EP0150669A2 - Hand tool with movable inertia mass - Google Patents

Hand tool with movable inertia mass Download PDF

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Publication number
EP0150669A2
EP0150669A2 EP84810594A EP84810594A EP0150669A2 EP 0150669 A2 EP0150669 A2 EP 0150669A2 EP 84810594 A EP84810594 A EP 84810594A EP 84810594 A EP84810594 A EP 84810594A EP 0150669 A2 EP0150669 A2 EP 0150669A2
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EP
European Patent Office
Prior art keywords
mass
container
magnetic field
liquid
permanent magnet
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
EP84810594A
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German (de)
French (fr)
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EP0150669A3 (en
EP0150669B1 (en
Inventor
Heinz Dr.-Phys. Kousek
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/13—Cutting by use of rotating axially moving tool with randomly-actuated stopping means
    • Y10T408/14—Responsive to condition of Tool or tool-drive

Definitions

  • the invention relates to a motor-operated hand-held device which gives a tool a rotary movement, with a housing and a mass movably mounted therein in a plane running perpendicular to the tool axis.
  • the reaction moment occurring on the tool must be applied by the operator. This is easily manageable in normal operation. For example, when drilling in inhomogeneous material, the drill can suddenly jam and even become blocked. This leads to a rapid increase in the reaction torque, for which the operator is generally not prepared. Under unfavorable conditions, this can lead to injuries to the operator. When working on scaffolding or ladders the danger of a direct-g also is ewichtswes, resulting in a further hazard.
  • a mass is mounted so as to be movable relative to the housing in a plane that is essentially perpendicular to the tool axis.
  • the mass is displaced relative to the housing due to its inertia and actuates a switch.
  • the pulse emitted by the switch when it is actuated can be used, for example, to interrupt the energy supply to the drive motor, for Actuation of a disconnect clutch or a brake can be used.
  • the invention has for its object to provide a simple device for a handheld device that enables a rapid and independent of external influences such as temperature, pollution or the like to detect undesirable torques suddenly acting on the device.
  • the mass is an electrically conductive liquid arranged in a closed, electrically non-conductive container and Means are provided for tapping off the induction which arises during a relative movement of the mass in a magnetic field.
  • the mass By designing the mass as a liquid according to the invention, the mechanical friction, which is dependent on various factors such as lubrication state, temperature and the like, is replaced by the substantially lower liquid friction.
  • the liquid is hermetically sealed in the container.
  • the hand-held device When the hand-held device is suddenly turned around its tool axis, the liquid mass rotates about its own axis due to its inertia relative to the housing.
  • This relative movement of the mass relative to the housing can be determined from the outside as an electrical signal according to the laws of "electromagnetism or the relationship between the current-carrying conductor and the magnetic field.
  • the mass In order to obtain a signal that can be used for further processing, it is expedient for the mass to be at least partially penetrated by the magnetic field.
  • a voltage is induced in the area of the mass penetrated by the magnetic field, which voltage can be measured and used as a signal.
  • a voltage can be applied to the electrically conductive, liquid mass. If this mass moves as a current-carrying conductor through the magnetic field, a field change occurs, which in turn can be measured and used as a signal.
  • electrical coils can be used to generate the magnetic field.
  • these coils mean a loss of energy and also have the disadvantage that they heat up over time during operation. It is therefore advantageous to provide a permanent magnet for generating the magnetic field.
  • a permanent magnet takes up little space and constantly generates a constant magnetic field.
  • the magnetic field can be introduced to the mass via yokes connected to the magnet.
  • Electrodes must be created to measure or apply a voltage to the liquid mass. It is therefore expedient to design the means for tapping the induction as electrodes which are in electrical connection with the liquid. Materials with good electrical conductivity, such as copper, silver or gold, can be used for the electrodes.
  • the electrodes protrude through the wall of the container. However, since there is no relative movement between the electrodes and the container, the passage of the electrodes through the container wall can be sealed without any problems.
  • the mass can move relative to the field by tapping the voltage induced in the mass.
  • the currents that occur are very small and therefore have to be electrically amplified.
  • Another expedient possibility is to arrange the means for tapping the induction on an induction element.
  • This induction element can be an additional coil, for example. If the poles of this second coil are arranged offset to those of a first coil analogous to the construction of an AC meter, a voltage is induced in the second coil when the mass moves relative.
  • a semiconductor component in particular a so-called “Hall element”, can also be used as an induction element for tapping off the induction.
  • various substances can be used as the liquid for the mass, provided that they are conductive.
  • concentrated salt solutions or the like can also be used.
  • a certain minimum weight of the mass is advantageous for the safe functioning of the device.
  • the liquid is mercury.
  • Mercury has a very high density and therefore gives a high moment of inertia.
  • the electrical conductivity of mercury is good and it can no disruptive galvanic potentials arise.
  • the liquid state of matter extends over a wide temperature range and the viscosity is very low. Because of the high surface tension of the mercury, the container, which is preferably made of plastic, is not wetted. Any air bubble in the container would therefore remain stationary and would not be a problem.
  • the drill shown in FIG. 1 has a housing 1 and an associated, laterally projecting handle 2.
  • a switch 3 and a feed line 4 are arranged on the handle 2.
  • a drilling spindle 5 protrudes from the housing 1.
  • the drilling spindle 5 is provided with a chuck 6 for receiving the drilling tools.
  • a container 7 is arranged in the rear area of the housing 1 adjacent to the handle 2.
  • the container 7 is hermetically sealed and, as can be seen in particular from FIG. 2, contains a liquid serving as mass 8.
  • the mass 8 is electrically conductive and should have the highest possible density.
  • Mercury is preferably used for the mass 8.
  • Mercury also has a high surface tension and therefore does not wet the wall of the container 7. Instead of mercury, concentrated salt solutions can also be used.
  • the container 7 is fixedly connected to the housing 1.
  • a permanent magnet 9 is arranged outside the container 7.
  • the permanent magnet 9 is on both sides with a protruding into the area of the container 7 Provide yoke 10.
  • the liquid mass 8 arranged in the container 7 is thus partially penetrated by a magnetic field generated by the permanent magnet 9.
  • electrodes 10, 11 each protrude into the container 7.
  • the electrodes 10, 11 are in electrical connection with the mass 8.
  • the magnet 9 with the two yokes 10 is also fixedly connected to the housing 1.
  • the container 7 is preferably designed as a round box, the axis of which runs parallel to the drilling spindle 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Earth Drilling (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

