EP1201373A2 - Safety circuit for a rotary electric hand tool - Google Patents

Safety circuit for a rotary electric hand tool Download PDF

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Publication number
EP1201373A2
EP1201373A2 EP01810977A EP01810977A EP1201373A2 EP 1201373 A2 EP1201373 A2 EP 1201373A2 EP 01810977 A EP01810977 A EP 01810977A EP 01810977 A EP01810977 A EP 01810977A EP 1201373 A2 EP1201373 A2 EP 1201373A2
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EP
European Patent Office
Prior art keywords
safety circuit
circuit according
functional unit
rate sensor
electric drive
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Granted
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EP01810977A
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German (de)
French (fr)
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EP1201373A3 (en
EP1201373B1 (en
Inventor
Peter Hellmann
Claus Osselmann
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Hilti AG
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Hilti AG
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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 circuit for an at least partially rotating Electric hand tool device such as a drill or hammer drill.
  • the vibration is in a rotating electric hand tool device measured across the axis of rotation via an acceleration sensor and over time in considered a predefined time interval. Does not occur within this time interval Zero crossing, which is necessary and therefore characteristic of a stable angular position Axis of rotation, the power flow from the electric drive to the work spindle is sensor-controlled interrupted. High rotational accelerations cannot within the time interval be recognized.
  • a hammer drill in tool blockages generally either a rotation angle, a Rotation speed or a rotational acceleration sensor used.
  • the current state is evaluated.
  • the rotational acceleration is with a rotational acceleration sensor measured and for a predefined future time interval after an analog or digitally implemented, in each case frequency band limited, integration of the expected future deflection angle of the housing is calculated, which after exceeding a Limit value leads to the interruption of the power flow.
  • a measurement based on the Coriolis force is generally made Piezoceramic rotation rate sensor used to determine the speed of rotation.
  • the object of the invention is to reduce the implementation of one on the future deflection angle based, safety circuit to interrupt the Force flow of a rotating electrical hand tool device in case of tool blockages required components.
  • the rotation rate sensor is advantageous as an active, fully integrated, piezoceramic or on Silicon-based sensor executed, which works based on the Coriolis force, whereby little space and only an external circuit limited to the power supply necessary is.
  • the measured value is advantageous using an intermediate low-pass filter with a Cut-off frequency between 10 Hz and 100 Hz to suppress high-frequency acceleration peaks filtered, which is particularly useful when working with rock occur.
  • An analog low-pass filter is also advantageously implemented using an RC combination.
  • the measured value is further advantageous via an intermediate high-pass filter, which in connection with a subsequent resistor is dimensioned accordingly
  • Capacitor can be run with a cutoff frequency between 0.5 Hz and 10 Hz filtered to suppress the user's choice of guiding movement, which must not trigger an interruption in the flow of power.
  • a weighted one is advantageous between the rotation rate sensor and the comparison member Summing element, which for example consists of a resistance voltage divider, with a arranged upstream integrator, which, for example. From above the cutoff frequency operated RC low pass.
  • the weighted summing element proportional to the angle of rotation and proportional to the rotational speed
  • the measured value of the rotation rate sensor digitized via an A / D converter is shown in one, preferably periodically or interrupt-controlled when switched on, Microcontrollers can be evaluated using customary software algorithms, which is advantageous Summing element as a numerical addition, the integrating element as an incremental extension Sum and the filters over weighted, incrementally sliding partial sums are realized.
  • the one derived after comparison with a predetermined threshold value advantageously interrupts Control signal via a controllable circuit breaker the current path of the electric drive and / or a controllable coupling unit the power flow from the electric drive to the tool spindle.
  • FIG. 1 shows an electric hand tool device 1 rotating about an axis of rotation A. Interruption of the power flow from an electric drive 2 to a rotating tool spindle 3 a coupling means 4 controllable via a control signal ⁇ , one via the Control signal ⁇ controllable circuit breaker 5 in the current path of the electric drive 2 and an analog safety circuit 6 with one, the rotational speed ⁇ directly measuring, rotation rate sensor 7.
  • the output is the speed of rotation ⁇ measuring rotation rate sensor 7 signal-transmitting with a as a comparator executed comparator 8 connected, which to the rotational speed ⁇ at least partially proportional measured value M to a preselectable threshold value S compares.
  • an analog function unit 9 arranged with a temporally determined transfer function.
  • Components C2 and R2 form a high pass filter with the transfer function:
  • the components R3 and C3 form an integrator, which is implemented as a low-pass filter operated above its cut-off frequency of 0.01 Hz.
  • the resulting measurement signal M ' is compared with a threshold value S as a switch-off condition. If necessary, this leads to separation of the drive train.
  • the microcontroller which is digitally implemented as a software program and which is arranged between an analog-digital converter (ADC) and a digital-analog converter (DAC) and triggered when the electric drive is switched on contains a digital high-pass filter as functional sub-blocks I, in which the input signal is standardized via a multiplier with 1 / E, a digital low-pass filter II, an integrator III and a weighted summing element IV for weighting the rotational speed ⁇ with the factor Tau.
  • ADC analog-digital converter
  • DAC digital-analog converter

