EP1151828B1 - Rotatable electric hand tool with security system - Google Patents

Rotatable electric hand tool with security system Download PDF

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Publication number
EP1151828B1
EP1151828B1 EP01810392A EP01810392A EP1151828B1 EP 1151828 B1 EP1151828 B1 EP 1151828B1 EP 01810392 A EP01810392 A EP 01810392A EP 01810392 A EP01810392 A EP 01810392A EP 1151828 B1 EP1151828 B1 EP 1151828B1
Authority
EP
European Patent Office
Prior art keywords
speed
hand tool
housing
electric hand
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.)
Expired - Lifetime
Application number
EP01810392A
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German (de)
French (fr)
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EP1151828A1 (en
Inventor
Ferdinand Kristen
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
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Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1151828A1 publication Critical patent/EP1151828A1/en
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Publication of EP1151828B1 publication Critical patent/EP1151828B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION 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
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Definitions

  • the invention relates to a safety routine and an associated rotating electric hand tool device, in particular a drill, a hammer drill or a combination hammer.
  • the sudden high angular momentum generated by the blockage is separated from the jammed tool by slip or safety clutches or limited in torque.
  • the separation is often delayed, so that an inadmissible rotation of the housing can no longer be prevented by the already transmitted to the housing of the electric hand tool rotational energy.
  • DE19631517A1 is the use of a motor control electronics speed controllable collector and slip-ring electric motors, in particular switched reluctance motors, in electrical hand tool devices and the air cooling of the control electronics arranged in the housing previously known.
  • the invention has the object of demonstrating a simple separation of the power transmission in electrical hand tool devices. Another aspect is a further solution for the reliable prevention of an inadmissibly high rotation of the housing of the electric hand tool device.
  • a speed-controllable via a motor control electronics collector and slip-ring electric motor for example, a switched reluctance motor, especially in the case of a, from a sensor connected to the housing and a microcontroller registered future expected inadmissible rotation, braked down via the engine control electronics with respect to the speed whereby, when falling below a clutch speed arranged in the power transmission path between the electric motor and a transmission, purely mechanical, centrifugally controlled clutch for transmitting the torque separates the power transmission.
  • the speed-controllable via a motor control electronics collector and slip-ring electric motors can be actively braked quickly, whereby an unacceptably long hunting can be safely prevented.
  • Another advantage of this solution is also the elimination of the electromechanical coupling otherwise required for the safety routine, thereby reducing weight and manufacturing costs.
  • Fig. 1 as electric hand tool.
  • the housing 2 is connected to a, evaluated by a microcontroller, sensor 7 for detecting a future, inadmissibly high, rotation of the housing 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Portable Power Tools In General (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Control Of Electric Motors In General (AREA)

Description

Die Erfindung betrifft eine Sicherheitsroutine und ein zugeordnetes drehendes Elektrohandwerkzeuggerät, insbesondere eine Bohrmaschine, einen Bohrhammer oder einen Kombihammer.The invention relates to a safety routine and an associated rotating electric hand tool device, in particular a drill, a hammer drill or a combination hammer.

Bei grossen und leistungsstarken drehenden Elektrohandwerkzeuggeräten besteht die Gefahr der Verletzung des Nutzers durch unzulässige Verdrehungen des Gehäuses beim Mitdrehen durch plötzliche Werkzeugblockierungen als Folge der in Elektrohandwerkzeuggeräten gespeicherten kinetischen Energie. Bei Startblockierern, also bei einer bereits im Einschaltzeitpunkt vorliegenden Werkzeugblockade, besteht durch das plötzliche Mitdrehen des Gehäuses eine besonders hohe Verletzungsgefahr.With large and powerful rotating electric hand tool devices, there is a risk of injury to the user due to inadmissible twisting of the housing when turning by sudden blockage of the tool as a result of kinetic energy stored in power hand tools. In the case of start blockers, that is to say in the case of a tool blockage already present at the time of switch-on, the sudden turning of the housing causes a particularly high risk of injury.

