EP3833510B1 - Machine-outil portative et procédé de fonctionnement d'une machine-outil portative - Google Patents

Machine-outil portative et procédé de fonctionnement d'une machine-outil portative Download PDF

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Publication number
EP3833510B1
EP3833510B1 EP19742639.8A EP19742639A EP3833510B1 EP 3833510 B1 EP3833510 B1 EP 3833510B1 EP 19742639 A EP19742639 A EP 19742639A EP 3833510 B1 EP3833510 B1 EP 3833510B1
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EP
European Patent Office
Prior art keywords
motor
hand
magnetic field
power tool
held power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19742639.8A
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German (de)
English (en)
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EP3833510A1 (fr
Inventor
Christian Iglhaut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
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Hilti AG
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Filing date
Publication date
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Publication of EP3833510A1 publication Critical patent/EP3833510A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/064—Means for driving the impulse member using an electromagnetic drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the present invention relates to a handheld power tool and a method for operating a handheld power tool.
  • EP 2 884 463 A1 discloses a handheld power tool according to the preamble of claim 1 and a method for operating a handheld power tool according to the preamble of claim 4.
  • Hand-held power tools often have a load detection of an electric motor of the hand-held power tool.
  • the handheld power tool can then be regulated according to a determined load.
  • the load is detected by measuring the current in the electronics of the handheld power tool. The current measurement must be implemented in the power train. It is desirable to simplify and improve the load detection of an electric motor of the handheld power tool.
  • the object of the present invention is to create an improved handheld power tool and to improve a method for operating a handheld power tool.
  • a handheld power tool according to claim 1 is proposed.
  • the hand-held power tool includes a tool holder and a motor for rotating and/or percussively driving the tool holder.
  • the hand-held power tool also includes a magnetic field sensor for detecting a magnetic field of the motor that is produced by driving the tool holder.
  • the hand power tool is, for example, a hammer drill, a chisel hammer, a combination hammer, a core drill or a screwdriver.
  • the tool holder of the hand tool is used to insert a rotatable tool, e.g. B. a drill or a chisel tool.
  • the motor of the hand-held power tool is in particular an electric motor, for example an electric motor with an adjustable speed.
  • the motor of the hand-held power tool is used in particular to set the tool in a rotary motion by driving the tool holder in a rotating and/or percussive manner and/or to make a flapping movement.
  • the motor of the hand-held power tool serves to cause the tool to rotate about a working axis by rotating the tool holder about a working axis.
  • an object such as a subsurface and/or a wall
  • the motor of the hand-held power tool is also used to set the tool in a percussive motion in the percussion direction by percussively driving the tool holder in an impact direction.
  • the impact direction is in particular parallel to the working axis.
  • the impact movement of the tool can be used to chisel an object.
  • the hand-held power tool is set up, for example, in such a way that percussive driving of the tool holder only begins when an object is machined.
  • the motor of the hand-held power tool is put into operation, as a result of which the motor rotates at a specific motor speed, for example.
  • the motor By putting the motor into operation, either only the motor rotates, e.g. B. in the case of a chisel hammer, or it rotates the engine and the tool, z. B. in the case of a rotary hammer.
  • the percussive driving of the tool holder is started.
  • the tool performs percussive movements in the case of the chisel hammer and performs rotary and percussive movements in the case of the rotary hammer.
  • the handheld power tool's magnetic field sensor is located near the motor.
  • the magnetic field sensor is, for example, a Hall sensor, a magnetoresistive sensor or a field plate sensor. However, other magnetic field sensors can also be used in the hand-held power tool.
  • the magnetic field sensor detects the motor's magnetic field generated by driving the tool holder.
  • the magnetic field sensor measures a magnetic field generated by a current-carrying conductor of the motor. This means that a current measurement of the motor can be carried out indirectly with the help of the magnetic field sensor through the magnetic field measurement.
  • a motor current required for driving the tool holder is measured by detecting the magnetic field of the motor.
  • a non-contact and precise current measurement of the handheld power tool, in particular the motor can take place.
  • a non-contact and accurate load detection of the magnetic field sensor Hand tool, especially the engine done.
  • the magnetic field sensor is arranged in the handheld power tool in such a way that, as the magnetic field of the motor, it detects a magnetic field of a current that is drawn by the motor when the tool holder is driven.
  • the magnetic field sensor is arranged in particular in the area of a power line of the motor.
  • the power line of the motor is in particular a current-carrying conductor that connects a power supply of the hand-held power tool, such as a battery or a power line, to the motor.
  • a current flowing through the power line depends in particular on the power required to drive the tool holder. Consequently, a magnetic field generated by the current flowing through the power line also depends on the power required to drive the tool holder.
  • the amperage of the current flowing through the power line is small when the handheld power tool is idling under a light load, and the amperage of the current flowing through the power line is large when the handheld power tool is machining a workpiece, i.e. is operated under load.
  • the magnetic field sensor is arranged in the hand-held power tool in such a way that it detects the magnetic field of the current as the magnetic field of the motor, which is consumed by the motor when driving the tool holder, an instantaneous current intensity required for driving the tool holder can be recorded. This means that the current power consumption of the engine can be recorded.
  • the hand-held power tool has a control device for determining a load state of the motor as a function of the detected magnetic field in order to distinguish between idling operation of the hand-held power tool and load operation.
  • the control device receives the magnetic field of the motor detected by the magnetic field sensor as a signal.
  • the control device determines a load condition of the engine, for example by comparing it with specific limit values.
