Grinding machine with an external air inlet

Abstract

The invention relates to a grinding machine (11) with a machine housing (15) and a drive motor (12), in particular an electric motor, arranged in the machine housing (15) for rotating and / or oscillatingly driving a tool holder (14) to which a disc tool (90) can be detachably attached, wherein the grinding machine (11) has a cover (30) for the disc tool (90) which defines a dust extraction chamber (31) in which the tool holder (14) is arranged and which is provided and designed to receive the disc tool (90) when the disc tool (90) is arranged on the tool holder (14), wherein a dust extraction port (33) through which a dust air stream flows is arranged on the dust extraction chamber (31), to which a dust extraction device (50), in particular forming a component of the grinding machine (11) or of a system comprising the grinding machine (11), is connected.In particular, a suction hose (70A) can be connected to the grinding machine (11) for connecting it to a vacuum cleaner (STA) or a dust collection device (70), wherein the dust airflow is provided for conveying dust generated during operation of the grinding machine (11) from the dust extraction chamber (31). Apart from and separate from the dust extraction port (33), at least one external air inlet (40) for introducing external air (F) is arranged on the dust extraction chamber (31), and the grinding machine (11) has a closing device (41A, 41B) arranged on or actuated by the dust extraction device (50), with which the external air inlet (40) can be completely or at least partially closed.

Description

[0001] The invention relates to a grinding machine with a machine housing and a drive motor, in particular an electric one, arranged in the machine housing for rotating and / or oscillating a tool holder to which a disc tool can be detachably fastened, wherein the grinding machine has a cover for the disc tool, which delimits a dust removal chamber in which the tool holder is arranged and which is provided and designed to receive the disc tool when the disc tool is arranged on the tool holder, wherein a dust removal connection through which a dust air stream can flow is arranged on the dust removal chamber, to which a dust removal device, in particular a suction hose for connecting the grinding machine to a vacuum cleaner or a dust collection device, can be connected, in particular forming a component of the grinding machine or of a system comprising the grinding machine,the dust air flow is intended to remove dust generated during operation of the grinding machine from the dust removal room.

[0002] Typical sanders allow a dust collection container, a suction hose or the like to be connected to their dust removal connection so that dust that is created, for example, when sanding a workpiece, can be discharged into the dust collection container or vacuumed up by the vacuum cleaner.

[0003] When operating the sander with a vacuum cleaner, a high vacuum is usually present at the dust extraction connection, meaning the sander and its disc tool are essentially sucked onto the workpiece surface. This may improve work comfort to a certain extent, because, for example, the sanding tool is always resting on or against the workpiece surface. However, if the suction power is too high, the sanding tool can no longer be moved easily.

[0004] Furthermore, modern vacuum cleaners also feature suction flow monitoring to ensure adequate dust removal. However, when the disc tool is sucked onto the workpiece, the suction flow drops and the negative pressure in or at the dust removal port increases, so that at least a warning is issued by the vacuum cleaner if adequate dust removal is no longer guaranteed.

[0005] To avoid such situations, it is well known to provide a certain degree of leakage in the dust collection chamber, for example, by providing inlet openings on the outer perimeter of the dust collection chamber through which external air can flow into the chamber. However, when operating with a dust collection container, such external air inlets can be disruptive.

[0006] It is therefore the object of the present invention to provide an improved grinding machine.

[0007] To achieve the object, in a grinding machine of the type mentioned at the outset, it is provided that at least one external air inlet for admitting external air is arranged on the dust removal chamber away from and separately from the dust removal connection, and the grinding machine has a closure device, arranged in particular on the dust removal device or actuatable by the dust removal device, with which the external air inlet can be closed completely or at least partially.

[0008] Furthermore, to achieve the object, a dust removal device, in particular a dust collection device, for use with a grinding machine according to the invention serves, wherein the dust removal device has a closure device, in particular a closure part, for closing the external air inlet of the grinding machine.

[0009] The dust removal device can advantageously be detachably attached to a dust removal connection of the grinding machine, for example plugged onto the dust removal connection.

[0010] A fundamental concept of the present invention is that an external air inlet does not always have to remain open, but can be closed as needed. Particularly when operating with the dust collection container or a dust collection device, it is advantageous if the external air inlet is completely or at least partially closed or closable. However, when connecting the vacuum cleaner, for example, the suction hose, the external air inlet can remain open or be opened by the closure device, so that the vacuum cleaner can always draw in a certain amount of external air and no excessive negative pressure develops in the area of the dust removal connection or the vacuum cleaner.

[0011] It is possible for the grinding machine to have multiple closure devices, for example, a closure device on the dust removal device and a closure device arranged on the machine housing. Therefore, if a closure device is described in the following description, this can be a closure device arranged on the grinding machine, in particular its machine housing, but also a closure device arranged on the dust removal device and / or forming a component of the dust removal device. The closure device could also be referred to as "at least one closure device."

[0012] It is possible, for example, for the external air inlet to be adjustable to a predetermined, fixed extent using the closure device of the dust removal device, for example by reducing the flow cross-section of the external air inlet by 50%, 60%, 70%, 80%, or 90% by the closure device of the dust removal device, when the latter is arranged on the external air inlet. A further closure device arranged on the grinding machine or its machine housing can, for example, bring about a further reduction in the flow cross-section. It is particularly advantageous if the closure device arranged on the machine housing of the grinding machine has an adjustable valve member which can be adjusted between an open position and a closed position.

[0013] The closure device is intended and / or designed to completely or partially close a flow cross-section of the external air inlet.

[0014] A flow cross-section of the external air inlet can be closed completely or preferably to at least 90%, even more preferably to at least 95% or 97%, by the closure device in its closed position.

[0015] The external air inlet can preferably be completely closed or hermetically closed using the closure device so that no external air can flow in through the external air inlet.

[0016] However, it is also possible for the external air inlet to be substantially but not completely closed by the closure device. It is thus possible for at least part of the external air inlet to be open to flow to such an extent that a small amount of external air can flow into the external air inlet. The closure device preferably makes it possible to cover and close the external air inlet by at least 80%, preferably at least 90%, even more preferably at least 95% or 98%. Advantageously, it can be provided that when the external air inlet is covered and / or closed by the closure device, a maximum of 20%, preferably 15%, even more preferably 10%, and finally even more preferably 5% of a volume flow of external air can flow in through the external air inlet compared to an external air inlet not covered by the closure device.If the closure device closes and / or covers the external air inlet, for example, at least 80-95% less external air passes through the external air inlet than if the external air inlet is not closed or covered by the closure device.

[0017] The closure device is advantageously designed such that it allows the amount of external air flowing through the external air inlet to be variably adjusted. For example, the closure device can comprise a valve member that is adjustably mounted between an open position that releases the external air inlet and a closed position that at least partially or completely closes the external air inlet, for example, on the grinding machine and / or on the dust removal device.

[0018] Advantageously, it is provided that the external air inlet is arranged away from the dust air flow flowing through the dust removal connection and / or the external air inlet has no flow connection to the dust air flow flowing through the dust removal connection outside the dust removal chamber and / or the external air inlet is flow-connected to the dust removal connection via the dust removal chamber.

[0019] The external air inlet is located away from the dust air flow flowing through the dust extraction port. The external air cannot flow directly into the dust air flow flowing through the dust extraction port. The external air first flows into the dust extraction chamber before it can flow into the dust extraction port, specifically as part of the dust air flow.

[0020] The dust removal connection has a closed and / or fluid-tight flow connection to the dust removal chamber.

[0021] For example, the dust removal connection or a channel of the dust removal connection runs towards a side wall of the cover without there being an opening or interruption at the dust removal connection in the sense of an external air inlet or the like.

[0022] The external air inlet has no flow connection to the dust removal connection and / or the dust air flow flowing through it, except for a flow connection via the dust removal chamber and / or the flow through the dust removal chamber. The dust removal chamber is directly connected to the dust removal connection, without any external air being able to flow into this flow path.

[0023] The cover advantageously encloses the dust removal chamber circumferentially with respect to a rotation axis of the tool holder, around which the tool holder can be driven by the drive motor.

[0024] Advantageously, the cover comprises a peripheral wall that extends circumferentially relative to the rotational axis of the tool holder. The dust removal connection and / or the external air inlet are preferably arranged on a peripheral wall.

[0025] The external air inlet and the dust removal connection are advantageously not provided on an end face of the cover and / or on an end face of the peripheral wall, wherein the end face faces the disc tool or is opposite the disc tool when the disc tool is mounted on the tool holder. Thus, the grinding machine is designed such that the external air flowing through the external air inlet does not flow past an end face of the cover or peripheral wall or through a slot or gap between the disc tool and the cover or peripheral wall into the dust removal chamber.

[0026] Advantageously, a seal is provided on the cover, in particular on the peripheral wall of the cover, for engagement with the disc tool, in particular with a mounting side of the disc tool. The mounting side and a machining surface of the disc tool intended for machining a workpiece surface are preferably arranged on opposite sides of the disc tool.

[0027] It is advantageous that the dust removal chamber, apart from the dust removal connection and the at least one external air inlet, is closed by the disc tool when the disc tool is arranged and / or mounted on the tool holder.

[0028] The grinding machine advantageously has a dust-generating air wheel for generating a dust-generating air flow or the dust-generating air flow. This makes it possible for the grinding machine to actively generate the dust-generating air flow and, for example, convey it to the dust collection device. The dust-generating air wheel is, for example, a fan wheel. The dust-generating air wheel preferably has blades for generating an air flow. The dust-generating air wheel is preferably a radial fan wheel for generating a radial air flow or dust-generating air flow. However, the dust-generating air wheel can also be an axial fan wheel for generating an axial air flow or dust-generating air flow.Furthermore, the dust air wheel can be a radial-axial fan wheel, which can generate both an axial and a radial air flow or, for example, can generate an axial air flow in the sense of a suction of dust air from the disc tool, which the fan wheel can, for example, blow out or further convey radially in the direction of the dust removal connection.

[0029] The dust air wheel is arranged, for example, in particular in a sandwich-like manner, between the drive motor on the one hand and the disc tool or the tool holder on the other hand.

[0030] For example, the tool holder is located directly on the dust air wheel.

[0031] At this point, it should also be mentioned with regard to the grinding machine that it can preferably have an eccentric gear and / or a gear for generating a hypercycloidal movement of the tool holder or the like, which is driven or can be driven by the drive motor and drives or has the tool holder. Furthermore, as an alternative or in addition to an eccentric gear and / or a gear for generating a hypercycloidal movement, the grinding machine can also provide an oscillating drive type for the tool holder or be configured as an oscillating drive. The grinding machine can, for example, have an oscillation gear that is driven or can be driven by the drive motor and drives or has the tool holder.

[0032] The dust-generating air wheel advantageously draws in external air flowing through the external air inlet to generate the dust-generating air stream. For example, the external air can flow in through the external air inlet and be conveyed further through the dust-generating air wheel. This external air then becomes dust-generating air, so to speak, by absorbing and / or entraining particles or dust generated during operation of the grinding machine, for example, when grinding a workpiece surface.

[0033] The dust air wheel is preferably provided and designed to suck in external air through the external air inlet and / or to generate the dust air flow.

