MACHINE TOOL WITH A FIRST AND A SECOND BATTERIES

Description

[0001] The present invention relates to a machine tool according to the preamble of claim 1, as known from EP 3 733 352 A1. The machine tool has a first accumulator and a second accumulator as energy sources, and the machine tool comprises a main body and a motor. The machine tool is characterized in particular in that the main body has a first receiving space for receiving the first accumulator and a second receiving space for receiving the second accumulator, wherein the receiving spaces are arranged within a housing of the main body such that the accumulators are accessible and replaceable from a rear side of the main body, and wherein the receiving spaces for the accumulators form a lower termination of the main body of the machine tool. In the context of the invention, this means that the receiving spaces for the accumulators are located in the rear of the main body.The accumulators themselves are located in a lower, rear area of ​​the main body, where they are particularly well protected against falling, moisture or the like. Background of the invention:

[0002] In the field of machine tools, cut-off grinders or angle grinders are well-known, used to make cuts in a substrate or to process the surface of a substrate. Such cut-off grinders or angle grinders typically have a disc-shaped tool, referred to as a cutting or grinding disc.

[0003] Due to the increasing availability of rechargeable batteries, battery-powered cut-off saws with cutting discs and blade diameters larger than 230 mm are being introduced to the market, particularly for applications previously handled by gasoline-powered cut-off saws. Unlike angle grinders, these cut-off saws rely on water jets for dust suppression. Therefore, the design of these tools typically ensures that the batteries and their interfaces are protected from water spray during wet cutting.

[0004] For other applications, such as cutting steel or dry-cutting concrete, the batteries and battery interface should also be protected from metal shavings, sparks, and dust. Furthermore, it is advantageous to protect the batteries, their interface, and especially the battery contacts from environmental influences such as rain and moisture.

[0005] In the prior art, machine tools are known in which – depending on the design – the batteries are protected by various housing components during cutting. Some battery-powered angle grinders are equipped with additional flaps or covers that form a sealed compartment for the battery. However, it has been shown that angle grinders with such additional flaps or covers have several disadvantages in practice. Firstly, the additional component can increase the machine tool's susceptibility to malfunctions. Secondly, the flaps or covers often make changing the battery more difficult. Furthermore, the battery's charge level cannot be directly displayed on the battery itself, as it is completely enclosed, particularly by the additional cover or flap.It is often possible to operate such cut-off saws with the flap or lid open, which can then lead to unwanted dust entering the battery compartment.

[0006] In many other machine tools known from the prior art, the battery is located in an upper area of ​​the main body of the machine tool. While this may offer some protection to the machine tool during cutting, it provides little or no protection to the machine tool and its internal components against weather conditions such as rain or dirty water, which can occur when operating an angle grinder in wet cutting mode.

[0007] The object of the present invention is to overcome the aforementioned shortcomings and disadvantages of the prior art and to provide a machine tool in which the accumulators and their contacts, interfaces, displays, and operating elements are optimally protected against mechanical damage, for example, from being dropped, or against weather conditions such as humidity, rain, or moisture. Furthermore, the accumulators should remain easily accessible and replaceable despite this optimized protection. In this context, experts would welcome the possibility of ensuring optimal accumulator protection without the need for additional flaps or covers on the machine tool.Furthermore, the design of the machine tool and the arrangement of the components within the machine tool should be as simple, compact and robust as possible, and the machine tool should have good ergonomics.

[0008] The problem is solved by the subject matter of the independent claims. Advantageous embodiments relating to the subject matter of the independent claims are found in the dependent claims. Description of the invention:

[0009] According to the invention, a machine tool is provided with a first accumulator and a second accumulator as energy sources. The machine tool also comprises a main body and a motor. The machine tool is characterized in particular by the fact that the main body has a first receiving space for receiving the first accumulator and a second receiving space for receiving the second accumulator, wherein the receiving spaces are arranged within a housing of the main body such that the accumulators are accessible and replaceable from a rear side of the main body, and wherein the receiving spaces for the accumulators form a lower termination of the main body of the machine tool. In the context of the invention, this means that the receiving spaces for the accumulators and / or the second accumulators are located on the rear side of the main body.The accumulators themselves are arranged in a lower, rear area of ​​the main body, where they are particularly well protected against being dropped, moisture, or the like. It is preferred, according to the invention, that the accumulators are arranged in close proximity to an underside and at the rear of the main body of the machine tool, thereby providing optimal protection against mechanical stresses, such as those caused by a fall, and against moisture, wetness, and rain. Examples of a possible arrangement of the accumulators within the main body of the machine tool are shown in the [references to be added]. Fig. 1 and 2 shown.

