System comprising a motor-driven cutting device and a control unit

Abstract

A system comprises a motor-driven cutting device that can be hand-held and a control unit. The cutting device can be operated via the control unit that can be remote from the cutting device. The cutting device has at least one radio receiver and the control unit has at least one radio transmitter. A safety-relevant distance between the cutting device and the control unit can be measured via a radio connection and the cutting device only be operated if the safety-relevant distance is less than a predetermined first distance value and exceeds a predetermined second distance value.

Description

DescriptionSystem comprising a Motor-driven Cutting Device and a Control UnitField of the Disclosure

[0001] The invention relates to a system comprising a motor-driven cutting device that can be used locally as a hand-held device and comprising a control unit, wherein the cutting device can be operated via the control unit, which can be arranged remotely from the cutting device, wherein the cutting device has at least one radio receiver and the control unit has at least one radio transmitter, wherein, furthermore, a distance between the cutting device and the control unit can be measured via a radio connection between the cutting device and the control unit, wherein, in addition, the cutting device can only be operated by the control unit in a first operating mode if the distance between the cutting device and the control unit, which can be measured by a distance measurement, is less than a predetermined first distance value.State of the Art

[0002] Cutting devices of the type in question, in particular those designed as motor-driven hand tools, are known in the prior art.

[0003] WO 2022 / 184939 Al and EP 2864 073 Bl (also published asUS 10,279,402 B2), cutting devices are known which, due to their design as hand-held devices, can also be used locally for cutting workpieces, for example cables, in particular electrical cables. Furthermore, from EP 3307487 Bl (also published as US 10,710,223 B2) and EP 3333 993 Bl (also published as US 10,799,962 B2) disclose a cutting device designed as a hand-held device, which is equipped with a radio connection enabling communication with a remotely positioned electronic control device. Further, a safety-relevant maximum distance (a first distance) between the control unit and thus also the user31274N1PCT 2,12,2025 mue / ni / frand the cutting device must be maintained. This document also discloses the use of a short-range radio connection, for example based on Bluetooth, whereby, in order to control the cutting device via the control unit, a determined distance between the control unit and the portable cutting device must not exceed a specified first distance value of 10 m, preferably 2 m.

[0004] EP 3 669339 Al relates to a device for remotely operating a safety processing system, in particular a safety cutting system or a safety pressing system, comprising a radio remote control that has a first radio transceiver, a controller that has a second radio transceiver, wherein the controller is able to be assigned to the safety processing system and a distance monitoring unit that is configured to determine a distance between the radio remote control and the controller.Summary of the Disclosure

[0005] Based on the prior art described above, the disclosure has the object to provide a system or a motor-driven cutting device that can be used locally as a hand-held device and enables the safest possible use.

[0006] A solution for the above-mentioned object is provided by an inventive concept involving a cutting device which can only be operated via the control unit in a first operating mode if the distance exceeds a predetermined second distance value (a minimum distance value). In order to enable the cutting device to be operated via the control unit, both a maximum distance value (a first distance value) and the minimum distance value between the cutting device and the control unit, and thus also between the cutting device and the user operating it, are required. Such a safety-relevant second distance value can be advantageous, for example, if the cutting device is to be used to cut through electrical cables that are potentially live and have been exposed in an excavation31274N1PCT 2,12,2025 mue / ni / frpit. In addition, the distance should not exceed a predetermined first distance value in order to allow the user to continue to have direct, in particular visual, control of the working area, especially for safety reasons.

[0007] It may be provided that the cutting device can be switched from the first to a second operating mode. This can be performed under special safety conditions, such as double confirmation or double actuation of a switch of the control unit. The second operating mode may also include, in particular, that although the first distance and / or the second distance do or does not meet certain safety requirements, the cutting device can still be operated. This allows the user to see the distance between the cutting device and the remote control.

