Method for activating and deactivating a spindle lock in a power tool and power tool

Abstract

This invention relates to a method for enabling and disabling a spindle lock in a power tool, wherein the spindle lock can be enabled, for example, by intuitive movements of the user. Specifically, activation of the spindle lock can be achieved by a user's rotational movement on a tool accessory, which is recognized by the power tool's device electronics. Exceeding limits on the rotational angle or speed can be used by the device electronics as an activation signal for the spindle lock. The spindle lock can be deactivated when the device electronics determine that the tool accessory is rotating in the opposite direction. In another aspect, the invention relates to a power tool to which the method for enabling and disabling a spindle lock can be performed.

Description

Technical Field

[0001] This invention relates to a method for enabling and disabling a spindle lock in a power tool, wherein the spindle lock can be enabled, for example, by intuitive movements of the user. Specifically, the spindle lock can be enabled by rotational movements of the user on the tool fitting, which are recognized by the device electronics of the power tool. Exceeding limits on the rotational angle or speed can be used by the device electronics as an activation signal for the spindle lock. If the device electronics detect rotational movements of the tool fitting in the opposite direction, the spindle lock can be deactivated. In another aspect, the invention relates to a power tool to which the method for enabling and disabling a spindle lock can be performed. Background Technology

[0002] Prior art discloses power tools that enable work—for example, on construction sites or in the DIY field. Power tools can be cutting or severing devices, angle grinders or cutting grinders, core drilling devices, hammer drills or chisels, but are not limited to these. Power tools typically include tools that can be disc-shaped rotary tools (such as cutting discs or grinding discs) or hammering or chiseling tools.

[0003] Power tools known in the prior art are typically driven by an electric motor within the tool. The motor rotates, and this rotation is converted into the rotation of the tool or into hammering or chiseling motion. In the case of a core drilling device, the drill bit is used as a tool to cut a cylindrical core from a solid substrate (such as concrete, masonry, or stone). The drill bit is essentially hollow inside to receive the core. Users of core drilling devices know from experience that removing a drill bit that is blocked or stuck in the substrate from the borehole can be challenging.

[0004] Power tools (such as core drilling rigs) typically have a spindle lock, which preferably allows for quick tool changes. The spindle can be locked so that the tool can be released particularly easily. Mechanical and electronic methods for locking the spindle are known in the art. In the case of a mechanical method, a mechanical switch or slide switch is typically provided on the power tool, which can be used to lock the spindle and unlock the tool. In the case of an electronic spindle lock, the spindle is typically locked by actuating, preferably electronically switching, contacts. In this case, actuation of the switch in the device's electronics can be converted into corresponding energization of the power tool's motor via a microswitch and / or microcontroller.

[0005] However, it has been shown that implementing a dedicated switch for enabling and disabling the spindle lock in power tools is complex. Furthermore, due to space constraints, such a switch is undesirable, and there is no guarantee that it would be ergonomically sound for the user to actuate it. In addition, the additional switch and operating elements require extra space, which contradicts the need for a compact and convenient power tool. Summary of the Invention

[0006] The objective of this invention is to overcome the shortcomings of the prior art and to provide a method for enabling and disabling spindle locks in power tools. It is desirable that the corresponding power tool can do this without an additional switch for enabling or disabling the spindle lock. Furthermore, those skilled in the art will appreciate that enabling the spindle lock can be initiated as intuitively as possible, without requiring the user to actuate complex button combinations or perform manual actions. Additionally, the power tool to be provided should be as compact and convenient as possible. Another objective of this invention is to demonstrate how to more easily, than before, release a drill bit that is blocked or stuck in the substrate from the borehole.

[0007] In a first aspect, the present invention provides a method for activating a spindle lock in a power tool. The power tool includes a tool accessory for receiving the tool, as well as a motor and device electronics. The method for activating the spindle lock includes the following steps:

[0008] a) To cause the tool attachment of a power tool to perform a first rotational motion along a first rotational direction, wherein the first rotational motion can be defined by a rotation angle and / or a rotational speed, and wherein the limit values ​​of the rotation angle and / or the rotational speed are stored in the power tool.

[0009] b) If at least one of the limit values ​​of rotation angle and / or rotation speed is exceeded, the spindle lock is activated by the device electronics of the power tool.

