Methods for open-loop and closed-loop control of power tools

Abstract

The invention relates to a handle device (5) located on a power tool (1), in particular a chipping hammer, and to a method for open-loop and closed-loop control of a power tool (1), in particular a chipping hammer, the power tool comprising a drive (3), a control device (13), and a transmission device (6), wherein the handle device (5) includes a lever element with a signal transmitter, the lever element being pivotable relative to a sensor device (13).

Description

[0001] The invention relates to a method for open-loop and closed-loop control of a power tool, in particular a chiseling hammer, which has a drive, a control device, a sensor device, a transmission device and a handle device, wherein the handle device contains a lever element with a signal transmitter, which can be pivoted relative to the sensor device.

[0002] Furthermore, the invention relates to a handle device on a power tool, in particular a hammer, having a drive, a control device, and a transmission, wherein the handle device contains a lever element which is pivotable relative to a housing of the power tool.

[0003] Chipping hammers according to the prior art are used for working (i.e. tearing, crushing or chiseling) mineral materials, such as concrete, bricks, etc. Chipping hammers can also be called demolition hammers, machine chisels or crushers. Chipping hammers have a drive which transmits the impact to a chisel tool (also called a chisel) with the help of a transmission mechanism. The drive can be an electric motor or a combustion engine.

[0004] Typically, a chipping hammer has two handles, which are located on opposite sides of the housing of the chipping hammer. At least one of the two handles includes an activation switch, with which the chipping hammer can be activated or switched on. In this case, the handles typically extend at an obtuse angle to the longitudinal axis of the housing of the chipping hammer. To use the chipping hammer, the activation switch is pressed and the chipping hammer is activated, so that the impact is transmitted to the chisel via the drive.

[0005] A problem with prior art chiseling hammers is that after the chiseling hammer has been activated (i.e. switched on), the drive is usually operated at maximum speed and the chiseling hammer is therefore operated at full power. If the user does not yet have adequate control of the chiseling hammer, i.e. the user has not yet placed both of his hands on the respective handles and has not yet firmly grasped the chiseling hammer, the chiseling hammer is poorly guided and cannot be used adequately and safely.

[0006] The object of the present invention is therefore to solve the above-mentioned problems and to provide a handle device on a power tool, in particular a chipping hammer, which handle device makes it possible to work easily and safely with the power tool, in particular with a chipping hammer.

[0007] This object is achieved by a method for open-loop and closed-loop control of a power tool, in particular a chiseling hammer, which has a drive, a control device, a sensor device, a transmission device and a handle device, wherein the handle device contains a lever element with a signal transmitter, which can be pivoted relative to the sensor device.

[0008] According to the present invention, the following method steps are involved:

[0009] - sensing, by the sensor device, a first position and a second position of the signal transmitter;

[0010] - determining, by the control device, a first speed of the signal transmitter from the first position to the second position; and

[0011] - setting a first rotational speed for the drive according to the first speed of the signal transmitter.

[0012] According to an advantageous embodiment of the present invention, the following method steps may be involved:

[0013] - sensing, by the sensor device, a first position and a second position of the signal transmitter;

[0014] - determining, by the control device, a second speed of the signal transmitter from the first position to the second position; and

[0015] - setting a second rotational speed for the drive according to the second speed of the signal transmitter.

[0016] In this case, the second position is arranged to be lower than the first position in a certain direction. Therefore, the second position is arranged closer to the tool than the first position. In this case, the second speed has a value higher than the first speed, and the second rotation speed has a value higher than the first rotation speed.

[0017] According to another advantageous embodiment of the present invention, the following method steps may be involved:

[0018] - sensing the first position and the third position of the signal transmitter by the sensor device;

[0019] - determining, by the control device, a third speed of the signal transmitter from the first position to the third position; and

[0020] - setting a third rotational speed for the drive according to the third speed of the signal transmitter.

