EP1170095A2 - Electric handtool with switching-off during idling - Google Patents

Electric handtool with switching-off during idling Download PDF

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Publication number
EP1170095A2
EP1170095A2 EP01810614A EP01810614A EP1170095A2 EP 1170095 A2 EP1170095 A2 EP 1170095A2 EP 01810614 A EP01810614 A EP 01810614A EP 01810614 A EP01810614 A EP 01810614A EP 1170095 A2 EP1170095 A2 EP 1170095A2
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EP
European Patent Office
Prior art keywords
electric hand
sensor
hand tool
tool device
empty
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
EP01810614A
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German (de)
French (fr)
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EP1170095A3 (en
EP1170095B1 (en
Inventor
Hans-Werner Bongers-Ambrosius
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Hilti AG
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Hilti AG
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Publication date
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Publication of EP1170095A2 publication Critical patent/EP1170095A2/en
Publication of EP1170095A3 publication Critical patent/EP1170095A3/en
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Publication of EP1170095B1 publication Critical patent/EP1170095B1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • B25D2250/131—Idling mode of tools
    • 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
    • B25D2250/221—Sensors

Definitions

  • the invention relates to an at least partially striking electric hand tool device, For example, a hammer drill or a chisel hammer, with a blank stop switch pneumatic hammer mechanism.
  • the drive of the striking mechanism is used to switch off the empty stroke automatically interrupted via a clutch when the tool is in an axial empty position which is measured with a sensor and with a control unit is evaluated.
  • a disadvantage of such a solution is the coupling required for this.
  • the axial position of the tool, the striking tool or the Percussion mechanism scanned with a sensor and this information with a control unit evaluated, which in the event of an empty stroke, the speed of the excitation drive to a Reduced speed previously determined.
  • the invention therefore acts according to the polluter pays principle at the constant speed of the exciter drive, which is the cause of empty strokes.
  • a sufficiently reduced speed of the exciter drive conditionally forms Ventilation openings no longer expel pressure differential accelerating the flying piston, which means that no further blows to the die and tool are generated.
  • To the speed of the excitation drive is reduced to 10% to 50% of the working speed.
  • the sensor is advantageously designed as an inductive or capacitive sensor, which is direct responsive to the axial position of the tool, the striking tool or the striking mechanism.
  • the senor is designed as a Hall sensor, which is relative to it Movable magnet is assigned, which with an the axial position of the tool, the striker or the striking actuator is connected.
  • This actuator is advantageously fork-shaped axially engaging in the die, and attached to the outer circumference of the anvil, for example with a light aluminum ring.
  • the advantageously consists of a lightweight, highly rigid fiber-reinforced plastic actuator a small magnet, which together with the striker passes the Hall sensor emotional.
  • the exciter drive is advantageously designed as an electric motor, the motor speed of which Control unit on the engine electronics is electronically degradable.
  • Fig. 1 as an electric hand tool device with blank shutdown.
  • an electric hand tool device 1 has a pneumatic hammer mechanism 2 an exciter drive 3, an exciter piston 4, a gas spring 5, a flying piston 6 and a striker 7, which in the part of FIG. 1 shown below a striking axis A. to a housing 8 an empty position 9 and in above the stroke axis A. shown part of FIG. 1 is a working position 10 of a not fully shown Tool 11, the anvil 7 and the flying piston 6.
  • the striker 7 is a axially movable actuator 12 is positively connected, which has a magnet 13 which is assigned to a Hall sensor 14 fastened in the housing 8.
  • the Hall sensor 14 is electrical with a control unit 15 and this with motor electronics 16 an electric motor 17 connected.

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

Abstract

Ein Elektrohandwerkzeuggerät (1) zur Erzeugung einer zumindest teilweise schlagenden Bewegung eines Werkzeugs (11) mit einem pneumatischen Schlagwerk (2) und einer Leerschlagabschaltung, welche die Leerschlagposition (9) von einem Sensor (14) abtastet und mit einer zugeordneten Kontrolleinheit (15) auswertet, senkt im Falle eines Leerschlags über die Kontrolleinheit (15) die Drehzahl eines Erregerantriebs (3) auf eine vorher festgelegte Drehzahl ab.

Figure 00000001
An electric hand tool device (1) for generating an at least partially striking movement of a tool (11) with a pneumatic striking mechanism (2) and an empty stroke switch-off, which scans the empty stroke position (9) by a sensor (14) and evaluates it with an assigned control unit (15) , lowers the speed of an exciter drive (3) to a predetermined speed in the event of an empty stroke via the control unit (15).
Figure 00000001

Description

Die Erfindung bezeichnet ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät, bspw. einen Bohrhammer oder einen Meisselhammer, mit Leerschlagabschaltung eines pneumatischen Schlagwerks.The invention relates to an at least partially striking electric hand tool device, For example, a hammer drill or a chisel hammer, with a blank stop switch pneumatic hammer mechanism.