[0010] In the proposed method, it is preferable that the user of the power tool touches and rotates its tool accessory. In other words, the user can rotate the tool accessory, and this rotational movement can be detected by the device's electronics. The tool accessory preferably rotates in a first rotational direction, which can be, for example, a spatial direction "to the right" or "to the left." The corresponding spatial and rotational directions are indicated by circular arrows in the figures.

[0011] The proposed method for activating the spindle lock provides a way in which the corresponding power tool does not require an additional switch to activate the spindle lock. Furthermore, the method is particularly intuitive to implement because the user makes intuitive movements on the power tool by rotating the tool accessory. Preferably, within the scope of this invention, this intuitive rotational movement made by the user on the tool accessory of the power tool can be recognized by the power tool or its electronic devices.

[0012] Within the scope of this invention, it is preferred that the power tool or its electronic components include at least one rotation sensor, which may, for example, be arranged adjacent to the motor of the power tool. The rotation sensor is preferably configured to detect rotational motion. Within the scope of this invention, it is particularly preferred that the rotation sensor is capable of detecting the rotational motion of the rotor of the motor of the power tool. The rotation sensor may include, for example, a Hall sensor or an AMR sensor (whose measurement principle is based on the anisotropic magnetoresistive effect), but is not limited thereto. Within the scope of this invention, it is preferred that the sensor system for detecting rotational motion is configured to generate digital and / or analog signals describing the rotational angle of the rotor of the motor of the power tool.

[0013] The rotational motion performed by a user on a tool accessory of a power tool can be specifically defined by rotation angle and / or rotation speed. The rotation angle preferably describes the range of angles by which the tool accessory deflects from its initial or idle position. The rotation angle can preferably be positive or negative, where, for example, a positive rotation angle represents rotational motion of the tool accessory along a first spatial direction, and a negative rotation angle represents rotational motion of the tool accessory along a second spatial direction. In the context of this invention, for example, the magnitude of the rotation angle is preferably in the range of 1 degree to 60 degrees, wherein all intermediate values ​​(e.g., 3.5 degrees, 10 degrees, 17 degrees, 28.3 degrees, etc.) are also preferably usable. Preferably, within the meaning of this invention, the rotation angle indicates whether the rotor of the power tool's motor deflects positively or negatively about its idle position.

[0014] The rotational speed preferably indicates how quickly the rotational angle changes over time. Within the meaning of this invention, it is preferred that the rotational movement of the tool accessories caused or resulting from the user of the power tool be referred to as the user-initiated rotational movement or the first rotational movement.

[0015] Within the scope of this invention, it is preferred that limit values ​​are defined for the rotation angle and / or rotation speed, wherein the spindle lock is preferably automatically activated when these values ​​are exceeded. Preferably, the proposed power tool implements a spindle locking function, preferably designed electronically, which can be activated when the limit values ​​for the rotation angle and / or rotation speed are exceeded. Preferably, this activation occurs automatically once the power tool's device electronics detect that at least one of the limit values ​​for the rotation angle and / or rotation speed has been exceeded.

[0016] Within the meaning of this invention, it is preferred that the extreme values ​​of the rotation angle are in the range of 1 degree to 120 degrees, more preferably in the range of 1 degree to 90 degrees, and most preferably in the range of 1 degree to 60 degrees. In other words, this means that the extreme values ​​can be in the range of -120 degrees to +120 degrees, more preferably in the range of -90 degrees to +90 degrees, and most preferably in the range of -60 degrees to +60 degrees, wherein the deflection is preferably indicated around the idle position of the rotor of the motor of the power tool in each case.

[0017] The limit of the rotational speed can be, for example, in the range of 0.05 degrees / second to 60 degrees / second, preferably in the range of 0.2 degrees / second to 45 degrees / second, and most preferably in the range of 0.5 degrees / second to 30 degrees / second.

[0018] Within the scope of this invention, it is preferred that the spindle lock represents an electronic function that can already be implemented in power tools. Unlike conventional power tools known in the prior art, in the context of this invention, the spindle lock does not need to be activated by a button or switch specifically designed for this purpose. Rather, in the context of this invention, the ability of the power tool or its electronic devices to detect and evaluate the rotational movement of the tool fittings in terms of rotational angle and / or rotational speed is used, such that exceeding corresponding limit values ​​is identified and used as a trigger or activation signal for the spindle lock.