[0021] In this case, the third position is arranged to be lower than the first position and the second position in a certain direction. Therefore, the third position is arranged closer to the tool than the first position and the second position. In this case, the third speed has a value higher than the first speed and the second speed, and the third rotation speed has a value higher than the first rotation speed and the second rotation speed.

[0022] According to an advantageous embodiment of the present invention, the following method steps may be involved:

[0023] - sensing, by the sensor device, a first position and a second position of the signal transmitter;

[0024] - determining, by the control device, the speed of the signal transmitter from the first position to the second position; and

[0025] - The control device sets a deactivation mode for the drive.

[0026] In this case, the first position is arranged in a direction lower than the second position. The first position is therefore arranged closer to the tool than the second position.

[0027] The object is also achieved by a handle device on a power tool, in particular a chipping hammer, which has a drive, a control device, and a transmission, wherein the handle device contains a lever element that can be pivoted relative to a housing of the power tool.

[0028] According to the present invention, the lever element can be reversibly moved relative to the housing of the power tool by applying force in one direction, and includes a sensor device for sensing at least one first position or second position of the lever element relative to the housing of the power tool, wherein the control device is configured to determine a first speed of the signal transmitter from the first position to the second position and set a first rotational speed for the drive according to the first speed of the signal transmitter.

[0029] In this case, the value of the second rotational speed is higher than the value of the first rotational speed. In this case, the drive can be in the form of an electric motor. When the power tool is in the form of a chisel hammer, the transmission can be configured as an impact mechanism. By means of high rotational speed values, a high impact energy can be generated on the tool in the form of a chisel by the combination of the drive in the form of an electric motor and the transmission in the form of an impact mechanism.

[0030] According to a preferred embodiment of the invention, the lever element may include a signal transmitter having at least one magnet, and the sensor device may include at least one first Hall sensor and a second Hall sensor for sensing the at least one magnet, wherein the signal transmitter is reversibly movable relative to the sensor device.

[0031] According to an advantageous embodiment of the invention, the sensor device may comprise at least one 3D sensor. As a result of using at least one 3D sensor, the sensor device is able to sense the magnetic field strength of the magnet and thus the position, position change and speed of the signal transmitter.

[0032] According to an advantageous embodiment of the invention, a separately actuated switch-on device can be included on the power tool. By means of the switch-on device, at least the drive of the power tool can be activated. In this case, the transmission device is not activated by means of the switch-on device.

[0033] Further advantages will become apparent from the following description of the drawings. A number of different exemplary embodiments of the present invention are shown in the drawings. The drawings, the description and the claims contain many combined features. It will also be convenient for those skilled in the art to consider these features individually and combine them to produce useful further combinations.

[0034] In the accompanying drawings, the same and similar parts are represented by the same reference numerals. In the accompanying drawings:

[0035] Figure 1 shows a schematic front view of a power tool according to the invention in the form of a chipping hammer having a handle device according to the invention;

[0036] Figure 2a shows a detailed view of a handle device in a first position according to a first exemplary embodiment;

[0037] Figure 2b shows a detailed view of the handle device in a second position according to the first exemplary embodiment;

[0038] Figure 2c shows a detailed view of the handle device in a third position according to the first exemplary embodiment;

[0039] Figure 3a shows a detailed view of a handle device in a first position according to a second exemplary embodiment;

[0040] Figure 3b shows a detailed view of a handle device in a second position according to a second exemplary embodiment;

[0041] Figure 3c shows a detailed view of the handle device in a third position according to the second exemplary embodiment;

[0042] Figure 4a shows a detailed view of a handle device in a first position according to a third exemplary embodiment;

[0043] Figure 4b a detailed view showing a handle device in a second position according to a third exemplary embodiment; and

[0044] Figure 4c A detailed view of a handle device according to a third exemplary embodiment is shown in a third position. DETAILED DESCRIPTION

[0045] Figure 1 A power tool 1 according to the invention is shown in the form of a chipping hammer. However, the power tool 1 may also be in the form of a hammer drill, a power drill, a saw, a sander or the like.

