EP0224010B1 - 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
EP0224010B1
EP0224010B1 EP86114378A EP86114378A EP0224010B1 EP 0224010 B1 EP0224010 B1 EP 0224010B1 EP 86114378 A EP86114378 A EP 86114378A EP 86114378 A EP86114378 A EP 86114378A EP 0224010 B1 EP0224010 B1 EP 0224010B1
Authority
EP
European Patent Office
Prior art keywords
hand tool
grip
switch
trigger
clutch
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 - Lifetime
Application number
EP86114378A
Other languages
German (de)
French (fr)
Other versions
EP0224010A1 (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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
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 known from DE-A-3 039 617, which has a safety clutch acted upon by a spring, the transmitted limit torque of which, however, cannot be adjusted and cannot be influenced from the outside.
  • DE-B-2 157 984 shows a protective device on (stationary) machine tools in which the torque transmitted to the tool depends on a clutch, the limit torque of which is determined by an electromagnetic coil.
  • the clutch disengages completely when the coil is not energized.
  • the contact force of the coupling parts must be completely applied by the coil, which requires a large-volume coil and high currents.
  • a hand tool is known from DE-B-2 229 388, 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 that the limit torque can be increased during operation of the hand tool by pressing an easily accessible push button requiring little pressure. This means that the handheld power tool can be held with one hand without the drill being atypically loaded by transverse forces.
  • 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 4 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 concentric with the tool holder 2 on a cylinder 15 which is part of the scaffolding 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 magnitude 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 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.
  • the pushbutton 22 is assigned a locking member which can be removed from a 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 located 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 push button 23 and then the push button 22 thus released. The electromagnet 19 is energized via the switch operated with this push button 22. 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 in the desired manner elevated. As soon as the push button 22 is released, the power supply for the electromagnet 19 is also switched 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)

Description

Die Erfindung geht aus von einem motorisch getriebenen Handwerkzeug nach der Gattung des Hauptanspruchs. Aus der DE-A-3 039 617 ist ein solches Handwerkzeug bekannt, das eine von einer Feder beaufschlagte Sicherheitskupplung aufweist, deren übertragenes Grenzdrehmoment jedoch nicht einstellbar und nicht von außen beeinflußbar ist.The invention is based on a motor-driven hand tool according to the preamble of the main claim. Such a hand tool is known from DE-A-3 039 617, which has a safety clutch acted upon by a spring, the transmitted limit torque of which, however, cannot be adjusted and cannot be influenced from the outside.

Die DE-B-2 157 984 zeigt eine Schutzvorrichtung an (stationären) Werkzeugmaschinen, bei der das auf das Werkzeug übertragene Drehmoment von einer Kupplung abhängt, deren Grenzdrehmoment von einer elektromagnetischen Spule bestimmt wird. Bei dieser Vorrichtung kuppelt die Kupplung bei nicht stromdurchflossener Spule ganz aus. Die Anpreßkraft der Kupplungsteile muß vollständig von der Spule aufgebracht werden, was eine großvolumige Spule und hohe Ströme erfordert.DE-B-2 157 984 shows a protective device on (stationary) machine tools in which the torque transmitted to the tool depends on a clutch, the limit torque of which is determined by an electromagnetic coil. In this device, the clutch disengages completely when the coil is not energized. The contact force of the coupling parts must be completely applied by the coil, which requires a large-volume coil and high currents.

Aus der DE-B-2 229 388 ist ein Handwerkzeug bekannt, 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.A hand tool is known from DE-B-2 229 388, 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.

Das erfindungsgemäße Handwerkzeug mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß das Grenzdrehmoment während des Betriebs der Handwerkzeugmaschine durch Betätigen einer leicht zugänglichen und nur geringe Druckkräfte erfordenden Drucktaste erhöht werden kann. Damit ist auch ein einhändiges Halten der Handwerkzeugmaschine möglich, ohne daß der Bohrer untypisch durch Querkräfte belastet wird.The hand tool according to the invention with the characterizing features of the main claim has the advantage that the limit torque can be increased during operation of the hand tool by pressing an easily accessible push button requiring little pressure. This means that the handheld power tool can be held with one hand without the drill being atypically loaded by transverse forces.

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 un 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 automatically returning to its rest position when released and the locking element for this pushbutton. These measures can prevent an unwanted increase in the transmission torque or maintenance of the increased transmission torque.

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.

In einem Gehäuse 1 eines Bohrhammers, der eine Werkzeugaufnahme 2 und einen Handgriff besitzt, sind ein Schlagwerk 4 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 Schalgwerkes 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 Drehmoments 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 einer 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.A striking mechanism 4 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 concentric with the tool holder 2 on a cylinder 15 which is part of the scaffolding 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 magnitude 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 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 increase the force 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. The pushbutton 22 is assigned a locking member which can be removed from a 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 located 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 push button 23 and then the push button 22 thus released. The electromagnet 19 is energized via the switch operated with this push button 22. 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 in the desired manner elevated. As soon as the push button 22 is released, the power supply for the electromagnet 19 is also switched off. The old transmission torque, determined by the helical spring 18, is established on the clutch 17.

Claims (5)

1. Motor-driven hand tool (1) for drilling or percussion operation, comprising an on/off switch, having a trigger (24), for the motor, and a safety clutch (17) limiting the torque transmitted by the hand tool (1) to the drill bit (16), one clutch part (14) of which safety clutch (17) is thrust by a spring (18) against the other clutch part, characterized in that the transmitted limit torque is adjustable by the force of the spring (18) being increased by the force of an electromagnet (19) which can be energized by means of an additional grip (22) lying in the gripping range of the hand of the user also operating the trigger (24).
2. Hand tool according to Claim 1, characterized in that a trigger (22), thrust constantly into its switch-off position by spring force, for actuating the device (19) for adjusting the limit torque is connected to a switch in such a way that this switch is closed in the depressed position of the grip (22) and open in the inoperative position of the grip (22).
3. Hand tool according to Claim 2, characterized in that the grip (22) is combined with a blocking element (23) which can block the grip (22) to prevent it being pressed in.
4. Hand tool according to Claim 3, characterized in that the blocking element is constantly thrust by spring force into its blocking position for the trigger (22) and is connected to a push-button (23) which, when grip (22) is blocked, projects from the housing (1) of the hand tool and, pressed in, releases the grip.
5. Hand tool according to Claim 4, characterized in that the blocking element or the push-button (23) itself cannot be blocked.
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
DE3540964 1985-11-19
DE19853540964 DE3540964A1 (en) 1985-11-19 1985-11-19 MOTOR DRIVEN TOOL FOR DRILLING OR IMPACT DRILLING

Publications (2)

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

Family

ID=6286359

Family Applications (1)

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

Country Status (3)

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

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CN105415294A (en) * 2015-12-28 2016-03-23 河南广度超硬材料有限公司 Percussion drill with magnetic excitation device

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Publication number Priority date Publication date Assignee Title
CN105415294A (en) * 2015-12-28 2016-03-23 河南广度超硬材料有限公司 Percussion drill with magnetic excitation device

Also Published As

Publication number Publication date
DE3540964A1 (en) 1987-05-21
US4776406A (en) 1988-10-11
DE3676961D1 (en) 1991-02-21
EP0224010A1 (en) 1987-06-03

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