[0019] Preferably, within the scope of this invention, the spindle lock in the context of this invention requires only one action from the user of the power tool to activate it, i.e., to perform a rotational movement on the tool accessory of the power tool. With this invention, activating the spindle lock is thus made simpler and more intuitive compared to conventional power tools known in the prior art. Advantageously, the operation of the proposed power tool can be significantly simplified in this way compared to conventional power tools. Furthermore, the design of the power tool eliminates the need for an additional switch for activating the preferred electronic spindle lock function, as such a switch is no longer required due to the advantageous interaction between the device electronics and the power tool (which is also the subject of this invention). By saving on an additional switch, this invention enables the provision of a particularly compact, convenient, and more intuitively operable power tool.

[0020] Preferably, within the scope of this invention, the rotational motion is detected by the device electronics as rotation of the motor without an active current supply. The device electronics of the power tool are preferably configured to recognize the rotational motion of the tool accessories as rotation of the motor without an active current supply, and to sense limits exceeding the rotational angle and / or speed of this rotational motion as a start signal to activate the spindle lock.

[0021] In a second aspect, the present invention relates to a method for disabling a spindle lock in a power tool, wherein the power tool includes a tool accessory for receiving the tool, as well as a motor and device electronics. The method for disabling the spindle lock includes the following steps:

[0022] a) When the spindle lock is in the active state, torque is applied to the motor of the power tool in the second rotational direction.

[0023] b) Due to the torque applied to the motor along the second spatial direction, the tool accessory rotates along the second spatial direction.

[0024] c) Detect rotational motion along the second spatial direction using electronic devices.

[0025] d) When rotational movement of the tool accessory along the second spatial direction is detected, the spindle lock is deactivated by the power tool's electronic device.

[0026] The terms, definitions, and technical advantages introduced for methods of enabling spindle lock are preferably similarly applied to methods of disabling spindle lock.

[0027] Within the scope of this invention, it is preferred that, for the purpose of locking the spindle, torque is applied to the motor of the power tool, wherein the rotational or acting direction of this torque is preferably along a direction opposite to a first rotational direction of the rotational movement of the tool fittings performed by the user of the power tool. Within the scope of this invention, it is preferred that the spindle lock is an electronic function of the power tool, wherein the motor of the power tool is powered by electricity or device electronics. An advantage of this invention is that no additional device is required on the power tool to implement the proposed method. Within the scope of this invention, it is preferred that the speed of the power tool's motor is adjusted to a value within the range of 0 revolutions per unit time (e.g., revolutions per minute, RPM), thereby preventing the motor from rotating.

[0028] Within the meaning of this invention, the direction of rotation or application of torque is referred to as the second rotational direction. It is preferably along the opposite direction to the first rotational movement of the tool accessory. If the user of the power tool rotates the tool accessory, for example, in a "right" spatial direction to activate the spindle lock, the torque applied to the motor of the power tool preferably acts in a "left" spatial direction.

[0029] The rotational movement of the tool accessory is preferably caused by applying torque to a motor. Within the meaning of this invention, this rotational movement of the tool accessory caused by the motor is preferably referred to as a second rotational movement of the tool accessory. Preferably, within the meaning of this invention, the user releasing the tool accessory results in the application of torque, causing the tool accessory to rotate in a second spatial direction. In other words, the tool accessory can perform a rotational movement in the opposite direction to the original rotational movement, particularly when the user of the power tool releases the tool accessory, i.e., no longer firmly grips it. Very particularly preferred within the meaning of this invention is that applying torque to the motor causes the rotational movement of the tool accessory, wherein this motor-initiated rotational movement is preferably in the opposite direction to the original rotational movement initiated by the user. In other words, applying torque to the motor causes the rotational movement of the tool accessory, wherein this second rotational movement of the tool accessory is in the opposite direction to the first rotational movement of the tool accessory. Within the meaning of this invention, the second rotational movement of the tool accessory can also preferably be referred to as a reverse rotational movement of the original first rotational movement of the tool accessory. Preferably, the torque is applied to the motor in the second rotational direction, particularly when the spindle lock is active.

[0030] The rotational movement of the tool accessory along the second spatial direction can be detected by the device electronics of the power tool. Preferably, the same sensor used to detect the first rotational movement is used to detect this second rotational movement of the tool accessory. Alternatively, two different sensors or sensor systems can also be used. Preferably, the rotational directions of the first and second rotational movements, as well as the direction of the current energizing the motor of the power tool, are different.

