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EP3356089B1 - Hand-held power tool having at least one machine-side contact element - Google Patents

Hand-held power tool having at least one machine-side contact element Download PDF

Info

Publication number
EP3356089B1
EP3356089B1 EP16766584.3A EP16766584A EP3356089B1 EP 3356089 B1 EP3356089 B1 EP 3356089B1 EP 16766584 A EP16766584 A EP 16766584A EP 3356089 B1 EP3356089 B1 EP 3356089B1
Authority
EP
European Patent Office
Prior art keywords
power tool
hand
accessory
held power
contact element
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
EP16766584.3A
Other languages
German (de)
French (fr)
Other versions
EP3356089A1 (en
Inventor
Joachim Schadow
Joern Stock
Florian Esenwein
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3356089A1 publication Critical patent/EP3356089A1/en
Application granted granted Critical
Publication of EP3356089B1 publication Critical patent/EP3356089B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/08—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving liquid or pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • 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
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle

Definitions

  • the invention relates to a handheld power tool with at least one contact element on the machine side.
  • Hand machine tools according to the preamble of the independent claim are already known from the prior art. Such a hand machine tool is in US 2014/231113 A1 disclosed.
  • the hand machine tool according to the invention with the features of the independent claim is designed in particular as an angle grinder.
  • an angle grinder In the case of handheld power tools of this type, there is a particular need to increase the safety for an operator of the handheld power tool. This includes monitoring whether safety-related accessories such as a protective hood or an additional handle are installed.
  • the hand power tool according to the invention has at least one gear housing part.
  • the transmission housing part is assigned to a housing of the handheld power tool.
  • the gear housing can be designed in one piece with the housing of the handheld power tool.
  • the housing of the handheld power tool can have further housing parts, such as a motor housing and a handle housing.
  • a security-relevant accessory has at least one accessory-side contact element. It is proposed that the machine-side contact element and the accessory-side contact element can be detachably connected to one another. It can thus advantageously be ensured that the safety-relevant accessories can be mounted on or on the handheld power tool.
  • the machine-side and the accessory-side contact element are assigned to a detection unit which is designed to detect a mechanical attachment of the accessory to the housing of the handheld power tool, in particular the gear housing part.
  • the detection unit can advantageously detect whether or not a safety-relevant accessory on the handheld power tool is in an assembled state. An assembled state is present in particular when the contact element on the machine side is connected to the contact element on the accessory side.
  • the machine-side contact element can be designed, for example, as a threaded bore for receiving an additional handle or as a bearing flange for receiving a protective hood.
  • the machine-side contact element can be designed in one piece with a sensor element of the detection unit.
  • the accessory-side contact element can be designed, for example, as a threaded pin of an additional handle or as a protective hood flange.
  • the accessory is designed as an additional handle.
  • the additional handle is advantageously provided to be gripped in particular by an operator of the handheld power tool.
  • the safety in the use of the handheld power tool can advantageously be increased by operating the handheld power tool with two hands.
  • the accessory is designed as a protective hood.
  • the protective hood is advantageously provided to protect an operator of the handheld power tool when the handheld power tool is in operation from sparks and / or material particles that arise when the handheld power tool is in operation and / or from fragments of a window that bursts during operation that are thrown out with great force.
  • the detection unit can have an electrical connection element.
  • the machine-side and / or the accessory-side contact element can be designed as an electrical connection element. If the accessory is attached to the handheld power tool, the machine-side electrical contact element and the accessory-side electrical contact element are advantageously connected to one another and close a circuit.
  • the machine-side contact element is designed as an electrical connection element, it can advantageously close a circuit with the accessory-side contact element made of electrically conductive material. It can thus advantageously be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.
  • the detection unit can advantageously have a capacitive proximity switch.
  • the detection unit can advantageously have a pressure sensor element, the pressure sensor element being designed to detect a contact pressure of the accessory on the housing.
  • the pressure sensor element can be designed, for example, as a strain gauge or as a piezo pressure sensor.
  • the pressure sensor element can be arranged in or on the housing of the handheld power tool in such a way that the accessory, in particular the accessory-side contact element, acts on the pressure sensor element directly or indirectly.
  • the accessories are advantageously connected to the housing of the handheld power tool in a form-fitting or non-positively and form-fitting manner.
  • the contact pressure is advantageously detected in an area in which the form fit is formed.
  • the detection unit can have a radar sensor element.
  • the radar sensor element is designed in particular to detect an approach of an object, advantageously an accessory. If the accessories are permanently fixed at the same distance from the radar sensor, the radar sensor element advantageously detects the installed accessories.
  • the radar sensor element is also advantageously designed to detect special shapes or patterns, so that the accessories can be clearly identified.
  • the detection unit has a magnetic field sensor.
  • the contact element on the machine side is designed as a magnetic field sensor and the contact element on the accessory side is designed as a magnet.
  • a magnetic circuit can thus advantageously be closed and it can be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.
  • the magnet is arranged in the threaded pin of the additional handle.
  • the hand-held power tool is advantageously equipped with an electromotive drive unit, in particular an electric motor, the electromotive drive unit being arranged in a motor housing part of the hand-held power tool.
  • the electromotive drive unit is provided in particular to drive a work spindle.
  • An electronics unit is arranged in the hand-held power tool and is advantageously provided to energize the electromotive drive unit.
  • the electronics unit advantageously only energizes the drive unit when the contact element on the machine side and the contact element on the accessory side are connected to one another in the mounted state of the accessory.
  • only one powered drive unit of the handheld power tool can be switched on or off by an operator by means of an operating switch. In this way, increased safety of an operator of the handheld power tool can advantageously be ensured.
  • At least one switching element when the accessories are installed, at least one switching element is actuated, and when the switching element is actuated, at least one piece of information about whether and / or that the accessory is installed is passed on to the electronics unit, in particular via at least one electrical conductor. It can thus advantageously be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.
  • the handheld power tool has at least one security element, the security element being able to communicate with the handheld power tool, the electronic unit and / or a mobile device.
  • FIG. 1 shows a handheld power tool 10.
  • the handheld power tool is an angle grinder, which usually has a gear housing part 12 that houses an angular gear. From the A work spindle 14, on which a grinding and / or cutting tool 16 is applied, protrudes from the angular gear.
  • the angle grinder has a motor housing part 18 for receiving an electromotive drive unit 20.
  • the transmission housing part 12 is, as in Figure 2 can be seen, two machine-side contact elements 24 are arranged. On the machine side, this means that the contact elements 24 are arranged in the handheld power tool 10. In the embodiment according to Figure 2 the contact elements 24 are arranged in the gear housing 12. However, it is also conceivable that the machine-side contact elements 24 are arranged in the motor housing part 18. It is also conceivable that more than two machine-side contact elements 24 are arranged in the handheld power tool 10.
  • An accessory 26 is provided to be connected to the handheld power tool 10.
  • the accessory 26 has a contact element 28 on the accessory side. On the accessory side, this means that the contact element 28 is arranged in the accessory 26 for the handheld power tool 10.
  • the accessory 26 is an additional handle 26a for the handheld power tool 10.
  • the additional handle has, as an accessory-side contact element 28, a threaded pin which is screwed into the gear housing 12.
  • the machine-side contact elements 24 and the accessory-side contact element 28 can be detachably connected to one another. In the assembled state of the additional handle 26a, the threaded pin 28 forms an electrical bridge between the two contact elements 24 on the machine side.
  • the accessory 26 for the hand machine tool 10 is, as in FIG Figure 3 shown, designed as an additional handle 26a or as a protective hood 26b.
  • the additional handle 26a is intended to be grasped by an operator of the handheld power tool, so that the handheld tractor 10 has to be operated with two hands.
  • the task of the protective hood 26b is to provide an operator of the handheld power tool 10 when the handheld power tool 10 is in operation To protect sparks and / or material particles that arise during operation of the hand-held power tool and / or from fragments of a pane that bursts during operation that are thrown outward with great force.
  • the machine-side contact elements 24 and the accessory-side contact element 28 are electrical contact elements. When connected, electrical contact elements close an electrical circuit.
  • the machine-side contact elements 24 have two electrical connections 30, each with a cable 32 for insulation, which are arranged in the transmission housing part 12.
  • the accessory-side contact element 28, which is a threaded pin 28, consists of an electrically conductive material, such as a metal. In the assembled state, the threaded pin 28 is connected to the two electrical connections 30.
  • the gear housing part 12 is made of an electrically conductive material, it must be ensured that no short circuit occurs between the contact elements 24, 28 and the gear housing part 12.
  • the contact elements 24, 28 are insulated from the transmission housing part 12.
  • the accessory-side contact element is a magnet 36, which is arranged on the threaded pin 28 of the additional handle 26a.
  • the machine-side contact element 24 is a magnetic field sensor 38.
  • the magnetic field sensor 38 detects whether the threaded pin 28 with the magnet 36 is connected to the transmission housing 12.
  • the electromotive drive unit 20 is designed as an electric motor which is provided to drive the work spindle 14.
  • An electronics unit 55 is arranged in the motor housing part 18 of the handheld power tool 10 and is provided to energize the electromotive drive unit 20.
  • the electronics unit 55 detects whether the electrical or magnetic circuit is closed, that is to say whether the accessory 26 is mounted on or on the handheld power tool.
  • Figure 1 shows two variants in which the assembly of the protective hood 26b is queried.
  • the protective hood 26b has a protective hood collar, not shown. If the protective hood 26b and thus the protective hood collar is mounted on the handheld power tool 10, a lever element 60 is moved.
  • the lever element 60 is designed as a bracket.
  • the lever element 60 actuates a first switching element 62.
  • the first switching element 62 is, for example, a microswitch or the like. When the first switching element 62 is actuated, the information that the protective hood 26b is mounted is passed on to the electronics unit 55 via two electrical conductors 64.
  • a pushing and pushing element 66 is guided out of the gear housing 12 of the handheld power tool 10.
  • the push and / or pressure element 66 is designed as a plunger and leads to the protective hood 26b. If the protective hood 26b is mounted on the handheld power tool 10, the plunger 66 is actuated.
  • the plunger 66 actuates a second switching element 68.
  • the second switching element 68 is, for example, a microswitch or the like. When the second switching element 68 is actuated, the information that the protective hood 26b is mounted is passed on to the electronics unit 55 via the electrical conductor 64.
