EP3000562A1 - Machine-outil electrique dotee d'un element de commutation a actionnement manuel - Google Patents

Machine-outil electrique dotee d'un element de commutation a actionnement manuel Download PDF

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Publication number
EP3000562A1
EP3000562A1 EP15178036.8A EP15178036A EP3000562A1 EP 3000562 A1 EP3000562 A1 EP 3000562A1 EP 15178036 A EP15178036 A EP 15178036A EP 3000562 A1 EP3000562 A1 EP 3000562A1
Authority
EP
European Patent Office
Prior art keywords
drive motor
switch element
magnetic core
tool housing
electric machine
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.)
Granted
Application number
EP15178036.8A
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German (de)
English (en)
Other versions
EP3000562B1 (fr
Inventor
Stefan Heess
Joern Stock
Manfred Lutz
Thomas Schomisch
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3000562A1 publication Critical patent/EP3000562A1/fr
Application granted granted Critical
Publication of EP3000562B1 publication Critical patent/EP3000562B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the present invention relates to a power tool with a tool holder and a tool housing, in which a drive motor for driving the tool holder is arranged and to which a manually operable switch element for actuating a drive motor associated, electrical on / off switch is arranged, wherein an electromagnet is provided for mechanically locking the manually operable switch element in the energized state of the drive motor.
  • Such electric power tools are known, which are e.g. are designed in the manner of angle grinders and have as a manually actuated switch elements slide switch for switching on and off of an associated drive motor.
  • the slide switches do not need to be permanently actuated during continuous operation of the electric machine tools, they are for convenient handling by a user in the on state, e.g. mechanically lockable.
  • Such mechanically lockable slide switches may be designed to eliminate a corresponding supply voltage of the drive motor, such as e.g. when pulling the power plug of the power tool or when responding to an overcurrent protection in a local AC distribution to put automatically with the aid of electromagnetic actuators in the safe off state.
  • this describes CN 101 882 523 A an electric on / off switch with an integrated electromagnet (sg "power-failure-restartprotection” switch), wherein the electromagnet in the voltage-supplied or energized state generates a geometric undercut for mechanical locking of the electrical switch in its on position. In the de-energized or de-energized state of the undercut is canceled regardless of the current operating state and the electric switch automatically returns to the safe, switched-off switching position.
  • This electrical switch has a spatially compact design and is suitable for use with power tools such as angle grinders and polishing machines and prevents them in case of an external power interruption uncontrolled restart.
  • the object of the invention is therefore to provide a new power tool that has a cost-effective, manually operable and mechanically and electromagnetically lockable switch element.
  • a power tool with a tool holder and a tool housing, in which a drive motor for driving the tool holder is arranged and to which a manually operable switch element for actuating a drive motor associated, electrical on / off switch is arranged.
  • An electromagnet is provided for mechanically locking the manually operable switch element in the energized state of the drive motor.
  • the electromagnet is arranged in the motor circuit of the drive motor and has a magnetic core, which is magnetically excited in the energized state of the drive motor by at least one electrical line, which is associated with the drive motor.
  • the invention thus makes it possible to provide a power tool, in which by the grinding of the electromagnet in the motor circuit, the structural design is simplified with a simultaneous cost reduction, since no complete electromagnet as a separate component for mechanical Locking of the switch element in the energized state of the drive motor is necessary.
  • assemblies which are necessary in any case for the electric machine tool, in particular a motor convection and at least one supply line of the drive motor can be shared.
  • the at least one electrical line forms, at least in sections, a motor winding of the drive motor or a supply line to the drive motor, which surrounds the magnet core at least in sections.
  • the manually operable switch element is slidably and pivotally received on the tool housing and coupled by means of a sliding member with the electrical on / off switch.
  • a rocker provided with a plunger is pivoted on the magnetic core and biased by a spring member in the direction of the tool housing, that the plunger in the de-energized state of the drive motor engages at least partially in a holding opening of the tool housing.
  • the manually operable switch element has a holding member for locking on the tool housing in the locking operation of the electromagnet.
  • the drive motor switches off automatically in the event of an interruption of the power supply of the drive motor to increase safety at work.
  • a reconnection is possible here only by an active user action with recurring power to the motor circuit.
  • the magnetic core is laminated and provided with a short-circuit winding.
  • a rectifier circuit can be integrated into the Motonivicklung, which generates a rectified current in the corresponding winding section and thus enables a permanent magnetic force without zero power crossings.
