular its side 35, does not extend outside the corridor section plane KR.

[0250] The longitudinal side 405 of the dust collecting container 400 extends in a plane K405 that is parallel to the longitudinal machine center plane EM. With its longitudinal side 405 facing away from the machine housing 50, the dust collecting container 400 projects outside the disk tool 40C and / or the corridor section plane KR by a lateral distance Q2, i.e., there is a lateral distance Q2 between the corridor section plane KR and the plane K405. The lateral distance Q2 has, for example, a value of at most 20%, in particular at most 15%, preferably at most 10% of the diameter of the disk tool 40C.

[0251] The dust discharge passage or channel 33 defines for the suction hose 200 an orientation which corresponds to a longitudinal extension axis L30 of the dust discharge passage or channel 33. In Fig. 12 it can be seen that the suction hose 200, which is correspondingly arranged at the dust discharge connection 30, is also oriented in its inlet region close to the dust discharge connection 30 in the direction of the longitudinal extension axis L30 and thus in the corridor between the planes KL and KR.

[0252] However, if the longitudinal extension axis L30 of the flow passage of the dust discharge connection 30C, 30D runs at an angle to the machine longitudinal midplane EM or the machine longitudinal axis LM, i.e. has an angle W1 or W2 with respect to the machine longitudinal midplane EM or the machine longitudinal axis LM, the part of the suction hose 200 connected to the respective dust discharge connection 30C or 30D extends outside one of the corridor section planes, i.e. the corridor section plane KR. However, even in this situation, the asymmetric arrangement of the energy accumulator 90 with respect to the machine longitudinal midplane EM has the advantage that a larger space is provided for the suction hose 201 on the side opposite the energy accumulator 90 to the machine longitudinal midplane EM.

[0253] The hand grinders 10E (FIGS. 20-22) and 10F (FIG. 23) have machine housings 50E, 50F which are substantially the same as the machine housing 50, but have differently arranged energy storage interfaces and dust exhaust connections 30E and 30F. The hand grinders 10E and 10F also have drive motors (not visible in the drawings) in the form of drive motors 11, by means of which the disc tool 40 is driven or can be driven.

[0254] In the hand grinder 10E, the energy accumulator interface is arranged such that the energy accumulator 90, which is arranged, for example, in the variant 90A on the machine housing 50E, is arranged completely below the dust discharge connection 30E. With respect to the plane in which the working surface 44 extends, the underside 32 of the dust discharge connection 30E has a dust discharge connection spacing SAE and the underside 92 of the energy accumulator 90 has an energy accumulator spacing SEE, where the dust discharge connection spacing SAE is clearly greater than the energy accumulator spacing SEE. The dust discharge connection 30E is arranged completely above the upper side 93 of the energy accumulator 90.

[0255] To transport dust air (indicated by the black arrow) from the disk tool 40 in the direction of the dust discharge connection 30E, the hand grinder 10E has a flow passage 33E extending from the disk tool 40, through the machine housing 50E to the dust discharge connection 30E.

[0256] The hand grinder 10F is also provided with a flow passage, namely a flow passage 33E, which runs through its machine housing 50F. The flow passage 33E leads to a dust discharge connection 30F, which is arranged at least substantially above an upper surface 93 of an energy accumulator 90 arranged at an energy accumulator interface of the hand grinder 10F. With respect to the plane in which the working surface 44 extends, the lower surface 32 of the dust discharge connection 30F has a dust discharge connection spacing SAF and the lower surface 92 of the energy accumulator 90 has an energy accumulator spacing SEF, where the dust discharge connection spacing SAF is greater than the energy accumulator spacing SEF.

[0257] In the hand grinders 10E and 10F, advantageously, the energy store longitudinal center plane, not shown in the drawings, of each energy store 90 has a predefined transverse distance to the machine longitudinal center plane EM, as can be seen by looking at Figures 21 and 22 together.

