Handheld grinder

Abstract

To provide a handheld grinding machine that enables simple and fatigue-free grinding, it is proposed that the grinding machine comprise a holding device for holding the grinding machine, a drive motor, a motor housing for the drive motor, and a tool head, wherein the holding device comprises a substantially tubular rod having a proximal end and a distal end, the motor housing and the drive motor located therein being arranged at the proximal end, and the tool head being arranged at the distal end, the rod of the holding device being designed as a single-chamber rod in which a drive shaft for driving the tool head and a flow area for a suction device are provided.

Description

[0001] The present invention relates to a handheld grinding machine, in particular a so-called long-neck grinder.

[0002] Handheld grinding machines are known, for example, from DE 10 2005 021 153 A1, WO 2008 / 033377 A2 or US 2006 / 0073778 A1.

[0003] The present invention is based on the objective of providing a handheld grinding machine which enables simple and, if possible, fatigue-free grinding.

[0004] This problem is solved by a handheld grinding machine according to claim 1. According to the invention, the tubular rod of the holding device is designed as a single-chamber rod in which a drive shaft for driving the tool head and a flow area for a suction device are provided.

[0005] The tubular rod is specifically designed to connect the tool head and the motor housing.

[0006] By designing the tubular rod as a single-chamber rod, both the drive shaft for driving the tool head and the flow area for extracting dust and abrasion generated during the operation of the grinding machine can be arranged together within a chamber formed by the single-chamber rod.

[0007] The single-chamber rod allows for a particularly reduced weight of the tubular rod. This enables simple and virtually fatigue-free grinding with the grinding machine.

[0008] Furthermore, as a single-chamber rod, the tubular rod can be manufactured cost-effectively.

[0009] The drive shaft is, in particular, a flexible shaft. Such a flexible shaft can be bent to a certain radius, deviating from a linear axis of rotation. The flexible shaft can transmit torque even in a bent state.

[0010] A further development of the grinding machine can provide that the rod includes an interior space in which the flow area is formed and through which the drive shaft runs at least section by section.

[0011] In particular, the chamber formed by the single-chamber rod constitutes the interior of the tubular rod.

[0012] The interior of the tubular rod preferably extends along its entire length. That is, the interior of the tubular rod advantageously extends from the distal end to the proximal end within the tubular rod.

[0013] At the distal end and / or the proximal end of the tubular rod, it may have an opening on its end face, through which access to the interior of the tubular rod is formed.

[0014] An advantageous further development of the grinding machine can provide that the rod is designed as a single-walled tube.

[0015] Preferably, the tubular rod has a round, oval, elliptical, or elongated O-shaped cross-section. Likewise, the tubular rod can also have a triangular, square, or polygonal cross-section, preferably with rounded edges.

[0016] Preferably, the wall thickness of the tubular rod is less than the free internal cross-section of the tubular rod.

[0017] For example, the wall thickness of the tubular rod can be approximately 5 mm or less, preferably approximately 3 mm or less. The term "approximately" here refers to a deviation of + / - 10%, preferably + / - 20%, from the specified value.

[0018] The internal cross-section of the tubular rod can, for example, have a diameter of 60 mm or less, preferably 50 mm or less, and particularly preferably about 33 to about 45 mm.

[0019] One design of the grinding machine may also provide that the rod is made of a fiber composite material, in particular a carbon fiber composite material.

[0020] By manufacturing the tubular rod from fiber-reinforced composite material, particularly carbon fiber composite, it can be made exceptionally lightweight. This reduces the overall weight of the grinding machine, resulting in significantly easier and less tiring grinding operations.

[0021] In particular, by forming the tubular rod from the carbon fiber composite material, an optimized haptic experience can be achieved for a user of the grinding machine, since the carbon fiber composite material, especially compared to a metallic material, provides a warm and non-slip surface when gripping.

[0022] Advantageously, the inner wall of the tubular rod, facing the interior of the tubular rod, can be provided with antistatic properties and / or coated with a non-stick coating. This can prevent or at least minimize the adhesion of dust and abrasion generated during the use of the grinding machine and extracted through the airflow area of ​​the tubular rod.

[0023] It is particularly preferred in the grinding machine that the fibers of the fiber composite material in the rod are electrically contacted in order to establish an electrical connection, in particular an earth connection, between the tool head and the motor housing.

