EP0224010A1 - Portable power-actuated tool for drilling with or without percussion - Google Patents

Portable power-actuated tool for drilling with or without percussion Download PDF

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Publication number
EP0224010A1
EP0224010A1 EP86114378A EP86114378A EP0224010A1 EP 0224010 A1 EP0224010 A1 EP 0224010A1 EP 86114378 A EP86114378 A EP 86114378A EP 86114378 A EP86114378 A EP 86114378A EP 0224010 A1 EP0224010 A1 EP 0224010A1
Authority
EP
European Patent Office
Prior art keywords
hand tool
push button
drill
torque
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.)
Granted
Application number
EP86114378A
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German (de)
French (fr)
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EP0224010B1 (en
Inventor
Karl Dr.-Ing. Wanner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0224010A1 publication Critical patent/EP0224010A1/en
Application granted granted Critical
Publication of EP0224010B1 publication Critical patent/EP0224010B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/003—Clutches specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/255—Switches
    • B25D2250/265—Trigger mechanism in handle

Definitions

  • the invention is based on a motor-driven hand tool according to the preamble of the main claim.
  • a hand tool is already known from DE-AS 22 29 388, but in which an additional handle for the hand tool is required to change the transmission torque.
  • One-handed drilling or impact drilling is therefore not possible.
  • switching the transmission torque with the additional handle requires a switching movement transverse to the longitudinal axis of the drill. This results in an undesirable cross loading of the drill and destabilizes the position of the hand tool in the operator's hands.
  • the hand tool according to the invention with the characterizing features of the main claim has the advantage lighter, even one-handed handling without atypical loading of the drill. Because of the pressure button in the grip area of the hand that also operates the pushbutton for the on and off switch for the hand tool, one-handed switching of the torque transmitted to the drill is possible without generating forces across the drill. In addition, the electromagnetically amplifiable driving force of the torque clutch means that no significantly increased actuation force is required. The position of the coupling within the housing of the hand tool remains independent of the position of the handle. This facilitates a compact construction, in which no empty spaces should arise in the housing if possible.
  • FIG. 1 An embodiment of the subject of the invention is shown in the drawing and explained in more detail in the following description.
  • the figure shows a partially longitudinally cut rotary hammer which is designed according to the invention.
  • a striking mechanism and a gear 5 for rotating drive are arranged in a housing 1 of a rotary hammer, which has a tool holder 2 and a handle.
  • a motor pinion 6 drives both a bushing 8 of a swash plate transmission and a spindle 9 via a gearwheel 7.
  • the drive for the socket 8 can optionally be switched on or off via a ball coupling 10.
  • This ball coupling is actuated by a bolt 11, the position of which can be selected in a known manner by means of a handle 12.
  • the rotation of the spindle 9 is transmitted through its pinion 13 to a gear 14.
  • the gear 14 is mounted concentrically to the tool holder 2 on a cylinder 15 which is part of the striking mechanism 4.
  • This cylinder 15 is designed in a known manner, not shown here, for the rotary driving of a drill 16 held in the tool holder 2.
  • the rotary movement of the gear wheel 14 is transmitted to the cylinder 15 by a clutch 17.
  • the clutch 17 is designed as a safety clutch that limits the torque transmitted.
  • the size of the torque transmitted here depends on the force with which a helical spring 18 urges the gearwheel 14 into the coupling position with the cylinder 15.
  • An electromagnet 19 which is mounted on the housing is arranged opposite the end face of the gearwheel 14 which faces away from the helical spring 18. It can be connected to voltage via leads 20 and 21 by means of a switch which can be actuated by a pushbutton 22.
  • a pushbutton is assigned to the pushbutton 22, which can be removed from its locked position with respect to the pushbutton 22 by means of a pushbutton 23. The pushbutton 22 is therefore locked against unintentional pressing when the pushbutton 23 is not actuated.
  • the push button 22 is below a conventional push button 24 for actuating the on and off switch for the motor of the hand tool. This push button 24 can be fixed in a known manner by means of a push button 25 in its switched-on position.
  • the usual transmission torque is initially used, the size of which is determined by the pressure of the helical spring 18. If, for example, the drill 16 hits a reinforcing iron while it is in operation, it can jam in the borehole. A higher driving torque is required to drill through this reinforcing iron.
  • the operator consciously adjusts to this situation and first presses the pushbutton 23 and then the pushbutton 22 released in this way.
  • the switch 19 operated with this pushbutton 22 energizes the electromagnet 19.
  • the magnetic field thus built up pulls the gearwheel 14 into the clutch engagement with the clutch 17 with increased force.