[0008] Against this background, the second operating mode is, in contrast to the first operating mode, characterized in that the cutting device can be operated, when the distance between the cutting device and the control unit is equal more than the predetermined first distance value and / or when the distance between the cutting device and the control unit is equal or less than the predetermined second distance value.

[0009] It may also be provided that the cutting device can only be operated in the first operating mode and that it is not possible for a user to change the operating mode, e.g. to the second operating mode.

[0010] Generally, the cutting device can be configured to monitor and / or to record the measured distance between the cutting device and the control unit. In this way, distance data between the cutting device and the control unit is obtained, which can then be evaluated to determine the movement of a user in relation to the distance to the cutting device. Preferably, the cutting device is con-31274N1PCT 2,12,2025 mue / ni / frfigured to store and / or send the distance data, in particular via a wireless connection to an evaluation unit and / or to a data server of the system according to the invention.

[0011] The cutting device forms a system with the control unit. In an embodiment, the control unit is only connected to the cutting device via radio communication. In another embodiment, the control unit is physically connected via a cable or other flexible connector to the cutting device. The control unit may also be in radio communication with the cutting device.

[0012] The cutting device has at least one radio receiver for receiving signals sent by the control unit via a radio transmitter, in particular signals for triggering the cutting process. Accordingly, there may be a monodirectional radio connection between the control unit and the cutting device. A bidirectional radio connection is preferred, so that both the cutting device and the control unit each have a radio transmitter and a radio receiver.

[0013] The cutting device may include a cutting head and a motor part, whereby at least the radio receiver— but also, preferably, the radio transmitter-may be provided on the motor part and / or the cutting head. This may result in a distance measurement between the control unit and the cutting head and / or the motor part.

[0014] The cutting head may be connected directly to the motor part to form a handy cutting device, as is known, for example, from the aforementioned WO 2022 / 184939 Al.31274N1PCT 2,12,2025 mue / ni / fr

[0015] In an alternative embodiment, the motor part can be connected to the cutting head via a flexible power transmission line. The power transmission line can be a hydraulic line via which the motor part drives the cutting head, which is spaced apart from the motor part over the length of the power transmission line. Such a cutting device is disclosed, for example, in EP 3243 250 A2 (also published as US 11,749,977 B2). In the case of such a design of the cutting device in the sense of the alternative embodiment, the distance between the control unit and the cutting head and / or the motor part can be measured. Preferably, the distance is measured between the control unit and the motor part spaced apart from the cutting head via the power transmission line.

[0016] According to a preferred embodiment, an evaluation of the radio signals is used for the distance measurement. The bidirectional radio connection is also preferred, in particular based on Bluetooth with a transmission frequency of approximately 2.4 to 2.5 GHz, in particular 2.402 to 2.480 GHz.

[0017] Accordingly, evaluation of electromagnetic radiation is preferably used for distance measurement.

[0018] Thus, according to one possible embodiment, an evaluation of the signal strength of the radio signal received by the radio receiver can be used for distance measurement. In this context, a determined RSSI value (Received Signal Strength Indicator) can be used to determine the signal strength.

[0019] The respective radio receiver can detect the intensity of the radiation (preferably Bluetooth signal). Assuming a constant transmission power, the intensity decreases inversely proportional to the surface area of a sphere, resulting in an attenuation of approximately -6 dB when the distance is doubled.31274N1PCT 2,12,2025 mue / ni / fr

[0020] Alternatively, or, preferably, in combination, it is possible to use a phase-based check of the received radio signal to measure the distance. The measurement can be based on a multi-carrier phase slope and / or phase difference measurement (MCPD), in which the control unit forming an initiator sends a signal to the cutting head and / or motor part of the cutting device forming a reflector. The reflector (of the cutting device) measures the phase difference to its local reference value and sends a signal back on the same frequency to the initiator (control unit), which measures the phase difference to its local reference value. The initiator and reflector switch to a new frequency and repeat the measurement, whereupon the distance between the initiator and reflector, and thus between the radio receivers / transmitters of the control unit and the cutting device, is finally calculated on the basis of the measured phase differences as a function of the average of the frequencies. This calculation can be performed both in a corresponding computer unit of the cutting head and in the control unit, in particular the control unit that also serves as a remote control. If it is performed in the cutting head, it can be transmitted by radio to the control unit or the remote control.

