EP3000562A1 - Electric machine tool with a manually actuated switch element - Google Patents
Electric machine tool with a manually actuated switch element Download PDFInfo
- 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
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- EP
- European Patent Office
- Prior art keywords
- drive motor
- switch element
- magnetic core
- tool housing
- electric machine
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- 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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Abstract
Bei einer Elektrowerkzeugmaschine (10) mit einer Werkzeugaufnahme (20) und einem Werkzeuggehäuse (24), in dem ein Antriebsmotor (12) zum Antrieb der Werkzeugaufnahme (20) angeordnet ist und an dem ein manuell betätigbares Schalterelement (30) zur Betätigung eines dem Antriebsmotor (12) zugeordneten, elektrischen Ein-/Aus-Schalters (40) angeordnet ist, wobei ein Elektromagnet (100) zur mechanischen Arretierung des manuell betätigbaren Schalterelements (30) im bestromten Zustand des Antriebsmotors (12) vorgesehen ist, ist der Elektromagnet (100) im Motorstromkreis des Antriebsmotors (12) angeordnet und weist einen Magnetkern (102) auf, der im bestromten Zustand des Antriebsmotors (12) durch mindestens eine elektrische Leitung (104) magnetisch erregt wird, die dem Antriebsmotor (12) zugeordnet ist.In a power tool (10) with a tool holder (20) and a tool housing (24) in which a drive motor (12) for driving the tool holder (20) is arranged and on which a manually operable switch element (30) for actuating a drive motor (12) associated with, electrical on / off switch (40) is arranged, wherein an electromagnet (100) for mechanically locking the manually operable switch element (30) is provided in the energized state of the drive motor (12), the electromagnet (100 ) in the motor circuit of the drive motor (12) and has a magnetic core (102) which is magnetically excited in the energized state of the drive motor (12) by at least one electrical line (104) which is associated with the drive motor (12).
Description
Die vorliegende Erfindung betrifft eine Elektrowerkzeugmaschine mit einer Werkzeugaufnahme und einem Werkzeuggehäuse, in dem ein Antriebsmotor zum Antrieb der Werkzeugaufnahme angeordnet ist und an dem ein manuell betätigbares Schalterelement zur Betätigung eines dem Antriebsmotor zugeordneten, elektrischen Ein-/Aus-Schalters angeordnet ist, wobei ein Elektromagnet zur mechanischen Arretierung des manuell betätigbaren Schalterelements im bestromten Zustand des Antriebsmotors vorgesehen ist.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.
Aus dem Stand der Technik sind derartige Elektrowerkzeugmaschinen bekannt, die z.B. nach Art von Winkelschleifern ausgebildet sind und als manuell betätigbare Schalterelemente Schiebeschalter zum Ein- und Ausschalten eines zugeordneten Antriebsmotors aufweisen. Damit die Schiebeschalter im Dauerbetrieb der Elektrowerkzeugmaschinen nicht permanent betätigt werden müssen, sind diese zur komfortablen Handhabung durch einen Benutzer im Einschaltzustand z.B. mechanisch arretierbar. Derartige mechanisch arretierbare Schiebeschalter können dazu ausgebildet sein, beim Wegfall einer entsprechenden Versorgungsspannung des Antriebsmotors, wie z.B. beim Ziehen des Netzsteckers der Elektrowerkzeugmaschine oder beim Ansprechen einer Überstromsicherung in einer lokalen Wechselstromverteilung, sich unter Zuhilfenahme von elektromagnetischen Aktuatoren selbsttätig in den sicheren Ausschaltzustand zu versetzen.From the prior art 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. In order that 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.
Beispielsweise beschreibt die
Nachteilig am Stand der Technik ist, dass dieser elektrische Ein-/Aus-Schalter zur magnetischen Arretierung einen vollständigen Elektromagneten als eigenständige und somit komplex aufgebaute Baugruppe erfordert, was zu einer Erhöhung entsprechender Fertigungskosten führt.A disadvantage of the prior art is that this electrical on / off switch for magnetic locking requires a complete electromagnet as an independent and thus complex assembly, which leads to an increase in corresponding manufacturing costs.
