EP0206981A2 - Vibrations producing hand tool - Google Patents

Vibrations producing hand tool Download PDF

Info

Publication number
EP0206981A2
EP0206981A2 EP86810196A EP86810196A EP0206981A2 EP 0206981 A2 EP0206981 A2 EP 0206981A2 EP 86810196 A EP86810196 A EP 86810196A EP 86810196 A EP86810196 A EP 86810196A EP 0206981 A2 EP0206981 A2 EP 0206981A2
Authority
EP
European Patent Office
Prior art keywords
handle
electromagnet
housing
hand tool
force
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
EP86810196A
Other languages
German (de)
French (fr)
Other versions
EP0206981A3 (en
EP0206981B1 (en
Inventor
Karl Blaas
Hansjörg Nipp
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 EP0206981A2 publication Critical patent/EP0206981A2/en
Publication of EP0206981A3 publication Critical patent/EP0206981A3/en
Application granted granted Critical
Publication of EP0206981B1 publication Critical patent/EP0206981B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • 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
    • B25F5/006—Vibration damping means

Definitions

  • the invention relates to a rotary hammer, chisel hammer and the like.
  • vibration-generating drive device arranged in a housing and a handle connected to the housing parallel to the main axis of vibration between two stops to a limited extent.
  • Drill and / or chisel hammers with vibration-generating drive devices are mainly used in the construction industry for drilling and mining work.
  • the vibrations can be generated electromechanically, ie by means of an electric motor and a mechanical or electropneumatic hammer mechanism, pneumatically, hydraulically or electromagnetically and serve, for example, to act on a drilling or chiseling tool.
  • these vibrations are also transmitted to the operator in the known hand tools via the handles.
  • the resulting alternating stress on the joints and muscles can lead to health damage to the operator over time.
  • the operator has to apply a greater or lesser force to track the device. Due to the vibrations superimposed on this contact pressure, the operator becomes very tired after a short time.
  • the invention has for its object to provide a hammer drill and / or chisel with vibration generating drive device in which the transmission of vibrations from the housing to the handle is effectively prevented.
  • this is achieved in that the stop of the handle arranged in the feed direction is designed as an electromagnet with a force acting counter to the feed direction.
  • Electromagnets are very often used for the actuation of valves, electrical switches and the like and are therefore mass-produced economically in large series.
  • the force of the electromagnet is expediently constant within a partial area of the displacement path of the handle. Since vibrations of high frequency are very often involved, the displacement path of the housing that occurs within one vibration is relatively small and can be, for example, fractions of a millimeter.
  • the required contact pressure of the device depends on the working position of the device and on the type of work to be done with the hand tool.
  • the force of the electromagnet can advantageously be regulated as a function of the position of the handle.
  • a control circuit is required, which is controlled, for example, via a signal from a distance measuring system of the handle relative to the housing.
  • the distance between the handle and the housing can be large with a low contact force and small with a high contact force.
  • the electromagnet is expediently operated with a direct current that remains essentially constant. Since mains-dependent, electrically operated hand tools are usually operated using alternating current, a rectifier circuit known per se and a constant current circuit are required for this. For example, in the case of mains-independent devices operated by means of rechargeable batteries, the existing voltage of the batteries can also be used directly for the operation of the electromagnets.
  • Electromagnets with a laminated yoke are known per se. However, these are mostly operated using alternating current. The yoke is sheeted in order to avoid losses and heating of the iron parts as a result of the eddy currents caused by the alternating current.
  • Electromagnets with a laminated armature are also known per se and are mostly operated by means of alternating current. When the electromagnet is operated by means of direct current, however, the sheet metal of the armature and / or the yoke serves to avoid eddy currents occurring as a result of the dynamic movement.