Üblicherweise wird der diese Verdrehung durch die Blockierung erzeugende plötzliche hohe Drehimpuls durch Rutsch- oder Sicherheitskupplungen vom blockierten Werkzeug getrennt oder bezüglich des Drehmomentes begrenzt. Die Trennung erfolgt jedoch oftmals verspätet, so dass durch die bereits auf das Gehäuse des Elektrohandwerkzeuggerätes übertragene Rotationsenergie eine unzulässige Verdrehung des Gehäuses nicht mehr verhindert werden kann.Usually, the sudden high angular momentum generated by the blockage is separated from the jammed tool by slip or safety clutches or limited in torque. However, the separation is often delayed, so that an inadmissible rotation of the housing can no longer be prevented by the already transmitted to the housing of the electric hand tool rotational energy.

Aus der DE3128410A1 ist die Messung des auf das Gehäuse wirkenden Drehmoments über den das Elektrohandwerkzeuggerät führenden Handgriff bekannt. Über die analoge Integration eines dem Drehmoment proportionalen Signals wird bei Überschreitung eines Grenzwertes eine Sicherheitseinrichtung zur Vermeidung eines Werkzeugblockierens, Klemmens und Würgens aktiviert. Nachteilig ist die zum Aufbau der Gegenkraft am Handgriff notwendige Führung des Elektrohandwerkzeuggerätes durch den Nutzer.From the DE3128410A1 is the measurement of the torque acting on the housing over the electric hand tool device leading handle known. The analog integration of a signal proportional to the torque activates a safety device to prevent tool blocking, jamming and choking if a limit value is exceeded. A disadvantage is the necessary to build up the counterforce on the handle leadership of the electric hand tool by the user.

Aus der EP666148B1 ist ein Verfahren und eine Vorrichtung zur Vermeidung unzulässig grosser Verdrehwinkel von Elektrohandwerkzeuggeräten bekannt, welche mit einem Mikrocontroller den in einem zukünftigen Zeitpunkt zu erwartenden Verdrehwinkel des Gehäuses aus der aktuellen Winkelbeschleunigung des Gehäuses im voraus berechnet und bei Überschreiten eines Grenzwertes eine Sicherheitseinrichtung zur Vermeidung dieser Überschreitung aktiviert. Bei Startblockaden kann es vereinzelt dennoch, insbesondere bei Nutzung an schwachen Stromnetzen mit einem hohen Innenwiderstand durch die sich dann erst langsam aufbauende Rotorbeschleunigung des Elektromotors, zu einer derart geringen Winkelbeschleunigung des Gehäuses kommen, dass der im voraus berechnete Verdrehwinkel des Gehäuses den Grenzwert nicht überschreitet und folglich die Sicherheitseinrichtung nicht aktiviert wird.From the EP666148B1 is a method and apparatus for preventing unacceptably large angle of rotation of electric hand tool devices known which calculates with a microcontroller expected in a future time angle of rotation of the housing from the current angular acceleration of the housing in advance and activated when exceeding a limit, a safety device to prevent this excess , In start blocks, it can still be isolated, especially at Use on weak power networks with a high internal resistance by the then slowly building rotor acceleration of the electric motor, come to such a low angular acceleration of the housing that the calculated in advance angle of rotation of the housing does not exceed the limit and thus the safety device is not activated.

Nach der DE19631517A1 ist die Verwendung von über eine Motorsteuerelektronik drehzahlsteuerbaren kollektor- und schleifringlosen Elektromotoren, insbesondere geschalteter Reluktanzmotoren, in Elektrohandwerkzeuggeräten sowie die Luftkühlung der im Gehäuse angeordneten Steuerelektronik vorbekannt.After DE19631517A1 is the use of a motor control electronics speed controllable collector and slip-ring electric motors, in particular switched reluctance motors, in electrical hand tool devices and the air cooling of the control electronics arranged in the housing previously known.

Der Erfindung liegt die Aufgabe zugrunde, eine einfache Trennung der Kraftübertragung bei Elektrohandwerkzeuggeräten aufzuzeigen. Ein weiterer Aspekt besteht in einer weiteren Lösung zur sicheren Verhinderung einer unzulässig hohen Verdrehung des Gehäuses des Elektrohandwerkzeuggerätes.The invention has the object of demonstrating a simple separation of the power transmission in electrical hand tool devices. Another aspect is a further solution for the reliable prevention of an inadmissibly high rotation of the housing of the electric hand tool device.