  • the load state of the motor is particularly dependent on a load applied to the hand-held power tool.
  • the load state of the engine is, for example, idling operation and/or low-load operation. In idling mode, the motor of the hand-held power tool is in particular in operation, but no workpiece is being machined.
  • the load state of the engine can also be a load operation and/or high-load operation, for example. In a load operation and/or high-load operation, a workpiece is machined, in particular in a rotating and/or percussive manner.
  • the handheld power tool has a control device for determining the load state of the motor as a function of the detected magnetic field
  • different load states can be recognized and differentiated from one another when the handheld power tool is in operation.
  • idle operation can be distinguished from load operation.
  • the low-load operation can be distinguished from the high-load operation.
  • a pure drilling operation can be distinguished from a drilling and percussion operation.
  • an idle operation can be distinguished from an impact operation.
  • the hand-held power tool has an operating time counter for recording an operating time of the motor as a function of the load state determined.
  • the control device has the operating time counter.
  • the operating time counter has a memory unit, for example.
  • the operating time counter is set up in particular to separately record and store the operating time of the motor for specific detected load states.
  • the operating time counter records the operating time of the engine in idling operation separately from the operating time of the engine in (high) load operation.
  • the fact that the hand-held power tool has the operating time counter for recording the operating time of the motor as a function of the load state determined can improve the recording of the motor operating time.
  • control device is set up to adjust, in particular to control or regulate, the handheld power tool as a function of the ascertained load state.
  • control device is set up to adjust the hand-held power tool as a function of the determined load condition in such a way that the engine speed of the motor is changed as a function of the determined load condition.
  • speed of the motor can be adapted to the load condition, thereby improving the energy efficiency of the motor.
  • the handheld power tool can be adjusted very well, in particular controlled or regulated very well.
  • a method for operating a handheld power tool according to claim 4 is proposed.
  • the hand-held power tool has a tool holder and a motor for rotating and/or percussively driving the tool holder.
  • the method has a step of detecting a magnetic field of the motor that is produced by driving the tool holder.
  • the method also has a step of determining a load state of the motor as a function of the detected magnetic field.
  • the step of detecting the magnetic field of the motor includes detecting a magnetic field of a current drawn by the motor when the tool holder is driven.
  • the magnetic field of the current that is picked up by the motor when the tool holder is driven is detected, for example, by detecting the magnetic field of the current that flows through the power line described in connection with the hand-held power tool.
  • chiseling operation of the hand-held power tool is detected when the load state determined exceeds a specific limit value.
  • the chiseling operation of the hand-held power tool is detected when the detected magnetic field and/or the current intensity determined from the detected magnetic field exceeds the specific limit value.
  • the control device compares the detected magnetic field and/or the current intensity determined from the detected magnetic field with the specific limit value.
  • the specific limit value is, for example, a specific magnetic field strength and/or a specific current strength. Because the chiseling operation of the handheld power tool can be detected using the magnetic field sensor, the handheld power tool can be set depending on whether chiseling operation is present or not.
  • the method has a step of determining an operating time of the engine as a function of the load state determined.
  • the operating time of the motor is determined, for example, by the operating time counter described in connection with the hand-held power tool.
  • determining the load state of the motor as a function of the detected magnetic field includes distinguishing between idle operation of the handheld power tool and load operation.
  • the hand-held power tool can be set depending on whether idle operation or load operation is present.
  • the hand-held power tool is a hammer drill and the determination of the load state of the motor as a function of the detected magnetic field includes distinguishing between pure drilling operation and drilling and percussion operation.
  • the hammer drill has three different operating states.
  • the motor and the drill rotate, but no workpiece is machined.
  • the motor and the drill rotate, and the drill processes a workpiece by rotating about the work axis.
  • the motor and the drill rotate, and the drill processes a workpiece by rotating about the working axis and percussing in the direction of impact.
  • determining the load state of the motor as a function of the detected magnetic field can include distinguishing between no-load operation, pure drilling operation and drilling and percussion operation.
  • the hammer drill can be set depending on whether idle operation, pure drilling operation or drilling and percussion operation is present.
  • the hand-held power tool is a chipping hammer and the determination of the load state of the motor as a function of the detected magnetic field includes a distinction between idling operation and percussion operation.
  • the chipping hammer has two different operating states.
  • the motor rotates, but no workpiece is machined.
  • the motor rotates and the chisel tool machines a workpiece by percussive movement in the percussion direction.
  • the hand-held power tool can be set depending on whether the chisel hammer is in idling operation or percussion operation.
  • the method has a step of setting the hand power tool as a function of the determined load state.
  • the setting is, for example, controlling the hand-held power tool as a function of the load state determined.
  • the setting can also be a regulation of the hand-held power tool depending on the load state determined.
  • the setting of the hand-held power tool as a function of the determined load state includes changing a motor speed of the motor as a function of the determined load state.
  • the control device has, for example, a processor and a computer program executed with the aid of the processor.
  • the control device for example the computer program, includes in particular an algorithm or several algorithms which is/are set up to determine a load state of the motor depending on the detected magnetic field and/or to adjust the hand-held power tool depending on the load state determined.
  • the respective unit for example the processor, can be implemented in terms of hardware and/or software.
  • the unit can be designed as a device or as part of a device, for example as a computer or as a microprocessor.