Das Handgerät weist eine in einem verschlossenen, elektrisch nicht leitenden Behälter (7) angeordnete, elektrisch leitfähige, flüssige Masse (8) auf. Die Masse (8) wird teilweise von einem durch einen Permanentmagneten (9) erzeugten Magnetfeld durchsetzt Bei einer Verdrehung des Gehäuses (1) um die Achse der Bohrspindel (5) entsteht zwischen der Masse (8) und dem Behälter (7) bzw. dem Permanentmagneten (9) eine Relativbewegung. Durch diese Bewegung der Masse (8) in dem vom Permanentmagneten (9) erzeugten Magnetfeld wird in die Masse (8) eine elektrische Spannung induziert, die beispielsweise an in den Behälter (7) ragenden Elektroden (11,12) abgegriffen und als elektrisches Signal verwendet werden kann.

Figure imgaf001
The handheld device has an electrically conductive, liquid mass (8) arranged in a closed, electrically non-conductive container (7). The mass (8) is partially penetrated by a magnetic field generated by a permanent magnet (9). When the housing (1) is rotated about the axis of the drilling spindle (5), the mass (8) and the container (7) or the result Permanent magnet (9) a relative movement. This movement of the mass (8) in the magnetic field generated by the permanent magnet (9) induces an electrical voltage in the mass (8), which is picked up, for example, by electrodes (11, 12) projecting into the container (7) and as an electrical signal can be used.
Figure imgaf001

Description

Die Erfindung betrifft ein motorisch betriebenes Handgerät, das einem Werkzeug eine Drehbewegung erteilt, mit einem Gehäuse und einer darin in einer senkrecht zur Werkzeugachse verlaufenden Ebene beweglich gelagerten Masse.The invention relates to a motor-operated hand-held device which gives a tool a rotary movement, with a housing and a mass movably mounted therein in a plane running perpendicular to the tool axis.