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Portable Power Tools In General (AREA)
  • Keying Circuit Devices (AREA)
  • Gyroscopes (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The circuit generates a control signal (theta) when the intended deflection angle of the housing of an at least partly rotating electric hand tool is exceeded. A turn rate sensor (7) that directly measures the revolution rate is connected to a comparison element (8). The turn rate sensor is an active sensor that operates on the basis of the Coriolis force.

Description

Die Erfindung bezeichnet eine Sicherheitsschaltung für ein zumindest teilweise drehendes Elektrohandwerkzeuggerät wie eine Bohrmaschine oder einen Bohrhammer.The invention relates to a safety circuit for an at least partially rotating Electric hand tool device such as a drill or hammer drill.

Zur Vermeidung von unzulässigen Verdrehungen des Handgriffs des Gehäuses, bspw. verursacht durch Werkzeugblockaden, wird der Kraftfluss vom Elektroantrieb zur Arbeitsspindel durch Sicherheitskupplungen unterbrochen.To avoid inadmissible twisting of the handle of the housing, e.g. caused by tool blockages, the power flow from the electric drive to the work spindle interrupted by safety clutches.

Nach der DE4334933A1 wird in einem drehenden Elektrohandwerkzeuggerät die Vibration quer zur Drehachse über einen Beschleunigungssensor gemessen und über die Zeit in einem vordefinierten Zeitintervall betrachtet. Erfolgt nicht innerhalb dieses Zeitintervalls ein Nulldurchgang, was notwendig und somit charakteristisch für eine stabile Winkellage zur Drehachse ist, wird der Kraftfluss vom Elektroantrieb zur Arbeitsspindel sensorgesteuert unterbrochen. Innerhalb des Zeitintervalls können hohe Rotationsbeschleunigungen nicht erkannt werden.According to DE4334933A1, the vibration is in a rotating electric hand tool device measured across the axis of rotation via an acceleration sensor and over time in considered a predefined time interval. Does not occur within this time interval Zero crossing, which is necessary and therefore characteristic of a stable angular position Axis of rotation, the power flow from the electric drive to the work spindle is sensor-controlled interrupted. High rotational accelerations cannot within the time interval be recognized.

Nach der DE3707052 wird zur Vermeidung von unzulässigen Verdrehungen des Handgriffs eines Bohrhammers bei Werkzeugblockaden allgemein entweder ein Rotationswinkel-, ein Rotationsgeschwindigkeits- oder ein Rotationsbeschleunigungssensor verwendet. Zur Unterbrechung des Kraftflusses wird der gerade-vorliegende Zustand ausgewertet.According to DE3707052, to avoid unauthorized twisting of the handle a hammer drill in tool blockages generally either a rotation angle, a Rotation speed or a rotational acceleration sensor used. to Interruption of the power flow, the current state is evaluated.