[0010] It is preferred according to the invention that different types of batteries can be used as energy sources. Batteries with, for example, a comparatively large volume and high capacity can be used. However, it is equally preferred that smaller batteries with a lower capacity are used. Preferably, the first and second batteries can be of the same type. However, it is also preferred according to the invention that different types of batteries are used as energy sources. Preferably, the batteries used are configured to operate with the same interface on the machine tool. In other words, the machine tool can have interfaces and / or contact surfaces that can operate with different types of batteries.This can be achieved, for example, by ensuring that the batteries used as an energy source in the proposed machine tool have interfaces and / or contact surfaces that correspond to the interfaces and contact surfaces of the machine tool. The battery capacity can, for example, range from 3 to 15 ampere-hours (Ah), and their volume, depending on the capacity, from 700 to 1,500 cm³.

[0011] The invention specifically proposes an arrangement of components for a preferably handheld, battery-operated cut-off saw with multiple batteries, preferably two batteries. The position of the batteries and the battery interface is preferably selected such that the batteries are optimally protected against dust, metal shavings, sparks, or mud during cutting. Tests have shown that the batteries, their interface, and their contacts can be particularly effectively protected against environmental influences such as rain or moisture by the invention or the proposed arrangement.

[0012] The arrangement of the other components of the power tool, such as the electronics, motor, handles, gearbox, and cutting disc, is preferably adapted to the position of the batteries. The proposed arrangement is optimized, particularly with regard to robustness, compactness, ergonomics, and ease of assembly. In particular, the batteries are easily accessible, allowing for quick and simple replacement when necessary. Furthermore, with the proposed battery placement in a lower, rear section of the power tool's main body, the battery charge level indicator is easily visible to the user, ensuring they are always aware of the current charge level during operation. This allows the user to effectively manage and plan their work with the cut-off saw.

[0013] It is preferred, according to the invention, that the receiving compartments for the accumulators are arranged side by side. Preferably, they are similar to each other or identical in design. It is preferred, according to the invention, that the two receiving compartments for the two accumulators are arranged axially symmetrically about a conceptual longitudinal axis running centrally through the machine tool. In other words, the receiving compartments can be arranged on a right and on a left side of the virtual longitudinal axis of the machine tool. This allows the design of the machine tool within its main body to be kept simple and compact. Furthermore, the compact design increases the robustness of the proposed machine tool.

[0014] The invention, with the proposed arrangement of the batteries in two compartments, preferably arranged side by side so that the batteries are particularly easily accessible from the rear of the main body, advantageously enables an optimized, simple design for a battery-powered cut-off saw, in which changing the batteries is particularly easy. Furthermore, good protection of the batteries and their interface during operation of the tool can be ensured, as well as good protection against environmental influences such as rain or moisture. The proposed design of the tool, in which the battery compartments are located in a lower, rear area of ​​the main body, represents a robust and simple device design and also allows for good visibility of the battery charge level indicator.

[0015] It is preferred in the context of the invention that the machine tool is an angle grinder. The angle grinder can comprise a rear section, which is formed, for example, by a main body and a protective frame. The main body of the angle grinder can be enclosed in a housing and may include a control unit, a drive or drive train, and / or a motor. The protective frame can comprise a front, circumferential handle and a second, upper handle. The front part of the machine tool is formed by its cutting tool, which, particularly in the case that the machine tool is designed as an angle grinder, is a disc-shaped cutting tool. It can, in particular, be referred to as a cutting disc.It is preferred, according to the invention, that the spatial directions "front" and "back" are defined by the front region of the machine tool formed by the tool and by the rear region of the machine tool formed, among other things, by the main body. The spatial regions "top" and "bottom", or the "top" and "bottom" of the machine tool, are preferably defined by the upper handle ("top"), which, according to the invention, is also preferably referred to as the second handle, and by the protective frame, the underside of which preferably runs along the underside of the machine tool.

[0016] It is preferred, according to the invention, that the machine tool comprises a first, circumferential handle, a second, upper handle, and a protective frame to protect the main body of the machine tool. Details of these components of the machine tool can be seen in the figures. The first, circumferential handle preferably extends in the area of ​​the transition between the front and rear sections of the machine tool and is typically gripped by the left hand of a right-handed person when using the machine tool. In this respect, the first, circumferential handle can also be used for transporting the machine tool. Due to its circumferential design, the first handle provides effective impact protection against falls on the sides of the machine tool, particularly if the machine tool were to land on its right or left side.The circumferential design of the first handle protects, in particular, the components of the machine tool located in the main body, such as the motor, drive, or gearbox, but also the accumulators. It is preferred, according to the invention, that the plane in which the first handle predominantly runs is essentially orthogonal to a longitudinal axis of the machine tool. This longitudinal axis, which can be conceptually placed through the machine tool, runs, in particular, centrally through the device and extends from the front region of the machine tool towards its rear region. It is preferred, according to the invention, that the plane in which the first handle predominantly runs is essentially perpendicular to the longitudinal axis of the machine tool.

[0017] The second, upper handle preferably runs substantially parallel to the virtual longitudinal axis of the machine tool. A right-handed person typically grips this second handle with their right hand when using the machine tool. According to the invention, it is preferred that the upper handle projects beyond the main body of the machine tool in a rearward direction, so that the main body and its internal components are well protected against the machine tool being dropped and landing on its rear side. The projection of the second handle beyond the rear of the main body of the machine tool preferably forms an overhang. According to the invention, the term "overhang" preferably describes the distance between a substantially vertical rear wall of the main body of the machine tool and the furthest point on the rear of the upper handle. This distance, orThe overhang is, for example, in a range of 1 to 12 cm, preferably 3 to 9 cm and particularly preferably at about 6 cm.