[0046] like Figure 1 As shown, the power tool 1 in the form of a chiseling hammer mainly comprises a housing 2 , a drive 3 , a control device 4 , a first handle device and a second handle device 5 , a transmission device 6 , an energy supply device 7 and a tool assembly 8 .

[0047] Located inside the housing are primarily the drive 3, the control device 4 and the transmission 6. The drive 3 is in this case in the form of an electric motor. The electric motor may be a brushless electric motor.

[0048] A tool mounting 8 is located at the lower end of the housing 2 of the power tool 1. By means of the tool mounting 8, a tool 9 can be mounted and held. In the figures, the tool 9 is in the form of a chisel.

[0049] Furthermore, an energy supply device 7 is arranged on the first side wall 2a of the housing 2 of the power tool 1. In the given example of the power tool 1, the energy supply device 7 is a mains connection and a mains cable. The free end of the mains cable can be connected to the mains connection (also called a power socket). With the help of the energy supply device 7, the power tool 1 and in particular the drive 3 in the form of an electric motor can be supplied with energy, for example electrical energy.

[0050] According to an alternative embodiment of the power tool 1 according to the invention, the energy supply device 7 can also be in the form of a single rechargeable battery or a plurality of rechargeable batteries. The single rechargeable battery or a plurality of rechargeable batteries are positioned on or in the housing 2 of the power tool 1 by means of one or more battery interfaces.

[0051] As already mentioned above, the drive 3 is in the form of an electric motor in the present embodiment of the power tool 1. Alternatively, the drive 3 can also be a combustion engine. In this case, the energy supply device 7 is in the form of a fuel tank.

[0052] According to another alternative embodiment of the power tool 1 according to the invention, the drive 3 can also be configured in the form of a pneumatic drive or compressor. In this case, the energy supply device 7 can be a compressed air connector or compressed air supplier on or in the power tool 1.

[0053] The drive 3 in the form of an electric motor is used to generate torque. The torque generated by the drive 3 can be transmitted to the tool assembly 8 and finally to the tool 9 in the form of a chisel by means of a transmission 6 in the form of (hammer) impacts. The transmission 6 can also be referred to as an impact mechanism. The higher the frequency of the impacts, the more impact energy is generated.

[0054] The control device 4 is connected to the first and second handle devices 5 and the drive 3. Signals and communication data can thus be sent and received between the handle devices 5, the drive 3 and the control device 4. The control device 4 is used for open-loop and closed-loop control of various functions of the power tool 1, in particular for setting parameters or operating parameters of the drive 3. By means of the control device 4, the rotational speed of the drive 3 in the form of an electric motor can thus be set as a parameter or operating parameter.

[0055] The first handle device 5 is movably positioned on the first side wall 2a of the housing 2, and the second handle device 5 is movably positioned on the second side wall 2b of the housing 2. Figure 1 As shown in FIG. 2 , each of the first handle device and the second handle device 5 comprises a lever element 10 and a handle member 11. Each lever element 10 of the first handle device and the second handle device 5 is mounted in a manner that can pivot along the rotation direction C or D through a corresponding first pivot point D1. The first handle device and the second handle device 5 are used for a user to hold and guide the power tool 1. The user is not shown in the figure.

[0056] Figure 2a to Figure 2c A handle device 5 according to the invention in the form of a first exemplary embodiment is shown. In this case, the handle device 5 according to the first exemplary embodiment essentially comprises a lever element 10 , a handle piece 11 , an activation element 12 , a sensor device 13 and a signal transmitter 14 .

