EP1684949B1 - Portable power tool - Google Patents

Portable power tool Download PDF

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Publication number
EP1684949B1
EP1684949B1 EP04786863A EP04786863A EP1684949B1 EP 1684949 B1 EP1684949 B1 EP 1684949B1 EP 04786863 A EP04786863 A EP 04786863A EP 04786863 A EP04786863 A EP 04786863A EP 1684949 B1 EP1684949 B1 EP 1684949B1
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EP
European Patent Office
Prior art keywords
power tool
portable power
switching
tool according
blocking
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.)
Expired - Fee Related
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EP04786863A
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German (de)
French (fr)
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EP1684949A1 (en
Inventor
Gerhard Meixner
Markus Leupert
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1684949A1 publication Critical patent/EP1684949A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION 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
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • An uncontrollable blocking case of a hand tool is when the plug-in tool jams in the workpiece to be machined, the reaction torque acting on the housing exceeds a holding force of an operator and the housing rotates uncontrollably at a certain angular velocity and over a certain angular range about an axis. If the holding force of the operator is greater than the present reaction torque or if the operator holds the power tool during a blocking case, there is a so-called controllable blocking case.
  • German Offenlegungsschrift DE 37 07 052 A1 discloses a hand tool machine with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder can be driven in rotation.
  • the hand tool has a protective device with which a so-called uncontrollable blocking case of the insert tool can be detected via a sensor.
  • the rotary drive is interrupted by a clutch disposed in the drive train is automatically disengaged in response to an overload size, whereby the housing is blocked in its movement. By manually pressing an engagement plate, the clutch can be mechanically re-engaged directly by the engagement plate with a lever compresses a release spring of the clutch.
  • the invention is based on a hand tool with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder can be driven in rotation, and with a protective device with which a sensor unit uncontrollable blocking case of the insert tool recognizable and the housing is blockable in its movement, wherein the protective device comprises a mechanical unlocking unit, which is manually actuated by an operating force of an operator.
  • a transmission via an on / off means for actuating the unlocking unit is actuated.
  • the unlocking unit can be reliably solved when switching on the electric motor.
  • the operating force of the operator unlocks the protection device.
  • the unlocking therefore requires no complex electronic components and is particularly fail-safe.
  • mechanical components are inexpensive and do not require electrical power.
  • the protective device can be triggered in an uncontrollable blocking case and reset without special effort when switching on the power tool and re-activated. Compared to electrical or electronic systems, the function of the protection device is considerably simplified.
  • the mechanically actuatable unlocking unit can be combined with mechanical, electrical and electronic variants of sensor units and / or blocking units of a protective device.
  • the transmission may preferably be designed as a cam gear.
  • a lever mechanism may be provided or another, the expert appear appropriate gear.
  • the on / off means is designed as a pawl, which is actuated by the operator for switching on and off of the power tool.
  • the on / off means may be integrated into the hand tool so that it is triggered when pressing the tool or the power tool to a working surface.
  • the unlocking unit is automatically actuated when switching on the electric motor via the on / off means. Then the protection device can be reactivated without further action by the operator and is ready for immediate use. It is ensured that the electric motor only starts when the unlocking unit is released and the protective device is ready for use again.
  • the protective device of the power tool is easy to use.
  • the protective device comprises a mechanical sensor unit, this results in a further simplification of the system and a reduced susceptibility to interference.
  • the sensor unit has a return spring, which automatically re-activates and makes ready the sensor unit even after a blocking event when switching on the power tool.
  • the protective device comprises an electrical sensor unit. This allows the use of intelligent sensors in a mixed mechanical-electrical system with a purely mechanical so-called reset and an electrical sensor unit.
  • the protection device comprises a mechanical blocking unit
  • a purely mechanical protection device can be shown that works very reliably and allows a high level of operational safety.
  • the blocking unit has a rotatably mounted latching lever with a toothing provided for engagement in a blocking toothing at one end and an extension at the opposite end.
  • the blocking teeth can block a rotation of the housing in uncontrollable blocking case.
  • the protection device comprises an electrical blocking unit. This allows a structure of a mixed mechanical-electrical system with a purely mechanical so-called reset and an electrical blocking unit.
  • the unlocking unit has a switching rod whose one end is connected to an on / off means and whose other end is in operative connection with the blocking unit, the blocking unit can be actuated via the unlocking unit.
  • the shift rod is mounted longitudinally displaceable along the axis of rotation.
  • a movement of the on / off means in the longitudinal direction can be utilized for the actuation of the shift rod.
  • the shift rod on a switching lug and a switching cam whereby a triggered by an actuation of the on / off means movement in the longitudinal direction in an up-down movement with a first upper position and a second lower position can be implemented.