  • the driving torque of this clutch is thus increased in the desired manner.
  • the power supply for the electromagnet 19 is turned off.
  • the old transmission torque, determined by the helical spring 18, is established on the clutch 17.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Es wird ein motorisch angetriebenes Handwerkzeug für bohrenden oder schlagbohrenden Betrieb vorgeschlagen. Dieses Handwerkzeug (1) besitzt eine Sicherheitskupplung (17) zur Begrenzung des auf den Bohrer (16) übertragenen Drehmoments. Für Sonderfälle, z.B. auftreffen des Bohrers (16) auf ein Armierungseisen, soll das Übertragungsdrehmoment willkürlich erhöht werden können. Dabei soll das Handwerkzeug (1) einhändig bedienbar bleiben und sollen untypische Belastungen des Bohrers (16) quer zur Bohrerachse vermieden werden. Dies wird erreicht mittels einer weiteren Drucktaste (22) im Griffbereich der den Ein- und Ausschalter des Handwerkzeugmotors betätigenden Hand und durch eine elektromagnetisch beeinflußbare Kupplung (17) zum Übertragen des Drehmoments vom Motor des Handwerkzeugs (1) auf den Bohrer (16).A motor-driven hand tool for drilling or impact drilling operation is proposed. This hand tool (1) has a safety coupling (17) to limit the torque transmitted to the drill (16). For special cases, e.g. If the drill (16) hits a reinforcing iron, the transmission torque should be able to be increased arbitrarily. The hand tool (1) should remain operable with one hand and atypical loads on the drill (16) transverse to the drill axis should be avoided. This is achieved by means of a further push button (22) in the grip area of the hand operating the on and off switch of the hand tool motor and by an electromagnetically influenceable coupling (17) for transmitting the torque from the motor of the hand tool (1) to the drill (16).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem motorisch getriebenen Handwerkzeug nach der Gattung des Hauptanspruchs. Es ist schon ein solches Handwerkzeug bekannt aus der DE-AS 22 29 388, bei dem jedoch eine zusätzliche Handhabe für das Handwerkzeug zur Veränderung des Übertragungsdrehmoments erforderlich ist. Einhändiges Bohren bzw. Schlagbohren ist somit nicht möglich. Zudem erfordert das Umschalten des Übertragungsdrehmoments mit dem Zusatzhandgriff eine Schaltbewegung quer zur Bohrerlängsachse. Das hat eine unerwünschte Querbelastung des Bohrers zur Folge und destabilisiert die Lage des Handwerkzeugs in den Händen des Bedienenden.The invention is based on a motor-driven hand tool according to the preamble of the main claim. Such a hand tool is already known from DE-AS 22 29 388, but in which an additional handle for the hand tool is required to change the transmission torque. One-handed drilling or impact drilling is therefore not possible. In addition, switching the transmission torque with the additional handle requires a switching movement transverse to the longitudinal axis of the drill. This results in an undesirable cross loading of the drill and destabilizes the position of the hand tool in the operator's hands.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Handwerkzeug mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil leichter, auch einhändiger Handhabung ohne untypische Belastung des Bohrers. Durch die Drucktaste im Griffbereich der auch die Drucktaste für den Ein- und Ausschalter für das Handwerkzeug bedienenden Hand, ist einhändiges Umschalten des auf den Bohrer übertragenen Drehmoments ohne das Erzeugen von Kräften quer zum Bohrer möglich. Außerdem ist durch die elektromagnetisch verstärkbare Mitnahmekraft der Drehmomentkupplung keine wesentlich erhöhte Betätigungskraft erforderlich. Die Lage der Kupplung innerhalb des Gehäuses des Handwerkzeuges bleibt unabhängig von der Lage der Handhabe. Das erleichtert eine kompakte Konstruktion, bei der möglichst keine Leerräume im Gehäuse entstehen sollen.The hand tool according to the invention with the characterizing features of the main claim has the advantage lighter, even one-handed handling without atypical loading of the drill. Because of the pressure button in the grip area of the hand that also operates the pushbutton for the on and off switch for the hand tool, one-handed switching of the torque transmitted to the drill is possible without generating forces across the drill. In addition, the electromagnetically amplifiable driving force of the torque clutch means that no significantly increased actuation force is required. The position of the coupling within the housing of the hand tool remains independent of the position of the handle. This facilitates a compact construction, in which no empty spaces should arise in the housing if possible.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Handwerkzeugs möglich. Besonders vorteilhaft und sicherheitsfördernd sind die beim Loslassen selbsttätig in ihre Ruhestellung zurückkehrende Drucktaste und das Sperrglied für diese Drucktaste. Durch diese Maßnahmen kann ein ungewolltes Erhöhen des Übertragungsdrehmoment oder Beibehalten des erhöhten Übertragungsdrehmoments vermieden werden.Advantageous further developments and improvements of the hand tool specified in the main claim are possible through the measures listed in the subclaims. Particularly advantageous and safety-promoting are the pushbutton that automatically returns to its rest position when released and the locking element for this pushbutton. These measures prevent an undesired increase in the transmission torque or maintenance of the increased transmission torque.

