EP4292767A1 - Outil de travail guidé à la main - Google Patents

Outil de travail guidé à la main Download PDF

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Publication number
EP4292767A1
EP4292767A1 EP22178857.3A EP22178857A EP4292767A1 EP 4292767 A1 EP4292767 A1 EP 4292767A1 EP 22178857 A EP22178857 A EP 22178857A EP 4292767 A1 EP4292767 A1 EP 4292767A1
Authority
EP
European Patent Office
Prior art keywords
actuating element
switching
hall sensor
actuating
working device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22178857.3A
Other languages
German (de)
English (en)
Inventor
Florian Hoche
Alexander Haas
Georg Heinzelmann
Christian Schmidt
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.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Priority to EP22178857.3A priority Critical patent/EP4292767A1/fr
Publication of EP4292767A1 publication Critical patent/EP4292767A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor

Definitions

  • the invention relates to a hand-held implement of the type specified in the preamble of claim 1.
  • Working devices which include a housing, a drive motor arranged in the housing and a tool driven by the drive motor.
  • Corresponding implements have an actuating element for actuating the drive motor.
  • the actuating element is operatively connected to a locking element, the locking element locking the actuating element in a locking position and releasing it in an operating position.
  • work devices can also have switches which, in addition to the locking element, also have to be actuated in order to transmit a corresponding release signal to a control of the work device and thus enable the operation of the work device.
  • the invention is therefore based on the object of creating a hand-held implement of the generic type, which enables improved commissioning of the implement.
  • the hand-held work tool comprises a housing, a tool and a drive motor arranged in the housing for driving the tool, a switching unit for actuating the drive motor for driving the tool, at least one actuating element, wherein the at least one actuating element can be switched into at least a first position and into a second position, an electronic switch for detecting the switching positions of the at least one actuating element, the electronic switch generating a status signal which is dependent on the switching positions of the actuating element and a controller, wherein the controller Depending on the status signal of the electronic switch, the operational readiness of the drive motor switches.
  • the electronic switch comprises a switching element with a Hall sensor and an actuating element designed separately from the switching element, the actuating element for actuating the switching element being in operative connection with the Hall sensor and on which at least one actuating element is arranged.
  • the triggering mechanism of the electronic switch is no longer based on a mechanical operating principle.
  • the Hall sensor is activated without contact.
  • the switching element comprises a circuit, with the Hall sensor being part of the circuit.
  • the Hall sensor is particularly preferably arranged on a circuit board. This means that the effect of the Hall sensor when activated is not limited to closing or opening a circuit.
  • the status signal emanating from the switching element is therefore an information signal that can be evaluated via the controller. Both in the first position and in the second position of the actuating element, a corresponding status signal is sent from the switching element to the controller, whereby the controller can draw conclusions about the switching state of the actuating element.
  • the actuating element is designed as a magnet for actuating the switching element. If the magnet is moved relative to the Hall sensor, the magnetic field and the magnetic flux density that flows through the Hall sensor changes. Consequently, the position of the control element can be determined via the Hall sensor.
  • the actuating element can also be used as Shielding element can be designed to interrupt the magnetic field between the magnet and Hall sensor. In such an embodiment, the magnet and Hall sensor are firmly fixed relative to each other. The change in the magnetic field and the magnetic flux density that flows through the Hall sensor occurs by introducing the shielding element into the magnetic field. In the second position of the control element, the shielding element is preferably arranged between the magnet and the Hall sensor, so that the magnetic flux density flowing through the Hall sensor is reduced.
  • the actuating element is a locking lever, the locking lever releasing the switching unit for actuation in the first position and locking it in the second position.
  • the working device comprises a braking device with a brake lever, wherein the at least one actuating element corresponds to the brake lever of the braking device. This allows the position of the brake lever to be determined by the controller.
  • the actuating element is mechanically connected to the switching unit in at least one of its at least two positions.
  • the actuating element preferably blocks the switching unit mechanically in the first position.
  • the actuating element preferably releases the switching unit in the second position.
  • the drive motor is therefore started up via both a mechanical and an electronic safety mechanism.
  • the actuating element is preferably arranged on the actuating element in such a way that the mechanical switching state of the actuating element is coupled to the electrical switching state of the electronic switch.
  • a further actuating element is provided with a further actuating element for actuating the switching element.
  • the further actuating element is preferably arranged on the switching element of the electronic switch.
  • a working device 1 is shown, which is designed as a motor chainsaw.
