Device for surface processing

Abstract

Device for processing surfaces, in particular floors, comprising a tool mechanism (4) with a base part and at least one tool (5a, 5b) movable relative to the base part, a tool motor (3) for driving the tool (5a, 5b) and a guide device (2) for guiding the device by a person, characterized by a support device (20) which is arranged or can be arranged on the tool mechanism (4) such that the device (1) can be supported on the surface by the support device (20) in the area of ​​a first side of the tool mechanism (4), while the device (1) can be supported on the surface by the at least one tool (5a, 5b) in the area of ​​a second side of the tool mechanism (4) opposite the first side.

Description

Technical area

[0001] The invention relates to a device for working surfaces, in particular floors. It comprises a tool mechanism with a base part and at least one tool movable relative to the base part, a tool motor for driving the tool, and a guide device for guiding the device by a person. State of the art

[0002] Such a device is known from WO 2022 / 148802 A1 (Gamartec AG). It comprises at least two tools movable relative to the tool mechanism. The device is designed such that, in a working position, it is in direct contact with the surface exclusively through the tools. The tool mechanism comprises a circular translational movement path for each of the tools, with the movement paths of the tools arranged in pairs running in opposite directions. Furthermore, the device is designed such that, during normal operation of the device, the tools move along the circular translational movement path at a cutting speed of at least 100 m / min.

[0003] The device is particularly suitable for sanding floor coverings, such as parquet flooring. It features a flat, rectangular working surface, which enables consistent work results. The device can also be used to sand hard-to-reach areas of surfaces, such as edges, narrow spaces, corners, or geometrically complex areas, and the device can be guided and controlled even in such areas.

[0004] However, many floor coverings rise slightly, particularly in the edge area towards the wall. If the floor covering is sanded in this area, especially with a sanding machine like this with a rectangular working surface, a depression can occur on the room side, at a distance from the wall that essentially corresponds to the working width of the device, because the rise of the surface towards the wall leads to a lateral incline of the machine's working surface. Unevenness such as this type of depression is undesirable. Accordingly, the edge areas are often first worked on separately today, with relatively small hand-held sanding machines, before the surface is then worked on with the parquet sanding machine. This upstream work step is time-consuming, and the prolonged use of hand-held machines on floors is unergonomic and tiring for the user. Description of the invention

[0005] The object of the invention is to create a device belonging to the technical field mentioned at the outset, which enables uniform processing in a simple manner even in edge areas.

[0006] The solution to the problem is defined by the features of claim 1. According to the invention, the device comprises a support device which is arranged or can be arranged on the tool mechanism in such a way that the device can be supported on the surface by the support device in the region of a first side of the tool mechanism, while the device can be supported on the surface by the at least one tool in the region of a second side of the tool mechanism opposite the first side.

[0007] A tool refers to an element of the device used to machine a surface. This tool moves simultaneously relative to the base of the tool mechanism and the surface. The movement of the tool relative to the surface serves to machine the surface.

[0008] The guide device is designed such that a person can guide the device through the guide device. For example, a guide device can comprise elements such as brackets, handles, or handlebars, or similar structures.

[0009] During the processing process, the device is moved by the person, specifically in a processing direction. The processing direction refers to the direction in which the device is moved while processing the surface in order to process different areas of the surface sequentially, both temporally and spatially. The processing direction runs parallel to the surface.

[0010] The guide device can be arranged upstream in the processing direction, downstream in the processing direction, or at an angle to the processing direction. The arrangement is preferably upstream, meaning the tool mechanism is pushed with the guide device. For this purpose, the guide device can have a drawbar parallel to the processing direction, at the free end of which the aforementioned elements for handling by the person are arranged.

[0011] The tool motor is, in particular, an electric motor and can be designed as a conventional AC motor. In particular, the tool motor is designed as a BLDC motor.

[0012] In particular, the device comprises an adjustable control for a frequency of the tool motor (i.e. for a number of revolutions of a drive axis per second).

[0013] The first side and the second side of the tool mechanism are located opposite each other in particular with respect to a center line of the tool mechanism, the center line running in the machining direction.