Zeichnungdrawing

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt einen teilweise längsgeschnittenen Bohrhammer der nach der Erfindung gestaltet ist.An embodiment of the subject of the invention is shown in the drawing and explained in more detail in the following description. The figure shows a partially longitudinally cut rotary hammer which is designed according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In einem Gehäuse 1 eines Bohrhammers, der eine Werkzeugaufnahme 2 und einen Handgriff besitzt, sind ein Schlagwerk und ein Getriebe 5 für drehenden Antrieb angeordnet. Ein Motoritzel 6 treibt über ein Zahnrad 7 sowohl eine Buchse 8 eines Taumelscheibengetriebes als auch eine Spindel 9 an. Dabei ist der Antrieb für die Buchse 8 wahlweise über eine Kugelkupplung 10 zu- oder abschaltbar. Betätigt wird diese Kugelkupplung durch einen Bolzen 11, dessen Stellung durch eine Handhabe 12 in bekannter Weise wählbar ist. Die Drehbewegung der Spindel 9 wird durch deren Ritzel 13 auf ein Zahnrad 14 übertragen. Das Zahnrad 14 lagert konzentrisch zur Werkzeugaufnahme 2 auf einem Zylinder 15, der Teil des Schlagwerkes 4 ist. Dieser Zylinder 15 ist in bekannter, hier nicht näher dargestellter Weise ausgebildet, zur Drehmitnahme eines in der Werkzeugaufnahme 2 gehaltenen Bohrers 16. Durch eine Kupplung 17 wird die Drehbewegung des Zahnrades 14 auf den Zylinder 15 übertragen. Die Kupplung 17 ist als das übertragene Drehmoment begrenzende Sicherheitkupplung ausgebildet. Die Größe des hier übertragenen Drehmcments ist abhängig von der Kraft, mit der eine Schraubenfeder 18 das Zahnrad 14 in die Kupplungsstellung mit dem Zylinder 15 drängt. Ein gehäusefest gelagerter Elektromagnet 19 ist gegenüber der von der Schraubenfeder 18 abgewendeten Stirnfläche des Zahnrads 14 angeordnet. Er kann über Zuleitungen 20 und 21 mittels eines Schalters an Spannung gelegt werden, der durch eine Drucktaste 22 betätigbar ist. Durch die gewählte Anordnung des Elektromagneten 19 zum Zahnrad 14 kann dieser Elektromagnet 19 die Kraft erhöhen, mit der das Zahnrad 14 gegen die Kupplung 17 gepreßt wird. Damit läßt sich das mittels der Schraubenfeder 18 erzeugte Übertragungsdrehmoment wesentlich erhöhen. Im Extremfalle kann eine starre Verbindung zwischen dem Zahnrad 14 und dem Zylinder 15 hergestellt werden. Der Drucktaste 22 ist ein Sperrglied zugeordnet, das mittels eines Druckknopfes 23 aus seiner Sperrstellung gegenüber der Drucktaste 22 entfernt werden kann. Die Drucktaste 22 ist also bei nichtbetätigtem Druckknopf 23 gegen unbeabsichtigtes Eindrücken gesperrt. Die Drucktaste 22 liegt unterhalb einer üblichen Drucktaste 24 zum Betätigen des Ein- und Ausschalters für den Motor des Handwerkzeuges. Diese Drucktaste 24 ist in bekannter Weise mittels eines Druckknopfes 25 in ihrer Einschaltstellung festlegbar.In a housing 1 of a rotary hammer, which has a tool holder 2 and a handle, a striking mechanism and a gear 5 for rotating drive are arranged. A motor pinion 6 drives both a bushing 8 of a swash plate transmission and a spindle 9 via a gearwheel 7. The drive for the socket 8 can optionally be switched on or off via a ball coupling 10. This ball coupling is actuated by a bolt 11, the position of which can be selected in a known manner by means of a handle 12. The rotation of the spindle 9 is transmitted through its pinion 13 to a gear 14. The gear 14 is mounted concentrically to the tool holder 2 on a cylinder 15 which is part of the striking mechanism 4. This cylinder 15 is designed in a known manner, not