EP1170095B1 - Electric handtool with switching-off during idling - Google Patents

Electric handtool with switching-off during idling Download PDF

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Publication number
EP1170095B1
EP1170095B1 EP01810614A EP01810614A EP1170095B1 EP 1170095 B1 EP1170095 B1 EP 1170095B1 EP 01810614 A EP01810614 A EP 01810614A EP 01810614 A EP01810614 A EP 01810614A EP 1170095 B1 EP1170095 B1 EP 1170095B1
Authority
EP
European Patent Office
Prior art keywords
tool
electric hand
sensor
hand tool
idling
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
EP01810614A
Other languages
German (de)
French (fr)
Other versions
EP1170095A2 (en
EP1170095A3 (en
Inventor
Hans-Werner Bongers-Ambrosius
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
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1170095A2 publication Critical patent/EP1170095A2/en
Publication of EP1170095A3 publication Critical patent/EP1170095A3/en
Application granted granted Critical
Publication of EP1170095B1 publication Critical patent/EP1170095B1/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
    • 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 refers to an at least partially striking electric hand tool device according to the preamble of claim 1, which is known from the document WO 8 806 508 A is known, For example, a hammer drill or a chisel hammer, with Leerschlagabscen a pneumatic impact mechanism.
  • Electric hand tools with pneumatic percussion use to generate the Beat a reciprocating swinging motion, pointing to a gas spring between one in a hollow cylinder sealing relative to this movable exciter piston and a distanced, in the direction of the tool axis sealingly movable, air piston is applied, which beats axially via an anvil on the tool.
  • the punch is advantageous in the absence of back pressure on the in a tool holder axially limited movable tool interrupted by a space switch.
  • the drive of the percussion mechanism is used for blank stop automatically interrupted by a clutch when the tool has an axial blanking position which is measured with a sensor and with a control unit is evaluated.
  • the disadvantage of such a solution is the required coupling.
  • the invention uses the polluter pays principle at the causal for vacancies, constant speed of the exciter drive on. At a sufficiently lowered speed of the exciter drive forms due Vents no more pressure on the fly piston accelerating pressure, whereby no further blows to the striker and the tool are generated. To The speed of the exciter drive is reduced to 10% to 50% of the working speed.
  • the senor is designed as an inductive or capacitive sensor, which directly responds to the axial position of the tool, the striker or percussion.
  • the senor is designed as a Hall sensor, which is a relative to this associated with a movable magnet having an axial position of the tool, connected to the striker or the percussion actuator.
  • This actuator is advantageously executed forked engaging axially in the striker, and on the outer circumference of the bonnet, for example, with a light aluminum ring attached.
  • the advantageous from lightweight, highly rigid fiber-reinforced plastic existing actuator has a small magnet, which passes along with the striker at the Hall sensor emotional.
  • the exciter drive is designed as an electric motor whose engine speed of the Control unit via the engine electronics electronically herabsetzbar is.
  • the exciter drive and an optional rotary drive via a transmission of derived from a common electric motor, whereby at a space also the Speed of an optional rotational movement is reduced.
  • the striker 7 is a axially movable actuator 12 positively connected, which is a magnet 13th has, which is associated with a mounted in the housing 8 Hall sensor 14.
  • the Hall sensor 14 is electrically connected to a control unit 15 and this with an engine electronics 16 an electric motor 17 connected.

Description

Die Erfindung bezeichnet ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät gemäß dem Oberbegriff des Anspruchs 1, das aus dem Dokument WO 8 806 508 A bekannt ist, bspw. einen Bohrhammer oder einen Meisselhammer, mit Leerschlagabschaltung eines pneumatischen Schlagwerks.The invention refers to an at least partially striking electric hand tool device according to the preamble of claim 1, which is known from the document WO 8 806 508 A is known, For example, a hammer drill or a chisel hammer, with Leerschlagabschaltung a pneumatic impact 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.Electric hand tools with pneumatic percussion use to generate the Beat a reciprocating swinging motion, pointing to a gas spring between one in a hollow cylinder sealing relative to this movable exciter piston and a distanced, in the direction of the tool axis sealingly movable, air piston is applied, which beats axially via an anvil on the tool. The punch is advantageous in the absence of back pressure on the in a tool holder axially limited movable tool interrupted by a space switch.

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, taking in, by a Leerwegvergrösserung enabled, Discharge position of the striker, for idle stop the gas spring over controlled valves vented to the environment and thus a pressure difference generating the impact prevented. The disadvantage of such a solution are the valves required for this purpose 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 percussion mechanism is used for blank stop automatically interrupted by a clutch when the tool has an axial blanking position which is measured with a sensor and with a control unit is evaluated. The disadvantage of such a solution is the required coupling.