  • the shift rod With the up-down movement, the shift rod can occupy at least two different operating states for a case of blocking and unlocking the protection device.
  • the shift rod engages at one end with an actuating pin on the on / off means and at the other end with a connecting part in the extension of the locking lever.
  • the shift rod is in the upper position.
  • the shift rod assumes a neutral position, which remains without effect on the power tool. If a blocking case has occurred, this can also be maintained when releasing the on / off means and when switching off the electric motor.
  • Is when operating the on / off means the shift rod in the lower position movable and the locking lever from the blocking toothing, the locking teeth is unlocked without further action by the operator when switching on the electric motor and the protection device activated again.
  • the protection device is reset and activated, and then, when the movement is continued, the electric motor is switched on electrically. This ensures that the electric motor always runs only when the protection device is activated.
  • the coupling may be a mechanically or electrically operable coupling.
  • the electric motor and / or electrical components can be switched off in the event of a blockage, energy can be saved.
  • the electric motor is already switched off, and the operator can quickly put the hand tool machine back into operation. If the electric motor is switched off and an electric clutch is opened to interrupt the torque flow in the event of a lock, it can be ensured that the housing remains blocked in its movement.
  • Fig. 1 shows a hand tool with a arranged in a housing 10, not shown electric motor.
  • the electric motor drives a arranged in a tool holder 16 insert tool 12 rotating.
  • a protective device 54 With a trained as a pawl of an on-off switch on / off means 20 in a handle 18 of the power tool, a protective device 54 can be unlocked. If an uncontrollable blocking case occurs, there is a risk that the housing 10 will rotate about an axis of rotation 14.
  • an uncontrollable blocking case of the insertion tool 12 can be recognized via a sensor unit 22 and the housing 10 can be blocked in its movement; Preferably, the electric motor is switched off.
  • a preferred protection device 54 is shown in FIG.
  • a mechanical sensor unit 22 is operatively connected to a mechanical blocking unit 52.
  • a particularly preferred blocking unit 52 and the sensor unit 22 are described in the published patent application DE 43 00 021, the disclosure of which is expressly incorporated by reference. If the sensor unit 22 detects an uncontrollable blocking event, the sensor unit 22 triggers and activates a blocking unit 52.
  • the blocking unit 52 comprises a latching lever 28 which is spring-mounted and rotatably mounted and has a blocking toothing 26 at one end.
  • the locking lever 28 can perform an up-down movement by the rotatable mounting.
  • a lateral support may be provided to prevent lateral deflection of the locking lever 28.
  • the locking lever 28 is between blocking teeth 26 and storage with the sensor unit 22 in contact.
  • the locking lever 28 is provided with an extension 30, in which an unlocking unit 50 engages.
  • the unlocking unit 50 comprises a switching rod 34, which is fastened on an end facing away from the extension 30 with an actuating pin 38 on the switching-pawl formed on / off-means 20 and longitudinally displaceable along the axis of rotation 14 (FIG. 1). is stored.
  • the shift rod 34 engages with a connecting part 32 in the extension 30 and through an opening in the extension 30 through.
  • a shift lug 36 and a shift cam 40 are provided, whereby a triggered by an operation of the pawl formed on / off means 20 longitudinal movement in an up-down movement with a first upper position and a second lower position is feasible.
  • the switching nose 36 and the switching cam 40 are shown in Fig. 4 in detail view.
  • the sensor unit 22 is shown in FIG. 3 in a detailed view. The principle of operation is described in DE 43 00 021 A1, the content of which is incorporated by reference.
  • the blocking unit 52 rests with the latching lever 28 attached to the detent pawl 46 on the circumference of a disc 42 and can engage with this in a recess 56.
  • the distance between locking lever 28 and disc 42 is different, depending on whether the latch 46 rests on the circumference or in the recess 56.
  • the lateral support 48 prevents lateral deflection. In the position shown, the distance is large, and the locking lever 28 is pressed by the latch 46 upwards. Turns the disc 42 upon detection of a blocking case to the left, the latch 46 engages in the recess 56 of the disc 42 a.
  • the detent lever 28 moves down and the locking teeth 26 are activated.
  • Resetting and activating the protection device 54 is carried out as follows: If an uncontrollable blocking case has occurred and the switching pawl on / off means 20 is still pressed by the operator, but the electric motor is already switched off and the operator tries to turn on the power tool, he must first let go of the switching pawl formed on / off means 20. The thus initiated on-movement of the shift rod 34 in the upper position has no effect. The operator now takes the hand tool in his hands and turns the Hand tool machine. By the beginning of the switch-on movement, the shift rod 34 is pressed by the switching cam 40 down and lifted the teeth of the locking lever 28 from the blocking teeth 26. The return spring 24 brings the sensor unit 22 back into the starting position, and the protective device 54 is ready for operation again.
  • the electric motor is switched on, and the working process of the handheld power tool is continued. If an uncontrollable blocking event occurs again immediately, the protective device 54 can react again immediately.
  • a preferred hand tool machine is in particular a hammer drill or a percussion drill.
  • the protective device 54 is also suitable for other power tool machines with rotationally drivable insert tools, for example, angle and eccentric grinders, circular saws, chain saws and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Sawing (AREA)
  • Portable Power Tools In General (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.