[0057] The activation element 12 in the form of an actuation switch is used to activate the drive 3 of the power tool 1. By applying a force in the direction S, the activation element 12 can be reversibly moved from a first position to a second position. Figure 2a In FIG. 1 , the activation element 12 is shown in the first position, i.e. in the non-pressed state. In this case, the first position corresponds to the uppermost position. Once the activation element 12 moves from the first position to the second position, the drive 3 is activated. Figure 2b and Figure 2c , the enabling element 12 is shown in each case in the second position, i.e. in the pressed state. The enabling element 12 is connected to the control device 4 so that signals can be exchanged between the enabling element 12 and the control device 4. The connection between the enabling element 12 and the control device 4 is not shown in the figure. A specific position of the enabling element 12, i.e. the first position or the second position, is transmitted to the control device 4 by means of a corresponding signal. When the enabling element 12 is in the second position, the drive 3 of the power tool 1 is only enabled. The transmission device 6 in the form of an impact mechanism device is not enabled or started only by pressing the enabling element 12 in the direction of the arrow S.

[0058] The sensor device 13 is connected to the control device 4 so that signals, data and information can be exchanged between the sensor device 13 and the control device 4 .

[0059] The lever element 10 is substantially in the form of an elongated lever arm having a first end 10a and a second end 10b and having a top side 10c and a bottom side 10d. The lever element 10 is mounted at the first end 10a so as to be reversibly pivotable in a rotational direction C or D relative to the housing 2 of the power tool 1 via a first pivot point D1. When a force is applied to the top side 10c of the lever element 10 in the direction A, the lever element 10 pivots around the pivot point D1 in the rotational direction C. When a force is no longer applied to the top side 10c of the lever element 10, the lever element 10 pivots back to the starting position in the rotational direction D around the first pivot point D1 by means of a first spring element 15. In this case, the first spring element 15 can be configured in the form of a helical spring or a torsion bar spring.

[0060] The signal transmitter 14 is firmly connected to the lever element 10 and is configured in the form of a magnet. The magnet may be a permanent magnet. Figure 2a to Figure 2c As shown, a signal transmitter 14 in the form of a magnet is positioned on the lever element 10. As a result of the positioning on the lever element 10, the signal transmitter 14 can be moved relative to the housing 2 of the power tool 1.

[0061] The sensor device 13 is positioned on the first side wall 2a of the housing 2 of the power tool 1 and mainly includes a first Hall sensor 16a, a second Hall sensor 16b and a third Hall sensor 16c. Figure 2a to Figure 2c As shown, the three Hall sensors 16a, 16b, 16c are positioned one above the other on the housing 2 of the power tool 1 in direction A. The Hall sensors 16a, 16b, 16c are positioned on the housing 2 of the power tool 1 so that when the lever element 10 is pivoted in the rotation direction C or D, at least one of the three Hall sensors 16a, 16b, 16c can always detect the position of the signal transmitter 14 in the form of a magnet.

[0062] According to alternative embodiments, more or less than three Hall sensors may also be provided.

[0063] As mentioned above, in Figure 2a , the enabling element 12 has not yet been pressed in direction A and the handle device 5 has not yet been pivoted in direction C due to the application of a force. The first (i.e. uppermost) Hall sensor 16a of the sensor device 13 senses the proximity of the signal transmitter 14 in the form of a magnet. The sensor device 13 sends a corresponding signal to the control device 4 to inform the control device 4 that no force is applied to the handle device 5. In this state, neither the drive 3 nor the transmission 6 is enabled. Therefore, no impact energy is transmitted to the tool 9. For example, a tool change can be performed safely in this state.