[0018] It is preferred according to the invention that the second handle is arranged above the electronics of the machine tool and includes operating switches for the machine tool on its upper and / or lower surface. Since the second handle of the machine tool is typically gripped by the user's right hand, the machine tool can be operated particularly well thanks to the provision of operating switches on the upper and / or lower surface of the second handle. The preferred spatial proximity between the electronics of the machine tool and the at least one operating switch in the second handle significantly shortens the transmission paths for control commands and simplifies or reduces the wiring and circuitry effort within the device.It is preferred, according to the invention, that the area of ​​the second handle, which includes the at least one actuating switch, is designated as the central part of the upper handle. A longitudinal axis running centrally through the central part preferably does not run parallel to a surface on which the machine tool can be placed, but is inclined at an angle of 10 to 30 degrees, preferably at an angle of 15 to 25 degrees, and most preferably at an angle of approximately 20 degrees. This inclination significantly improves the ergonomics of the upper handle. The central part of the upper handle is essentially perpendicular to a rear section of the upper handle. Thus, this rear section of the upper handle is also inclined at the aforementioned angle of approximately 20 degrees with respect to a substantially vertical rear wall of the main body of the machine tool.Tests have shown that the inclination of the second handle of the machine tool significantly improves the ergonomics of the machine tool.

[0019] Furthermore, the proposed machine tool includes a protective frame, the underside of which preferably runs along the underside of the machine tool. It is preferred, according to the invention, that the protective frame has an L-shaped structure, particularly in a side view of the machine tool. In particular, the lower bar of the "L" runs along the underside of the machine tool, while the vertically upward-projecting bar of the preferably laterally inverted "L" runs along the substantially vertical rear wall of the main body of the machine tool. Such a simple L-structure is preferably present on both the right and left sides of the machine tool, so that, according to the invention, the L-shaped structure is preferably also referred to as the "lateral L-shaped structure". It preferably extends around the main body of the machine tool.The two individual L-shaped structures are preferably connected to each other via a connecting web, the connecting web extending through an interior or through-passage space of the upper handle. It is preferred, according to the invention, that the vertically upward-projecting beams of the L-shaped structure of the protective frame form its rear side. The front of the protective frame can preferably also be formed by two vertically upward-projecting beams that run substantially parallel to the rear vertically upward-projecting beams of the protective frame. If the protective frame includes such front-facing vertically upward-projecting beams, the shape of the protective frame can preferably also be described as U-shaped, wherein the protective frame preferably comprises two U-shaped structures that can be arranged on a right and a left side of the tool device and are connected to each other via the connecting web.It is preferred according to the invention that the accumulators are arranged within the interior formed by the U- or L-shaped structures of the protective frame. In other words, the accumulators can be surrounded by the elements of the protective frame, so that the protective frame optimally protects the accumulators against mechanical damage, for example, from a fall. It is preferred according to the invention that the accumulators are arranged above the lower beam of the L- or U-shaped structures of the protective frame. Preferably, the main body of the machine tool is arranged within the protective frame, with the accumulators forming its lower end.

[0020] It is preferred, according to the invention, that the accumulators include contacts with which they can be plugged into the machine tool. For this purpose, the machine tool includes a corresponding connection arrangement with which the contacts of the accumulators can interact. Preferably, the machine tool includes an interface with which the power supply to the device or the energy output of the accumulators can be controlled. It may be preferred, according to the invention, that the machine tool includes one interface that controls the energy output of both accumulators. However, it may also be preferred that the machine tool includes two interfaces, i.e., one interface for each accumulator. It is particularly preferred, according to the invention, that the accumulators can be connected to the electronics of the machine tool via an interface and contacts.

[0021] According to the invention, the upper surface of the main body housing of the machine tool is inclined to ensure a defined flow of liquid. Preferably, the upper surface of the main body housing of the machine tool faces the underside of the central part of the upper handle. Like this central part of the handle, the upper surface of the machine tool housing is also preferably inclined so that rain, dirt, or splash water can optimally drain downwards from the main body of the machine tool. It is particularly preferred, according to the invention, that the main body housing of the machine tool has a rearward inclination. This preferably means, according to the invention, that when the machine tool is placed on a surface, the front part of the main body housing has a greater distance from the surface than the rear part of the main body housing of the machine tool.The inclination of the main body of the machine tool can be described by an angle of inclination B, which preferably forms between an imaginary ground plane on which the machine tool can be placed and a plane that can be conceptually placed through the surface of the housing or main body of the machine tool. The angle of inclination B is preferably in the range of 5 degrees. Tests have shown that an inclined surface of the housing or main body of the machine tool with an angle of inclination of approximately 5 degrees enables optimized drainage of rainwater or protective water.