Ein unbeherrschbarer Blockierfall einer Handwerkzeugmaschine liegt vor, wenn sich das Einsteckwerkzeug im zu bearbeitenden Werkstück verklemmt, das am Gehäuse wirkende Reaktionsdrehmoment eine Haltekraft eines Bedieners übersteigt und das Gehäuse sich unkontrolliert mit einer bestimmten Winkelgeschwindigkeit und über einen bestimmten Winkelbereich um eine Achse dreht. Ist die Haltekraft des Bedieners größer als das vorliegende Reaktionsdrehmoment bzw. hält der Bediener die Handwerkzeugmaschine während eines Blockierfalls fest, liegt ein so genannter beherrschbarer Blockierfall vor.An uncontrollable blocking case of a hand tool is when the plug-in tool jams in the workpiece to be machined, the reaction torque acting on the housing exceeds a holding force of an operator and the housing rotates uncontrollably at a certain angular velocity and over a certain angular range about an axis. If the holding force of the operator is greater than the present reaction torque or if the operator holds the power tool during a blocking case, there is a so-called controllable blocking case.

Aus der Offenlegungsschrift DE 37 07 052 A1 ist eine Handwerkzeugmaschine mit einem in einem Gehäuse angeordneten Elektromotor bekannt, über den ein in einer Werkzeughalterung angeordnetes Einsatzwerkzeug rotierend antreibbar ist. Die Handwerkzeugmaschine besitzt eine Schutzvorrichtung, mit der über einen Sensor ein so genannter unbeherrschbarer Blockierfall des Einsatzwerkzeugs feststellbar ist. Der Drehantrieb wird unterbrochen, indem eine im Antriebsstrang angeordnete Kupplung in Abhängigkeit von einer Überlastgröße selbsttätig ausgerückt wird, womit das Gehäuse in seiner Bewegung blockierbar ist. Durch manuelles Eindrücken eines Einrückstellers kann die Kupplung unmittelbar mechanisch wieder eingerückt werden, indem der Einrücksteller mit einem Hebel eine Ausrückfeder der Kupplung zusammendrückt.German Offenlegungsschrift DE 37 07 052 A1 discloses a hand tool machine with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder can be driven in rotation. The hand tool has a protective device with which a so-called uncontrollable blocking case of the insert tool can be detected via a sensor. The rotary drive is interrupted by a clutch disposed in the drive train is automatically disengaged in response to an overload size, whereby the housing is blocked in its movement. By manually pressing an engagement plate, the clutch can be mechanically re-engaged directly by the engagement plate with a lever compresses a release spring of the clutch.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine mit einem in einem Gehäuse angeordneten Elektromotor, über den ein in einer Werkzeughalterung angeordnetes Einsatzwerkzeug rotierend antreibbar ist, und mit einer Schutzvorrichtung, mit der über eine Sensoreinheit ein unbeherrschbarer Blockierfall des Einsatzwerkzeugs erkennbar und das Gehäuse in seiner Bewegung blockierbar ist, wobei die Schutzvorrichtung eine mechanische Entriegelungseinheit umfasst, die durch eine Betätigungskraft eines Bedieners manuell betätigbar ist.The invention is based on a hand tool with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder can be driven in rotation, and with a protective device with which a sensor unit uncontrollable blocking case of the insert tool recognizable and the housing is blockable in its movement, wherein the protective device comprises a mechanical unlocking unit, which is manually actuated by an operating force of an operator.

Es wird vorgeschlagen, dass ein Getriebe über ein Ein/Ausschalt-Mittel zum Betätigen der Entriegelungseinheit betätigbar ist. Damit kann die Entriegelungseinheit beim Einschalten des Elektromotors zuverlässig gelöst werden. Die Betätigungskraft des Bedieners entriegelt die Schutzvorrichtung. Die Entriegelungseinheit benötigt daher keine aufwändigen elektronischen Komponenten und ist besonders ausfallsicher. Weiterhin sind mechanische Komponenten preiswert und benötigen keine elektrische Leistung. Die Schutzvorrichtung kann in einem unbeherrschbaren Blockierfall ausgelöst werden und ohne besonderen Aufwand beim Wiedereinschalten der Handwerkzeugmaschine zurückgesetzt und wieder aktiviert werden. Gegenüber elektrischen oder elektronischen Systemen ist die Funktion der Schutzvorrichtung erheblich vereinfacht. Die mechanisch betätigbare Entriegelungseinheit kann mit mechanischen, elektrischen und elektronischen Varianten von Sensoreinheiten und/oder Blockiereinheiten einer Schutzvorrichtung kombiniert werden. Das Getriebe kann vorzugsweise als Nockengetriebe ausgeführt sein. Optional kann auch ein Hebelgetriebe vorgesehen sein oder ein anderes, dem Fachmann sinnvoll erscheinendes Getriebe. Besonders bevorzugt ist das Ein/Ausschalt-Mittel als Schaltklinke ausgebildet, die vom Bediener zum Ein- und Ausschalten der Handwerkzeugmaschine betätigt wird. Alternativ kann das Ein/Ausschalt-Mittel auch in die Handwerkzeugmaschine so integriert sein, dass dieses beim Andrücken des Werkzeugs bzw. der Handwerkzeugmaschine an eine Bearbeitungsfläche ausgelöst wird.It is proposed that a transmission via an on / off means for actuating the unlocking unit is actuated. Thus, the unlocking unit can be reliably solved when switching on the electric motor. The operating force of the operator unlocks the protection device. The unlocking therefore requires no complex electronic components and is particularly fail-safe. Furthermore, mechanical components are inexpensive and do not require electrical power. The protective device can be triggered in an uncontrollable blocking case and reset without special effort when switching on the power tool and re-activated. Compared to electrical or electronic systems, the function of the protection device is considerably simplified. The mechanically actuatable unlocking unit can be combined with mechanical, electrical and electronic variants of sensor units and / or blocking units of a protective device. The transmission may preferably be designed as a cam gear. Optionally, a lever mechanism may be provided or another, the expert appear appropriate gear. Particularly preferably, the on / off means is designed as a pawl, which is actuated by the operator for switching on and off of the power tool. Alternatively, the on / off means may be integrated into the hand tool so that it is triggered when pressing the tool or the power tool to a working surface.