  • the unit can be embodied as a computer program product, as a function, as a routine, as part of a program code or as an executable object.
  • a computer program product such as a computer program means
  • a server in a network, for example, as a storage medium such as a memory card, USB stick, CD-ROM, DVD, or in the form of a downloadable file. This can be done, for example, in a wireless communication network by transferring a corresponding file with the computer program product or the computer program means.
  • the rotary hammer 1 shows a hammer drill as an exemplary embodiment of the hand-held power tool 1 .
  • the rotary hammer 1 has a tool holder 2, in which a shank end of a tool 3, z. B. a drill can be used.
  • a motor 4 which drives a percussion mechanism 5 and a drive shaft 6 , forms a primary drive of the hammer drill 1 .
  • An accumulator 7 or a power line (not shown) supplies the motor 4 with power via a power line 17 . in the in 1 The example shown supplies the accumulator 7 with power to the motor 4 and is connected to the motor 4 by the power line 17 for this purpose.
  • a user can hold and guide the hammer drill 1 by a handle 8 .
  • the handle 8 is part of a housing 9 of the rotary hammer 1.
  • the rotary hammer 1 can be put into operation by means of a main switch 10.
  • the motor 4 By pressing the main button 10, the motor 4 is supplied with power from the accumulator 7 via the power line 17.
  • the latter drives the drive shaft 6.
  • the drive shaft 6 coupled to the tool holder 2 causes the tool holder 2 to rotate about a working axis 11 .
  • the tool 3 is rotated about the working axis 11 .
  • the rotary hammer 1 can hit the tool 3 in addition to rotating about the working axis 11 in a direction of impact 12 along the working axis 11 into a substrate.
  • the hammer drill 1 is set up in such a way that the impact movement of the tool 3 only begins when an object is processed. For example, pressing the switched-on rotary hammer 1 against the object to be machined starts driving the tool holder 2 through the impact mechanism 5. Because the impact mechanism 5 drives the tool holder 2, the tool 3 performs impact movements in the impact direction in addition to the rotary movement about the working axis 11 12 out.
  • the rotary hammer 1 has an operating selector switch 13, through which the tool holder 2 can be decoupled from the drive shaft 6, so that purely chiseling operation of the rotary hammer 1 is possible.
  • FIG. 1 shows a schematic view of a method for operating the hammer drill 1.
  • FIG 1 shows a schematic view of a method for operating the hammer drill 1.
  • a magnetic field of the motor 4 produced by the driving of the tool holder 2 is detected.
  • the hammer drill 1 has a magnetic field sensor 14 adjacent to the motor 4, in particular adjacent to the power line 17, for detecting the load of the motor 4, as shown in FIG 1 to see.
  • the current required for rotating and/or percussive driving of the tool holder 2 flows through the power line 17 to the motor 4 and generates a magnetic field around the power line 17.
  • the magnetic field sensor 14 detects the magnetic field of the motor 4, in particular of the power line 17.
  • a load condition of the motor 4 is determined as a function of the detected magnetic field.
  • the strength of the current flowing through the power line 17 depends on the instantaneous power consumption of the motor 4 of the rotary hammer 1 .
  • the strength of the magnetic field generated by the current flowing through the power line 17 is therefore also dependent on the instantaneous power consumption of the motor 4 of the rotary hammer 1 .
  • the motor 4 By pressing the main button 10, the motor 4 is set in rotation. As long as the tool 3 is not yet machining the workpiece, ie the hammer drill 1 is in idling mode, the load applied to the motor 4 is low and the power consumption of the motor 4 is correspondingly low. In this state, a current of a small amperage flows through the current conductor 17, which generates weak magnetic current around the current conductor 17. If a workpiece is now machined with the tool 3, the load applied to the motor 4 and the power consumed by the motor 4 increase in comparison to idling operation.
  • the amperage of the current flowing through the conductor 17 and the strength of the magnetic field generated by the current around the conductor 17 increase the load applied to the motor 4 further.
  • the load of the motor is correspondingly large and a current with a large current flows through the conductor 17. A strong magnetic current around the conductor 17 is thereby generated.
  • these different load states can be determined and differentiated by a control device 15 of the rotary hammer 1 in the second step S2 of the method.
  • the magnetic field sensor 14 transmits the detected magnetic field as a signal to the control device 15.
  • the control device 15 compares the detected Magnetic field with certain limit values and thus determines whether idle operation, pure drilling operation or drilling and percussion operation is present.
  • the specific limit values are specific values for the magnetic field strength. For example, the control device 15 determines that idle operation is present when the detected magnetic field is less than a first limit value.
  • control device 15 determines that a pure drilling operation is taking place when the detected magnetic field is greater than or equal to the first limit value and less than a second limit value. For example, the control device 15 determines that a drilling and percussion operation is taking place when the detected magnetic field is greater than or equal to the second limit value.
  • an operating time of the engine 4 is determined as a function of the load state determined.
  • the hammer drill 1, in particular the control device 15, can have, for example, an operating time counter 16 for recording the operating time of the motor 4 as a function of the load condition determined, as in 1 to see.
  • the control device 15 and/or the operating time counter 16 have, for example, a storage unit (not shown) for storing the recorded operating time as a function of the ascertained load state.
  • the operating time counter 16 records the operating time of the motor 4 continuously or at short time intervals, for example from the time the main button 10 is actuated, and assigns it to the load state determined by the control device 15 . For example, after the rotary hammer 1 has been switched on via the main button 10, the operating time counter 16 first records an operating time in idle mode, followed by an operating time in drilling and percussion mode.
  • the hammer drill 1 is adjusted, in particular controlled, as a function of the determined load condition. For example, the engine speed of the engine 4 is changed depending on the determined load condition. For example, the engine speed is reduced in the idle operation and the engine speed is increased in the percussion and drilling operations. The energy consumption of the hammer drill 1 can be reduced by this adjustment of the engine speed to the load condition of the hammer drill 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (11)

