EP3820651B1 - Handheld machine tool - Google Patents

Handheld machine tool Download PDF

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Publication number
EP3820651B1
EP3820651B1 EP19733537.5A EP19733537A EP3820651B1 EP 3820651 B1 EP3820651 B1 EP 3820651B1 EP 19733537 A EP19733537 A EP 19733537A EP 3820651 B1 EP3820651 B1 EP 3820651B1
Authority
EP
European Patent Office
Prior art keywords
power tool
handheld power
catch
joint
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19733537.5A
Other languages
German (de)
French (fr)
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EP3820651A1 (en
Inventor
Eric Filip
Jerome Jaromin
Olaf Koch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
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Hilti AG
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Publication date
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Publication of EP3820651A1 publication Critical patent/EP3820651A1/en
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Classifications

    • 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
    • B25F5/02Construction of casings, bodies or handles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04Handles; Handle mountings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2211/00Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06Means for driving the impulse member
    • B25D2211/068Crank-actuated impulse-driving mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121Housing details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/255Switches
    • B25D2250/261Means for locking an operative switch on

Definitions

  • the present invention relates to a hand-held power tool which has a mechanism for locking an operating button in an actuated position.
  • a hand tool according to the preamble of claim 1 is already from EP 1 864 761 A1 known.
  • a hand-held power tool has a tool holder for holding a tool, an impact mechanism, an electric motor for driving the impact mechanism, a monostable operating button that has a stable switch position and a pressed switch position, and a device controller that switches off the electric motor in response to the stable switch position and which activated the electric motor in response to the depressed switch position.
  • a pawl is provided which can be pivoted in a pivoting direction between a releasing position and a locking position, the pawl in the locking position inhibiting the monostable operating button in the pressed switch position.
  • An operating knob is slidable by the user in a sliding direction perpendicular to the pivoting direction. The pawl is applied to the actuating knob via a joint.
  • a connecting link converts a movement of the pawl along the sliding direction into a pivoting movement in the pivoting direction.
  • the pawl and the associated operating knob are a structural unit that can be installed in a single assembly step.
  • the associated connecting link can be part of a housing of the hand-held power tool or can be formed on the housing.
  • the example hammer drill 1 shows a hammer drill 1 as an example of a hand-held power tool.
  • the example hammer drill 1 has a tool holder 2 in which a tool 3 can be inserted and locked.
  • the tool 3 is, for example, a drill, a chisel, etc.
  • the embodiment shown as an example rotates the tool holder 2 about a working axis 4 and at the same time periodically impacts the tool along the working axis 4 .
  • the hand-held power tool 1 can have a mode selector switch 5 , which allows the user to selectively activate and deactivate the rotary movement and selectively the hammering operation.
  • the user can start up the hand-held power tool 1 with a monostable operating button 6 .
  • the hand-held power tool 1 has a handle 7.
  • the user can hold and guide the hand-held power tool 1 with the handle 7 during operation.
  • the operating button 6 is preferably attached to the handle 7 in such a way that the user can actuate the operating button 6 with the hand gripping the handle 7 .
  • the handle 7 can be decoupled from a machine housing 8 via damping elements.
  • the hand-held power tool 1 has a rotary drive 9 which is coupled to the tool holder 2 .
  • the rotary drive 9 can have, among other things, a reducing gear 10 and a slipping clutch 11 .
  • An output shaft 12 of the rotary drive 9 is connected to the tool holder 2 .
  • the rotary drive 9 is coupled to an electric motor 13 .
  • the user can switch the electric motor 13 on and off by pressing the operating button 6 , with the operating button 6 correspondingly controlling a power supply of the electric motor 13 .
  • a speed of the electric motor 13 can be set using the operating button 6 .
  • a device controller 14 detects the position of the operating button 6 and controls the electric motor 13 in response.
  • the hand-held power tool 1 has a pneumatic impact mechanism 15.
  • the pneumatic impact mechanism 15 has an exciter piston 16 and an impact piston 17.
  • the exciter piston 16 is rigidly coupled to the electric motor 13 .
  • An eccentric wheel 18 and a connecting rod 19 transform the rotational movement of the electric motor 13 into a translatory movement on the working axis 4.
  • the exciter piston 16 and the percussion piston 17 close a pneumatic chamber 20 between one another.
  • a radial closure of the pneumatic chamber 20 is given in the illustrated embodiment by a guide tube 21 , which at the same time guides the exciter piston 16 and the percussion piston.
  • the percussion piston can be hollow and the exciter piston 16 is guided in the percussion piston or vice versa.
  • the air trapped in the pneumatic chamber 20 is compressed and decompressed by the exciter piston 16 .
  • the pressure changes couple the hammer piston to the movement of the exciter piston 16 , the pneumatic chamber 20 behaves in the same way as a spring, hence the name air spring.
  • the percussion piston 17 can strike the tool 3 directly or indirectly via a snap die 22 on the tool.
  • the handheld power tool 1 is switched on and off by the operating button 6 .
  • the operating button 6 is arranged in the handle 7 .
  • the operating button 6 has a switching cap 23 which the user can grip. When the operating button 6 is in a rest position, the switching cap 23 protrudes from the handle 7 counter to a switching direction 24 ( 2 ).
  • the switching cap 23 is preferably in contact with a stop 25 of the machine housing 8 .
  • the user can press the switching cap 23 in the switching direction 24 into a pressed switching position ( 3 ).
  • the switch cap 23 can slide or pivot into the handle 7 .
  • the switching cap 23 can, as shown in the example shown, be pivotable or linearly guided about a bearing point.
  • the switching cap 23 is at a distance from the stop 25.
  • the switching cap 23 is acted upon by a restoring element 26, for example a helical spring, with a force which acts counter to the switching direction 24 .
  • the restoring element 26 is more tensioned in the depressed switch position than in the rest position, as a result of which the switch cap 23 is only stable in the rest position.