  • the working device 1 comprises a housing 2 and a drive motor 3 arranged in the housing 2.
  • the drive motor 3 is only shown schematically by a dashed rectangle.
  • the drive motor 3 is an electric motor, but can alternatively also be designed as an internal combustion engine.
  • the drive motor 3 is supplied with energy via a battery or a connecting cable.
  • the working device includes a tool 4 driven by the drive motor 3, which in the exemplary embodiment is designed as a saw chain.
  • a rear handle 36 and a handle tube 37 for guiding the implement 1 are fixed to the housing 2.
  • a guide rail 38 projects forward.
  • the saw chain is arranged all around on the guide rail 38.
  • the hand-held implement can also be, for example, a power cutter, a blower, a brush cutter, a hedge trimmer or similar.
  • the drive motor 3 drives a drive shaft which protrudes from the housing 2.
  • a drive sprocket is arranged on the drive shaft.
  • the drive sprocket is used for Drive of the saw chain, which is guided over the drive sprocket during operation.
  • the working device 1 further comprises a tensioning device, via which the guide rail 38 can be moved forward in its longitudinal direction away from the drive sprocket, and thus the saw chain can be tensioned.
  • the guide rail 38 has a longitudinal axis 40.
  • the longitudinal axis 40 runs centrally through the guide rail 38 approximately parallel to the horizontal floor 41.
  • the term “approximately” is to be understood in this way that the longitudinal axis 40 forms an angle of at most 15° with the floor 41.
  • the guide rail 38 has a longitudinal plane 42, which contains the longitudinal axis 40 when the implement 1 is parked on a flat horizontal floor 41 and is perpendicular to the floor 41.
  • the housing 2 has a handle section 5, the handle section 5 being provided on the rear handle 36 in the exemplary embodiment.
  • the working device 1 has a switching unit 8 for actuating the drive motor 3.
  • the switching unit 8 is provided on the handle section 5 in the exemplary embodiment.
  • the switching unit 8 is designed as a switching lever in the exemplary embodiment.
  • the working device 1 comprises at least one actuating element 9.
  • the actuating element 9 can be switched to at least a first position 51 and a second position 52.
  • the adjusting element 9 is designed as a locking lever.
  • the actuating element 9 serves to mechanically lock and release the switching unit 8.
  • the actuating element 9 mechanically locks the switching unit 8 in the first position 51 ( Fig. 2 ) and returns the switching unit 8 to a second position 52 ( Fig. 3 ) free.
  • the handle section 5 has a top 6 and a bottom 7 opposite the top 6.
  • the handle section 5 is a part of the housing 2, on which the switching unit 8 and the actuating element 9 are arranged.
  • the adjusting element 9 is arranged on the top 6.
  • the switching unit 8 is arranged on the underside 7 of the handle section 5.
  • the handle section 5 preferably also includes a handle area 43, which is provided for holding the working device 1 when the working device 1 is in operation.
  • the actuating element 9 is mounted on the housing 2 so that it can pivot about a first pivot axis 15.
  • the working device 1 comprises a first return spring 19, the first return spring 19 acting on the adjusting element 9 and biasing the adjusting element 9 into the first position 51 of the adjusting element 9.
  • the first return spring 19 is designed as a leg spring in the exemplary embodiment.
  • the return spring 19 is arranged on the housing 2 and acts with one leg on the actuating element 9.
  • the switching unit 8 is mounted on the housing 2 so that it can pivot about a second pivot axis 16.
  • the working device 1 has a second return spring, not shown, wherein the second return spring acts on the switching unit 8 and biases the switching unit 8 into an inoperative position. In the inoperative position, the drive motor 3 is unactuated.
  • a locking contour 34 is formed on the actuating element 9, which blocks the switching unit 8 when pivoting into an operating position in the first position 51 of the actuating element 9. If the switching unit 8 is pressed while the control element 9 is in the first position 51, the switching unit 8 abuts with its holding contour 35 against the locking contour 34 of the control element 9. The switching unit 8 is blocked by the locking contour 34. Only by pivoting the adjusting element 9 into the second position 52 is the switching unit 8 released, whereby the switching unit 8 can be pivoted into the operating position.
  • the working device 1 comprises an electronic switch 10 for detecting the switching positions of the at least one actuating element 9.
  • the electronic switch 10 comprises a switching element 11 with a Hall sensor 12 and an actuating element 13 which is designed separately from the switching element 11.
  • the actuating element 13 is connected to the Hall sensor 12 operatively connected.
  • the switching element 11 with the Hall sensor 12 is arranged on the housing 2, in particular on the handle section 5, of the working device 1.
  • the switching element 11 with the Hall sensor 12 is firmly connected to the housing 2, in particular to the handle section 5.
  • the actuating element 13 is arranged on the actuating element 9.
  • the actuating element 13 is designed to be movable relative to the switching element 11 with the Hall sensor 12.
  • the actuating element 13 is designed as a magnet in the preferred exemplary embodiment.
  • the magnet creates a magnetic field.
  • a magnetic field flows through the Hall sensor 12.
  • the Hall sensor 12 Depending on the magnetic flux density and the current, the Hall sensor 12 generates an output voltage.
  • the electronic switch 10 generates a status signal.
  • the status signal depends on the output voltage of the Hall sensor 12.
