EP4289553A1 - Appareil outil électrique doté d'un outil rotatif - Google Patents

Appareil outil électrique doté d'un outil rotatif Download PDF

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Publication number
EP4289553A1
EP4289553A1 EP22177433.4A EP22177433A EP4289553A1 EP 4289553 A1 EP4289553 A1 EP 4289553A1 EP 22177433 A EP22177433 A EP 22177433A EP 4289553 A1 EP4289553 A1 EP 4289553A1
Authority
EP
European Patent Office
Prior art keywords
power tool
tool
rotation
dust hood
tool device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22177433.4A
Other languages
German (de)
English (en)
Inventor
Michael Fuchs
Thomas Blatz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP22177433.4A priority Critical patent/EP4289553A1/fr
Publication of EP4289553A1 publication Critical patent/EP4289553A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor

Definitions

  • the present invention relates to a power tool device with a rotating tool, wherein the tool of the power tool device can be driven in a first direction of rotation or in a second direction of rotation.
  • the direction of rotation of the tool can be adjusted on the power tool, depending on the presence of a dust hood on the power tool, on a type of dust hood arranged on the power tool and / or on an application of the power tool and its associated position in space.
  • the direction of rotation of the tool of the power tool device can be adjusted depending on a position of a switch for selecting a direction of rotation of the tool of the power tool device.
  • Electric tool devices are known in the prior art with which surfaces can be processed or substrates can be cut through. These power tool devices usually have a rotating tool, such as a cutting wheel, a cutting blade or a cutting blade.
  • the power tool devices known from the prior art are usually characterized in that they have a firmly defined direction of rotation of the tool. For the purposes of the invention, this direction of rotation of the tool can preferably also be referred to as the direction of rotation.
  • the fixed direction of rotation of the tool of the power tool greatly limits the user-friendliness of the power tool in that the power tool can only be used well for certain applications, namely for those tasks that can be carried out particularly well with the specified direction of rotation of the tool. For all other tasks, working with a conventional power tool with a fixed direction of rotation of the tool can be very strenuous or, for example, involve the user being exposed to a high level of dust.
  • the object of the present invention is to overcome the disadvantages and shortcomings of the prior art described above and to provide a power tool device with a rotating tool with improved user-friendliness and a particularly wide range of applications.
  • the power tool device to be provided should in particular be able to be used particularly flexibly in various application situations. Furthermore, it is a concern of the invention to improve the extraction of the dust generated during operation of the power tool and the work efficiency of the power tool.
  • the power tool can be connected to a dust hood, the dust hood being designed to collect the dust generated during operation of the power tool and to keep it inside, so that the dust or the resulting air The dust mixture can be gradually sucked out from inside the dust hood using a suction device.
  • the dust hood has a suction nozzle, wherein the dust hood can be connected to a suction device, such as a vacuum cleaner, using the suction nozzle. If dust is generated during operation of the power tool, this dust can be removed from the working area of the power tool using the vacuum device by vacuuming the dust.
  • the power tool device has a rotating tool, such as a cutting or grinding wheel, with the tool advantageously being able to process a surface.
  • the direction of rotation of the tool of the power tool can be adjusted depending on whether such a dust hood is present on the power tool or not.
  • the direction of rotation of the tool can be adjusted depending on whether the presence of the dust hood on the power tool is detected or not.
  • the power tool device can have suitable sensors.
  • the dust hood can, for example, be designed to be removable, so that the dust hood can be attached or removed depending on the application of the power tool. In other words, the dust hood can be designed to be detachably connectable to the power tool.
  • the dust hood which is preferably designed to be removable, is recognized by the preferably electronically designed control or electronics of the power tool device.
  • the machine tool can be set up to detect whether a dust hood is arranged on the machine tool or not.
  • the presence or type of the dust hood can also be detected using a button that is actuated by the dust hood.
  • This actuation of a button can take place, for example, when the dust hood is connected to the power tool.
  • an actuation of such a button by the motor control of the power tool can be understood by the power tool to mean that a dust hood is present, and the direction of rotation of the tool of the power tool can then be adjusted accordingly.
  • the button can also be operated differently, depending on what type of dust cover is arranged on the power tool. As a result, different types of dust hoods can be distinguished or recognized, and the direction of rotation of the tool of the power tool device can then be adjusted accordingly.
  • the direction of rotation of the tool can be adjusted depending on which type of dust hood is arranged on the power tool.