shown here, for the rotary driving of a drill 16 held in the tool holder 2. The rotary movement of the gear wheel 14 is transmitted to the cylinder 15 by a clutch 17. The clutch 17 is designed as a safety clutch that limits the torque transmitted. The size of the torque transmitted here depends on the force with which a helical spring 18 urges the gearwheel 14 into the coupling position with the cylinder 15. An electromagnet 19 which is mounted on the housing is arranged opposite the end face of the gearwheel 14 which faces away from the helical spring 18. It can be connected to voltage via leads 20 and 21 by means of a switch which can be actuated by a pushbutton 22. Due to the selected arrangement of the electromagnet 19 to the gear 14, this electromagnet 19 can the force increase with which the gear 14 is pressed against the clutch 17. The transmission torque generated by means of the helical spring 18 can thus be significantly increased. In extreme cases, a rigid connection between the gear 14 and the cylinder 15 can be made. A pushbutton is assigned to the pushbutton 22, which can be removed from its locked position with respect to the pushbutton 22 by means of a pushbutton 23. The pushbutton 22 is therefore locked against unintentional pressing when the pushbutton 23 is not actuated. The push button 22 is below a conventional push button 24 for actuating the on and off switch for the motor of the hand tool. This push button 24 can be fixed in a known manner by means of a push button 25 in its switched-on position.

Beim Arbeiten mit diesem Bohrhammer wird zunächst mit dem üblichen Übertragungsdrehmoment gearbeitet, dessen Größe vom Druck der Schraubenfeder 18 bestimmt ist. Trifft nun beispielsweise der Bohrer 16 während es Betriebs auf ein Armierungseisen, kann er sich im Bohrloch verklemmen. Zum Durchbohren dieses Armierungseisens wird ein höheres Mitnahmedrehmoment benötigt. Der Bedienende stellt sich bewußt auf diese Situation ein und betätigt zunächst den Druckknopf 23 und danach die so freigegebene Drucktaste 22. Über den mit dieser Drucktaste 22 betätigten Schalter wird der Elektromagnet 19 an Spannung gelegt. Das damit aufgebaute Magnetfeld zieht das Zahnrad 14 mit verstärkter Kraft in den Kupplungseingriff mit der Kupplung 17. Das Mitnahmedrehmoment dieser Kupplung ist so in der gewünschten Weise erhöht. Sobald die Drucktaste 22 losgelassen wird, wird auch die Stromversorgung für den Elektromagneten 19 abgeschaltet. Es stellt sich das alte, durch die Schraubenfeder 18 bestimmte Übertragungsdrehmoment an der Kupplung 17 ein.When working with this rotary hammer, the usual transmission torque is initially used, the size of which is determined by the pressure of the helical spring 18. If, for example, the drill 16 hits a reinforcing iron while it is in operation, it can jam in the borehole. A higher driving torque is required to drill through this reinforcing iron. The operator consciously adjusts to this situation and first presses the pushbutton 23 and then the pushbutton 22 released in this way. The switch 19 operated with this pushbutton 22 energizes the electromagnet 19. The magnetic field thus built up pulls the gearwheel 14 into the clutch engagement with the clutch 17 with increased force. The driving torque of this clutch is thus increased in the desired manner. As soon as the push button 22 is released is left, the power supply for the electromagnet 19 is turned off. The old transmission torque, determined by the helical spring 18, is established on the clutch 17.