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

Im wesentlichen wird ein über eine Motorsteuerelektronik drehzahlsteuerbarer kollektor- und schleifringloser Elektromotor, bspw. ein geschalteter Reluktanzmotor, insbesondere im Falle einer, von einem mit dem Gehäuse verbundenen Sensor und einem Mikrocontroller registrierten, zukünftig zu erwartenden unzulässigen Verdrehung, über die Motorsteuerelektronik bezüglich der Drehzahl heruntergebremst, wodurch bei Unterschreitung einer Kupplungsdrehzahl eine im Kraftübertragungsweg zwischen dem Elektromotor und einem Getriebe angeordnete, rein mechanische, fliehkraftgesteuerte Kupplung zur Übertragung des Drehmomentes die Kraftübertragung trennt.Essentially, a speed-controllable via a motor control electronics collector and slip-ring electric motor, for example, a switched reluctance motor, especially in the case of a, from a sensor connected to the housing and a microcontroller registered future expected inadmissible rotation, braked down via the engine control electronics with respect to the speed whereby, when falling below a clutch speed arranged in the power transmission path between the electric motor and a transmission, purely mechanical, centrifugally controlled clutch for transmitting the torque separates the power transmission.

Die über eine Motorsteuerelektronik drehzahlsteuerbaren kollektor- und schleifringlosen Elektromotoren können schnell aktiv gebremst werden, wodurch ein unzulässig langes Nachlaufen sicher verhindert werden kann.The speed-controllable via a motor control electronics collector and slip-ring electric motors can be actively braked quickly, whereby an unacceptably long hunting can be safely prevented.

Ein weiterer Vorteil dieser Lösung besteht zudem im Entfallen der ansonsten für die Sicherheitsroutine benötigten verwendeten elektromechanischen Kupplung, wodurch das Gewicht und Herstellungskosten reduziert werden.Another advantage of this solution is also the elimination of the electromechanical coupling otherwise required for the safety routine, thereby reducing weight and manufacturing costs.

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

Nach Fig. 1 weist ein Bohrhammer als Elektrohandwerkzeuggerät 1 innerhalb eines Gehäuses 2 einen über eine Motorsteuerelektronik 3 drehzahlsteuerbaren kollektor- und schleifringlosen Elektromotor 4, insbesondere einen geschalteten Reluktanzmotor, welcher im Kraftübertragungsweg über eine rein mechanische, drehzahlabhängige Kupplung 5 zur Übertragung des Drehmoments mit einem Getriebe 6 verbunden ist, auf. Zudem ist das Gehäuse 2 mit einem, von einem Mikrocontroller ausgewerteten, Sensor 7 zur Erfassung einer zukünftigen, unzulässig hohen, Verdrehung des Gehäuses 2 verbunden.According to Fig. 1, a rotary hammer as electric hand tool 1 within a housing 2 via a motor control electronics 3 speed controllable collector and slip-ring electric motor 4, in particular a switched reluctance motor, which in the power transmission via a purely mechanical, speed-dependent clutch 5 for transmitting the torque with a transmission 6 is connected to. In addition, the housing 2 is connected to a, evaluated by a microcontroller, sensor 7 for detecting a future, inadmissibly high, rotation of the housing 2.