Elektrohandwerkzeuggeräte mit pneumatischem Schlagwerk benutzen zur Erzeugung des Schlages eine hin- und hergehende schwingende Bewegung, welche auf eine Gasfeder zwischen einem in einem Hohlzylinder dichtend relativ zu diesem beweglichen Erregerkolben und einem distanzierten, in Richtung der Werkzeugachse dichtend beweglichen, Flugkolben aufgebracht wird, welcher über einen Döpper axial auf das Werkzeug schlägt. Der Schlag wird vorteilhaft bei fehlendem Gegendruck auf das in einer Werkzeugaufnahme axial begrenzt bewegliche Werkzeug über eine Leerschlagabschaltung unterbrochen.Use electric hand tools with pneumatic striking mechanism to generate the Strikes a back and forth swinging movement, which on a gas spring between a sealing piston in a hollow cylinder relative to this movable exciter piston and a distant, flying piston which is sealingly movable in the direction of the tool axis is applied, which strikes the tool axially via a striker. The punch is advantageous in the absence of back pressure on the axially in a tool holder limited moving tool interrupted by a blank stop.

Nach der EP759341A3 wird bei Einnahme einer, durch eine Leerwegvergrösserung ermöglichten, Leerschlagposition des Döppers, zur Leerschlagabschaltung die Gasfeder über gesteuerte Ventile zur Umgebung belüftet und somit eine den Schlag erzeugende Druckdifferenz verhindert. Nachteilig bei einer derartigen Lösung sind die dazu erforderlichen Ventile und die Ventilsteuerung.According to EP759341A3, when taking one made possible by increasing the free travel, Empty position of the striker, the gas spring to switch off the empty position controlled valves ventilated to the environment and thus a pressure difference generating the blow prevented. The valves required for such a solution are disadvantageous and the valve control.

Nach der WO88/06508 wird zur Leerschlagabschaltung der Antrieb des Schlagwerkes automatisch über eine Kupplung unterbrochen, wenn das Werkzeug eine axiale Leerschlagposition einnimmt, welche mit einem Sensor gemessen und mit einer Kontrolleinheit ausgewertet wird. Nachteilig bei einer derartigen Lösung ist die dazu erforderliche Kupplung.According to WO88 / 06508, the drive of the striking mechanism is used to switch off the empty stroke automatically interrupted via a clutch when the tool is in an axial empty position which is measured with a sensor and with a control unit is evaluated. A disadvantage of such a solution is the coupling required for this.

Es ist die Aufgabe dieser Erfindung, eine einfache Lösung zur Leerschlagabschaltung eines zumindest teilweise schlagenden Elektrohandwerkzeuggerätes aufzuzeigen.It is the object of this invention to provide a simple solution for switching off a blank to show at least partially striking electric hand tool device.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im wesentlichen wird die axiale Position von dem Werkzeug, dem Döpper bzw. dem Schlagwerk mit einem Sensor abgetastet und diese Information mit einer Kontrolleinheit ausgewertet, welche im Falle eines Leerschlags die Drehzahl des Erregerantriebs auf eine vorher festgelegte Drehzahl absenkt. Somit greift die Erfindung nach dem Verursacherprinzip bei der für Leerschläge ursächlichen, konstant bleibenden Drehzahl des Erregerantriebs an. Bei einer hinreichend abgesenkten Drehzahl des Erregerantriebs bildet sich bedingt durch Belüftungsöffnungen keine den Flugkolben beschleunigende Druckdifferenz mehr aus, wodurch keine weiteren Schläge auf den Döpper und das Werkzeug erzeugt werden. Dazu wird die Drehzahl des Erregerantriebs auf 10% bis 50% der Arbeitsdrehzahl reduziert.Essentially, the axial position of the tool, the striking tool or the Percussion mechanism scanned with a sensor and this information with a control unit evaluated, which in the event of an empty stroke, the speed of the excitation drive to a Reduced speed previously determined. The invention therefore acts according to the polluter pays principle at the constant speed of the exciter drive, which is the cause of empty strokes. With a sufficiently reduced speed of the exciter drive, conditionally forms Ventilation openings no longer expel pressure differential accelerating the flying piston, which means that no further blows to the die and tool are generated. To the speed of the excitation drive is reduced to 10% to 50% of the working speed.