[0258] The dust discharge connection 30E is arranged symmetrically with respect to the machine longitudinal midplane EM, whereas the dust discharge connection 30F is arranged asymmetrically with respect to the machine longitudinal midplane EM, see FIG. 23.

[0259] Variations of the energy accumulator interface 80 are shown diagrammatically in Fig. 8 and Fig. 9. For example, the energy accumulator interface 80E can have energy accumulator interface connections 80E1 and 80E2, to which the energy accumulators 90E1 and 90E2 can be removably attached. For example, the energy accumulator interface connections 80E1 and 80E2 are both arranged asymmetrically next to each other laterally of the machine longitudinal midplane EM, so that the energy accumulator interface 80E is completely asymmetric with respect to the machine longitudinal midplane EM. However, it is also possible, for example, for the energy accumulator interface connection 80E1 to be completely laterally to the machine longitudinal midplane EM, whereas the energy accumulator interface connection 80E2 is partially passed by the machine longitudinal midplane EM. For example, the machine longitudinal midplane EM can extend laterally centrally or approximately laterally centrally with respect to the energy accumulator interface connection 80E2.

[0260] Alternatively, embodiments are also possible in which several energy accumulator interface connections are arranged one behind the other in a row along a line that runs approximately parallel to the machine longitudinal central plane EM or along a line that has a slight oblique inclination to the machine longitudinal central plane EM, for example in the manner of the dust collecting container 300 according to Fig. 10. Fig. 8 suggests such an embodiment, for example with energy accumulator interface connections 80F1 and 80F2 of the energy accumulator interface 80F, to which energy accumulators 90E1 and 90E2 can be connected.

[0261] A combination of both of the above-mentioned embodiments is also easily possible, i.e. for example a combination of energy store interface connections 80F1 and 80E2 is also easily possible, whereby a tiered arrangement of the energy store interface connections is realized.

Claims

1. A hand grinder having a disk tool (40) with a working surface (44) for working a workpiece (WST) and a machine housing (50) in which a drive motor (11) for driving a tool receiving part (14) in which the disk tool (40) is arranged is arranged, The machine housing (50) has a drive portion (51) having a motor housing (52) having a motor receiving space (55) in which the drive motor (11) is received, and the motor housing (52) has an integral peripheral wall portion (53) surrounding the motor receiving space (55) in an annular shape. a connecting projection (62) is arranged on the peripheral wall (53), which extends along the longitudinal machine axis (LM) of the machine housing (50) and is in particular integral with the machine housing (50), and on which an energy accumulator interface (80) is arranged for removably connecting an electrical energy accumulator (90) for the electrical energy supply of the hand grinder (10), A hand grinder that features:

2. the hand grinder (10) has a hand grip portion (60) in which the hand grinder can be held by an operator and can be guided forward along the workpiece (WST), in particular in a working direction (AR) parallel to the longitudinal machine axis (LM) of the machine housing (50) or having a parallel directional component, and the connection projection (62) and / or at least a part of the hand grip portion (60) projects rearward from the motor housing (52) in the working direction (AR), 2. The hand grinder of claim 1 .

3. the handgrip portion (60) is arranged on a handgrip body (61) arranged on the machine housing (50), in particular at least partially integral with the machine housing (50), the handgrip body (61) protruding rearward from the motor housing (52) in the working direction (AR); 3. The hand grinder according to claim 1 or 2, characterized in that

4. the hand grip body (61) is supported by the connecting projection (62) or the connecting projection (62) completely or partially forms the hand grip body (61); 4. The hand grinder according to claim 3 .