  • type of dust hood can mean, for example, different dust hood products that can be used together, for example, with different machine tools.
  • type of dust hood can also mean different types of dust hoods, which, for example, have different functions. For example, there are so-called right-hand or left-hand rotation dust hoods, which are optimized for a direction of rotation of the tool of the power tool clockwise or counterclockwise.
  • the dust hood can, for example, also be optimized for both running directions, i.e. operation of the tool of the power tool both clockwise and counterclockwise.
  • sensors can be provided on the power tool that can detect the type of dust hood, so that the direction of rotation of the tool of the power tool can be adjusted based on this information. It is preferred in the sense of the invention that the power tool device is set up to recognize the type of dust hood used on the power tool device and, based on the recorded information, to adjust the direction of rotation of the tool of the power tool device in accordance with the recognized dust hood type.
  • the direction of rotation of the tool can be adjusted depending on what the power tool is used for.
  • the power tool device can be used on a floor or a subsurface, such an application being preferably referred to as “horizontal use of the power tool device” in the sense of the invention.
  • the power tool device can be used to work on a wall or on a wall, the wall and/or the wall being arranged essentially vertically on a floor or subsurface.
  • Such an application of the power tool device on a wall is preferably referred to as a “vertical application of the power tool device” in the sense of the invention.
  • the horizontal or vertical application of the power tool is preferably referred to as the “position of the power tool in space”.
  • the power tool device is set up to recognize an application of the power tool device and its associated position in space and, based on the recorded information, to adjust the direction of rotation of the tool of the power tool device in accordance with the position of the power tool device in space.
  • the direction of rotation of the tool can depend on a position of the switch for selecting the direction of rotation of the tool of the power tool device be set.
  • a selector switch can be provided on the power tool device, with which the direction of rotation of the tool can be adjusted depending on. The user can use the selector switch to adjust the direction of rotation of the tool.
  • the direction of rotation of the tool is then set, for example, clockwise or counterclockwise.
  • the user of the power tool is provided with the data that is provided with the means for detecting the dust hood, for detecting the type of dust hood, for detecting the use of the power tool and/or for detecting the position of the power tool in space recorded can be displayed.
  • the power tool device can include a display device.
  • the information displayed on the display device may, for example, be the data collected using the above-mentioned means.
  • these data recorded with the means are evaluated by control electronics or a control device of the power tool and that the evaluated data is displayed to the user on the display device.
  • dust extraction can be optimized in particular if the direction of rotation of the tool of the power tool and the type, ie the type, of the dust hood are coordinated with one another.
  • the present invention can make a significant contribution to this because, for example, the proposed power tool can be set up to detect whether a dust cover is connected to the power tool. Alternatively or additionally, the proposed power tool device can be set up to detect which type of dust cover is arranged on the power tool device.
  • Dust hoods can be designed, for example, to operate the tool of the power tool device in a first direction of rotation and/or in a second direction of rotation. In other words, this means that dust hoods can be used that can be optimized for a working movement of the tool of the power tool in a first direction of rotation.
  • the tool of the power tool is driven, for example, in a first direction of rotation by a motor of the power tool.
  • dust hoods that are optimized for a working movement of the tool of the power tool in a second direction of rotation can also be used.
  • the tool of the power tool device is preferably driven in a second direction of rotation that is opposite to the first direction of rotation.
  • the tool of the power tool device can rotate "clockwise" in the first direction of rotation, while the tool of the power tool device rotates "counterclockwise” in the second direction of rotation.
  • dust hoods can be used that are designed or optimized for operation in both rotational or working directions of the tool of the power tool device.
  • the dust cover can be designed for operation of the tool of the power tool device in a first direction of rotation and/or in a second direction of rotation.
  • the first direction of rotation can correspond, for example, to a working direction of the tool of the power tool in a clockwise direction
  • a second direction of rotation of the tool of the power tool corresponds, for example, to a working direction of the tool of the power tool in a counterclockwise direction.
  • the direction of rotation of the tool of the power tool can preferably depend on an application of the power tool be made dependent.