[0034] At this point, however, it should be added that other air that does not flow through the external air inlet but, for example, flows into the dust removal chamber at the underside of the cover for the disc tool, can of course also form a component of the dust air flow or contribute to the generation of the dust air flow.

[0035] Furthermore, the dust removal chamber is advantageously designed such that air flowing through the disc tool entrains particles from a processing side of the disc tool intended for processing a workpiece and flows out of the dust removal chamber as a dust air stream through the dust removal connection.

[0036] Advantageously, the external air inlet is located directly next to the dust extraction connection and / or to the side of the dust extraction connection. This creates, for example, a compact arrangement of the dust extraction connection and external air inlet.

[0037] It should also be noted that the external air inlet can be referred to as "at least one external air inlet" and / or can comprise multiple external air inlets or external air inlet openings. For example, it is possible for the dust removal connection to be arranged between two external air inlets or two external air inlets. Furthermore, the flow cross-section of the at least one external air inlet can comprise at least two external air inlets. It is possible for the grinding machine to have at least one external air inlet that cannot be closed by a closure device or by the closure device. This external air inlet is thus permanently in an open position or ready for external air to flow through.

[0038] It is advantageous if the dust removal connection forms one or the outermost component with respect to a longitudinal center plane of the grinding machine, which extends, for example, along a longitudinal axis or main longitudinal axis of the machine housing and / or runs through the motor axis or tool axis, and / or the external air inlet is closer to the longitudinal center plane than the dust removal connection.

[0039] For example, it is advantageous if the dust removal connection, in particular an outlet opening of the dust removal connection, is further away from a center of the grinding machine and / or a rotational axis about which the tool holder is rotationally driven or rotatable than the at least one external air inlet, in particular an inlet opening of the external air inlet.

[0040] The dust removal connection, in particular an outlet opening of the dust removal connection, can have a greater distance from the tool holder than the external air inlet, in particular an inlet opening of the external air inlet.

[0041] The external air inlet can be arranged at a free end region of an external air duct, which has at least one inlet opening for the external air to flow into the dust removal chamber, in particular a receiving chamber for the dust air wheel. The inlet opening simultaneously forms an outlet opening through which the external air can flow out of the external air duct.

[0042] Advantageously, external air flowing in via the external air inlet does not flow entirely or substantially directly from the external air inlet to the dust removal connection, particularly when the dust collection device is connected to the dust removal connection, but is pre-conveyed by the dust air wheel through the dust removal chamber before flowing into the dust removal connection. A small portion of the external air flowing in via the external air inlet can flow directly to the dust removal connection, for example, if a corresponding negative pressure prevails at the dust removal connection, particularly when a vacuum cleaner is connected.However, if no vacuum cleaner is connected, it is advantageous if external air flowing in via the external air inlet must first be completely or almost completely pre-conveyed by the dust air wheel in the direction of the dust removal connection until it flows into the dust removal connection, in particular after collecting dust and other particles and / or as dust air.

[0043] The external air inlet or external air duct is preferably arranged on an intake section or in an intake area of the dust air wheel, so that the dust air wheel can suck in external air via the external air duct or external air inlet, but can blow out no or almost no dust air via the external air inlet or external air duct.

[0044] A flow direction of the external air in the direction of the dust air wheel, when the external air flows through the external air inlet or external air duct into a conveying area of the dust air wheel, is preferably oriented radially to a rotational axis of the dust air wheel or at an angle of maximum 20° or 30° obliquely to the rotational axis of the dust air wheel.

[0045] A surface of a flow cross-section of an inlet opening flow-connected to the external air inlet, via which external air flows into a receiving chamber in which the dust air wheel is arranged, is preferably oriented radially to a rotational axis or the rotational axis of the dust air wheel or oriented at a maximum of 20° or 30° obliquely to the rotational axis of the dust air wheel.

[0046] A direction of rotation of the dust air wheel and / or arrangement of the external air inlet is preferably provided such that the dust air wheel sucks in external air via the external air inlet and advances it over at least 40 degrees, preferably at least 60 degrees, more preferably at least 80 degrees, even more preferably at least 90 degrees around an axis, for example an axis of rotation of the dust air wheel provided for generating the dust air flow, before the external air can flow into the dust removal connection.It is further preferred if the direction of rotation of the dust air wheel and / or the arrangement of the external air inlet is designed such that the external air flowing in via the external air inlet flows from the external air inlet towards the dust removal connection over at least 180 degrees, preferably at least 270 degrees, more preferably at least 300 degrees of a rotation of the dust air wheel about its axis of rotation and / or by at least 180 degrees, preferably at least 270 degrees, more preferably at least 300 degrees, around the axis of rotation of the dust air wheel. It is even more preferred if the external air flowing in via the external air inlet is pre-conveyed to the dust removal connection by a rotation of the dust air wheel by at least 340 degrees, more preferably 350 degrees, and / or flows from the external air inlet towards the dust removal connection by at least 340 degrees, more preferably 350 degrees, around the axis of rotation of the dust air wheel.

[0047] The dust removal connection advantageously protrudes in front of or toward the external air inlet, so that a closure or actuating part of the dust removal device, for example, the dust collection device, can reach in front of the external air inlet when connected to the dust removal connection in order to close the external air inlet. The actuating part serves, for example, to actuate the closure device to close the external air inlet. The closure part preferably serves to close, at least partially close, the external air inlet.

[0048] An advantageous embodiment of the invention provides that the dust removal device, for example the dust collection device, has a closure section for closing the external air inlet. The closure section is designed, for example, as a closure wall.

[0049] The closure section is preferably designed and / or intended to completely hermetically seal the external air inlet when the closure section is arranged at the external air inlet. However, it is also possible for the closure section to cover the external air inlet but not completely hermetically or flow-tightly seal it, i.e., for the closure section to rest against or be arranged at the external air inlet, but for a small amount of external air to still flow into the external air inlet, for example, through a gap or slit between the closure section and the external air inlet.

[0050] Advantageously, the dust removal device, for example the dust collection device, has a plug-in guide, in particular formed by the closure part or encompassing the closure part, and / or a plug-in guide contour and / or an anti-rotation contour, which prevents or at least limits rotation of the dust removal device with respect to a plug-in axis along which the dust removal device can be plugged onto the dust removal connection, and / or which is designed such that the closure part, when the dust removal device is plugged onto the dust removal connection, is opposite the external air inlet and / or closes the external air inlet completely or at least substantially. The plug-in guide or plug-in guide contour or anti-rotation contour ensures, for example, that the closure part is opposite the external air inlet when the dust removal device is arranged on the grinding machine.

[0051] It is advantageous that the dust removal connection is tubular or comprises a removal connection pipe or a removal connection piece or is formed by a removal connection pipe or a removal connection piece

[0052] The dust removal device advantageously has a connecting body for a flow-tight connection to the dust removal connection. The closure section is arranged separately from the connecting body and / or adjacent to the connecting body. The connecting body is, for example, tubular or comprises a connecting pipe. The closure section, however, is located away from the tubular body, i.e., the tubular body itself or the connecting body itself does not close the external air inlet, but the closure section arranged adjacent to the connecting body does.

[0053] If the dust removal device is designed as a dust collection device, it preferably has a first connecting body that is geometrically different from a second connecting body that forms a connecting body for the suction hose. While both connecting bodies, the dust collection device connecting body and the suction hose connecting body, can in principle be tubular or comprise tubular bodies, they can otherwise have different geometries. For example, the tubular body does not have a closure section or actuating section arranged on or next to it, whereas the connecting body of the dust collection container or the dust collection device has an actuating section and / or closure section.

[0054] An advantageous concept provides, for example, that the external air inlet is arranged next to the dust removal connection in such a way that the external air inlet has a larger flow cross-section for the flow of external air when connecting a suction hose connection body or connection body of the suction hose than when connecting a dust collection device connection body or a connection body of the dust collection device.

[0055] The dust collection device is preferably provided and configured to completely close and / or cover the external air inlet. For example, the closure section is configured such that it completely closes or can close the external air inlet. If multiple external air inlets are present, the closure section is advantageously configured to completely close all or several external air inlets. However, several separate closure sections can also be provided on the dust collection device in order to completely or partially close several separate external air inlets individually.

[0056] However, if a suction hose is connected to the dust extraction port, i.e., if vacuuming is intended, it is advantageous if the external air inlet or its flow cross-section remains completely or entirely free for the flow of external air. Advantageously, the dust extraction port and the external air inlet are arranged such that when a cylindrical tubular connector of a suction hose is connected to the dust extraction port, the external air inlet remains open and / or is not covered and / or cannot be covered and / or cannot be closed.

[0057] Thus, the dust removal connection advantageously has two operating modes, namely: Connection of a dust collection device, whereby the external air inlet is then completely closed so that optimal dust removal is ensured, or connection of a suction hose.

[0058] When a suction hose or vacuum cleaner is connected, the external air inlet remains fully or partially open, allowing external air to flow in. This ensures that the suction flow has a flow quality or pressure that prevents the vacuum cleaner from triggering a warning. For example, leaving the external air inlet open when a suction hose is connected ensures that the suction flow passing through the external air inlet does not have such a negative pressure that the vacuum cleaner triggers a warning.

[0059] The closure device advantageously comprises a closure member which is adjustably mounted on the grinding machine or the dust removal device by means of a bearing device between an open position releasing the external air inlet and a closed position at least partially or completely closing the external air inlet. Thus, a dedicated openable and closable closure device is provided to close the at least one external air inlet. If multiple external air inlets are present, they can be closed by a single closure device with a single, e.g., sufficiently large and / or multi-part, closure member. The closure member is, for example, plate-shaped and / or designed as a rotary member or the like. The bearing device can mount the closure member displaceably and / or pivotably or is designed for displaceable and / or pivotable mounting.

[0060] The closure member advantageously has a drive contour or is connected to or coupled to a drive contour that can be actuated by the dust removal device upon connection to the dust removal connection and / or upon removal from the dust removal connection in order to adjust the closure member between the open position and the closed position. In particular, an actuating part is arranged on the dust collection device or on its connecting body, for example, so that the latter can actuate the external air inlet by actuating the closure member. The actuating part engages the drive contour, for example, when the dust removal device is connected to the dust removal connection.

[0061] The dust removal connection is preferably tubular or has a discharge connection pipe or a discharge connection nozzle. It is also possible for the dust removal connection to be formed by a discharge connection nozzle or a discharge connection pipe. The connection nozzle or the connection pipe protrudes, for example, in front of the cover that defines the dust removal chamber.

[0062] The flow direction of external air flowing through the external air inlet and the flow direction of a dust-laden air stream flowing through the dust removal connection preferably run transversely to each other. It is particularly advantageous if the flow directions are at right angles, approximately at right angles, or at an angle between 80 and 120 degrees to each other.

[0063] The machine housing of the grinding machine advantageously has a handle which projects backwards in the opposite direction to a main working direction intended for regular processing of the wall section or a workpiece using the grinding machine.

[0064] The dust removal connection advantageously protrudes in front of the machine housing in the direction of the handle and / or is oriented in the direction of the handle. The longitudinal axes of the handle and the dust removal connection are advantageously parallel to each other or have an angle of less than 30 degrees or less than 20 degrees.

[0065] It is advantageous if the at least one external air inlet is arranged below the handle and / or to the side next to the handle.

[0066] An energy storage device for supplying electrical power to the grinding machine is advantageously arranged or can be arranged on the handle or next to the handle.