[0021] In addition, a so-called hi-precision measurement can be used, which may be based on an estimation of the multipath channel impulse response from the frequency spectrum measurements and / or estimates of the average phase difference. In order to achieve a further improvement in the determination of the measurement result, the high-precision measurements may be passed through a median filter, for example, a median-3 filter, to filter out extreme measurement values (so-called outliers), so that a standard deviation of less than 0.5 m, more preferably about 0.37 m, is obtained. The filtering can also be applied to values determined with Inverse Fast Fourier Transform (IFFT), for example, as well as to values with lower accuracy.31274N1PCT 2,12,2025 mue / ni / fr

[0022] Furthermore, a phase-based distance measurement method can be used, which is disclosed, for example, in WO 2023 / 110787 Al. In addition, a distance measurement method known as the Nordic Distance Toolbox (NDT) from Nordic Semiconductor ASA / Norway can be used, for example.

[0023] With the help of this Nordic Distance Toolbox, all calculations for determining the distance are performed within the toolbox. There is no need to transmit the data to an external evaluation unit (with regard to the functional unit resulting from the cutting device and control unit). The distance is calculated on the basis of the available signal information, whereby the distance measurement can be performed on the basis of the measured differential physical RF channel frequency response in MCPD mode, supported if necessary by the calculation of the real-time packet flight in the RTT mode (round trip time).

[0024] According to a preferred embodiment, the second distance value (specified minimum distance value) can be 1.5 m or more. In addition, the specified minimum distance value (second distance value) of up to 10 or 15 m can be given.

[0025] The first distance value (specified maximum distance value) can also be 8 m or more, and preferably up to 20 or 25 m.

[0026] According to the disclosure, a defined distance range of, for example, approximately 8 m to approximately 15 m, more preferably approximately 10 m to approximately 12 m, may result, in which defined distance range it is preferable that triggering of the cutting device can only be carried out by remote control via the control unit. If the second distance measurement is not reached and / or the first distance measurement is exceeded, activation of the cutting device, in particular the cutting head, is preferably prevented.31274N1PCT 2,12,2025 mue / ni / fr

[0027] With regard to the distance to be measured, it is preferable to base the distance between the control unit and the cutting device on a straight line, i.e., without taking into account any obstacles that may exist in relation to the shortest connecting line between the control unit and the cutting device.

[0028] According to an embodiment disclosed herein, self-regulating, safe, remote-controlled operation of the cutting device is made possible for the user wherein the control unit and detection and evaluation electronics for measuring distance are disposed in a convenient housing, e.g. in form of a mobile phone housing. The radio connection for transmitting the trigger signal issued via the remote control (control unit) to the cutting device to trigger the cutting process is also used for distance measurement.

[0029] According to one embodiment, the distance measurement can be carried out or triggered at the same time as a switch or button on the control unit is actuated to transmit a trigger signal for the cutting device. If the determined distance is within the defined distance range, the cutting process is preferably triggered immediately in this case.

[0030] A further preferred embodiment is provided in which a distance measurement can be performed before a trigger signal is transmitted and in which, further preferably, the control unit has a second switch or button separate from the first switch or button for transmitting the trigger command. Only a distance measurement can be performed. This allows a user to obtain information as to whether the control unit, and thus the user himself, is within the specified distance range from the cutting device. Both the triggering of the distance measurement and the trigger signal for performing the cutting process can be carried out sequentially using only one switch or button, whereby the trigger signal can31274N1PCT 2,12,2025 mue / ni / fronly be transmitted if the previously performed distance measurement yields permissible first and second distance values.