  • the electronics unit 55 only energizes the drive unit 20 of the handheld power tool 10 if the contact elements are connected to one another in the mounted state of the accessory 26 on or on the handheld power tool 10.
  • FIG. 5 shows a further embodiment of the invention.
  • the handheld power tool 10 has a security element 70.
  • the security element 70 comprises elements such as switches, microswitches, sensor elements 72 and the like in order to identify a mounted accessory 26, such as an additional handle 26a and / or a protective hood 26b or the like.
  • the security element 70 also has an energy supply unit 74, a data evaluation unit 76, a storage unit 78, a communication unit 80 or the like.
  • the elements are connected to one another via at least one cable 82.
  • the security element 70 communicates with the electronics 55 via radio, for example via BT, BLE, NFC, WLAN or the like.
  • Contact elements can also be provided on the hand-held power tool, wherein communication can take place via the contact elements.
  • the contact elements can be attached to the protective hood, to the protective hood collar. However, it is also conceivable that the contact elements can be attached to the protective hood at a different location that appears sensible to a person skilled in the art.
  • the security element 70 can recognize and / or record parameters such as, for example, a temperature, a vibration or the like, and communicate them to the electronics unit 55.
  • the electronics unit 55 of the handheld power tool 10 evaluates the parameters and, if necessary, initiates one of the following actions: speed setting, power adjustment, additional cooling, a display of the parameters of the handheld power tool or the like.
  • the security element 70 can communicate with a mobile device 90.
  • the security element 70, the mobile device 90 and the handheld power tool 10 form a network.
  • the mobile device 90 is implemented, for example, as a smart phone, smart band or the like.
  • the mobile device can have access to the Internet or some other network.
  • the network is a place in which security settings are made, managed and controlled.
  • a handheld power tool 10 with an accessory 26 and with a detection unit 100 is shown.
  • the detection unit 100 comprises at least one magnetic field sensor 38 and at least one magnet 36.
  • the accessory 26 is available as a Additional handle 26a is formed which comprises a handle part 50 and a threaded pin 52.
  • the threaded pin 52 is designed as a contact element 28 on the accessory side.
  • the detection unit 100 has a magnet 36, which is arranged on the front side in the threaded pin 52 of the additional handle 26a (see FIG Figure 6a ).
  • the magnet 36 is arranged, for example, in the accessory-side contact element 28 such that a plane through the interface between the north pole and the south pole of the magnet 36 extends essentially parallel to the longitudinal extension 54 of the auxiliary handle.
  • FIG. 6b A top view for the arrangement of the magnet 36 according to Figure 6a is in Figure 6b shown.
  • the plane through the interface between the north pole and the south pole of the magnet 36 extends essentially perpendicular to the longitudinal extent 54 of the additional handle 26a, as in FIG Figure 6c shown as an example.
  • the magnet 36 is arranged around the accessory-side contact element 28, in particular around the threaded pin 52, as in FIG Figures 6d-f shown.
  • the magnet 36 is advantageously designed in the form of a ring.
  • the magnet 36 rests on the handle part 50.
  • different orientations of the magnet 36 are conceivable, which are shown in FIG Figure 6e and f are shown.
  • a magnetic field sensor 38 assigned to a detection unit 100 can be designed, for example, as a Hall sensor or a Rheed switch.
  • the handheld power tool 10 has two opposing threaded bores 13 on the gear housing part 12, which are designed as a contact element 24 on the machine side.
  • the magnetic field sensor 38 is arranged at the end of the threaded hole 13.
  • the arrangement of the magnetic field sensor in the interior of the gear housing part 12 advantageously protects the magnetic field sensor from damage.
  • the magnetic field sensor 38 is arranged around the threaded hole 13, as in FIG Fig. 6g shown.
  • the arrangement of the magnet 36 and magnetic field sensor 38 of the detection unit 100 are advantageously coordinated.
  • the arrangement of the magnet 36 corresponds to Figure 6a on the arrangement of the magnetic field sensor 38 Fig. 6g and the arrangement of the magnet 36 Fig. 6d to the arrangements of the magnetic field sensor 38 Fig. 6h .
  • an accessory which is designed as a protective hood 26b.
  • the protective hood 26b has a protective cover flange 60 which is designed such that it can be detachably connected to the gearbox housing part 12 of the handheld power tool 10.
  • the protective hood flange 60 is designed as an accessory-side contact element 28.
  • the protective hood 26b has a magnet 36 which is arranged in a semicircle around the protective hood flange 60 (see FIG Figure 6i ).
  • other arrangements of the magnet 36 such as distributed on the protective hood 26b (see FIG Fig. 6f ) or symmetrically around the protective hood flange 60 (see Fig. 6k ) arranged.
  • the hand-held power tool 10 can have a magnetic field sensor 38, which is arranged on the output side 15 of the housing 11 of the hand-held power tool 10, in particular the gear housing part 12 (see FIG Figure 6I ).
  • the output side 15 is in particular the side of the handheld power tool 10 on which the work spindle 14 emerges from the housing 11 of the handheld power tool 10 to the outside.
  • the detection unit 100 is designed in particular to detect a connection between the machine-side contact element 24 and the accessory-side contact element 28.
  • the magnetic field sensor 38 and the magnet 36 are advantageously arranged in such a way that a connection is only detected as soon as the accessory 26 is completely mounted on the housing 11 of the handheld power tool 10.
  • the detection unit 100 detects the position of the magnet 36 via the magnetic field sensor 38. If the position of the magnet 36 corresponds to a properly installed state of the accessory 26, the drive unit 20 is advantageously designed to be energized via the electronics unit 55.
  • the detection unit 100 comprises a capacitive proximity switch 110, which is used for this is designed to detect materials that influence the electrical field of the capacitive proximity switch 110.
  • the capacitive proximity switch 110 in Fig. 7 comprises, for example, a coil 112 which is designed as part of an electromagnetic resonant circuit.
  • the coil 112 is arranged around the machine-side contact element 24, which is designed as a threaded hole 13, for example.
  • the accessory 26 is designed, for example, as an additional handle 26a and comprises an accessory-side contact element 28, which is designed as a threaded pin 52.
  • the accessory-side contact element 28 is formed, for example, from a magnetoresistive material.
  • the resonant circuit advantageously oscillates at its resonance frequency. If the accessory-side contact element 28 at least partially penetrates the opening formed by the coil 112, the resonant oscillation of the resonant circuit is influenced, in particular damped.
  • the detection unit 100 is designed in particular to detect this attenuation.
  • the detection unit 100 comprises in particular at least one pressure sensor element 120 which is designed to detect the contact pressure of the accessory 26 on the housing 11 of the handheld power tool 10.
  • the pressure sensor element 120 is designed, for example, as a piezo pressure sensor element and is arranged on the outer surface of the housing 11 of the hand-held power tool 10, in particular on the outer surface of the transmission housing part 12.
  • the pressure sensor element 120 is advantageously arranged in such a way that, in the assembled state, the grip part 50 of the auxiliary handle 26a acts on the pressure sensor element 120 directly and thereby causes a contact pressure on the pressure sensor element 120.
  • FIG 8b An alternative arrangement of the pressure sensor element 120 is shown.
  • the pressure sensor element 120 is arranged, for example, in a bearing flange 17 of the transmission housing part 11.
  • the accessory-side contact element 28 in the form of a protective hood flange 60 acts on the pressure sensor element 120.
  • the attachment of a protective hood 26b can advantageously be detected by this arrangement.
  • FIG 8c An alternative embodiment of the pressure sensor element 120 is shown.
  • the pressure sensor element 120 is, for example, circular along an outer surface of the bearing flange 17 of the gear housing part 12 is arranged.
  • the pressure sensor element 120 is designed in particular as a touch-sensitive surface 122.
  • the touch-sensitive surface 122 is designed as part of a capacitor unit.
  • the accessory 26 acts on the touch-sensitive surface in such a way that a deformation, in particular a bending of a few ⁇ m, of the touch-sensitive surface 122 is brought about.
  • the deformation of the touch-sensitive surface 122 has a direct influence on the capacitance of the capacitor unit.
  • a fastening of the accessories to the housing 11 of the handheld power tool 10 can advantageously be detected via the change in the capacitance of the capacitor unit.
  • the pressure sensor element 120 in particular the touch-sensitive surface 122, to be arranged at the end of a threaded hole 13 of the handheld power tool 10.
  • the detection unit 100 comprises an air pressure sensor element 130, which is designed to determine the air pressure.
  • the machine-side contact element 24 is designed as a threaded bore 13 of the gear housing part 12 and the accessory-side contact element 28 is designed as a threaded pin 52 of an additional handle 26a.
  • the air pressure sensor element 130 is arranged in a space spanned by the threaded bore 13. In particular, the air pressure sensor element 130 is arranged at an end of the threaded bore 13 opposite an inlet opening 56 of the threaded bore 13.
  • the threaded pin 52 of the auxiliary handle 26a is received in the gear housing part 12 via the inlet opening 56 of the threaded bore 13.
  • the additional handle 26a is screwed to the housing 11 of the hand-held power tool 10, as a result of which the space spanned by the threaded bore 13 is essentially airtight.
  • the detection unit 100 in particular the air pressure sensor element 130 of the detection unit, is advantageously designed to detect the pressure increase.
  • the space spanned by the threaded bore 13 of the housing 11 of the handheld power tool 10 has a further through opening 58 in addition to the inlet opening 56.
  • the through opening 58 is arranged, for example, at the end of the space spanned by the threaded bore 13 opposite the inlet opening 56.
  • the handheld power tool 10 has a fan (not shown) which is designed to cool the drive unit 20 of the handheld power tool 10.
  • the through-opening 58 is advantageously arranged in the housing 11 of the hand-held power tool 10 in such a way that cooling air is drawn in via the inlet opening 56 of the threaded bore 13, through the through-opening 58 of the threaded bore 13, in the direction of the fan.
  • the threaded pin 52 of the additional handle 26a is arranged in the inlet opening 56 of the threaded bore 13 and thereby closes it.
  • the interruption has the consequence that the cooling air flow 59 is interrupted and a negative pressure develops inside the housing.
  • the air pressure sensor element 130 which is designed to detect the change in the air pressure, is arranged in the interior of the housing 11.
  • the air pressure sensor element 130 is arranged, for example, above the through opening 58 of the threaded bore 13.
  • the cooling air flow is passed through the housing 11 of the handheld power tool 10 in such a way that it exits the housing via the inlet opening 56 of the threaded bore 13. In this case, closing the inlet opening 56 results in an overpressure which can also be detected by the air pressure sensor element 130.
  • the bearing flange of the transmission housing part can have a through opening, the air pressure sensor element being arranged along the flow direction between the through opening and the fan.
  • the passage opening in the bearing flange is advantageously covered by the protective hood flange in such a way that the cooling air flow through the The passage opening is interrupted and, depending on the direction of flow, an overpressure or underpressure arises which can be detected by the air pressure sensor element.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Power Tools In General (AREA)

Description

Die Erfindung betrifft eine Handwerkzeugmaschine mit mindestens einem maschinenseitigem Kontaktelement.The invention relates to a handheld power tool with at least one contact element on the machine side.

Stand der TechnikState of the art

Aus dem Stand der Technik sind schon Handwerkzeugmaschinen nach dem Oberbegriff des unabhängigen Anspruchs bekannt. Eine solche Handwerkzeugmaschine ist in US 2014/231113 A1 offenbart.Hand machine tools according to the preamble of the independent claim are already known from the prior art. Such a hand machine tool is in US 2014/231113 A1 disclosed.