Claims (8)

1. Motorisch angetriebenes Handwerkzeug für bohrenden oder schlagbohrenden Betrieb, mit einer das übertragene Drehmoment begrenzenden Sicherheitskupplung, bei dem das vom Handwerkzeug auf den Bohrer übertragbare Grenzdrehmoment mittels einer zusätzlichen Handhabe verstellbar ist, dadurch gekennzeichnet, daß es eine Drucktaste (22) zum Betätigen der Vorrichtung (19) zum Verstellen des Grenzdrehmoments hat, die im Griffbereich der auch die Drucktaste (24) für den Ein- und Ausschalter für den Motor des Handverkzeugs (1) bedienden Hand des Benutzers liegt.1. Motor-driven hand tool for drilling or impact drilling operation, with a safety clutch limiting the transmitted torque, in which the limit torque that can be transmitted from the hand tool to the drill is adjustable by means of an additional handle, characterized in that it has a pushbutton (22) for actuating the device (19) for adjusting the limit torque, which is in the grip area of the hand of the user operating the push button (24) for the on and off switch for the motor of the hand tool (1). 2. Motorisch angetriebenes Handwerkzeug für bohrenden cder schlagbohrenden Betrieb, mit einer das übertragene Drehmoment begrenzenden Sicherheitskupplung, bei dem das vom Handwerkzeug auf den Bohrer übertragbare Grenzdrehmoment mittels einer zusätzlichen Handhabe einstellbar ist, dadurch gekennzeichnet, daß es eine elektromagnetisch beeinflussbare Kupplung (17, 19) hat.2. Motor-driven hand tool for drilling or impact drilling operation, with a safety clutch limiting the transmitted torque, in which the limit torque that can be transmitted from the hand tool to the drill is adjustable by means of an additional handle, characterized in that it has an electromagnetically influenceable coupling (17, 19) Has. 3. Handwerkzeugmaschine nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß es einen Magneten (19) enthält, der mittels eines Schalters an Spannung legbar und so positioniert ist, daß dessen magnetische Kraft die Kraft einer Feder (18) verstärkt, durch die ein Kupplungsteil der Sicherheitskupplung (17) gegen das andere Kupplungsteil gepreßt wird und so das Übertragungsdrehmoment erhöht.3. Hand tool according to claim 1 and / or 2, characterized in that it contains a magnet (19) which can be placed by means of a switch on voltage and positioned so that its magnetic force increases the force of a spring (18) by the a coupling part of the safety clutch (17) is pressed against the other coupling part and thus increases the transmission torque. 4. Handwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß eine durch Federkraft ständig in ihre Ausschaltstellung gedrängte Drucktaste (22) zum Betätigen der Vorrichtung (19) zum Verstellen des Grenzdrehmoments mit einem Schalter so verbunden ist, daß dieser Schalter in gedrückter Stellung der Drucktaste (22) geschlossen, in Ruhestellung der Drucktaste (22) geöffnet ist.4. Hand tool according to claim 1, characterized in that a push button (22) for actuating the device (19) for adjusting the limit torque, which is constantly pressed into its switched-off position by spring force, is connected to a switch such that this switch is in the depressed position of the push button ( 22) is closed, in the rest position the push button (22) is open. 5. Handwerkzeug nach Anspruch 4, dadurch gekennzeichnet, daß die Drucktaste (22) mit einem Sperrglied (23) kombiniert ist, das die Drucktaste (22) gegen Eindrücken sperren kann.5. Hand tool according to claim 4, characterized in that the push button (22) is combined with a locking member (23) which can lock the push button (22) against being pressed in. 6. Handwerkzeug nach Anspruch 5, dadurch gekennzeichnet, daß das Sperrglied durch Federkraft ständig in seine Sperrstellung für die Drucktaste (22) gedrängt wird und mit einem Druckknopf6. Hand tool according to claim 5, characterized in that the locking member is constantly pressed by spring force into its locked position for the push button (22) and with a push button (23) verbunden ist, der bei gesperrter Drucktaste (22) aus dem Gehäuse (1) des Handwerkzeugs herausragt und eingedrückt die Drucktaste freigibt.(23) is connected, which protrudes from the housing (1) of the hand tool when the push button (22) is locked and releases the push button. 7. Handwerkzeug nach Anspruch 6, dadurch gekennzeichnet, daß das Sperrglied bzw. der Druckknopf (23) selbst nicht sperrbar ist.7. Hand tool according to claim 6, characterized in that the locking member or the push button (23) itself cannot be locked.
EP86114378A 1985-11-19 1986-10-17 Portable power-actuated tool for drilling with or without percussion Expired - Lifetime EP0224010B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540964 DE3540964A1 (en) 1985-11-19 1985-11-19 MOTOR DRIVEN TOOL FOR DRILLING OR IMPACT DRILLING
DE3540964 1985-11-19