[0031] In addition, a display may be provided on the control unit which visually indicates to the user the distance range at which the control unit and, by extension, the user together with the control unit are located in relation to the cutting device, in particular the motor part and / or the cutting head. Based on the display, the user can change their location if necessary and further reduce or increase the distance to the cutting device.

[0032] With regard to distance measurement, a Bluetooth connection between the cutting device and the control unit may be used, in particular. Reference is made in particular to the Bluetooth specifications version 6.0 (see also a publication by Mr. Martin Woolley dated August 6, 2024, version 1.0, available, among others, at https: / / www.bluetooth.com / core-spec:ificatio:ri-6-feature-over- view / ).

[0033] The ranges or value ranges or multiple ranges specified above and below also include all intermediate values in terms of disclosure, in particular in 1 / 10 increments of the respective dimension, i.e., if applicable, also dimensionless. For example, the specification 1.5 to 10 m also includes the disclosure of 1.6 to 10 m, 1.5 to 9.9 m, 1.6 to 9.9 m, etc. This disclosure can serve to limit a specified range from below and / or above, or alternatively or additionally to disclose one or more singular values from a respectively specified range.Brief Description of the Drawings

[0034] The disclosure is explained below with reference to the accompanying drawings, which are merely examples of embodiments. A specific component that is only explained in relation to one of the embodiments, and is not replaced31274N1PCT 2,12,2025 mue / ni / frby another component in another embodiment due to the special feature highlighted there, is thus also described as a possible component for the other embodiment. The drawings show:Fig. 1 a perspective view of an arrangement of a first embodiment of a cutting device of a first embodiment on an electrical cable exposed in an excavation pit and a control unit for controlling the cutting device and for determining the distance between the control unit and the cutting device;Fig. 2 a perspective view of an arrangement of the control unit and a second embodiment of the cutting device with a cutting head and a motor part, which are connected to each other via a power transmission line;Fig. 3 a perspective view of the control unit, which is designed as a remote control;Fig. 4 a flow chart explaining a measurement and release procedure for triggering a cutting process;Fig. 5 another perspective view of the arrangement of the cutting device and the control unit.Description of the Embodiments

[0035] First, with reference to Figure 1, a system including a motor-driven cutting device 1 and a control unit 12 is provided. The motor-driven cutting device 1 can be used locally as a hand-held device according to one possible embodiment, which is shown here only as an example in essentially pistol-like31274N1PCT 2,12,2025 mue / ni / frform with a motor part 2 having a drive housing 4 and a cutting head 3 directly connected to the motor part 2. Alternatively, the cutting device 1 can also be designed as a device that is essentially rod-like, particularly with regard to the drive housing 4.

[0036] The cutting head 3 has two cutting jaws 5 and 6, whereby one of the cutting jaws 5 or 6 can be provided as a fixed jaw and the other cutting jaw 6 or 5 provided as a movable jaw, in the embodiments as a linearly movable jaw. Between the cutting jaws 5 and 6 there is a cutting mouth 8, which is penetrated by the workpiece 9 to be cut - for example, an electrical cable - during a cutting operation.

[0037] The movable cutting jaw 6 can be moved linearly toward the fixed cutting jaw 5. This can be done, for example, with the aid of hydraulic force, which is generated by the motor part 2 when triggered by the user A. For this purpose, the motor part 2 can have a pump that can be actively started by the user A by operating a switch 10 on the device.

[0038] Furthermore, the motor part 2 is provided with a battery 7 for supplying energy to the motor part 2, in particular to the pump and other electrical or electronic devices. Alternatively, the electrical energy can also be supplied via a cable connection, although the design with the battery 7 integrated into the cutting device 1 is preferred.

[0039] The cutting device 1 could alternatively also have a spindle drive. Such a tool is known, for example, from WO 2014 / 009363 Al (US 10,468,847 B2).