  • the machine tool can include means for detecting an application of the power tool and/or means for detecting the position of the power tool in space, which are formed, for example, by a position sensor and/or a gyro sensor. The data recorded with these means or sensors can be evaluated by a control device of the power tool and used as a basis for setting a direction of rotation of the tool of the power tool.
  • the machine tool is used on a floor or a flat surface.
  • Such an application of the power tool on a floor is preferably referred to as “horizontal use of the power tool” in the sense of the invention.
  • the machine tool is used on a wall.
  • Such an application of the power tool device on a wall is preferably referred to as a “vertical application of the power tool device” in the sense of the invention.
  • the power tool is in particular pushed when used horizontally, while the power tool is preferably pulled when used vertically.
  • the power tool device comprises means for detecting a dust hood, means for detecting a type of dust hood, means for detecting an application of the power tool device and/or means for detecting the position of the power tool device in space.
  • Information can be collected using the means mentioned or are recorded, which then form the basis for setting the direction of rotation of the tool of the power tool device.
  • the means for detecting the use of the power tool and/or the means for detecting the position of the power tool in space can preferably be formed by a position sensor and/or a gyro sensor.
  • the dust cover can comprise mechanical and/or electrical coding means.
  • Mechanical coding means can be formed, for example, by small elevations or depressions on the dust cover, notches, cuts or the like.
  • Electrical coding means can preferably also be referred to as “electronic coding means” and can, for example, include small areas of different conductivity or include small electronic components.
  • the electrical coding means can, for example, comprise at least one magnetic element, which can preferably be arranged on the dust hood. For example, several smaller magnets can be arranged on the dust hood and can interact with at least one Hall sensor that is arranged on the machine tool.
  • the Hall sensor can be connected to the control electronics of the machine tool and detect the magnets, their number and/or their position. The information collected by the Hall sensor can then be used to identify the dust hood or its type.
  • RFID radio frequency identification
  • NFC near field communication
  • the RFID tag and/or the NFC tag can be arranged on the dust hood, while the reading device is arranged in the area of the machine tool or is integrated on the machine tool or in the machine tool.
  • the reading device can be connected to the control electronics of the machine tool and receive the data sent by the RFID tag and/or the NFC tag. The information received with the reading device can then be used to identify the dust hood or its type.
  • a communication module could be arranged on the dust hood, which can communicate using Bluetooth, for example.
  • the control electronics of the machine tool can then be set up to detect and/or identify the dust hood via Bluetooth.
  • the above-mentioned detection means and/or the coding means can enable the power tool to preferably automatically adjust the direction of rotation of the tool of the power tool.
  • the invention is associated with the advantages that the ease of use and the productivity of the user of the power tool can be significantly increased by the invention.
  • the workflow with the power tool can advantageously be designed to be uninterrupted, so that the efficiency when working with the machine tool can be improved.
  • the quality of dust extraction can be improved with the invention.
  • the power tool device has a motor, which is preferably designed as a brushless motor. It represents a surprising innovation in the field of brushless motors that power tools can be provided in which the direction of rotation of the rotating tool can be adjusted.
  • the ability to adjust the direction of rotation of the power tool when using a brushless motor has the advantage that neither a gear is required to change the direction of rotation, as with an internal combustion engine, nor a mechanism for switching the commutation, as with a brush motor. This makes it possible to provide a particularly user-friendly and flexible power tool.
  • the term “adjustability of the direction of rotation of the power tool” preferably means that a direction of rotation of the tool of the power tool device can be set depending on the requirements of the task to be completed. For example, a direction of rotation “clockwise or clockwise” can be set. For other applications it may be preferred that the rotation direction is set "counterclockwise”.
  • the adjustability of the direction of rotation of the power tool preferably means that it is possible to switch back and forth between the two opposite directions of rotation "clockwise” and “counterclockwise”, depending on the preference of the user of the power tool. The switching can be effected, for example, by setting a switch.
  • the “clockwise” rotation direction is particularly preferred when using the power tool in conjunction with dust extraction.
  • the tool in a front area of the device preferably rotates away from the surface to be worked on or away from the user of the power tool device.
  • the shredded material to be cut can receive a movement impulse away from the user, so that the user is exposed to reduced dust exposure from the outset due to the direction of rotation of the tool of the power tool when the power tool is operated in the direction of rotation "clockwise”.