Aufgabe der Erfindung ist es daher, eine neue Elektrowerkzeugmaschine bereitzustellen, die ein kostengünstig realisierbares, manuell betätigbares sowie mechanisch und elektromagnetisch arretierbares Schalterelement aufweist.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.
Dieses Problem wird gelöst durch eine Elektrowerkzeugmaschine mit einer Werkzeugaufnahme und einem Werkzeuggehäuse, in dem ein Antriebsmotor zum Antrieb der Werkzeugaufnahme angeordnet ist und an dem ein manuell betätigbares Schalterelement zur Betätigung eines dem Antriebsmotor zugeordneten, elektrischen Ein-/Aus-Schalters angeordnet ist. Ein Elektromagnet ist zur mechanischen Arretierung des manuell betätigbaren Schalterelements im bestromten Zustand des Antriebsmotors vorgesehen. Der Elektromagnet ist im Motorstromkreis des Antriebsmotors angeordnet und weist einen Magnetkern auf, der im bestromten Zustand des Antriebsmotors durch mindestens eine elektrische Leitung magnetisch erregt wird, die dem Antriebsmotor zugeordnet ist.This problem is solved by 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.
Die Erfindung ermöglicht somit die Bereitstellung einer Elektrowerkzeugmaschine, bei der durch das Einschleifen des Elektromagneten in den Motorstromkreis der konstruktive Aufbau bei einer gleichzeitigen Kostenreduktion vereinfacht ist, da kein vollständiger Elektromagnet als separate Komponente zur mechanischen Arretierung des Schalterelements im bestromten Zustand des Antriebsmotors notwendig ist. Hierbei können zur technischen Umsetzung eines zur mechanischen bzw. elektromechanischen Arretierung des Schalterelements vorgesehenen Elektromagneten ohnehin für die Elektrowerkzeugmaschine notwendige Baugruppen, insbesondere eine Motonivicklung sowie mindestens eine Versorgungsleitung des Antriebsmotors mitbenutzt werden.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. In this case, for the technical implementation of an electromagnet provided for mechanical or electromechanical locking of the switch element, 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.
Gemäß einer Ausführungsform bildet die mindestens eine elektrische Leitung zumindest abschnittsweise eine Motorwicklung des Antriebsmotors oder eine Versorgungsleitung zum Antriebsmotor aus, die den Magnetkern zumindest abschnittsweise umgreift.According to one embodiment, 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.
Bei der Mitbenutzung der Motorwicklung des Antriebsmotors bzw. einer diesem zugeordneten Versorgungsleitung verringert sich die Anzahl der für den Elektromagneten notwendigen Einzelkomponenten. Bei der Mitbenutzung der Versorgungsleitung ergibt sich gleichfalls ein konstruktiv erheblich vereinfachter Aufbau, da eine ohnehin vorhandene elektrische Zuleitung zwischen dem elektrischen Ein-/Aus-Schalter und dem Antriebsmotor zugleich zur magnetischen Erregung des Magnetkerns dient.When the motor winding of the drive motor or a supply line assigned to it is used together, the number of individual components required for the electromagnet is reduced. When sharing the supply line also results in a structurally considerably simplified structure, since an already existing electrical supply line between the electrical on / off switch and the drive motor also serves for magnetic excitation of the magnetic core.
Vorzugsweise ist das manuell betätigbare Schalterelement verschiebbar und verschwenkbar am Werkzeuggehäuse aufgenommen und mittels eines Schiebeglieds mit dem elektrischen Ein-/Aus-Schalter gekoppelt.Preferably, 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.