Vorzugsweise ist die Entriegelungseinheit beim Wiedereinschalten des Elektromotors automatisch über das Ein/Ausschalt-Mittel betätigt. Dann kann die Schutzvorrichtung ohne weiteres Zutun des Bedieners neu aktiviert werden und ist sofort betriebsbereit. Es ist sichergestellt, dass der Elektromotor erst dann startet, wenn die Entriegelungseinheit gelöst ist und die Schutzvorrichtung wieder einsatzbereit ist. Die Schutzvorrichtung der Handwerkzeugmaschine ist komfortabel bedienbar.Preferably, the unlocking unit is automatically actuated when switching on the electric motor via the on / off means. Then the protection device can be reactivated without further action by the operator and is ready for immediate use. It is ensured that the electric motor only starts when the unlocking unit is released and the protective device is ready for use again. The protective device of the power tool is easy to use.

Umfasst die Schutzvorrichtung eine mechanische Sensoreinheit, ergeben sich eine weitere Vereinfachung des Systems und eine reduzierte Störanfälligkeit.If the protective device comprises a mechanical sensor unit, this results in a further simplification of the system and a reduced susceptibility to interference.

Bevorzugt weist die Sensoreinheit eine Rückstellfeder auf, die beim Wiedereinschalten der Handwerkzeugmaschine die Sensoreinheit auch nach einem Blockierfall automatisch wieder aktiviert und betriebsbereit macht.Preferably, the sensor unit has a return spring, which automatically re-activates and makes ready the sensor unit even after a blocking event when switching on the power tool.

In einer alternativen Ausgestaltung umfasst die Schutzvorrichtung eine elektrische Sensoreinheit. Dies ermöglicht den Einsatz intelligenter Sensoren in einem gemischten mechanisch-elektrischen System mit einem rein mechanischen so genannten Reset und einer elektrischen Sensoreinheit.In an alternative embodiment, the protective device comprises an electrical sensor unit. This allows the use of intelligent sensors in a mixed mechanical-electrical system with a purely mechanical so-called reset and an electrical sensor unit.

Umfasst die Schutzvorrichtung eine mechanische Blockiereinheit, kann eine rein mechanische Schutzvorrichtung dargestellt werden, die sehr verlässlich arbeitet und eine große Betriebssicherheit ermöglicht.If the protection device comprises a mechanical blocking unit, a purely mechanical protection device can be shown that works very reliably and allows a high level of operational safety.

Bevorzugt weist die Blockiereinheit einen drehbar gelagerten Rasthebel mit einer zum Eingriff in eine Blockierverzahnung vorgesehenen Verzahnung an einem Ende und einem Fortsatz am gegenüberliegenden Ende auf. Die Blockierverzahnung kann im unbeherrschbaren Blockierfall eine Rotation des Gehäuses blockieren.Preferably, the blocking unit has a rotatably mounted latching lever with a toothing provided for engagement in a blocking toothing at one end and an extension at the opposite end. The blocking teeth can block a rotation of the housing in uncontrollable blocking case.

In einer alternativen Ausgestaltung umfasst die Schutzvorrichtung eine elektrische Blockiereinheit. Dies ermöglicht einen Aufbau eines gemischten mechanisch-elektrischen Systems mit einem rein mechanischen so genannten Reset und einer elektrischen Blockiereinheit.In an alternative embodiment, the protection device comprises an electrical blocking unit. This allows a structure of a mixed mechanical-electrical system with a purely mechanical so-called reset and an electrical blocking unit.

Weist die Entriegelungseinheit eine Schaltstange auf, deren eines Ende mit einem Ein/Ausschalt-Mittel verbunden ist und deren anderes Ende mit der Blockiereinheit in Wirkverbindung steht, ist über die Entriegelungseinheit die Blockiereinheit betätigbar.If the unlocking unit has a switching rod whose one end is connected to an on / off means and whose other end is in operative connection with the blocking unit, the blocking unit can be actuated via the unlocking unit.

Bevorzugt ist die Schaltstange längsverschiebbar entlang der Drehachse gelagert. Damit kann eine Bewegung des Ein/Ausschalt-Mittels in Längsrichtung zur Betätigung der Schaltstange ausgenutzt werden.Preferably, the shift rod is mounted longitudinally displaceable along the axis of rotation. Thus, a movement of the on / off means in the longitudinal direction can be utilized for the actuation of the shift rod.

In einer bevorzugten Ausgestaltung weist die Schaltstange eine Schaltnase und einen Schaltnocken auf, womit eine durch eine Betätigung des Ein/Ausschalt-Mittels ausgelöste Bewegung in Längsrichtung in eine Auf-Ab-Bewegung mit einer ersten oberen Position und einer zweiten unteren Position umsetzbar ist. Mit der Auf-Ab-Bewegung kann die Schaltstange mindestens zwei verschiedene Betriebszustände für einen Blockierfall und zum Entriegeln der Schutzvorrichtung einnehmen.In a preferred embodiment, the shift rod on a switching lug and a switching cam, whereby a triggered by an actuation of the on / off means movement in the longitudinal direction in an up-down movement with a first upper position and a second lower position can be implemented. With the up-down movement, the shift rod can occupy at least two different operating states for a case of blocking and unlocking the protection device.