  • the magnetic core is arranged at least approximately parallel and / or coaxially to the longitudinal axis of the tool housing and the manually operable switch element on the electrical on / off switch and / or on the tool housing is arranged displaceable and pivotable that the electrical on / off switch for switching on and off of the drive motor by means of a formed on the switch element start-up contour is actuated.
  • the switch element is preferably in a remote from the tool holder, rear, e.g. Power line side end portion of the tool housing arranged, wherein an actuating plunger of the electrical on / off switch is orthogonal to the longitudinal axis of the tool housing and is operated directly from the manually operable switch element.
  • the magnetic core is axially biased by a spring in the direction of a holding opening of the tool housing and on the magnetic core, a plunger is formed, which is adapted to engage at least partially in the holding opening of the tool housing in the de-energized state of the drive motor.
  • a holding member is formed on the manually operable switch element, which is held in the energized state of the drive motor and retracted plunger in the holding opening of the tool housing.
  • the holding member in the de-energized state of the drive motor by means of the plunger from the holding opening Nrumblebar.
  • the magnetic core is laminated and provided with a short-circuit winding.
  • Fig. 1 shows a power tool 10, which is formed according to an embodiment in the manner of a hand-held angle grinder and having a drive motor 12, which may be any type of motor, such as an AC motor, a universal motor, a commutated motor or a DC motor.
  • the drive motor 12 serves to drive a drive shaft 14, which is connected via an angle gear 16 and an output shaft 18 with a arranged on the output shaft 18 tool holder 20, wherein the tool holder 20 for receiving a rotating drivable insert tool 22, for example, a grinding, roughing or cutting disc is formed.
  • the drive motor 12 is switched on and off by means of a displaceable on a tool housing 24 of the power tool 10 and pivotable switch element 30.
  • the tool housing 24 is preferably rod-shaped.
  • a power line 44 for supplying alternating current, e.g. introduced from a public power supply network to the drive motor 12 in the tool housing 24.
  • the power supply for the drive motor 12 is realized here only by way of example by means of the power line 44 via the public power supply network, can alternatively or additionally but also with one or more of the power tool 10 associated battery packs done. It should be pointed out that the mode of operation and construction of a suitable drive motor or a suitable angle grinder are sufficiently known to the person skilled in the art from the prior art. Therefore, for the sake of simplicity and brevity of description, a further description thereof will be omitted here.
  • the manually operable switch element 30 is preferably coupled via a parallel to a longitudinal axis 32 of the tool housing 24 sliding sliding member 34 with an actuating plunger 36 of a provided with a switch housing 46, electric on / off switch 40.
  • the actuating tappet 36 is preferably axially prestressed by means of a compression spring 48 integrated, for example, in the switch housing 46.
  • the actuating plunger 36 For closing electrical switch contacts 50, 52 of the electric on / off switch 40 and for energizing the drive motor 12, the actuating plunger 36 must therefore at least partially into the switch housing 46 of the electric on / off switch 40 against the spring action of the compression spring 48 by means of the sliding member 34 parallel to the longitudinal axis 32 be pressed.
  • a tool housing 24 facing, for example, cuboidal holding member 38 is formed on the underside.
  • This first embodiment of an electromagnet 100 has a U-shaped magnetic core 102 which is magnetically energized when the drive motor 12 is energized by its motor winding 106 wound with an electrical line 104.
  • the magnetic core 102 is at least partially enclosed by the motor winding 106 and the line 104.
  • rocker 110 is biased by a spring member 112 in the direction of the tool housing 24 that the plunger 108 in the de-energized state of the drive motor 12 due to the force of the spring member 112 at least partially engages in a holding opening 114 of the tool housing 24.
  • the holding member 38 In the energized state of the drive motor 12, the holding member 38 - at least partially introduced into the correspondingly designed holding opening 114 due to the then energized by the fully energized solenoid 100 plunger 108 of the rocker 110, so that the drive motor 12 even with a release of the switch element 30 through a user continues to run to allow a comfortable continuous operation of the power tool 10.
  • the holding member 38 of the switch element 34 hooks in this case mechanically fixed due to the direction of the rear end portion 42 directed and acting on the actuating plunger 36 of the electric on / off switch 40 spring force of the compression spring 48 in the holding opening 114 of the tool housing 24.
  • the electromagnet 100 goes into the de-energized or non-magnetized state and thus becomes non-magnetic, so that the plunger 108 of the rocker 110 due to the force of the spring member 112, the holding member 38 from the holding opening 114 pushes out and the switch element 30 due to the force of the compression spring 48 of the electrical on / off switch 40 automatically and immediately in his in Fig. 1 illustrated switch off position.