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 blanking of a show at least partially beating electric hand tool device.

Die Aufgabe wird durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is solved by the features of the independent claim. Advantageous developments emerge 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.In essence, the axial position of the tool, the striker or the Schlagwerk scanned with a sensor and this information with a control unit evaluated, which in the case of a blank, the speed of the exciter drive to a previously set speed lowers. Thus, the invention uses the polluter pays principle at the causal for vacancies, constant speed of the exciter drive on. At a sufficiently lowered speed of the exciter drive forms due Vents no more pressure on the fly piston accelerating pressure, whereby no further blows to the striker and the tool are generated. To The speed of the exciter 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.Advantageously, the sensor is designed as an inductive or capacitive sensor, which directly responds to the axial position of the tool, the striker or percussion.

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 a relative to this associated with a movable magnet having an axial position of the tool, connected to the striker or the percussion actuator.

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 executed forked engaging axially in the striker, and on the outer circumference of the bonnet, for example, with a light aluminum ring attached. The advantageous from lightweight, highly rigid fiber-reinforced plastic existing actuator has a small magnet, which passes along with the striker at the Hall sensor emotional.

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

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.Advantageously, the exciter drive and an optional rotary drive via a transmission of derived from a common electric motor, whereby at a space also the Speed of an optional rotational movement is reduced.

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

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 1 with a pneumatic percussion 2 with an exciter drive 3, an excitation piston 4, a gas spring 5, a flying piston 6 and an anvil 7, which in the below a striking axis A shown part of Fig. 1st to a housing 8 a Leerschlagposition 9 and in the above the striking axis A. 1 shows a working position 10 of a not fully shown Tool 11, the striker 7 and the flying piston 6 has. With the striker 7 is a axially movable actuator 12 positively connected, which is a magnet 13th has, which is associated with a mounted in the housing 8 Hall sensor 14. The Hall sensor 14 is electrically connected to a control unit 15 and this with an engine electronics 16 an electric motor 17 connected.

Claims (7)

  1. Electric hand tool for generating an at least partially percussive movement of a tool (11) with a pneumatic percussion mechanism (2) and an idling switch-off for percussion in the case of lack of axial counter-pressure over the tool (11), and in the case of idling, a fly piston (6), an optical cupping tool (7) and the optionally accommodated tool (11) are in an idling percussion position (9) which is monitored by a sensor (14) and evaluated by an associated control unit (15), characterised in that in the event of idle percussion a control unit (15) will reduce the rotation of an exciter drive (3) to a preset rotation.
  2. Electric hand tool according to Claim 1, characterised in that the sensor (14) monitors the idling position (9) of the tool (11) or alternatively of the cupping tool (7) or alternatively of the fly piston (6).
  3. Electric hand tool according to Claim 1 or Claim 2, characterised in that the sensor (14) is designed as an inductive or capacitive sensor.
  4. Electric hand tool according to one of the above claims, characterised in that the sensor (14) is designed as a Hall sensor with a magnet (13) which is movable relative to the latter.
  5. Electric hand tool according to Claim 4, characterised in that the magnet (13) is connected to a control member (12) which monitors the idling position (9) of the tool (11) or alternatively of the cupping tool (7) or alternatively of the fly piston (5).
  6. Electric hand tool according to one of the above claims, characterised in that the exciter driver (3) is controllable via a motor electronics (16) of an electric motor (17).
  7. Electric hand tool according to Claim 6, characterised in that the exciter drive (3) and an optional rotary drive are part of a gearing which is 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
DE10033362 2000-07-08
DE10033362A DE10033362A1 (en) 2000-07-08 2000-07-08 Electric hand tool with empty stroke shutdown

Publications (3)

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

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EP01810614A Expired - Lifetime EP1170095B1 (en) 2000-07-08 2001-06-25 Electric handtool with switching-off during idling

Country Status (7)

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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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Publication number Publication date
CN1217770C (en) 2005-09-07
DE50105284D1 (en) 2005-03-17
CN1332062A (en) 2002-01-23
JP5086505B2 (en) 2012-11-28
JP2002059376A (en) 2002-02-26
US6484814B2 (en) 2002-11-26
US20020003045A1 (en) 2002-01-10
DE10033362A1 (en) 2002-01-17
AU5193901A (en) 2002-01-10
EP1170095A2 (en) 2002-01-09
ZA200105554B (en) 2002-01-17
EP1170095A3 (en) 2003-10-29

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