Offenbarung der ErfindungDisclosure of the invention

Die erfindungsgemäße Handwerkzeugmaschine mit den Merkmalen des unabhängigen Anspruchs ist insbesondere als Winkelschleifer ausgebildet. Bei Handwerkzeugmaschinen dieser Art ist es ein besonderes Bedürfnis, die Sicherheit für einen Bediener der Handwerkzeugmaschine zu erhöhen. Dazu gehört unter anderem eine Überwachung, ob sicherheitsrelevantes Zubehör wie eine Schutzhaube beziehungsweise ein Zusatzhandgriff montiert sind.The hand machine tool according to the invention with the features of the independent claim is designed in particular as an angle grinder. In the case of handheld power tools of this type, there is a particular need to increase the safety for an operator of the handheld power tool. This includes monitoring whether safety-related accessories such as a protective hood or an additional handle are installed.

Die erfindungsgemäße Handwerkzeugmaschine weist mindestens ein Getriebegehäuseteil auf. Das Getriebegehäuseteil ist einem Gehäuse der Handwerkzeugmaschine zugeordnet. Das Getriebegehäuse kann einstückig mit dem Gehäuse der Handwerkzeugmaschine ausgebildet sein. Das Gehäuse der Handwerkzeugmaschine kann neben dem Getriebegehäuseteil weitere Gehäuseteile, wie beispielsweise einem Motorgehäuse und einem Handgriffgehäuse. Ein sicherheitsrelevantes Zubehör weist erfindungsgemäß mindestens ein zubehörseitiges Kontaktelement auf. Es wird vorgeschlagen, dass das maschinenseitige Kontaktelement und das zubehörseitige Kontaktelement lösbar miteinander verbindbar sind. Somit kann vorteilhaft sichergestellt werden, dass das sicherheitsrelevante Zubehör auf beziehungsweise an die Handwerkzeugmaschine montiert werden kann.The hand power tool according to the invention has at least one gear housing part. The transmission housing part is assigned to a housing of the handheld power tool. The gear housing can be designed in one piece with the housing of the handheld power tool. In addition to the gear housing part, the housing of the handheld power tool can have further housing parts, such as a motor housing and a handle housing. According to the invention, a security-relevant accessory has at least one accessory-side contact element. It is proposed that the machine-side contact element and the accessory-side contact element can be detachably connected to one another. It can thus advantageously be ensured that the safety-relevant accessories can be mounted on or on the handheld power tool.

Erfindungsgemäß sind das maschinenseitige und das zubehörseitige Kontaktelement einer Detektionseinheit zugeordnet, die dazu ausgebildet ist, eine mechanische Befestigung des Zubehörs mit dem Gehäuse der Handwerkzeugmaschine, insbesondere dem Getriebegehäuseteil, zu detektieren. Vorteilhaft kann durch die Detektionseinheit erkannt werden, ob ein sicherheitsrelevantes Zubehör an der Handwerkzeugmaschine in einem montierten Zustand ist oder nicht. Ein montierter Zustand liegt insbesondere dann vor, wenn das maschinenseitige Kontaktelement mit dem zubehörseitigen Kontaktelement verbunden ist. Das maschinenseitige Kontaktelement kann beispielhaft als eine Gewindebohrung zur Aufnahme eines Zusatzhandgriffs oder als ein Lagerflansch zur Aufnahme einer Schutzhaube ausgebildet sein. Das maschinenseitige Kontaktelement kann einstückig mit einem Sensorelement der Detektionseinheit ausgebildet sein. Das zubehörseitige Kontaktelement kann beispielhaft als Gewindezapfen eines Zusatzhandgriffs oder als ein Schutzhaubenflansch ausgebildet sein.According to the invention, the machine-side and the accessory-side contact element are assigned to a detection unit which is designed to detect a mechanical attachment of the accessory to the housing of the handheld power tool, in particular the gear housing part. The detection unit can advantageously detect whether or not a safety-relevant accessory on the handheld power tool is in an assembled state. An assembled state is present in particular when the contact element on the machine side is connected to the contact element on the accessory side. The machine-side contact element can be designed, for example, as a threaded bore for receiving an additional handle or as a bearing flange for receiving a protective hood. The machine-side contact element can be designed in one piece with a sensor element of the detection unit. The accessory-side contact element can be designed, for example, as a threaded pin of an additional handle or as a protective hood flange.

Erfindungsgemäß ist das Zubehör als Zusatzhandgriff ausgebildet. Der Zusatzhandgriff ist vorteilhafterweise dazu vorgesehen, insbesondere von einem Bediener der Handwerkzeugmaschine umgriffen zu werden. Somit kann vorteilhaft die Sicherheit in der Anwendung der Handwerkzeugmaschine dadurch erhöht werden, indem die Handwerkzeugmaschine mit zwei Händen bedient wird. In einer weiteren vorteilhaften Ausführungsform ist das Zubehör als Schutzhaube ausgebildet. Die Schutzhaube ist vorteilhafterweise dazu vorgesehen, einen Bediener der Handwerkzeugmaschine im Betrieb der Handwerkzeugmaschine vor Funken und/oder Materialpartikeln, die im Betrieb der Handwerkzeugmaschine entstehen, und/oder vor mit großer Wucht nach außen geschleuderten Bruchstücken einer im Betrieb zerborstenen Scheibe zu schützen.According to the invention, the accessory is designed as an additional handle. The additional handle is advantageously provided to be gripped in particular by an operator of the handheld power tool. Thus, the safety in the use of the handheld power tool can advantageously be increased by operating the handheld power tool with two hands. In a further advantageous embodiment, the accessory is designed as a protective hood. The protective hood is advantageously provided to protect an operator of the handheld power tool when the handheld power tool is in operation from sparks and / or material particles that arise when the handheld power tool is in operation and / or from fragments of a window that bursts during operation that are thrown out with great force.

Die Detektionseinheit kann ein elektrisches Anschlusselement aufweisen. Insbesondere kann das maschinenseitige und/oder das zubehörseitige Kontaktelement als ein elektrisches Anschlusselement ausgebildet sein. Ist das Zubehör an der Handwerkzeugmaschine befestigt, sind das maschinenseitige elektrische Kontaktelement und das zubehörseitige elektrische Kontaktelement vorteilhaft miteinander verbunden und schließen einen Stromkreis.The detection unit can have an electrical connection element. In particular, the machine-side and / or the accessory-side contact element can be designed as an electrical connection element. If the accessory is attached to the handheld power tool, the machine-side electrical contact element and the accessory-side electrical contact element are advantageously connected to one another and close a circuit.

Ist das maschinenseitige Kontaktelement als ein elektrisches Anschlusselement ausgeführt, kann es vorteilhaft mit dem zubehörseitigen Kontaktelement aus elektrisch leitfähigem Material einen Stromkreis schließen. Somit kann vorteilhaft detektiert werden, ob das sicherheitsrelevante Zubehör an oder auf der Handwerkzeugmaschine montiert ist.If the machine-side contact element is designed as an electrical connection element, it can advantageously close a circuit with the accessory-side contact element made of electrically conductive material. It can thus advantageously be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.

Die Detektionseinheit kann vorteilhaft einen kapazitiven Näherungsschalter aufweisen.The detection unit can advantageously have a capacitive proximity switch.

Die Detektionseinheit kann vorteilhaft ein Drucksensorelement aufweisen, wobei das Drucksensorelement dazu ausgebildet ist, einen Anpressdruck des Zubehörs auf das Gehäuse zu detektieren. Das Drucksensorelement kann beispielsweise als Dehnungsmessstreifen oder als ein Piezo-Drucksensor ausgebildet sein. Das Drucksensorelement kann derart in oder an dem Gehäuse der Handwerkzeugmaschine angeordnet sein, dass das Zubehör, insbesondere das zubehörseitige Kontaktelement, das Drucksensorelement mittelbar oder unmittelbar beaufschlagt. Das Zubehör wird vorteilhaft formschlüssig oder kraft- und formschlüssig mit dem Gehäuse der Handwerkzeugmaschine verbunden. Vorteilhaft wird der Anpressdruck in einem Bereich, in dem der Formschluss gebildet wird, detektiert.The detection unit can advantageously have a pressure sensor element, the pressure sensor element being designed to detect a contact pressure of the accessory on the housing. The pressure sensor element can be designed, for example, as a strain gauge or as a piezo pressure sensor. The pressure sensor element can be arranged in or on the housing of the handheld power tool in such a way that the accessory, in particular the accessory-side contact element, acts on the pressure sensor element directly or indirectly. The accessories are advantageously connected to the housing of the handheld power tool in a form-fitting or non-positively and form-fitting manner. The contact pressure is advantageously detected in an area in which the form fit is formed.

Die Detektionseinheit kann ein Radarsensorelement aufweisen. Das Radarsensorelement ist insbesondere dazu ausgebildet, eine Annäherung eines Objekts, vorteilhaft eines Zubehörs, zu detektieren. Ist das Zubehör dauerhaft in derselben Entfernung zum Radarsensor fixiert, so erkennt das Radarsensorelement vorteilhaft das montierte Zubehör. Vorteilhaft ist das Radarsensorelement ebenfalls dazu ausgebildet, spezielle Formen oder Muster zu detektieren, wodurch das Zubehör eindeutig identifizierbar ist.The detection unit can have a radar sensor element. The radar sensor element is designed in particular to detect an approach of an object, advantageously an accessory. If the accessories are permanently fixed at the same distance from the radar sensor, the radar sensor element advantageously detects the installed accessories. The radar sensor element is also advantageously designed to detect special shapes or patterns, so that the accessories can be clearly identified.

Die Detektionseinheit weist einen Magnetfeldsensor auf.The detection unit has a magnetic field sensor.

Erfindungsgemäß ist das maschinenseitige Kontaktelement als ein Magnetfeldsensor ausgeführt und das zubehörseitige Kontaktelement als ein Magnet. Somit kann vorteilhaft ein Magnetkreis geschlossen und detektiert werden, ob das sicherheitsrelevante Zubehör an oder auf der Handwerkzeugmaschine montiert ist.According to the invention, the contact element on the machine side is designed as a magnetic field sensor and the contact element on the accessory side is designed as a magnet. A magnetic circuit can thus advantageously be closed and it can be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.

Der Magnet ist im Gewindezapfen des Zusatzhandgriffs angeordnet.The magnet is arranged in the threaded pin of the additional handle.

Vorteilhafterweise ist die Handwerkzeugmaschine mit einer elektromotorischen Antriebseinheit ausgestattet, insbesondere einem Elektromotor, wobei die elektromotorische Antriebseinheit in einem Motorgehäuseteil der Handwerkzeugmaschine angeordnet ist. Die elektromotorische Antriebseinheit ist insbesondere dazu vorgesehen, eine Arbeitsspindel anzutreiben.The hand-held power tool is advantageously equipped with an electromotive drive unit, in particular an electric motor, the electromotive drive unit being arranged in a motor housing part of the hand-held power tool. The electromotive drive unit is provided in particular to drive a work spindle.