Vorzugsweise greift die Schaltstange an einem Ende mit einem Betätigungsstift an dem Ein/Ausschalt-Mittel und am anderen Ende mit einem Verbindungsteil in den Fortsatz des Rasthebels ein. Durch ein Betätigen des Ein/Ausschalt-Mittels kann der Rasthebel betätigt werden.Preferably, the shift rod engages at one end with an actuating pin on the on / off means and at the other end with a connecting part in the extension of the locking lever. By pressing the on / off means of the locking lever can be actuated.

Bevorzugt befindet sich bei ausgeschaltetem Elektromotor und gelöstem Ein/Ausschalt-Mittel die Schaltstange in der oberen Position. Damit nimmt die Schaltstange eine neutrale Position ein, die ohne Wirkung auf die Handwerkzeugmaschine bleibt. Ist ein Blockierfall eingetreten, kann dieser auch beim Loslassen des Ein/Ausschalt-Mittels und beim Ausschalten des Elektromotors beibehalten werden.Preferably, with the electric motor switched off and the on / off switching means released, the shift rod is in the upper position. Thus, the shift rod assumes a neutral position, which remains without effect on the power tool. If a blocking case has occurred, this can also be maintained when releasing the on / off means and when switching off the electric motor.

Ist beim Betätigen des Ein/Ausschalt-Mittels die Schaltstange in die untere Position bewegbar und der Rasthebel aus der Blockierverzahnung entfernbar, ist ohne weiteres Zutun des Bedieners beim Wiedereinschalten des Elektromotors die Blockierverzahnung entriegelt und die Schutzvorrichtung wieder aktiviert. Vorzugsweise wird in einer ersten Bewegung des Ein/Ausschalt-Mittel die Schutzvorrichtung zurückgesetzt und aktiviert und bei Fortsetzung der Bewegung anschließend der Elektromotor elektrisch eingeschaltet. Damit ist gewährleistet, dass der Elektromotor immer nur bei aktivierter Schutzvorrichtung läuft.Is when operating the on / off means the shift rod in the lower position movable and the locking lever from the blocking toothing, the locking teeth is unlocked without further action by the operator when switching on the electric motor and the protection device activated again. Preferably, in a first movement of the on / off means, the protection device is reset and activated, and then, when the movement is continued, the electric motor is switched on electrically. This ensures that the electric motor always runs only when the protection device is activated.

Ist zum Blockieren der Bewegung des Gehäuses ein Drehmomentfluss durch eine Kupplung unterbrechbar, verhindert dies eine Bewegung des Gehäuses. Die Kupplung kann eine mechanisch oder elektrisch betreibbare Kupplung sein.If a torque flow through a coupling can be interrupted to block the movement of the housing, this prevents movement of the housing. The coupling may be a mechanically or electrically operable coupling.

Sind der Elektromotor und/oder elektrische Komponenten im Blockierfall ausschaltbar, kann Energie gespart werden. Zum manuellen Entriegeln der Entriegelungseinheit ist der Elektromotor bereits ausgeschaltet, und der Bediener kann die Handwerkzeugmaschine schnell wieder in Betrieb nehmen. Ist der Elektromotor ausgeschaltet und wird eine elektrische Kupplung geöffnet, um den Drehmomentfluss im Blockierfall zu unterbrechen, kann sichergestellt werden, dass das Gehäuse in seiner Bewegung blockiert bleibt.If the electric motor and / or electrical components can be switched off in the event of a blockage, energy can be saved. For manually unlocking the unlocking unit, the electric motor is already switched off, and the operator can quickly put the hand tool machine back into operation. If the electric motor is switched off and an electric clutch is opened to interrupt the torque flow in the event of a lock, it can be ensured that the housing remains blocked in its movement.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:Show it:

Fig. 1Fig. 1
einen Schnitt durch eine bevorzugte Handwerkzeugmaschine,a section through a preferred hand tool,
Fig. 2Fig. 2
schematisch eine bevorzugte Schutzvorrichtung mit mechanischer Sensoreinheit, mechanischer Blockiereinheit und mechanischer Entriegelungseinheit im Schnitt,schematically a preferred protection device with a mechanical sensor unit, mechanical blocking unit and mechanical unlocking unit in section,
Fig. 3Fig. 3
ein Detail der mechanischen Sensoreinheit nach der durch Bezugnahme eingeschlossenen DE 43 00 021 A1,a detail of the mechanical sensor unit according to the incorporated by reference DE 43 00 021 A1,
Fig. 4Fig. 4
ein Detail der Schaltstange.a detail of the shift rod.
Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig. 1 zeigt eine Handwerkzeugmaschine mit einem in einem Gehäuse 10 angeordneten, nicht dargestellten Elektromotor. Der Elektromotor treibt ein in einer Werkzeughalterung 16 angeordnetes Einsatzwerkzeug 12 rotierend an. Mit einem als Schaltklinke eines Ein-Aus-Schalters ausgebildeten Ein/Ausschalt-Mittel 20 in einem Handgriff 18 der Handwerkzeugmaschine ist eine Schutzvorrichtung 54 entriegelbar. Tritt ein unbeherrschbarer Blockierfall auf, besteht die Gefahr, dass das Gehäuse 10 um eine Drehachse 14 rotiert.Fig. 1 shows a hand tool with a arranged in a housing 10, not shown electric motor. The electric motor drives a arranged in a tool holder 16 insert tool 12 rotating. With a trained as a pawl of an on-off switch on / off means 20 in a handle 18 of the power tool, a protective device 54 can be unlocked. If an uncontrollable blocking case occurs, there is a risk that the housing 10 will rotate about an axis of rotation 14.