[0022] The housing of the main body of the machine tool also features ribs to ensure controlled fluid drainage. These ribs direct the fluid to the sides, preventing it from entering the rear of the machine tool or the back of the main body, where, for example, battery control switches or a battery charge indicator might be located. The sloped top of the main body housing and / or the presence of the ribs effectively prevent sensitive machine tool components or battery-related parts from coming into contact with moisture, dampness, or rain and potentially being damaged.

[0023] The proposed machine tool can further be described by an angle of inclination A. This angle of inclination A is preferably formed between an imaginary ground plane on which the machine tool can be placed and a plane that runs centrally through the motor axis and the axis of the cutting disc. According to the invention, it is preferred that this angle of inclination A lies in a range between 10 and 30 degrees, preferably in a range between 15 and 25 degrees, and particularly preferably at approximately 20 degrees. The angles of inclination A and B are described in Fig. 7 depicted.

[0024] It is preferred, in accordance with the invention, that the machine tool does not require an additional flap or cover to protect the batteries from liquid. By eliminating this additional component, which many conventional machine tools have to protect the battery, the machine tool's susceptibility to malfunctions can be significantly reduced. Furthermore, the effort required to change the batteries can be reduced because no cover or flap needs to be opened. Additionally, by omitting the extra covers or flaps, charge level indicators can be provided directly on the batteries, which can also be positioned for optimal visibility by the user, allowing the machine tool operator to quickly and easily monitor the battery charge levels.

[0025] It is preferred according to the invention that the accumulators or their receiving compartments in the proposed machine tool are arranged in the housing of the main body of the machine tool, the housing forming a sealed space that is particularly well sealed against dust and / or moisture, as well as wetness. This effectively prevents unwanted dust from entering the accumulator receiving compartment. The accumulators and their receiving compartments are located in the housing of the machine tool, particularly in a rear, lower region, i.e., in close proximity to a bottom and a rear side of the housing of the machine tool.

[0026] It is preferred according to the invention that the machine tool has damping means to decouple the handles and the protective frame from vibrations that arise during operation of the machine tool. Preferably, the damping means comprise springs, wherein, in particular, three springs are provided to decouple the handles and the protective frame from the vibrations that arise during operation of the machine tool. Possible mounting locations for the preferably three springs are in Fig. 6 depicted.

[0027] It is preferred, according to the invention, that the motor of the machine tool is aligned centrally, transversely to the accumulators and to the working direction of the machine tool. This places the center of gravity of the machine tool essentially in the center of the motor, so that the load on the rotating, front handle is minimized during operation and when carrying the machine tool. In other words, the preferably central arrangement of the motor, whose working axis is preferably perpendicular to a central axis of the machine tool, provides a particularly well-balanced machine tool that, despite its weight, is easy to carry and offers good ergonomics during cutting.

[0028] It is preferred in accordance with the invention that the machine tool comprises a motor housing, wherein the motor housing includes a gearbox of the machine tool, a cutting arm for a tool of the machine tool, and means for driving the tool. Preferably, the means for driving the tool are designed as a belt. The belt, the gearbox, and the cutting arm are arranged in Fig. 5 As shown. It is preferred, according to the invention, that the means for driving the tool runs at least partially parallel to the cutting arm. This essentially parallel arrangement of the cutting arm with respect to the belt for driving the tool of the machine tool is also shown in Fig. 5As illustrated. It is preferred in accordance with the invention that the belt is configured to transmit a rotational movement generated in the motor of the machine tool to the cutting disc of the angle grinder and to drive the cutting disc to the rotational movement with which the cuts can be made in the substrate to be processed.

[0029] It is preferred according to the invention that the machine tool includes at least one protective plate on a front face of the housing of the main body of the machine tool for protecting the machine tool and its components. It is particularly preferred according to the invention that the protective plate forms a lower area of ​​the circumferential first handle, is attached to it, or covers it. Preferably, the front face of the housing of the main body of the machine tool faces the tool of the machine tool, i.e., preferably the cutting disc. Dust, metal chips, sparks, and / or mud splashes can strike this front face of the main body of the machine tool, and the protective plate prevents them from damaging the machine tool or its main body and its internal components, such as the accumulators.This protective effect is further enhanced by the fact that the accumulators are located in a rear area of ​​the main body, i.e., at a maximum distance from the main point of impact for dust, metal shavings, sparks and / or mud splashes on the front of the machine tool's main body. This maximum distance and a possible arrangement of the protective shield are described in [reference to relevant section]. Fig. 2 shown.

[0030] In one embodiment, the invention relates to a battery-powered cut-off saw with two batteries accessible from the rear, which are preferably completely covered from above. The housing has optimized edges and / or surfaces for defined water drainage to protect the batteries and their interface. The other components of the cut-off saw are arranged around the batteries in such a way that the tool can be easily assembled and that the device has good ergonomics.