  • the switch cap 23 returns to the rest position when the user releases the switch cap 23 .
  • the switching direction 24 is preferably antiparallel to the working direction 27 in which the tool 3 points.
  • the switching cap 23 is coupled to a switching mechanism 28 of the operating button 6 .
  • the switching mechanism 28 deactivates the electric motor 13 when the switching cap 23 is in the rest position.
  • the switch mechanism 28 activates the electric motor 13 when the switch cap 23 is in the depressed position.
  • the switching mechanism 28 can a electromechanical, optical, magnetic or other sensor for determining the position of the switch cap 23 include.
  • the switching mechanism 28 can set a speed or power consumption of the electric motor 13 as a function of positions that are pressed to different degrees.
  • the hand-held power tool 1 has a locking switch 29.
  • the locking switch has a release position ( 2 ) and a locking position ( 3 ).
  • the lock switch 29 has an operating knob 30 which is grippable by the user. The user can move the actuating knob 30 between a first position and a second position in the sliding direction 31 .
  • the first position is associated with the release position of the lock switch 29 and the second position is associated with the locking position of the lock switch 29 .
  • the sliding direction 31 is preferably antiparallel to the switching direction 24 of the operating button 6.
  • the locking switch 29 has a pivotable pawl 32 which engages in the switching cap 23 in the locking position.
  • the pawl 32 inhibits the movement of the switching cap 23 against the switching direction 24 and thus the return of the switching cap 23 to the rest position.
  • the operating button 6 remains in the pressed switch position.
  • the electric motor 13 remains activated even if the user releases the switch cap 23 .
  • the pawl 32 interacts with the switch cap 23.
  • the switch cap 23 has a locking surface 33 against which the pawl 32 can rest in the locked position.
  • the blocking surface 33 can be realized by the outer contour of the switching cap 23 or by a rib or the like that is accessible from the outside.
  • the blocking surface 33 is preferably largely perpendicular to the switching direction 24.
  • the blocking surface 33 points in the opposite direction to the switching direction 24 and towards the pawl 32.
  • the pawl 32 can be pivoted in a pivoting direction 34 which is perpendicular to the switching direction 24 .
  • the pawl 32 can be pivoted in the shifting direction 24 between a first position associated with the releasing position and a second position associated with the locking position.
  • the pawl 32 is in the releasing position without overlapping with the blocking surface 33.
  • the overlap relates to the switching direction 24, ie the overlap can be determined in the projection onto a plane perpendicular to the switching direction 24 .
  • the latch 32 overlaps the stop 33 in the locked position.
  • a tip 35 of the pawl 32 is in the switching direction 24 on the Blocking surface 33 on. The tip 35 exerts a counterforce to the restoring element, analogously to the gripping hand, as a result of which the operating button 6 remains pressed.
  • the position of the tip 35 along the switching direction 24 corresponds to the position of the stop 33 along the switching direction 24 when the operating button 6 is pressed.
  • the tip 35 can protrude beyond the stop 33 in the switching direction 24 when the operating button 6 is in the rest position.
  • the locking switch 29 has no function when the handheld power tool 1 is switched off.
  • the pawl 32 is resiliently attached to the operating knob 30 .
  • a hinge 36 connects the operating knob 30 and the pawl 32.
  • the hinge 36 is pivotable about an axis 37 which is perpendicular to the pivoting direction 34 .
  • the joint 36 is preferably designed as a solid joint.
  • the hinge 36 is made of the same material as the pawl 32 and preferably as the operating knob 30.
  • the hinge 36 has less rigidity than the pawl 32 in the pivoting direction 34. The low rigidity is due to a small thickness, ie smaller dimension along the pivoting direction 34, realized.
  • the joint 36 can be reversibly, possibly elastically, deformed to such an extent that the pawl 32 can be pivoted between the locking and releasing position.
  • the joint 36 is preferably clamped in the locking position and free of force in the releasing position.
  • a link 38 pivots the pawl 32 in response to the position of the operating knob 30.
  • the link 38 includes an inclined rail 39 on the machine housing 8.
  • the rail 39 rises along the sliding direction 31 in the pivoting direction 34 .
  • the rail 39 has, in relation to the pivoting direction 34, a lower guide surface 40 and an upper guide surface 41.
  • the lower guide surface 40 faces the actuating knob 30 ;
  • the upper guide surface 42 faces away from the operating knob 30 .
  • the pawl 32 has a lower finger 42 which rides on the lower guide surface 40 and an upper finger 43 which rides on the upper guide surface 42 .
  • the upper finger 43 pulls the pawl 32 in the pivoting direction 34 in order to follow the upper guide surface 41.
  • the lower finger 42 presses in order to close the lower guide surface 40 follow, the pawl 32 counter to the pivoting direction 34.
  • the joint 36 is preferably arranged offset in the sliding direction 31 with respect to the link 38 .
  • the joint 36 is deflected a maximum of 10 degrees between the releasing position and the locking position. This is made possible, among other things, by the fact that the pawl 32 is fastened to the actuating knob 30 via the joint 36 and is thereby displaced with the actuating knob 30 along the sliding direction 31 .
  • the operating knob 30 may include a support rod 44 .
  • the support rod 44 is aligned along the sliding direction 31 and suspended in a movably guided manner along the sliding direction 31 .
  • the operating knob 30 is attached at one end of the support rod 44 .
  • the actuating knob 30 is mounted on an opening 45 in the machine housing 8 .
  • the other end of the carrier rod 44 has a head 46 which is movably mounted in an eye 47 along the sliding direction 31 .
  • the eye 47 can be provided, for example, in a plate 48 perpendicular to the sliding direction 31 .
  • the pivot 36 is preferably attached between the operating knob 30 and the head 46 .
  • the head 46 can have a resilient detent 49 ( Figure 4, Figure 5 ).
  • the detent 49 creates a pressure point when the user moves the operating knob 30 between the releasing position and the locking position and vice versa.
  • the resilient detent 49 projects unloaded in relation to the hollow cross section of the eye 47 .
  • the detent 49 is deflected when the detent 49 is pushed through the eye 47 .
  • the detent 49 can pivot into a cavity 50 in the head 46 .
  • the detent 49 is biased in the cavity.
  • the prestress ensures that the eye 47 is pivoted out of the cavity, as a result of which the detent 49 projects again in relation to the hollow cross section of the eye 47 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Portable Power Tools In General (AREA)