Publications (2)

Publication Number Publication Date
EP0224010A1 true EP0224010A1 (en) 1987-06-03
EP0224010B1 EP0224010B1 (en) 1991-01-16

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Application Number Title Priority Date Filing Date
EP86114378A Expired - Lifetime EP0224010B1 (en) 1985-11-19 1986-10-17 Portable power-actuated tool for drilling with or without percussion

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US (1) US4776406A (en)
EP (1) EP0224010B1 (en)
DE (2) DE3540964A1 (en)

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DE2034363A1 (en) * 1970-07-10 1972-01-13 Coventry Gauge & Tool Co Ltd Overload slip clutch for adjustable maximum torques
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DE3103286A1 (en) * 1981-01-31 1982-08-12 Kress-elektrik GmbH & Co, Elektromotorenfabrik, 7457 Bisingen Electrical hand-held machine tool for screwing, drilling and possibly hammer-drilling
DE3235544A1 (en) * 1982-09-25 1984-03-29 Robert Bosch Gmbh, 7000 Stuttgart Drill hammer

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GB2261836A (en) * 1991-11-28 1993-06-02 Zanussi Elettrodomestici Pneumatic tool
GB2261836B (en) * 1991-11-28 1994-06-08 Zanussi Elettrodomestici Improved pneumatic tool
GB2415161A (en) * 2004-05-27 2005-12-21 Bosch Gmbh Robert Hand-held power tool with slip clutch
GB2415161B (en) * 2004-05-27 2006-12-13 Bosch Gmbh Robert Hand-held power tool, in particular rotary and/or impact hammer
US7303026B2 (en) 2004-05-27 2007-12-04 Robert Bosch Gmbh Hand power tool, in particular drill hammer and/or jackhammer
WO2009156005A1 (en) * 2008-06-24 2009-12-30 Robert Bosch Gmbh Method for operating a power tool having a clutch device
US8905153B2 (en) 2008-06-24 2014-12-09 Robert Bosch Gmbh Method for operating a power tool having a clutch device
WO2012159559A1 (en) * 2011-05-23 2012-11-29 Bosch Power Tools (China)Co., Ltd Power tool and transmission switching mechanism thereof
CN103878752A (en) * 2012-12-20 2014-06-25 罗伯特·博世有限公司 Tool With Switch Device

Also Published As

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DE3540964A1 (en) 1987-05-21
US4776406A (en) 1988-10-11
DE3676961D1 (en) 1991-02-21
EP0224010B1 (en) 1991-01-16

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