[0031] In particular, the two batteries are well protected from environmental influences from above. This is advantageously achieved by the provided water drainage on the housing, which is facilitated in particular by the slope of the top of the main body of the power tool and / or the provision of ribs on the housing of the main body of the power tool. A protective plate is provided on the front of the main body of the power tool to protect the batteries from dust, splashing water, or metal sparks. Positioning the batteries in a rear, lower area of ​​the main body of the cut-off saw provides good access to the batteries and a clear view of the battery charge level indicator. Furthermore, the invention provides good protection for the battery interface and, in particular, the battery contacts.

[0032] Further advantages of the invention include mounting the machine tool's electronics in close proximity to the batteries, thereby achieving short transmission paths for control commands and reducing wiring effort. It is preferred, according to the invention, that a central support, preferably also referred to as a support unit, is arranged within the main body of the machine tool. This support unit is preferably made of plastic or comprises one or more plastics. This allows the support unit to be both very stable and particularly lightweight, so that it contributes only minimally to the overall weight of the machine tool. It is preferred, according to the invention, that the support unit is rigidly connected to the motor housing and is configured to accommodate the electronics, interfaces, contacts, batteries, and / or damping elements.It is preferred according to the invention that the support provides an internal structure for the main body of the machine tool, wherein the machine tool components located within the main body can be attached to the support unit. It is also preferred according to the invention that the protective frame and the upper handle can be attached to the support unit. The machine tool housing preferably consists of two housing shells, which can also be mounted on the support unit.

[0033] It is preferred, according to the invention, that the support, together with the motor housing, forms a central component for the cooling airflow. It is preferred, according to the invention, that the electronics of the machine tool are suspended within or on the support unit to effectively prevent the accumulation of dust and / or water. The support unit can include a heat sink for cooling the electronics, and an airflow can be directed through the support for this purpose. It is preferred, according to the invention, that the support unit is inclined backwards at an angle greater than 3 degrees, preferably in the range of 5 degrees.It is preferred, according to the invention, that the angle of inclination is preferably formed between an imaginary ground plane on which the machine tool can be placed and a plane that runs centrally through the support unit of the machine tool. Despite the inclined design of the support unit, it is preferred, according to the invention, that the interfaces and contacts for connecting the machine tool to the accumulators are essentially horizontal. Preferably, the accumulators within the machine tool are also oriented essentially horizontally. The term "essentially horizontal" preferably means, according to the invention, that the aforementioned components are not inclined within the machine tool, i.e., that any straight line or plane passing through them forms an angle of essentially 0 degrees with an imaginary ground plane.In other words, an imaginary straight line or plane through the interfaces, contact surfaces and / or accumulators runs essentially parallel to an imaginary subsurface plane.

[0034] The inclination of the support unit is determined by the top surface or outer contour of the machine tool, ensuring particularly efficient water drainage and thus protecting the battery interfaces and contact surfaces. Additional ribs channel surface water into non-critical areas of the machine tool, optimally protecting the battery interfaces and contact surfaces from moisture.

[0035] Furthermore, the motor of the power tool is arranged transversely to the batteries. The power tool preferably comprises a motor housing, which in turn includes a gearbox, a belt, and a cutting arm. The belt, as the drive means for the cutting disc, preferably operates with a 1:1 gear ratio. A second handle with an operating switch is preferably arranged above or in close proximity to the electronics of the power tool. The cut-off saw also includes a first handle that extends around the saw and incorporates an integrated tap or water valve. Finally, the cut-off saw includes a protective frame that surrounds the batteries and effectively protects them from impacts or drops.While the protective frame primarily protects the batteries against lateral impacts, a rear portion of the upper, second handle protrudes beyond the main body of the power tool; this protrusion is referred to as the overhang. The overhang can, for example, be approximately 6 cm long; it primarily protects the power tool against impacts to the rear. The protective frame and handles of the angle grinder are preferably decoupled from the vibrations generated by the rotation of the cutting disc during operation. For this purpose, the angle grinder can incorporate damping elements, such as springs. A tool for changing the cutting disc can be attached to the underside of the power tool with an O-ring.In accordance with the invention, it is preferred that the cutting disc of the proposed angle grinder has a blade diameter greater than 230 mm.

[0036] Further advantages arise from the following character description. The characters, the description, and the requirements contain numerous features in combination.

[0037] In the figure, identical and similar components are numbered with the same reference symbols. They show: Fig. 1 Side and rear view of a preferred embodiment of the proposed machine tool. Fig. 2 Side and oblique front view of a preferred embodiment of the proposed machine tool. Fig. 3 View of a preferred embodiment of the proposed machine tool without accumulators. Fig. 4 Side view of a preferred embodiment of the proposed machine tool without accumulators. Fig. 5 View of a bottom side of a preferred embodiment of the proposed machine tool. Fig. 6 Oblique rear view of a preferred embodiment of the proposed machine tool without accumulators, without gearbox, without protective frame and without handles. Fig. 7 Side view of a preferred embodiment of the proposed machine tool as a section with indication of angles and inclination. Examples of implementation and description of figures:

[0038] Figure 1Figure 1 shows a side view of a preferred embodiment of the proposed machine tool 1 in the left half of the image and a rear view of a preferred embodiment of the proposed machine tool 1 in the right half of the image. The front area of ​​the machine tool 1 is formed by a tool 25, which in the case of the Fig. 1The cutting edge of the illustrated angle grinder 1 is formed by a cutting disc 25. The tool 25 can be surrounded by a blade guard, which may include a water supply and a handle. The rear section of the machine tool 1 is formed by a main body 4, which has a housing 6. The main body 4 of the machine tool 1 is surrounded by a protective frame 14, which includes an L-shaped structure 16. The L-shaped structure 16 preferably includes a substantially horizontal lower section that runs along the underside of the housing 6 of the machine tool 1. In addition, the L-shaped structure 16 can include a substantially vertical rear section that runs along a rear surface 9 of the main body 4 of the machine tool 1.Preferably, the protective frame 14 comprises two L-shaped structures 16, which are connected to each other via a connecting web at the rear 9 and at the front handle 12 of the main body 4 of the machine tool 1. It is preferred, according to the invention, that the protective frame 14 comprises a preferably circumferentially formed injection-molded plastic part, which may have a U-profile with ribs.

[0039] Furthermore, the machine tool comprises a front, circumferential handle 12 and an upper, second handle 13. Actuating switches 21, by which the machine tool 1 can be operated, can be arranged on the upper, second handle 13. These actuating switches 21 can, in particular, be arranged on the underside of the second handle 13. The machine tool 1 can also have an activation lock 30, which is preferably arranged on the top side of the second handle 13. It is preferred, according to the invention, that the actuating switch 21 can only be operated when the activation lock 30 permits this. It is also preferred, according to the invention, that the underside of the second handle 13 faces or is opposite the top side 10 of the housing 6 of the machine tool 1. The top side 10 of the housing 6 is preferably inclined at 3 to 5 degrees, i.e.,Liquid falling onto the top surface 10 of the housing 6 is deflected in a spatial direction to the rear and / or downwards. This inclination is determined by the tilt angle B (see figure). Fig. 7 ) described. The deflection of the fluid is described in Fig. 1 The fluid drainage is represented by the dashed line in the area of ​​the housing 6 of the machine tool 1. The fluid drainage can be further improved by the presence of ribs 11 on the housing 6 of the main body 4 of the machine tool 1. Possible arrangements of the ribs 11 are shown in the lower figure. Fig. 1 depicted.

[0040] The ribs 11 preferably form a raised boundary of the main body 4 of the machine tool 1. The ribs 11 preferably form a finishing edge of the main body 4 of the machine tool 1, which is arranged, among other places, on the top surface 10 of the housing 6 of the machine tool 1. Ribs 11 can also form the sides of the main body 4 of the machine tool 1 and the rear end of the housing 6 of the machine tool 1. It is preferred, according to the invention, that the ribs 11 have a height of up to 2 cm. The ribs 11 can therefore be 1.75 cm, 1.33 cm, 1 cm, 0.5 cm, or 0.3 cm high, without being limited to these heights. It is preferred, according to the invention, that the ribs 11 are designed to guide water flow, so that dirt and / or rainwater does not enter the area of ​​sensitive components of the machine tool 1. Sensitive areas of machine tool 1 include, for example, the accumulators 2, 3 and 3.their interfaces 18 or contacts 19 or their charge level indicator 31.

[0041] The area of ​​the second handle 13, on which the at least one actuating switch 21 is located, is referred to as the central part of the second handle 13 and is preferably also inclined. The second handle 13 preferably projects beyond a rear surface 9 of the main body 4 of the machine tool 1, thereby forming a so-called overhang 17. This provides particularly good protection for the machine tool 1 and its internal components against vibrations and impacts acting on the machine tool 1 from the direction of the rear surface 9 of the main body 4. In other words, the overhang 17 of the second handle 13 provides particularly good protection for the machine tool 1 if it is in danger of falling onto its rear surface 9.

[0042] The projection 17 also has the further advantage that the distance between the two handles 12, 13 increases, so that the handling of the machine tool 1 can be improved and made safer.

[0043] The motor 5 is located in a front area of ​​the main body 4 of the machine tool 1. A protective plate 28 can be arranged on a front 27 of the housing 6 of the machine tool 1, which protects the main body 4 and its internal components from dust, sparks, dirt, splashing water, or metal shavings. The accumulators 2, 3 of the machine tool 1, which supply the machine tool 1 with energy, are located in a rear, lower area of ​​the main body 4 of the machine tool 1. They thus serve as the energy source of the machine tool 1. The first accumulator 2 is located in a first receiving compartment 7, while the second accumulator 3 is located in a second receiving compartment 8. The arrangement of the accumulators 2, 3 in the receiving compartments 7, 8 within the main body 4 of the machine tool 1 is also shown in the right half of the image. Fig. 1 Clearly visible, showing a rear side 9 of the main body 4 of the machine tool 1.