Bei Handgeräten muss das am Werkzeug auftretende Reaktionsmoment von der Bedienungsperson aufgebracht werden. Dieses ist im Normalbetrieb ohne weiteres beherrschbar. Beispielsweise beim Bohren in inhomogenem Material kann der Bohrer jedoch plötzlich klemmen und gar blockiert werden. Dies führt zu einem raschen Ansteigen des Reaktionsmomentes, auf das die Bedienungsperson im allgemeinen nicht vorbereitet ist. Unter ungünstigen Voraussetzungen kann dies zu Verletzungen der Bedienungsperson führen. Bei Arbeiten auf Gerüsten oder Leitern besteht ausserdem die Gefahr eines Gleichgewichtsverlustes, was zu einer weiteren Gefahrenquelle führt.In the case of hand-held devices, the reaction moment occurring on the tool must be applied by the operator. This is easily manageable in normal operation. For example, when drilling in inhomogeneous material, the drill can suddenly jam and even become blocked. This leads to a rapid increase in the reaction torque, for which the operator is generally not prepared. Under unfavorable conditions, this can lead to injuries to the operator. When working on scaffolding or ladders the danger of a direct-g also is ewichtsverlustes, resulting in a further hazard.

Zur Verminderung der genannten Gefahren ist es bekannt, zwischen dem Antriebsmotor und der Werkzeugachse eine bei einem bestimmten Drehmoment ansprechende Kupplung anzuordnen. Das Ansprechen einer solchen, sogenannten Ueberlastkupplung setzt jedoch das Aufbringen eines entsprechenden Gegendrehmomentes durch die Bedienungsperson voraus. Eine solche Kupplung ist somit in erster Linie ein Ueberlastschutz für das Gerät und nur bedingt dazu geeignet, die Bedienungsperson zu schützen.To reduce the dangers mentioned, it is known to use one at a between the drive motor and the tool axis certain torque responsive clutch to arrange. The response of such a so-called overload clutch, however, presupposes the application of a corresponding counter torque by the operator. Such a coupling is therefore primarily an overload protection for the device and is only suitable to a limited extent to protect the operator.

Bei einem weiteren bekannten Gerät ist eine Masse in einer im wesentlichen rechtwinklig zur Werkzeugachse verlaufenden Ebene relativ zum Gehäuse beweglich gelagert. Bei einem aus den vorgenannten Gründen plötzlichen Verdrehen des Gerätes um die Werkzeugachse wird die Masse infolge ihrer Trägheit relativ zum "Gehäuse versetzt und betätigt dabei einen Schalter. Der vom.. Schalter bei dessen Betätigung abgegebene Impuls kann beispielsweise zum Unterbrechen der Energiezufuhr zum Antriebsmotor, zum Betätigen einer Trennkupplung oder einer Bremse verwendet werden.In a further known device, a mass is mounted so as to be movable relative to the housing in a plane that is essentially perpendicular to the tool axis. In the event of a sudden rotation of the device about the tool axis for the aforementioned reasons, the mass is displaced relative to the housing due to its inertia and actuates a switch. The pulse emitted by the switch when it is actuated can be used, for example, to interrupt the energy supply to the drive motor, for Actuation of a disconnect clutch or a brake can be used.

Diese bekannte Einrichtung weist jedoch einige Unsicherheitsfaktoren auf. So tritt bei der Lagerung der Masse Lagerreibung auf, durch welche das Ansprechen des Schalters beeinflusst wird. Andererseits kann die Masse, beispielsweise infolge von Vibrationen, zu Schwingungen angeregt werden, welche zu einem Aufschaukeln und schliesslich zum Betätigen des Schalters führen können, ohne dass dabei ein Blockieren des Werkzeuges eingetreten ist. Das Aufschaukeln der Masse kann zwar durch eine Dämpfung verhindert werden, doch wird durch diese Dämpfung im Falle eines wirklichen Blockierens des Werkzeuges das Betätigen des Schalters zeitlich verzögert.However, this known device has some uncertainty factors. When the mass is stored, bearing friction occurs, which influences the response of the switch. On the other hand, the mass, for example as a result of vibrations, can be excited to vibrate, which can lead to a rocking and finally to the actuation of the switch without the tool locking up. The rocking of the mass can be prevented by damping, but this damping delays actuation of the switch if the tool is really blocked.