Hierdurch ist eine räumliche Trennung zwischen dem nach Art eines Schiebeschalters ausgebildeten Schalterelement und dem elektrischen Ein-/Aus-Schalter realisierbar, so dass dieser z. B. in einem von der Werkzeugaufnahme abgewandten, hinteren Endabschnitt des Werkzeuggehäuses im Bereich einer Netzleitung der Elektrowerkzeugmaschine positioniert werden kann. Ein Betätigungsstößel des elektrischen Ein-/Aus-Schalters verläuft bei dieser Ausführungsform bevorzugt in etwa parallel zur Längsachse des Werkzeuggehäuses und wird indirekt mittels des Schiebeglieds vom Schiebeschalter angesteuert.As a result, a spatial separation between the manner of a slide switch switch element and the electrical on / off switch can be realized, so that this z. B. in a remote from the tool holder, rear end portion of the tool housing in the region of a power line of the power tool can be positioned. An actuating tappet of the electrical on / off switch in this embodiment preferably extends approximately parallel to the longitudinal axis of the tool housing and is controlled indirectly by means of the sliding member from the slide switch.
Bevorzugt ist eine mit einem Stößel versehene Wippe verschwenkbar am Magnetkern angelenkt und mittels eines Federglieds derart in Richtung des Werkzeuggehäuses vorgespannt, dass der Stößel im unbestromten Zustand des Antriebsmotors zumindest bereichsweise in eine Halteöffnung des Werkzeuggehäuses eingreift.Preferably, 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.
Hierdurch wird eine jeweilige Arretierung des Schalterelements z.B. bei Unterbrechung der Stromzufuhr zum Antriebsmotor selbsttätig aufgrund der Federkraft des Federglieds gelöst.This will cause a respective locking of the switch element e.g. when the power supply to the drive motor is interrupted automatically due to the spring force of the spring member.
Vorzugsweise weist das manuell betätigbare Schalterelement ein Halteglied zur Arretierung am Werkzeuggehäuse im Arretierbetrieb des Elektromagneten auf.Preferably, the manually operable switch element has a holding member for locking on the tool housing in the locking operation of the electromagnet.
Hierdurch kann der Benutzer das manuell betätigbare Schalterelement im bestromten Zustand des Antriebsmotors freigeben, um ein ermüdungsfreies Arbeiten im Dauerbetrieb der Elektrowerkzeugmaschine zu ermöglichen.This allows the user to release the manually operable switch element in the energized state of the drive motor to allow fatigue-free working in continuous operation of the power tool.
Gemäß einer Ausführungsform ist das Halteglied im unbestromten Zustand des Antriebsmotors mittels des Stößels der federnd vorgespannten Wippe aus der Halteöffnung herausstoßbar.According to one embodiment, the holding member in the de-energized state of the drive motor by means of the plunger of the resiliently biased rocker from the holding opening herausstoßbar.
Hierdurch schaltet sich der Antriebsmotor im Fall einer Unterbrechung der Stromzufuhr des Antriebsmotors zur Erhöhung der Arbeitssicherheit unverzüglich selbsttätig ab. Ein Wiedereinschalten ist hierbei nur durch eine aktive Benutzerhandlung bei wiederkehrender Stromzufuhr zum Motorstromkreis möglich.As a result, 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.
Bevorzugt ist der Magnetkern geblecht und mit einer Kurzschlusswicklung versehen.Preferably, the magnetic core is laminated and provided with a short-circuit winding.
Hierdurch wird ein Wechselstrombetrieb des Elektromagneten ermöglicht. Anstatt der Kurzschlusswicklung zur Erzeugung einer Phasenverschiebung zwischen dem Magnetfeld und dem Strom kann eine Gleichrichterschaltung mit in die Motonivicklung integriert werden, die einen gleichgerichteten Strom im entsprechenden Wicklungsabschnitt erzeugt und somit eine permanente magnetische Kraft ohne Kraftnulldurchgänge ermöglicht.As a result, an AC operation of the electromagnet is made possible. Instead of the short-circuit winding for generating a phase shift between the magnetic field and the current, 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.