Mit der Schutzvorrichtung 54 ist über eine Sensoreinheit 22 ein unbeherrschbarer Blockierfall des Einsatzwerkzeugs 12 erkennbar und das Gehäuse 10 in seiner Bewegung blockierbar; vorzugsweise wird der Elektromotor abgeschaltet. Eine bevorzugte Schutzvorrichtung 54 ist in Fig. 2 dargestellt. Eine mechanische Sensoreinheit 22 ist mit einer mechanischen Blockiereinheit 52 wirkverbunden. Eine besonders bevorzugte Blockiereinheit 52 und die Sensoreinheit 22 sind in der Offenlegungsschrift DE 43 00 021 beschrieben, deren Offenbarung durch Bezugnahme ausdrücklich eingeschlossen ist. Erkennt die Sensoreinheit 22 einen unbeherrschbaren Blockierfall, löst die Sensoreinheit 22 aus und aktiviert eine Blockiereinheit 52. Die Blockiereinheit 52 umfasst einen gefedert und drehbar gelagerten Rasthebel 28, der an einem Ende eine Blockierverzahnung 26 aufweist. Der Rasthebel 28 kann durch die drehbare Lagerung eine Auf-Ab-Bewegung ausführen. Zusätzlich kann eine nicht dargestellte seitliche Abstützung vorgesehen sein, um ein seitliches Auslenken des Rasthebels 28 zu unterbinden. Der Rasthebel 28 ist zwischen Blockierverzahnung 26 und Lagerung mit der Sensoreinheit 22 in Kontakt. An dem der Blockierverzahnung 26 entgegengesetzten Ende ist der Rasthebel 28 mit einem Fortsatz 30 versehen, in den eine Entriegelungseinheit 50 eingreift.With the protection device 54, an uncontrollable blocking case of the insertion tool 12 can be recognized via a sensor unit 22 and the housing 10 can be blocked in its movement; Preferably, the electric motor is switched off. A preferred protection device 54 is shown in FIG. A mechanical sensor unit 22 is operatively connected to a mechanical blocking unit 52. A particularly preferred blocking unit 52 and the sensor unit 22 are described in the published patent application DE 43 00 021, the disclosure of which is expressly incorporated by reference. If the sensor unit 22 detects an uncontrollable blocking event, the sensor unit 22 triggers and activates a blocking unit 52. The blocking unit 52 comprises a latching lever 28 which is spring-mounted and rotatably mounted and has a blocking toothing 26 at one end. The locking lever 28 can perform an up-down movement by the rotatable mounting. In addition, a lateral support, not shown, may be provided to prevent lateral deflection of the locking lever 28. The locking lever 28 is between blocking teeth 26 and storage with the sensor unit 22 in contact. At the opposite end of the blocking teeth 26, the locking lever 28 is provided with an extension 30, in which an unlocking unit 50 engages.

Die Entriegelungseinheit 50 umfasst eine Schaltstange 34, die an einem dem Fortsatz 30 abgewandten Ende mit einem Betätigungsstift 38 an dem als Schaltklinke ausgebildeten Ein/Ausschalt-Mittel 20 befestigt und längsverschiebbar entlang der Drehachse 14 (Fig. 1) gelagert ist. Die Schaltstange 34 greift mit einem Verbindungsteil 32 in den Fortsatz 30 ein und durch eine Öffnung im Fortsatz 30 durch.The unlocking unit 50 comprises a switching rod 34, which is fastened on an end facing away from the extension 30 with an actuating pin 38 on the switching-pawl formed on / off-means 20 and longitudinally displaceable along the axis of rotation 14 (FIG. 1). is stored. The shift rod 34 engages with a connecting part 32 in the extension 30 and through an opening in the extension 30 through.

In der Schaltstange 34 sind eine Schaltnase 36 und ein Schaltnocken 40 vorgesehen, womit eine durch eine Betätigung des als Schaltklinke ausgebildeten Ein/Ausschalt-Mittels 20 ausgelöste Bewegung in Längsrichtung in eine Auf-Ab-Bewegung mit einer ersten oberen Position und einer zweiten unteren Position umsetzbar ist. Die Schaltnase 36 und der Schaltnocken 40 sind in Fig. 4 in Detailansicht dargestellt. Durch eine Ein-AusschaltBewegung des als Schaltklinke ausgebildeten Ein/Ausschalt-Mittels 20 wird die Schaltstange 34 in Längsrichtung bewegt. Die daraus folgende Auf-Ab-Bewegung betätigt ein so genanntes Reset der Schutzvorrichtung.In the shift rod 34, a shift lug 36 and a shift cam 40 are provided, whereby a triggered by an operation of the pawl formed on / off means 20 longitudinal movement in an up-down movement with a first upper position and a second lower position is feasible. The switching nose 36 and the switching cam 40 are shown in Fig. 4 in detail view. By an on-off movement of the switching pawl formed on / off means 20, the shift rod 34 is moved in the longitudinal direction. The ensuing up-down movement activates a so-called reset of the protection device.