[0040] The switch 10 may be provided in the area of the motor part 2, via which switch 10 the user A can start the cutting device 1 directly. Such a31274N1PCT 2,12,2025 mue / ni / frswitch 10 is not absolutely necessary for the application described in more detail below.

[0041] As an alternative to a substantially one-piece design of the cutting device 1, in which, according to Figure 1, the cutting head 3 is directly connected to the motor part 2 or to the drive housing 4, there may also be an embodiment as shown in Figure 2, in which the motor part 2 with the preferably provided pump and the battery 7 or a cable connection is formed in a separately installed drive housing 4, wherein the pump of the motor part 2 is connected to the cutting head 3 via a power transmission line 11, preferably in the form of a hydraulic line, with the cutting head 3 for driving the movable cutting jaw 6. Depending on the length of the power transmission line 11, this allows the cutting head 3 to be spaced apart from the motor part 2, for example by a distance of 3 to 5 m, or preferably up to 10 m or more.

[0042] The cutting device 1 is preferably remotely triggerable, regardless of the embodiment according to Figure 1 or Figure 2, so that the user A can maintain a safety-relevant distance b, in particular from the cutting head 3 and, furthermore, in particular from the cutting jaw 8, at the moment of performing the cutting operation.

[0043] For this purpose, user A has at his disposal the control unit 12 in the form of a remote control, via which a signal 23 for starting the cutting process can be transmitted to the cutting device 1 by a switch 13 via a radio connection S.31274N1PCT 2,12,2025 mue / ni / fr

[0044] The cutting device 1 has at least one radio receiver 15 and the control unit 12 has at least one radio transmitter 14. Preferably, both the cutting device 1 and the control unit 12 can be combined radio receiving and transmitting units, so that a bidirectional radio connection S can be established.

[0045] The radio receiver 15 is preferably provided in the motor part 2. Alternatively, but also in addition to this, it is possible for the radio receiver 15 to be provided in the area of the cutting head 3, if necessary. This can prove advantageous, for example, in the embodiment shown in Figure 2.

[0046] In addition to the aforementioned trigger signal transmission, the radio connection S can also be used to determine or measure the safety-relevant distance b between the cutting device 1 and the control unit 12, corresponding to a straight line.

[0047] The cutting device 1 can preferably only be actuated by the control unit 12 to operate in a first operating mode if the safety-relevant distance b between the cutting device 1 and the control unit 12 is less than a predetermined first distance value c and, in addition, the safety-relevant distance b exceeds a predetermined second distance value d.

[0048] Preferably, the cutting device 1 can also be actuated by the control unit 12 to operate in a second operating mode. The second operating mode is, in contrast to the first operating mode, characterized in that the cutting device 1 can be operated, when the first or safety-relevant distance b between the cutting device 1 and the control unit 12 is equal or more than the predetermined first distance value c and / or when the distance between the cutting device 1 and the control unit 12 is equal or less than the predetermined second distance value d.31274N1PCT 2,12,2025 mue / ni / fr

[0049] The control unit 12 may be configured to switch between the first operating mode and the second operating mode, preferably by the switch 13, e.g. by multiple or double actuation of the switch 13, in particular starting from the first operating mode in order to reach the second operating mode.

[0050] The cutting device 1 or system can be configured to monitor and / or to record the measured distance between the cutting device 1 and the control unit 12 in the first and / or second operating mode. In this way, distance data between the cutting device 1 and the control unit 12 are obtained, which can then be evaluated to determine the movement of a user A in relation to the distance to the cutting device 12. Preferably, the cutting device 1 is configured to store and / or send the distance data, in particular via a wireless connection to an evaluation unit and / or to a data server of the system.