Eine Elektronikeinheit ist in der Handwerkzeugmaschine angeordnet und vorteilhafterweise dazu vorgesehen, die elektromotorische Antriebseinheit zu bestromen.An electronics unit is arranged in the hand-held power tool and is advantageously provided to energize the electromotive drive unit.

Vorteilhafterweise bestromt die Elektronikeinheit die Antriebseinheit erst dann, wenn das maschinenseitige Kontaktelement und das zubehörseitige Kontaktelement im montierten Zustand des Zubehörs miteinander verbunden sind. Vorteilhaft kann nur eine bestromte Antriebseinheit der Handwerkzeugmaschine von einem Bediener mittels eines Betriebsschalters an- oder ausgeschaltet werden. Somit kann vorteilhaft eine erhöhte Sicherheit eines Bedieners der Handwerkzeugmaschine gewährleistet werden.The electronics unit advantageously only energizes the drive unit when the contact element on the machine side and the contact element on the accessory side are connected to one another in the mounted state of the accessory. Advantageously, only one powered drive unit of the handheld power tool can be switched on or off by an operator by means of an operating switch. In this way, increased safety of an operator of the handheld power tool can advantageously be ensured.

Vorteilhafterweise wird bei montierten Zubehör mindestens ein Schaltelement betätigt, wobei bei Betätigen des Schaltelements mindestens eine Information darüber, ob und/oder dass das Zubehör montiert ist, insbesondere über mindestens einen elektrischen Leiter an die Elektronikeinheit weiter geleitet wird. Somit kann vorteilhaft detektiert werden, ob das sicherheitsrelevante Zubehör an oder auf der Handwerkzeugmaschine montiert ist.Advantageously, when the accessories are installed, at least one switching element is actuated, and when the switching element is actuated, at least one piece of information about whether and / or that the accessory is installed is passed on to the electronics unit, in particular via at least one electrical conductor. It can thus advantageously be detected whether the safety-relevant accessories are mounted on or on the handheld power tool.

In einer weiteren vorteilhaften Ausführungsform weist die Handwerkzeugmaschine mindestens ein Sicherheitselement auf, wobei das Sicherheitselement mit der Handwerkzeugmaschine, der Elektronikeinheit und/oder einem mobilen Gerät kommunizieren kann.In a further advantageous embodiment, the handheld power tool has at least one security element, the security element being able to communicate with the handheld power tool, the electronic unit and / or a mobile device.

Weitere Vorteile und zweckmäßige Ausführungen sind der Figurenbeschreibung und den Zeichnungen zu entnehmen.Further advantages and useful designs can be found in the description of the figures and the drawings.

Zeichnungendrawings

In den Zeichnungen sind Ausführungsformen einer erfindungsgemäßen Handwerkzeugmaschine gezeigt.In the drawings, embodiments of a handheld power tool according to the invention are shown.

Es zeigen:

Figur 1
eine Anordnung einer erfindungsgemäßen Handwerkzeugmaschine und eines Kontaktelements in schematischer Darstellung,
Figur 2
ein erster Ausschnitt einer Handwerkzugmaschine und ein erster Ausschnitt eines dazugehörigen Zubehörs in schematischer Darstellung,
Figur 3
zwei Ausführungsform eines Zubehörs der erfindungsgemäßen Handwerkzeugmaschine in schematischer Darstellung,
Figur 4
ein zweiter Ausschnitt einer Handwerkzugmaschine und ein zweiter Ausschnitt eines dazugehörigen Zubehörs in schematischer Darstellung,
Figur 5
eine zweite Ausführungsform einer erfindungsgemäßen Handwerkzeugmaschine in schematischer Darstellung,
Figur 6a
eine perspektivische Ansicht einer weiteren Ausführungsform eines Zubehörs,
Figur 6b
eine Draufsicht des Zubehörs nach Fig. 6a,
Figur 6c
eine alternative Ausführungsform des Zubehörs nach Fig. 6a,
Figur 6d
eine weitere alternative Ausführungsform des Zubehörs nach Fig. 6a-c,
Figur 6e
eine Draufsicht des Zubehörs nach Fig. 6d,
Figur 6f
eine Draufsicht auf weitere alternative Ausführungsform des Zubehörs nach Fig. 6a-e,
Figur 6g
ein Ausschnitt einer Handwerkzeugmaschine mit einer Detektionseinheit,
Figur 6h
ein Ausschnitt einer Handwerkzeugmaschine mit einer Detektionseinheit mit einer zu Fig. 6g unterschiedlichen Anordnung der Detektionseinheit,
Figur 6i
eine perspektivische Ansicht einer weiteren Ausführungsform einer Schutzhaube,
Figur 6j
eine perspektivische Ansicht einer alternativen Ausführungsform der Schutzhaube nach Fig. 6i,
Figur 6k
eine perspektivische Ansicht einer weiteren alternativen Ausführungsform der Schutzhaube nach Fig. 6i-j,
Figur 6l
ein Ausschnitt einer weiteren Ausführungsform einer Handwerkzeugmaschine,
Figur 7
ein Ausschnitt einer weiteren alternativen Ausführungsform einer Handwerkzugmaschine und ein Ausschnitt einer weiteren alternativen Ausführungsform eines dazugehörigen Zubehörs in schematischer Darstellung,
Figur 8a
ein Ausschnitt einer Ausführungsform einer Handwerkzugmaschine mit einer Detektionseinheit, die ein Drucksensorelement umfasst, und ein Ausschnitt einer Ausführungsform eines dazugehörigen Zubehörs in schematischer Darstellung,
Figur 8b
ein Ausschnitt einer alternativen Ausführungsform einer Handwerkzugmaschine nach Fig. 8a in schematischer Darstellung,
Figur 8c
ein Ausschnitt einer weiteren alternativen Ausführungsform einer Handwerkzugmaschine nach Fig. 8a in schematischer Darstellung,
Figur 9a
ein Ausschnitt einer Ausführungsform einer Handwerkzugmaschine mit einer Detektionseinheit, die ein Luftdrucksensorelement umfasst, und ein Ausschnitt einer Ausführungsform eines dazugehörigen Zubehörs in schematischer Darstellung,
Figur 9b
ein Ausschnitt einer alternativen Ausführungsform einer Handwerkzugmaschine und eines Zubehörs nach Fig. 9a in schematischer Darstellung.
Show it:
Figure 1
an arrangement of a hand machine tool according to the invention and a contact element in a schematic representation,
Figure 2
a first section of a handicraft tractor and a first section of an associated accessory in a schematic representation,
Figure 3
two embodiment of an accessory of the hand power tool according to the invention in a schematic representation,
Figure 4
a second section of a handicraft tractor and a second section of the associated accessories in a schematic representation,
Figure 5
a second embodiment of a hand power tool according to the invention in a schematic representation,
Figure 6a
a perspective view of a further embodiment of an accessory,
Figure 6b
a top view of the accessories according to Figure 6a ,
Figure 6c
an alternative embodiment of the accessories according to Figure 6a ,
Figure 6d
another alternative embodiment of the accessories according to Figures 6a-c ,
Figure 6e
a top view of the accessories according to Fig. 6d ,
Figure 6f
a plan view of another alternative embodiment of the accessories according to Figures 6a-e ,
Figure 6g
a section of a hand machine tool with a detection unit,
Figure 6h
a section of a hand machine tool with a detection unit with a to Fig. 6g different arrangement of the detection unit,
Figure 6i
a perspective view of a further embodiment of a protective hood,
Figure 6j
a perspective view of an alternative embodiment of the protective hood according to Figure 6i ,
Figure 6k
a perspective view of a further alternative embodiment of the protective hood according to Figures 6i-j ,
Figure 6l
a section of a further embodiment of a handheld power tool,
Figure 7
a section of a further alternative embodiment of a handicraft tractor and a section of a further alternative embodiment of an associated accessory in a schematic representation,
Figure 8a
a section of an embodiment of a handicraft tractor with a detection unit, which comprises a pressure sensor element, and a section of an embodiment of an associated accessory in a schematic representation,
Figure 8b
a section of an alternative embodiment of a handcraft tractor Figure 8a in a schematic representation,
Figure 8c
a section of a further alternative embodiment of a handcraft tractor Figure 8a in a schematic representation,
Figure 9a
a section of an embodiment of a handicraft tractor with a detection unit, which comprises an air pressure sensor element, and a section of an embodiment of an associated accessory in a schematic representation,
Figure 9b
a section of an alternative embodiment of a handcraft tractor and an accessory according to Figure 9a in a schematic representation.

Beschreibungdescription

Für die in den unterschiedlichen Ausführungsformen vorkommenden gleichen Bauteile werden dieselben Bezugszahlen verwendet.The same reference numbers are used for the same components occurring in the different embodiments.

Figur 1 zeigt eine Handwerkzeugmaschine 10. Bei der Handwerkzeugmaschine handelt es sich um einen Winkelschleifer, der üblicherweise ein Getriebegehäuseteil 12 aufweist, dass ein Winkelgetriebe beherbergt. Aus dem Winkelgetriebe ragt eine Arbeitsspindel 14, auf der ein Schleif- und/oder Trennwerkzeug 16 aufgebracht ist. Der Winkelschleifer weist ein Motorgehäuseteil 18 zur Aufnahme einer elektromotorischen Antriebseinheit 20 auf. Figure 1 shows a handheld power tool 10. The handheld power tool is an angle grinder, which usually has a gear housing part 12 that houses an angular gear. From the A work spindle 14, on which a grinding and / or cutting tool 16 is applied, protrudes from the angular gear. The angle grinder has a motor housing part 18 for receiving an electromotive drive unit 20.

Im Getriebegehäuseteil 12 ist, wie in Figur 2 ersichtlich, zwei maschinenseitige Kontaktelemente 24 angeordnet. Maschinenseitig bedeutet, dass die Kontaktelemente 24 in der Handwerkzeugmaschine 10 angeordnet sind. Im Ausführungsbeispiel nach Figur 2 sind die Kontaktelemente 24 im Getriebegehäuse 12 angeordnet. Es ist aber auch denkbar, dass die maschinenseitigen Kontaktelemente 24 im Motorgehäuseteil 18 angeordnet sind. Es ist auch denkbar, dass mehr als zwei maschinenseitige Kontaktelemente 24 in der Handwerkzeugmaschine 10 angeordnet sind.In the transmission housing part 12 is, as in Figure 2 can be seen, two machine-side contact elements 24 are arranged. On the machine side, this means that the contact elements 24 are arranged in the handheld power tool 10. In the embodiment according to Figure 2 the contact elements 24 are arranged in the gear housing 12. However, it is also conceivable that the machine-side contact elements 24 are arranged in the motor housing part 18. It is also conceivable that more than two machine-side contact elements 24 are arranged in the handheld power tool 10.