Die Sensoreinheit 22 ist in Fig. 3 in einer Detailansicht dargestellt. Das Funktionsprinzip ist in der DE 43 00 021 A1 beschrieben, deren Inhalt durch Bezugnahme eingeschlossen ist. Die Blockiereinheit 52 ruht mit der am Rasthebel 28 angebrachten Rastklinke 46 am Umfang einer Scheibe 42 und kann mit dieser in eine Ausnehmung 56 eingreifen. Der Abstand zwischen Rasthebel 28 und Scheibe 42 ist unterschiedlich, je nachdem, ob die Rastklinke 46 am Umfang oder in der Ausnehmung 56 anliegt. Die seitliche Halterung 48 verhindert ein seitliches Ausweichen. In der gezeigten Position ist der Abstand groß, und der Rasthebel 28 wird von der Rastklinke 46 nach oben gedrückt. Dreht die Scheibe 42 bei Erkennen eines Blockierfalls nach links, greift die Rastklinke 46 in die Ausnehmung 56 der Scheibe 42 ein. Der Rasthebel 28 bewegt sich nach unten, und die Blockierverzahnung 26 wird aktiviert.The sensor unit 22 is shown in FIG. 3 in a detailed view. The principle of operation is described in DE 43 00 021 A1, the content of which is incorporated by reference. The blocking unit 52 rests with the latching lever 28 attached to the detent pawl 46 on the circumference of a disc 42 and can engage with this in a recess 56. The distance between locking lever 28 and disc 42 is different, depending on whether the latch 46 rests on the circumference or in the recess 56. The lateral support 48 prevents lateral deflection. In the position shown, the distance is large, and the locking lever 28 is pressed by the latch 46 upwards. Turns the disc 42 upon detection of a blocking case to the left, the latch 46 engages in the recess 56 of the disc 42 a. The detent lever 28 moves down and the locking teeth 26 are activated.

Ein Zurücksetzen und Aktivieren der Schutzvorrichtung 54 wird wie folgt vorgenommen: Ist ein unbeherrschbarer Blockierfall eingetreten und das als Schaltklinke ausgebildete Ein/Ausschalt-Mittel 20 vom Bediener noch gedrückt, aber der Elektromotor bereits abgeschaltet und versucht der Bediener, die Handwerkzeugmaschine wieder einzuschalten, muss er zunächst das als Schaltklinke ausgebildete Ein/Ausschalt-Mittel 20 loslassen. Die damit eingeleitete Auf-Bewegung der Schaltstange 34 in die obere Position ist ohne Wirkung. Der Bediener nimmt nun die Handwerkzeugmaschine in die Hände und schaltet die Handwerkzeugmaschine ein. Durch den Beginn der Einschaltbewegung wird die Schaltstange 34 durch den Schaltnocken 40 nach unten gedrückt und die Verzahnung des Rasthebels 28 aus der Blockierverzahnung 26 gehoben. Die Rückstellfeder 24 bringt die Sensoreinheit 22 wieder in Ausgangsstellung, und die Schutzvorrichtung 54 ist wieder betriebsbereit. Durch die weitere Einschaltbewegung des als Schaltklinke ausgebildeten Ein/Ausschalt-Mittels 20 wird der Elektromotor eingeschaltet, und der Arbeitsvorgang der Handwerkzeugmaschine wird fortgesetzt. Tritt unmittelbar danach wieder ein unbeherrschbarer Blockierfall ein, kann die Schutzvorrichtung 54 sofort wieder reagieren. Eine bevorzugte Handwerkzeugmaschine ist insbesondere ein Bohrhammer oder eine Schlagbohrmaschine. Die Schutzvorrichtung 54 ist jedoch auch für andere Elektrowerkzeugmaschinen mit rotierend antreibbaren Einsatzwerkzeugen, z.B. Winkel- und Exzenterschleifern, Kreissägen, Kettensägen und dergleichen geeignet.Resetting and activating the protection device 54 is carried out as follows: If an uncontrollable blocking case has occurred and the switching pawl on / off means 20 is still pressed by the operator, but the electric motor is already switched off and the operator tries to turn on the power tool, he must first let go of the switching pawl formed on / off means 20. The thus initiated on-movement of the shift rod 34 in the upper position has no effect. The operator now takes the hand tool in his hands and turns the Hand tool machine. By the beginning of the switch-on movement, the shift rod 34 is pressed by the switching cam 40 down and lifted the teeth of the locking lever 28 from the blocking teeth 26. The return spring 24 brings the sensor unit 22 back into the starting position, and the protective device 54 is ready for operation again. As a result of the further switch-on movement of the switching-on / switching-off means 20, the electric motor is switched on, and the working process of the handheld power tool is continued. If an uncontrollable blocking event occurs again immediately, the protective device 54 can react again immediately. A preferred hand tool machine is in particular a hammer drill or a percussion drill. However, the protective device 54 is also suitable for other power tool machines with rotationally drivable insert tools, for example, angle and eccentric grinders, circular saws, chain saws and the like.