[0014] The surface to be machined is essentially flat or level, meaning it is flat apart from minor unevenness. However, the surface to be machined can also be slightly curved. The surface can be essentially horizontal. It can also be slightly inclined (for example, up to a maximum of 10° from the horizontal).

[0015] A processing step can be or include, for example, sanding (coarse sanding, fine sanding, sanding with abrasives of different grit sizes, i.e., different grits), polishing in, for example, oils, waxes, surface treatment agents or care products, as well as other surface treatments. Processing steps can therefore be understood as machining steps (such as sanding) and / or care steps (polishing, waxing). An appropriate tool is used in a surface processing step. The processing steps can be applied in particular to wooden floor coverings, namely parquet. They serve to prepare the floor covering surface, but can also be used, for example, to remove old paint, e.g., with adhesives. In particular, however, cleaning surfaces is not understood as surface processing.

[0016] The device can be suitable for selectively performing different processing steps. To switch between different processing steps, in particular, the at least one tool is changed.

[0017] The support device makes it possible to support the device on one side independently of the tool. This means that even with a tool with a flat processing surface, areas of the surface that have certain unevenness can be processed, in particular edge areas of floor coverings, which often rise slightly compared to the main central area. For example, in a process for processing an edge area of ​​a floor covering, the support device is arranged on the side of the tool mechanism opposite the edge in such a way that the device is supported on the floor covering on this side via the support device, while on the edge side it is supported on the floor directly via the tool. The height of the support device is then selected in particular so that the tool on the side with the support device has no contact with the floor covering in a certain area.

[0018] In a preferred embodiment, the support device is arranged or can be arranged on the tool mechanism in such a way that the device can be operated selectively with a first configuration of the support device in a first operating mode, in which the device is supported on the surface by the support device in the region of the first side and the device is supported on the surface by the at least one tool in the region of the second side, and with a second configuration of the support device in a second operating mode, in which the device is supported on the surface by the at least one tool both in the region of the first side and in the region of the second side.

[0019] The device can thus be used both for machining the flat areas of the surface - and after arranging or activating the support device - for machining non-flat surface areas, e.g. edge areas.

[0020] In certain embodiments, switching between the first configuration and the second configuration is possible by attaching or removing the support device to or from the tool mechanism.

[0021] The support device can be connected to the tool mechanism by suitable means, e.g. by means of screws or snap connectors, by plugging or hanging.

[0022] A support device can also be used to retrofit existing machining devices. For this purpose, the support device is temporarily or permanently attached to the machining device, using existing or retrofitted attachment points.

[0023] In further embodiments, a change between the first configuration and the second configuration is made possible by a relative movement between the support device and the tool mechanism, wherein the support device can remain arranged on the tool mechanism both in the first configuration and in the second configuration.

[0024] The relative movement is, for example, a pivoting or rotating movement or a shifting movement along one or more straight and / or curved path sections.

[0025] Certain embodiments allow both the removal and reattachment of the support device, e.g., to change the side to be supported, and the configuration change by means of relative movement, e.g., to quickly switch between configurations.

[0026] The support device advantageously comprises a height adjustment device for adjusting the height of the tool mechanism in the area of ​​the first side. This enables adaptation of the working geometry to different tools, e.g., grinding plates of different thicknesses and / or different geometries of the surface to be machined. The height adjustment device can be implemented using adjusting screws or spindles, other adjustment mechanisms, or spacer washers that can be placed underneath. It is arranged in particular on the support device itself and / or at the attachment point between the support device and the tool mechanism. In principle, however, it is also possible to provide height-adjustable fastening means on the tool mechanism itself for attaching the support device.

[0027] The support device preferably comprises at least one roller, in particular at least two swivel rollers, for support on the surface. This enables safe operation with minimal thrust resistance. The swivel rollers also allow the same support device to be attached or used on both sides of the device.

[0028] Instead of or in addition to rollers, sliding elements, such as runners, can also be used.

[0029] Advantageously, the device can be supported on the surface either in the first side or in the second side by the support device. This allows the working direction of the device in relation to the surface or its edge areas to be flexibly selected. Since additional support is only ever required on one side at most, a single support device is sufficient, which reduces the design effort.