Ein Zubehör 26 ist dazu vorgesehen, mit der Handwerkzeugmaschine 10 verbunden zu werden. Das Zubehör 26 weist ein zubehörseitiges Kontaktelement 28 auf. Zubehörseitig bedeutet, dass das Kontaktelement 28 im Zubehör 26 für die Handwerkzeugmaschine 10 angeordnet ist. Im Ausführungsbeispiel nach Figur 2 ist das Zubehör 26 ein Zusatzhandgriff 26a für die Handwerkzeugmaschine 10. Der Zusatzhandgriff weist als zubehörseitiges Kontaktelement 28 einen Gewindezapfen auf, welcher in das Getriebegehäuse 12 geschraubt wird. In der erfindungsgemäßen Ausführungsform sind die maschinenseitigen Kontaktelemente 24 und das zubehörseitige Kontaktelement 28 lösbar miteinander verbindbar. Der Gewindezapfen 28 bildet im montierten Zustand des Zusatzhandgriffes 26a eine elektrische Brücke zwischen den beiden maschinenzeitigen Kontaktelementen 24.An accessory 26 is provided to be connected to the handheld power tool 10. The accessory 26 has a contact element 28 on the accessory side. On the accessory side, this means that the contact element 28 is arranged in the accessory 26 for the handheld power tool 10. In the embodiment according to Figure 2 the accessory 26 is an additional handle 26a for the handheld power tool 10. The additional handle has, as an accessory-side contact element 28, a threaded pin which is screwed into the gear housing 12. In the embodiment according to the invention, the machine-side contact elements 24 and the accessory-side contact element 28 can be detachably connected to one another. In the assembled state of the additional handle 26a, the threaded pin 28 forms an electrical bridge between the two contact elements 24 on the machine side.

Das Zubehör 26 für die Handwerkzeugmaschine 10 ist, wie in Figur 3 dargestellt, als Zusatzhandgriff 26a oder als Schutzhaube 26b ausgeführt. Der Zusatzhandgriff 26a ist dazu vorgesehen, von einem Bediener der Handwerkzeugmaschine umgriffen zu werden, sodass die Handwerkzugmaschine 10 mit zwei Händen bedient werden muss.The accessory 26 for the hand machine tool 10 is, as in FIG Figure 3 shown, designed as an additional handle 26a or as a protective hood 26b. The additional handle 26a is intended to be grasped by an operator of the handheld power tool, so that the handheld tractor 10 has to be operated with two hands.

Die Aufgabe der Schutzhaube 26b ist es, einen Bediener der Handwerkzeugmaschine 10 im Betrieb der Handwerkzeugmaschine 10 vor Funken und/oder Materialpartikeln, die im Betrieb der Handwerkzeugmaschine entstehen, und/oder vor mit großer Wucht nach außen geschleuderten Bruchstücken einer im Betrieb zerborstenen Scheibe zu schützen.The task of the protective hood 26b is to provide an operator of the handheld power tool 10 when the handheld power tool 10 is in operation To protect sparks and / or material particles that arise during operation of the hand-held power tool and / or from fragments of a pane that bursts during operation that are thrown outward with great force.

Die maschinenseitigen Kontaktelemente 24 und das zubehörseitige Kontaktelement 28 sind elektrische Kontaktelemente. Elektrische Kontaktelemente schließen bei Verbundenheit einen elektrischen Stromkreis.The machine-side contact elements 24 and the accessory-side contact element 28 are electrical contact elements. When connected, electrical contact elements close an electrical circuit.

So sind im Ausführungsbeispiel in Figur 2 die maschinenseitigen Kontaktelemente 24 zwei elektrische Anschlüsse 30 mit je einem Kabel 32 zur Isolation, die im Getriebegehäuseteil 12 angeordnet sind. Das zubehörseitige Kontaktelement 28, der ein Gewindezapfen 28 besteht aus einem elektrisch leitenden Werkstoff, wie zum Beispiel aus einem Metall. Im montierten Zustand ist der Gewindezapfen 28 mit den zwei elektrischen Anschlüssen 30 verbunden.In the exemplary embodiment in Figure 2 the machine-side contact elements 24 have two electrical connections 30, each with a cable 32 for insulation, which are arranged in the transmission housing part 12. The accessory-side contact element 28, which is a threaded pin 28, consists of an electrically conductive material, such as a metal. In the assembled state, the threaded pin 28 is connected to the two electrical connections 30.

Ist das Getriebegehäuseteil 12 aus einem elektrisch leitenden Werkstoff ausgeführt, muss sichergestellt werden, dass kein Kurzschluss zwischen den Kontaktelementen 24, 28 und dem Getriebegehäuseteil 12 auftritt. Hierzu sind die Kontaktelemente 24, 28 gegenüber dem Getriebegehäuseteil 12 isoliert.If the gear housing part 12 is made of an electrically conductive material, it must be ensured that no short circuit occurs between the contact elements 24, 28 and the gear housing part 12. For this purpose, the contact elements 24, 28 are insulated from the transmission housing part 12.

In einer weiteren Ausführungsform nach Figur 4 ist das zubehörseitige Kontaktelement ein Magnet 36, der am Gewindezapfen 28 des Zusatzhandgriffs 26a angeordnet ist. Das maschinenseitige Kontaktelement 24 ist ein Magnetfeldsensor 38. Der Magnetfeldsensor 38 erkennt, ob der Gewindezapfen 28 mit dem Magneten 36 mit dem Getriebegehäuse 12 verbunden wird.In a further embodiment according to Figure 4 the accessory-side contact element is a magnet 36, which is arranged on the threaded pin 28 of the additional handle 26a. The machine-side contact element 24 is a magnetic field sensor 38. The magnetic field sensor 38 detects whether the threaded pin 28 with the magnet 36 is connected to the transmission housing 12.

Wie Figur 1 zeigt, ist die elektromotorische Antriebseinheit 20 als Elektromotor ausgebildet, der dazu vorgesehen ist, die Arbeitsspindel 14 anzutreiben.As Figure 1 shows, the electromotive drive unit 20 is designed as an electric motor which is provided to drive the work spindle 14.

Eine Elektronikeinheit 55 ist im Motorgehäuseteil 18 der Handwerkzeugmaschine 10 angeordnet und dazu vorgesehen, die elektromotorische Antriebseinheit 20 zu bestromen.An electronics unit 55 is arranged in the motor housing part 18 of the handheld power tool 10 and is provided to energize the electromotive drive unit 20.

Die Elektronikeinheit 55 erkennt hierbei, ob der elektrische oder magnetische Kreis geschlossen ist, sprich, ob das Zubehör 26 an oder auf die Handwerkzeugmaschine montiert ist.The electronics unit 55 detects whether the electrical or magnetic circuit is closed, that is to say whether the accessory 26 is mounted on or on the handheld power tool.

Figur 1 zeigt zwei Varianten, in denen die Montage der Schutzhaube 26b abgefragt wird. Figure 1 shows two variants in which the assembly of the protective hood 26b is queried.

Die Schutzhaube 26b weist einen nicht dargestellten Schutzhaubenbund auf. Wird die Schutzhaube 26b und damit der Schutzhaubenbund auf die Handwerkzeugmaschine 10 montiert, wird ein Hebelelement 60 bewegt. Das Hebeleelement 60 ist dabei als Bügel ausgeführt. Das Hebeleelement 60 betätigt dabei ein erstes Schaltelement 62. Das erste Schaltelement 62 ist beispielsweise ein Microschalter oder dergleichen. Bei Betätigung des ersten Schaltelements 62 wird die Information, dass die Schutzhaube 26b montiert ist, über zwei elektrische Leiter 64 an die Elektronikeinheit 55 weiter.The protective hood 26b has a protective hood collar, not shown. If the protective hood 26b and thus the protective hood collar is mounted on the handheld power tool 10, a lever element 60 is moved. The lever element 60 is designed as a bracket. The lever element 60 actuates a first switching element 62. The first switching element 62 is, for example, a microswitch or the like. When the first switching element 62 is actuated, the information that the protective hood 26b is mounted is passed on to the electronics unit 55 via two electrical conductors 64.

In der zweiten Variante ist ein Schub- und/Druckelement 66 aus dem Getriebegehäuse 12 der Handwerkzeugmaschine 10 geführt. Das Schub- und/Druckelement 66 ist dabei als Stößel ausgeführt und führt auf die Schutzhaube 26b. Wird die Schutzhaube 26b auf die Handwerkzeugmaschine 10 montiert, wird der Stößel 66 betätigt. Der Stößel 66 betätigt dabei ein zweites Schaltelement 68. Das zweite Schaltelement 68 ist beispielsweise ein Microschalter oder dergleichen. Bei Betätigung des zweiten Schaltelements 68 wird die Information, dass die Schutzhaube 26b montiert ist, über die elektrischen Leiter 64 an die Elektronikeinheit 55 weiter geleitet.In the second variant, a pushing and pushing element 66 is guided out of the gear housing 12 of the handheld power tool 10. The push and / or pressure element 66 is designed as a plunger and leads to the protective hood 26b. If the protective hood 26b is mounted on the handheld power tool 10, the plunger 66 is actuated. The plunger 66 actuates a second switching element 68. The second switching element 68 is, for example, a microswitch or the like. When the second switching element 68 is actuated, the information that the protective hood 26b is mounted is passed on to the electronics unit 55 via the electrical conductor 64.

Die Elektronikeinheit 55 bestromt die Antriebseinheit 20 der Handwerkzeugmaschine 10 nur dann, wenn die Kontaktelemente im montierten Zustand des Zubehörs 26 an oder auf der Handwerkzeugmaschine 10 miteinander verbunden sind.The electronics unit 55 only energizes the drive unit 20 of the handheld power tool 10 if the contact elements are connected to one another in the mounted state of the accessory 26 on or on the handheld power tool 10.

Figur 5 zeigt eine weitere erfindungsgemäße Ausführungsform. Die Handwerkzeugmaschine 10 weist ein Sicherheitselement 70 auf. Das Sicherheitselement 70 umfasst Elemente wie Schalter, Microschalter, Sensorelemente 72 und dergleichen, um ein montiertes Zubehör 26, wie einen Zusatzhandriff 26a und/oder eine Schutzhaube 26b oder dergleichen zu erkennen. Weiterhin weist das Sicherheitselement 70 eine Energieversorgungseinheit 74 eine Datenauswerteeinheit 76, eine Speichereinheit 78, eine Kommunikationseinheit 80 oder dergleichen auf. Die Elemente sind über mindestens ein Kabel 82 miteinander verbunden. Figure 5 shows a further embodiment of the invention. The handheld power tool 10 has a security element 70. The security element 70 comprises elements such as switches, microswitches, sensor elements 72 and the like in order to identify a mounted accessory 26, such as an additional handle 26a and / or a protective hood 26b or the like. The security element 70 also has an energy supply unit 74, a data evaluation unit 76, a storage unit 78, a communication unit 80 or the like. The elements are connected to one another via at least one cable 82.

Das Sicherheitselement 70 kommuniziert mit der Elektronik 55 über Funk, beispielsweise über BT, BLE, NFC, Wlan oder dergleichen.The security element 70 communicates with the electronics 55 via radio, for example via BT, BLE, NFC, WLAN or the like.