[0067] An independent invention in connection with the preamble features of claim 1 represents what can also be considered an advantageous embodiment of the grinding machine and the hand-held power tool described above if the machine housing has a support contour arrangement with at least one support contour on an upper side facing away from or opposite the tool holder for securely placing the grinding machine with its upper side on a surface. The basic idea here is that the grinding machine can be placed on a surface, for example a workpiece surface, not only with the disc tool facing down, but also with its upper side. This makes changing tools, for example, particularly easy.

[0068] The machine housing, for example, has a longitudinal center plane, and the support contour arrangement is designed and provided to securely support the machine housing relative to the longitudinal center plane. For example, the support contour arrangement has a support contour at three spaced-apart locations. At least two of the support contours are preferably spaced transversely relative to the longitudinal center plane. These two support contours, which have a transverse spacing, are preferably spaced longitudinally from one or two support contours arranged on the machine housing in the longitudinal extension of the longitudinal center plane relative to the two aforementioned support contours.

[0069] For example, the machine housing has, as a component of the support contour arrangement, at least one support rib extending transversely to a longitudinal center plane of the machine housing. Such a support rib can therefore have a longitudinal shape. Furthermore, it is advantageous if the support contour arrangement has a support projection spaced transversely from the longitudinal center plane. It is of course advantageous if it has support projections spaced apart from one another on opposite sides of the longitudinal center plane. For example, such a support rib or support projection is arranged on a handle that projects from a drive section of the machine housing in the direction of the longitudinal center plane. The drive motor, for example, is arranged in the drive section.

[0070] The support projection or support rib protrudes, for example, from a rounded or flat surface of the machine housing.

[0071] Furthermore, it is advantageous if the support contour arrangement comprises a grip portion on the top side of the machine housing, which is provided and configured to support the palm of an operator's hand against the machine housing. For example, the grip portion has a spherical shape.

[0072] It is advantageous if a vertical axis of the grinding machine or hand-held power tool extending between the underside and the top side has essentially the same inclination to the surface in a state in which the grinding machine or hand-held power tool rests with its underside on a surface and in a state in which the grinding machine or hand-held power tool rests with its top side on the surface by means of the support contour arrangement, or has inclinations that differ from one another by a maximum of 20°. It is therefore possible for the grinding machine or hand-held power tool to have a slight inclination, for example 10° to 20° or the like, when placed on its top side on the surface. Nevertheless, the grinding machine or hand-held power tool is placed or can be placed on the surface with its top side in a manner that prevents it from tipping over.

[0073] The support contour arrangement is preferably designed such that the support surfaces of all support contours lie in a common support plane. If the grinding machine is placed or supported on a surface forming a flat surface using the support contour arrangement, the support plane corresponds to the flat surface of the surface. The support contour arrangement is designed, for example, such that an energy storage device and / or battery pack arranged on the machine housing and / or a dust removal device arranged on the machine housing, in particular a dust collection container, does not protrude in front of the support plane or is arranged behind the support plane.

[0074] The support contour arrangement is preferably further configured such that the machine housing can be placed on the ground using the support contour arrangement, regardless of whether an energy storage device or battery pack is arranged on the machine housing. Thus, the machine housing is not supported on a ground using an energy storage device or battery pack arranged on the machine housing, but rather using the support contour arrangement.

[0075] Furthermore, it is advantageous if the support contour arrangement is designed in such a way that the machine housing can be placed on a base solely by means of the support contour arrangement, without an energy storage device arranged on the machine housing having contact with the base.

[0076] An embodiment of the invention is explained below with reference to the drawings. They show: Figure 1a perspective oblique view of a hand-held power tool with a dust collection container, Figure 2the oblique view of the hand-held power tool according to Figure 1 , but with a connected suction hose, Figure 3the hand tool according to Figure 2 from below, Figure 4 a side view of the hand-held power tool according to the preceding figures, partially in section, Figure 5 a perspective oblique view of a section through a front part of the hand-held power tool according to Figure 1 , approximately along a section line AA in Figure 1 , Figure 6 a sectional view similar to Figure 5 , but by the hand-held machine tool according to Figure 2 and directly from above, approximately along a section line BB in Figure 2, Figure 7 an exploded view of the hand-held power tool according to the preceding figures, Figure 8 a perspective oblique view of a dust air wheel of the hand-held power tool, Figure 9 a longitudinal section through a front part of the hand-held power tool according to the preceding figures, approximately corresponding to the sectional view according to Figure 4 , Figure 10 a bearing carrier, a motor bearing and a drive motor of the hand-held power tool, Figure 11 a perspective oblique view of a dust collection device with a clamping device for connection to the hand-held power tool, Figure 12 a perspective oblique view of a suction hose with a clamping device for connection to the hand-held power tool, Figure 13 a rear partial view of the hand-held power tool according to the preceding figures with the Figures 11 or 12 shown clamping device of the dust collection container in clamping position (where the dust collection container is otherwise not shown), Figure 14 the view according to Figure 13 with the clamping device in the release position, Figure 15 a variant of the hand-held power tool according to the preceding figures with a closure device for closing an external air inlet, Figure 16 a perspective detailed view of the variant according to Figure 15 , wherein an upper and rear part of the hand-held power tool are not shown, Figure 17 a perspective detailed view from below of a variant of the hand-held power tool with a further locking device, approximately corresponding to a detail D in Figure 15 , Figure 18 a sectional view through the detail according to Figure 17 , approximately along a Figure 6 drawn section line CC, with the locking device in the closed position, Figure 19 the sectional view according to Figure 18 , but with the locking device in the open position, Figure 20the hand-held power tool according to Figure 1with its upper side placed on a base, Figure 21Hand-held machine tool in the position according to Figure 20 , but without energy storage and dust collection container, and Figure 22 the hand-held power tool in the position according to Figure 20 , but from the front and without the dust collection container and a smaller disc tool.

[0077] A hand-held power tool 10 according to the drawing is configured, for example, as a grinding machine 11. The hand-held power tool 10 has a drive motor 12, the output of which rotates about a motor axis M and drives a gear 13, for example, an eccentric gear, oscillation gear, or the like, which in turn drives a tool holder 14 in a rotational and / or eccentric and / or hypercycloidal manner.

[0078] The drive motor 12 is an electric drive motor. The drive motor 12 has, for example, a stator 12A and a rotor 12B.

[0079] The tool holder 14 rotates about a tool axis W or is driven or drivable in rotation about a tool axis W.

[0080] For example, the tool axis W and the motor axis M are eccentric to each other.

[0081] The gear 13 is or comprises, for example, an eccentric gear or eccentric bearing 13A.

[0082] The drive motor 12 and the gear 13 form a drive train 13B or at least parts of a drive train 13B, which is accommodated in a machine housing 15 of the hand-held power tool 10.

[0083] The hand-held power tool 10 is a hand-held power tool, or one that is to be guided or guided manually by an operator. Accordingly, the operator can freely guide the hand-held power tool along a workpiece surface WO, for example, forward in a main working direction HA or backward against the main working direction HA or transverse to the main working direction HA.

[0084] The machine housing 15 has a drive section 16 that houses the drive motor 12 and the transmission 13, thus the drive train. The drive section 16 has, for example, a motor mount 16A for accommodating the drive motor 12.

[0085] A handle section 17, which, for example, has or is formed by a hand rest, is arranged on the drive section 16. The handle section 17 or the hand rest is suitable for gripping with an operator's hand and / or for supporting an operator's hand.

[0086] A handle 18 protrudes from the drive section 16, for example, opposite to the main working direction HA. The handle section 17 and the handle 18 are arranged, for example, on a front section or front side 19 and a rear section or rear side 20 of the machine housing 15 with respect to the main working direction HA.

[0087] The tool holder 14 and / or the tool axis W and / or the motor axis M are located approximately in the region of a longitudinal center plane 23 extending from the front 19 to the rear 20 of the handheld power tool 10. The handle section 17 is arranged on an upper side 24 of the handheld power tool 10, while the tool holder 14 is arranged on a lower side 25 opposite the upper side 24. The lower side 25 is provided for guiding the handheld power tool 10 along the workpiece surface WO or is opposite the workpiece surface WO during operation of the handheld power tool 10.

[0088] The hand-held power tool 10 is preferably a battery-operated or rechargeable hand-held power tool. The concepts explained below regarding dust removal, drive train design, and optimized attachment or a dust collection device could also be readily implemented in a mains-powered hand-held power tool. In this case, the hand-held power tool 10 would have, for example, a connecting cable for connection to a power supply network.

[0089] An energy storage connection 26 for an electrical energy storage device 27, for example a battery pack, is arranged slightly off-center with respect to the longitudinal center plane 23.

[0090] The energy storage connection 26 is provided, for example, on a holding section 26A of the machine housing 15. The holding section 26A extends between the drive section 16 and an end region of the handle 18 remote from the drive section 16.

[0091] A through-opening 18A is provided between the handle 18 and the holding part 26A. A hand grasping the handle 18 can engage the through-opening 18.

[0092] The tool holder 14 is arranged within and / or below a cover 30, which extends from the drive section 16 to the underside 25 of the hand-held power tool 10. The cover 30 defines a dust removal chamber 31, which is provided for collecting and removing dust generated during the machining of the workpiece surface WO.

[0093] For example, a disc tool 90, in particular a grinding tool, can be releasably attached to the tool holder 14. For this purpose, the disc tool 90 has, for example, a drive holder 91. The drive holder 91 and the tool holder 14 comprise, for example, bayonet contours / or rotary drive contours and / or a screw connection or the like.

[0094] The disc tool 90 has a processing surface 92, for example, a grinding surface or polishing surface, wherein the grinding surface can also be formed by an abrasive that can be detachably attached to the disc tool 90. Inlet openings 93 into which air can flow are arranged on the processing surface 92. For example, a dust-laden air stream, i.e., a dust air stream S, can flow through the inlet openings 93 toward the dust removal chamber 31, wherein the dust air stream S can flow out through outlet openings 94, which are fluidly connected to the inlet openings 93, on a mounting side 95 of the disc tool 90 opposite the processing surface 92 and intended for mounting on the handheld power tool 10.

[0095] An annular seal 31A or sealing collar surrounds the dust removal chamber 31. The seal 31A is held, for example, by the machine housing 15 and rests against the mounting side 95 of the disc tool 90. The outlet openings 94 are arranged in an interior space surrounded by the seal 31A.

[0096] It is possible for the dust removal chamber 31 to be vacuumed, for example, using an STA vacuum cleaner. In this case, actively generating a dust air flow by the hand-held power tool 10 is not necessary, but possible.

[0097] In the present case, however, the hand-held power tool 10 or grinding machine 11 has an active generation of the dust air flow or is designed to actively generate the dust air flow. Arranged within the dust removal chamber 31 is a dust air wheel 32, which is driven or drivable by the drive motor 12. For example, the dust air wheel 32 is arranged at the output of the drive motor 12.

[0098] The dust air wheel 32 can support the dust air flow S even when the vacuum cleaner STA is connected to the dust removal connection 33.

[0099] The dust air wheel 32 thus generates a dust air flow S or supports its flow.

[0100] The dust air wheel 32 is rotationally fixedly connected to a motor shaft 12C of the drive motor 12, which represents the output of the drive motor 12. The drive motor 12 or the motor shaft 12C rotates in a direction of rotation DR.