[0030] The device advantageously comprises a cover in the region of the first and / or second side, wherein the cover can be optionally attached to or removed from the tool mechanism. Among other things, the cover can prevent damage to objects, e.g., walls, if the device comes into contact with them. Furthermore, it can laterally close off the space below the device, thus assisting the extraction of chips and dust by means of a suction device opening into this space.

[0031] Preferably, the support device comprises a cover area which, in the first configuration, performs a function of the cover, ie the cover on the relevant side is removed or moved away before the mounting or activation of the support device and the cover area of ​​the support device performs a role of the cover after the mounting or activation, in particular with regard to the lateral closure of an extraction chamber.

[0032] Preferably, the at least one tool comprises a flat grinding surface, wherein the at least one tool is movable relative to the base part of the tool mechanism in a plane of the grinding surface.

[0033] Preferably, the at least one tool defines a substantially rectangular machining surface.

[0034] Such tools enable uniform and efficient machining of large surfaces, but benefit considerably from the possibility of lateral lifting for machining non-planar surface areas, e.g. edge areas.

[0035] For example, the tools can be designed so that they can be easily removed from and reattached to the tool mechanism. This allows for quick and easy tool replacement, allowing for versatile use of the device and simplifying its maintenance, repair, and upkeep.

[0036] The tools are, in particular, plate-shaped tools, e.g., sanding plates. Different tools with different grits for sanding and / or tools with fastening devices for attachments with different active surfaces can be attached to the base part of the tool mechanism. For example, an attachment with the other half of a Velcro fastener can be attached to a tool with a first half of a Velcro fastener, whereby the attachment is, for example, a plastic pad for polishing or waxing a surface. Attachments with active surfaces for sanding can also be used. The fastening devices for the attachments can also be designed as snap fasteners, zippers, elastic or non-elastic fastening means such as rubber bands, cords, wire, hooks, eyelets, screws and the like.The fastening methods can, for example, result in a secure connection between the attachment and the tool through clamping, adhesion, snapping, wrapping, and / or screwing. The working position refers to a spatial arrangement and functional state of the device in which the device is capable of processing the surface. In other words, the device is in its working position during normal operation. Normal operation refers to the state of the device during its intended use, i.e., during the processing of a surface.

[0037] In a preferred embodiment, the tool mechanism comprises at least two tools, with the movement paths of the tools arranged in pairs running in opposite directions. The tool mechanism can, in particular, also comprise four tools or a higher, even number of tools.

[0038] The tool's trajectory is the spatial track or path along which the tool is moved during normal operation when machining the surface.

[0039] A pairwise counter-rotating arrangement of the tool trajectories means that the tools, viewed in pairs, each have trajectories that allow the tools to move in opposite directions during normal operation. This results in mutual compensation of the moments of motion (i.e. the momentum or the physical moment) of a tool pair during normal operation. The movements of all tools in a device are aligned in such an opposite direction that the sum of all forces acting on all tools from the surface to be machined, as well as the moments of the tools, is zero at any time when the device is not moving. In other words: if the device itself remains spatially in the same location, but the tools are driven and moved as in normal operation, all forces of the driven tools balance each other out.

[0040] The tools therefore move in opposite directions, which allows the device to be operated free from vibrations and disruptive forces (by preventing imbalance, twist and other forces that occur, for example, with rotating discs such as those found in single-disk grinding machines).

[0041] In these devices, the movement path for each of the tools is preferably circular and translational.

[0042] The tool mechanism redirects the force from the drive movement of the tool motor to the movements of the tools along a circular, translational trajectory. This is also referred to as oscillating motion or oscillation. For example, the tool mechanism can include one or more eccentrics that redirect the rotary drive movement of the tool motor (i.e., a rotational movement of the drive axis of the tool motor) into oscillating movements of the tools.

[0043] Through an oscillating motion, i.e., a circular, translational trajectory, the surface can be machined with tools moving at a constant cutting speed. This allows for uniform surface machining, thus achieving high machining quality.

[0044] A circular, translational motion path also ensures that, for example, the surface of wooden floors is always processed in all directions relative to the wood grain. This enables even processing without excessive wood removal in any particular direction relative to the wood grain.