[0031] Preferably, the spindle lock of the power tool is deactivated once the device electronics detect rotational movement of the tool accessory along the second spatial direction or when the tool accessory is again in an idle position region. The power tool may include a control device for detecting rotational movements or for evaluating them and converting them into an enable (deactivate) signal for the spindle lock, and this control device may preferably include a processor and / or memory. Preferably, within the scope of this invention, the power tool includes a control device configured to detect rotational movement of the tool accessory in different spatial directions and to enable or deactivate the spindle lock according to the spatial direction.

[0032] Within the scope of this invention, it is particularly preferred that the power tool does not require an additional switch to enable (disable) the spindle lock. As described, a dedicated switch for enabling (disabling) the spindle lock is not needed on the power tool because, according to the invention, enabling (disabling) the spindle lock is achieved by detecting the rotational movement of the tool fittings.

[0033] The advantages of this invention are particularly the ability to intuitively enable or disable the spindle lock. Furthermore, it enables simple, intuitive, and clear operation of the power tool, especially with a relatively small number of switches. In this way, the production cost of the power tool can be kept low, and space-saving, compact power tools can be provided. This can be particularly advantageous, especially when providing handheld power tools instead of column-mounted ones. Within the scope of this invention, it is particularly preferred that the power tool is a core drilling device. Of course, the proposed method can also be used for other types of power tools, such as cutting mills or angle grinders, drills or hammer drills, chisels, or other devices.

[0034] In another aspect, the present invention relates to a power tool for implementing a method for activating a spindle lock, wherein the power tool has a tool accessory for receiving the tool, as well as a motor and device electronics. The power tool according to this aspect of the invention is characterized in that the tool accessory is designed to be rotatable, and the device electronics are configured to detect the rotational angle and / or rotational speed of the rotational movement of the tool accessory. If at least one limit value of the rotational angle and / or rotational speed is exceeded, the spindle lock can be activated by the device electronics. When the device electronics detect that the rotational movement of the tool accessory exceeds the limit rotational angle, the device electronics can activate a preferred electronic spindle locking function of the power tool. Alternatively or additionally, if a particularly rapid rotational movement is detected, the device electronics can activate the spindle lock. A particularly rapid rotational movement can be specifically identified by the fact that the rotational speed of the rotational movement exceeds the limit rotational speed. The limit values ​​of the rotational angle and / or rotational speed can be stored in the power tool. For this purpose, the power tool can preferably include a control device, which includes, for example, a processor and / or a memory. The control device of the power tool can be particularly configured to compare the current rotational angle with the limit rotational angle. Specifically, the control device can be configured to perform a comparison between the current rotational speed and the limit rotational speed. If the comparison indicates that the current value of the rotational angle and / or rotational speed exceeds the corresponding limit value, a spindle lock is activated. This activation is preferably performed by the device electronics or the control device. The control device can specifically represent a component of the device electronics.

[0035] In another aspect, the present invention relates to a power tool for implementing a method for disabling a spindle lock, wherein the power tool has a tool accessory for receiving the tool, as well as a motor and device electronics. A power tool according to this aspect of the invention is characterized in that torque can be applied to the motor of the power tool, wherein the device electronics are configured to detect rotational movement of the tool accessory and disabling the spindle lock upon detection of rotational movement along a second spatial direction. In this preferred embodiment of the invention, the tool accessory is preferably also designed to be rotatable. Preferably, within the meaning of the invention, torque is applied to the motor by the power tool or its spindle locking function. The direction of rotation or action is preferably along the opposite direction to the original rotational movement of the tool accessory caused by the user of the power tool. Applying torque to the motor specifically causes rotational movement of the tool accessory along the rotational or action direction of the torque. Within the meaning of the invention, this preferably means that the motor of the power tool causes rotational movement of the tool accessory in the opposite direction to the initial or first rotational movement of the tool accessory caused by the user. This rotational movement can also be detected by the device electronics of the power tool and used as a disabling signal for the spindle lock. In other words, the spindle lock is deactivated when the power tool detects a second rotational movement of the tool accessory in the opposite direction to the first rotational movement of the tool accessory.

[0036] Within the meaning of this invention, it is preferred that torque is applied to the motor when the spindle lock is in the active state. Preferably, applying torque to the motor causes a second rotational movement of the tool accessory. In other words, applying torque to the motor causes rotational movement of the tool accessory, wherein the torque is in the opposite direction to the first rotational movement of the tool accessory.

[0037] Within the meaning of this invention, it is particularly preferred that the power tool does not require an additional switch to activate and / or deactivate the spindle lock.