  1. Machine-outil portative (1) comprenant
    un attachement d'outil (2),
    un moteur (4) destiné à entraîner l'attachement d'outil (2) en rotation et/ou en frappe et un détecteur de champ magnétique (14) destiné à détecter un champ magnétique du moteur (4) qui est produit par l'entraînement de l'attachement d'outil, le détecteur de champ magnétique (14) étant disposé dans la machine-outil portative (1) de telle sorte qu'il détecte, en tant que champ magnétique du moteur (4), un champ magnétique d'un courant qui est absorbé par le moteur (4) lors de l'entraînement de l'attachement d'outil, caractérisée en ce que la machine-outil portative possède un dispositif de commande (15) destiné à déterminer un état de charge du moteur (4) en fonction du champ magnétique détecté en vue de différencier un fonctionnement à vide de la machine-outil portative (1) d'un fonctionnement en charge.
  2. Machine-outil portative (1) selon la revendication 1, caractérisée en ce qu'elle possède un compteur d'heures de fonctionnement (16) destiné à acquérir une durée de fonctionnement du moteur (4) en fonction de l'état de charge déterminé.
  3. Machine-outil portative (1) selon la revendication 1 ou 2, caractérisée en ce que le dispositif de commande (15) est conçu pour régler la machine-outil portative (1) en fonction de l'état de charge déterminé.
  4. Procédé pour faire fonctionner une machine-outil portative (1), laquelle possède un attachement d'outil (2) et un moteur (4) destiné à entraîner l'attachement d'outil (2) en rotation et/ou en frappe, comprenant les étapes suivantes :
    détection (S1) d'un champ magnétique du moteur (4) qui est produit par l'entraînement de l'attachement d'outil (2) et
    détermination (S2) d'un état de charge du moteur (4) en fonction du champ magnétique détecté,
    caractérisé en ce que la détermination (S2) de l'état de charge du moteur (4) en fonction du champ magnétique détecté présente une différenciation d'un fonctionnement à vide de la machine-outil portative (1) d'un fonctionnement en charge.
  5. Procédé selon la revendication 4, caractérisé en ce que la détection (S1) du champ magnétique du moteur (4) présente une détection d'un champ magnétique d'un courant qui est absorbé par le moteur (4) lors de l'entraînement de l'attachement d'outil (2).
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce qu'un fonctionnement en burinage de la machine-outil portative (1) est reconnu lorsque l'état de charge déterminé dépasse une valeur limite déterminée.
  7. Procédé selon l'une des revendications 4 à 6, caractérisé par une étape :
    détermination (S3) d'un temps de fonctionnement du moteur (4) en fonction de l'état de charge déterminé.
  8. Procédé selon l'une des revendications 6 ou 7, caractérisé en ce que la machine-outil portative (1) est un marteau perforateur et la détermination (S2) de l'état de charge du moteur (4) en fonction du champ magnétique détecté présente une différenciation d'un fonctionnement en perforation pure d'un fonctionnement en perforation et frappe.
  9. Procédé selon la revendication 4, caractérisé en ce que la machine-outil portative (1) est un marteau burineur et la détermination (S2) de l'état de charge du moteur (4) en fonction du champ magnétique détecté présente une différenciation d'un fonctionnement à vide d'un fonctionnement en frappe.
  10. Procédé selon l'une des revendications 4 à 8, caractérisé par une étape :
    réglage (S4) de la machine-outil portative (1) en fonction de l'état de charge déterminé.
  11. Procédé selon la revendication 10, caractérisé en ce que le réglage (S4) de la machine-outil portative (1) en fonction de l'état de charge déterminé présente une modification d'une vitesse de rotation de moteur du moteur (4) en fonction de l'état de charge déterminé.
EP19742639.8A 2018-08-07 2019-07-30 Machine-outil portative et procédé de fonctionnement d'une machine-outil portative Active EP3833510B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18187655.8A EP3608063A1 (fr) 2018-08-07 2018-08-07 Machine-outil portative et procédé de fonctionnement d'une machine-outil portative
PCT/EP2019/070477 WO2020030468A1 (fr) 2018-08-07 2019-07-30 Machine-outil portative et procédé pour faire fonctionner une machine-outil portative