[0064] exist Figure 2bIn the embodiment of the present invention, a first force is exerted in direction A on the activation element 12 and the handle device 5. As a result, the activation element 12 is moved from the first position to the second position. The drive 3 is then activated. At the same time, as a result of the application of the force in direction A, the handle device 5 and thus the lever element 10 are pivoted in the rotation direction C about the first pivot point D1. Figure 2b In the embodiment of the present invention, sufficient force is exerted on the handle device 5 and the lever element 10 to bring the handle device 5 into an intermediate position. In this case, the signal transmitter 14 in the form of a magnet is positioned so that the second (intermediate) Hall sensor 16b of the sensor device 13 can sense the magnet. The sensor device 13 thus senses that the handle device 5 is in an intermediate position. When the sensor device 13 senses the intermediate position of the handle device 5 by means of the second Hall sensor 16b, a corresponding signal is sent to the control device 4. The signal informs the control device 4 that the user is applying an intermediate force to the handle device 5. The control device 4 controls the drive 3 in the form of an electric motor so that a first rotational speed is set for the drive 3 in accordance with the intermediate force applied to the handle device 5. The first rotational speed specifies a first impact energy value from the transmission 6 to the tool 9.

[0065] exist Figure 2c In the embodiment, the second force is applied to the handle device 5 along the direction A. In this case, the second force is greater than the first force. Figure 2c As can be seen in FIG. 1 , the activation element 12 continues to be in the second (ie, pressed) position. The actuator 3 is further activated by pressing the activation element 12 in the direction S. The result of applying a second (ie, increased) force on the handle device 5 in the direction A is that, compared to Figure 2b , the lever element 10 is pivoted further in the direction of rotation C. In this case, the lever element 10 is pivoted to such an extent that the signal transmitter 14 located on the lever element 10 is at the level of the third (i.e. the bottommost) Hall sensor 16c. The sensor device 13 thus senses that the maximum pressure is being exerted on the handle device 5 and that the handle device 5 is in a lower (i.e. the bottommost) position. When the sensor device 13 senses the bottommost position of the handle device 5 by means of the third Hall sensor 16c, a corresponding signal is sent to the control device 4. The signal informs the control device 4 that the user is applying the maximum force to the handle device 5. The control device 4 controls the drive 3 in the form of an electric motor so that a second rotation speed is set for the drive 3 depending on the maximum force exerted on the handle device 5. In this case, the value of the second rotation speed is higher than the value of the first rotation speed. The second rotation speed specifies a second impact energy value from the transmission device 6 to the tool 9. The second impact energy value is greater than the first impact energy value.

[0066] Figure 3a to Figure 3cA handle device 5 according to the invention in the form of a second exemplary embodiment is shown. In this case, the handle device 5 according to the second exemplary embodiment essentially comprises a lever element 10 , a handle piece 11 , an activation element 12 , a sensor device 13 and a signal transmitter 14 .

[0067] from Figure 3a to Figure 3c It is clear that, in contrast to the handle device 5 according to the first exemplary embodiment, in the second exemplary embodiment, the activation element 12 and the signal transmitter 14 are positioned on the connecting element 17. The connecting element 17 is configured to be substantially elongated and has a first end 17a and a second end 17b. The activation element 12 is positioned at the first end 17a of the connecting element 17, and the signal transmitter 14 is positioned at the second end 17b of the connecting element.

[0068] Furthermore, the first end 17a of the connecting element 17 is provided with a pivot bearing so that the connecting element 17 can pivot about the second pivot point D2 in the rotational direction E or F. As a result of applying a force in the direction A on the activation element 12, the connecting element 17 pivots or rotates in the rotational direction E about the pivot point D2.

[0069] When the connecting element 17 is pivoted about the pivot point D2 in the rotational direction E, the signal transmitter 14 at the second end is moved in the direction A. The signal transmitter 14 in the form of a magnet is thus guided past the three Hall sensors 16a, 16b, 16c of the sensor device 13 .

[0070] As already mentioned above, the sensor device 13 senses the position of the signal transmitter 14 in the form of a magnet. By means of the position of the signal transmitter 14 relative to the sensor device 13, the angle of the handle device 5 and the force with which the handle device 5 is being pressed in the direction A can be determined. As also already mentioned above, the rotational speed of the drive 3 and thus the output of impact energy from the transmission 6 to the tool 9 are set as a function of the position of the signal transmitter 14 and the position of the lever element 10 relative to the sensor device 13 and relative to the housing 2 of the power tool 1, respectively.