[0101] The dust air wheel 32 rotates in the direction of rotation DR, so that the dust air flow S flows through the dust removal chamber 31 with the direction of rotation DR and flows into the dust removal connection 33.

[0102] The dust air wheel 32 and optionally the vacuum cleaner STA generate an air flow that sucks in particles, dust, or the like, which arise, for example, during the machining of the workpiece surface WO, through the inlet openings 93 of the disc tool 90. The dust air flow S thus generated flows from the outlet openings 94 into the dust removal chamber 31, where the dust air wheel 32 conveys it further toward the dust removal connection 33.

[0103] The dust removal connection 33 is designed, for example, as a removal connection pipe 34 or a removal connection nozzle 35 or has a connection pipe 34 or a connection nozzle 35.

[0104] The dust removal connection 33 is preferably arranged approximately tangentially with respect to the dust air wheel 32.

[0105] The dust removal connection 33 is advantageously arranged off-center with respect to the longitudinal center plane 23, for example close to the longitudinal side 23. Thus, the dust air or the dust air flow S flows out of the dust removal chamber 31 eccentrically to the tool axis W and tangentially to the same.

[0106] A dust removal device 50 can be connected to the dust removal connection 33.

[0107] In principle, the hand-held power tool 10 or grinding machine 11 can also be operated without a dust removal device 50, in which case the dust air flow S is blown out into the environment via the dust removal connection 33.

[0108] The dust removal device 50 is, for example, a dust removal device 50A in the form of a suction hose 70A or a dust removal device 50B in the case of a dust collection device 70.

[0109] Both dust removal devices 50A and 50B can collect dust flowing through the dust removal port 33. For example, the STA vacuum cleaner can collect dust. Furthermore, the dust collection device 70 can collect dust.

[0110] Both dust removal devices 50A and 50B can be selectively connected to the dust removal connection 33 and, for this purpose, have a tubular connecting body 51A or 51B. The connecting bodies 51A or 51B can be plugged onto the dust removal connection 33, for example, the removal connection pipe 34, along a plug-in axis ST or removed from the dust removal connection 33 by a pulling movement.

[0111] Both dust removal devices 50A and 50B are sometimes also generally referred to as dust removal device 50 in the following description.

[0112] The connecting bodies 51A, 51B are also generally referred to as connecting bodies 51, in particular when the same or similar components are present in both dust removal devices 50A, 50B or connecting bodies 51A, 51B.

[0113] The connecting bodies 51A and 51B are equipped with clamping devices 52 with which the dust removal devices 50A and 50B can be clamped to the dust removal connection 33.

[0114] The connector body 51A also has a Figures 2 and 3 The variant shown is possible, which does not require a clamping device 52. In particular, this embodiment without a clamping device 52 is optionally conceivable if the following optional measure provides a form-fitting contour on the tubular connecting body 51A.

[0115] In addition, as an optional measure, at least one form-locking contour 56A is provided, which projects radially inward into the connecting body 51A or 51B and can engage with at least one counter form-locking contour 36 on the connecting pipe 34 or connecting piece 35.

[0116] For example, one, two, or more form-locking contours 56A can be provided on opposite sides and / or at an angular distance relative to a longitudinal extension or longitudinal extension axis of the connecting body 51A or 51B. Two form-locking contours 56A are shown schematically for the connecting body 51B by way of example, whereby the angular position and / or the longitudinal distance relative to the insertion axis ST of the form-locking contours 56A relative to one another is only shown schematically and is to be understood as an example. In particular, the form-locking contour 56A on the right in the drawing is shown near the gap or slot 54B so that it is visible.

[0117] The at least one counter-form-locking contour 36 is arranged radially outside a flow cross-section of the dust removal connection 33. For example, the counter-form-locking contour 36 is designed as an arrangement of form-locking receptacles and / or form-locking projections or the like and / or comprises such an arrangement. The at least one counter-form-locking contour 36 comprises, for example, ribs, projections, or the like that protrude from an outer peripheral wall surface of the dust removal connection 33.

[0118] The at least one form-locking contour 56A comprises, for example, one or more form-locking projections 56V. The at least one form-locking contour 56A and / or the form-locking projections 56V protrude or protrude, for example, in front of an inner circumferential wall surface 51W of the connecting body 51.

[0119] The inner peripheral wall surface 51W is configured, for example, as a substantially round inner wall surface. The inner peripheral wall surface 51B, for example, delimits the receiving cross-section 55.

[0120] The at least one counter-form-locking contour 36 comprises, for example, a recess 36V and the form-locking contour 56A comprises, for example, a form-locking projection 56V for engaging in the recess 36V.

[0121] When the at least one form-locking contour 56A engages with the at least one counter-form-locking contour 36, the dust removal device 50 is fixed in a tensile-resistant manner, for example, opposite to the plug-in axis ST, along which the dust removal device 50 can be plugged onto the dust removal connection 33.

[0122] The at least one form-locking contour 56A and the at least one counter-form-locking contour 36 advantageously form an anti-twist device, in particular in conjunction with a form-locking contour 56B, which will be explained in more detail below and which, in the case of the dust collection device 70, is provided on its connecting body or close to its connecting body 51B.

[0123] The clamping device 52 enables the dust removal device 50 to be held particularly well on the dust removal connection 33. The clamping device 52 is adjustable between a clamping position KS, in which a receiving cross-section 55 of the connection body 51 is narrowed, and a release position FS, in which the receiving cross-section 55 is so large that the dust removal device 50 can be removed from the dust removal connection 33 along the plug-in axis ST.

[0124] Advantageously, the receiving cross-section 55 in the release position FS is so large that the form-locking contour 56A can also disengage from the counter-form-locking contour or the counter-form-locking contours 36. The form-locking contour 56A is designed, for example, as a form-locking projection that protrudes into the receiving cross-section 55.

[0125] The form-locking contour 56A comprises transverse form-locking contours 56Q running transversely to the plug-in axis ST. The counter-form-locking contours 36 comprise transverse counter-form-locking contours 36Q running transversely to the plug-in axis ST. When the dust removal connection 33 engages in the connection body 51A or 51B and the transverse form-locking contours 56Q and the transverse counter-form-locking contours 36Q engage with each other, the connection body 51A, 51B is held tensile-resistant to the dust removal connection 33 with respect to the plug-in axis ST.

[0126] The form-locking contour 56A also comprises longitudinal form-locking contours 56L running with a directional component to the plug-in axis ST parallel or exactly parallel to the plug-in axis ST. The corresponding counter-form-locking contour 36 comprises longitudinal counter-form-locking contours 36L running with a directional component to the plug-in axis ST parallel or exactly parallel to the plug-in axis ST. When the dust removal connection 33 engages in the connecting body 51A or 51B and the longitudinal form-locking contours 56L and the longitudinal counter-form-locking contours 36L engage with one another, the connecting body 51A, 51B is held on the dust removal connection 33 in a rotationally secure manner with respect to rotation about the plug-in axis ST.

[0127] The longitudinal counter-form-locking contours 36L and the transverse counter-form-locking contours 36Q, for example, delimit the at least one recess 36V. Preferably, a plurality of recesses 36V are provided, which advantageously have a longitudinal distance relative to the plug-in axis ST, which essentially corresponds to a longitudinal axis of the dust removal connection 33, and / or an angular distance relative to the plug-in axis ST.

[0128] It is also possible that in the release position FS the receiving cross-section 55 is so large that the form-locking contour 56A is rotatable relative to the at least one form-locking contour 56, so that the form-locking contours 56 and 56A can be brought into a rotational position such that they can be displaced past one another along the plug-in axis ST.

[0129] The clamping device 52 has a clamp 53.

[0130] The clamp 53 can be formed, for example, by sections of the connecting body 51A or 51B.

[0131] The clamp 53 can also be a clamp surrounding the connecting body 51A or 51B and separate from the connecting body 51A or 51B, for example in the form of a clamping clip, in a manner not shown.

[0132] The clamp 53 has, for example, clamping legs 54 which, in a position moved towards each other, narrow the receiving cross-section 55 and, in a position moved away from each other, enlarge the receiving cross-section 55.

[0133] Free end regions 54C of the clamping legs 54 are opposite one another, wherein a slot or gap 54B is formed between the end regions 54C, which is smaller in the clamping position KS than in the release position FS.

[0134] An actuating element 57X in the form of a pivot lever 57 serves to actuate the clamping device 52. The pivot lever 57 is pivotably mounted about a pivot axis SA on the connecting body 51 or close to the connecting body 51 by means of a pivot bearing 57A.

[0135] Advantageously, the pivot axis SA is parallel or substantially parallel, i.e. deviating at an angle of maximum 5°, to the plug-in axis ST.

[0136] For example, the pivot bearing 57A has one or more axle bodies 57B that engage with bearing receptacles 57C of the pivot lever 57.

[0137] Thus, the pivot lever 57 is pivotably mounted on the axle body 57B about the pivot axis SA by means of the bearing mounts 57C.

[0138] The pivot lever 57 has a pivot arm 57D that can be grasped by an operator and projects from the pivot bearing 57A. The pivot arm 57D has an actuating contour 57E in the area of the pivot bearing 57A, for example, close to the bearing receptacle 57C. The actuating contour 57E includes an eccentric contour 57F that runs eccentrically to the pivot axis SA. Thus, when the pivot lever 57 is adjusted between a release actuation position FB assigned to the release position FS, in which the pivot lever 57 protrudes from the connecting body 57, into a clamping actuation position KB assigned to the clamping position KS, sections of the eccentric actuation contours 57B that are increasingly eccentrically spaced further from the pivot axis SA engage with a support section of the connecting body 51 provided for supporting the actuation contours 57B in order to actuate and / or linearly adjust a tie rod 58.The support part of the connecting body 51 is provided, for example, on the outer circumference of the connecting body 51 or the pipe body or is formed by this outer circumference.

[0139] The tie rod 58 passes through the two clamps 53 in the area of the free end portions of the clamping legs 54. The tie rod 58 has, for example, a bolt portion 58A extending between a support head 58B and a driving head 58C. The bolt portion 58A passes through openings 54A at the free end portions of the clamping legs 54.

[0140] The support head 58B rests on the outside of the clamping leg 54, which is further away from the pivot lever 57. The driving head 58C rests near the pivot lever 57 on the axle body 57B, which has a receptacle 571 penetrated by the bolt portion 58A.

[0141] Thus, when the eccentric contour 57C rests on the connecting body 51 upon actuation of the pivot lever 57 from the release actuation position FB to the clamping actuation position KB, a tensile force ZK acts on the tie rod 58, which actuates the support head 58B in the direction of the pivot lever 57, thereby narrowing the receiving cross-section 55 so that the connecting body 51A or 51B clamps to the dust removal connection 33, for example, the outer circumference of the connecting pipe 34. This ensures an optimal clamp fit and hold of the respective dust removal device 50A, 50B on the dust removal connection 33.

[0142] When the clamping device 52 is moved from the clamping position KS to the release position FS, it is an option for the tie rod 58, for example, to act as a thrust element, for example by means of the support head 58B. If the support head 58B or a driving contour arranged close to it drives the clamping leg 54, on which the support head 58B is arranged, from the other clamping leg 54, which is close to the driving head 58C, the two clamping legs 54 are moved away from each other in the sense of an enlargement of the receiving cross-section 55, for example by a thrust force SK.