Publications (2)

Publication Number Publication Date
EP3833510A1 EP3833510A1 (fr) 2021-06-16
EP3833510B1 true EP3833510B1 (fr) 2022-09-07

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EP18187655.8A Withdrawn EP3608063A1 (fr) 2018-08-07 2018-08-07 Machine-outil portative et procédé de fonctionnement d'une machine-outil portative
EP19742639.8A Active EP3833510B1 (fr) 2018-08-07 2019-07-30 Machine-outil portative et procédé de fonctionnement d'une machine-outil portative

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EP18187655.8A Withdrawn EP3608063A1 (fr) 2018-08-07 2018-08-07 Machine-outil portative et procédé de fonctionnement d'une machine-outil portative

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US (1) US11597067B2 (fr)
EP (2) EP3608063A1 (fr)
WO (1) WO2020030468A1 (fr)

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JP6235872B2 (ja) * 2013-11-07 2017-11-22 株式会社マキタ 作業工具
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JP7139128B2 (ja) * 2018-03-21 2022-09-20 株式会社マキタ 作業工具
WO2022010851A1 (fr) * 2020-07-06 2022-01-13 Milwaukee Electric Tool Corporation Détection automatique de charge de rampe pour outils électriques

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WO2020030468A1 (fr) 2020-02-13
US11597067B2 (en) 2023-03-07
EP3608063A1 (fr) 2020-02-12
EP3833510A1 (fr) 2021-06-16

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