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine, welche einen Mechanismus zum Arretieren eines Betriebstasters in einer betätigten Stellung aufweist. Eine Handwerkzeugmaschine entsprechend des Oberbegriffs des Anspruchs 1 ist bereits aus der EP 1 864 761 A1 bekannt.The present invention relates to a hand-held power tool which has a mechanism for locking an operating button in an actuated position. A hand tool according to the preamble of claim 1 is already from EP 1 864 761 A1 known.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Eine Ausführungsform einer Handwerkzeugmaschine hat einen Werkzeughalter zum Haltern eines Werkzeugs, ein Schlagwerk, einen Elektromotor zum Antreiben des Schlagwerks, einen monostabilen Betriebstaster, der eine stabile Schaltstellung und eine gedrückte Schaltstellung aufweist und eine Gerätesteuerung, welche ansprechend auf die stabile Schaltstellung den Elektromotor ausschaltet und welche ansprechend auf die gedrückte Schaltstellung den Elektromotor aktiviert. Eine Klinke ist vorgesehen, welche in einer Schwenkrichtung zwischen einer freigebenden Stellung und einer arretierenden Stellung verschwenkbar ist, wobei die Klinke in der arretierenden Stellung den monostabilen Betriebstaster in der gedrückten Schaltstellung hemmend ist. Ein Betätigungsknauf ist durch den Anwender verschiebbar in einer zu der Schwenkrichtung senkrechten Schieberichtung. Über ein Gelenk ist die Klinke an dem Betätigungsknauf angelegt. Eine Kulisse setzt eine Bewegung der Klinke längs der Schieberichtung in eine Schwenkbewegung in der Schwenkrichtung um.One embodiment of a hand-held power tool has a tool holder for holding a tool, an impact mechanism, an electric motor for driving the impact mechanism, a monostable operating button that has a stable switch position and a pressed switch position, and a device controller that switches off the electric motor in response to the stable switch position and which activated the electric motor in response to the depressed switch position. A pawl is provided which can be pivoted in a pivoting direction between a releasing position and a locking position, the pawl in the locking position inhibiting the monostable operating button in the pressed switch position. An operating knob is slidable by the user in a sliding direction perpendicular to the pivoting direction. The pawl is applied to the actuating knob via a joint. A connecting link converts a movement of the pawl along the sliding direction into a pivoting movement in the pivoting direction.

Ein Vorteil der Klinke zum Arretieren des Betriebstasters ist seine einfache Montage. Die Klinke und der zugehörige Betätigungsknauf sind eine bauliche Einheit, welche in einem einzigen Montageschritt eingebaut werden kann. Die zugehörige Kulisse kann dabei ein Teil eines Gehäuses der Handwerkzeugmaschine oder an dem Gehäuse angeformt sein.An advantage of the latch for locking the operating button is its simple installation. The pawl and the associated operating knob are a structural unit that can be installed in a single assembly step. The associated connecting link can be part of a housing of the hand-held power tool or can be formed on the housing.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

  • Fig. 1 einen Bohrhammer
  • Fig. 2 Ruhestellung des Betriebstasters
  • Fig. 3 Arretierte Stellung des Betriebstasters
  • Fig. 4 Teildarstellung von Fig. 2
  • Fig. 5 Teildarstellung von Fig. 3
The following description explains the invention using exemplary embodiments and figures. In the figures show:
  • 1 a hammer drill
  • 2 idle position of the operating button
  • 3 Locked position of the operating button
  • 4 partial representation of 2
  • figure 5 partial representation of 3