[0143] Alternatively or in addition to actuating the clamping device 52 from the clamping position KS toward the release position FS, a spring device 57J can also be provided, for example, an elastic block-shaped body, a coil spring, or the like. The spring device 57J is arranged, for example, between the clamping legs 54 or their free end regions and is supported on the clamping legs 54. The spring device 57J is penetrated, for example, by the bolt portion 58A of the tension rod 58.

[0144] The pivot arm 57C has a receiving contour 57G, for example, a trough-like depression, into which the connecting body 51 engages in the clamping actuation position KB and / or in which the connecting body 51 is received in the clamping actuation position KB. Thus, the pivot arm 57D nestles, so to speak, against the connecting body or its tubular shape. However, in the clamping actuation position KB, a grip projection 57H suitable for gripping by an operator protrudes from the connecting body 51, so that the operator can conveniently grasp the pivot lever 57 by the grip projection 57H for actuation and / or pivoting in the direction of the release actuation position FB.

[0145] The connecting body 51B of the dust collection device 70 is arranged on a support body 71, which serves to support a dust collection container 75. The dust collection container 75 is held on a further support body 72. The support bodies 71, 72 are adjustable relative to one another, for example, pivotally mounted on one another, for example by means of a pivot bearing 73. Both support bodies 71 and 72 have through-openings 71A and 72A for the dust air flow S, wherein the through-opening 71A of the support body 71 is fluidly connected to the connecting body 51. When the support bodies 71, 72 are adjusted away from one another, the through-opening 72A of the dust collection container 75, which is significantly larger than the through-opening 71A, is exposed, through which the dust collection container 75 can be emptied. The support body 71 thus forms, for example, a cover for the passage opening 72A of the support body 72.

[0146] However, it is also possible to remove the dust collection device 70 for emptying from the dust removal connection 33, so that dust retained in the dust collection container 75 can be emptied through the connection body 51B.

[0147] The support bodies 71, 72 can be fixed to one another using a fixing device 74, for example, a clamping device, locking device, or the like, so that they lie flat against one another and a flow connection is established between the connecting body 51 and the dust collection container 75, but the passage opening 72A is closed. The fixing device 74 can also be referred to as a support body fixing device. Accordingly, the clamping device or locking device can be a support body clamping device or a support body locking device.

[0148] The dust collection container 75 has a cubic or block-shaped configuration. For example, the dust collection container 75 has opposing side walls 75A, 75B, which can form, for example, upper and lower side walls. Longitudinal side walls 75C extend between the side walls 75A, 75B. The support body 72 is arranged, for example, on a front wall 75D. On a side facing away from the support body 72, the dust collection container 75 is delimited or closed by a rear wall 75E. The rear wall 75E can, for example, have sections 75F and 75G that are angled to one another. Thus, apart from the opening in the support body 72 or the connecting body 51, there is no opening in the dust collection container 75.

[0149] The dust collection container 75 preferably consists of a filter material, for example textile material or the like.

[0150] A support body 77, for example made of wire or the like, serves to hold the dust collection container 75 in an open or elongated shape. The support body 77 is preferably arranged in the interior of the dust collection container 75. Support body sections of the support body 77 are preferably located approximately in the region of the inner edges of the dust collection container 75. The dust collection container 75 is advantageously clamped by the support body 77.

[0151] The support body 77 is held on the support body 72 and extends away from it with a support body longitudinal section 77A.

[0152] In the area of the rear wall 75D, a support body transverse section 77B of the support body 77 is provided, which protrudes from the support body longitudinal section 77A. The support body 72 and the support body transverse section 77B, together with the support body longitudinal section 77A connecting the two components, form a U-shaped configuration. A support body section 77C protrudes from the support body transverse section 77B to the side wall 75B and is connected to the support body 72 by means of a support body section 77D and a support body section 77E. The support body sections 77B and 77D run approximately parallel to one another, as do the support body sections 77A and 77D. For example, the support body sections 77A and 77B as well as the support body sections 77D and 77E are approximately L-shaped.

[0153] No element of the support body 77 is provided on the side of the dust collection container 75 associated with the handle 18, so that an operator, when gripping the handle 18 and / or attaching or removing the energy storage device 27 to the energy storage connection 26, can, so to speak, engage in a soft section 75M of the dust collection container 75 without the support body 77 being in the way.

[0154] The dust collection device 70 can be easily connected to the dust removal connection 33 by providing a plug-in guide 80 and / or an anti-rotation contour 81 to guide and hold the dust collection device 70 in a rotation-proof manner with respect to the plug-in axis ST on the dust removal connection 33.

[0155] The plug-in guide 80 comprises a plug-in guide contour 80A. The plug-in guide contour 80A and the anti-rotation contour 81 are arranged on the dust collection device 70, in particular on its connecting body 51B.

[0156] A plug-in guide contour 80B interacting with the plug-in guide contour 80A and an anti-rotation contour 81B interacting with the anti-rotation contour 81 are arranged on the dust removal connection 33. For example, the plug-in guide contour 80B and the anti-rotation contour 81B are formed by an end face or end wall surrounding the external air inlet 40.

[0157] In the case of the suction hose 70A, a firm grip achievable by means of the clamping device 52 enables, for example, an operator to grasp the suction hose 70A, which is connected to the connecting body 51A, if necessary, in order to move the grinding machine 11 along the workpiece surface WO. The suction hose 70A has the connecting body 51A at one longitudinal end and a connecting body 51C at an opposite longitudinal end for connection to the vacuum cleaner STA.

[0158] In the case of the dust collection device 70, the clamping fit of the connecting body 51B on the dust removal connection 33 also proves advantageous because it allows for a quick change or replacement of the dust collection device 70. In particular, this also allows the dust removal device 50B to simultaneously close an external air inlet 40, explained below, which remains open when the dust removal device 50A or the suction hose 70A is connected.

[0159] The external air inlet 40 is arranged next to the dust removal connection 33 and close to the dust removal connection 33 and allows external air F to flow into the dust removal chamber 31. The external air inlet 40 is therefore arranged on the rear side 20 of the machine housing 50 as seen with respect to the main working direction HA.

[0160] An external air duct 40A extends along the rear side 20 of the machine housing 50 and / or the rear side of the dust removal chamber 31, at which the external air inlet 40 is located. The external air inlet 40 and an inlet opening 40B for the flow of external air F into a receiving chamber 32A, in which the dust air wheel 32 is located, are fluidly connected to one another via the external air duct 40A.

[0161] External air F flowing in through the external air inlet 40 flows through the external air duct 40A and flows into the dust removal chamber 31 via the inlet opening 40B.

[0162] The external air duct 40A advantageously extends substantially over the entire transverse width or at least 50% or 60% of the transverse width of the dust removal chamber 31 and / or the machine housing 15 in the region of the dust removal chamber 31 transversely to the longitudinal center plane 23.

[0163] While the dust removal connection 33 runs parallel or with an inclination of less than 30° degrees, preferably less than 20° degrees, even more preferably less than 10° degrees / to the longitudinal center plane 23, the external air inlet 40 runs transversely to the longitudinal center plane 23, for example approximately at a right angle transversely.

[0164] The arrangement of the external air inlet 40 is advantageously such that the external air F flowing into the external air inlet 40 flows through the dust removal chamber 31 in an almost completely rotary manner, picking up dust and particles, before flowing into the dust removal connection 33 as a dust air stream S. In any case, the dust air wheel 32 can convey the external air F flowing in through the external air inlet 40 through the almost complete dust removal chamber 31, namely in a rotary movement or flow movement flowing around the tool axis W, before the dust exhaust air stream S flows out of the dust removal chamber 31 through the dust removal connection 33.

[0165] A flow of external air F through the external air inlet 40 is particularly desirable when the suction hose 70A and thus the vacuum cleaner STA is connected. This avoids an undesirable negative pressure situation, i.e., a sufficient dust air flow S can always flow through the dust removal connection 33 without the vacuum cleaner STA or a flow measuring device or pressure measuring device present there detecting an excessive negative pressure, which would lead to the vacuum cleaner STA being switched off. If the vacuum cleaner STA delivers an insufficient dust air flow S, there is a risk that dust could enter the area around the hand-held power tool 10 or grinding machine 11 to an unacceptable extent. The vacuum cleaner STA should therefore be able to generate the dust air flow S as constantly as possible.

[0166] If, however, the dust collection device 70 is connected to the dust removal connection 33, the external air F flowing into the external air inlet 40 would reduce the conveying capacity of the dust air wheel 32, so that the dust air flow S could be too low. Therefore, it is advantageous to completely or at least partially close the external air inlet 40 when the dust collection device 70 is arranged at the dust removal connection 33.

[0167] The dust collection device 70 has a closure section 42A, which serves to close the external air inlet 40 and forms a component of a closure device 41A. The closure section 42A can, in principle, be provided and designed to completely and / or hermetically close the external air inlet 40. However, it is also possible for the closure section 42A to cover the external air inlet 40 but not completely or hermetically close it. Thus, a small amount of external air can flow in through the external air inlet 40, even if the external air inlet 40 is covered by the closure section 42A. For example, a narrow slot can be present between an outer circumference of the closure section 42A and a contour or wall of the external air inlet 40 running alongside the closure section 42A, through which external air can still flow into the external air inlet 40, albeit only a small amount.

[0168] The plug-in guide contour 80A and / or the anti-rotation contour 81 of the dust collection device 70 are advantageously formed or provided by the closure part 42A or are arranged on the closure part 42A. It is also possible for the closure part 42A to form the plug-in guide contour 80A and / or the anti-rotation contour 81.

[0169] When the dust collection device 70 is connected to the dust removal connection 33, the external air inlet 40 should be closed. The closure section 42A already reaches the external air inlet 40 when the dust collection device 70 is connected to the dust removal connection 33 and closes it.

[0170] The closure section 42A, for example, has a wall-like shape and closes the external air inlet 40 when the dust collection device 70 is attached to the dust removal connection 33. At the same time, the closure section 42A forms the previously indicated positive locking contour 56B, which represents the anti-rotation contour 81 or positive locking contour acting at least with respect to rotation relative to the plug-in axis ST. Thus, the plug-in guide contour 80B at the external air inlet 40 forms a counter positive locking contour 36B for the positive locking contour 56B.

[0171] However, it is also advantageous, both in the embodiments illustrated in the drawings and in any grinding machine according to the invention, if a closure device for closing an external air inlet can be used independently of the connection of a dust collection container and / or if a closure device enables adjustment of the flow cross-section of the external air inlet, for example, by providing a type of control valve or comprising a control valve. With such a closure device, the external air inlet can not only be fully opened or fully closed, but also assume intermediate positions between an open position and a closed position.

[0172] Such greater flexibility with regard to closing an external air inlet is offered by a closure device 41B, which serves to close an external air inlet 140. The external air inlet 140, like the external air inlet 40, is arranged on the rear side 20 of the grinding machine 11. However, the external air inlet 140 extends approximately across a transverse width of the rear side 20 and penetrates the longitudinal center plane 23. The external air inlet 140 is open towards the underside 25 and / or in an orientation towards the machining surface 92 of the disk tool 90, and can therefore suck dust from the surroundings of the hand-held power tool 10 and the grinding machine 11 into the dust removal chamber 31. If, for example, dust remains on the workpiece surface WO when the grinding machine 11 is guided in the main working direction HA, this dust can be sucked in via the external air inlet 140. So there is a kind of "vacuum cleaner function" here.