[0045] Preferably, such devices are also designed such that, during normal operation of the device, the tools move along the circular translational movement path at a cutting speed of at least 100 m / min.

[0046] The cutting speed of the tools is defined as the speed at which the tool is moved across the surface at which the tools are in contact. In other words, the cutting speed is the speed at which the tool is moved across the surface to be machined. The cutting speed is the maximum speed the tool can achieve along its trajectory during normal operation.

[0047] With a circular movement of the tools, the cutting speed can remain constant.

[0048] For example, the cutting speed of a tool along a circular translational movement path with a diameter of 20 mm (which corresponds to a tool stroke of 20 mm, i.e. 0.02 m), which is moved at 3200 revolutions per minute (i.e. 53.3 Hz), is: 0.02 m x Pi x 3200 min 1= 200 m / min. The cutting speed of the device according to the invention is at least 100 m / min during normal operation. In particular, it is at least 150 m / min. It can also be at least 200 m / min.

[0049] In particular, all points of each individual tool that is in contact with the surface during normal operation always exhibit the same cutting speed. In other words, the tools are moved translationally and at a constant speed along their circular trajectory.

[0050] The comparatively high cutting speed of at least 100 m / min allows for simultaneous rough and fine grinding with the same device. In other words, this allows for both high material removal and high machining quality. This allows surfaces to be machined with high efficiency, high speed, and without the grooves or grinding marks that would be the case with rough grinding.

[0051] Due to the high cutting speed, other processing steps besides fine and coarse grinding can also be performed with the inventive device. For example, surface treatment can be advantageously carried out with this device. By carefully selecting the tools for surface treatment, frictional heat and ultimately a certain elevated temperature can be generated via the high cutting speed. This enables high processing speed and high surface quality after surface treatment.

[0052] As an optional feature, the trajectory for each tool includes a tool stroke of at least 10 mm. The tool stroke along the trajectory can be at least 15 mm. In particular, the stroke is 20 mm. A 20 mm stroke combined with a cutting speed of at least 200 m / min has achieved good results in trials. The large stroke enables high cutting speeds for the tools and the resulting advantages.

[0053] As an optional feature, the device is designed such that the tools are capable of moving along their trajectory at a frequency of at least 2000 revolutions per minute during normal operation. The tools can be moved along their trajectory at a frequency of at least 2500 revolutions per minute during normal operation. In particular, the tools are moved along their trajectory at a frequency of at least 3000 revolutions per minute during normal operation.

[0054] A revolution refers to a complete cycle of a tool's movement along its trajectory until the tool returns to the same point in its cycle. In the case of a circular translational trajectory, this represents a complete revolution along the trajectory. The high frequency enables high cutting speeds of the tools and the resulting advantages.

[0055] As an optional feature, the fixture has a weight of at least 50 kg. During normal operation, this weight is applied by the tools to the surface in direct contact with it. In particular, the fixture has a weight of at least 80 kg. The fixture can weigh at least 120 kg.

[0056] A device with a weight of at least 80 kg and a stroke of 20 mm in combination with a cutting speed of at least 200 m / min has achieved good results in tests.

[0057] The high weight of at least 50 kg compared to state-of-the-art technology, combined with the high cutting speed, enables high material removal during surface processing while maintaining high processing quality. This allows the surface to be processed quickly and efficiently, while maintaining high quality.

[0058] Optionally, the device can be designed to accommodate an additional weight. To further weight the device, the device can have fixing points for a separately designed additional weight.

[0059] As an optional feature, the tools of the device have a total of at least 0.05 m 2 large processing area. This processing area is in direct contact with the surface to be processed during normal operation. The processing area can also be at least 0.1 m 2 In particular, the working area must be at least 0.14 m 2 large. A large processing area, in conjunction with the other features of the device according to the invention, can enable high efficiency in surface processing.