[0044] A protective plate 28 can be arranged on a front surface 27 of the housing 6 of the machine tool 1, protecting the main body 4 and its internal components from dust, sparks, dirt, splashing water, or metal shavings. The front surface 27 of the housing 6 of the machine tool 1, as well as the protective plate 28 located on the front surface 27 of the housing 6 of the machine tool 1, is particularly important in the following areas: Fig. 2 It is preferred, according to the invention, that the protective shield 28 is attached to the front, circumferential handle 12 or forms a component of this front handle 12. The trajectories of possible objects from which the protective shield 28 is intended to protect the hand-held power tool 1 are also shown. Fig. 2as shown (see arrows below left). Preferably, the protective plate 28 is made of metal or another fire-resistant material in order to protect the machine tool 1, in particular from hot sparks. It is preferred, according to the invention, that the front face 27 of the housing 6 of the machine tool 1 faces or is arranged opposite the tool 25 of the machine tool 1. In particular, Fig. 2 The left half of the image shows a side view of a preferred embodiment of the proposed machine tool 1, and the right half of the image shows an oblique front view of the proposed machine tool 1.

[0045] Fig. 3Figure 1 shows a rear view of a preferred embodiment of the proposed machine tool 1 without accumulators 2, 3. The protective frame 14, as well as the first handle 12 and the second handle 13, are shown. Preferably, the main body 4 of the machine tool 1 with its housing 6 is located within the protective frame 14, with the accumulators 2, 3 and their receiving spaces 7, 8 being arranged within the main body 4 of the machine tool 1. In particular, the accumulators 2, 3 and their receiving spaces 7, 8 are located in a rear, lower region of the main body 4 of the machine tool 1. The housing 6 of the main body 4 of the machine tool 1 comprises a rear section 9, which forms the rear termination of the main body 4 of the machine tool 1. The charge level indicator 31 of the accumulators 2, 3 is clearly visible from the rear below the housing 6 and behind the protective frame 14 of the machine tool 1.

[0046] Due to the in Fig. 3The accumulators 2 and 3, not shown, can be found in Fig. 3 The interface 18 and the contacts 19 for the accumulators 2, 3 are detected.

[0047] Interface 18 and contacts 19 for accumulators 2 and 3 are also in Fig. 4Figure 1 shows a side view of a preferred embodiment of the proposed machine tool 1 without accumulators 2, 3. The electronics 20 of the machine tool 1 are arranged above the interface 18 and above the contacts 19 for the accumulators 2, 3. The electronics 20 are located in close proximity to the actuating switches 21 on the second handle 13 of the machine tool 1 to minimize transmission and communication paths. Furthermore, the electronics 20 are located in close proximity to the accumulators 2, 3, again to shorten transmission and communication paths. The electronics 20 are preferably held by a central support 32, which is also preferably referred to as the support unit 32.It is preferred according to the invention that the carrier unit 32 is fixedly connected to the motor housing 22 and is configured to accommodate the electronics 20, the interfaces 18, the contacts 19, the accumulators 2, 3 and / or the damping elements 15 of the machine tool 1. It is particularly preferred according to the invention that the carrier 32 forms an internal structure for the main body 4 of the machine tool 1, which can support or accommodate the aforementioned components of the machine tool 1.

[0048] Furthermore, in Fig. 4The motor 5 of the machine tool 1 is shown, which is arranged in a front region of the main body 4 of the machine tool 1. The motor 5 has an axis that is essentially orthogonal to a longitudinal axis 29 of the machine tool 1. In other words, the axis of the motor 5 of the machine tool 1 is preferably perpendicular to the longitudinal axis 29 of the machine tool 1. This arrangement is described within the meaning of the invention by stating that the motor 5 of the machine tool 1 is oriented transversely to the accumulators 2, 3 of the machine tool 1. The motor axis projects into Fig. 4 practically out of the picture plane, and its position is also shown in Fig. 5 depicted. Fig. 5 also shows a possible position of the conceptual longitudinal axis 29 of the machine tool 1 (see top right in Fig. 5The motor housing 22 can have air outlets from which the used cooling air can be blown out of the interior of the machine tool 1. In particular, slots can be provided on the underside and / or rear of the motor housing 22 from which the cooling air is blown out.

[0049] Fig. 5Figure 1 shows a view of the underside of a preferred embodiment of the proposed machine tool 1. The motor 5 is arranged in a front region of the main body 4 of the machine tool 1. It is surrounded by a motor housing 22. The movement generated by the motor 5 of the machine tool 1 is transmitted to the tool 25 of the machine tool 1 via drive means 26. A gearbox 23 of the machine tool is arranged between the drive means 26 and the motor 5, preferably also arranged within the motor housing 22. The drive means 26 can comprise or be formed by a belt. The cutting disc 25 of the cut-off grinder 1 is connected to the main body 4 of the cut-off grinder 1 via a cutting arm 24, with the belt 26 running at least partially parallel to the cutting arm 24 to transmit the movement of the motor 5 of the cut-off grinder 1. The accumulators 2, 3 are in Fig. 5not shown. By omitting them, the battery interface 18 and the connection contacts 19, which electrically and electronically connect the accumulators 2 and 3 to the machine tool 1, can be seen.