Nach der DE4334933A1 wird mit einem Rotationsbeschleunigungssensor die Rotationsbeschleunigung gemessen und für ein vordefiniertes zukünftiges Zeitintervall nach einer analog oder digital realisierten, jeweils frequenzbandbegrenzten, Integration der voraussichtliche zukünftige Auslenkwinkel des Gehäuses berechnet, welcher nach Überschreitung eines Grenzwertes zur Unterbrechung des Kraftflusses führt.According to DE4334933A1, the rotational acceleration is with a rotational acceleration sensor measured and for a predefined future time interval after an analog or digitally implemented, in each case frequency band limited, integration of the expected future deflection angle of the housing is calculated, which after exceeding a Limit value leads to the interruption of the power flow.

Des weiteren wird nach der US5247252 allgemein ein auf Basis der Corioliskraft messender piezokeramischer Drehratensensor zur Bestimmung der Rotationsgeschwindigkeit verwendet. Furthermore, according to US5247252, a measurement based on the Coriolis force is generally made Piezoceramic rotation rate sensor used to determine the speed of rotation.

Die Aufgabe der Erfindung besteht in der Verringerung der zur Realisierung einer, auf dem zukünftigen Auslenkwinkel basierenden, Sicherheitsschaltung zur Unterbrechung des Kraftflusses eines drehenden Elektrohandwerkzeuggerätes bei Werkzeugblockaden benötigten Bauteile.The object of the invention is to reduce the implementation of one on the future deflection angle based, safety circuit to interrupt the Force flow of a rotating electrical hand tool device in case of tool blockages required components.

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 ist zur Erzeugung des Steuersignals zur Unterbrechung des Kraftflusses und/oder des Strompfades eines drehenden Elektrohandwerkzeuggerätes ein die Rotationsgeschwindigkeit direkt messender Drehratensensor und ein mit dem Sensorausgang verbundenes, den zur Rotationsgeschwindigkeit zumindest teilweise proportionalen Messwert zu einem Schwellwert vergleichendes, Vergleichsglied miteinander verbunden.It is essentially used to generate the control signal to interrupt the power flow and / or the current path of a rotating electric hand tool device, the rotational speed direct measuring rotation rate sensor and one with the sensor output connected measurement value, which is at least partially proportional to the rotational speed to form a threshold comparing comparator connected to each other.

Mit der bei drehenden Elektrohandwerkzeuggeräten durch die Masseträgheit der rotierenden Bauteile des Antriebsstrangs zulässigen Näherung einer konstanten Rotationsbeschleunigung während des mit 1 ms bis 100 ms (vorteilhaft ca. 20ms) kurzen zukünftigen Zeitintervalls, berechnet sich der, zur Vereinfachung vorteilhaft am Anfang des Zeitintervalls jeweils zu Null gesetzte, Drehwinkel nach der linearen Bewegungsgleichung für gleichförmige Drehbewegungen näherungsweise proportional zur direkt gemessenen Rotationsgeschwindigkeit, wodurch ein, eine Integration einer Rotationsbeschleunigung enthaltender, Term in der Funktionseinheit nicht realisiert werden muss.With the rotating electrical hand tool devices due to the inertia of the rotating Components of the drive train allowable approximation of a constant rotational acceleration during the short future time interval with 1 ms to 100 ms (advantageously approx. 20 ms), For simplification, this is calculated at the beginning of the time interval zeroed rotation angle according to the linear equation of motion for uniform Rotational movements approximately proportional to the directly measured rotational speed, whereby a term containing an integration of a rotational acceleration in the functional unit does not have to be implemented.

Der Drehratensensor ist vorteilhaft als aktiver, vollintegrierter, piezokeramischer oder auf Silizium basierender Sensor ausgeführt, welcher auf Basis der Corioliskraft arbeitet, wodurch wenig Raum und nur eine auf die Stromversorgung begrenzte externe Beschaltung notwendig ist.The rotation rate sensor is advantageous as an active, fully integrated, piezoceramic or on Silicon-based sensor executed, which works based on the Coriolis force, whereby little space and only an external circuit limited to the power supply necessary is.