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Elements that are the same or have the same function are indicated by the same reference symbols in the figures, unless otherwise stated.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt als Beispiel einer handgeführten Handwerkzeugmaschine schematisch einen Bohrhammer 1. Der beispielhafte Bohrhammer 1 hat einen Werkzeughalter 2, in welchen ein Werkzeug 3 eingesetzt und verriegelt werden kann. Das Werkzeug 3 ist beispielsweise ein Bohrer, ein Meißel, etc.. Die beispielhaft dargestellt Ausführungsform dreht den Werkzeughalter 2 um eine Arbeitsachse 4 und übt zugleich periodisch Schläge auf das Werkzeug längs der Arbeitsachse 4 auf. Die Handwerkzeugmaschine 1 kann einen Moduswahlschalter 5 aufweisen, welcher dem Anwender ermöglicht selektiv die Drehbewegung und selektiv den schlagenden Betrieb zu aktivieren und zu deaktivieren. Der Anwender kann die Handwerkzeugmaschine 1 mit einem monostabilen Betriebstaster 6 in Betrieb nehmen. 1 shows a hammer drill 1 as an example of a hand-held power tool. The example hammer drill 1 has a tool holder 2 in which a tool 3 can be inserted and locked. The tool 3 is, for example, a drill, a chisel, etc. The embodiment shown as an example rotates the tool holder 2 about a working axis 4 and at the same time periodically impacts the tool along the working axis 4 . The hand-held power tool 1 can have a mode selector switch 5 , which allows the user to selectively activate and deactivate the rotary movement and selectively the hammering operation. The user can start up the hand-held power tool 1 with a monostable operating button 6 .

Die Handwerkzeugmaschine 1 hat einen Handgriff 7. Der Anwender kann die Handwerkzeugmaschine 1 während des Betriebs mit dem Handgriff 7 halten und führen. Vorzugsweise ist der Betriebstaster 6 an dem Handgriff 7 derart angebracht, dass der Anwender den Betriebstaster 6 mit der den Handgriff 7 greifenden Hand betätigen kann. Der Handgriff 7 kann von einem Maschinengehäuse 8 über Dämpfelemente entkoppelt sein.The hand-held power tool 1 has a handle 7. The user can hold and guide the hand-held power tool 1 with the handle 7 during operation. The operating button 6 is preferably attached to the handle 7 in such a way that the user can actuate the operating button 6 with the hand gripping the handle 7 . The handle 7 can be decoupled from a machine housing 8 via damping elements.

Die Handwerkzeugmaschine 1 hat einen Drehantrieb 9, welcher mit dem Werkzeughalter 2 gekoppelt ist. Der Drehantrieb 9 kann unter anderem ein untersetzendes Getriebe 10, eine Rutschkupplung 11 aufweisen. Eine Abtriebswelle 12 des Drehantriebs 9 ist an den Werkzeughalter 2 angebunden. Der Drehantrieb 9 ist an einen Elektromotor 13 gekoppelt. Der Anwender kann den Elektromotor 13 durch Betätigen des Betriebstasters 6 ein- und ausschalten, wobei der Betriebstaster 6 entsprechend eine Stromversorgung des Elektromotor 13 steuert. In einer Ausführungsform kann eine Drehzahl des Elektromotors 13 über den Betriebstaster 6 eingestellt werden. Eine Gerätesteuerung 14 erfasst die Stellung des Betriebstasters 6 und steuert ansprechend den Elektromotor 13 an.The hand-held power tool 1 has a rotary drive 9 which is coupled to the tool holder 2 . The rotary drive 9 can have, among other things, a reducing gear 10 and a slipping clutch 11 . An output shaft 12 of the rotary drive 9 is connected to the tool holder 2 . The rotary drive 9 is coupled to an electric motor 13 . The user can switch the electric motor 13 on and off by pressing the operating button 6 , with the operating button 6 correspondingly controlling a power supply of the electric motor 13 . In one embodiment, a speed of the electric motor 13 can be set using the operating button 6 . A device controller 14 detects the position of the operating button 6 and controls the electric motor 13 in response.

Die Handwerkzeugmaschine 1 hat ein pneumatisches Schlagwerk 15. Das pneumatische Schlagwerk 15 hat einen Erregerkolben 16 und einen Schlagkolben 17. Der Erregerkolben 16 ist starr an den Elektromotor 13 angekoppelt. Ein Exzenterrad 18 und ein Pleuel 19 transformieren die Rotationsbewegung des Elektromotors 13 in eine translatorische Bewegung auf der Arbeitsachse 4. Der Erregerkolben 16 und der Schlagkolben 17 schließen zwischen einander eine pneumatische Kammer 20 ab. Ein radialer Abschluß der pneumatischen Kammer 20 ist bei der dargestellten Ausführungsform durch ein Führungsrohr 21 gegeben, welches zugleich den Erregerkolben 16 und den Schlagkolben führt. In anderen Ausführungsformen kann der Schlagkolben hohl ausgebildet sein und der Erregerkolben 16 ist in dem Schlagkolben geführt oder vice versa. Die in der pneumatischen Kammer 20 eingeschlossene Luft wird durch den Erregerkolben 16 komprimiert und dekomprimiert. Die Druckwechsel koppeln den Schlägerkolben an die Bewegung des Erregerkolbens 16 an, die pneumatische Kammer 20 verhält sich analog einer Feder, daher auch der Name Luftfeder. Der Schlagkolben 17 kann unmittelbar auf das Werkzeug 3 oder mittelbar über einen Döpper 22 auf das Werkzeug aufschlagen.The hand-held power tool 1 has a pneumatic impact mechanism 15. The pneumatic impact mechanism 15 has an exciter piston 16 and an impact piston 17. The exciter piston 16 is rigidly coupled to the electric motor 13 . An eccentric wheel 18 and a connecting rod 19 transform the rotational movement of the electric motor 13 into a translatory movement on the working axis 4. The exciter piston 16 and the percussion piston 17 close a pneumatic chamber 20 between one another. A radial closure of the pneumatic chamber 20 is given in the illustrated embodiment by a guide tube 21 , which at the same time guides the exciter piston 16 and the percussion piston. In other embodiments, the percussion piston can be hollow and the exciter piston 16 is guided in the percussion piston or vice versa. The air trapped in the pneumatic chamber 20 is compressed and decompressed by the exciter piston 16 . The pressure changes couple the hammer piston to the movement of the exciter piston 16 , the pneumatic chamber 20 behaves in the same way as a spring, hence the name air spring. The percussion piston 17 can strike the tool 3 directly or indirectly via a snap die 22 on the tool.