[0060] As an optional feature, the device has a rotating device. The rotating device is designed in such a way that it allows the tool mechanism to be rotated relative to the guide device about an axis that is essentially perpendicular to the surface. The rotating device allows the tool mechanism and thus also the tools to be rotated relative to the guide device. The rotation takes place essentially parallel to the surface to be worked on. This allows the device to be moved, for example, along walls by a person on the guide device. The guide device can be rotated with respect to the processing direction in which the device is guided. The rotation of the tool mechanism relative to the guide device can take place clockwise relative to the processing direction.The rotation of the tool mechanism relative to the guide device can also occur clockwise relative to the machining direction. Depending on the design of the rotating device, rotation can occur in both directions or exclusively in one direction. For example, the rotating device can be designed such that it is capable of rotating the tool mechanism relative to the guide device while the tools are machining the surface.

[0061] A method for treating surfaces, in particular floors, in particular with a device according to the invention as described above, comprises the following steps: a) Providing a device comprising a tool mechanism with a base part and at least one tool movable relative to the base part, a tool motor for driving the tool, a guide device for guiding the device by a person and a support device; b) machining at least one partial area of ​​the surface, wherein the device is supported on the surface by the support device in the area of ​​a first side of the tool mechanism, while the device is simultaneously supported on the surface by the at least one tool in the area of ​​a second side of the tool mechanism opposite the first side.

[0062] If a device is used which can be operated in two operating modes as described above, preferably a first partial area of ​​the surface is first machined with a first configuration of the support device, in which the device is supported on the surface by the support device in the area of ​​the first side and the device is supported on the surface by the at least one tool in the area of ​​the second side, and a second partial area of ​​the surface is machined with a second configuration of the support device, in which the device is supported on the surface by the at least one tool in both the area of ​​the first side and the area of ​​the second side.

[0063] The first sub-area, for example, covers the areas of a floor covering closest to the wall, while the second sub-area essentially covers the entire floor covering surface. Thus, the areas closest to the wall are first sanded flat, and then the entire floor covering can be evenly processed. The device, which can be operated in two modes, thus enables the floor covering to be processed from rough sanding to fine sanding, including the edges.

[0064] Further advantageous embodiments and combinations of features of the invention emerge from the following detailed description and the entirety of the patent claims. Short description of the drawings

[0065] The drawings used to explain the embodiment show: Fig. 1A, B oblique views of an embodiment of a device according to the invention; Fig. 2A, B the device according to the invention with the protective strips removed; Fig. 3 a support carriage of the device according to the invention; Fig. 4A, B the device according to the invention with attached support carriage; Fig. 5 a vertical section through the device according to the invention; Fig. 6 a view of the underside of the device according to the invention; and Fig. 7A-C schematic representations of the processing situation of an edge area of ​​a floor covering.

[0066] In principle, identical parts in the figures are provided with identical reference symbols. Ways to implement the invention

[0067] The Fig. 1A, Fig. 1B are oblique views of an embodiment of a device according to the invention. Fig. Figure 5 shows a vertical section through the device according to the invention, with the cutting plane running centrally along the machining direction. Fig. Figure 6 is a view of the underside of the device according to the invention, with the tools 5a, 5b visible. Several aspects of the device, particularly with regard to the drive of the tools, are already known from the previously published WO 2022 / 148802 A1 (Gamartec AG), to which reference is hereby made. Fig. 5 and Fig. 6 show a variant of the embodiment which differs in minor details from that shown in the Fig. 1, Fig. 2 and Fig. 4. However, these deviations are not relevant to the present invention.

[0068] The device 1 comprises a guide device 2, a tool motor 3 and a tool mechanism 4. Between the tool mechanism 4 and the tool motor 3 there is a rotating device 6 (cf. Fig. 5) comprising a plastic plain bearing. Thus, the tool mechanism 4 and the tool motor 3 are connected to each other by the rotating device 6 so that they can rotate relative to each other.

[0069] The rotating device 6 is thus arranged between the tool mechanism 4 on the one hand and the tool motor 3 and the guide device 2 arranged so as to rotate therewith on the other hand. The rotating device 6 is designed as a plastic plain bearing, which has the aforementioned axis a of the rotating device 6 as its axis of rotation. The outer part of the plastic plain bearing is fixedly connected to the tool mechanism 4 with respect to the axis a of the rotating device 6, and the inner part (closer to the axis a) of the plastic plain bearing is fixedly connected to the tool motor 3 and the guide device 2 with respect to the axis a of the rotating device 6. The rotating device 6 allows rotation of the tool mechanism 4 about an axis a arranged perpendicular to a surface to be machined, for example a floor (shown by a broken line). The guide device 2 is arranged so as to rotate with respect to the tool motor 3 with respect to the axis a of the rotating device 6.Tool motor 3 and guide device 2 are also arranged relative to the rotating device 6 and fastened thereto in such a way that the center of mass of tool motor 3, guide device 2 and rotating device 6 as well as their connecting elements lies essentially on the axis a in a working position of the device 1.