Vorteilhaft wird der Messwert über einen zwischengeschalteten Tiefpassfilter mit einer Grenzfrequenz zwischen 10 Hz und 100 Hz zur Unterdrückung hochfrequenter Beschleunigungsspitzen gefiltert, welche insbesondere bei schlagunterstützter Bearbeitung von Gestein auftreten. Ein analoger Tiefpassfilter ist weiter vorteilhaft über eine RC-Kombination realisiert.The measured value is advantageous using an intermediate low-pass filter with a Cut-off frequency between 10 Hz and 100 Hz to suppress high-frequency acceleration peaks filtered, which is particularly useful when working with rock occur. An analog low-pass filter is also advantageously implemented using an RC combination.

Weiter vorteilhaft wird der Messwert über einen zwischengeschalteten Hochpassfilter, welcher in Verbindung mit einem nachfolgenden Widerstand als entsprechend dimensionierter Kondensator ausgeführt werden kann, mit einer Grenzfrequenz zwischen 0,5 Hz und 10 Hz zur Unterdrückung der gewillkürten Führungsbewegung des Nutzers gefiltert, welche kein Unterbrechung des Kraftflusses auslösen darf.The measured value is further advantageous via an intermediate high-pass filter, which in connection with a subsequent resistor is dimensioned accordingly Capacitor can be run with a cutoff frequency between 0.5 Hz and 10 Hz filtered to suppress the user's choice of guiding movement, which must not trigger an interruption in the flow of power.

Vorteilhaft ist zwischen dem Drehratensensor und dem Vergleichsglied ein gewichtetes Summierglied, welches bspw. aus einem Widerstandsspannungsteiler besteht, mit einem vorgeschalteten Integrierglied angeordnet, welches bspw. aus einem oberhalb der Grenzfrequenz betriebenem RC-Tiefpass besteht. Durch die nunmehr am gewichteten Summierglied proportional zum Drehwinkel und proportional zur Rotationsgeschwindigkeit vorliegenden beiden Zeitfunktionen ist die allgemeine Lösung zur Vorausberechnung des zukünftigen Drehwinkels auch bei von Null verschiedenen Randbedingungen näherungsweise elektronisch realisiert, wodurch dem Nutzer innerhalb fest überwachter Grenzwerte ein Drehwinkelintervall gewährt wird, dessen Ausgangspunkt vorteilhaft zum Einschaltzeitpunkt des Elektroantriebs bestimmt wird.A weighted one is advantageous between the rotation rate sensor and the comparison member Summing element, which for example consists of a resistance voltage divider, with a arranged upstream integrator, which, for example. From above the cutoff frequency operated RC low pass. By now on the weighted summing element proportional to the angle of rotation and proportional to the rotational speed Both time functions is the general solution for predicting the future Angle of rotation approximately electronically even with non-zero boundary conditions realized, whereby the user an angle of rotation interval within firmly monitored limit values is granted, the starting point advantageous at the time the Electric drive is determined.

Alternativ wird der über einen A/D-Wandler digitalisierte Messwert des Drehratensensors in einem, vorzugsweise zeitlich periodisch oder beim Einschalten interruptgesteuerten, Mikrocontroller mit üblichen Softwarealgorithmen ausgewertet werden, wobei vorteilhaft das Summierglied als über eine numerische Addition, das Integrierglied als inkrementell erweiterte Summe und die Filter über gewichtete, inkrementell gleitend gefüllte Partialsummen realisiert sind.Alternatively, the measured value of the rotation rate sensor digitized via an A / D converter is shown in one, preferably periodically or interrupt-controlled when switched on, Microcontrollers can be evaluated using customary software algorithms, which is advantageous Summing element as a numerical addition, the integrating element as an incremental extension Sum and the filters over weighted, incrementally sliding partial sums are realized.