Die Handwerkzeugmaschine 1 wird durch den Betriebstaster 6 ein- und ausgeschaltet. Der Betriebstaster 6 ist in dem Handgriff 7 angeordnet. Der Betriebstaster 6 hat eine Schaltkappe 23, welche der Anwender greifen kann. Die Schaltkappe 23 steht in einer Ruhestellung des Betriebstasters 6 von dem Handgriff 7 entgegen einer Schaltrichtung 24 vor (Fig. 2). Die Schaltkappe 23 liegt vorzugsweise an einem Anschlag 25 des Maschinengehäuses 8 an. Der Anwender kann die Schaltkappe 23 in Schaltrichtung 24 in eine gedrückte Schaltstellung drücken (Fig. 3). Die Schaltkappe 23 kann dabei in den Handgriff 7 gleiten oder einschwenken. Die Schaltkappe 23 kann wie in dem dargestellten Beispiel dargestellt um einen Lagerpunkt schwenkbar oder linear geführt sein. Die Schaltkappe 23 ist entfernt von dem Anschlag 25. Die Schaltkappe 23 ist durch ein Rückstellelement 26, z.B. eine Schraubenfeder, mit einer Kraft beaufschlagt, welche entgegen der Schaltrichtung 24 wirkt. Das Rückstellelement 26 ist in der gedrückten Schaltstellung stärker gespannt als in der Ruhestellung, wodurch die Schaltkappe 23 nur in der Ruhestellung stabil ist. Die Schaltkappe 23 kehrt in die Ruhestellung zurück, wenn der Anwender die Schaltkappe 23 loslässt. Die Schaltrichtung 24 ist vorzugsweise antiparallel zu der Arbeitsrichtung 27 in welche das Werkzeug 3 weist.The handheld power tool 1 is switched on and off by the operating button 6 . The operating button 6 is arranged in the handle 7 . The operating button 6 has a switching cap 23 which the user can grip. When the operating button 6 is in a rest position, the switching cap 23 protrudes from the handle 7 counter to a switching direction 24 ( 2 ). The switching cap 23 is preferably in contact with a stop 25 of the machine housing 8 . The user can press the switching cap 23 in the switching direction 24 into a pressed switching position ( 3 ). The switch cap 23 can slide or pivot into the handle 7 . The switching cap 23 can, as shown in the example shown, be pivotable or linearly guided about a bearing point. The switching cap 23 is at a distance from the stop 25. The switching cap 23 is acted upon by a restoring element 26, for example a helical spring, with a force which acts counter to the switching direction 24 . The restoring element 26 is more tensioned in the depressed switch position than in the rest position, as a result of which the switch cap 23 is only stable in the rest position. The switch cap 23 returns to the rest position when the user releases the switch cap 23 . The switching direction 24 is preferably antiparallel to the working direction 27 in which the tool 3 points.

Die Schaltkappe 23 ist mit einem Schaltmechanismus 28 des Betriebstasters 6 gekoppelt. Der Schaltmechanismus 28 deaktiviert den Elektromotor 13, wenn die Schaltkappe 23 in der Ruhestellung ist. Der Schaltmechanismus 28 aktiviert den Elektromotor 13, wenn die Schaltkappe 23 in der gedrückten Stellung ist. Der Schaltmechanismus 28 kann einen elektromechanischen, optischen, magnetischen oder anderen Sensor zum Bestimmen der Stellung der Schaltkappe 23 beinhalten. Der Schaltmechanismus 28 kann in einer Ausführung eine Drehzahl oder Leistungsaufnahme des Elektromotors 13 in Abhängigkeit unterschiedlich stark gedrückter Stellungen einstellen.The switching cap 23 is coupled to a switching mechanism 28 of the operating button 6 . The switching mechanism 28 deactivates the electric motor 13 when the switching cap 23 is in the rest position. The switch mechanism 28 activates the electric motor 13 when the switch cap 23 is in the depressed position. The switching mechanism 28 can a electromechanical, optical, magnetic or other sensor for determining the position of the switch cap 23 include. In one embodiment, the switching mechanism 28 can set a speed or power consumption of the electric motor 13 as a function of positions that are pressed to different degrees.

Die Handwerkzeugmaschine 1 hat einen Arretierschalter 29. Der Arretierschalter hat eine freigebende Stellung (Fig. 2) und eine arretierende Stellung (Fig. 3).The hand-held power tool 1 has a locking switch 29. The locking switch has a release position ( 2 ) and a locking position ( 3 ).