Gemäß einer Ausführungsform ist der Magnetkern zumindest annähernd parallel und/oder koaxial zur Längsachse des Werkzeuggehäuses angeordnet und das manuell betätigbare Schalterelement am elektrischen Ein-/Aus-Schalter und/oder am Werkzeuggehäuse ist derart verschiebbar und verschwenkbar angeordnet, dass der elektrische Ein-/Aus-Schalter zum Ein- und Ausschalten des Antriebsmotors mittels einer am Schalterelement ausgebildeten Anlaufkontur betätigbar ist.According to one embodiment, 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.
Infolge des bei dieser Ausführungsform nicht erforderlichen Schiebeglieds ergibt sich ein kompakter Aufbau der Schaltmimik. Diese Ausführungsform ist insbesondere für Elektrowerkzeugmaschinen mit einem im Wesentlichen stabförmigen Werkzeuggehäuse geeignet, dessen Durchmesser so groß ist, dass das Werkzeuggehäuse vom Benutzer nicht mehr vollständig mit einer Hand umgriffen werden kann. Bei dieser Ausführungsform ist das Schalterelement bevorzugt in einem von der Werkzeugaufnahme abgewandten, hinteren, z.B. Netzleitungsseitigen Endabschnitt des Werkzeuggehäuses angeordnet, wobei ein Betätigungsstößel des elektrischen Ein-/Aus-Schalters orthogonal zur Längsachse des Werkzeuggehäuses verläuft und direkt vom manuell betätigbaren Schalterelement betätigt wird.As a result of the sliding member not required in this embodiment, a compact construction of the switching mimic results. This embodiment is particularly suitable for power tools with a substantially rod-shaped tool housing whose diameter is so large that the tool housing can no longer be fully grasped by the user with one hand. In this embodiment, 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.
Vorzugsweise ist der Magnetkern mittels einer Feder in Richtung einer Halteöffnung des Werkzeuggehäuses axial vorgespannt und an dem Magnetkern ist ein Stößel ausgebildet, der dazu ausgebildet ist, im unbestromten Zustand des Antriebsmotors zumindest bereichsweise in die Halteöffnung des Werkzeuggehäuses einzugreifen.Preferably, 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.
Hierdurch ist im stromlosen Zustand des Motorkreises die Entriegelung des Schalterelements gewährleistet.As a result, the unlocking of the switch element is ensured in the de-energized state of the motor circuit.
Bevorzugt ist am manuell betätigbaren Schalterelement ein Halteglied ausgebildet, das im bestromten Zustand des Antriebsmotors und bei zurückgezogenem Stößel in der Halteöffnung des Werkzeuggehäuses gehalten ist.Preferably, 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.
Hierdurch ist eine zuverlässige, insbesondere vibrations- und erschütterungsfeste, mechanische Arretierung des manuell betätigbaren Schalterelements gegeben.In this way, a reliable, in particular vibration and vibration resistant, mechanical locking of the manually operable switch element is given.
Vorzugsweise ist das Halteglied im unbestromten Zustand des Antriebsmotors mittels des Stößels aus der Halteöffnung herausstoßbar.Preferably, the holding member in the de-energized state of the drive motor by means of the plunger from the holding opening herausstoßbar.
Hierdurch wird die mechanische Verriegelung zwischen der Halteöffnung im Werkzeuggehäuse und dem Halteglied des Schalterelements bei einer Stromunterbrechung im Motorstromkreis zur Gewährleistung einer hohen Arbeitssicherheit selbsttätig und unverzüglich aufgehoben.As a result, the mechanical locking between the holding opening in the tool housing and the holding member of the switch element is automatically and immediately canceled at a power interruption in the motor circuit to ensure a high level of safety.
Bevorzugt ist der Magnetkern geblecht und mit einer Kurzschlusswicklung versehen.Preferably, the magnetic core is laminated and provided with a short-circuit winding.
Hierdurch wird ebenfalls ein problemloser Wechselstrombetrieb des Elektromagneten ermöglicht.As a result, a trouble-free AC operation of the electromagnet is also possible.