Vorteilhaft ist der Sensor als induktiver oder kapazitiver Sensor ausgeführt, welcher direkt auf die axiale Position von dem Werkzeug, dem Döpper bzw. dem Schlagwerk anspricht.The sensor is advantageously designed as an inductive or capacitive sensor, which is direct responsive to the axial position of the tool, the striking tool or the striking mechanism.

Alternativ ist der Sensor als Hall-Sensor ausgeführt, welcher einem relativ zu diesem bewegbaren Magneten zugeordnet ist, der mit einem die axiale Position von dem Werkzeug, dem Döpper bzw. dem Schlagwerk abgreifenden Stellglied verbunden ist.Alternatively, the sensor is designed as a Hall sensor, which is relative to it Movable magnet is assigned, which with an the axial position of the tool, the striker or the striking actuator is connected.

Dieses Stellglied ist vorteilhaft gabelförmig axial in den Döpper eingreifend ausgeführt, und am äusseren Umfang des Döppers, bspw. mit einem leichten Aluminiumring, befestigt. Das vorteilhaft aus leichtem, hochsteifem faserverstärkten Kunststoff bestehende Stellglied weist einen kleinen Magneten auf, der sich zusammen mit dem Döpper an dem Hall-Sensor vorbei bewegt.This actuator is advantageously fork-shaped axially engaging in the die, and attached to the outer circumference of the anvil, for example with a light aluminum ring. The advantageously consists of a lightweight, highly rigid fiber-reinforced plastic actuator a small magnet, which together with the striker passes the Hall sensor emotional.

Vorteilhaft ist der Erregerantrieb als Elektromotor ausgeführt, dessen Motordrehzahl von der Kontrolleinheit über die Motorelektronik elektronisch herabsetzbar ist.The exciter drive is advantageously designed as an electric motor, the motor speed of which Control unit on the engine electronics is electronically degradable.

Vorteilhaft wird der Erregerantrieb und ein optionaler Drehantrieb über ein Getriebe von einem gemeinsamen Elektromotor abgeleitet, wodurch bei einem Leerschlag ebenfalls die Drehzahl einer optionalen Drehbewegung herabgesetzt wird.The exciter drive and an optional rotary drive via a gearbox from derived from a common electric motor, which also in the event of a blank stroke Speed of an optional rotary movement is reduced.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit: Fig. 1 als Elektrohandwerkzeuggerät mit Leerschlagabschaltung.The invention is explained in more detail with respect to an advantageous exemplary embodiment with: Fig. 1 as an electric hand tool device with blank shutdown.

Nach Fig. 1 weist ein Elektrohandwerkzeuggerät 1 ein pneumatisches Schlagwerk 2 mit einem Erregerantrieb 3, einem Erregerkolben 4, einer Gasfeder 5, einem Flugkolben 6 und einen Döpper 7 auf, welches im unterhalb einer Schlagachse A dargestellten Teil der Fig. 1 zu einem Gehäuses 8 eine Leerschlagposition 9 und im oberhalb der Schlagachse A dargestellten Teil der Fig. 1 eine Arbeitsposition 10 eines nicht vollständig dargestellten Werkzeugs 11, des Döppers 7 sowie des Flugkolbens 6 aufweist. Mit dem Döpper 7 ist ein axial bewegliches Stellglied 12 formschlüssig verbunden, welches einen Magneten 13 aufweist, der einem im Gehäuse 8 befestigten Hall-Sensor 14 zugeordnet ist. Der Hall-Sensor 14 ist elektrisch mit einer Kontrolleinheit 15 und diese mit einer Motorelektronik 16 eines Elektromotors 17 verbunden.According to FIG. 1, an electric hand tool device 1 has a pneumatic hammer mechanism 2 an exciter drive 3, an exciter piston 4, a gas spring 5, a flying piston 6 and a striker 7, which in the part of FIG. 1 shown below a striking axis A. to a housing 8 an empty position 9 and in above the stroke axis A. shown part of FIG. 1 is a working position 10 of a not fully shown Tool 11, the anvil 7 and the flying piston 6. With the striker 7 is a axially movable actuator 12 is positively connected, which has a magnet 13 which is assigned to a Hall sensor 14 fastened in the housing 8. The Hall sensor 14 is electrical with a control unit 15 and this with motor electronics 16 an electric motor 17 connected.