5. the hand grip body (61) and the connecting lug (62) are connected to each other directly in the region of one end facing away from the motor housing (52) and / or are connected to each other by the motor housing (52) in the region of the motor housing (52); 5. The hand grinder according to claim 3 or 4, characterized in that

6. a gripping opening (63) is provided between the hand grip body (61) and the connection protrusion (62), and the gripping opening (63) allows the hand of an operator gripping the hand grip body (61) to pass through; 6. A hand grinder according to claim 3, 4 or 5, characterized in that

7. said hand grip body (61) and said connecting projection (62) have or form, in a direction transverse to said longitudinal machine axis (LM), a generally V-shaped or U-shaped overall configuration; The hand grinder according to any one of claims 3 to 6, characterized in that

8. said handgrip body (61) and said connecting projection (62) have wall portions facing each other extending transversely to said longitudinal machine axis (LM), the transverse width of said wall portion of said connecting projection (62) having a value of at least 80%, preferably at least 90%, of the transverse width of said wall portion of said handgrip body (61) in the region of said machine housing (50); The hand grinder according to any one of claims 3 to 7, characterized in that

9. the energy accumulator interface (80) has an energy accumulator holder (81) separate from the connection projection (62) for holding the energy accumulator (90) in a form-fitting manner, the energy accumulator holder (81) being received in a holder receiver (70) arranged on the connection projection (62); The hand grinder according to any one of claims 1 to 8, characterized in that

10. the carrier receiver (70) is closed by a receiver closure (75), in particular configured as a housing part, which is releasably connected or connectable, in particular screwable, to the connecting projection (62); 10. The hand grinder of claim 9.

11. the receiver closure (75) is attached to the connecting lug (62) in a mounting direction (FR) transverse to the longitudinal machine axis (LM) and / or the support area of ​​the receiver closure (75), which supports the receiver closure (75) on the connecting lug (62), has a greater longitudinal extension with a directional component parallel to the longitudinal machine axis (LM) than in a transverse direction, in particular at right angles to the longitudinal machine axis (LM), 11. The hand grinder of claim 10.

12. a plug-in device (74) is arranged on the receiver closure (75) and on the connecting lug (62) having at least one plug-in lug (74A) and at least one plug-in receiving lug (74B) for receiving the plug-in lug (74A), the plug-in lug (74A) and the plug-in receiving lug (74B) engaging with each other and / or being positioned and supported with respect to each other in the sense of the positioning of the receiver closure (75) on the connecting lug (62) when the receiver closure (75) is attached to the connecting lug (62); 12. The hand grinder according to claim 10 or 11,

13. The plug-in device (74) comprises a line arrangement of a plurality of plug-in projections and plug-in receiving portions (74B) which are in engagement with one another when the receiving portion closure (75) is attached to the connecting projection (62) and / or at least one plug-in receiving portion (74B) of the plug-in device (74) is formed by spaced-apart wall portions, one of which faces the energy accumulator holder (81). the other wall part forms an outer wall part of the connecting lug (62), in particular facing for its support, and / or at least one plug-in receiving part (74D) of the plug-in device (74) is formed by a step (74D) or a receiving groove into which a plug-in lug (74C) engages, the step (74D) or the receiving groove as well as the plug-in lug (74C) being arranged on an end face of the wall of the connecting lug (62) and on an end face of the wall of the receiving part closure (75), 13. The hand grinder of claim 12.

14. the energy accumulator interface (80), in particular the energy accumulator holder (81), has an elongated shape and extends along the connecting projection (62) and / or has form-fitting contours (88) extending along its longitudinal extent, in particular longitudinal grooves and / or longitudinal projections and / or locking means for locking the energy accumulator (90), and / or has connection contacts (89A) for the energy accumulator (90) arranged closer to the motor housing (52) and connection contacts (89B) for the energy accumulator (90) arranged further away from the motor housing (52), in particular in its longitudinal end region furthest from the motor housing (52), The hand grinder according to any one of claims 1 to 13, characterized in that

15. the energy accumulator (90), when it is arranged on the energy accumulator interface (80), does not extend beyond the longitudinal end of the connecting projection (62) and / or the handgrip body (61) facing away from the motor housing (52) or extends beyond it by at most 20%, in particular by at most 10%, preferably by at most 5% of the longitudinal extension of the energy accumulator (90); The hand grinder according to any one of claims 1 to 14, characterized in that