[0173] The external air inlet 140 can also be closed if necessary, for example, when using the dust collection device 70. For this purpose, a closure device 41B is provided, which has a closure member 42B suitable for closing the external air inlet 140 or for opening it. The closure member 42B is designed, for example, in the manner of a roller or formed by a rotating body 43. The closure member 42B is arranged next to the external air duct 40A or arranged on the external air duct 40A. Advantageously, the closure member 42B extends approximately over the entire longitudinal extent of the external air duct 40A.

[0174] The closure member 42B or the rotating body 43 is rotatably mounted on a bearing holder 44 of the machine housing 15, wherein it or it is adjustable between an open position OP, in which the external air inlet 140 is open, and a closed position SP, in which the external air inlet 140 is closed.

[0175] The closure member 42B has, for example, a cylindrical peripheral wall or closure wall 42C, which can be adjusted by rotating the closure member 42B in front of the inlet opening 40B, through which the external air F can flow into the receiving chamber 32A, wherein the closure wall 42C then closes the inlet opening 40B, and can be adjusted away from the inlet opening 40B, so that the inlet opening 40B is free for the flow of external air F. Intermediate positions of the closure member 42B are possible, in which the closure wall 42C only partially closes the inlet opening 40B.

[0176] When the closure member 42B is in the open position OP, external air F can flow through the closure member 42B through an inlet opening 42D and an outlet opening 42E. In this open position OP, the inlet opening 42D is opposite the external air duct 40A, and the outlet opening 42E is opposite the inlet opening 40B.

[0177] It should be mentioned that the closure member 42B can also assume, for example, intermediate positions between its open position OP and its closed position SP, so that the amount of external air F flowing through the external air inlet 140 can be adjusted.

[0178] The closure member 42B can also be referred to or viewed as a valve member of a control valve.

[0179] To actuate the rotating body 43 or the closure member 42B, an actuating element 45 configured in the manner of a handle can be provided, for example. The actuating element 45 has, for example, an actuating projection 45A that can be clamped with two fingers of an operator.

[0180] As an alternative to the actuating element 45, an actuating element 46 intended for actuation with a tool or auxiliary means may also be provided on the closure member 42B. The actuating element 46 has a slot 46A, which can be actuated, for example, with a screwdriver, a coin, or the like, in order to adjust the closure member 42B between its closed position SP and its open position OP.

[0181] The actuating elements 45 or 46 are preferably provided on an end face of the closure member 42B which is remote from the axis of rotation of the closure member 42B.

[0182] A further alternative for actuating the closure member 42B is a schematically illustrated motorized and / or electric and / or electrically driven actuator 47, for example, an electric motor, an electromagnet, or the like. The actuator 47 can be actuated or controlled, for example, using an electrical switch and / or a sensor 48. The sensor 48 is connected, for example, to a controller 120 of the hand-held power tool 10, which generates control commands, in particular for the actuator 47, based on signals from the sensor 48.

[0183] The sensor 48 detects, for example, the presence of the dust collection device 70 at the dust removal connection 33. Thus, if, for example, the dust collection device 70 is plugged into the dust removal connection 33, the sensor 48 can detect this and control the actuator 47 to move the closure member 42B into its closed position SP. The sensor 48 is, for example, a pressure sensor, an electrical switch, a proximity sensor, or the like. Of course, an RFID sensor, a magnet, a Hall sensor, an optical sensor, or the like can also be provided.

[0184] Furthermore, it is conceivable for a schematically illustrated actuating element 49, for example an actuating projection, to protrude from the closure member 42B, which can be actuated when the dust collection device 70 is connected to the dust removal connection 33 in order to actuate the closure member 42B toward its closed position SP. For example, a type of driving fork, into which a driving projection on the dust collection device 70 engages, is possible as the actuating element 49. Thus, it is also possible for the dust collection device 70 to carry the closure device 41B or the closure member 42B toward the open position OP when it is removed from the dust removal connection 33.

[0185] The closure member 42B, particularly in its capacity as a valve member, can also readily be configured in both embodiments according to Figure 10be used, where it is schematically shown in the external air duct 40A. The closure member 42B is rotatably received, for example, in a bearing receptacle which, for example, has an inlet opening similar to the inlet opening 40B or is fluidly connected to such an inlet opening. Thus, the closure member 42B could be provided and designed, for example, to variably adjust the external air flow within the external air duct 40A. In addition, the external air duct 40A, in particular the external air inlet 40, can optionally be completely or essentially completely closed by the closure section 42A of the dust collection device 70. Thus, for example, when the hand-held power tool 10 is operated without the dust collection device 70, the external air flow can be variably adjusted using the closure member 42B, while it is completely or partially prevented with the dust collection device 70.

[0186] At this point, it should be mentioned that, for example, a smaller closure surface of the closure section 42A is suitable for only partially closing the external air inlet 40 when the dust collection device 70 is arranged on the hand-held power tool 10. Furthermore, it is possible for the closure section 42A to be movably mounted on the dust collection device 70, for example by means of a schematically illustrated bearing 42L, in particular a sliding bearing and / or pivot bearing. For example, the closure section 42A can be adjusted upwards into a position shown in dashed lines, in which it only partially closes the external air inlet 40 when the dust collection device 70 is arranged on the hand-held power tool 10.Advantageously, the closure part 42A can also be adjusted into intermediate positions between the position shown in dashed lines and the position shown in solid lines and / or into a position that further releases the external air inlet 40.

[0187] Placing the grinding machine 11 or hand-held power tool 10 on its upper side 24 is very easy, regardless of whether the dust collection device 70 is attached to the dust removal connection 33 or not. In both situations, the grinding machine 11 can be placed and supported with its upper side 24, for example, on the workpiece surface WO, without tipping sideways, for example, toward one of the long sides 21 or 22.

[0188] A support contour arrangement 28 is provided for this purpose. The support contour arrangement 28 comprises the handle section 17 and a support contour, for example a projection 29, arranged on the free end region of the energy storage connection 26 or the handle 18. The projection 29 is provided at a transverse distance from the longitudinal center plane 23. Thus, when the grinding machine 11 or hand-held power tool 10 with the dust collection device 70, when attached to the dust removal connection 33, is placed on its upper side 24 on the base, for example the workpiece surface WO, it is supported on the base or the workpiece surface WO by the handle section 17, the support contour or the projection 29, and a support contour 29A provided on an edge between the rear wall 75D and the side wall 75A of the dust collection container 75.

[0189] However, if the dust collection device 70 is removed from the dust removal connection 33, it is also possible to place or set down the machine housing 15 with its upper side 24 on the ground or the workpiece surface WO in a tilt-proof manner. The hand-held power tool 10 and / or the machine housing 15 then rests, for example, with the support contour 29, the handle section 17, and a support contour 29B at the free end region of the handle 18 on the ground or the workpiece surface WO.

[0190] The support contour pairs 29, 29B or 29, 29A are arranged on opposite sides of the longitudinal center plane 23 and also have a longitudinal distance with respect to the handle section 17, so that a stable three-point support of the hand-held power tool 10 or grinding machine 11 with and without the dust collection device 70 arranged on the machine housing 15 on the substrate or workpiece surface WO is always possible.

[0191] A bearing support 150 is provided to close the motor mount 16A or the motor mount space 16C providing the motor mount 16A. The bearing support 150 forms a cover 150A.

[0192] The bearing support 150 is designed, for example, as a wall body 157 or has a wall body 157.

[0193] The bearing support 150 or wall body 157 has, for example, a wall section or a wall 151 which closes the motor mount 16A or the motor mount space 16C.

[0194] The rotor 12B of the drive motor 12 is arranged on the motor shaft 12C. The motor shaft 12C is rotatably mounted relative to the machine housing 15 on a motor bearing 12D and a motor bearing 12E.

[0195] The motor bearing 12D and the motor bearing 12E are arranged on opposite sides of the rotor 12B or the motor shaft 12C.

[0196] A bearing mount 16B for the motor mount 12D is arranged in the region of the upper side 24 of the machine housing 15 and / or on a side of the machine housing 15 opposite the tool holder 14. The bearing mount 16B is arranged, for example, on the motor mount 16A.

[0197] The motor bearing 12E is held on a bearing mount 155 of the bearing support 150. The bearing support 150 and / or the wall body 157 forms a support structure 160 that supports the bearing mount 155. The support structure 160 extends with a directional component parallel to the motor axis M in the direction of the tool holder 14.

[0198] The bearing mount 155 is arranged approximately centrally on the bearing support 150 or the wall 151. An annular bearing retaining element 156, for example made of steel or the like, is arranged in the bearing mount 155, which receives the motor mount 12E. It would be readily possible to support the motor mount 12E directly on the bearing mount 155, i.e., without the bearing retaining element 156 being present.

[0199] Around the bearing support 155, the bearing support 150 has screw openings 152 through which screws 153 can be inserted, which can be screwed into the machine housing 17. These screws 153, as well as form-fitting contours on the bearing support 150, which engage in a form-fitting manner with matching form-fitting contours of the machine housing 15, hold the bearing support 150 stationary relative to the machine housing 15. Thus, the motor bearing 12E is also stationary relative to the machine housing 15.

[0200] The screw openings 152 are arranged relatively close to the motor axis M. For example, the screw openings 152 are spaced from an outer circumference 161 of the bearing carrier 150 by an outer radial distance RA and from an inner circumference 162 of the bearing support 155 by an inner radial distance RI. It can be seen that the radial distances RA and RI differ only slightly from each other, for example, a maximum of 20% or 30% or at most 40%.

[0201] The bearing support 150 has a channel section 154 on a side facing the rear side 20 of the machine housing 15, in which the external air channel 40A is formed.

[0202] Furthermore, the receiving chamber 32A for the dust air wheel 32 is provided on a side of the bearing carrier 150 facing away from the motor receiving space 16C.

[0203] The wall 151 is, for example, curved or dome-shaped, so that it forms a bearing carrier receiving space 158 which forms the receiving chamber 32A and / or is suitable for receiving the dust air wheel 32.

[0204] The bearing support receiving space 158 or the receiving chamber 32A for the dust air wheel 32 is fluidly connected to the dust discharge connection 33. For example, the receiving chamber 32A is fluidly connected to the discharge connection pipe 34.

[0205] The bearing support 150 is made, for example, of metal or another solid or rigid material. Thus, the bearing support 150 can, for example, have receptacles 159 for supporting a protective body 38. The receptacles 159 are arranged, for example, on the outer circumference of the wall 151.

[0206] For example, locking projections 38A of the protective body 38 can engage into the receptacles 159. For example, the receptacles 159 comprise locking receptacles 159A for the locking projections 38A and / or, in particular, grooves 159B extending annularly around the motor axis M, into which annular retaining projections or retaining contours 38B of the protective body 38 can engage and engage when the protective body 38 is mounted on the bearing carrier 150.