Es können auch Kontaktelemente auf der Handwerkzeugmaschine vorgesehen sein, wobei über die Kontaktelemente die Kommunikation laufen kann. Die Kontaktelemente können dabei an der Schutzhaube, am Schutzhaubenbund angebracht sein. Es ist aber auch vorstellbar, dass die Kontaktelemente an einem anderen, dem Fachmann als sinnvoll erscheinenden Ort an der Schutzhaube befestigbar sind.Contact elements can also be provided on the hand-held power tool, wherein communication can take place via the contact elements. The contact elements can be attached to the protective hood, to the protective hood collar. However, it is also conceivable that the contact elements can be attached to the protective hood at a different location that appears sensible to a person skilled in the art.

Außer der Erkennung der Zubehörs kann das Sicherheitselement 70 Parameter wie beispielsweise eine Temperatur, eine Vibration oder dergleichen erkennen und/oder aufzeichnen und an die Elektronikeinheit 55 kommunizieren. Die Elektronikeinheit 55 der Handwerkzeugmaschine 10 wertet die Parameter aus und leitet gegebenenfalls eine der folgenden Aktionen ein: Drehzahlstellung, Leistungsanpassung, Zusatzkühlung, eine Anzeige der Parameter der Handwerkzeugmaschine oder dergleichen.In addition to recognizing the accessories, the security element 70 can recognize and / or record parameters such as, for example, a temperature, a vibration or the like, and communicate them to the electronics unit 55. The electronics unit 55 of the handheld power tool 10 evaluates the parameters and, if necessary, initiates one of the following actions: speed setting, power adjustment, additional cooling, a display of the parameters of the handheld power tool or the like.

Das Sicherheitselement 70 kann mit einem mobilen Gerät 90 kommunizieren. Das Sicherheitselement 70, das mobile Gerät 90 und die Handwerkzeugmaschine 10 bilden dabei ein Netzwerk. Das mobile Gerät 90 ist beispielsweise als Smart Phone, Smart Band oder dergleichen ausgeführt. Insbesondere das mobile Gerät kann über einen Zugang zum Internet oder einem anderweitigen Netzwerk verfügen. Das Netzwerk ist insbesondere ein Ort, in dem Sicherheitseinstellungen getätigt, verwaltet und kontrolliert werden.The security element 70 can communicate with a mobile device 90. The security element 70, the mobile device 90 and the handheld power tool 10 form a network. The mobile device 90 is implemented, for example, as a smart phone, smart band or the like. In particular, the mobile device can have access to the Internet or some other network. In particular, the network is a place in which security settings are made, managed and controlled.

In Figur 6a-l ist eine Handwerkzeugmaschine 10 mit einem Zubehör 26 und mit einer Detektionseinheit 100 gezeigt. Die Detektionseinheit 100 umfasst zumindest einen Magnetfeldsensor 38 und zumindest einen Magneten 36. Das Zubehör 26 ist als ein Zusatzhandgriff 26a ausgebildet, der einen Griffteil 50 und einen Gewindezapfen 52 umfasst. Der Gewindezapfen 52 ist als zubehörseitiges Kontaktelement 28 ausgebildet. Die Detektionseinheit 100 weist einen Magneten 36 auf, der stirnseitig im Gewindezapfen 52 des Zusatzhandgriffs 26a angeordnet ist (siehe Fig. 6a). Der Magnet 36 ist beispielhaft derart im zubehörseitigen Kontaktelement 28 angeordnet, dass eine Ebene durch die Grenzfläche zwischen dem Nordpol und dem Südpol des Magneten 36 sich im Wesentlichen parallel zu der Längserstreckung 54 des Zusatzhandgriffs erstreckt. Eine Draufsicht für die Anordnung des Magneten 36 nach Fig. 6a ist in Fig. 6b gezeigt. Alternativ ist auch denkbar, dass die Ebene durch die Grenzfläche zwischen dem Nordpol und dem Südpol des Magneten 36 sich im Wesentlichen senkrecht zu der Längserstreckung 54 des Zusatzhandgriffs 26a erstreckt, wie in Fig. 6c beispielhaft gezeigt. In einer alternativen Ausführungsform ist ebenfalls denkbar, dass der Magnet 36 um das zubehörseitige Kontaktelement 28, insbesondere um den Gewindezapfen 52 herum, angeordnet ist, wie in Fig. 6d-f gezeigt. Vorteilhaft ist der Magnet 36 ringförmig ausgebildet. Der Magnet 36 liegt auf dem Griffteil 50 auf. Analog zu der vorherigen Ausführungsform sind unterschiedliche Orientierungen des Magneten 36 denkbar, die in Fig. 6e und f gezeigt sind. In Fig. 6e ist die Ebene durch die Grenzfläche zwischen dem Nordpol und dem Südpol des Magneten 36 im Wesentlichen senkrecht zu der Längserstreckung 54 des Zusatzhandgriffs 26a angeordnet, während in Fig. 6f die Ebene durch die Grenzfläche zwischen dem Nordpol und dem Südpol des Magneten 36 im Wesentlichen parallel zu der Längserstreckung 54 des Zusatzhandgriffs 26a angeordnet ist.In Figure 6a-l a handheld power tool 10 with an accessory 26 and with a detection unit 100 is shown. The detection unit 100 comprises at least one magnetic field sensor 38 and at least one magnet 36. The accessory 26 is available as a Additional handle 26a is formed which comprises a handle part 50 and a threaded pin 52. The threaded pin 52 is designed as a contact element 28 on the accessory side. The detection unit 100 has a magnet 36, which is arranged on the front side in the threaded pin 52 of the additional handle 26a (see FIG Figure 6a ). The magnet 36 is arranged, for example, in the accessory-side contact element 28 such that a plane through the interface between the north pole and the south pole of the magnet 36 extends essentially parallel to the longitudinal extension 54 of the auxiliary handle. A top view for the arrangement of the magnet 36 according to Figure 6a is in Figure 6b shown. Alternatively, it is also conceivable that the plane through the interface between the north pole and the south pole of the magnet 36 extends essentially perpendicular to the longitudinal extent 54 of the additional handle 26a, as in FIG Figure 6c shown as an example. In an alternative embodiment, it is also conceivable that the magnet 36 is arranged around the accessory-side contact element 28, in particular around the threaded pin 52, as in FIG Figures 6d-f shown. The magnet 36 is advantageously designed in the form of a ring. The magnet 36 rests on the handle part 50. Analogously to the previous embodiment, different orientations of the magnet 36 are conceivable, which are shown in FIG Figure 6e and f are shown. In Figure 6e the plane through the interface between the north pole and the south pole of the magnet 36 is arranged essentially perpendicular to the longitudinal extension 54 of the auxiliary handle 26a, while in FIG Fig. 6f the plane through the interface between the north pole and the south pole of the magnet 36 is arranged essentially parallel to the longitudinal extension 54 of the auxiliary handle 26a.

In Fig. 6g und h sind unterschiedliche Positionierungen eines einer Detektionseinheit 100 zugeordneten Magnetfeldsensors 38 gezeigt. Der Magnetfeldsensor 38 kann beispielhaft als ein Hall Sensor oder ein Rheed Schalter ausgebildet sein. Die Handwerkzeugmaschine 10 weist an dem Getriebegehäuseteil 12 zwei gegenüberliegende Gewindebohrungen 13, die als maschinenseitiges Kontaktelement 24 ausgebildet sind. In Fig. 6g ist der Magnetfeldsensor 38 am Ende der Gewindebohrung 13 angeordnet. Durch die Anordnung des Magnetfeldsensors im Inneren des Getriebegehäuseteils 12 wird der Magnetfeldsensor vorteilhaft vor Beschädigungen geschützt. Alternativ ist auch denkbar, dass der Magnetfeldsensor 38 um die Gewindebohrung 13 herum angeordnet ist, wie in Fig. 6g gezeigt. Die Anordnung des Magneten 36 und Magnetfeldsensors 38 der Detektionseinheit 100 sind vorteilhaft aufeinander abgestimmt. Beispielhaft korrespondiert die Anordnung des Magneten 36 aus Fig. 6a zu der Anordnung des Magnetfeldsensors 38 aus Fig. 6g und die Anordnung des Magneten 36 aus Fig. 6d zu der Anordnungen des Magnetfeldsensors 38 aus Fig. 6h.In Fig. 6g and H Different positions of a magnetic field sensor 38 assigned to a detection unit 100 are shown. The magnetic field sensor 38 can be designed, for example, as a Hall sensor or a Rheed switch. The handheld power tool 10 has two opposing threaded bores 13 on the gear housing part 12, which are designed as a contact element 24 on the machine side. In Fig. 6g the magnetic field sensor 38 is arranged at the end of the threaded hole 13. The arrangement of the magnetic field sensor in the interior of the gear housing part 12 advantageously protects the magnetic field sensor from damage. Alternatively, it is also conceivable that the magnetic field sensor 38 is arranged around the threaded hole 13, as in FIG Fig. 6g shown. The arrangement of the magnet 36 and magnetic field sensor 38 of the detection unit 100 are advantageously coordinated. For example, the arrangement of the magnet 36 corresponds to Figure 6a on the arrangement of the magnetic field sensor 38 Fig. 6g and the arrangement of the magnet 36 Fig. 6d to the arrangements of the magnetic field sensor 38 Fig. 6h .

In Fig. 6i bis Fig. 6k ist ein Zubehör gezeigt, das als Schutzhaube 26b ausgebildet ist. Die Schutzhaube 26b weist einen Schutzhabenflansch 60 auf, der lösbar verbindbar mit dem Getriebegehäuseteil 12 der Handwerkzeugmaschine 10 ausgebildet ist. Insbesondere ist der Schutzhaubenflansch 60 als zubehörseitiges Kontaktelement 28 ausgebildet. Die Schutzhaube 26b weist einen Magneten 36 auf, der halbkreisförmig um den Schutzhaubenflansch 60 angeordnet ist (siehe Fig. 6i). Alternativ sind auch andere Anordnungen des Magneten 36, wie beispielsweise verteilt auf der Schutzhaube 26b (siehe Fig. 6f) oder symmetrisch um den Schutzhaubenflansch 60 herum (siehe Fig. 6k) angeordnet.In Figures 6i to 6k an accessory is shown which is designed as a protective hood 26b. The protective hood 26b has a protective cover flange 60 which is designed such that it can be detachably connected to the gearbox housing part 12 of the handheld power tool 10. In particular, the protective hood flange 60 is designed as an accessory-side contact element 28. The protective hood 26b has a magnet 36 which is arranged in a semicircle around the protective hood flange 60 (see FIG Figure 6i ). Alternatively, other arrangements of the magnet 36, such as distributed on the protective hood 26b (see FIG Fig. 6f ) or symmetrically around the protective hood flange 60 (see Fig. 6k ) arranged.