[0024] In particular, the fibers of the fiber composite material can be contacted at the proximal end and / or distal end of the rod to form the electrical connection, especially the grounding, between the tool head and the motor housing.

[0025] Since the carbon fibers of the carbon fiber composite material, in particular, exhibit electrically conductive properties, they can become statically charged during operation of the grinding machine due to the dust and abrasion flowing along the inner wall. Electrical contact, especially grounding, can prevent this static charging of the rod, thus preventing dust and abrasion from adhering to the inner wall of the rod.

[0026] In a further development of the grinding machine, a discharge section can be provided at the proximal end of the rod to direct a flow out of the flow area.

[0027] The discharge section is specifically designed to remove the flow from the tool head through the flow area of ​​the tubular rod, along with the dust and abrasion generated by the operation of the grinding machine, from the flow area.

[0028] The outlet section is designed in particular to guide the flow from the tubular rod to an outside.

[0029] Another advantageous embodiment of the grinding machine can provide that the discharge section includes a flow passage formed in a wall of the rod and preferably a lateral flow discharge from the flow area is provided through the flow passage.

[0030] Through the flow passage, a flow connection can be formed between the interior of the tubular rod and the outside of the rod to guide the flow out of the flow area.

[0031] By forming the flow passage in the wall of the rod, the flow can be discharged laterally from the interior of the rod.

[0032] The flow passage thus allows for a deflection of the flow within the flow area of ​​the tubular rod to the outside of the rod.

[0033] In a further development of the grinding machine, a connection device for connecting an extraction device can be provided at the discharge section.

[0034] The extraction device is preferably a portable or stationary extraction device, in particular a vacuum cleaner.

[0035] The extraction device can be coupled to the connection device of the discharge section, for example by means of a plug connection and / or snap connection.

[0036] Preferably, a coupling element of a hose or pipe of the extraction device can be detachably connected to the connection device of the discharge section.

[0037] It may be advantageous in the grinding machine that the discharge section includes at least one discharge element which is arranged at the proximal end of the rod and through which a flow guide from the flow area into the flow passage is provided.

[0038] The discharge element is preferably arranged at least partially inside the rod at the proximal end of the rod.

[0039] The discharge element can be designed as a molded part and / or an injection-molded part or the like.

[0040] Preferably, the discharge element can be made of a fiber composite material.

[0041] The discharge element can preferably be made of a carbon fiber composite material.

[0042] Alternatively, the discharge element can also be made of a plastic or a metallic material.

[0043] The discharge element is specifically designed to cause a flow deflection, whereby the flow, which flows essentially linearly through the flow area in the tubular rod, is deflected in order to be discharged laterally through the flow passage in the tubular rod.

[0044] In addition, a design of the grinding machine may provide that the flow guidance from the flow area into the flow passage is formed by a discharge slope of the at least one discharge element facing the interior of the rod.

[0045] The discharge slope facing the interior of the rod, i.e., the flow region in the rod, preferably has an orientation by which the flow flowing through the flow region in the tubular rod is deflected in the direction of the flow passage provided laterally in the wall of the rod, in order to discharge the flow laterally from the interior of the rod.

[0046] Furthermore, a further development of the grinding machine may provide that at least one discharge element is inserted into the proximal end of the rod or is attached to the proximal end of the rod.

[0047] For example, the discharge element can be inserted into the proximal end of the rod in a plug-like shape.

[0048] The discharge slope can form an inclined end face of the discharge element, which is aligned to the interior of the tubular rod by inserting or attaching the discharge element into or onto the proximal end of the rod.

[0049] Advantageously, the discharge element in the grinding machine can have antistatic properties.

[0050] Preferably, the discharge element is made of a material that has antistatic properties.

[0051] It can also be provided that at least the discharge slope of the discharge element is provided with antistatic properties or is coated with an antistatic coating.

[0052] Advantageously, the discharge element, preferably the fibers of the fiber composite material, in particular the carbon fibers, can be electrically contacted.

[0053] By electrically contacting the fibers of the discharge element, an electrical connection, in particular an earth connection, of the discharge element can be formed in order to prevent static charging of the discharge element due to the flow of dust and abrasion along it.

[0054] Furthermore, a design of the grinding machine may provide that at least one discharge element is attached to the motor housing or is at least partially integral with the motor housing.