[0051] In order to enable the cutting device to be operated via the control unit 12, both a maximum distance (the first distance value c) and a minimum distance (the second distance value d) between the cutting device 1 and the control unit 12 are required in order to ensure that the user A operating the cutting device 1 remains within a safety-relevant distance range from the working location of the cutting device 1, which can be considered safe in view of application-specific features. The safety-relevant second distance value d may be advantageous, or even mandatory, for example, if the cutting device 1 is to be used to cut through an electrical cable that is typically exposed in a working area 16 and may be live. Alternatively, or additionally, this may also be the case if there is a risk of explosion at the cutting site. Furthermore, the safety-relevant distance b should not exceed the first, maximum distance value c in order to allow the user A - in particular for safety reasons - to continue to have direct, in particular visual, control of the working area 16, in this case an excavation pit.31274N1PCT 2,12,2025 mue / ni / fr

[0052] According to a preferred embodiment, a radio signal evaluation of the preferably bidirectional radio connection S is used for distance measurement. In particular, a Bluetooth-based radio connection S with a transmission frequency of approximately 2.4 to 2.5 GHz, in particular 2.402 to 2.480 GHz, is preferred. Accordingly, the evaluation of electromagnetic radiation is used for distance measurement.

[0053] A preferred distance measurement is described below based on the flow chart in Figure 4.

[0054] Pressing the switch 13 provided in the control unit 12 or pressing a separate switch provided for this purpose on the control unit 12 triggers a distance measurement 17, after which a signal detector 19, which may be part of the bidirectional radio transmitter 14 as a radio receiver, receives a radio signal 18 transmitted back by the cutting device 1.

[0055] Signal detector 19 is part of detection and evaluation electronics 20 in the control unit 12.

[0056] For distance measurement, an evaluation of the signal strength of the radio signal 18 received by the signal detector 19 can be used in an embodiment. In this context, a determined RSSI value (Received Signal Strength Indicator) can be used to determine the signal strength (see RSSI module 21 in Figure 4). RSSI module 21 is part of detection and evaluation electronics 20 in the control unit 12.

[0057] Preferably, in addition to the determined RSSI value, a phase-based check of the received radio signal 18 is used in combination for distance measurement. For this purpose, the measurement can be based on a multi-carrier31274N1PCT 2,12,2025 mue / ni / frphase slope and / or phase difference measurement (MCPD) (see MCPD module 22 in Figure 4), in which the control unit 12 forming an initiator sends a signal 23 to the cutting head 3 and / or motor part 2 of the cutting device 1 forming a reflector. MCPD module 22 is part of detection and evaluation electronics 20 in the control unit 12. The reflector of the cutting device 1 measures the phase difference to its local reference value and sends a signal (radio signal 18) on the same frequency back to the initiator (control unit 12), which measures the phase difference to its local reference value. The initiator and reflector switch to a new frequency and repeat the measurement, whereupon the safety-relevant distance b between the initiator and the reflector, and thus between the radio receivers / transmitters 14 and 15 of the control unit 12 and the cutting device 1, is finally calculated on the basis of the measured phase differences as a function of the average of the frequencies.

[0058] In addition, a so-called hi-precision measurement can be used, which may be based on an estimation of the multipath channel impulse response from the frequency spectrum measurements and / or estimates of the average phase difference. In order to achieve a further improvement in the determination of the measurement result, the high-precision measurements may be passed through a median filter, for example, a median-3 filter, to filter out extreme measurement values (so-called outliers), so that a standard deviation of less than 0.5 m, more preferably about 0.37 m, is obtained. The filtering can also be applied to values determined with Inverse Fast Fourier Transform (IFFT), for example, as well as to values with lower accuracy.

[0059] The initiator of the control unit 12 can be part of the detection and evaluation electronics 20, which can be formed in the manner of a unit known as the Nordic Distance Toolbox (NDT) from Nordic Semiconductor ASA / Norway.31274N1PCT 2,12,2025 mue / ni / fr

[0060] There is no need to transmit the data to an external evaluation unit (with regard to the functional unit resulting from the cutting device 1 and control unit 12). The distance is calculated on the basis of the available signal information, whereby the distance measurement can be performed on the basis of the measured differential physical RF channel frequency response in MCPD mode, supported if necessary by the calculation of the real-time packet flight in the RTT mode (round trip time).