  • the material to be cut is transported away from the preferably smooth surface. This advantageously creates the prerequisites for improved and more complete suction.
  • the power tool interacts with a dust hood, which is designed to suck out the material to be cut produced when cutting or processing the surface and, for example, to remove it from a breathing area of the user of the power tool.
  • the tool rotates on the surface to be worked in the direction of the user of the power tool.
  • the direction of rotation of the tool supports the direction of movement of the user.
  • this adjustable direction of rotation of the tool or power tool is particularly advantageous for applications that are perceived as very stressful by the user. The stress can be caused, for example, by working with great force or by having to carry out time-consuming, long-lasting work.
  • operating the power tool in the “counterclockwise” rotation direction enables particularly comfortable work with the power tool that is physically less demanding for the user.
  • the user of the power tool can, depending on the application, set the optimal direction of rotation of the tool on the power tool and thus advantageously work with particularly little dust or with reduced physical strain.
  • cooling of the power tool device is designed to be essentially independent of the direction of rotation.
  • the cooling of the power tool operates independently of the direction of rotation of the tool of the power tool and that the functionality of the cooling is not influenced by switching the direction of rotation of the tool.
  • the cooling of the power tool device is set up in particular to protect components of the power tool device, such as the motor and/or power electronics, from overheating.
  • a fluid is guided past the components of the power tool to be cooled.
  • the fluid can preferably be a water-based fluid or a gas mixture, such as air.
  • the fluid is guided past the components of the power tool to be cooled in suitable pipes or channels, whereby, due to the temperature difference between the components to be cooled and the cooling fluid, heat is exchanged from the motor and/or line electronics in the direction of the cooling fluid. It was completely surprising that in the context of the present invention, cooling of the power tool device can also be provided that is independent of the direction of rotation.
  • the provision of essentially direction-independent cooling for the motor of the power tool can be made possible, for example, by using a fan in the area of cooling of the power tool, which preferably has no preferred direction.
  • this preferably means that the elements on the fan wheel, which serve to guide the cooling fluid, can be formed by straight ribs.
  • Straight cooling fins - unlike curved cooling fins - do not release the cooling fluid in a preferred direction, but in a substantially radial direction.
  • the cooling proposed in the context of the proposed power tool device can be designed to be essentially independent of the direction of rotation when using a fan wheel without a preferred direction, since in this way comprehensive cooling of the motor of the power tool device can be ensured in both operating directions of the tool.
  • this cooling capacity is essentially 100% for both directions of rotation of the tool.
  • a cooling capacity that is less than 100% can be set on the cooling system.
  • different cooling capacities can be set on the cooling of the power tool, in particular depending on the direction of rotation of the tool of the power tool. This can be advantageous in cases where a first operating mode of the power tool requires a lower cooling capacity than a second operating mode of the power tool.
  • a cooling capacity of less than 100% can be provided, for example, by using a fan in the cooling area of the power tool that has only a slightly pronounced preferred direction.
  • cooling to be 100% in the preferred direction when the tool of the electrical device is operated, for example, in a first direction of rotation Achieve cooling performance and in the non-preferred direction a lower cooling performance, which is, however, sufficient to achieve cooling of the electrical device when the tool of the electrical device is operated, for example, in a second direction of rotation.
  • cooling that is adapted to the requirements in this way should also fall under the term “cooling that is essentially independent of the direction of rotation” of the electrical device.
  • the power tool device includes a direction of rotation indicator.
  • the power tool device preferably comprises a display means for the direction of rotation of the tool of the power tool device.
  • the display medium can be, for example, a small display, a screen or a monitor.
  • the display means can be designed as a touchscreen or touchscreen, so that entries can advantageously be made by touching the user's finger or with a special pen.
  • the display means can also include, for example, lights or LEDs that are colored differently, for example. For example, an LED in color A may indicate the rotation direction "counterclockwise", while an LED in color B indicates the rotation direction "clockwise”.
  • the power tool is a cut-off machine, a diamond cut-off machine or an angle grinder.
  • the power tool device can also be referred to as a “machine tool” in the context of the present invention.
  • the invention relates in particular to cut-off machines, diamond cut-off machines or angle grinders, in which, in departure from the prior art, the direction of rotation of the tool can be switched depending on the requirements of the work to be done, the motor of the power tool preferably being a brushless motor.