[0055] The discharge element can therefore be designed as a separate component that is attached to the motor housing and / or the proximal end of the tubular rod.

[0056] Likewise, the discharge element can be formed at least partially as an integral section of the motor housing, or as a section of a part of the motor housing.

[0057] The tubular rod can be placed on top of the discharge element or inserted into it, if the tubular rod and the motor housing are coupled together.

[0058] In a further development of the grinding machine, at least one discharge element can include a drive shaft passage through which the drive shaft is led from the motor housing into the interior of the rod.

[0059] Preferably, the drive shaft passage may extend through the discharge ramp.

[0060] The drive shaft passage can advantageously include a bearing for the drive shaft, for example in the form of a sliding bearing or rolling bearing.

[0061] The drive shaft passage can thus form a radial bearing for the drive shaft.

[0062] The drive shaft passage can include or form a seal, providing a fluidic seal between the interior of the rod and the engine housing. This prevents the flow, along with dust and abrasion debris, from entering the engine housing from the flow path of the tubular rod.

[0063] Advantageously, in the grinding machine, the drive shaft can be provided with a covering, preferably made of rubber, a plastic or the like, at least in the interior of the rod, and the covering can have a friction-minimizing guide, preferably made of a PTFE material or the like, for the drive shaft.

[0064] The sheathing can provide protection for the drive shaft against dust and abrasion in the interior or flow area of ​​the rod and / or provide guidance or support for the drive shaft.

[0065] Preferably, the casing is made of rubber or a plastic. In particular, the casing has antistatic properties.

[0066] A friction-minimizing guide can be provided on one of the inner sides of the casing facing the drive shaft.

[0067] Particularly in the bent state of the flexible shaft, the friction-minimizing guide can enable low-friction rotation of the shaft.

[0068] The friction-minimizing guide can, for example, be made of a PTFE material or the like.

[0069] Further preferred features and / or advantages of the invention are the subject of the following description and the graphic representation of exemplary embodiments.

[0070] The figures show: Fig. 1 A schematic perspective representation of a handheld grinding machine, looking at the top of the grinding machine; Fig. 2 a schematic sectional view of a tool head of the grinding machine; Fig. 3 a schematic sectional view of a connection section between a holding device and a flexible tube element of the grinding machine; Fig. 4 a schematic sectional view of a motor housing of the grinding machine; Fig. 5 a schematic perspective sectional view of the motor housing of the grinding machine in Fig. 4; Fig. 6 another schematic perspective sectional view of the motor housing of the grinding machine in Fig. 4; Fig. 7 a schematic perspective detail section view of a connecting section between the holding device and the motor housing; Fig. 8 a schematic sectional view of a housing inlet for a power cable of the grinding machine; Fig. 9 a schematic perspective view of the housing entrance according to Fig. 8 with the power cable in a pre-fixed arrangement; Fig. Figure 10 shows a schematic perspective view of the housing entrance with the power cable in a fixed arrangement. Identical or functionally equivalent elements are designated with the same reference symbols in all figures.

[0071] The Fig. Figures 1 to 10 show an embodiment of a handheld grinding machine, designated as a whole by 100, which is also referred to as a long-reach sander. Large surfaces, in particular wall surfaces, ceiling surfaces and floor surfaces, can be processed easily and conveniently with such a grinding machine 100.

[0072] The grinding machine 100 has a tool head 102 which includes a tool holder 104 for receiving a machining tool 106, for example an abrasive.

[0073] The tool head 102 is pivotably mounted on a holding device 110 of the grinding machine 100 by means of a swiveling device 108.

[0074] The swivel device 108 comprises a fork element 112 and a swivel element 116 arranged pivotably about a swivel axis 114 on the fork element 112.

[0075] The pivoting element 116 is designed, for example, as a pivoting ring 118, as is particularly the case in Fig. 2 is evident.

[0076] The fork element 112 is pivotably connected to a housing 120 of the tool head 102 by means of the swivel ring 118.

[0077] The fork element 112, the swivel element 116 and the housing 120 of the tool head 102 are connected to each other in such a way that the tool head 102 can be pivoted relative to the fork element 112 about two pivot axes 114 which are essentially perpendicular to each other.

[0078] The holding device 110 of the grinding machine 100 comprises a tubular rod 122, which has a proximal end 124 facing the user in the state of use and a distal end 126 facing away from the user in the state of use.