  • the status signal is received by a schematically shown controller 17.
  • the status signal of the electronic switch 10 in the first position 51 of the control element 9 is a blocking signal. In the first position 51 of the adjusting element 9, the adjusting element 9 is not actuated. In the second position 51, in the exemplary embodiment, the actuating element 13 is arranged at such a distance from the Hall sensor 12 that the intensity of the magnetic field on the Hall sensor 12 is low. Consequently, the output voltage present at the Hall sensor 12 is also low. In the second position 52 of the control element 9, the status signal of the electronic switch 10 is a release signal. In the second position 52 of the adjusting element 9, the adjusting element 9 is actuated.
  • the actuating element 13 is arranged at such a distance from the Hall sensor 12 that the intensity of the magnetic field on the Hall sensor 12 is greater than in the first position 51.
  • the distance between the actuating element 13 and the Hall sensor 12 is smaller than in the second position 52.
  • the controller 17 is used to control the drive motor 3.
  • the controller 17 is designed as a computer-based control unit that is used for computer-aided signal processing. Consequently, the signal sent by the electronic switch 10 can be an information signal that is further processed in the controller 17.
  • the controller 17 is connected to the electronic switch 10 via a connecting line 18.
  • the connecting line 18 is in the Figures 2 to 4 only shown schematically in dashed lines.
  • the connection between the electrical switch 10 and the controller 17 can also be wireless, in particular via radio.
  • the controller 17 is designed in such a way that the drive motor 3 is only released by the controller 17 when a group of operating conditions are met. At least one operating condition of the group of operating conditions is the receipt of the status signal sent by the electronic switch 10, an enable signal. In an alternative embodiment of the working device 1, it can also be provided to provide further operating conditions, such as the activation of an on-off switch of the working device 1, upon fulfillment of which the operation of the drive motor 3 is enabled by the controller 17.
  • the controller 17 is designed in such a way that when the blocking signal from the electronic switch 10 is received, the controller blocks the operation of the drive motor 3. Furthermore, the controller 17 blocks the operation of the drive motor 3 even if the controller 17 does not receive a status signal from the electronic switch 10.
  • the actuating element 9 In order to be able to activate the drive motor 3, the actuating element 9 must be actuated in the present embodiment of the implement 1. On the one hand, this creates the switching unit 8 is released mechanically, on the other hand the electronic switch 10 is activated, which sends a release signal to the controller 17. As a result, the drive motor 3 is enabled by the control circuit 17. In an alternative embodiment of the working device 1, it can also be provided that the actuation of the actuating element 9 only results in an electronic release for the drive motor 3 to be ready for operation. In such an embodiment, the shift lever 8 cannot be mechanically locked by the actuating element 9.
  • the actuating element 13 has a distance a from the pivot axis 15 of the adjusting element 9. Furthermore, the adjusting element 9 has an extension radius r, which corresponds to the maximum distance between an outer contour 33 of the adjusting element 9 and the first pivot axis 15 of the adjusting element 9.
  • the distance a between the actuating element 13 and the pivot axis 15 of the adjusting element 9 preferably corresponds to at least 60%, in particular at least 80%, preferably at least 90%, preferably at least 95% of the extension radius r.
  • the actuating element 13 is to be arranged as far away as possible from the first pivot axis 15 of the actuating element 9, so that the actuating element 13 is moved over the greatest possible distance when the pivoting angle of the actuating element 9 is already small. This results in an increased change in the magnetic flux density, so that the switching points from the first position 51 to the second position 52 can be determined very precisely.
  • the electronic switch 10 generates a continuously changeable status signal.
  • the continuously variable state signal depends on a sensor distance b, whereby the sensor distance b corresponds to the distance between the actuating element 13 and the Hall sensor 12. As the sensor distance b reduces, the magnetic flux density at the Hall sensor 12 increases, as a result of which the output voltage of the Hall sensor 12 also increases.
  • the control 17 is designed in such a way that it can be continuously changed State signal of the Hall sensor 12 can in particular continuously determine the position of the adjusting element 9, in particular the angular position of the adjusting element 9.
  • the continuously variable status signal can thus be used analogously to the signal from a rotary encoder to determine the angular position of the adjusting element 9.
  • a magnet and the switching element 11 with the Hall sensor 12 are firmly fixed relative to one another. Accordingly, the magnet and the Hall sensor 12 cannot be moved relative to one another.
  • the magnet is arranged opposite the Hall sensor 12 in such a way that the magnet is in operative connection with the Hall sensor 12, i.e. the magnetic field of the magnet 12 acts on the Hall sensor 12.
  • the actuating element 13 arranged on the actuating element 9 is designed as a shielding element.
  • the actuating element 13 is arranged to be movable relative to the switching element 11 with the Hall sensor 12 and to the magnet. An effective zone is formed between the Hall sensor 12 and the magnet.