[0071] When no force or pressure is applied to the activation element 12 in direction A, the activation element 12 moves back to the starting position by means of the second spring element in direction B. The connecting element 17 pivots back about the pivot point D2 in the rotational direction F by means of the second spring element. The second spring element is not shown in the figure.

[0072] Figures 4a to 4c A handle device 5 according to the invention in the form of a third exemplary embodiment is shown. In this case, the handle device 5 according to the third exemplary embodiment essentially comprises a lever element 10 , a handle piece 11 , an activation element 12 , a sensor device 13 and a signal transmitter 14 .

[0073] The configuration of the handle device 5 according to the third exemplary embodiment is similar to the handle device 5 according to the first exemplary embodiment. The handle device 5 according to the third exemplary embodiment is different from the handle device 5 according to the first exemplary embodiment in that the sensor device 13 does not include the first Hall sensor 16a, the second Hall sensor 16b and the third Hall sensor 16c, but only includes a 3D sensor. Alternatively, the sensor device may also include more than one 3D sensor.

[0074] 3D sensors can also be called TOF cameras (= Time of Flight Camera) and / or PMD sensors (= Photon Mixer Device).

[0075] The control device 4 is configured to set a specific rotational speed for the drive 3. To this end, firstly the sensor device 13 senses a first position and a second position of the lever element 10 with the signal transmitter 14 relative to the sensor device 13. In this case, the second position is lower than the first position in the direction A and the first position is therefore closer to the tool 9. The data of the first position and the second position are sent from the sensor device 13 to the control device 4. With the aid of the first position and the second position of the signal transmitter 14 and the sensing time period between these two positions, the control device 4 can determine a first speed of the lever element 10 with the signal transmitter 14. Depending on the determined speed, the control device 4 sets a first rotational speed for the drive 3. Since a specific rotational speed is set for the drive 3, the transmission device 6 in the form of an impact mechanism generates a specific impact energy on the tool.

[0076] Accordingly, the second speed generates a second rotational speed and thus generates a second impact energy. In this case, the second speed is higher than the first speed, the second rotational speed is higher than the first rotational speed, and the second impact energy is also higher than the first impact energy.

[0077] The higher the speed of the lever element 10 that is determined, the higher the speed that is set for the drive 3 and the higher the impact energy that is generated by the transmission 6 and transmitted to the tool.

[0078] If the sensor device 13 senses a first position and a third position of the lever element 10 with the signal transmitter 14 relative to the sensor device 13 and the distance between the first position and the third position is greater than the distance between the first position and the second position, the speed is again determined by means of the control device 4. The speed is again determined from the two positions and the time period between the two positions. If there is another, third, speed at which the lever element 10 with the signal transmitter 14 moves from the first position to the third position, a third rotational speed is set for the drive 3. In this case, the third speed is higher than the first speed and the second speed.

[0079] The third rotational speed is likewise higher than the first rotational speed and the second rotational speed. As a result of the increased (ie third) rotational speed of the drive 3 , increased impact energy is also generated by the transmission 6 and transmitted to the tool 9 .

[0080] Here, the speed determined between the first position and the third position of the signal transmitter 14 relative to the sensor device 13 can correspond to the speed determined between the first position and the second position of the signal transmitter 14 relative to the sensor device 13. In this case, a first rotational speed is set for the drive 3 (as described above), and thus a first impact energy is also transmitted from the transmission device 6 to the tool 9.