[0070] The tool motor 3 is a BLDC electric motor which can be operated at a controllable frequency (revolutions of a drive axis per second) of 15 to 70 Hz.

[0071] The tool mechanism 4 comprises two tools 5a, 5b (clearly visible on Fig. 6), each of which has a rectangular effective area of ​​535 mm wide and 150 mm long. The tool mechanism 4 also includes an oscillating mechanism 7, which converts the rotary drive movement of the tool motor 3 into an oscillating movement of the tools 5a, 5b. The oscillating mechanism 7 thus transfers the power of the tool motor 3 to the two tools 5a, 5b, which oscillate in opposite directions due to the oscillating mechanism 7. The oscillating mechanism 7 prescribes the circular, translational movement path of the tools 5a, 5b, along which they move at a cutting speed of at least 100 m / min.

[0072] The tool mechanism 4 is rectangular in shape when projected onto the surface to be machined and is 600 mm wide at its widest point and 485 mm long at its longest point. The first tool 5a and the second tool 5b are connected to the tool mechanism 4 by a screw connection and can be exchanged quickly and easily. In this case, the first tool 5a and the second tool 5b are identical, i.e., they perform the same machining step for machining the surface. However, the first tool 5a can also perform a different machining step than the tool 5b. The tools 5a, 5b are, in particular, grinding wheels with a predetermined grain size.

[0073] The guide device 2 is designed as a handlebar-like machine handle 11 with two connecting struts 12a, 12b. The two connecting struts 12a, 12b are attached to the device 1 in a height-adjustable manner, so that the handlebar-like machine handle 11 can maintain an ergonomic distance from the surface to be machined when the device 1 is in the working position. Furthermore, a further adjustment position of the two connecting struts 12a, 12b (closer to axis a) allows the device 1 to adopt a compact and easy-to-store and transport shape.

[0074] The handlebar-like machine handle 11 contains various controls for activating and deactivating the tool motor 3, adjusting the drawbar tilt, and switching the lighting on and off. Furthermore, an emergency stop switch is provided to immediately deactivate the device if necessary.

[0075] The device 1 has a control light 13 on each of two opposite sides, each of which illuminates the surface transversely to the machining direction. A handle 33 can be seen on the tool mechanism 4, and two transport wheels 35 are arranged opposite it.

[0076] A connection piece 8 for connecting a suction hose is located on the rear side of the tool mechanism 4. The connection piece 8 opens into the space between the tools 5a, 5b on the machine side. A connector plug 9 for connecting a power cable is also located on the rear side.

[0077] As with the device known from WO 2022 / 148802 A1, the tool motor 3 transmits its drive force at a drive point to the toothed side of a single-sided toothed belt. The drive point is connected to the tool motor 3 via a coupling, which can force-lockingly couple or decouple the tool motor 3 from the drive point. At the same time, the single-sided toothed belt 20 is tensioned to a pretension of 200 Nm by an adjustable tensioning device in the form of a gearwheel that can be displaced transversely to a direction of movement of the single-sided toothed belt. Via toothed belt pulleys that engage output points on the single-sided toothed belt, the drive force of the tool motor 3 is transmitted through the single-sided toothed belt to four eccentric toothed belt pulleys of the oscillating mechanism 7. The four eccentric toothed belt pulleys of the oscillating mechanism 7 all have the same direction of rotation. An eccentric disc is attached to each of the four eccentric toothed belt pulleys.The eccentric timing belt pulleys drive the eccentric pulley, which in turn drives the eccentric pulley. The output is via an eccentric output shaft, which is arranged parallel to the rotational axis of the eccentric timing belt pulleys and rotates around the rotational axis of the eccentric timing belt pulleys when the eccentric timing belt pulleys rotate.