Der Erfindung liegt die Aufgabe zugrunde, zu einem Handgerät eine einfache Einrichtung zu schaffen, die ein rasches und von äusseren Einflüssen wie Temperatur, Verschmutzung oder dergleichen unabhängiges Erfassen von unerwünschten, plötzlich auf das Gerät einwirkenden Drehmomenten ermöglicht.The invention has for its object to provide a simple device for a handheld device that enables a rapid and independent of external influences such as temperature, pollution or the like to detect undesirable torques suddenly acting on the device.

Gemäss der Erfindung wird dies dadurch erreicht, dass die Masse eine in einem verschlossenen, elektrisch nicht leitenden Behälter angeordnete, elektrisch leitfähige Flüssigkeit ist und Mittel zum Abgreifen der bei einer Relativ-Bewegung der Masse in einem Magnetfeld entstehenden Induktion vorgesehen sind.According to the invention, this is achieved in that the mass is an electrically conductive liquid arranged in a closed, electrically non-conductive container and Means are provided for tapping off the induction which arises during a relative movement of the mass in a magnetic field.

Durch die erfindungsgemässe Ausbildung der Masse als Flüssigkeit wird die von verschiedenen Faktoren wie Schmierzustand, Temperatur und dergleichen abhängige mechanische Reibung durch die wesentlich geringere Flüssigkeitsreibung ersetzt. Die Flüssigkeit ist im Behälter hermetisch abgeschlossen. Beim plötzlichen Verdrehen des Handgerätes um seine Werkzeugachse dreht sich die flüssige Masse infolge ihrer Trägheit relativ zum Gehäuse um ihre eigene Achse. Diese Relativbewegung der Masse gegenüber dem Gehäuse kann nach den Gesetzmässigkeiten des "Elektromagnetismus bzw dem Zusammenhang von stromdurchflossenem Leiter und Magnetfeld von aussen als elektrisches Signal festgestellt werden.By designing the mass as a liquid according to the invention, the mechanical friction, which is dependent on various factors such as lubrication state, temperature and the like, is replaced by the substantially lower liquid friction. The liquid is hermetically sealed in the container. When the hand-held device is suddenly turned around its tool axis, the liquid mass rotates about its own axis due to its inertia relative to the housing. This relative movement of the mass relative to the housing can be determined from the outside as an electrical signal according to the laws of "electromagnetism or the relationship between the current-carrying conductor and the magnetic field.

Um ein für die weitere Verarbeitung brauchbares Signal zu erhalten, ist es zweckmässig, dass die Masse wenigstens teilweise vom Magnetfeld durchsetzt wird. Bei einer Relativbewegung der Masse gegenüber dem Magnetfeld wird somit in dem vom Magnetfeld durchsetzten Bereich der Masse eine Spannung induziert, die gemessen und als Signal verwendet werden kann.In order to obtain a signal that can be used for further processing, it is expedient for the mass to be at least partially penetrated by the magnetic field. When the mass moves relative to the magnetic field, a voltage is induced in the area of the mass penetrated by the magnetic field, which voltage can be measured and used as a signal.

Als Umkehrung dieses Prinzips kann an die elektrisch leitfähige, flüssige Masse eine Spannung angelegt werden. Bewegt sich diese Masse somit als stromdurchflossener Leiter durch das Magnetfeld, so entsteht eine Feldänderung, die wiederum gemessen und als Signal verwendet werden kann.As a reversal of this principle, a voltage can be applied to the electrically conductive, liquid mass. If this mass moves as a current-carrying conductor through the magnetic field, a field change occurs, which in turn can be measured and used as a signal.

Zur Erzeugung des Magnetfeldes können beispielsweise elektrische Spulen verwendet werden. Diese Spulen bedeuten jedoch einen Energieverlust und weisen ausserdem den Nachteil auf, dass sie sich im Betrieb mit der Zeit erwärmen. Es ist daher vorteilhaft, einen Permanentmagneten zur Erzeugung des Magnetfeldes vorzusehen. Ein Permanentmagnet benötigt wenig Platz und erzeugt dauernd ein gleichbleibendes Magnetfeld. Die Einleitung des Magnetfeldes auf die Masse kann über mit dem Magneten in Verbindung stehende Joche erfolgen.For example, electrical coils can be used to generate the magnetic field. However, these coils mean a loss of energy and also have the disadvantage that they heat up over time during operation. It is therefore advantageous to provide a permanent magnet for generating the magnetic field. A permanent magnet takes up little space and constantly generates a constant magnetic field. The magnetic field can be introduced to the mass via yokes connected to the magnet.