[0081] List of Reference Numerals

[0082] 1. Power Tools

[0083] 2 Shell

[0084] 2a First side of the housing

[0085] 2b The second side of the housing

[0086] 3. Drive

[0087] 4 Control device

[0088] 5 handle devices

[0089] 6 Transmission

[0090] 7Energy supply device

[0091] 8 Tool assembly parts

[0092] 9 Tools

[0093] 10 Lever element

[0094] 10a First end portion of the lever element

[0095] 10b Second end of the lever element

[0096] 10c Top side of lever element

[0097] 10d Underside of lever element

[0098] 11 handle parts

[0099] 12 Enable components

[0100] 13Sensor device

[0101] 14Signal transmitter

[0102] 15First spring element

[0103] 16a First Hall sensor

[0104] 16b Second Hall sensor

[0105] 16c Third Hall Sensor

[0106] 17 Connecting elements

[0107] 17a First end of the connecting element

[0108] 17b Second end of the connecting element

Claims

1. A method for open-loop and closed-loop control of a power tool (1), the power tool having a drive (3), a control device (4), a sensor device (13), a transmission device (6), a handle device (5) and a tool (9), in, The handle device (5) comprises a lever element (10) with a signal transmitter (14), which can be pivoted relative to the sensor device (13). It is characterized by the following method steps - sensing, by the sensor device (13), a first position and a second position of the signal transmitter (14), the second position being arranged lower than the first position in one direction and being arranged closer to the tool (9) than the first position; - determining, by the control device (4), a first speed of the signal transmitter (14) from the first position to the second position; - setting a first rotational speed for the drive (3) according to the first speed of the signal transmitter (14); - determining, by the control device (4), a second speed of the signal transmitter (14) from the first position to the second position; and - setting a second rotational speed for the drive (3) according to the second speed of the signal transmitter (14), the second speed having a value higher than the first speed, and the second rotational speed having a value higher than the first rotational speed.

2. The method according to claim 1, It is characterized in that The power tool (1) is a chipping hammer.

3. The method according to claim 1, Its characteristics are The following method step - sensing the first position and the third position of the signal transmitter (14) by the sensor device (13); - determining, by the control device (4), a third speed of the signal transmitter (14) from the first position to the third position; and - setting a third rotational speed for the drive (3) according to the third speed of the signal transmitter (14).

4. The method according to any one of claims 1 to 3, Its characteristics are The following method step - sensing a first position and a second position of the signal transmitter (14) by the sensor device (13); - determining, by the control device (4), the speed of the signal transmitter (14) from the first position to the second position; and - The control device (4) sets a deactivation mode for the drive (3).

5. A handle device (5) located on a power tool (1), the power tool having a drive (3), a control device (4), a transmission device (6) and a tool (9), in, The handle device (5) comprises a lever element (10) with a signal transmitter (14), wherein the lever element is pivotable relative to a housing (2) of the power tool (1). The invention is characterized in that the lever element (10) is reversibly movable relative to the housing (2) of the power tool (1) by applying a force in one direction (A), and comprises a sensor device (13) for sensing at least one first position and a second position of the lever element (10) relative to the housing (2) of the power tool (1), the second position being arranged to be lower than the first position in one direction, and the second position being arranged closer to the tool (9) than the first position, wherein the control device (4) is configured to determine a first speed of the signal transmitter (14) from the first position to the second position and to set a first rotational speed for the drive (3) according to the first speed of the signal transmitter (14), and the control device (4) is configured to determine a second speed of the signal transmitter (14) from the first position to the second position by the control device (4) and to set a second rotational speed for the drive (3) according to the second speed of the signal transmitter (14), the second speed having a value higher than the first speed, and the second rotational speed having a value higher than the first rotational speed.

6. The handle device (5) according to claim 5, It is characterized in that The power tool (1) is a chipping hammer.

7. The handle device (5) according to claim 5 or 6, It is characterized in that The signal transmitter (14) has at least one magnet, and the sensor device (13) includes at least one first Hall sensor (16a) and a second Hall sensor (16b) for sensing the at least one magnet, wherein the signal transmitter (14) is reversibly movable relative to the sensor device (13).

Images