  • the actuating element 13 designed as a shielding element, is arranged outside the effective zone.
  • the magnet acts on the Hall sensor 12, whereby the switching element 11 outputs the status signal to the controller 17 as a release signal.
  • the adjusting element 9 is located between the magnet and the Hall sensor 12 in the effective zone. This shields the Hall sensor 12 from the magnetic field emanating from the magnet.
  • the switching element 11 sends the status signal as a release signal to the controller 17.
  • the switching element 11 is designed as a circuit board.
  • the Hall sensor 12 is attached to the circuit board. Accordingly, the Hall sensor 12 is preferably a Hall sensor 12 integrated in the circuit board.
  • the Hall sensor 12 is therefore part of the circuit of the switching element 11.
  • the switching element 11 preferably includes signal amplification, an analog-digital conversion, and digital signal processing and/or offset and temperature compensation.
  • the Hall sensor 12 is preferably as a lateral Hall sensor or as vertical Hall sensor formed. In an alternative embodiment, it may also be expedient to design the Hall sensor 12 as a 3D Hall sensor. It can also be expedient to design the Hall sensor 12 as a gradient Hall sensor.
  • Fig. 4 an alternative embodiment of the hand-held working device 1 is shown, the working device 1 comprising a further actuating element 14.
  • the further actuating element 14 is preferably designed as a magnet.
  • the further actuating element 14 interacts with the Hall sensor 12 in the preferred embodiment.
  • the further actuating element 14 is provided on a further actuating element 30.
  • the further actuating element 30 in the exemplary embodiment is the switching unit 8.
  • the further actuating element 14 is preferably arranged on an outer contour 32 of the switching unit 8. Accordingly, when the switching unit 8 is pivoted about the second pivot axis 16, the further actuating unit 14 is also pivoted. Accordingly, the further actuation unit 14 is arranged to be movable relative to the Hall sensor 12.
  • the further actuating element 14 is arranged on the switching unit 8 in such a way that the further actuating element 14 has a maximum distance from the Hall sensor 12 in the inoperative position of the switching unit 8. In the operating position of the switching unit 8, the actuating element 14 has a smaller distance from the Hall sensor 12 than the maximum distance. As a result, the magnetic flux density that flows through the Hall sensor 12 is increased, as a result of which the output voltage of the Hall sensor 12 is also increased.
  • the electronic switch 10 sends a first signal to the control unit 17 when the switching unit 8 is in the inoperative position.
  • the electronic switch 10 sends a second signal to the control unit 17 when the switching unit 8 is in the operating position.
  • the control unit 17 is designed in such a way that when it receives the Firstly, the signal from the electronic switch 10 does not actuate the drive motor 3.
  • the control unit 17 is designed in such a way that it actuates the drive motor 3 upon receipt of the second signal from the electronic switch 10.
  • the electronic switch 10 generates a continuously variable status signal depending on the distance of the further actuating element 14 from the Hall sensor 12. The dependence of the constantly changing status signal has already been described above.
  • the controller 17 is designed in such a way that it can determine, in particular continuously, the position of the switching unit 8, in particular the angular position of the switching unit 8, by means of the continuously variable status signal of the Hall sensor 12. Based on this status signal, the controller 17 controls the drive motor 3, preferably continuously.
  • the electronic switch 10 is arranged in such a way that it can detect the magnetic fields caused by the movements of the actuating element 13 and the further actuating element 14.
  • the actuating element 13 arranged on the actuating element 9 is arranged on a switching tongue 31 of the actuating element 9, which extends in the direction of the electronic switch 10.
  • the actuating element 13 and the further actuating element 14 act on the only one Hall sensor 12.
  • the controller 17 is designed in such a way that the positions of the actuating element 9 and the switching unit 8 are only based on the signals received from the one electronic switch 10 recognizes.
  • the Hall sensor 12 is preferably arranged as a 3D Hall sensor. As a result, the Hall sensor 12 can also detect the magnetic fields of the actuating elements 13, 14 that are not aligned perpendicular to the Hall sensor 12.
  • the working device 1 comprises two Hall sensors, both of which are arranged on the one switching element 11 designed as a circuit board. Each Hall sensor is assigned to an actuating element 13, 14.
  • the implement 1 includes a braking device with a brake lever.
  • the braking device is used to brake the tool.
  • the braking device works for this purpose preferably on a drive element, the drive element being driven by the drive motor 3 and acting on the tool 4.
  • the control element 9 of the implement 1 may be designed as a brake lever.
  • the actuating element 13 is arranged on the brake lever. When the brake lever moves, the actuating element 13 is moved relative to the Hall sensor 12, whereby the controller 17 can detect the position of the brake lever and thus also the state of the braking device via the status signals emitted by the switching element 11. Based on this information, the controller 17 can enable or disable the operational readiness of the drive motor 3.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
EP22178857.3A 2022-06-14 2022-06-14 Outil de travail guidé à la main Pending EP4292767A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22178857.3A EP4292767A1 (fr) 2022-06-14 2022-06-14 Outil de travail guidé à la main