Zur Detektion des Magneten 36 auf der Schutzhaube 26b kann die Handwerkzeugmaschine 10 ein Magnetfeldsensor 38 aufweisen, der auf der Abtriebsseite 15 des Gehäuses 11 der Handwerkzeugmaschine 10, insbesondere des Getriebegehäuseteils 12, angeordnet ist (siehe Fig. 6I). Die Abtriebsseite 15 ist insbesondere die Seite der Handwerkzeugmaschine 10, an der die Arbeitsspindel 14 aus dem Gehäuse 11 der Handwerkzeugmaschine 10 nach außen austritt.To detect the magnet 36 on the protective hood 26b, the hand-held power tool 10 can have a magnetic field sensor 38, which is arranged on the output side 15 of the housing 11 of the hand-held power tool 10, in particular the gear housing part 12 (see FIG Figure 6I ). The output side 15 is in particular the side of the handheld power tool 10 on which the work spindle 14 emerges from the housing 11 of the handheld power tool 10 to the outside.

Die Detektionseinheit 100 ist insbesondere dazu ausgebildet, eine Verbindung des maschinenseitigen Kontaktelements 24 mit dem zubehörseitigen Kontaktelements 28 zu detektieren. Vorteilhaft ist der Magnetfeldsensor 38 und der Magnet 36 derart angeordnet, dass eine Verbindung erst detektiert wird, sobald das Zubehör 26 vollständig an dem Gehäuse 11 der Handwerkzeugmaschine 10 montiert ist. In Fig. 6 erfasst die Detektionseinheit 100 über den Magnetfeldsensor 38 die Position des Magneten 36. Entspricht die Position des Magneten 36 einem sachgemäß montierten Zustand des Zubehörs 26, ist die Antriebseinheit 20 vorteilhaft über die Elektronikeinheit 55 bestrombar ausgebildet.The detection unit 100 is designed in particular to detect a connection between the machine-side contact element 24 and the accessory-side contact element 28. The magnetic field sensor 38 and the magnet 36 are advantageously arranged in such a way that a connection is only detected as soon as the accessory 26 is completely mounted on the housing 11 of the handheld power tool 10. In Fig. 6 the detection unit 100 detects the position of the magnet 36 via the magnetic field sensor 38. If the position of the magnet 36 corresponds to a properly installed state of the accessory 26, the drive unit 20 is advantageously designed to be energized via the electronics unit 55.

In Fig. 7 ist eine alternative Ausführungsform der Detektionseinheit 100 gezeigt. Die Detektionseinheit 100 umfasst einen kapazitiven Näherungsschalter 110, der dazu ausgebildet ist, Materialien zu detektieren, die das elektrische Feld des kapazitiven Näherungsschalters 110 beeinflussen. Der kapazitive Näherungsschalter 110 in Fig. 7 umfasst beispielhaft eine Spule 112, die als ein Teil eines elektromagnetischen Schwingkreises ausgebildet ist. Die Spule 112 ist um das maschinenseitige Kontaktelement 24, das beispielhaft als Gewindebohrung 13 ausgebildet ist, herum angeordnet. Das Zubehör 26 ist beispielhaft als Zusatzhandgriff 26a ausgebildet und umfasst ein zubehörseitiges Kontaktelement 28, welches als Gewindezapfen 52 ausgebildet ist. Das zubehörseitige Kontaktelement 28 ist beispielhaft aus einem magnetoresistiven Material ausgebildet. Der Schwingkreis oszilliert vorteilhaft auf seiner Resonanzfrequenz. Durchdringt das zubehörseitige Kontaktelement 28 die von der Spule 112 gebildete Öffnung zumindest teilweise, so wird die resonante Oszillation des Schwingkreises beeinflusst, insbesondere gedämpft. Die Detektionseinheit 100 ist insbesondere dazu ausgebildet, diese Dämpfung zu detektieren.In Fig. 7 an alternative embodiment of the detection unit 100 is shown. The detection unit 100 comprises a capacitive proximity switch 110, which is used for this is designed to detect materials that influence the electrical field of the capacitive proximity switch 110. The capacitive proximity switch 110 in Fig. 7 comprises, for example, a coil 112 which is designed as part of an electromagnetic resonant circuit. The coil 112 is arranged around the machine-side contact element 24, which is designed as a threaded hole 13, for example. The accessory 26 is designed, for example, as an additional handle 26a and comprises an accessory-side contact element 28, which is designed as a threaded pin 52. The accessory-side contact element 28 is formed, for example, from a magnetoresistive material. The resonant circuit advantageously oscillates at its resonance frequency. If the accessory-side contact element 28 at least partially penetrates the opening formed by the coil 112, the resonant oscillation of the resonant circuit is influenced, in particular damped. The detection unit 100 is designed in particular to detect this attenuation.

In Fig. 8a-c ist eine weitere Ausführungsform der Detektionseinheit 100 gezeigt. Die Detektionseinheit 100 umfasst insbesondere zumindest ein Drucksensorelement 120, das dazu ausgebildet ist, den Anpressdruck des Zubehörs 26 auf das Gehäuse 11 der Handwerkzeugmaschine 10 zu detektieren. Das Drucksensorelement 120 ist beispielhaft als Piezo Drucksensorelement ausgebildet und an der Außenfläche des Gehäuses 11 der Handwerkzeugmaschine 10, insbesondere an der Außenfläche des Getriebegehäuseteils 12, angeordnet. Vorteilhaft ist das Drucksensorelement 120 derart angeordnet, dass im montierten Zustand das Griffteil 50 des Zusatzhandgriffs 26a das Drucksensorelement 120 unmittelbar beaufschlagt und dadurch einen Anpressdruck auf das Drucksensorelement 120 bewirkt.In Figures 8a-c a further embodiment of the detection unit 100 is shown. The detection unit 100 comprises in particular at least one pressure sensor element 120 which is designed to detect the contact pressure of the accessory 26 on the housing 11 of the handheld power tool 10. The pressure sensor element 120 is designed, for example, as a piezo pressure sensor element and is arranged on the outer surface of the housing 11 of the hand-held power tool 10, in particular on the outer surface of the transmission housing part 12. The pressure sensor element 120 is advantageously arranged in such a way that, in the assembled state, the grip part 50 of the auxiliary handle 26a acts on the pressure sensor element 120 directly and thereby causes a contact pressure on the pressure sensor element 120.

In Fig. 8b ist eine alternative Anordnung des Drucksensorelements 120 gezeigt. Das Drucksensorelement 120 ist beispielhaft in einem Lagerflansch 17 des Getriebegehäuseteils 11 angeordnet. Im montierten Zustand beaufschlagt das zubehörseitige Kontaktelement 28 in Form eines Schutzhaubenflanschs 60 das Drucksensorelement 120. Vorteilhaft kann durch diese Anordnung die Befestigung einer Schutzhaube 26b detektiert werden.In Figure 8b An alternative arrangement of the pressure sensor element 120 is shown. The pressure sensor element 120 is arranged, for example, in a bearing flange 17 of the transmission housing part 11. In the assembled state, the accessory-side contact element 28 in the form of a protective hood flange 60 acts on the pressure sensor element 120. The attachment of a protective hood 26b can advantageously be detected by this arrangement.

In Fig. 8c ist eine alternative Ausführungsform des Drucksensorelements 120 gezeigt. Das Drucksensorelement 120 ist beispielhaft kreisförmig entlang einer Außenfläche des Lagerflansches 17 des Getriebegehäuseteils 12 angeordnet. Das Drucksensorelement 120 Ist insbesondere als eine berührungsempfindliche Oberfläche 122 ausgebildet. Die berührungsempfindliche Oberfläche 122 ist als Teil einer Kondensatoreinheit ausgebildet. Im montierten Zustand beaufschlagt das Zubehör 26 die berührungsempfindliche Oberfläche derart, dass eine Verformung, insbesondere eine Verbiegung um wenige µm der berührungsempfindlichen Oberfläche 122 bewirkt wird. Die Verformung der berührungsempfindlichen Oberfläche 122 hat einen direkten Einfluss auf die Kapazität der Kondensatoreinheit. Über die Veränderung der Kapazität der Kondensatoreinheit ist vorteilhaft eine Befestigung des Zubehörs an dem Gehäuse 11 der Handwerkzeugmaschine 10 detektierbar. Alternativ ist auch denkbar, dass das Drucksensorelement 120, insbesondere die berührungsempfindliche Oberfläche 122, am Ende einer Gewindebohrung 13 der Handwerkzeugmaschine 10 angeordnet ist.In Figure 8c An alternative embodiment of the pressure sensor element 120 is shown. The pressure sensor element 120 is, for example, circular along an outer surface of the bearing flange 17 of the gear housing part 12 is arranged. The pressure sensor element 120 is designed in particular as a touch-sensitive surface 122. The touch-sensitive surface 122 is designed as part of a capacitor unit. In the assembled state, the accessory 26 acts on the touch-sensitive surface in such a way that a deformation, in particular a bending of a few μm, of the touch-sensitive surface 122 is brought about. The deformation of the touch-sensitive surface 122 has a direct influence on the capacitance of the capacitor unit. A fastening of the accessories to the housing 11 of the handheld power tool 10 can advantageously be detected via the change in the capacitance of the capacitor unit. Alternatively, it is also conceivable for the pressure sensor element 120, in particular the touch-sensitive surface 122, to be arranged at the end of a threaded hole 13 of the handheld power tool 10.

In Fig. 9a und Fig. 9b ist eine weitere alternative Ausführungsform der Detektionseinheit 100 gezeigt. Die Detektionseinheit 100 umfasst ein Luftdrucksensorelement 130, das dazu ausgebildet ist, den Luftdruck zu ermitteln. In Fig. 9a wird beispielhaft eine statische Luftdruckveränderung detektiert. Das maschinenseitige Kontaktelement 24 ist als Gewindebohrung 13 des Getriebegehäuseteils 12 ausgebildet und das zubehörseitige Kontaktelement 28 ist als Gewindezapfen 52 eines Zusatzhandgriff 26a ausgebildet. Das Luftdrucksensorelement 130 ist in einem von der Gewindebohrung 13 aufgespannten Raum angeordnet. Insbesondere ist das Luftdrucksensorelement 130 an einem einer Eingangsöffnung 56 der Gewindebohrung 13 gegenüberliegenden Ende der Gewindebohrung 13 angeordnet. Über die Eingangsöffnung 56 der Gewindebohrung 13 wird der Gewindezapfen 52 des Zusatzhandgriffs 26a in dem Getriebegehäuseteil 12 aufgenommen. Im montierten Zustand ist der Zusatzhandgriff 26a mit dem Gehäuse 11 der Handwerkzeugmaschine 10 verschraubt, wodurch der von der Gewindebohrung 13 aufgespannte Raum im Wesentlichen luftdicht verschlossen ist. Durch das Einschrauben wird die Luft im von der Gewindebohrung 13 aufgespannten Raum komprimiert, wodurch der Druck lokal ansteigt. Die Detektionseinheit 100, insbesondere das Luftdrucksensorelement 130 der Detektionseinheit, ist vorteilhaft dazu ausgebildet, den Druckanstieg zu detektieren.In Figure 9a and Figure 9b a further alternative embodiment of the detection unit 100 is shown. The detection unit 100 comprises an air pressure sensor element 130, which is designed to determine the air pressure. In Figure 9a a static change in air pressure is detected, for example. The machine-side contact element 24 is designed as a threaded bore 13 of the gear housing part 12 and the accessory-side contact element 28 is designed as a threaded pin 52 of an additional handle 26a. The air pressure sensor element 130 is arranged in a space spanned by the threaded bore 13. In particular, the air pressure sensor element 130 is arranged at an end of the threaded bore 13 opposite an inlet opening 56 of the threaded bore 13. The threaded pin 52 of the auxiliary handle 26a is received in the gear housing part 12 via the inlet opening 56 of the threaded bore 13. In the assembled state, the additional handle 26a is screwed to the housing 11 of the hand-held power tool 10, as a result of which the space spanned by the threaded bore 13 is essentially airtight. By screwing in, the air in the space spanned by the threaded hole 13 is compressed, as a result of which the pressure increases locally. The detection unit 100, in particular the air pressure sensor element 130 of the detection unit, is advantageously designed to detect the pressure increase.