Zum Messen bzw Anlegen einer Spannung an die flüssige Masse müssen Kontaktstellen geschaffen werden. Es ist daher zweckmässig, die Mittel zum Abgreifen der Induktion als mit der Flüssigkeit in elektrischer Verbindung stehende Elektroden auszubilden. Für die Elektroden können elektrisch gut leitfähige Materialien wie Kupfer, Silber oder Gold verwendet werden. Die Elektroden durchragen die Wand des Behälters. Da jedoch keine Relativ-Bewegung zwischen den Elektroden und dem Behälter stattfindet, kann die Durchführung der Elektroden durch die Behälterwandung problemlos abgedichtet werden.Contact points must be created to measure or apply a voltage to the liquid mass. It is therefore expedient to design the means for tapping the induction as electrodes which are in electrical connection with the liquid. Materials with good electrical conductivity, such as copper, silver or gold, can be used for the electrodes. The electrodes protrude through the wall of the container. However, since there is no relative movement between the electrodes and the container, the passage of the electrodes through the container wall can be sealed without any problems.

Wie erwähnt, kann eine Relativbewegung der Masse gegenüber dem Feld durch Abgreifen der in die Masse induzierten Spannung erfolgen. Die dabei auftretenden Ströme sind jedoch sehr gering und müssen daher elektrisch verstärkt werden. Eine weitere zweckmässige Möglichkeit besteht darin, die Mittel zum Abgreifen der Induktion an einem Induktionselement anzuordnen. Dieses Induktionselement kann beispielsweise eine zusätzliche Spule sein. Werden die Pole dieser zweiten Spule zu denjenigen einer ersten Spule analog dem Aufbau eines Wechselstromzählers versetzt angeordnet, so wird bei einer Relativbewegung der Masse in die zweite Spule eine Spannung induziert.As mentioned, the mass can move relative to the field by tapping the voltage induced in the mass. However, the currents that occur are very small and therefore have to be electrically amplified. Another expedient possibility is to arrange the means for tapping the induction on an induction element. This induction element can be an additional coil, for example. If the poles of this second coil are arranged offset to those of a first coil analogous to the construction of an AC meter, a voltage is induced in the second coil when the mass moves relative.

Anstelle einer zweiten Spule kann zum Abgreifen der Induktion jedoch auch ein Halbleiter-Bauelement, insbesondere ein sogenanntes "Hall-Element" als Induktionselement verwendet werden.Instead of a second coil, however, a semiconductor component, in particular a so-called “Hall element”, can also be used as an induction element for tapping off the induction.

Im Prinzip können als Flüssigkeit für die Masse verschiedene Stoffe verwendet werden, sofern diese leitfähig sind. Beispielsweise kommen dafür auch konzentrierte Salzlösungen oder dergleichen in Frage. Für ein sicheres Funktionieren der Einrichtung ist ein bestimmtes Mindestgewicht der Masse von Vorteil. Aufgrund der relativ geringen Dichte von Salzlösungen kann eine grosse Dimensionierung des Behälters erforderlich sein. Um dies zu vermeiden, ist es vorteilhaft, dass die Flüssigkeit Quecksilber ist. Quecksilber besitzt eine sehr hohe Dichte und ergibt somit ein hohes Trägheitsmoment. Die elektrische Leitfähigkeit von Quecksilber ist gut und es können keine störenden galvanischen Potentiale entstehen. Der flüssige Aggregatszustand erstreckt sich über einen weiten Temperaturbereich und die Viskosität ist sehr gering. Wegen der hohen Oberflächenspannung des Quecksilbers wird der vorzugsweise aus Kunststoff bestehende Behälter nicht benetzt. Eine allfällige Luftblase im Behälter bliebe daher ortsfest und würde somit nicht stören.In principle, various substances can be used as the liquid for the mass, provided that they are conductive. For example, concentrated salt solutions or the like can also be used. A certain minimum weight of the mass is advantageous for the safe functioning of the device. Due to the relatively low density of salt solutions, large dimensions of the container may be necessary. To avoid this, it is advantageous that the liquid is mercury. Mercury has a very high density and therefore gives a high moment of inertia. The electrical conductivity of mercury is good and it can no disruptive galvanic potentials arise. The liquid state of matter extends over a wide temperature range and the viscosity is very low. Because of the high surface tension of the mercury, the container, which is preferably made of plastic, is not wetted. Any air bubble in the container would therefore remain stationary and would not be a problem.