  • a choice can be made between the directions of rotation “clockwise” and “counterclockwise” or these directions of rotation can preferably be set automatically by the machine tool itself.
  • the power tool device can, for example, comprise a switch device.
  • a switch device can be, for example, a toggle switch or a slide switch, which preferably allows two switching positions.
  • each switch position corresponds to a direction of rotation of the power tool.
  • the invention relates to a cut-off or angle grinder, the drive being implemented with a brushless motor.
  • the tool of the cutting or angle grinder is preferably equipped with a direction of rotation that can be selected by the user, so that the user of the power tool can control the direction of rotation of the cutting disc or the You can set or select the separating sheet on the power tool.
  • This advantageously makes it possible to provide a cut-off or angle grinder that is particularly easy to configure and is particularly user-friendly due to its adjustable tool rotation direction. It has been shown that particularly good suction of the material to be cut can be achieved with a power tool whose tool rotates clockwise in conjunction with a corresponding dust hood for the suction.
  • the power tool or the dust hood can be connected, for example, to a vacuum cleaner or a dust extractor. Furthermore, it has been shown that a power tool whose tool rotates counterclockwise leads to surprisingly little fatigue for the user. In other words, the invention can significantly reduce the physical strain on the user of the power tool when the tool of the cut-off or angle grinder is operated counterclockwise. A further advantage of the invention is that the direction of rotation of the tool of the power tool can be selected in particular depending on the accessibility of the substrate or the material to be separated.
  • a brushless motor can preferably be operated with mains operation or with one or more batteries and/or accumulators (“rechargeable batteries”).
  • Fig. 1 shows a schematic representation of a preferred embodiment of the proposed power tool (1) with a motor (9) and a rotating tool (3).
  • the power tool (1) is a cut-off grinder, a diamond cut-off grinder or an angle grinder.
  • a direction of rotation of the tool (3) can be set on the power tool (1).
  • the motor (9) is preferably a brushless motor.
  • the power tool device (1), which is in Fig. 1 is shown is a cut-off grinder, the tool (3) of which is designed as a cutting disc.
  • the power tool device (1) can comprise a dust hood (5), which preferably surrounds the rotating tool (3) and which is preferably designed to suck out the dust or the material to be cut, for example in conjunction with a dust extraction device (not shown). This advantageously prevents the dust from being inhaled by the user and entering their respiratory tract, where it can lead to health problems.
  • the power tool device (1) can include a position sensor (2) or a sensor (4) for detecting a type of dust hood (5).
  • the power tool (1) can include an on and off switch and a selector switch (6) for adjusting the direction of rotation of the tool (3) of the power tool (1).
  • the power tool (1) can include various handles (7) with which the user can hold the power tool (1) or guide it when working with the power tool (1).
  • the dust hood (5) can comprise coding means (8), which can be designed, for example, as mechanical, electrical and/or electronic coding means.
  • the power tool device (1) can comprise a display device (not shown) on which operating parameters of the power tool device (1) or information about the direction of rotation of the tool (3) of the power tool device (1) can be displayed to the user.
  • Components of the machine tool (1) shown can be arranged as shown in the figure. However, in the sense of the invention, it can also be preferred that they are arranged at other positions and at different distances from one another.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP22177433.4A 2022-06-07 2022-06-07 Appareil outil électrique doté d'un outil rotatif Pending EP4289553A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22177433.4A EP4289553A1 (fr) 2022-06-07 2022-06-07 Appareil outil électrique doté d'un outil rotatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22177433.4A EP4289553A1 (fr) 2022-06-07 2022-06-07 Appareil outil électrique doté d'un outil rotatif

Publications (1)

Publication Number Publication Date
EP4289553A1 true EP4289553A1 (fr) 2023-12-13

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EP22177433.4A Pending EP4289553A1 (fr) 2022-06-07 2022-06-07 Appareil outil électrique doté d'un outil rotatif

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2949432A1 (fr) * 2006-09-12 2015-12-02 Black & Decker, Inc. Dispositif anti-recul pour outil électrique doté d'un capteur de la vitesse de rotation
EP3391993A1 (fr) * 2017-04-20 2018-10-24 HILTI Aktiengesellschaft Meuleuse
EP3834993A1 (fr) * 2019-12-11 2021-06-16 Hilti Aktiengesellschaft Appareil outil électrique doté d'un moteur et d'un outil rotatif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2949432A1 (fr) * 2006-09-12 2015-12-02 Black & Decker, Inc. Dispositif anti-recul pour outil électrique doté d'un capteur de la vitesse de rotation
EP3391993A1 (fr) * 2017-04-20 2018-10-24 HILTI Aktiengesellschaft Meuleuse
EP3834993A1 (fr) * 2019-12-11 2021-06-16 Hilti Aktiengesellschaft Appareil outil électrique doté d'un moteur et d'un outil rotatif

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