Die Erfindung ist anhand von in den Zeichnungen dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1
- eine Schnittansicht einer Elektrowerkzeugmaschine mit einer ersten Ausführungsform eines Elektromagneten,
- Fig. 2, 3
- einen vergrößerten Ausschnitt II von
Fig. 1 mit einem Schalterelement in einer Ausschaltstellung und in einer Einschaltstellung, - Fig. 4
- eine perspektivische Ansicht eines Magnetkerns des Elektromagneten von
Fig. 1 bis Fig. 3 mit einer Kurzschlusswicklung, - Fig. 5, 6
- eine schematische Ansicht einer zweiten Ausführungsform eines Elektromagneten mit einem Schalterelement in einer Ausschaltstellung und in einer Einschaltstellung,
- Fig. 7
- eine perspektivische Ansicht des Magnetkerns des Elektromagneten von
Fig. 5 und Fig. 6 mit einer Kurzschlusswicklung, und - Fig. 8
- eine schematische Ansicht einer dritten Ausführungsform eines Elektromagneten mit dem Schalterelement von
Fig. 5 und Fig. 6 in der Ausschaltstellung.
- Fig. 1
- a sectional view of a power tool with a first embodiment of an electromagnet,
- Fig. 2, 3rd
- an enlarged section II of
Fig. 1 with a switch element in an open position and in a closed position, - Fig. 4
- a perspective view of a magnetic core of the electromagnet of
Fig. 1 to Fig. 3 with a short-circuit winding, - Fig. 5, 6
- a schematic view of a second embodiment of an electromagnet with a switch element in an open position and in a closed position,
- Fig. 7
- a perspective view of the magnetic core of the electromagnet of
Fig. 5 and Fig. 6 with a short circuit winding, and - Fig. 8
- a schematic view of a third embodiment of an electromagnet with the switch element of
Fig. 5 and Fig. 6 in the off position.
Das Werkzeuggehäuse 24 ist bevorzugt stabförmig ausgebildet. An einem von der Werkzeugaufnahme 20 weggerichteten, hinteren Endabschnitt 42 des Werkzeuggehäuses 24 ist eine Netzleitung 44 zur Zuführung von Wechselstrom, z.B. aus einem öffentlichen Spannungsversorgungsnetz zum Antriebsmotor 12 in das Werkzeuggehäuse 24 eingeführt. Die Stromzufuhr für den Antriebsmotor 12 ist hier lediglich beispielhaft mittels der Netzleitung 44 über das öffentliche Spannungsversorgungsnetz verwirklicht, kann alternativ hierzu oder ergänzend aber auch mit einem oder mehreren der Elektrowerkzeugmaschine 10 zugeordneten Akkupacks erfolgen. Es sei noch darauf hingewiesen, dass Funktionsweise und Aufbau eines geeigneten Antriebsmotors bzw. eines geeigneten Winkelschleifers dem Fachmann hinreichend aus dem Stand der Technik bekannt sind. Deshalb wird hier zwecks Einfachheit und Knappheit der Beschreibung auf eine weitere Beschreibung hiervon verzichtet.The