[0078] Two of these eccentric output axes together drive a tool 5a, 5b as an eccentric axes pair, whereby the tools 5a, 5b execute an oscillating movement along a circular, translational path. A first eccentric axes pair, which moves the first tool 5a, moves 180 degrees out of phase with a second eccentric axes pair, which moves the second tool 5b. Due to this 180-degree phase shift of the eccentric axes pairs, the tools 5a, 5b oscillate in opposite directions to one another. The tools 5a, 5b oscillate in an oscillating circuit with a diameter of 20 mm, whereby the tools 5a, 5b achieve a working width (i.e. a width of the surface that is machined by the tools 5a, 5b) of 555 mm (i.e. the sum of the width of the tool plate of 535 mm and the stroke of 20 mm). The tools 5a, 5b together have a machining area of ​​0.16 m 2(the sum of two panels, each 535 mm wide and 150 mm long). The entire weight of fixture 1, totaling 80 kg, rests on this processing surface. One or two separately constructed, not shown, additional weights of 20 kg each can be stacked on fixture 1. Depending on the application and the available power supply, the weight can thus be varied between 80 kg, 100 kg, and 120 kg.

[0079] The housing of the tool mechanism 4 has a circumferential recess 4a with a rectangular base in its lower area. A non-driven corner roller 14, which rotates around a vertical axis, is arranged in each corner of this recess 4a. The outer surface of the corner rollers 14 is made of a soft material to prevent damage if the device comes into contact with objects, such as walls, during operation. Two protective strips 15 are also arranged on the side surfaces of the recess 4a.

[0080] Due to paragraph 4a, the device 1 has a low height in its edge area so that surfaces underneath protruding objects, e.g. in the area of ​​furniture bases, can also be processed.

[0081] In the operating position, the device 1 is guided and controlled by a person on the guide device 2. This person can control the speed at which the tools 5a, 5b oscillate in opposing motions relative to each other, thus processing the surface. Due to the transmission ratios of all power transmission elements between the tool motor 3 and the tools 5a, 5b, the tools 5a, 5b oscillate at 500 to 3100 revolutions per minute. The number of revolutions per minute is continuously variable and can be adjusted according to the requirements of the work steps.

[0082] The Fig. 2A, Fig. 2B shows the device according to the invention with the side protective strips removed. The protective strips 15 are attached to the shoulder 4a with a clip connection and can thus be easily removed and reattached. When attached, they prevent damage to objects, such as walls, if the device comes into contact with them. They also laterally seal off the space below the device, particularly between the tools 5a, 5b, thus assisting the extraction of chips and dust using a suction hose connected to the connection piece 8.

[0083] The Fig. Figure 3 shows a support carriage of the device according to the invention. The support carriage 20 comprises a base part 21, which is designed as an L-profile. Two swivel double rollers 23 are mounted on the base part 21, on the side of the downwardly projecting section of the L-profile, via outriggers 22. These rollers can pivot about parallel vertical axes. On the top side of the base part 21, a through-opening is provided at each end, in which a knurled screw 24 is received.

[0084] The Fig. 4A, Fig. 4B shows the device according to the invention with the support carriage attached. The support carriage 20 is symmetrical due to the 360° pivoting rollers and can thus be attached either to the left or right side of the shoulder 4a of the tool mechanism 4. To do so, first remove the protective strip on the corresponding side. The support carriage 20 can then be pushed on and secured by screwing the knurled screws 24 into the threaded openings 4b (see FIG. Fig. 2a, Fig. 2b) be fixed on paragraph 4 so that the situation is in accordance with the Fig. 4A, Fig. 4B. The height of the swivel double casters 23 can be adjusted using a height adjustment mechanism in the area where the casters are attached.