Vorteilhaft unterbricht das nach Vergleich mit einem vorbestimmten Schwellwert abgeleitete Steuersignal über einen steuerbare Leistungsschalter den Strompfad des Elektroantriebs und/oder eine steuerbare Kupplungseinheit den Kraftfluss vom Elektroantrieb zur Werkzeugspindel.The one derived after comparison with a predetermined threshold value advantageously interrupts Control signal via a controllable circuit breaker the current path of the electric drive and / or a controllable coupling unit the power flow from the electric drive to the tool spindle.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als drehendes Elektrohandwerkzeuggerät mit Sicherheitsschaltung
  • Fig. 2 als analoge Sicherheitsschaltung
  • Fig. 3 als digitale Sicherheitsschaltung
    • The invention is explained in more detail with respect to an advantageous exemplary embodiment with:
  • Fig. 1 as a rotating electric hand tool device with safety circuit
  • Fig. 2 as an analog safety circuit
  • Fig. 3 as a digital safety circuit

    • Nach Fig. 1 weist ein um eine Drehachse A drehendes Elektrohandwerkzeuggerät 1 zur Unterbrechung des Kraftflusses von einem Elektroantrieb 2 zu einer drehenden Werkzeugspindel 3 ein über ein Steuersignals  steuerbares Kupplungsmittel 4, einen über das Steuersignals  steuerbaren Leistungsschalter 5 im Strompfad des Elektroantriebs 2 und eine analoge Sicherheitsschaltung 6 mit einem, die Rotationsgeschwindigkeit ω direkt messenden, Drehratensensor 7 auf. 1 shows an electric hand tool device 1 rotating about an axis of rotation A. Interruption of the power flow from an electric drive 2 to a rotating tool spindle 3 a coupling means 4 controllable via a control signal , one via the Control signal  controllable circuit breaker 5 in the current path of the electric drive 2 and an analog safety circuit 6 with one, the rotational speed ω directly measuring, rotation rate sensor 7.

    Nach Fig. 2 ist bei einer analogen Sicherheitsschaltung 6 der Ausgang des die Rotationsgeschwindigkeit ω messenden Drehratensensors 7 signalübertragend mit einem als Komparator ausgeführten Vergleichsglied 8 verbunden, welcher den zur Rotationsgeschwindigkeit ω zumindest teilweise proportionalen Messwert M zu einem vorwählbaren Schwellwert S vergleicht. Zwischen dem Drehratensensor 7 und dem mit dem Einschaltzeitpunkt des Elektroantriebs getriggerten Vergleichsglied 8 ist eine analog ausgeführte Funktionseinheit 9 mit einer zeitlich bestimmten Übertragungsfunktion angeordnet.According to FIG. 2, in the case of an analog safety circuit 6, the output is the speed of rotation ω measuring rotation rate sensor 7 signal-transmitting with a as a comparator executed comparator 8 connected, which to the rotational speed ω at least partially proportional measured value M to a preselectable threshold value S compares. Between the rotation rate sensor 7 and the one with the switch-on time Comparator 8 triggered by the electric drive is an analog function unit 9 arranged with a temporally determined transfer function.

    Die Bauteile R1 und C1 bilden einen Tiefpassfilter mit der Übertragungsfunktion: ATP (s) = 11 + sR 1 C 1 mit s = σ + jω (komplexe Kreisfrequenz)
    und der oberen Grenzfrequenz fg = 1 / 2πR 1 C 1 von auf 10Hz.    Components R1 and C1 form a low pass filter with the transfer function: A TP ( s ) = 1 1 + sR 1 C 1 with s = σ + j ω (complex angular frequency)
    and the upper limit frequency f g = 1 / 2π R 1 C 1 from to 10 Hz.

    Die Bauteile C2 und R2 bilden einen Hochpassfilter mit der Übertragungsfunktion: AHP (s) = 11 + 1 sR 2 C 2 und der unteren Grenzfrequenz fg = 1 / 2πR 2 C 2 von 0.5Hz.Components C2 and R2 form a high pass filter with the transfer function: A HP ( s ) = 1 1 + 1 sR 2 C 2 and the lower cut-off frequency f g = 1 / 2π R 2 C 2 of 0.5 Hz.