[0079] The fork element 112 and the tool head 102 arranged thereon are provided at the distal end 126 of the tubular rod 122 of the holding device 110.

[0080] A motor housing 128 of the grinding machine 100 is arranged at the proximal end 124 of the tubular rod 122 of the holding device 110.

[0081] The motor housing 128 of the grinding machine 100 contains a drive motor 130 of the grinding machine 100.

[0082] A handle element 132 is provided on the motor housing 128, by which a user can grip the grinding machine 100.

[0083] The drive motor 130 is coupled to the tool holder 104 by means of a flexible shaft 134 (drive shaft), so that the tool holder 104 with the machining tool 106 arranged on it can be driven in a rotating, oscillating and / or eccentric manner.

[0084] The flexible shaft 134 runs at least partially inside the tubular rod 122.

[0085] Furthermore, the flexible shaft 134 runs at least partially inside a flexible tube element 136, by means of which the tubular rod 122 is coupled to the housing 102.

[0086] For an optimized weight distribution of the grinding machine 100, the drive motor 130 is preferably arranged on a side opposite the tool head 102 of a central axis 138 of the tubular rod 122.

[0087] When the grinding machine 100 is in use, the user can grasp the handle element 132 and the tubular rod 122 of the holding device 110 of the grinding machine 100, for example to perform a machining operation.

[0088] To provide an action radius within which the user, starting from a predetermined standing position, can reach a surface to be machined with the tool head 102, for example for machining high ceilings, an extension element 140 can be arranged on the motor housing 128 or the handle element 132.

[0089] The extension element 140 can be detachably attached to the grinding machine 100, in particular to the motor housing 128 or the handle element 132 of the grinding machine 100.

[0090] The extension element 140 comprises in particular a tubular rod 142, which preferably forms an extension of the tubular rod 122 of the holding device 110 of the grinding machine 100.

[0091] In Fig. Figure 3 shows a schematic detail view in longitudinal section of a connecting section 144 between the holding device 110 and the flexible tube element 136 of the grinding machine 100.

[0092] The connecting section 144 comprises a sleeve element 146 on which two opposing insertion sections 148 are formed.

[0093] The insertion sections 148 of the sleeve element 146 have, on one side, an end of the flexible tube element 136 opposite the tool head 102 and, on the opposite side, the distal end 126 of the tubular rod 122 inserted to couple them together.

[0094] Fastening devices 152 can be provided on the sleeve element 146, each of which is assigned to the insertion sections 148 of the sleeve element 146.

[0095] The fastening devices 152 can include fastening means, for example screws, pins, locking elements or the like, to couple the tubular rod 122 and the flexible tube element 136 to the sleeve element 146, preferably to couple detachably.

[0096] The sleeve element 146 includes a guide device 150 for the flexible shaft 134. This guide device 150 forms a guide for the flexible shaft 134, enabling it to be guided from the tubular rod 122 into the flexible tube element 136.

[0097] The guide device 150 forms a bearing for the flexible shaft 134. The guide device 150 can, for example, comprise a sliding bearing or a rolling bearing, by which the flexible shaft 134 is rotatably mounted in a radial direction.

[0098] The sleeve element 146 has an internal cavity 154, through which a flow connection is formed between an interior space 160 of the tubular rod 122 and an interior space of the flexible tube element 136, which will be discussed in more detail below.

[0099] The flexible shaft 134 runs in particular within this cavity 154 of the sleeve element 146.

[0100] Fig. Figure 4 shows a schematic sectional view of the motor housing 128 of the grinding machine 100 and the Fig. 5 and Fig. Figure 6 shows further schematic perspective sectional views of the [object]. Fig. 4 Motor housing 128 shown from different viewing angles.

[0101] A connecting section 156 is provided on the motor housing 128 to couple the proximal end 124 of the tubular rod 122 to the motor housing 128.

[0102] The tubular rod 122 is inserted with its proximal end 124 into the connecting section 156 on the motor housing 128.

[0103] A fastening device 158 can be provided on the connecting section 156 to fasten the tubular rod 122 to the motor housing 128.

[0104] The fastening device 158 can comprise several fastening means, for example screws, pins, locking elements or the like, to fasten the tubular rod 122 to the motor housing 128, preferably detachably.