Der Arretierschalter 29 hat einen Betätigungsknauf 30, welcher von dem Anwender greifbar ist. Der Anwender kann den Betätigungsknauf 30 zwischen einer ersten Stellung und einer zweiten Stellung in Schieberichtung 31 verschieben. Die erste Stellung ist mit der freigebenden Stellung des Arretierschalters 29 und die zweite Stellung ist mit der arretierenden Stellung des Arretierschalters 29 assoziiert. Die Schieberichtung 31 ist vorzugsweise antiparallel zu der Schaltrichtung 24 des Betriebstasters 6. The lock switch 29 has an operating knob 30 which is grippable by the user. The user can move the actuating knob 30 between a first position and a second position in the sliding direction 31 . The first position is associated with the release position of the lock switch 29 and the second position is associated with the locking position of the lock switch 29 . The sliding direction 31 is preferably antiparallel to the switching direction 24 of the operating button 6.

Der Arretierschalter 29 hat eine schwenkbare Klinke 32, welche in der arretierenden Stellung in die Schaltkappe 23 eingreift. Die Klinke 32 hemmt die Bewegung der Schaltkappe 23 entgegen der Schaltrichtung 24 und somit die Rückkehr der Schaltkappe 23 in die Ruhestellung. Der Betriebstaster 6 verharrt in der gedrückten Schaltstellung. Der Elektromotor 13 bleibt aktiviert, selbst wenn der Anwender die Schaltkappe 23 loslässt.The locking switch 29 has a pivotable pawl 32 which engages in the switching cap 23 in the locking position. The pawl 32 inhibits the movement of the switching cap 23 against the switching direction 24 and thus the return of the switching cap 23 to the rest position. The operating button 6 remains in the pressed switch position. The electric motor 13 remains activated even if the user releases the switch cap 23 .

Die Klinke 32 interagiert mit der Schaltkappe 23. Die Schaltkappe 23 hat eine Sperrfläche 33, an welcher die Klinke 32 in der arretierenden Stellung anliegen kann. Die Sperrfläche 33 kann durch die Außenkontur der Schaltkappe 23 oder durch eine von außen zugängliche Rippe oder ähnliches realisiert sein. Die Sperrfläche 33 ist vorzugsweise weitgehend senkrecht zu der Schaltrichtung 24. Die Sperrfläche 33 weist entgegen die Schaltrichtung 24 und hin zu der Klinke 32. The pawl 32 interacts with the switch cap 23. The switch cap 23 has a locking surface 33 against which the pawl 32 can rest in the locked position. The blocking surface 33 can be realized by the outer contour of the switching cap 23 or by a rib or the like that is accessible from the outside. The blocking surface 33 is preferably largely perpendicular to the switching direction 24. The blocking surface 33 points in the opposite direction to the switching direction 24 and towards the pawl 32.

Die Klinke 32 ist in einer Schwenkrichtung 34 schwenkbar, welche senkrecht zu der Schaltrichtung 24 ist. Die Klinke 32 kann zwischen einer ersten Stellung, welche mit der freigebenden Stellung assoziiert ist, und einer zweiten Stellung, welche mit der arretierenden Stellung assoziiert ist, in Schaltrichtung 24 verschwenkt werden. Die Klinke 32 ist in der freigebenden Stellung ohne Überlapp mit der Sperrfläche 33. Der Überlapp bezieht sich auf die Schaltrichtung 24, d.h. der Überlapp kann in der Projektion auf eine Ebene senkrecht zu der Schaltrichtung 24 bestimmt werden. Die Klinke 32 ist in der arretierenden Stellung mit dem Anschlag 33 überlappend. Eine Spitze 35 der Klinke 32 liegt in Schaltrichtung 24 an der Sperrfläche 33 an. Die Spitze 35 übt analog der greifenden Hand eine Gegenkraft zu dem Rückstellelement aus, wodurch der Betriebstaster 6 gedrückt bliebt.The pawl 32 can be pivoted in a pivoting direction 34 which is perpendicular to the switching direction 24 . The pawl 32 can be pivoted in the shifting direction 24 between a first position associated with the releasing position and a second position associated with the locking position. The pawl 32 is in the releasing position without overlapping with the blocking surface 33. The overlap relates to the switching direction 24, ie the overlap can be determined in the projection onto a plane perpendicular to the switching direction 24 . The latch 32 overlaps the stop 33 in the locked position. A tip 35 of the pawl 32 is in the switching direction 24 on the Blocking surface 33 on. The tip 35 exerts a counterforce to the restoring element, analogously to the gripping hand, as a result of which the operating button 6 remains pressed.

Die Position der Spitze 35 längs der Schaltrichtung 24 entspricht der Position des Anschlags 33 längs der Schaltrichtung 24 bei gedrücktem Betriebstaster 6. Die Spitze 35 kann über den Anschlag 33 in Schaltrichtung 24 hinausragen, wenn der Betriebstaster 6 in der Ruhestellung ist. Der Arretierschalter 29 ist bei der ausgeschalteten Handwerkzeugmaschine 1 funktionslos.The position of the tip 35 along the switching direction 24 corresponds to the position of the stop 33 along the switching direction 24 when the operating button 6 is pressed. The tip 35 can protrude beyond the stop 33 in the switching direction 24 when the operating button 6 is in the rest position. The locking switch 29 has no function when the handheld power tool 1 is switched off.