    Die Bauteile R3 und C3 bilden einen Integrator, welcher als oberhalb seiner Grenzfrequenz von 0.01 Hz betriebener Tiefpass realisiert ist. Die Widerstände R4, R5 und R6 bilden in ihrer Kombination ein Addierglied, wobei gilt R 4 = R 5 = R 6. Im Vergleichsglied 8 wird das resultierende Messsignal M' mit einem Schwellwert S als Ausschaltbedingung verglichen. Dies führt im Bedarfsfall zur Trennung des Antriebsstranges.The components R3 and C3 form an integrator, which is implemented as a low-pass filter operated above its cut-off frequency of 0.01 Hz. In their combination, the resistors R4, R5 and R6 form an adder, where R 4 = R 5 = R 6 . In the comparator 8, the resulting measurement signal M 'is compared with a threshold value S as a switch-off condition. If necessary, this leads to separation of the drive train.

    Nach Fig. 3 beinhaltet die als Softwareprogramm eines zwischen einem Analog-Digital-Konverter (ADC) und einem Digital-Analog-Konverter (DAC) angeordneten Mikrocontrollers digital realisierte, mit dem Einschaltzeitpunkt des Elektroantriebs getriggerte, Funktionseinheit 9' als funktionelle Unterblöcke einen digitalen Hochpassfilter I, bei welchem zuvor das Eingangsignal über einen Multiplikator mit 1/E normiert wird, einen digitalen Tiefpassfilter II, einen Integrator III und ein gewichtetes Summierglied IV zur Gewichtung der Rotationsgeschwindigkeit ω mit dem Faktor Tau. Die Übertragungsfunktionen der funktionellen Unterblöcke berechnen sich beim Hochpassfilter I nach AHP (s)= s / s+ ω HP , beim Tiefpassfilter II nach ATP (s)= ω TP / s + ω TP und beim Integrator III nach AInt (s) = 1 / s +ω Int wobei sich die Grenzfrequenzen jeweils aus fg = 1 / 2πω berechnen. Für das gewichtete Summierglied IV beträgt Tau ungefähr 0.02.According to FIG. 3, the microcontroller which is digitally implemented as a software program and which is arranged between an analog-digital converter (ADC) and a digital-analog converter (DAC) and triggered when the electric drive is switched on contains a digital high-pass filter as functional sub-blocks I, in which the input signal is standardized via a multiplier with 1 / E, a digital low-pass filter II, an integrator III and a weighted summing element IV for weighting the rotational speed ω with the factor Tau. The transfer functions of the functional sub-blocks are calculated for high-pass filter I according to A HP ( s ) = s / s + ω HP , for low-pass filter II according to A TP ( s ) = ω TP / s + ω TP and for integrator III according to A Int ( see ) = 1 / s + ω Int where the cut-off frequencies are calculated from f g = 1 / 2πω. For the weighted summator IV, tau is approximately 0.02.

    Claims (10)