16. the wall portion of the connecting projection (62) extending along the longitudinal machine axis (LM) has steps (64, 65) transversely to the longitudinal machine axis (LM); The hand grinder according to any one of claims 1 to 15, characterized in that

17. the motor housing (52) has a top wall (54) which closes the motor receiving space (55) at its end side and is in particular integral with the peripheral wall (53); The hand grinder according to any one of claims 1 to 16, characterized in that

18. the motor receiving space (55) is closed or closable by a lid (56) removably connectable to the motor housing (52); The hand grinder according to any one of claims 1 to 17, characterized in that

19. the lid (56) is formed by a cover (23A) for the disk tool (40) and / or a suction hood (23); 20. The hand grinder of claim 18.

20. the motor receiving space (55) extends between the upper wall portion (54) and the lid portion (56); 20. Hand grinder according to claim 18 or 19, characterized in that

21. the lid (56) is provided for closing an installation opening (55E), and the drive motor (11) can be introduced into the motor receiving space (55) through the installation opening (55E), and / or the motor receiving space (55) is accessible for introducing the drive motor (11) only by removing the lid (56); The hand grinder according to any one of claims 18 to 20, characterized in that

22. on the side of the peripheral wall (53) facing away from the motor receiving space (55), there is a support wall, in particular in the form of a collar and / or a flange and / or integral with the peripheral wall (53), which projects outwards, The hand grinder according to any one of claims 1 to 21, characterized in that

23. the connecting projection (62), in particular the part of the connecting projection (62) facing the handgrip body (61), is supported on and / or is integral with the supporting wall; The hand grinder according to any one of claims 1 to 22, characterized in that

24. the machine housing (50) has a housing base (59A), the housing base (59A) integrally including the motor housing (52) and the connection projection (62), in particular also the hand grip body (61), the housing base (59A) being closed or closable by a housing lid (59B); The hand grinder according to any one of claims 1 to 23, characterized in that

25. the housing lid (59B) extends over the entire longitudinal machine axis (LM) of the machine housing (50), in particular of the housing base body (59A), or substantially over the entire longitudinal machine axis (LM); 25. The hand grinder of claim 24.

26. said housing lid (59B) forms a component of the handgrip portion (60), in particular a component of the handgrip body (61); 26. Hand grinder according to claim 24 or 25, characterized in that

27. the housing lid (59B) and the connecting projection (62) are arranged on opposite sides of the hand grip body (61) and / or the connecting projection (62) is arranged closer to the disc tool (40) than the housing lid (59B); The hand grinder according to any one of claims 24 to 26, characterized in that

28. the housing lid (59B) covers the motor housing (52) on the side of the machine housing (50) opposite the disk tool (40), in particular completely; The hand grinder according to any one of claims 24 to 27, characterized in that

29. said housing lid (59B) closes a receiving space (59C) for a control device (15) of said hand grinder (10), in particular a control module (16); The hand grinder according to any one of claims 24 to 28, characterized in that

30. at least one switch element (17, 18, 19), preferably all switch elements (17, 18, 19) operable by an operator for switching on / off functions of the hand grinder (10) which can be actuated by a control device (15) and / or which are electrical, is arranged in the receiving space (59C) and / or at least one switch element (17, 18, 19) is arranged on a printed circuit board (16A) or on a control module (16) of the control device (15), 30. The hand grinder of claim 29.

31. the housing base (59A) is made of a harder material than the housing lid (59B) and / or the housing lid (59B) has at least one elastic or soft or cushioning component on its outer surface opposite the housing base (59A) and / or the housing base (59A) is made of less material than the housing lid (59B), in particular only one material, The hand grinder according to any one of claims 24 to 30, characterized in that

32. said housing lid (59B) and said receptacle closure (75) having no direct contact; The hand grinder according to any one of claims 24 to 31, characterized in that

33. the housing lid portion (59B) is positioned to face an upper wall portion (54) closing the motor receiving space (55) and / or covers the upper wall portion (54) entirely or partially; The hand grinder according to any one of claims 24 to 32, characterized in that

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