Die Erfindung soll nachstehend anhand der sie beispielsweise wiedergebenden Zeichnungen näher erläutert werden. Es zeigen:

  • Fig. 1 ein erfindungsgemässes Bohrgerät, teilweise aufgeschnitten und perspektivisch dargestellt, ..
  • Fig. 2 einen Ausschnitt des in Fig. 1 dargestellten Bohrgerätes, in vergrössertem Massstab.
The invention will be explained in more detail below with reference to the drawings, for example. Show it:
  • 1 a drilling device according to the invention, partially cut open and shown in perspective, ..
  • Fig. 2 shows a detail of the drill shown in Fig. 1, on an enlarged scale.

Das aus Fig. 1 ersichtliche Bohrgerät weist ein Gehäuse 1 sowie einen damit verbundenen, seitlich wegragenden Handgriff 2 auf. Am Handgriff 2 sind ein Schalter 3 sowie eine Zuleitung 4 angeordnet. An dem dem Handgriff 2 entgegengesetzten Ende des Gehäuses 1 ragt eine Bohrspindel 5 aus dem Gehäuse 1. Die Bohrspindel 5 ist mit einem Spannfutter 6 zur Aufnahme der Bohrwerkzeuge versehen.The drill shown in FIG. 1 has a housing 1 and an associated, laterally projecting handle 2. A switch 3 and a feed line 4 are arranged on the handle 2. At the end of the housing 1 opposite the handle 2, a drilling spindle 5 protrudes from the housing 1. The drilling spindle 5 is provided with a chuck 6 for receiving the drilling tools.

Im rückwärtigen, dem Handgriff 2 benachbarten Bereich des Gehäuses 1 ist ein Behälter 7 angeordnet. Der Behälter 7 ist hermetisch verschlossen und enthält, wie insbesondere aus Fig. 2 ersichtlich ist, eine als Masse 8 dienende Flüssigkeit. Die Masse 8 ist elektrisch leitfähig und soll eine möglichst hohe Dichte aufweisen. Für die Masse 8 wird vorzugsweise Quecksilber verwendet. Quecksilber weist ausserdem eine hohe Oberflächenspannung auf und benetzt daher die Wandung des Behälters 7 nicht. Anstelle von Quecksilber können jedoch auch konzentrierte Salzlösungen verwendet werden. Der Behälter 7 ist feststehend mit dem Gehäuse 1 verbunden. Ausserhalb des Behälters 7 ist ein Permanentmagnet 9 angeordnet. Der Permanentmagnet 9 ist beidseitig mit einem in den Bereich des Behälters 7 ragenden Joch 10 versehen. Die im Behälter 7 angeordnete, flüssige Masse 8 wird somit teilweise von einem durch den Permanentmagneten 9 erzeugten Magnetfeld durchsetzt. Im Zentrum sowie am Umfang des Behälters 7 ragen je eine Elektrode 10, 11 in den Behälter 7. Die Elektroden 10, 11 stehen mit der Masse 8 in elektrischer Verbindung. Der Magnet 9 mit den beiden Jochen 10 ist mit dem Gehäuse 1 ebenfalls feststehend verbunden. Der Behälter 7 ist vorzugsweise als runde Dose ausgebildet, deren Achse parallel zur Bohrspindel 5 verläuft.A container 7 is arranged in the rear area of the housing 1 adjacent to the handle 2. The container 7 is hermetically sealed and, as can be seen in particular from FIG. 2, contains a liquid serving as mass 8. The mass 8 is electrically conductive and should have the highest possible density. Mercury is preferably used for the mass 8. Mercury also has a high surface tension and therefore does not wet the wall of the container 7. Instead of mercury, concentrated salt solutions can also be used. The container 7 is fixedly connected to the housing 1. A permanent magnet 9 is arranged outside the container 7. The permanent magnet 9 is on both sides with a protruding into the area of the container 7 Provide yoke 10. The liquid mass 8 arranged in the container 7 is thus partially penetrated by a magnetic field generated by the permanent magnet 9. In the center and on the circumference of the container 7, electrodes 10, 11 each protrude into the container 7. The electrodes 10, 11 are in electrical connection with the mass 8. The magnet 9 with the two yokes 10 is also fixedly connected to the housing 1. The container 7 is preferably designed as a round box, the axis of which runs parallel to the drilling spindle 5.