[0105] The tubular rod 122 is designed in particular as a single-chamber rod.

[0106] A single-chamber rod is understood to mean that an interior space 160, preferably only a single interior space 160, is formed in the tubular rod 122, which extends from the proximal end 124 of the tubular rod 122 to the distal end 126 of the tubular rod 122.

[0107] Openings are provided at the proximal end 124 of the tubular rod 122 and at the distal end 126 of the tubular rod 122, through which the interior 160 is accessible from both ends 124, 126.

[0108] Preferably, the tubular rod 122 designed as a single-chamber rod is a single-walled tube.

[0109] The tubular rod 122 can, for example, have a round, oval, elliptical or elongated O-shaped cross-section.

[0110] Likewise, the tubular rod 122 can have a triangular, square or polygonal cross-section, preferably with rounded edges.

[0111] In particular, the tubular rod 122 is made of a fiber composite material, preferably a carbon fiber composite material.

[0112] To minimize the adhesion properties of the tubular rod 122, at least the interior 160 of the tubular rod 122 can be provided with antistatic properties or coated with an antistatic and / or anti-stick coating.

[0113] In particular, the fibers of the fiber composite material are electrically contacted at the proximal and distal ends 124, 126 of the rod 122, so that an electrical connection, in particular an earth connection, is formed between the tool head 102 and the motor housing 128.

[0114] In particular, the carbon fibers of the carbon fiber composite material exhibit electrically conductive properties, so the rod can become statically charged due to dust and abrasion flowing along its inner wall. This can be prevented by electrical contact, especially grounding, in order to prevent dust and abrasion from adhering to the flow area 162 within the rod 122.

[0115] The grinding machine 100 includes a suction channel 164 that extends from the tool head 102 to the proximal end 124 of the tubular rod 122.

[0116] Through the extraction channel 164, dust and abrasion generated in the area of ​​the tool head 102 during the operation of the grinding machine 100 can be conveyed and disposed of through the extraction channel 164.

[0117] The flexible pipe element 136 and the tubular rod 122 form flow sections of the suction channel 164.

[0118] In particular, the flow area 162 is formed by the interior 160 of the tubular rod 122, which forms a flow section of the suction channel 164.

[0119] At the proximal end 124 of the tubular rod 122, a discharge section 166 is provided, through which a flow S flowing through the flow area 162, i.e. the extracted dust and abrasion, can be discharged or extracted.

[0120] A connection device 168 is provided on the discharge section 166, through which an extraction device (not shown in detail), in particular a vacuum cleaner, can be coupled to the discharge section 166. This allows the dust and abrasion generated during operation to be extracted and disposed of through the extraction channel 164.

[0121] The discharge section 166 is designed in particular in such a way that a lateral discharge of the flow S from the flow area 162 of the tubular rod 122 is provided.

[0122] Advantageously, the discharge section 166 is arranged on a side of the central axis 138 of the tubular rod 122 opposite the drive motor 130 or on the same side as the tool head 102 with respect to the central axis 138 of the tubular rod 122.

[0123] The discharge section 166 includes a flow passage 170, which is formed in the wall of the tubular rod 122.

[0124] The flow passage 170 is designed as a perforation or recess in the wall of the tubular rod 122.

[0125] Advantageously, the flow passage 170 can be designed in such a way that the recess extends in a slit shape from the proximal end 124 of the tubular rod 122 towards the distal end 126 of the tubular rod 122.

[0126] Preferably, the flow passage 170 is arranged on a side of the central axis 138 of the tubular rod 122 opposite the drive motor 130, or on the same side as the tool head 102 with respect to the central axis 138 of the tubular rod 122.

[0127] The discharge section 166 comprises a discharge element 172, which is inserted into the interior 160 of the tubular rod 122 at the proximal end 124 of the tubular rod 122.

[0128] This discharge element 172 can be attached to the motor housing 128 or be formed integrally with the motor housing 128.

[0129] The discharge element 172 can be designed as a molded part and / or an injection-molded part or the like.

[0130] Preferably, the discharge element 172 is made of a fiber-reinforced composite material, in particular a carbon fiber-reinforced composite material. Likewise, the discharge element 172 can be made of a plastic or metal.

[0131] Advantageously, the discharge element 172, in particular the fibers of the fiber composite material, is electrically contacted to form an electrical connection, especially a ground connection, to the discharge element 172. This prevents static charging of the discharge element 172 due to dust and abrasion flowing along it.