  • the electromagnet In order to achieve the best possible vibration isolation, it is necessary for the electromagnet to have an approximately horizontal force / displacement characteristic, i.e. has a constant force independent of the path. This can be achieved, for example, by a corresponding geometry of the armature and the yoke. In order to avoid losses due to friction due to the armature touching the yoke and the like, the armature must be guided precisely in the yoke.
  • the hand tool essentially consists of a housing, generally designated 1, and a slidably connected handle, generally designated 2.
  • the housing 1 has a shoulder la on the handle side and the handle 2 has a corresponding guide bead 2a which interacts with the shoulder la.
  • the handle 2 can thus be moved with the housing 1 parallel to the main vibration axis to a limited extent connected.
  • the handle 2 is connected to the housing 1 by means of two hexagon screws 3 made of magnetically non-conductive material, which are screwed into the internal thread 1b of the housing 1.
  • the handle 2 has a supply line 4 and a switch 5 which serves to actuate the hand tool. In the handle 2, a total of 6 electromagnets are arranged.
  • the electromagnets 6 consist of a yoke 6a, an armature 6b which is displaceably guided relative to the yoke 6a and a magnet coil 6c surrounding the armature.
  • the yoke 6a is connected to the handle 2 via countersunk screws 7.
  • the armature 6b is connected to the housing 1 by means of the hexagon screws 3 and is clamped between the head of the hexagon screw 3 and the housing 1 by means of spacer sleeves 8, which are also magnetically non-conductive.
  • the electromagnets 6 are operated with a constant direct current.
  • a measuring probe 9 is arranged below the lower electromagnet 6. The measuring probe 9 measures the distance s between the housing 1 and the handle 2.
  • the signal which is produced in this case is passed to a regulator 10 which regulates the current intensity of the electrical current flowing through the magnetic coils 6c.
  • This regulation can take place, for example, in such a way that the distance s becomes smaller and the current in the magnet coils 6c increases as the contact force increases.
  • the current intensity of the current flowing through the magnetic coils 6c or the required contact pressure can, for example, also be set from the outside in accordance with the intended working position of the hand tool.
  • connection of the yoke 6a of the electromagnets 6 to the handle 2 and the armature 6b to the housing 1 is purely arbitrary and could just as well be reversed.
  • the division of the required magnetic force into two electromagnets 6 arranged parallel to one another is also not mandatory and was chosen in the construction shown only for reasons of space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Das Handwerkzeug mit einem Gehäuse (1) und darin angeordneter, Schwingungen erzeugender Antriebseinrichtung weist einen mit dem Gehäuse (1) parallel zur Hauptschwingungsachse zwischen zwei Anschlägen begrenzt verschiebbar verbundenen Handgriff (2) auf. Der in Vorschubrichtung des Handwerkzeuges angeordnete Anschlag des Handgriffes (2) ist als Elektromagnet (6) ausgebildet. Der aus einem Joch (6a), einem Anker (6b) sowie einer Magnetspule (6c) bestehende Elektromagnet (6) ist so ausgelegt, dass er praktisch unabhängig von der Stellung des Handgriffes (2) gegenüber dem Gehäuse (1) eine konstante, regelbare Kraft sowohl auf den Handgriff (2) als auch auf das Gehäuse (1) ausübt. Die Kraft des Elektromagneten (6) ist regelbar, so dass beispielsweise eine Anpassung an die von der Lage des Handwerkzeuges abhängigen Verhältnisse möglich ist.The hand tool with a housing (1) and a drive device which generates vibrations arranged therein has a handle (2) which is connected to the housing (1) parallel to the main vibration axis and can be displaced to a limited extent between two stops. The stop of the handle (2) arranged in the feed direction of the hand tool is designed as an electromagnet (6). The electromagnet (6), which consists of a yoke (6a), an armature (6b) and a magnetic coil (6c), is designed in such a way that it is practically independent of the position of the handle (2) relative to the housing (1) Applies force to both the handle (2) and the housing (1). The force of the electromagnet (6) can be regulated so that, for example, an adaptation to the conditions dependent on the position of the hand tool is possible.