Bei einer plötzlichen Verdrehung des Bohrgerätes um die Achse der Bohrspindel 5 erfolgt infolge der Massenträgheit eine Relativbewegung zwischen der Masse 8 und dem Behälter 7 bzw dem Permanentmagneten 9. Die Masse 8 wird dabei im Behälter 7 um die zentrale Längsachse des Behälters 7 verdreht. Die Masse 8 bewegt sich somit als Leiter durch das vom Permanentmagneten 9 und den Jochen 10 erzeugte Magnetfeld. Dabei wird in die Masse 8 eine Spannung induziert. Diese Spannung kann an den Elektroden 10, 11 abgegriffen und als Signal zur Auslösung einer bestimmten Funktion, wie beispielsweise Abschalten der Energiezufuhr, Betätigung einer Kupplung oder Bremse, verwendet werden. Zu diesem Zweck sind die Elektroden 11, 12 mit Anschlussleitungen 13, 14 verbunden. Da die Stärke des Signals relativ gering ist, kann, wie in Fig. 2 dargestellt, das Signal auch zuerst einem Verstärker 15 zugeführt werden.In the event of a sudden rotation of the drilling device about the axis of the drilling spindle 5, a relative movement takes place between the mass 8 and the container 7 or the permanent magnet 9 due to the inertia. The mass 8 is rotated in the container 7 about the central longitudinal axis of the container 7. The mass 8 thus moves as a conductor through the magnetic field generated by the permanent magnet 9 and the yokes 10. A voltage is induced in the mass 8. This voltage can be tapped at the electrodes 10, 11 and used as a signal for triggering a specific function, such as, for example, switching off the energy supply, actuating a clutch or brake. For this purpose, the electrodes 11, 12 are connected to connecting lines 13, 14. Since the strength of the signal is relatively low, as shown in FIG. 2, the signal can also first be fed to an amplifier 15.

Claims (6)

1. Motorisch betriebenes Handgerät, das einem Werkzeug eine Drehbewegung erteilt, mit einem Gehäuse und einer darin in einer senkrecht zur Werkzeugachse verlaufenden Ebene beweglich gelagerten Masse, dadurch gekenn- zeichnet, dass die Masse (8) eine in einem verschlossenen, elektrisch nicht leitenden Behälter (7) angeordnete, elektrisch leitfähige Flüssigkeit ist und Mittel zum Abgreifen der bei einer Relativbewegung der Masse (8) in einem Magnetfeld entstehenden Induktion vorgesehen sind.1. Motor-operated hand-held device which gives a tool a rotary movement, with a housing and a mass movably mounted therein in a plane running perpendicular to the tool axis, characterized in that the mass (8) is in a closed, electrically non-conductive container (7) is arranged, electrically conductive liquid and means are provided for tapping off the induction resulting from a relative movement of the mass (8) in a magnetic field. 2. Gerät nach Anspruch 1, dadurch gekennzeichnet, dass die Masse (8) wenigstens teilweise vom Magnetfeld durchsetzt wird.2. Device according to claim 1, characterized in that the mass (8) is at least partially penetrated by the magnetic field. 3. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Permanentmagnet (9) zur Erzeugung des Magnetfeldes vorgesehen ist.3. Device according to claim 1 or 2, characterized in that a permanent magnet (9) is provided for generating the magnetic field. 4. Gerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Mittel zum Abgreifen der Induktion als mit der Flüssigkeit in elektrischer Verbindung stehenden Elektroden (11, 12) ausgebildet sind.4. Device according to one of claims 1 to 3, characterized in that the means for tapping the induction are designed as electrodes (11, 12) which are in electrical connection with the liquid. 5. Gerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Mittel zum Abgreifen der Induktion an einem Induktionselement angeordnet sind.5. Device according to one of claims 1 to 3, characterized in that the means for tapping the induction are arranged on an induction element. 6. Gerät nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Flüssigkeit Quecksilber ist.6. Device according to one of claims 1 to 5, characterized in that the liquid is mercury.
EP84810594A 1983-12-21 1984-12-05 Hand tool with movable inertia mass Expired EP0150669B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3346215 1983-12-21
DE19833346215 DE3346215A1 (en) 1983-12-21 1983-12-21 HAND TOOL WITH MOVABLE BEARING DIMENSIONS