[0132] The discharge element 172 is designed such that it is inserted into the proximal end 124 of the rod 122. For example, the discharge element 172 can be inserted into the interior 160 of the rod 122 at the proximal end 124 of the rod 122 in a plug-like manner.

[0133] Alternatively, the discharge element 172 can also be attached or placed on the proximal end 124 of the rod 122.

[0134] Preferably, the interior 160 of the rod 122, i.e., the flow region 162 within the interior 160 of the rod 122, is sealed fluid-tight by the outlet element 172 towards the proximal end 124 of the tubular rod 122. The flow S in the flow region 162 of the rod 122 is thereby prevented from flowing into the interior of the motor housing 128.

[0135] The discharge element 172 forms a flow guide in the flow area 162 of the rod 122, through which the flow S flowing in the flow area 162 is directed from the flow area 162 into the flow passage 170.

[0136] For this purpose, a discharge slope 174 is formed on the discharge element 172, which is oriented in such a way that it faces the flow area 162 of the rod 122.

[0137] This discharge slope 174 directs the flow S impacting the discharge element 172, in particular the dust and abrasion generated and extracted during the operation of the grinding machine 100 in the area of ​​the tool head 102, from the flow area 162 into the flow passage 170, in order to be discharged from the flow area 162 of the rod 122 via the discharge section 166.

[0138] The discharge slope 174 extends from a wall section of the tubular rod 122 opposite the flow passage 170 at an inclined angle to a rear section of the flow passage 170 in the direction of flow.

[0139] The discharge slope 174 thus runs from the wall section of the tubular rod 122, which is opposite the flow passage 170, at an inclined angle through the interior 160 of the tubular rod 122 to the rear section of the flow passage 170.

[0140] Advantageously, the discharge slope 174 transitions essentially flush into the flow passage 170.

[0141] In this way, the lateral flow discharge from the flow area 162 into the discharge section 166 is formed.

[0142] The discharge element 172 also has a drive shaft passage 176 through which the flexible shaft 134 is led from the interior 160 of the tubular rod 122 into the motor housing 128.

[0143] The drive shaft passage 176 extends in particular through the discharge slope 174 of the discharge element 172.

[0144] The drive shaft passage 176 can have a bearing, for example a sliding bearing or rolling bearing, by which the flexible shaft 134 is radially supported.

[0145] In particular, the drive shaft passage 176 forms a seal or includes a sealing element to create a fluid-tight connection between the interior 160 of the rod 122 and the motor housing 128.

[0146] In the grinding machine 100, it is specifically provided that the flexible shaft 134 runs through the flow area 162 of the tubular rod 122.

[0147] This means that in the tubular rod 122 designed as a single-chamber rod, both the flow area 162 for extracting dust and abrasion and the flexible shaft 134 for driving the tool head 102 are provided in the same interior space 160 of the rod 122.

[0148] To protect and / or guide the drive shaft 134, it has a sheath 178 in the interior 160 of the rod 122. This sheath 178 is preferably made of rubber or a plastic.

[0149] The sheathing 178 can extend into the drive shaft passage 176 at the proximal end 124 of the rod 122 and bear against a circumferential surface 182 of the drive shaft passage 176. This allows, for example, the sealing between the flow area 162 of the rod 122 and the motor housing 128 to be formed.

[0150] The casing 178 has an internal friction-reducing guide 180 through which the flexible shaft 134 is guided with low friction. The friction-reducing guide 180 can, for example, be made of a PTFE material or the like.

[0151] In Fig. Figure 8 shows a schematic sectional view of a housing inlet 184 of the motor housing 128 of the grinding machine 100. This housing inlet 184 is provided for the passage of a power cable 186 into the motor housing 128, in particular to supply the drive motor 130 of the grinding machine 100 with power.

[0152] The housing inlet 184 comprises a housing inlet section 188, which is integrally formed with the motor housing 128 and through which the power cable 186 is passed.

[0153] Preferably, the housing inlet 184 has a circular cross-section.

[0154] One or more engagement sections 192 are formed on an inner wall section 190 of the housing inlet section 188. The engagement section 192 is designed such that a projection 194 on a sleeve 196, in particular a rubber sleeve, which surrounds the power cable 186 at least in the area of ​​the housing inlet 184, engages in it in order to fix the sleeve 196 to the motor housing 128.