Das manuell betätigbare Schalterelement 30 ist vorzugsweise über ein parallel zu einer Längsachse 32 des Werkzeuggehäuses 24 verschiebbares Schiebeglied 34 mit einem Betätigungsstößel 36 eines mit einem Schaltergehäuse 46 versehenen, elektrischen Ein-/Aus-Schalters 40 gekoppelt. Der Betätigungsstößel 36 ist bevorzugt mittels einer z.B. in das Schaltergehäuse 46 integrierten Druckfeder 48 axial vorgespannt. Zum Schließen elektrischer Schaltkontakte 50, 52 des elektrischen Ein-/Aus-Schalters 40 und zum Bestromen des Antriebsmotors 12 muss der Betätigungsstößel 36 demzufolge entgegen der Federwirkung der Druckfeder 48 mittels des Schiebeglieds 34 parallel zur Längsachse 32 zumindest teilweise in das Schaltergehäuse 46 des elektrischen Ein-/Aus-Schalters 40 eingedrückt werden. An dem manuell vom Benutzer betätigbaren Schalterelement 30 ist unterseitig ein dem Werkzeuggehäuse 24 zugewandtes, beispielhaft quaderförmiges Halteglied 38 ausgebildet.The manually
Diese erste Ausführungsform eines Elektromagneten 100 verfügt über einen U-förmigen Magnetkern 102, der bei bestromtem Antriebsmotor 12 durch dessen mit einer elektrischen Leitung 104 gewickelten Motorwicklung 106 magnetisch erregt wird. Zu diesem Zweck ist der Magnetkern 102 zumindest abschnittsweise von der Motorwicklung 106 bzw. der Leitung 104 umschlossen. An den U-förmigen Magnetkern 102 ist bevorzugt eine mit einem Stößel 108 versehene Wippe 110 angelenkt, die mittels eines Federglieds 112 derart in Richtung des Werkzeuggehäuses 24 vorgespannt ist, dass der Stößel 108 im unbestromten Zustand des Antriebsmotors 12 aufgrund der Kraftwirkung des Federglieds 112 zumindest bereichsweise in eine Halteöffnung 114 des Werkzeuggehäuses 24 eingreift.This first embodiment of an
Im bestromten Zustand des Antriebsmotors 12 ist das Halteglied 38 - aufgrund des dann vom gleichfalls bestromten Elektromagneten 100 vollständig zurückgezogenen Stößels 108 der Wippe 110 - zumindest bereichsweise in die korrespondierend ausgestaltete Halteöffnung 114 einbringbar, so dass der Antriebsmotor 12 auch bei einer Freigabe des Schalterelements 30 durch einen Benutzer weiterläuft, um einen komfortablen Dauerbetrieb der Elektrowerkzeugmaschine 10 zu ermöglichen. Das Halteglied 38 des Schalterelements 34 hakt sich hierbei aufgrund der in Richtung des hinteren Endabschnitts 42 gerichteten und auf den Betätigungsstößel 36 des elektrischen Ein-/Aus-Schalters 40 wirkenden Federkraft der Druckfeder 48 in der Halteöffnung 114 des Werkzeuggehäuses 24 mechanisch fest. Tritt eine Unterbrechung der Stromzufuhr, z.B. durch das Trennen der Netzleitung oder das Ansprechen einer Sicherung auf, so geht der Elektromagnet 100 in den unbestromten bzw. unmagnetisierten Zustand über und wird damit unmagnetisch, so dass der Stößel 108 der Wippe 110 aufgrund der Kraftwirkung des Federglieds 112 das Halteglied 38 aus der Halteöffnung 114 herausstößt und das Schalterelement 30 aufgrund der Kraftwirkung der Druckfeder 48 des elektrischen Ein-/Aus-Schalters 40 selbsttätig und unverzüglich in seine in