[0085] The Fig. 7A-7C are schematic representations of the processing situation of an edge area of ​​a floor covering. The geometry of the surface to be processed and the adjacent wall area is schematically represented by the cross-section 50, whereby it should be noted that the unevenness is shown significantly exaggerated so that the principle of the invention is more clearly visible. The floor covering rises slightly in the edge area, towards the wall. If a conventional processing device with a flat tool 5 is used, this has - as can be seen from Fig. 7A - has the consequence that the floor covering is machined in a wall area 51, directly adjacent to the wall, and in an area 52 spaced from the wall by the width of the tool. This machining has - as can be seen from the Fig. 7B - has the consequence that an undesirable depression 53 is formed in the spaced region 52, while an area between the wall region 51 and the spaced region 52 may not be machined at all.

[0086] The Fig.7C now shows the situation when, during processing, the side of the device according to the invention facing away from the wall is supported on the surface by an additional support device (e.g., the support carriage described). The tool 5 is oriented parallel to the desired floor covering surface. In an abrasive process, the floor covering is first processed in the wall area 51, while the tool 5 is not in contact with the surface in the spaced-off area 52. In this way, the rising area can initially be completely or partially removed. In a further processing step, possibly after attaching the protective strip(s), the entire, now largely flat, surface of the floor covering is then processed without a support device. QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] WO 2022 / 148802 A1 [0002, 0067, 0077]

Claims

[1] Device for working surfaces, in particular floors, comprising a tool mechanism (4) with a base part and at least one tool (5a, 5b) movable relative to the base part, a tool motor (3) for driving the tool (5a, 5b) and a guide device (2) for guiding the device by a person, characterized by a support device (20) which is arranged or can be arranged on the tool mechanism (4) in such a way that the device (1) can be supported on the surface by the support device (20) in the region of a first side of the tool mechanism (4), while the device (1) can be supported on the surface by the at least one tool (5a, 5b) in the region of a second side of the tool mechanism (4) opposite the first side. [2] Device according to claim 1, characterized bythat the support device (20) is arranged or can be arranged on the tool mechanism in such a way that the device can be operated selectively with a first configuration of the support device (20) in a first operating mode, in which the device (1) is supported on the surface by the support device (20) in the region of the first side and the device (1) is supported on the surface by the at least one tool (5a, 5b) in the region of the second side, and with a second configuration of the support device (20) in a second operating mode, in which the device (1) is supported on the surface both in the region of the first side and in the region of the second side by the at least one tool (5a, 5b). [3] Device according to claim 2, characterized bythat a change between the first configuration and the second configuration is possible by attaching or removing the support device (20) to or from the tool mechanism (4). [4] Device according to claim 2 or 3, characterized by that a change between the first configuration and the second configuration is made possible by a relative movement between the support device and the tool mechanism, wherein the support device can remain arranged on the tool mechanism both in the first configuration and in the second configuration. [5] Device according to one of claims 1 to 4, characterized by that the support device (20) comprises a height adjustment device for adjusting a height of the tool mechanism (4) in the region of the first side. [6] Device according to one of claims 1 to 5, characterized bythat the support device (20) comprises at least one roller, in particular at least two swivel rollers (23), for support on the surface. [7] Device according to one of claims 1 to 6, characterized by that the device (1) can be supported on the surface by the support device (20) either in the region of the first side or in the region of the second side. [8] Device according to one of claims 1 to 7, characterized by a cover (15) in the region of the first and / or the second side, wherein the cover (15) is selectively attachable to or removable from the tool mechanism (4). [9] Device according to claim 8, characterized by that the support device (20) comprises a cover area which, in the first configuration, performs a function of the cover (15). [10] Device according to one of claims 1 to 9, characterized bythat the at least one tool (5a, 5b) comprises a flat grinding surface, wherein the at least one tool (5a, 5b) is movable relative to the base part of the tool mechanism (4) in a plane of the grinding surface. [11] Device according to claim 10, characterized by that the at least one tool (5a, 5b) defines a substantially rectangular machining surface. [12] Device according to claim 10 or 11, characterized by that the tool mechanism (4) comprises at least two tools (5a, 5b) and that movement paths of the tools (5a, 5b) are arranged in pairs running in opposite directions. [13] Device according to claim 12, characterized by that the movement path for each of the tools (5a, 5b) is circularly translational. [14] Device according to claim 13, characterized bythat the device (1) is designed such that in normal operation of the device (1) the tools (5a, 5b) move along the circular translational movement path at a cutting speed of at least 100 m / min.

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