[0155] The sleeve 196 is preferably provided to provide a seal to the interior of the motor housing 128 and / or kink protection for the power cable 186 passing through the housing inlet 184.

[0156] The housing inlet 184 includes a cable fixing 198, which is provided inside the motor housing 128 corresponding to the housing inlet section 188.

[0157] The cable fixing 198 comprises a clamping device 200 and a fixing device 202.

[0158] Preferably, the clamping device 200 and the fixing device 202 are arranged essentially one behind the other in an insertion direction of the power cable 186 through the housing entrance 184.

[0159] During the assembly of the motor housing 128, the power cable 186 is first passed through the housing inlet 184 of the motor housing 128 and inserted into the clamping device 200 and the fixing device 202, as shown in Fig. 9 is shown.

[0160] The clamping device 200 is designed such that it comprises two clamping elements 204 arranged at a distance from each other. Preferably, the clamping elements 204 are arranged parallel to each other or at a slightly inclined angle to each other.

[0161] In particular, the clamping elements 204 are arranged at a distance from each other that is slightly smaller than the diameter of the power cable 186, so that the power cable 186 can be clamped between the clamping elements 202.

[0162] The clamping elements 204, spaced apart from each other, are preferably integrally formed with the motor housing 128, in particular with a housing shell of two or more housing shells of the motor housing 128, for example a lower or a right housing shell of the motor housing 128.

[0163] To mount the motor housing 128, the power cable 186 can be pre-fixed in this way, i.e. it is first passed through the housing inlet section 188 and then clamped in a defined position between the clamping elements 202 of the clamping device 200.

[0164] The fixing device 202 comprises several fixing elements 206 which are each provided in pairs corresponding to each other.

[0165] At the in Fig. In the embodiment shown in Figure 8, for example, three pairs of fixing elements 206 are arranged one behind the other in the insertion direction of the power cable 186. Likewise, only two pairs of fixing elements 186 ( Fig. 9 and Fig. 10) or more than three pairs of fixing elements 206 are provided.

[0166] The fixing elements 206 are preferably integrally formed with the motor housing 128.

[0167] In particular, it is provided that one fixing element 206 of a pair of fixing elements 206 is integrally formed with a housing shell of the motor housing 128, for example the lower or the right housing shell of the motor housing 128, and the other fixing element 206 of the pair of fixing elements 206 is integrally formed with the other housing shell of the motor housing 128, for example the upper or the left housing shell of the motor housing 128.

[0168] The pairs of corresponding fixing elements 206 are designed in such a way that in a composite configuration of the motor housing 128 a fixing area is formed between the fixing elements 206 for the power cable 186.

[0169] For this purpose, each pair of fixing elements 206 is designed in such a way that opposite recesses 208 are formed on the fixing elements 206.

[0170] The recesses 208 on the fixing elements 206 can be V-shaped, semicircular or the like.

[0171] The opposing recesses 208 of the respective pair of fixing elements 206 form the fixing area for fixing the power cable 186 between the fixing elements 206.

[0172] In particular, the V-shaped, semicircular or similar recesses 208 of the respective pair of fixing elements 206 provide that the cross-sectional area of ​​the fixing area formed between the fixing elements 206 is successively reduced by assembling the motor housing 128 and has a slightly smaller cross-sectional area in the final assembled configuration of the motor housing 128 than the cross-section of the power cable 186.

[0173] In this way, the power cable 186 is fixed in a fixed position in the assembled configuration of the motor housing 128, i.e. for use with the grinding machine 100, by a press fit between the fixing elements 206.