  • the electrical switch contacts 50, 52 are opened, so that the motor circuit is interrupted and restarting the drive motor 12 is reliably excluded in a sudden return of power without active manual actuation of the switch element 30 by a user.
  • Fig. 2 and Fig. 3 - to which reference is also made at the same time - show the manually operable switch element 30 of Fig. 1 in its off and on position.
  • the switch element 30 and the sliding member 34 coupled thereto are in their rearmost position relative to the end section 42 of the tool housing 24.
  • the lower side formed on the sliding member 30 holding member 38 is out of engagement with the holding hole 114 in the tool housing 24, whereas the plunger 108 of the rocker 110 due to the action of the spring member 112 and the de-energized or unmagnetinstrumenten electromagnet 100 in at least partially engaged with the holding hole 114.
  • the rocker 110 is lifted from the U-shaped magnetic core 102 by the force of the spring member 112, since the trained with the at least one electrical line 104 Motonivicklung 106 is de-energized, so that at the same time no magnetic excitation in the magnetic core 102 is present.
  • a user To turn on the drive motor 12, a user must switch element 30 from the off position in Fig.
  • the switch member 30 takes in this movement with the sliding member 34, whereby the actuating plunger 36 of the electric on / off switch 40 is actuated against the spring force of the compression spring 48 and the electrical switch contacts 50, 52 close, so that the motor circuit of Drive motor 12 is energized and at the same time the solenoid 100 is magnetized by means of the then also current-carrying Motonivicklung 106.
  • the rocker 110 is attracted by the magnetic core 102, as a result of which the plunger 108 is pulled out of the retaining element 114 into the retaining hole 114 practically synchronously with it, and the locking of the switch element 30 on the tool housing 24 is engaged.
  • the switch element 30 Due to the axial bias of the sliding member 34 by means of the axially resiliently biased actuating tappet 36 of the electrical on / off switch 40, the switch element 30 remains after its release by the user and uninterrupted power and no active user-side shutdown in the closed position of Fig. 3 in which the drive motor 12 is permanently running. As a result, a comfortable and fatigue-free continuous operation of the power tool is possible for a user.
  • the holding opening 114 has at an example to the rear end portion 42 of the tool housing 24 facing wall 130 via a chamfer 132.
  • the motor winding 106 is de-energized or goes into the de-energized state, whereby at the same time the magnetization of the magnetic core 102 of the electromagnet 100 drops away.
  • the rocker 110 is lifted immediately and automatically by the magnetic core 102 due to the force of the spring member 112 and the formed on her plunger 108 pushes the holding member 38 of the switch member 30 out of the holding hole 114, so that the axially resiliently biased actuating plunger 36 of the electric / Off switch 40, the switch member 30 can retract by means of the sliding member 34 in the direction of the rear end portion 42 of the tool housing 24 until the switch-off position of the switch element 30 of Fig. 2 is reached again and the drive motor 12 is turned off or de-energized.
  • Fig. 4 shows the exemplary U-shaped magnetic core 102 of Fig. 1 to Fig. 3 , which preferably has two legs 140, 142 which run parallel to one another and are interconnected via a base section 144.
  • This base portion 144 is preferably in addition to the motor winding 106 of FIG Fig. 1 with a short-circuit winding 146 for generating a phase shift between the magnetic field and the current wrapped so that an AC operation is possible.
  • a rectifier circuit may be provided in the respective winding regions.
  • the magnetic core 102 is preferably laminated, ie formed with a plurality of stacked, mutually congruent U-shaped plates 148, each having a low material thickness and electrically isolated from each other.
  • the electromagnet 200 preferably has an at least essentially cylindrical magnetic core 202 which is located in the tool housing 24 of FIG Fig. 1 parallel and / or coaxial with the longitudinal axis 32 is slidably received and is biased axially resiliently by means of a preferably designed as a cylindrical compression spring spring 204.
  • the spring 204 is preferably supported for this purpose on the one hand on the tool housing 24 and on the other hand on the magnetic core 202.
  • the cylindrical magnetic core 202 preferably has a disk-shaped stop 206 for axial travel limitation, which rests against the tool housing 24 in the de-energized state or in the non-magnetized state of the magnetic core 202.
  • the cylindrical magnetic core 202 preferably continues towards the rear end portion 42 of the tool housing 24 in a plunger 208, which illustratively has a significantly reduced diameter compared to a diameter of the magnetic core 202.
  • the plunger 208 protrudes in the de-energized or non-magnetized state of the magnetic core 202 due the force of the spring 204 at least partially into a holding opening 210 of the tool housing 24 inside.