[0207] The Figure 4 schematically indicated and in Figure 7The protective body 38, shown somewhat reduced in size, serves to protect a radial outer circumference of the plate tool 90, for example a cushion of the plate tool 90. The protective body 38 protects the plate tool 90, in particular when working in inner corner areas, if narrow sides or peripheral sides of the plate tool 90 would strike against an obstacle. The protective body 38 then strikes this obstacle, so that the plate tool 90, which is arranged behind the protective body 38 with respect to the obstacle, is not damaged. The protective body 38 is designed, for example, in the manner of an annular or partially annular peripheral wall, an apron or the like.

[0208] The motor bearings 12D and 12E are preferably rolling bearings, in particular roller bearings or ball bearings.

[0209] Near the motor bearing 12E, the motor shaft 12C has a receiving element 12F, which is connected to the motor shaft 12C in a rotationally fixed manner or can be integral with the motor shaft 12C. The motor bearing 12E is designed, for example, to support the motor shaft 12C and / or the receiving element 12F and / or to mount it rotatably with respect to the motor axis M.

[0210] The receiving element 12F has a receptacle 12G in which the gear 13, for example in the form of the eccentric bearing 13A, is received. The eccentric bearing 13A or gear 13 is held by a holding body 12H, which is screwed to the receiving element 12F, for example by means of screws 121.

[0211] The eccentric bearing 13C is, for example, a rolling bearing, in particular a ball bearing or roller bearing. The eccentric bearing 13C is eccentric with respect to the motor axis M, with the tool axis W having an eccentric distance e from the motor axis M.

[0212] The tool holder 14, for example a bolt section 14C of the tool holder 14, is received, for example, on a holder 13B of the eccentric bearing 13A or gear 13, in particular in a press fit and / or by means of an adhesive bond and / or the like.

[0213] The tool holder 14 is designed for rotationally driving the plate tool 90 with respect to the tool axis W. The tool holder 14 comprises, for example, a rotationally driving section 14A, on the outer circumference of which a rotationally driving contour 14B is arranged. The rotationally driving contour 14B fits positively into a rotationally driving contour 96 on the drive holder 91 of the plate tool 90, so that the rotationally driving contours 14B and 96 as a whole can connect the plate tool 90 to the holding body 12H in a rotationally fixed manner with respect to the tool axis W.

[0214] Furthermore, the tool holder 14 has a screw holder 14D into which a fastening screw 98, which can be pushed through a through opening 99 of the plate tool 90, can be screwed, so that the plate tool 90 can be connected or is connected to the tool holder 14 in a tensile manner with respect to the tool axis W.

[0215] A cooling air wheel 60 is arranged between the dust air wheel 32 and the drive motor 12.

[0216] The cooling air wheel 60 is arranged between the drive motor 12 and the bearing carrier 150.

[0217] The bearing support 150 separates the dust removal chamber 31 from the motor housing chamber 16C. The bearing support 150 may also be referred to as a bulkhead or may have a bulkhead that separates the dust removal chamber 31 from the motor housing chamber 16C or separates the dust removal chamber 31 from the further interior of the machine housing 15.

[0218] The cooling air wheel 60 is connected to the motor shaft 12C in a rotationally fixed manner. The cooling air wheel 60 serves to generate a cooling air flow K, which flows into the machine housing 15 via inlet openings 15A, flows through the motor receiving space 16C, flows around and / or through the drive motor 12, and then flows out of the machine housing 15 via outlet openings 15B.

[0219] The inlet openings 15A are advantageously arranged apart and away from the tool holder 14 and thus from the plate tool 90, for example at the longitudinal end region of the handle 18.

[0220] The outflow openings 15B are advantageously arranged on the front side 19 of the machine housing 15 above the dust removal chamber 31 and / or in an outflow direction approximately corresponding to the main working direction HA, so that dust lying on the workpiece surface WO in the main working direction HA can be blown away by the cooling air flow K.

[0221] Advantageously, outlet openings 15B are also provided transversely to the main working direction HA. This measure advantageously reduces the flow resistance for the cooling air flow K and / or enables better air purging of the working area around the hand-held power tool 10.

[0222] The cooling air wheel 60 has a fan section 61. The fan section 61 comprises a supporting wall 62, from which fan blades 63 protrude and / or on which fan blades 63 are arranged.

[0223] The fan blades 63 can also be held, for example, on annular supports 262, preferably having different diameters, spaced apart from one another with respect to the motor axis M, which supports can be provided instead of the supporting wall 62 or in addition to the supporting wall 62. The supports 262 are shown schematically.

[0224] The supporting wall 62 protrudes from a holding section 64 of the cooling air wheel 60 or is arranged on the holding section 64.

[0225] The holding section 64 has a shaft receptacle 65, designed, for example, as a through-opening, for receiving the motor shaft 12C. The holding section 64 is designed, for example, as a cylindrical section or a holding cylinder.

[0226] Ribs 66 advantageously protrude from the holding section 64, which serve, for example, as support ribs and / or contribute to generating or directing the cooling air flow K. The ribs 66 are advantageously oriented parallel to the motor axis M. Flat sides of the ribs 66 advantageously extend parallel to the motor axis M.

[0227] The cooling air impeller 60 forms an axial-radial fan or diagonal fan. The fan blades 63 are inclined relative to the motor axis M.

[0228] The fan blades 63 have axial sections 63A and radial sections 63B.

[0229] The axial sections 63A can serve to ensure that the cooling air flow K flows through and around the drive motor 12. The axial sections 63A ensure an axial flow direction of the cooling air flow K approximately parallel to the motor axis M or along the motor axis M on an intake side of the cooling air wheel 60. The cooling air flow K is, so to speak, sucked in through the axial sections 63A.

[0230] The axial sections 63A of the fan blades 63 merge into the radial sections 63B in the manner of an interlacing.

[0231] The radial sections 63B advantageously ensure that the cooling air flow K is blown out or conveyed away radially with respect to the motor axis M, so that the cooling air flow K flows out of the motor receiving space 16C via the outlet openings 15B.

[0232] The axial sections 63A carry a volume of the cooling air flow K in the direction of the radial sections 63B.

[0233] With respect to the direction of rotation DR, the axial sections 63A are relatively gently inclined. With respect to the direction of rotation DR, the axial sections 63A preferably have an inclination of, for example, 30° to 50°, in particular an inclination of approximately 45°. The axial sections 63A preferably also have this inclination with respect to the motor axis M, which is simultaneously the axis of rotation of the cooling air wheel 60.

[0234] With respect to the direction of rotation DR, the axial sections 63A are inclined slightly flatter than the radial sections 63B.

[0235] The fan blades 63 have leading blade edges or leading edges 63C or leading edges in the direction of rotation DR and rear blade edges or trailing edges 63D or trailing edges in the direction of rotation DR.

[0236] The blade leading edge 63C is advantageously arranged in front of the blade trailing edge 63D in the direction of rotation DR.

[0237] For example, the leading edge 63C runs essentially radially to the motor axis M. The trailing edge 63D, on the other hand, runs essentially parallel to the motor axis M.

[0238] The fan blades 63, in particular the radial sections 63B, can also be provided to accelerate the cooling air flow K, in particular such that, for example, a high differential pressure can be generated, in particular in a diffuser of the hand-held power tool 10 that adjoins the radial sections and surrounds the cooling air wheel 60. For example, it is provided that an inlet flow cross-section 63E, which extends between fan blades 63 arranged one behind the other in the direction of rotation DR and / or adjacent thereto, between their inlet edges 63C, is larger than an outlet flow cross-section 63F, which is delimited, among other things, by the outlet edges 63D of these fan blades 63.

[0239] From the following description, measures will become apparent due to which the grinding machine 11 is particularly compact with respect to its extension parallel to the tool axis W or motor axis M, even though it has a dust air wheel 32 in its drive train 13B.

[0240] Furthermore, the cooling air wheel 60 and the bearing support 150 are preferably designed such that they can engage into a tapered section 16D of the machine housing 15. The drive motor 12, for example, is accommodated in the tapered section 16D. The tapered section 16D extends between the handle section 17 and the cover 30 and can, for example, be grasped by an operator. In particular, an operator's fingers can engage in the tapered section 16D when the operator's hand rests on the handle section 17. Furthermore, the reach-through opening 18A is arranged next to the tapered section 16D. Thus, the tapered section 16D advantageously contributes to an enlargement of the reach-through opening 18A.

[0241] The dome-like or approximately frustoconical wall 151, on the upper side of which the cooling air wheel 60 nestles, contributes to a particularly compact design and / or low construction with respect to the motor axis M or tool axis W.

[0242] It is advantageously provided that the mutually facing sides of the cooling air wheel 60 and the wall 151 are designed to match each other and / or have matching geometric shapes and / or contours.

[0243] Likewise adapted to the wall 151, namely to its underside, is the dust air wheel 32, which on its upper side facing the wall 151 also has a dome-like or approximately truncated cone-like contour at least on a section opposite the wall 151.

[0244] The cooling air wheel 60, in particular the supporting wall 62, has an overall approximately bell-shaped and / or dome-shaped and / or approximately truncated cone shape. On a side of the supporting wall 62 facing away from the fan blades 63, the supporting wall 62 defines a cooling air wheel receiving space 67.

[0245] The cooling air wheel receiving space 67 allows the arrangement of several components.

[0246] For example, the bearing support 150 is at least partially arranged in the cooling air wheel receiving space 67. In particular, the wall section or the wall 151 extends into the cooling air wheel receiving space 67. Thus, a bulkhead separating the dust removal space 31 from the motor receiving space 16C in the form of the bearing support 150 is arranged in the cooling air wheel receiving space 67 or an interior space of the cooling air wheel 60.

[0247] The wall section or wall 151 has, at least in the region of the cooling air wheel receiving space 67, an approximately bell-shaped configuration corresponding to the shape of the supporting wall 62 in the region of the wall 151. For example, flat sides of the wall section or wall 151 and the supporting wall 62 lie flatly opposite one another.

[0248] Furthermore, the engine mount 12E is arranged in the cooling air wheel receiving space 67. The engine mount 12E is completely accommodated in the cooling air wheel receiving space 67. The engine mount 12E is held on a section of the bearing carrier 150 arranged in the cooling air wheel receiving space 67, namely on the bearing receptacle 155.

[0249] Furthermore, the gear 13 and / or the eccentric bearing 13A is at least partially accommodated in the cooling air wheel receiving space 67.

[0250] The holding body 12H, which holds the gear 13 or eccentric bearing 13A, is also at least partially accommodated in the cooling air wheel receiving space 67.

[0251] The holding body 12H and / or the gear 13 and / or the eccentric bearing 13A protrude at least partially in front of the cooling air wheel receiving space 67 on a side facing away from the drive motor 12. Nevertheless, a large part, for example approximately half, of the holding body 12H and / or the gear 13 and / or the eccentric bearing 13A extends parallel to the motor axis M into the cooling air wheel receiving space 67.

[0252] Finally, a portion of the dust-generating air wheel 32 is also arranged in the cooling-air wheel receiving space 67. For example, a holding section 32B of the dust-generating air wheel 32 extends into the cooling-air wheel receiving space 67. A fan section 32C, adjacent to the holding section 32B and on which fan blades 32D are arranged, protrudes in front of the cooling-air wheel receiving space 67. The fan blades 32D serve to generate an air flow relative to the motor axis M or the tool axis W, which forms a component of the dust-generating air flow S.