[0174] The cable fixing 198 designed in this way is therefore intended to first pre-fix the power cable 186 in a defined position by the clamping device 200 for mounting the motor housing 128, in order to then be able to easily assemble the housing shells of the motor housing 128 using the pre-fixed and thus positioned power cable 186 and to fix the power cable 186 in a fixed position by the fixing device 202. Reference symbol list 100 grinding machine 102 Tool head 104 Tool holder 106 Machining tool 108 Swivel device 110 Holding device 112 Fork element 114 Swivel axis 116 Swivel element 118 Swivel ring 120 cases 122 tubular rod 124 proximal end 126 distal end 128 Engine housings 130 drive motor 132 Handle element 134 flexible shaft 136 flexible pipe element 138 Central axis 140 extension element 142 tubular rod 144 Connecting section 146 Sleeve element 148 Insert section 150 guide system 152 Fastening device 154 cavity 156 Connecting section 158 Fastening device 160 interior 162 Flow area 164 Extraction channel 166 Exit section 168 Connection device 170 flow passage 172 Discharge element 174 Exit slope 176 Drive shaft passage 178 Sheathing 180 friction-minimizing guide 182 Circumferential area 184 Housing input 186 power cables 188 Housing inlet section 190 Interior wall section 192 Intervention section 194 lead 196 sleeve 198 Cable fixing 200 clamping device 202 Fixing device 204 clamping element 206 Fixing element 208 Exclusion S Flow direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2005 021 153 A1

[0002] WO 2008 / 033377 A2

[0002] US 2006 / 0073778 A1

[0002]

Claims

[1] Hand-held grinding machine (100), comprising a holding device (110) for holding the grinding machine (100), a drive motor (130), a motor housing (128) for the drive motor (130) and a tool head (102), wherein the holding device (110) comprises a substantially tubular rod (122) having a proximal end (124) and a distal end (126), wherein the motor housing (128) and the drive motor (130) arranged therein are arranged at the proximal end (124), and wherein the tool head (102) is arranged at the distal end (126), characterized by that the rod (122) of the holding device (110) is designed as a single-chamber rod in which a drive shaft (134) for driving the tool head (102) and a flow area (162) for a suction device are provided. [2] Grinding machine according to claim 1, characterized bythat the rod (122) comprises an interior space (160) in which the flow region (162) is formed and through which the drive shaft (134) extends at least in sections. [3] Grinding machine according to claim 1 or 2, characterized by that the rod (122) is designed as a single-walled tube. [4] Grinding machine according to one of the preceding claims, characterized by that the rod (122) is formed from a fiber composite material, in particular a carbon fiber composite material. [5] Grinding machine according to claim 4, characterized by that the fibers of the fiber composite material in the rod (122) are electrically contacted, in particular at the proximal end (124) and / or distal end (126) of the rod (122), in order to establish an electrical connection, in particular an earthing, between the tool head (102) and the motor housing (128). [6] Grinding machine according to one of the preceding claims, characterized bythat a discharge section (166) for discharging a flow (S) from the flow region (162) is provided at the proximal end (124) of the rod (122). [7] Grinding machine according to claim 6, characterized by that the discharge section (166) comprises a flow passage (170) formed in a wall of the rod (122) and a lateral flow discharge from the flow region (162) is preferably provided through the flow passage (170). [8] Grinding machine according to claim 6 or 7, characterized by that a connection device (168) for connecting a suction device is formed on the discharge section (166). [9] Grinding machine according to one of claims 7 or 8, characterized byin that the discharge section (166) comprises at least one discharge element (172) which is arranged at the proximal end (124) of the rod (122) and through which a flow guide from the flow region (162) into the flow passage (170) is provided. [10] Grinding machine according to claim 9, characterized by that the flow guide from the flow region (162) into the flow passage (170) is formed by a discharge slope (174) of the at least one discharge element (172) facing the interior (160) of the rod (122). [11] Grinding machine according to claim 9 or 10, characterized by that the at least one discharge element (172) is inserted into the proximal end (124) of the rod (122) or is plugged onto the proximal end (124) of the rod (122). [12] Grinding machine according to one of claims 9 to 11, characterized by that the discharge element (172) has antistatic properties. [13] Grinding machine according to one of claims 9 to 12, characterized by that the at least one discharge element (172) is attached to the motor housing (128) or is at least partially formed integrally with the motor housing (128). [14] Grinding machine according to one of claims 9 to 13, characterized by that the at least one discharge element (172) comprises a drive shaft passage (176) through which the drive shaft (134) is guided from the motor housing (128) into the interior (160) of the rod (122), wherein the drive shaft passage (176) preferably extends through the discharge slope (174). [15] Grinding machine according to one of the preceding claims, characterized bythat the drive shaft (134) is provided at least in the interior (160) of the rod (122) with a casing (178), preferably made of rubber, a plastic or the like, and the casing (178) has a friction-minimizing guide (180), preferably made of a PTFE material or the like, for the drive shaft (134).

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