  • the power line 44 which is electrically connected to an electrical on / off switch 212.
  • This preferably has an actuation tappet 214, which, as a further difference from the first embodiment for closing and opening two electrical switching contacts 216, 218, can be actuated preferably at least substantially transversely to the longitudinal axis 32 and which is axially prestressed by means of a compression spring 220.
  • the two switching contacts 216, 218 preferably close when the actuating plunger 214 against the force of the compression spring 220 in the direction of a switch housing 222 is at least partially pressed into this.
  • a manually operable switch element 230 is preferably mounted by means of a slot 232 and a pin 234 received therein pivotably and slidably mounted on the switch housing 222 and the tool housing 24.
  • the switch element 230 can thus carry out a displacement movement parallel to the longitudinal axis 32 of the tool housing 24 and a slight pivoting movement relative thereto.
  • the pin 234 may - as shown here by way of example - be formed on the switch housing 222 or on the tool housing 24.
  • the switch element 230 preferably has a peg-shaped holding member 236 which, in the switched-on position of the switch element 230 (cf. Fig. 6 ) at least partially in the holding opening 210 of the tool housing 24 can be introduced.
  • a chamfer 242 which opens in the direction of the holding member 236 is preferably additionally formed on a wall 240 in the region of the holding opening 210.
  • the motor circuits assigned to the supply lines 248, 250 and at least partially the motor winding 106 of Fig. 1 form.
  • At least one of the magnetic core 202 preferably helically extending electrical line 246 surrounds the magnetic core 202 of the electromagnet 200 to form a cylindrical winding 252 having a plurality of turns 254 such that this at the passage of current through the line 246 in contrast to the first embodiment via this line 246 is magnetically excited or magnetized. Since the power supply of the drive motor 12 necessary and the motor circuit associated electrical line 246 at the same time forms the winding 252 for magnetic excitation of the electromagnet 200 in the closed position of the switch element 230, this can be realized with a reduced component and cost.
  • Fig. 5 is the manually operable switch element 230 in its off position in which the electrical contacts 216, 218 of the on / off switch 212 are open and the drive motor 12 and the solenoid 200 are de-energized.
  • the user pushes the switch element 230 so far in a direction away from the rear end portion 42 direction parallel to the longitudinal axis 32 of the tool housing 24 of Fig. 1 until the in Fig. 6 illustrated closed position of the switch element 230 is reached.
  • the holding member 236 of the switch element 230 slides at least in the last phase of its movement along the chamfer 242 until the holding member 236 is at least partially received in the holding opening 210 from the tool housing 24.
  • the plunger 208 is not opposed to this insertion movement of the holding member 236, because the start-up contour 238 pushes the actuating plunger 214 at least partially into the switch housing 222 at the same time by the user-side displacement of the switch element 230, whereby the electrical switching contacts 216, 218 of the on / off Close switch 212 and the drive motor 12 and the winding 252 of the magnetic core 202 of the electromagnet 200 are supplied synchronously with power. At the same time, the plunger 208 is pulled out of the holding opening 210 against the force of the compression spring 206 and is no longer counter to the insertion movement of the holding member 236.
  • the switch element 230 In the transition from the off position of Fig. 5 in the on position of Fig. 6 the switch element 230 preferably performs a displacement movement parallel to the longitudinal axis 32 and only a slight pivoting movement about the pin 234 when threading the retaining element 236 into the retaining opening 210 of the tool housing 24.
  • Fig. 7 shows the preferably at least approximately cylindrical magnetic core 202 of the electromagnet 200 of Fig. 5 and Fig. 6 who like at Fig. 5 and Fig. 6 described at least partially surrounded by the formed by the electrical line 246 winding 252.
  • the winding 252 is covered with a short-circuit winding 270.
  • the magnetic core 202 is formed for a low-loss AC operation with a plurality of congruent and stacked, and electrically insulated from each other, each circular plates 272.
  • Fig. 8 shows a third embodiment of an electromagnet 300 with the switch element 230 of FIG Fig. 5 and Fig. 6 ,
  • This preferably has a U-shaped magnetic core 302, on whose first leg 304 preferably a rocker 306 is pivotably articulated.
  • the rocker 306 In the energized state of the electromagnet 300, the rocker 306 is located on the first leg 304 and a second leg 308 of the U-shaped magnetic core 302 at.
  • a plunger 310 directed away from the magnetic core 302 is preferably formed on the rocker 306 .
  • the rocker 306 is preferably by means of a spring member 312-which is supported between the tool housing 24 and the rocker 306 - in the direction of the holding opening 210 in the tool housing 24 of Fig. 1 mechanically prestressed, so that the plunger 310 formed on the rocker 306 is received at least partially in the holding opening 210 of the tool housing 24 in the de-energized state of the electromagnet 300.