[0253] The dust air wheel 32 is held on the receiving element 12F in a rotationally fixed manner with respect to the motor axis M.

[0254] The dust air wheel 32 has a receptacle 32E for the receiving element 12F of the motor shaft 12C. The receiving element 12F passes through the receptacle 32E or is held in the receptacle 32E, in particular held in a rotationally fixed manner.

[0255] The receptacle 32E forms a dust air wheel receiving space 32G, for example for receiving the gear 13.

[0256] The dust air wheel 32 has a balancing section 32F, which serves, for example, to compensate for imbalances caused by the eccentric bearing of the tool holder 14.

[0257] The dust air wheel 32 further engages an interior space or a passage opening of an air guide body 37. The air guide body 37 is designed, for example, as a disc or as a disc-shaped body.

[0258] The air guide body 37 is sandwiched between the seal 31A and the bearing support 150. The seal 31A thus serves to hold the air guide body 37 to the bearing support 150.

[0259] The seal 31A is held to the bearing bracket 150, for example, with screws 32L.

[0260] A cover body 39 is arranged on the bearing support 150 on a side facing away from the dust removal chamber 31. The cover body 39 has an annular plate portion 39A surrounding a passage opening 39C into which the wall portion or wall 151 engages.

[0261] A wall section 39B protrudes from the plate section 39A, which covers and closes the channel section 154.

[0262] Furthermore, the cooling air wheel 60 is also arranged in the passage opening 39C or engages in the passage opening 39C. The cover body 39, in particular the plate section 39A, also serves to direct the cooling air flow K. For example, the cooling air flow K can flow along a side of the plate section 39A facing away from the dust air wheel 60 and is directed from this side radially outward relative to the motor axis M in the direction of the outlet openings 15B.

[0263] Receptacles 39D are arranged on the plate section 39A, for example, on the side along which the cooling air flow K flows. Support ribs or support sections 15C of the machine housing 15 can engage positively in the receptacle 39D, so that the cover body 39 is held positively on the machine housing 15, for example, to prevent rotation relative to the motor axis M and / or to reinforce the machine housing 15.

[0264] The hand-held power tool 10 advantageously has a lighting device 100. The lighting device 100 comprises, for example, an annular support 101 on which lighting elements, in particular LEDs, not visible in the drawing, are arranged.

[0265] The assembly of the lighting device 100 is simple in that the lighting device 100 is clamped between the cover body 39 and the air guide body 37. The cover body 39 and / or the air guide body 37 are preferably resiliently flexible, so that vibrations emanating, for example, from the drive train 13B have little or no effect on the lighting device 100.

[0266] The lighting device 100 is fixed radially with respect to the motor axis M by means of the components holding it, for example the cover body 39 and / or the air guide body 37 and / or the bearing carrier 150.

[0267] Advantageously, the lighting device 100 is received in a groove provided by the components holding it, for example the cover body 39 and / or the air guide body 37 and / or the bearing carrier 150.

[0268] Furthermore, the assembly is also very simple because the bearing support 150, when fastened to the machine housing 15 with the screws 153, fixes the components arranged between the bearing support 150 and the machine housing 15, including the cover body 39 and the air guide body 37, as well as the lighting device 100, which may be clamped between these two aforementioned bodies 39 and 37, with respect to the machine housing 15.

[0269] Using a connecting cable 102, the lighting device 100 can be connected to a controller 120 of the hand-held power tool 10, shown schematically in the drawing. A switch 103 is used to turn the lighting device 100 on and off. The switch 103 can be connected directly to the connecting cable 102 or to the controller 120.

[0270] The controller 120 is advantageously arranged in the handle 18. The controller 120 is expediently arranged between the inlet openings 15A and the drive motor 12, so that the cooling air flow K flowing in via the inlet openings 15A can cool the controller 120.

[0271] A further switch 121 is used to switch the drive motor 12 on and off. The switch 121 is advantageously arranged on the front side 19 of the machine housing 15, in particular directly below or next to the handle section 12, so that an operator can easily grasp and actuate the switch 121.

Claims

1. Grinding machine (11) with a machine housing (15) and a drive motor (12), in particular an electric one, arranged in the machine housing (15) for rotating and / or oscillatingly driving a tool holder (14) to which a disc tool (90) can be detachably fastened, wherein the grinding machine (11) has a cover (30) for the disc tool (90) which delimits a dust removal chamber (31) in which the tool holder (14) is arranged and which is provided and designed to receive the disc tool (90) when the disc tool (90) is arranged on the tool holder (14), wherein a dust removal connection (33) through which a dust air stream can flow is arranged on the dust removal chamber (31), to which a dust removal device (50), in particular forming a component of the grinding machine (11) or of a system comprising the grinding machine (11),in particular a suction hose (70A) for connecting the grinding machine (11) to a vacuum cleaner (STA) or a dust collection device (70), wherein the dust air flow is provided for conveying dust arising during operation of the grinding machine (11) out of the dust removal chamber (31), , characterized in that at least one external air inlet (40) for admitting external air (F) is arranged apart from and separately from the dust removal connection (33) on the dust removal chamber (31), and the grinding machine (11) has a closure device (41A, 41B) arranged on the dust removal device (50) or actuatable by the dust removal device (50), with which the external air inlet (40) can be closed completely or at least partially.

2. Grinding machine (11) according to claim 1, characterized in thatit has a dust air wheel (32) for generating a dust air flow, wherein it is advantageously provided that the dust air wheel (32) sucks in external air (F) flowing through the external air inlet (40) to generate the dust air flow or is provided and designed to suck in the external air through the external air inlet (40) to generate the dust air flow.

3. Grinding machine (11) according to one of the preceding claims, characterized in that the external air inlet (40) is arranged directly next to the dust removal connection (33) and / or laterally next to the dust removal connection (33) and / or not on the dust removal connection (33) and / or that the dust removal connection (33) projects towards the external air inlet (40) or in front of the external air inlet (40), so that a closure part (42A) or actuating part of the dust removal device (50), in particular of the dust collecting device (70), can reach in front of the external air inlet (40) when connected to the dust removal connection (33).

4. Grinding machine according to one of the preceding claims, characterized in thatthe dust removal device (50) has a plug-in guide and / or a plug-in guide contour and / or an anti-twist contour, which is designed to guide the dust removal device (50) with respect to a plug-in axis along which the dust removal device can be plugged onto the dust removal connection, in such a way that the closure part (42A) is opposite the external air inlet (40) when the dust removal device (50) is plugged onto the dust removal connection (33) and / or completely or at least substantially closes the external air inlet (40) and / or that the dust removal device (50), in particular the dust collection device (70), has a closure part (42A) for closing the external air inlet (40), wherein it is advantageously provided that the dust removal device (50) has a particularly tubular connection body (51A,51B) for flow-tight connection to the dust removal connection (33) and the closure part (42A) is arranged separately from the connection body (51A, 51B) and / or next to the connection body (51A, 51B).

5. Grinding machine according to one of the preceding claims, characterized in thatthe external air inlet (40) is arranged next to the dust removal connection (33) in such a way that the external air inlet (40) has a larger flow cross-section for the flow of external air (F) when a connecting body (51A, 51B) of the suction hose (70A) is connected to the dust removal connection (33) than when a connecting body (51A, 51B) of the dust collection device (70) is connected to the dust removal connection (33) and / or that the dust collection device (70) is provided and designed to completely close the external air inlet (40) and / or the external air inlet (40) remains completely or substantially completely free for the flow of external air (F) when the suction hose (70A) is connected.

6. Grinding machine according to one of the preceding claims, characterized in thatthe closure device (41A, 41B) has a closure member which is mounted on the grinding machine (11) or the dust removal device (50), in particular the dust collection device (70), by means of a bearing device so as to be adjustable between an open position releasing the external air inlet (40) and a closed position at least partially closing the external air inlet (40), wherein it is advantageously provided that the bearing device mounts the closure member displaceably and / or pivotably and / or that the closure member has a drive contour or is movement-coupled to a drive contour which can be actuated by the dust removal device (50) upon connection to the dust removal connection (33) and / or upon removal from the dust removal connection (33) in order to adjust the closure member between the open position and the closed position.

7. Grinding machine (11) according to one of the preceding claims, characterized in thatthe machine housing (15) has a handle (18) which projects rearwardly opposite a main working direction (HA) provided for the regular machining of a workpiece using the grinding machine (11), wherein the dust removal connection (33) projects in front of the machine housing (15) in the direction of the handle (18) and / or that the external air inlet (40) is arranged on a rear side (20) of the machine housing (15) opposite the main working direction (HA) and / or in the region of the handle (18).

8. Grinding machine (11) according to one of the preceding claims, characterized in that it forms part of a system which has the dust removal device, wherein the dust removal device comprises the or at least one closure device (41A, 41B).

9. Grinding machine (11) according to one of the preceding claims under the preamble of claim 1, characterized in thatthe machine housing (15) has, on an upper side facing away from the tool holder (14) or opposite the tool holder (14), a support contour arrangement (28) with at least one support contour for setting down the grinding machine (11) with its upper side on a base in a manner which prevents it from tipping over.

10. Grinding machine (11) according to claim 9, characterized in thatthe machine housing (15) has a longitudinal center plane (23) and the support contour arrangement (28) is designed and provided for supporting the machine housing (15) in a tilt-proof manner with respect to the longitudinal center plane (23) and / or that the support contour arrangement (28) is designed and provided for supporting the machine housing (15) in a tilt-proof manner with respect to a longitudinal axis of the machine housing (15), wherein the longitudinal axis extends along the longest longitudinal extent of the machine housing (15), wherein it is advantageously provided that the support contour arrangement (28) comprises at least one support rib extending transversely to a longitudinal center plane (23) of the machine housing (15) and / or a support projection spaced transversely from the longitudinal center plane (23), in particular arranged on a handle (18) projecting from a drive section of the machine housing (15) in the direction of the longitudinal center plane (23).

11. Grinding machine (11) according to claim 9 or 10, characterized in that the support contour arrangement (28) comprises a grip portion on the upper side of the machine housing (15), which is provided and designed to support a palm of an operator on the machine housing (15).

12. Grinding machine (11) according to one of claims 9 to 11, characterized in that the support contour arrangement (28) comprises a support contour on a dust collection device (70) or the dust collection device (70) which is connected to the dust removal connection (33).

13. Grinding machine (11) according to one of claims 9 to 12, characterized in that the support contour arrangement (28) is a support contour arranged on an energy storage part of the machine housing (15) comprising an energy storage connection (26) of the grinding machine (11), wherein the support contour and / or the energy storage part has a transverse distance from a longitudinal center plane (23) of the machine housing (15).

14. Grinding machine (11) according to one of the preceding claims, characterized in that it has a suction hose (70A) which is connectable or connected to the dust removal connection (33), wherein the external air inlet (40) is free for the flow of external air (F) when the suction hose (70A) is connected to the dust removal connection (33) or has a larger flow cross-section for the flow of external air (F) than when a connecting body (51A, 51B) of the dust collection device (70) is connected to the dust removal connection (33).

15. Dust removal device (50), in particular dust collection device (70), for use with a grinding machine (11) according to one of the preceding claims, wherein the dust removal device (50) has a closure device (41A, 41B), in particular a closure part (42A), for closing the external air inlet (40) of the grinding machine (11).

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