Bezugszeichenreference numeral

1010
Gehäusecasing
1212
Einsatzwerkzeugapplication tool
1414
Drehachseaxis of rotation
1616
Werkzeughalterungtool holder
1818
Handgriffhandle
2020
Ein/Ausschalt-MittelOn / off switch means
2222
Sensoreinheitsensor unit
2424
RückstellfederReturn spring
2626
Blockierverzahnungblocking teeth
2828
Rasthebellocking lever
3030
Fortsatzextension
3232
Verbindungsteilconnecting part
3434
Schaltstangeshift rod
3636
Schaltnaseswitching lug
3838
Betätigungsstiftactuating pin
4040
Schaltnockenswitching cams
4242
Scheibedisc
4444
Stiftpen
4646
Rastklinkelatch
4848
Halterungbracket
5050
Entriegelungseinheitunlocking
5252
Blockiereinheitblocking unit
5454
Schutzvorrichtungguard
5656
Ausnehmungrecess

Claims (16)

  1. Portable power tool with an electric motor which is arranged in a housing (10) and via which an inserted tool (12) arranged in a toolholder (16) can be rotatingly driven, and with a protection device, with which an uncontrollable blocking situation of the inserted tool (12) can be detected via a sensor unit (22) and the movement of the housing (10) can be blocked, the protection device (54) comprising a mechanical unlocking unit (50) which can be actuated manually by an actuating force of an operator, characterized in that a mechanism can be actuated via a switching on/off means (20) in order to actuate the unlocking unit (50).
  2. Portable power tool according to Claim 1, characterized in that, when the electric motor is switched on again, the unlocking unit (50) is actuated automatically via the switching on/off means (20).
  3. Portable power tool according to Claim 1 or 2, characterized in that the protection device (54) comprises a mechanical sensor unit (22).
  4. Portable power tool according to Claim 3, characterized in that the sensor unit (22) comprises a restoring spring (24).
  5. Portable power tool according to one of the preceding claims, characterized in that the protection device (54) comprises an electric sensor unit (22).
  6. Portable power tool according to one of the preceding claims, characterized in that the protection device (54) comprises a mechanical blocking unit (52).
  7. Portable power tool according to Claim 6, characterized in that the blocking unit (52) has a rotatably mounted latching lever (28) with a toothing, provided for engagement in a blocking toothing (26), at one end and an extension (30) at the opposite end.
  8. Portable power tool according to one of the preceding claims, characterized in that the protection device (54) comprises an electric blocking unit (52).
  9. Portable power tool according to one of the preceding claims, characterized in that the unlocking unit (50) has a switching rod (34), one end of which is connected to a switching on/off means (20) and the other end of which is operatively connected to the blocking unit (52).
  10. Portable power tool according to Claim 9, characterized in that the switching rod (34) is mounted in a longitudinally displaceable manner along the axis of rotation (14).
  11. Portable power tool according to Claim 9 or 10, characterized in that the switching rod (34) has a switching lug (36) and a switching cam (40), with which a movement in the longitudinal direction, triggered by an actuation of the switching on/off means (20), can be converted into an up-down movement with a first upper position and a second lower position.
  12. Portable power tool according to one of Claims 9 to 11, characterized in that the switching rod (34) engages at one end on the switching on/off means (20) by means of an actuating pin (38) and at the other end in the extension (30) of the latching lever (28) by means of a connecting part.
  13. Portable power tool according to one of the preceding Claims 9 to 12, characterized in that, when the electric motor is switched off and the switching on/off means (20) is released, the switching rod (34) is in the upper position.
  14. Portable power tool according to one of the preceding Claims 9 to 13, characterized in that, when the switching on/off means (20) is actuated, the switching rod (34) can be moved into the lower position and the latching lever (28) can be removed from the blocking toothing (26).
  15. Portable power tool according to one of the preceding claims, characterized in that, in order to block the movement of the housing (10), a flow of torque through a coupling can be interrupted.
  16. Portable power tool according to one of the preceding claims, characterized in that the electric motor and/or electric components (22, 54) can be switched off in the blocking situation.
EP04786863A 2003-11-13 2004-09-25 Portable power tool Expired - Fee Related EP1684949B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10353013A DE10353013A1 (en) 2003-11-13 2003-11-13 Hand tool
PCT/DE2004/002148 WO2005046940A1 (en) 2003-11-13 2004-09-25 Portable power tool

Publications (2)

Publication Number Publication Date
EP1684949A1 EP1684949A1 (en) 2006-08-02
EP1684949B1 true EP1684949B1 (en) 2007-05-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04786863A Expired - Fee Related EP1684949B1 (en) 2003-11-13 2004-09-25 Portable power tool

Country Status (6)

Country Link
US (1) US7306046B2 (en)
EP (1) EP1684949B1 (en)
JP (1) JP4215800B2 (en)
CN (1) CN100515691C (en)
DE (2) DE10353013A1 (en)
WO (1) WO2005046940A1 (en)

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Also Published As

Publication number Publication date
DE502004003723D1 (en) 2007-06-14
DE10353013A1 (en) 2005-06-16
WO2005046940A1 (en) 2005-05-26
US20060260831A1 (en) 2006-11-23
CN100515691C (en) 2009-07-22
EP1684949A1 (en) 2006-08-02
JP2006525875A (en) 2006-11-16
JP4215800B2 (en) 2009-01-28
US7306046B2 (en) 2007-12-11
CN1878639A (en) 2006-12-13

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