Das Verfahren zur Begrenzung einer unzulässig hohen Verdrehung des Gehäuses im Falle einer Werkzeugblockade beinhaltet

  • in einem ersten Schritt im Falle einer, von dem Mikrocontroller mit Sensor registrierten, zukünftig zu erwartenden unzulässigen Verdrehung, die Auslösung eines Sicherheitssignals durch den Mikrocontroller,
  • in einem zweiten Schritt die Abbremsung der Drehzahl des drehzahlsteuerbaren kollektor- und schleifringlosen Elektromotors über die Motorsteuerelektronik,
  • in einem weiteren Schritt bei Unterschreitung der Kupplungsdrehzahl die Unterbrechung des Kraftübertragungsweges bezüglich der Übertragung des Drehmoments durch die drehzahlabhängige Kupplung,
  • sowie in einem optionalen letzten Schritt die Abfrage und Auswertung des Fortbestehens des Sicherheitssignals vor einer Beschleunigung des Elektromotors durch die Motorsteuerelektronik, wodurch im Falle einer Startblockade ein Anlaufen des Elektromotors und somit eine unzulässig hohe Verdrehung des Gehäuses sicher verhindert wird.
The method for limiting an inadmissibly high rotation of the housing in the case of a tool block includes
  • in a first step, in the case of an inadmissible rotation, which is to be expected in the future, recorded by the microcontroller with sensor, the triggering of a safety signal by the microcontroller,
  • in a second step, the deceleration of the speed of the speed-controllable collector and slip ringless electric motor via the engine control electronics,
  • in a further step, when the clutch speed is undershot, the interruption of the power transmission path with respect to the transmission of the torque by the speed-dependent clutch,
  • and in an optional last step the interrogation and evaluation of the continuation of the safety signal before acceleration of the electric motor by the engine control electronics, which in the case of a start blockage start of the electric motor and thus an inadmissibly high rotation of the housing is reliably prevented.

Claims (5)

  1. Electric hand tool for providing drive to a tool executing at least in part a rotary motion, which comprises, inside a housing (2), a torque-generating, collector-less and slip-ring-less, electric motor (4) whose speed is controllable by motor control electronics (3), characterized in that a speed-governed clutch (5) for transmitting torque is arranged in the power train from the electric motor (4) to a gear (6).
  2. Electric hand tool according to Claim 1, characterized in that the housing (2) is connected to a sensor (7) for detecting a potentially excessive twisting of the housing (2).
  3. Electric hand tool according to Claim 1 or Claim 2, characterized in that the electric motor (4) is a switched reluctance motor.
  4. Method for an electric hand tool according to Claim 2 or Claim 3 for limiting an excessive twisting of the housing (2) in the event of jamming of the tool, characterized in that
    in a first step, when potential excessive twisting is recorded by the sensor (7), a safety signal is triggered,
    in a second step, the speed of the speed-controllable collector-less and slip-ring-less electric motor (4) is braked by the motor control electronics (3), and
    in a further step, once the speed falls below a coupling threshold, the power train, in respect of transmission of torque through the speed-governed clutch (5), is interrupted.
  5. Method according to Claim 4, characterized in that
    in a final step, before acceleration of the electric motor (4) by the motor control electronics (3), the continuance of the safety signal is ascertained and evaluated.
EP01810392A 2000-05-02 2001-04-23 Rotatable electric hand tool with security system Expired - Lifetime EP1151828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10021356A DE10021356A1 (en) 2000-05-02 2000-05-02 Rotating electric hand tool device with safety routine has revolution rate dependent coupling in force transfer path from electric motor to gearbox for transferring torque
DE10021356 2000-05-02

Publications (2)

Publication Number Publication Date
EP1151828A1 EP1151828A1 (en) 2001-11-07
EP1151828B1 true EP1151828B1 (en) 2007-09-12

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EP01810392A Expired - Lifetime EP1151828B1 (en) 2000-05-02 2001-04-23 Rotatable electric hand tool with security system

Country Status (5)

Country Link
US (1) US7011165B2 (en)
EP (1) EP1151828B1 (en)
JP (1) JP4885369B2 (en)
CN (1) CN1186174C (en)
DE (2) DE10021356A1 (en)

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Also Published As

Publication number Publication date
EP1151828A1 (en) 2001-11-07
DE50112984D1 (en) 2007-10-25
JP4885369B2 (en) 2012-02-29
CN1186174C (en) 2005-01-26
US7011165B2 (en) 2006-03-14
DE10021356A1 (en) 2001-11-08
JP2002036142A (en) 2002-02-05
CN1321568A (en) 2001-11-14
US20010042630A1 (en) 2001-11-22

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