Um das Hereingleiten des Halteglieds 38 in die Halteöffnung 114 zu erleichtern bzw. das Ausstoßen des Halteglieds 38 mittels des Stößels 108 zu unterstützen, verfügt die Halteöffnung 114 an einer beispielhaft zum hinteren Endabschnitt 42 des Werkzeuggehäuses 24 weisenden Wandung 130 über eine Fase 132. Im Fall einer Stromunterbrechung wird die Motorwicklung 106 stromlos bzw. geht in den stromlosen Zustand über, wodurch zugleich die Magnetisierung des Magnetkerns 102 des Elektromagneten 100 fortfällt. Hierdurch wird die Wippe 110 aufgrund der Kraftwirkung des Federglieds 112 unverzüglich und selbsttätig vom Magnetkern 102 abgehoben und der an ihr ausgebildete Stößel 108 schiebt das Halteglied 38 des Schalterelements 30 aus der Halteöffnung 114 heraus, so dass der axial federnd vorgespannte Betätigungsstößel 36 des elektrischen Ein-/AusSchalters 40 das Schalterelement 30 mittels des Schiebeglieds 34 in Richtung des hinteren Endabschnitts 42 des Werkzeuggehäuses 24 zurückziehen kann, bis die Ausschaltstellung des Schalterelements 30 von
Der zylindrische Magnetkern 202 verfügt bevorzugt über einen scheibenförmigen Anschlag 206 zur axialen Wegbegrenzung, der im unbestromten Zustand bzw. im nicht magnetisierten Zustand des Magnetkerns 202 am Werkzeuggehäuse 24 anliegt. Der zylindrische Magnetkern 202 setzt sich vorzugsweise in Richtung des hinteren Endabschnitts 42 des Werkzeuggehäuses 24 in einem Stößel 208 fort, der illustrativ einen im Vergleich zu einem Durchmesser des Magnetkerns 202 deutlich reduzierten Durchmesser aufweist. Der Stößel 208 ragt im unbestromten bzw. nicht magnetisierten Zustand des Magnetkerns 202 aufgrund der Kraftwirkung der Feder 204 zumindest bereichsweise in eine Halteöffnung 210 des Werkzeuggehäuses 24 hinein.The cylindrical
Im hinteren Endabschnitt 42 des Werkzeuggehäuses 24 befindet sich wiederum die Netzleitung 44, die elektrisch leitend mit einem elektrischen Ein-/Aus-Schalter 212 verbunden ist. Dieser verfügt bevorzugt über einen Betätigungsstößel 214, der als ein weiterer Unterschied zur ersten Ausführungsform zum Schließen und Öffnen von zwei elektrischen Schaltkontakten 216, 218 vorzugsweise zumindest im Wesentlichen quer zu der Längsachse 32 betätigbar ist und der mittels einer Druckfeder 220 axial vorgespannt ist. Die beiden Schaltkontakte 216, 218 schließen bevorzugt, wenn der Betätigungsstößel 214 entgegen der Kraftwirkung der Druckfeder 220 in Richtung eines Schaltergehäuses 222 zumindest abschnittsweise in dieses eingedrückt wird.In the
Ein manuell betätigbares Schalterelement 230 ist vorzugsweise mittels eines Langlochs 232 und eines darin aufgenommenen Zapfens 234 verschwenkbar sowie verschiebbar an dem Schaltergehäuse 222 bzw. dem Werkzeuggehäuse 24 gelagert. Das Schalterelement 230 kann somit parallel zur Längsachse 32 des Werkzeuggehäuses 24 eine Verschiebebewegung und in Bezug zu dieser eine geringfügige Verschwenkbewegung vollziehen. Der Zapfen 234 kann - wie hier exemplarisch gezeigt - am Schaltergehäuse 222 oder am Werkzeuggehäuse 24 ausgeformt sein. An einem von dem Langloch 232 weggerichteten Ende verfügt das Schalterelement 230 bevorzugt über ein zapfenförmiges Halteglied 236, das in der Einschaltstellung des Schalterelements 230 (vgl.