Die Klinke 32 ist federnd an dem Betätigungsknauf 30 befestigt. Ein Gelenk 36 verbindet den Betätigungsknauf 30 und die Klinke 32. Das Gelenk 36 ist um eine Achse 37 schwenkbar, welche senkrecht zu der Schwenkrichtung 34 ist. Das Gelenk 36 ist vorzugsweise als Festkörpergelenk ausgebildet. Das Gelenk 36 besteht aus dem gleichen Material wie die Klinke 32 und vorzugsweise wie der Betätigungsknauf 30. Das Gelenk 36 hat eine geringere Steifigkeit als die Klinke 32 in der Schwenkrichtung 34. Die geringe Steifigkeit ist durch einen geringe Dicke, d.h. geringere Abmessung längs der Schwenkrichtung 34, realisiert. Das Gelenk 36 lässt sich soweit reversibel, ggf. elastisch, verformen, dass die Klinke 32 zwischen der arretierenden und freigebenden Stellung verschwenkbar ist. Vorzugsweise ist das Gelenk 36 in der arretierenden Stellung verspannt und in der freigebenden Stellung kraftfrei.The pawl 32 is resiliently attached to the operating knob 30 . A hinge 36 connects the operating knob 30 and the pawl 32. The hinge 36 is pivotable about an axis 37 which is perpendicular to the pivoting direction 34 . The joint 36 is preferably designed as a solid joint. The hinge 36 is made of the same material as the pawl 32 and preferably as the operating knob 30. The hinge 36 has less rigidity than the pawl 32 in the pivoting direction 34. The low rigidity is due to a small thickness, ie smaller dimension along the pivoting direction 34, realized. The joint 36 can be reversibly, possibly elastically, deformed to such an extent that the pawl 32 can be pivoted between the locking and releasing position. The joint 36 is preferably clamped in the locking position and free of force in the releasing position.

Eine Kulisse 38 verschwenkt die Klinke 32 ansprechend auf die Stellung des Betätigungsknaufs 30. Die Kulisse 38 enthält eine geneigt verlaufende Schiene 39 an dem Maschinengehäuse 8. Die Schiene 39 steigt entlang der Schieberichtung 31 in Schwenkrichtung 34 an. Die Schiene 39 hat, bezogen auf die Schwenkrichtung 34, eine untere Führungsfläche 40 und eine obere Führungsfläche 41. Die untere Führungsfläche 40 ist in dem Beispiel dem Betätigungsknauf 30 zugewandt; die obere Führungsfläche 42 ist von dem Betätigungsknauf 30 abgewandt. Die Klinke 32 hat einen unteren Finger 42, welcher an der unteren Führungsfläche 40 läuft, und einen oberen Finger 43, welcher an der oberen Führungsfläche 42 läuft. Bei einer Bewegung der Betätigungsknaufs 30 in Schieberichtung 31 zieht der obere Finger 43, um der oberen Führungsfläche 41 zu folgen, die Klinke 32 in die Schwenkrichtung 34. Bei einer Bewegung entgegen der Schieberichtung 31 drückt der untere Finger 42, um der unteren Führungsfläche 40 zu folgen, die Klinke 32 entgegen der Schwenkrichtung 34. A link 38 pivots the pawl 32 in response to the position of the operating knob 30. The link 38 includes an inclined rail 39 on the machine housing 8. The rail 39 rises along the sliding direction 31 in the pivoting direction 34 . The rail 39 has, in relation to the pivoting direction 34, a lower guide surface 40 and an upper guide surface 41. In the example, the lower guide surface 40 faces the actuating knob 30 ; the upper guide surface 42 faces away from the operating knob 30 . The pawl 32 has a lower finger 42 which rides on the lower guide surface 40 and an upper finger 43 which rides on the upper guide surface 42 . When the actuating knob 30 moves in the sliding direction 31 , the upper finger 43 pulls the pawl 32 in the pivoting direction 34 in order to follow the upper guide surface 41. In the event of a movement counter to the sliding direction 31 , the lower finger 42 presses in order to close the lower guide surface 40 follow, the pawl 32 counter to the pivoting direction 34.

Das Gelenk 36 ist vorzugsweise gegenüber der Kulisse 38 in Schieberichtung 31 versetzt angeordnet. Das Gelenk 36 wird um maximal 10 Grad zwischen der freigebenden Stellung und der arretierenden Stellung ausgelenkt. Dies ist unter Anderem dadurch ermöglicht, dass die Klinke 32 über das Gelenk 36 an dem Betätigungsknauf 30 befestigt und dadurch mit dem Betätigungsknauf 30 längs der Schieberichtung 31 verschoben wird.The joint 36 is preferably arranged offset in the sliding direction 31 with respect to the link 38 . The joint 36 is deflected a maximum of 10 degrees between the releasing position and the locking position. This is made possible, among other things, by the fact that the pawl 32 is fastened to the actuating knob 30 via the joint 36 and is thereby displaced with the actuating knob 30 along the sliding direction 31 .

Der Betätigungsknauf 30 kann eine Trägerstange 44 aufweisen. Die Trägerstange 44 ist längs der Schieberichtung 31 ausgerichtet und längs der Schieberichtung 31 beweglich geführt aufgehängt. An einem Ende der Trägerstange 44 ist der Betätigungsknauf 30 befestigt. Der Betätigungsknauf 30 ist an einem Durchbruch 45 in dem Maschinengehäuse 8 gelagert. Das andere Ende der Trägerstange 44 hat einen Kopf 46, welcher in einem Auge 47 längs der Schieberichtung 31 beweglich gelagert ist. Das Auge 47 kann beispielsweise in einer zu der Schieberichtung 31 senkrechten Platte 48 vorgesehen sein. Das Gelenk 36 ist vorzugsweise zwischen dem Betätigungsknauf 30 und dem Kopf 46 angebracht.The operating knob 30 may include a support rod 44 . The support rod 44 is aligned along the sliding direction 31 and suspended in a movably guided manner along the sliding direction 31 . At one end of the support rod 44 , the operating knob 30 is attached. The actuating knob 30 is mounted on an opening 45 in the machine housing 8 . The other end of the carrier rod 44 has a head 46 which is movably mounted in an eye 47 along the sliding direction 31 . The eye 47 can be provided, for example, in a plate 48 perpendicular to the sliding direction 31 . The pivot 36 is preferably attached between the operating knob 30 and the head 46 .