[0050] Fig. 6 Figure 1 shows an oblique rear view of a preferred embodiment of the proposed machine tool 1 without accumulators 2, 3, without gearbox 23, without protective frame 14 and without handles 12, 13. In particular, the following are shown in Fig. 6The damping means 15 are shown, which decouple the protective frame 14 and the handles 12, 13 from the vibrations generated during operation of the machine tool 1. The damping means 15 preferably comprise springs or are formed by springs. It is preferred, according to the invention, that the machine tool 1 has three damping means 15 or springs for vibration decoupling. This effectively prevents the transmission of vibrations to the user, in particular their hands, arms, and shoulders, thus enabling longer and healthier working with the machine tool 1. Furthermore, the illustration shows Fig. 6 the carrier unit 32, which is arranged within the main body 4 of the machine tool 1.

[0051] Fig. 7Figure 1 shows the inclination angle A between the motor and the cutting axis, as well as the inclination angle B by which the surface 10 of the housing 6 of the machine tool 1 is inclined. The inclination angle A can, for example, be between 10 and 30 degrees, while the inclination angle B is approximately 5 degrees. Reference symbol list

[0052] 1 Machine tool 2 First battery 3 Second battery 4 Main body 5 Motor 6 Housing 7 First holding chamber 8 Second holding chamber 9 Rear of main body 10 Top of housing 11 Ribs 12 First circumferential handle 13 Second upper handle 14 Protective frame 15 Damping element 16 L-shaped structure 17 Projection 18 Interface between batteries and machine tool 19 Contacts between batteries and machine tool 20 Electronics of the machine tool 21 Operating switch 22 Motor housing 23 Gearbox 24 Cutting arm 25 Tool or cutting disc 26 Drive element or belt 27 Front of housing 28 Protective plate 29 Longitudinal axis of the machine tool 30 Switch-on lock 31 Charge level indicator 32 Support unit A Angle of inclination between motor and cutting axis B Inclination of the surface of the main body machine tool

Claims

1. Power tool (1) comprising a first rechargeable battery (2) and a second rechargeable battery (3) as energy sources, and a main body (4) and a motor (5), wherein the main body (4) has a first receiving space (7) for receiving the first rechargeable battery (2), and a second receiving space (8) for receiving the second rechargeable battery (3), wherein the receiving spaces (7, 8) are arranged in such a way within a housing (6) of the main body (4) that the rechargeable batteries (2, 3) are accessible and replaceable from a rear side (9) of the main body (4), wherein the receiving spaces (7, 8) for the rechargeable batteries (2, 3) form a lower boundary of the main body (4) of the power tool (1), wherein an upper side (10) of the housing (6) of the main body (4) of the power tool (1) is designed to slope in order to ensure that liquid runs off in a defined manner, characterized in that the upper side (10) of the housing (6) has ribs (11) in order to ensure that liquid runs off in a defined manner.

2. Power tool (1) according to one of the preceding claims, characterized in that the power tool (1) does not require an additional flap or an additional cover to protect the rechargeable batteries (2, 3) from liquid.

3. Power tool (1) according to one of the preceding claims, characterized in that the power tool (1) comprises a first, circumferential handle (12), and a second, upper handle (13), and a protection frame (14) for protecting the main body (4) of the power tool (1).

4. Power tool (1) according to Claim 3, characterized in that the power tool (1) has damping means (15) in order to decouple the handles (12, 13) and the protection frame (14) from vibrations which arise during operation of the power tool (1).

5. Power tool (1) according to Claim 3 or 4, characterized in that the protection frame (14) has an L-shaped structure (16).

6. Power tool (1) according to one of Claims 3 to 5, characterized in that the second handle (13) projects beyond the main body (4) of the power tool (1) in a rearward spatial direction and thus forms an overlap (17).

7. Power tool (1) according to one of the preceding claims, characterized in that the motor (5) of the power tool (1) is oriented transversely to the rechargeable batteries (2, 3).

8. Power tool (1) according to one of the preceding claims, characterized in that the power tool (1) is a cut-off grinder9. Power tool (1) according to one of the preceding claims, characterized in that the rechargeable batteries (2, 3) can be connected to electronics (20) of the power tool (1) via an interface (18) and contacts (19).

10. Machine tool (1) according to Claim 9, if at least dependent on Claim 3, characterized in that the second handle (13) above the electronics (20) of the power tool (1) comprises for the power tool (1).

11. Power tool (1) according to one of the preceding claims, characterized in that the power tool (1) comprises a motor housing (22), wherein the motor housing (22) comprises a transmission (23) of the power tool (1), a cutting arm (24) for a tool (25) of the power tool (1) and at least one means (26) for driving the tool (25).

12. Power tool (1) according to Claim 11, characterized in that the at least one means (26) for driving the tool (25) of the power tool (1) runs at least partially parallel to the cutting arm (24).

13. Power tool (1) according to one of the preceding claims, characterized in that the power tool (1) comprises at least one guard plate (28) on a front side (27) of the housing (6) of the main body (4) of the power tool (1) in order to protect the power tool (1).