Alternativ ist auch denkbar, dass eine dynamische Luftdruckveränderung von der Detektionseinheit 100 detektiert wird, wie beispielhaft in Fig. 9b gezeigt ist. In diesem Ausführungsbeispiel weist der von der Gewindebohrung 13 des Gehäuses 11 der Handwerkzeugmaschine 10 aufgespannte Raum neben der Eingangsöffnung 56 eine weitere Durchgangsöffnung 58 auf. Die Durchgangsöffnung 58 ist beispielhaft an dem der Eingangsöffnung 56 gegenüberliegenden Ende des von der Gewindebohrung 13 aufgespannten Raums angeordnet. Die Handwerkzeugmaschine 10 weist einen Lüfter (nicht dargestellt) auf, der dazu ausgebildet ist, die Antriebseinheit 20 der Handwerkzeugmaschine 10 zu kühlen. Vorteilhaft ist die Durchgangsöffnung 58 derart im Gehäuse 11 der Handwerkzeugmaschine 10 angeordnet, dass Kühlluft über die Eingangsöffnung 56 der Gewindebohrung 13, durch die Durchgangsöffnung 58 der Gewindebohrung 13 in Richtung des Lüfters gesogen wird. Im montierten Zustand ist der Gewindezapfen 52 des Zusatzhandgriffs 26a in der Eingangsöffnung 56 der Gewindebohrung 13 angeordnet und verschließt diese dadurch. Die Unterbrechung hat zur Folge dass der Kühlluftstrom 59 unterbrochen ist und sich im Inneren des Gehäuses ein Unterdruck ausbildet. Im Inneren des Gehäuses 11 ist das Luftdrucksensorelement 130 angeordnet, welches dazu ausgebildet ist, die Veränderung des Luftdrucks zu detektieren. Das Luftdrucksensorelement 130 ist beispielhaft über der Durchgangsöffnung 58 der Gewindebohrung 13 angeordnet. Alternativ ist auch denkbar, dass der Kühlluftstrom derart durch das Gehäuse 11 der Handwerkzeugmaschine 10 geleitet wird, dass er über die Eingangsöffnung 56 der Gewindebohrung 13 aus dem Gehäuse austritt. In diesem Fall hat ein Verschließen der Eingangsöffnung 56 einen Überdruck zur Folge, der ebenfalls von dem Luftdrucksensorelement 130 detektierbar ist.Alternatively, it is also conceivable that a dynamic change in air pressure is detected by the detection unit 100, as exemplified in FIG Figure 9b is shown. In this exemplary embodiment, the space spanned by the threaded bore 13 of the housing 11 of the handheld power tool 10 has a further through opening 58 in addition to the inlet opening 56. The through opening 58 is arranged, for example, at the end of the space spanned by the threaded bore 13 opposite the inlet opening 56. The handheld power tool 10 has a fan (not shown) which is designed to cool the drive unit 20 of the handheld power tool 10. The through-opening 58 is advantageously arranged in the housing 11 of the hand-held power tool 10 in such a way that cooling air is drawn in via the inlet opening 56 of the threaded bore 13, through the through-opening 58 of the threaded bore 13, in the direction of the fan. In the assembled state, the threaded pin 52 of the additional handle 26a is arranged in the inlet opening 56 of the threaded bore 13 and thereby closes it. The interruption has the consequence that the cooling air flow 59 is interrupted and a negative pressure develops inside the housing. The air pressure sensor element 130, which is designed to detect the change in the air pressure, is arranged in the interior of the housing 11. The air pressure sensor element 130 is arranged, for example, above the through opening 58 of the threaded bore 13. Alternatively, it is also conceivable that the cooling air flow is passed through the housing 11 of the handheld power tool 10 in such a way that it exits the housing via the inlet opening 56 of the threaded bore 13. In this case, closing the inlet opening 56 results in an overpressure which can also be detected by the air pressure sensor element 130.

Es ist ebenfalls denkbar, die Befestigung eines Zubehörs 26 in Form einer Schutzhaube 26b über ein Luftdrucksensorelement 130 zu detektieren, was im Folgenden nur beschrieben, allerdings nicht anhand einer Figur gezeigt ist. In Analogie zu den vorherigen Ausführungsform kann der Lagerflansch des Getriebegehäuseteils eine Durchgangsöffnung aufweisen, wobei das Luftdrucksensorelement entlang der Strömungsrichtung zwischen der Durchgangsöffnung und dem Lüfter angeordnet ist. Im montierten Zustand wird die Durchgangsöffnung im Lagerflansch vorteilhaft durch den Schutzhaubenflansch derart abgedeckt, dass der Kühlluftstrom durch die Durchgangsöffnung unterbrochen wird und, abhängig von der Strömungsrichtung, ein Überdruck oder Unterdruck entsteht, der von dem Luftdrucksensorelement detektierbar ist.It is also conceivable to detect the attachment of an accessory 26 in the form of a protective hood 26b via an air pressure sensor element 130, which is only described below, but not shown on the basis of a figure. In analogy to the previous embodiment, the bearing flange of the transmission housing part can have a through opening, the air pressure sensor element being arranged along the flow direction between the through opening and the fan. In the assembled state, the passage opening in the bearing flange is advantageously covered by the protective hood flange in such a way that the cooling air flow through the The passage opening is interrupted and, depending on the direction of flow, an overpressure or underpressure arises which can be detected by the air pressure sensor element.

Claims (11)

  1. Hand-power tool (10), in particular an angle grinder, having a housing (11), in particular a transmission housing part (12), wherein the housing (11), in particular the transmission housing part (12), has at least one machine-side contact element (24), having an accessory (26) which is configured as an ancillary handle, wherein the accessory (26) has at least one accessory-side contact element (28), wherein the machine-side contact element (24) and the accessory-side contact element (28) are releasably connectable to one another, characterized in that the detection unit (100) has a magnetic field sensor (38) and the magnetic field sensor (38) is disposed in such a manner that a connection is detected as soon as the accessory (26) is assembled on the housing (11) of the hand-power tool (10), wherein the machine-side contact element (24) is embodied as a magnetic field sensor (38) and the accessory-side contact element (28) is embodied as a magnet (36), wherein the ancillary handle (26a) has a threaded pin (28) in which the magnet (36) is disposed.
  2. Hand-held power tool (10) according to Claim 1, characterized in that the machine-side contact element (24) and/or the accessory-side contact element (28) are/is assigned to a detection unit (100) which is configured for detecting mechanical fastening of the accessory (26) to the housing (11) of the hand-held power tool(10).
  3. Hand-held power tool (10) according to one of the preceding claims, characterized in that an electromotive drive unit (20), in particular an electric motor, is disposed in a motor housing part (18) of the hand-power tool (10), said electric motor being provided for driving a work spindle (14).
  4. Hand-held power tool (10) according to Claim 3, characterized in that an electronics unit (55) is disposed in the hand-held power tool (10), wherein the electronics unit (55) is provided for energizing the electromotive drive unit (20).
  5. Hand-held power tool (10) according to Claim 4, characterized in that the electronics unit (55) energizes the drive unit (20) as soon as the machine-side contact element (24) and the accessory-side contact element (28) in the assembled state of the accessory (26) for the hand-power tool (10) are connected to one another.
  6. Hand-held power tool (10) according to one of the preceding claims, characterized in that the accessory (26) is an ancillary handle (26a), which is provided to be gripped in particular by an operator of the hand-held power tool.
  7. Hand-held power tool (10) according to one of the preceding claims, characterized in that the accessory (26) is a protective hood (26b) which is provided for protecting an operator of the hand-held power tool (10) during operation of the hand-held power tool (10) against sparks and/or material particles that are produced during operation of the hand-held power tool (10), and/or against fragments of a disk, broken during operation, that are ejected with great force.
  8. Hand-held power tool (10) according to one of Claims 2 to 7, characterized in that the detection unit (100) has an electrical connection element (30) .
  9. Hand-held power tool (10) according to one of the preceding claims, characterized in that the machine-side contact element (24) is implemented as at least one electrical connection element (30), and the accessory-side contact element (28) is composed of electrically conductive material.
  10. Hand-held power tool (10) according to one of the preceding claims, characterized in that characterized in that, in the case of a fitted accessory (26b), at least one switching element (62, 68) is able to be activated, wherein upon activtion of the switching element (62, 68), at least one item of information, concerning the fact that the accessory (26b) is fitted, is relayed to the electronics unit (55), in particular via at least one electrical conductor (64).
  11. Hand-held power tool (10) according to one of the preceding claims, characterized in that the hand-held power tool (10) has at least one safety element (70), wherein the safety element (70) can communicate with the hand-held power tool (10), the electronics unit (55) and/or a mobile device (90) .
EP16766584.3A 2015-09-29 2016-09-19 Hand-held power tool having at least one machine-side contact element Active EP3356089B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015218713 2015-09-29
DE102016216794.4A DE102016216794A1 (en) 2015-09-29 2016-09-06 Hand tool with at least one machine-side contact element
PCT/EP2016/072169 WO2017055125A1 (en) 2015-09-29 2016-09-19 Hand-held power tool having at least one machine-side contact element

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EP3356089A1 EP3356089A1 (en) 2018-08-08
EP3356089B1 true EP3356089B1 (en) 2020-11-11

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EP (1) EP3356089B1 (en)
DE (1) DE102016216794A1 (en)
WO (1) WO2017055125A1 (en)

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Publication number Publication date
EP3356089A1 (en) 2018-08-08
US10857645B2 (en) 2020-12-08
US20180272494A1 (en) 2018-09-27
DE102016216794A1 (en) 2017-03-30
WO2017055125A1 (en) 2017-04-06

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