Die illustrativ als Schließer ausgebildeten, d.h. die unbetätigt offenen elektrischen Schaltkontakte 216, 218 des elektrischen Ein-/Aus-Schalters 212, sind an jeweils eine dem Motorstromkreis zugeordnete elektrische Leitung 244, 246 angeschlossen, die jeweils über eine zugeordnete Versorgungsleitung 248, 250 mit dem Antriebsmotor 12 verbunden sind, z.B. mit der Motonivicklung 106 von
Erfindungsgemäß umschließt zumindest die eine im Bereich des Magnetkerns 202 vorzugsweise wendeiförmig verlaufende elektrische Leitung 246 den Magnetkern 202 des Elektromagneten 200 zur Ausbildung einer zylindrischen Wicklung 252 mit einer Vielzahl von Windungen 254 derart, dass dieser beim Stromdurchgang durch die Leitung 246 im Gegensatz zur ersten Ausführungsform über diese Leitung 246 magnetisch erregt bzw. magnetisiert wird. Da die ohnehin zur Stromversorgung des Antriebsmotors 12 notwendige und dem Motorstromkreis zugeordnete elektrische Leitung 246 zugleich die Wicklung 252 zur magnetischen Erregung des Elektromagneten 200 in der Einschaltstellung des Schalterelements 230 ausbildet, kann dieser mit einem reduzierten Bauteil- und Kostenaufwand realisiert werden.According to the invention, at least one of the
In
Die in
Tritt in der Einschaltstellung des Schalterelements 230 von
Entsprechend verhält es sich, wenn der Benutzer das Schalterelement 230 zur Beendigung des Dauerbetriebs der Elektrowerkzeugmaschine 10 von
An der Wippe 306 ist bevorzugt ein vom Magnetkern 302 weggerichteter Stößel 310 ausgebildet. Die Wippe 306 ist vorzugsweise mittels eines Federglieds 312-das sich zwischen dem Werkzeuggehäuse 24 und der Wippe 306 abstützt - in Richtung der Halteöffnung 210 im Werkzeuggehäuse 24 von
In
Die hier gezeigte dritte Ausführungsform des Elektromagneten 300 entspricht im Übrigen hinsichtlich ihres konstruktiven Aufbaus sowie ihrer Funktionsweise der zweiten Ausführungsform nach Maßgabe der
Es sei noch darauf hingewiesen, dass im Kontext der vorliegenden Erfindung der Begriff "Motorstromkreis" alle Leitungen umfasst, die zur Bestromung des Antriebsmotors 12 von
Claims (12)
Applications Claiming Priority (1)
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DE102014219192.0A DE102014219192A1 (en) | 2014-09-23 | 2014-09-23 | Electric machine tool with a manually operable switch element |
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EP3000562A1 true EP3000562A1 (en) | 2016-03-30 |
EP3000562B1 EP3000562B1 (en) | 2017-06-21 |
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EP15178036.8A Not-in-force EP3000562B1 (en) | 2014-09-23 | 2015-07-23 | Electric machine tool with a manually actuated switch element |
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DE (1) | DE102014219192A1 (en) |
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EP3812089A1 (en) | 2019-10-23 | 2021-04-28 | Black & Decker Inc. | Pole sander |
US11867224B2 (en) | 2021-01-27 | 2024-01-09 | Black & Decker Inc. | Locking mechanism for two telescoping poles of a power tool |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0841126A2 (en) * | 1996-11-11 | 1998-05-13 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
WO2004024398A1 (en) * | 2002-09-13 | 2004-03-25 | Black & Decker Inc | Rotary tool |
CN101882523A (en) | 2009-05-08 | 2010-11-10 | 浙江佳奔电子有限公司 | Trigger switch with power failure restart protection function |
EP2641698A2 (en) * | 2012-03-23 | 2013-09-25 | Etablissements Georges Renault | Power tool comprising a return means exerting a decreasing return effort on the actuation means when said actuation means is moved into the active position thereof |
-
2014
- 2014-09-23 DE DE102014219192.0A patent/DE102014219192A1/en not_active Withdrawn
-
2015
- 2015-07-23 EP EP15178036.8A patent/EP3000562B1/en not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0841126A2 (en) * | 1996-11-11 | 1998-05-13 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
WO2004024398A1 (en) * | 2002-09-13 | 2004-03-25 | Black & Decker Inc | Rotary tool |
CN101882523A (en) | 2009-05-08 | 2010-11-10 | 浙江佳奔电子有限公司 | Trigger switch with power failure restart protection function |
EP2641698A2 (en) * | 2012-03-23 | 2013-09-25 | Etablissements Georges Renault | Power tool comprising a return means exerting a decreasing return effort on the actuation means when said actuation means is moved into the active position thereof |
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DE102014219192A1 (en) | 2016-03-24 |
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