[0038] Preferably, when the power tool is a core drilling device, the present invention can also facilitate the release of drill bits stuck in the borehole. To remove a stuck drill bit from the bottom of the borehole, rotational movement on the power tool is typically required. However, for unlocked devices, there is no rigid connection between the tool and the handle of the power tool. Therefore, the device handle cannot be used to release the drill bit. With the intuitive activation of the proposed spindle lock, the user's rotation on the power tool is recognized by the power tool, and torque can be transmitted to the drill bit via the reverse torque of the spindle lock function.

[0039] It has been shown that the use of this device can be significantly expanded or improved by the present invention. If the invention is used, for example, in an angle grinder, some machines may require actuation (i.e., conventional pressing) of a second tool or mechanical lock to open and / or close the grinding disc mount. In the case of a power tool according to the invention, this actuation of the additional components of the power tool can be advantageously eliminated. Similar advantages can be achieved, for example, if the invention is used in a handheld circular saw. Attached Figure Description

[0040] Further advantages will become apparent from the following description of the drawings. The drawings, description, and claims contain a number of features in combination. Those skilled in the art will also readily consider these features individually and combine them to form other useful combinations.

[0041] In the accompanying drawings, identical and similar parts are indicated by the same reference numerals.

[0042] In the attached diagram:

[0043] Figure 1 A view illustrating an exemplary preferred embodiment of the present invention is shown. Detailed Implementation

[0044] Figure 1 A preferred embodiment of the proposed power tool 1 is shown. The power tool 1 includes a motor 4 and device electronics 5, which can be housed in the housing of the power tool 1. Figure 1 The positions of the motor 4 and the electronic components 5 of the power tool 1 shown are to be understood as examples; of course, other positions within the power tool 1 are also conceivable. The power tool 1 also has a tool accessory 2 for fastening the tool 3. Figure 1 The power tool 1 shown is a core drilling device, and the tool of this core drilling device is formed by a drill bit 3. The drill bit 3 is schematically indicated in... Figure 1 The upper left of the upper part of the area.

[0045] in addition, Figure 1 The image indicates the hand of the user 6 of the power tool 1. The user 6 can grasp the tool accessory 2 of the power tool 1 and rotate it. Within the meaning of this invention, the user therefore preferably causes a first rotational movement of the tool accessory 2 of the power tool 1. This first rotational movement of the tool accessory 2 can occur in a spatial direction of "right" or "left," which is... Figure 1The first rotational movement of the tool accessory 2 is indicated by a curved double arrow. In color representation, this curved double arrow is orange. Within the meaning of this invention, the direction of rotation of the first rotational movement of the tool accessory 2 is preferably also referred to as the first rotational direction. The power tool 1 is preferably configured to detect the first rotational movement of the tool accessory 2. The rotational movement of the tool accessory 2 can preferably be described by rotation angle and / or rotational speed. Limit values ​​of rotation angle and / or rotational speed are stored in the power tool 1, wherein the power tool 1 is preferably configured to detect the current rotation angle and rotational speed and compare them with the stored limit values. If the result of such comparison exceeds one of the stored limit values, the spindle lock is preferably automatically activated.

[0046] When the spindle lock is active, torque can be applied to the motor 4 of the power tool 1. This torque application can be initiated by the device electronics 5 of the power tool 1. Preferably, the torque is in the direction opposite to the first rotational movement of the tool accessory 2. This torque causes a second rotational movement of the tool accessory 2, which points in the opposite direction to the first rotational movement. This second rotational movement of the tool accessory 2 can be recognized by the power tool 1 and converted into disengagement of the spindle lock. In other words, detecting the second rotational movement of the tool accessory 2 can serve as a signal to disengage the spindle lock of the power tool 1. The corresponding detection and control process preferably occurs in the device electronics 5 of the power tool 1. However, the power tool 1 may also include a control device (not shown), which can be part of the device electronics 5. In this embodiment of the invention, the detection and control process can preferably also occur in the control device. The control device may include a processor and / or a memory, in which case, for example, limit values ​​for rotation angle and rotational speed can be stored in the memory of the control device. The positions of the motor 4 and the device electronics 5 are... Figure 1 The examples shown are merely illustrative. The components of power tool 1 can, of course, be arranged in various other locations within power tool 1.