Claims (7)

Elektrohandwerkzeuggerät zur Erzeugung einer zumindest teilweise schlagenden Bewegung eines Werkzeugs (11) mit einem pneumatischen Schlagwerk (2) und einer Leerschlagabschaltung des Schlages bei fehlendem axialen Gegendruck über das Werkzeug (11), wobei sich im Falle des Leerschlags ein Flugkolben (6), ein optionaler Döpper (7) und das optional aufgenommene Werkzeug (11) in einer Leerschlagposition (9) befindet, welche von einem Sensor (14) abgetastet und mit einer zugeordneten Kontrolleinheit (15) ausgewertet wird, dadurch gekennzeichnet, dass im Falle eines Leerschlags von der Kontrolleinheit (15) die Drehzahl eines Erregerantriebs (3) auf eine vorher festgelegte Drehzahl absenkbar ist.Electric hand tool device for generating an at least partially striking movement of a tool (11) with a pneumatic striking mechanism (2) and an empty stroke switch-off of the stroke in the absence of axial counterpressure via the tool (11), a flying piston (6), an optional one, in the event of the empty stroke Döpper (7) and the optionally picked-up tool (11) are in an empty position (9), which is sensed by a sensor (14) and evaluated with an assigned control unit (15), characterized in that in the event of an empty stroke by the control unit (15) the speed of an excitation drive (3) can be reduced to a predetermined speed. Elektrohandwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass der Sensor (14) die Leerschlagposition (9) des Werkzeugs (11) oder alternativ des Döppers (7) oder alternativ des Flugkolbens (6) abtastet.Electric hand tool device according to claim 1, characterized in that the sensor (14) scans the empty position (9) of the tool (11) or alternatively the striker (7) or alternatively the flying piston (6). Elektrohandwerkzeuggerät nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass der Sensor (14) als induktiver oder kapazitiver Sensor ausgeführt ist.Electric hand tool device according to claim 1 or claim 2, characterized in that the sensor (14) is designed as an inductive or capacitive sensor. Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Sensor (14) als Hall-Sensor mit einem relativ zu diesem bewegbaren Magneten (13) ausgeführt ist.Electric hand tool device according to one of the preceding claims, characterized in that the sensor (14) is designed as a Hall sensor with a magnet (13) movable relative to the latter. Elektrohandwerkzeuggerät nach Anspruch 4, dadurch gekennzeichnet, dass der Magnet (13) mit einem Stellglied (12) verbunden ist, welcher die Leerschlagposition (9) des Werkzeugs (11) oder alternativ des Döppers (7) oder alternativ des Flugkolbens (5) abtastet.Electric hand tool device according to claim 4, characterized in that the magnet (13) is connected to an actuator (12) which scans the empty position (9) of the tool (11) or alternatively of the striker (7) or alternatively of the flying piston (5). Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Erregerantrieb (3) über eine Motorelektronik (16) eines Elektromotors (17) steuerbar ist.Electric hand tool device according to one of the preceding claims, characterized in that the exciter drive (3) can be controlled via motor electronics (16) of an electric motor (17). Elektrohandwerkzeuggerät nach Anspruch 6, dadurch gekennzeichnet, dass der Erregerantrieb (3) und ein optionaler Drehantrieb Teil eines von einem gemeinsamen Elektromotor (17) angetriebenen Getriebes ist.Electric hand tool device according to claim 6, characterized in that the exciter drive (3) and an optional rotary drive is part of a transmission driven by a common electric motor (17).
EP01810614A 2000-07-08 2001-06-25 Electric handtool with switching-off during idling Expired - Lifetime EP1170095B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10033362A DE10033362A1 (en) 2000-07-08 2000-07-08 Electric hand tool with empty stroke shutdown
DE10033362 2000-07-08

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EP1170095A2 true EP1170095A2 (en) 2002-01-09
EP1170095A3 EP1170095A3 (en) 2003-10-29
EP1170095B1 EP1170095B1 (en) 2005-02-09

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US (1) US6484814B2 (en)
EP (1) EP1170095B1 (en)
JP (1) JP5086505B2 (en)
CN (1) CN1217770C (en)
AU (1) AU5193901A (en)
DE (2) DE10033362A1 (en)
ZA (1) ZA200105554B (en)

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CN1217770C (en) 2005-09-07
CN1332062A (en) 2002-01-23
AU5193901A (en) 2002-01-10
EP1170095A3 (en) 2003-10-29
ZA200105554B (en) 2002-01-17
US6484814B2 (en) 2002-11-26
DE50105284D1 (en) 2005-03-17
JP5086505B2 (en) 2012-11-28
EP1170095B1 (en) 2005-02-09
JP2002059376A (en) 2002-02-26
US20020003045A1 (en) 2002-01-10

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