[0061] The safety-relevant distance b determined via the signal strength of the radio signal 18 and / or by the phase-based check of the received radio signal 18 in a determination module 24 is then compared with specified distance target values stored in a memory, i.e. with the maximum first distance value c in a comparison module 25 and at the same time with the minimum second distance value d in a comparison module 26. The determination module 24 and the comparison modules 25 and 26 are parts of detection and evaluation electronics 20 in the control unit 12.

[0062] According to a preferred embodiment, the second distance value d (minimum distance value) is 1.5 m or more, and more preferably up to 10 or 15 m.

[0063] The first distance value c (maximum distance value) can also be 8 m or more, and more preferably up to 20 or 25 m.

[0064] This results in a defined distance range R of, for example, approximately 8 m to approximately 15 m, more preferably, for example, approximately 10 m to approximately 12 m, in which defined distance range R, preferably, only remote control of the cutting device 1 can be carried out via the control unit 12 (see Figure 5).31274N1PCT 2,12,2025 mue / ni / fr

[0065] If the determined safety-relevant distance b is within the defined distance range R, a trigger module 27 can then generate and transmit a trigger signal 29 to trigger the cutting process. The trigger module 27 can be part of the control unit 12, in particular of the detection and evaluation electronics 20 in the control unit 12.

[0066] If, on the other hand, the second distance value d is not reached and / or the first distance value c is exceeded, activation of the cutting device 1, in particular the cutting head 3 in the trigger module 27, is preferably prevented. Only a renewed distance measurement - preferably after a change of location of the control unit 12 and thus the user A - can lead to a signal trigger 29 after a run of the procedure described above, provided that the safety-relevant distance b is then within the specified distance range. The measured safety-relevant distance b between the control unit 12 and the cutting device 1 is preferably determined along a straight line, i.e., without taking into account any obstacles 28 between the control unit 12 and the cutting device 1.

[0067] In addition, an optical display 30 may be provided on the control unit 12 to inform the user A of the distance range between the control unit 12 and the cutting device 1, in particular the motor part 2 and / or the cutting head 3. Based on the display 30, the user A can change their position if necessary and further reduce or increase the safety-relevant distance b to the cutting device 1.

[0068] The display 30 may include LEDs arranged in a row, which can indicate that the specified distance range has been reached, for example, by changing from a red-illuminated area to a green-illuminated area. As shown, a numerical display with meter readings may also be provided in association with the LED row.31274N1PCT 2,12,2025 mue / ni / fr

[0069] Further aspects of the present invention / disclosure are:

[0070] A motor-driven cutting device 1 that can be used locally as a hand-held device, and with a control unit 12, wherein the cutting device 1 can be operated via the control unit 12 that can be arranged remotely from the cutting device 1, wherein the cutting device 1 has at least one radio receiver 14 and the control unit 12 has at least one radio transmitter 15, wherein a distance b between the cutting device 1 and the control unit 12 can be measured via a radio connection between the cutting device 1 and the control unit 12, wherein, in addition, the cutting device 1 can only be operated by the control unit 12 in a first operating mode if the distance between the cutting device 1 and the control unit 12, which can be measured by means of a distance measurement, is less than a predetermined first distance value c and wherein, in addition, the cutting device 1 can only be operated via the control unit 12 in the first operating mode if the distance b exceeds a predetermined second distance value d.

[0071] Motor-driven cutting device 1, characterized in that the cutting device 1 is configured to be operated in a second operating mode when the measured distance is less than the predetermined first distance value c and exceeds the measured distance by the predetermined second distance value d.

[0072] Motor-driven cutting device 1, characterized in that the cutting device 1 consists of a cutting head 3 and a motor part 2, and that the radio receiver 14 is provided on the motor part 2 and / or the cutting head 3, wherein, preferably, the motor part 2 is connected to the cutting head 3 via a flexible power transmission line 11.