[0047] List of reference numerals

[0048] 1 Power Tools

[0049] 2. Power tool accessories

[0050] 3. Power tools

[0051] 4. Motors of power tools

[0052] 5. Electronic devices of power tools

[0053] 6 users

Claims

1. A method for activating a spindle lock in a power tool (1), wherein, The power tool (1) includes a tool accessory (2) for receiving the tool (3), a motor (4), and device electronics (5). This method includes the following steps: a) The user of the power tool (1) touches and rotates the tool accessory (2) of the power tool (1), causing the tool accessory (2) of the power tool (1) to perform a first rotational movement in a first rotational direction, wherein the first rotational movement can be defined by a rotation angle and / or a rotational speed, and wherein the limit values ​​of the rotation angle and / or the rotational speed are stored in the power tool (1). b) If at least one of these limit values ​​of the rotation angle and / or the rotation speed is exceeded, the spindle lock is activated by the device electronics (5) of the power tool (1).

2. A method for disabling the spindle lock in a power tool (1), wherein, The power tool (1) includes a tool accessory (2) for receiving the tool (3), a motor (4), and device electronics (5). This method includes the following steps: a) When the user of the power tool (1) touches and rotates the tool accessory (2) of the power tool (1), and the spindle lock is in the active state, torque is applied to the motor (4) of the power tool (1) in the second rotation direction. b) Due to the torque applied to the motor (4) along the second rotational direction, the tool accessory (2) rotates along the second rotational direction. c) The rotational motion along the second rotational direction is detected by the electronic device (5) of the device. d) When the rotational movement of the tool accessory (2) along the second rotational direction is detected, the spindle lock is deactivated by the device electronics (5) of the power tool (1).

3. The method as described in claim 2, Its features are, The first rotation direction is opposite to the second rotation direction.

4. The method as described in claim 1, Its features are, The rotational motion of the tool accessory (2) along the first rotational direction is detected by the device electronics (5) as the rotation of the motor (4) of the power tool (1) without active current supply.

5. The method as described in claim 1 or 4, Its features are, The maximum value of this rotation angle is in the range of 1 degree to 120 degrees.

6. The method as described in claim 1 or 4, Its features are, The maximum value of this rotation angle is in the range of 1 degree to 90 degrees.

7. The method as described in claim 1 or 4, Its features are, The maximum value of this rotation angle is in the range of 1 degree to 60 degrees.

8. The method as described in claim 1 or 4, Its features are, The limit of this rotational speed is in the range of 0.05 degrees / second to 60 degrees / second.

9. The method as described in claim 1 or 4, Its features are, The limit of this rotational speed is in the range of 0.2 degrees / second to 45 degrees / second.

10. The method as described in claim 1 or 4, Its features are, The limit of this rotational speed is in the range of 0.5 degrees / second to 30 degrees / second.

11. The method as described in claim 2, Its features are, The user (6) of the power tool (1) releases the tool accessory (2), causing torque to be applied to the motor (4) and causing the tool accessory (2) to rotate in the second rotation direction.

12. A power tool for carrying out the method as claimed in any one of claims 1 to 10, wherein, The power tool (1) has a tool accessory (2) for receiving the tool (3), as well as a motor (4) and device electronics (5). Its features are, The tool accessory (2) is designed to be rotatable, and the device electronics (5) is configured to detect the rotation angle and / or rotation speed of the rotational movement of the tool accessory (2), wherein if at least one limit value of the rotation angle and / or the rotation speed is exceeded, the spindle lock can be activated by the device electronics (5).

13. A power tool (1) for carrying out the method as described in any one of claims 2, 3, or 11, wherein, The power tool (1) has a tool accessory (2) for receiving the tool (3), as well as a motor (4) and device electronics (5). Its features are, Torque can be applied to the motor (4) of the power tool (1), wherein the device electronics (5) are configured to detect the rotational movement of the tool accessory (2) and deactivate the spindle lock when rotational movement along a second rotational direction is detected.

14. The power tool (1) as described in claim 13. Its features are, When the spindle lock is active, the torque is applied to the motor (4).

15. The power tool (1) as described in claim 13 or 14. Its features are, The torque is applied to the motor (4) to cause the tool accessory (2) to rotate.

16. The power tool (1) as described in any one of claims 12 to 14. Its features are, The power tool (1) is a core drilling device.

17. The power tool (1) as described in any one of claims 12 to 14. Its features are, The power tool (1) does not require an additional switch to enable and / or disable the spindle lock.

Images