  • the U-shaped magnetic core 302 of the electromagnet 300 is preferably a cylindrical one Winding 314 magnetically energizable, comprising the magnetic core 302 in the form of at least one turn 316.
  • the switch element 230 is in its switch-off position, ie the electrical switch contacts 216, 218 of the electrical on / off switch 212 are open, so that no current flows via the power line 44 and the two electrical switch contacts 216, 218, the electrical lines 244, 246 and the supply lines 248, 250 connected thereto can flow to the drive motor 12 and the power tool 10 of Fig. 1 is switched off all poles.
  • the plunger 310 is at least partially received in the holding opening 210 due to the force of the spring member 312, so that the holding member 214 is ejected therefrom and the switch element 230 due to the force of the compression spring 220 of the actuating plunger 214 of the electric On / Off switch 212 is in the off position or its lifted off the tool housing 24 position.
  • the third embodiment of the electromagnet 300 shown here also corresponds in terms of its structural design and its mode of operation of the second embodiment according to the Fig. 5 and Fig. 6 with magnetic excitation of the electromagnet through at least one coil-shaped electrical supply line of the motor circuit, wherein the cylindrical magnetic core is replaced by the U-shaped magnetic core 302.
  • the electromagnet 300 when switching between the switch-on and the off position of the switch element 230 is therefore for the sake of clarity and clarity of the description to the explanations of Fig. 5 and Fig. 6 directed.
  • the term "motor circuit” includes all lines that for energizing the drive motor 12 of Fig. 1 are electrically connected thereto. Accordingly, the “motor circuit” includes both for the realization of the motor or stator winding 106 of Fig. 1 used lines or winding wires, as well as a line that the Statonivicklung with the on / off switch 40 of Fig. 1 electrically conductive connects, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP15178036.8A 2014-09-23 2015-07-23 Machine-outil electrique dotee d'un element de commutation a actionnement manuel Not-in-force EP3000562B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014219192.0A DE102014219192A1 (de) 2014-09-23 2014-09-23 Elektrowerkzeugmaschine mit einem manuell betätigbaren Schalterelement

Publications (2)

Publication Number Publication Date
EP3000562A1 true EP3000562A1 (fr) 2016-03-30
EP3000562B1 EP3000562B1 (fr) 2017-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15178036.8A Not-in-force EP3000562B1 (fr) 2014-09-23 2015-07-23 Machine-outil electrique dotee d'un element de commutation a actionnement manuel

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EP (1) EP3000562B1 (fr)
DE (1) DE102014219192A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3812089A1 (fr) 2019-10-23 2021-04-28 Black & Decker Inc. Ponceuse à manche
US11867224B2 (en) 2021-01-27 2024-01-09 Black & Decker Inc. Locking mechanism for two telescoping poles of a power tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841126A2 (fr) * 1996-11-11 1998-05-13 HILTI Aktiengesellschaft Appareil à main entraîné par moteur avec un dispositif de sécurité dans la cas d'outil de blocage
WO2004024398A1 (fr) * 2002-09-13 2004-03-25 Black & Decker Inc Outil tournant
CN101882523A (zh) 2009-05-08 2010-11-10 浙江佳奔电子有限公司 带停电重启保护功能的扳机开关
EP2641698A2 (fr) * 2012-03-23 2013-09-25 Etablissements Georges Renault Outil motorisé comprenant des moyens de rappel exerçant sur les moyens d'actionnement un effort de rappel décroissant lorsque ces moyens d'actionnement sont déplacés vers leur position d'activation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841126A2 (fr) * 1996-11-11 1998-05-13 HILTI Aktiengesellschaft Appareil à main entraîné par moteur avec un dispositif de sécurité dans la cas d'outil de blocage
WO2004024398A1 (fr) * 2002-09-13 2004-03-25 Black & Decker Inc Outil tournant
CN101882523A (zh) 2009-05-08 2010-11-10 浙江佳奔电子有限公司 带停电重启保护功能的扳机开关
EP2641698A2 (fr) * 2012-03-23 2013-09-25 Etablissements Georges Renault Outil motorisé comprenant des moyens de rappel exerçant sur les moyens d'actionnement un effort de rappel décroissant lorsque ces moyens d'actionnement sont déplacés vers leur position d'activation

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Publication number Publication date
DE102014219192A1 (de) 2016-03-24
EP3000562B1 (fr) 2017-06-21

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