    Sicherheitsschaltung zur Generierung eines Steuersignals () bei Überschreitung des zukünftigen Auslenkwinkels des Gehäuses eines zumindest teilweise drehenden Elektrohandwerkzeuggerätes (1), dadurch gekennzeichnet, dass ein die Rotationsgeschwindigkeit (ω) direkt messender Drehratensensor (7) signalübertagend mit einem Vergleichsglied (8) verbunden ist.Safety circuit for generating a control signal () when the future deflection angle of the housing of an at least partially rotating electric hand tool device (1) is exceeded, characterized in that a rotation rate sensor (7) which directly measures the rotation speed (ω) is connected to a comparator (8) in a signal-transmitting manner. Sicherheitsschaltung nach Anspruch 1, dadurch gekennzeichnet, dass der Drehratensensor (7) als auf Basis der Corioliskraft messender aktiver Sensor ausgeführt ist.Safety circuit according to claim 1, characterized in that the rotation rate sensor (7) is designed as an active sensor based on the Coriolis force. Sicherheitsschaltung nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass zwischen dem Drehratensensor (7) und dem Vergleichsglied (8) eine Funktionseinheit (9, 9') signalübertragend angeordnet ist.Safety circuit according to Claim 1 or Claim 2, characterized in that a functional unit (9, 9 ') is arranged between the rotation rate sensor (7) and the comparison element (8) in a signal-transmitting manner. Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Funktionseinheit (9) ein gewichtetes Summierglied (IV) mit einem an einem Eingang vorgeschalteten Integrierglied (III) beinhaltet.Safety circuit according to one of the preceding claims, characterized in that the functional unit (9) contains a weighted summing element (IV) with an integrating element (III) connected upstream at an input. Sicherheitsschaltung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Funktionseinheit (9) ohne Mittel zur Integration der Rotationsbeschleunigung (ω) ausgeführt ist.Safety circuit according to one of claims 1 to 3, characterized in that the functional unit (9) is designed without means for integrating the rotational acceleration (ω). Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Funktionseinheit (9) einen Tiefpassfilter (II) mit einer Grenzfrequenz zwischen 10 und 100 Hz beinhaltet.Safety circuit according to one of the preceding claims, characterized in that the functional unit (9) contains a low-pass filter (II) with a cutoff frequency between 10 and 100 Hz. Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Funktionseinheit (9) einen Hochpassfilter (I) mit einer Grenzfrequenz zwischen 0,5 und 10 Hz beinhaltet.Safety circuit according to one of the preceding claims, characterized in that the functional unit (9) contains a high-pass filter (I) with a cut-off frequency between 0.5 and 10 Hz. Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Ausgangspunkt bei der Berechnung des Steuersignals () zum Einschaltzeitpunkt des Elektroantriebs (2) bestimmbar ist. Safety circuit according to one of the preceding claims, characterized in that the starting point in the calculation of the control signal () can be determined at the time the electric drive (2) is switched on. Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Funktionseinheit (9') über Softwarealgorithmen eines Mikrocontrollers ausgeführt ist.Safety circuit according to one of the preceding claims, characterized in that the functional unit (9 ') is implemented via software algorithms of a microcontroller. Sicherheitsschaltung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass über das, in dem Vergleichsglied (8) nach Vergleich des Messwertes (M, M') mit einem vorbestimmten Schwellwert (S) erzeugte, Steuersignal () über einen steuerbaren Leistungsschalter (5) der Strompfad eines Elektroantriebs (2) und/oder sowie optional gleichzeitig über eine steuerbare Kupplungseinheit (4) der Kraftfluss vom Elektroantrieb (2) zu einer Werkzeugspindel (3) unterbrechbar ist.Safety circuit according to one of the preceding claims, characterized in that the control signal () generated in the comparison element (8) after comparison of the measured value (M, M ') with a predetermined threshold value (S) via a controllable circuit breaker (5) the current path of an electric drive (2) and / or and optionally simultaneously via a controllable coupling unit (4) the flow of power from the electric drive (2) to a tool spindle (3) can be interrupted.
    EP01810977A 2000-10-19 2001-10-08 Safety circuit for a rotary electric hand tool Expired - Lifetime EP1201373B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10051775A DE10051775A1 (en) 2000-10-19 2000-10-19 Safety circuit for rotating electrical hand tool device
    DE10051775 2000-10-19

    Publications (3)

    Publication Number Publication Date
    EP1201373A2 true EP1201373A2 (en) 2002-05-02
    EP1201373A3 EP1201373A3 (en) 2006-05-03
    EP1201373B1 EP1201373B1 (en) 2008-09-24

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01810977A Expired - Lifetime EP1201373B1 (en) 2000-10-19 2001-10-08 Safety circuit for a rotary electric hand tool

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    EP1802845A2 (en) * 2004-10-20 2007-07-04 BLACK & DECKER INC. Power tool anti-kickback system with rotational rate sensor
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    EP1201373A3 (en) 2006-05-03
    EP1201373B1 (en) 2008-09-24
    CN1207132C (en) 2005-06-22
    CN1349873A (en) 2002-05-22
    DE10051775A1 (en) 2002-05-16
    JP2002216599A (en) 2002-08-02
    DE50114345D1 (en) 2008-11-06
    US20040011632A1 (en) 2004-01-22

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