Der Kopf 46 kann eine federnde Rastnase 49 aufweisen (Fig. 4, Fig. 5). Die Rastnase 49 erzeugt einen Druckpunkt, wenn der Anwender den Betätigungsknauf 30 zwischen der freigebenden Stellung und der arretierenden Stellung und vice versa bewegt. Die federnde Rastnase 49 steht unbelastet gegenüber dem hohlen Querschnitt des Auges 47 vor. Die Rastnase 49 wird ausgelenkt, wenn die Rastnase 49 durch das Auge 47 geschoben wird. Die Rastnase 49 kann in einen Hohlraum 50 in dem Kopf 46 einschwenken. Die Rastnase 49 ist in dem Hohlraum vorgespannt. Auf der anderen Seite des Auges 47 sorgt die Vorspannung für ein Ausschwenken aus dem Hohlraum, wodurch die Rastnase 49 wieder gegenüber dem hohlen Querschnitt des Auges 47 vorsteht.The head 46 can have a resilient detent 49 ( Figure 4, Figure 5 ). The detent 49 creates a pressure point when the user moves the operating knob 30 between the releasing position and the locking position and vice versa. The resilient detent 49 projects unloaded in relation to the hollow cross section of the eye 47 . The detent 49 is deflected when the detent 49 is pushed through the eye 47 . The detent 49 can pivot into a cavity 50 in the head 46 . The detent 49 is biased in the cavity. On the other side of the eye 47 , the prestress ensures that the eye 47 is pivoted out of the cavity, as a result of which the detent 49 projects again in relation to the hollow cross section of the eye 47 .

Claims (6)

  1. Handheld power tool comprising
    a tool holder (2) for holding a tool (3),
    a percussion mechanism (15),
    an electric motor (13) for driving the percussion mechanism (15),
    a monostable operating button (6) which has a stable switching position and a pressed switching position,
    a device controller which switches off the electric motor (13) in response to the stable switching position and which activates the electric motor (13) in response to the pressed switching position,
    a catch (32) which can be pivoted between a releasing position and a locking position in a pivoting direction (34), wherein the catch (32), in the locking position, stops the monostable operating button (6) in the pressed switching position,
    an operating knob (30) which can be moved by the user in a shifting direction (31) which is perpendicular to the pivoting direction (34),
    characterized by a joint (36) by means of which the catch (32) is connected to the operating knob (30), and a slotted link (38) which is converting a movement of the catch (32) along the shifting direction (31) into a pivoting movement in the pivoting direction (34).
  2. Handheld power tool (1) according to Claim 1, characterized in that the slotted link (38) has a rail (39) which is arranged on a machine housing (8), wherein the rail (39) is inclined in relation to the shifting direction (31), and at least one finger (42), which rests on the rail (39), is provided on the catch (32).
  3. Handheld power tool (1) according to either of the preceding claims, characterized in that the joint (36) can be pivoted about an axis which is perpendicular to the plane which is spanned by the shifting direction (31) and the pivoting direction (34).
  4. Handheld power tool (1) according to one of the preceding claims, characterized in that the joint (36) is a flexure bearing which consists of the same material as the operating knob (30).
  5. Handheld power tool (1) according to one of the preceding claims, characterized by a carrier rod (44) which is guided such that it moves along the shifting direction (31), the operating knob (30) being guided at one end of said carrier rod and the other end of said carrier rod being guided in an eyelet (47), and wherein the joint (36) is arranged on the carrier rod (44) between the two ends.
  6. Handheld power tool (1) according to Claim 5, characterized in that a resilient latching lug (49) is provided at the other end, said latching lug protruding in relation to the hollow cross section of the eyelet (47) in the unloaded state.
EP19733537.5A 2018-07-11 2019-07-02 Handheld machine tool Active EP3820651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18182872.4A EP3593951A1 (en) 2018-07-11 2018-07-11 Handheld machine tool
PCT/EP2019/067696 WO2020011595A1 (en) 2018-07-11 2019-07-02 Hand-held power tool

Publications (2)

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EP3820651A1 EP3820651A1 (en) 2021-05-19
EP3820651B1 true EP3820651B1 (en) 2022-06-08

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EP18182872.4A Withdrawn EP3593951A1 (en) 2018-07-11 2018-07-11 Handheld machine tool
EP19733537.5A Active EP3820651B1 (en) 2018-07-11 2019-07-02 Handheld machine tool

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US (1) US11958175B2 (en)
EP (2) EP3593951A1 (en)
CN (1) CN112262020B (en)
WO (1) WO2020011595A1 (en)

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USD1034128S1 (en) * 2022-02-07 2024-07-09 Robert Bosch Gmbh Hammer drill

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Publication number Publication date
CN112262020B (en) 2023-04-21
US20210114196A1 (en) 2021-04-22
CN112262020A (en) 2021-01-22
WO2020011595A1 (en) 2020-01-16
US11958175B2 (en) 2024-04-16
EP3593951A1 (en) 2020-01-15
EP3820651A1 (en) 2021-05-19

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