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EP0150669A2 true EP0150669A2 (en) 1985-08-07
EP0150669A3 EP0150669A3 (en) 1987-01-07
EP0150669B1 EP0150669B1 (en) 1989-02-15

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US (1) US4638870A (en)
EP (1) EP0150669B1 (en)
DE (2) DE3346215A1 (en)

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EP0326783A2 (en) * 1988-01-30 1989-08-09 HILTI Aktiengesellschaft Motor-driven hand tool
EP0345655A2 (en) * 1988-06-04 1989-12-13 Robert Bosch Gmbh Safety circuit for an electric hand tool
WO1992018291A1 (en) * 1991-04-12 1992-10-29 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
DE4344817A1 (en) * 1993-12-28 1995-06-29 Hilti Ag Method and device for hand-held machine tools to avoid accidents due to tool blocking
EP0759343A1 (en) * 1995-08-17 1997-02-26 Milwaukee Electric Tool Corporation Hand held power tool including inertia switch
DE19857061A1 (en) * 1998-12-10 2000-06-15 Hilti Ag Method and device for avoiding accidents in hand-held machine tools due to tool blocking
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Cited By (19)

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Publication number Priority date Publication date Assignee Title
WO1988006508A2 (en) * 1987-03-05 1988-09-07 Robert Bosch Gmbh Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof
WO1988006508A3 (en) * 1987-03-05 1988-09-22 Bosch Gmbh Robert Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof
EP0326783A2 (en) * 1988-01-30 1989-08-09 HILTI Aktiengesellschaft Motor-driven hand tool
EP0326783A3 (en) * 1988-01-30 1990-10-10 Hilti Aktiengesellschaft Motor-driven hand tool
EP0345655A2 (en) * 1988-06-04 1989-12-13 Robert Bosch Gmbh Safety circuit for an electric hand tool
EP0345655A3 (en) * 1988-06-04 1992-03-04 Robert Bosch Gmbh Safety circuit for an electric hand tool
WO1992018291A1 (en) * 1991-04-12 1992-10-29 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
US5401124A (en) * 1991-04-12 1995-03-28 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
DE4344817A1 (en) * 1993-12-28 1995-06-29 Hilti Ag Method and device for hand-held machine tools to avoid accidents due to tool blocking
EP0666148A1 (en) 1993-12-28 1995-08-09 HILTI Aktiengesellschaft Method and apparatus for handheld machine tools to prevent accidents caused by blocking of the tool
EP0759343A1 (en) * 1995-08-17 1997-02-26 Milwaukee Electric Tool Corporation Hand held power tool including inertia switch
US5704435A (en) * 1995-08-17 1998-01-06 Milwaukee Electric Tool Corporation Hand held power tool including inertia switch
US5984020A (en) * 1995-08-17 1999-11-16 Milwaukee Electric Tool Corporation Power toll including inertia responsive element
DE19857061A1 (en) * 1998-12-10 2000-06-15 Hilti Ag Method and device for avoiding accidents in hand-held machine tools due to tool blocking
DE19857061C2 (en) * 1998-12-10 2000-11-02 Hilti Ag Method and device for avoiding accidents in hand-held machine tools due to tool blocking
DE10303006A1 (en) * 2003-01-27 2004-08-05 Hilti Ag Hand-held implement
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Also Published As

Publication number Publication date
EP0150669A3 (en) 1987-01-07
DE3346215A1 (en) 1985-07-11
US4638870A (en) 1987-01-27
DE3476743D1 (en) 1989-03-23
EP0150669B1 (en) 1989-02-15

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