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22178857.3A EP4292767A1 (fr) 2022-06-14 2022-06-14 Outil de travail guidé à la main

Publications (1)

Publication Number Publication Date
EP4292767A1 true EP4292767A1 (fr) 2023-12-20

Family

ID=82058343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22178857.3A Pending EP4292767A1 (fr) 2022-06-14 2022-06-14 Outil de travail guidé à la main

Country Status (1)

Country Link
EP (1) EP4292767A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003061913A1 (fr) * 2002-01-18 2003-07-31 George Stephen Ramsay Poignees de declenchement pour outils electriques, appareils et armes a feu
EP1895555A2 (fr) * 2006-08-30 2008-03-05 Robert Bosch Gmbh Machine-outil manuelle
EP2460399A1 (fr) * 2010-12-02 2012-06-06 PELLENC (Société Anonyme) Outil aérien portatif, en particulier pour utilisation en arboriculture fruitière ou pour l'entretien d'espaces verts
EP3354892A1 (fr) * 2017-01-30 2018-08-01 Andreas Stihl AG & Co. KG Outil de travail portatif comprenant un moteur à combustion et un dispositif de démarrage électrique
EP3456949A1 (fr) * 2017-09-15 2019-03-20 Andreas Stihl AG & Co. KG Appareil de travail portatif
WO2019067865A1 (fr) * 2017-09-28 2019-04-04 Walbro Llc Outil électrique comprenant un moteur à combustion léger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003061913A1 (fr) * 2002-01-18 2003-07-31 George Stephen Ramsay Poignees de declenchement pour outils electriques, appareils et armes a feu
EP1895555A2 (fr) * 2006-08-30 2008-03-05 Robert Bosch Gmbh Machine-outil manuelle
EP2460399A1 (fr) * 2010-12-02 2012-06-06 PELLENC (Société Anonyme) Outil aérien portatif, en particulier pour utilisation en arboriculture fruitière ou pour l'entretien d'espaces verts
EP3354892A1 (fr) * 2017-01-30 2018-08-01 Andreas Stihl AG & Co. KG Outil de travail portatif comprenant un moteur à combustion et un dispositif de démarrage électrique
EP3456949A1 (fr) * 2017-09-15 2019-03-20 Andreas Stihl AG & Co. KG Appareil de travail portatif
WO2019067865A1 (fr) * 2017-09-28 2019-04-04 Walbro Llc Outil électrique comprenant un moteur à combustion léger

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