[0073] Motor-driven cutting device 1, characterized in that the distance measurement can be performed by evaluating the radio signals.31274N1PCT 2,12,2025 mue / ni / fr

[0074] Motor-driven cutting device 1, characterized in that a signal strength of the radio signal can be evaluated for distance measurement.

[0075] Motor-driven cutting device 1, characterized in that a phase-based check of the radio signal can be performed to measure the distance.

[0076] Motor-driven cutting device 1, characterized in that the second distance value d is 1.5 m or more.

[0077] Motor-driven cutting device 1, characterized in that the second distance value d is up to 10 m.

[0078] Motor-driven cutting device 1, characterized in that the first distance value c is 8 m or more.

[0079] Motor-driven cutting device 1, characterized in that the first distance value c is up to 20 m.31274N1PCT 2,12,2025 mue / ni / frList of reference symbols1 Cutting device 24 Determination module2 Motor part 25 Comparison module3 Cutting head 26 Comparison module4 Drive housing 27 Trigger module5 Cutting jaw 28 Obstacle6 Cutting jaw 29 Trigger signal7 Accumulator 30 Display8 Cutting mouth9 Workpiece10 Switch11 Power transmission line12 Control unit13 Switch b Distance14 Radio transmitter c First distance value15 Radio receiver d Second distance value16 Excavation pit17 Distance measurement18 Radio signal19 Signal detector20 Detection and evaluation elecA User tronics R Distance range21 RSSI module S Radio connection22 MCPD module23 Signal31274N1PCT 2,12,2025 mue / ni / fr

Claims

22Claims1. System, comprising a motor-driven cutting device (1) that can be used locally as a hand-held device, and with a control unit (12), wherein the cutting device (1) can be operated via the control unit (12) that can be arranged remotely from the cutting device (1), wherein the cutting device (1) has at least one radio receiver (15) and the control unit (12) has at least one radio transmitter (14), wherein a distance (b) between the cutting device (1) and the control unit (12) can be measured via a radio connection (S) between the cutting device (1) and the control unit (12), wherein, in addition, the cutting device (1) can only be operated by the control unit (12) in a first operating mode if the distance (b) between the cutting device (1) and the control unit (12), which can be measured by means of a distance measurement, is less than a predetermined first distance value (c) and wherein, in addition, the cutting device (1) can only be operated via the control unit (12) in the first operating mode if the distance (b) exceeds a predetermined second distance value (d).

2. System according to claim 1, characterized in that the cutting device (1) can also be operated in a second operating mode when the distance between the cutting device (1) and the control unit (12) is equal or more than the predetermined first distance value (c) and / or when the distance between the cutting device (1) and the control unit (12) is equal or less than the distance (b) of the predetermined second distance value (d).

3. System according to one of the preceding claims, characterized in that the cutting device (1) consists of a cutting head (3) and a motor part (2), and that the radio receiver (15) is provided on the motor part (2) and / or the cutting head (3), wherein, preferably, the motor part (2) is connected to the cutting head (3) via a flexible power transmission line (11).31274N1PCT 2,12,2025 mue / ni / fr4. System according to one of the preceding claims, characterized in that the distance measurement can be performed by evaluating the radio signals.

5. System according to claim 4, characterized in that a signal strength of the radio signal can be evaluated for distance measurement.

6. System according to one of claims 4 or 5, characterized in that a phasebased check of the radio signal can be performed to measure the distance.

7. System according to one of the preceding claims, characterized in that the second distance value (d) is 1.5 m or more.

8. System according to one of the preceding claims, characterized in that the second distance value (d) is up to 10 m.

9. System according to one of the preceding claims, characterized in that the first distance value (c) is 8 m or more.

10. System according to one of the preceding claims, characterized in that the first distance value (c) is up to 20 m.31274N1PCT 2,12,2025 mue / ni / fr

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