Description

Die Erfindung betrifft einen Bohr-, Meisselhammer und dgl. mit Schwingungen erzeugender, in einem Gehäuse angeordneter Antriebseinrichtung und einem mit dem Gehäuse parallel zur Hauptschwingungsachse zwischen zwei Anschlägen begrenzt verschiebbar verbundenen Handgriff.The invention relates to a rotary hammer, chisel hammer and the like. With vibration-generating drive device arranged in a housing and a handle connected to the housing parallel to the main axis of vibration between two stops to a limited extent.

Bohr- und/oder Meisselhämmer mit Schwingungen erzeugender Antriebseinrichtung werden hauptsächlich im Baugewerbe für Bohr- und Abbauarbeiten eingesetzt. Die Schwingungen können elektromechanisch, dh mittels eines Elektromotors und eines mechanischen oder elektropneumatischen Schlagwerkes, pneumatisch, hydraulisch oder elektromagnetisch erzeugt werden und dienen beispielsweise der Beaufschlagung eines Bohr- oder Meisselwerkzeuges. Infolge der Reaktionskräfte werden diese Schwingungen bei den bekannten Handwerkzeugen über die Handgriffe auch auf die Bedienungsperson übertragen. Die sich im Betrieb ergebende Wechselbelastung der Gelenke und Muskeln kann bei der Bedienungsperson mit der Zeit zu gesundheitlichen Schäden führen. Je nach Art und Arbeitslage des Werkzeuges muss von der Bedienungsperson eine mehr oder weniger grosse Kraft zum Nachführen des Gerätes aufgebracht werden. Durch die dieser Anpresskraft überlagerten Schwingungen erfolgt zudem nach kurzer Zeit eine starke Ermüdung der Bedienungsperson.Drill and / or chisel hammers with vibration-generating drive devices are mainly used in the construction industry for drilling and mining work. The vibrations can be generated electromechanically, ie by means of an electric motor and a mechanical or electropneumatic hammer mechanism, pneumatically, hydraulically or electromagnetically and serve, for example, to act on a drilling or chiseling tool. As a result of the reaction forces, these vibrations are also transmitted to the operator in the known hand tools via the handles. The resulting alternating stress on the joints and muscles can lead to health damage to the operator over time. Depending on the type and working position of the tool, the operator has to apply a greater or lesser force to track the device. Due to the vibrations superimposed on this contact pressure, the operator becomes very tired after a short time.

Um die Uebertragung der Schwingungen vom Handwerkzeug auf die Bedienungsperson zu mindern, ist es bekannt, den Handgriff parallel zur Hauptschwingungsachse verschiebbar gegen die Kraft von Federelementen am Gehäuse abzustützen. Obwohl solche Federelemente zu einer gewissen Dämpfungswirkung führen, ist es bisher nicht gelungen, die Uebertragung der Schwingungen auf den Handgriff wirksam zu verhindern. Ein wesentlicher Nachteil dieser Federelemente besteht darin, dass sie eine bestimmte Eigenfrequenz aufweisen. Somit kann es beispielsweise bei sich im Betrieb ändernder Frequenz der Antriebseinrichtung zu Resonanzerscheinungen kommen.In order to reduce the transmission of vibrations from the hand tool to the operator, it is known to support the handle so that it can be displaced parallel to the main axis of vibration against the force of spring elements on the housing. Although such spring elements lead to a certain damping effect, it has so far not been possible to effectively prevent the transmission of the vibrations to the handle. A major disadvantage of these spring elements is that they have a certain natural frequency. Thus, resonance phenomena can occur, for example, when the frequency of the drive device changes during operation.

Der Erfindung liegt die Aufgabe zugrunde, einen Bohr- und/ oder Meisselhammer mit Schwingungen erzeugender Antriebseinrichtung zu schaffen, bei dem die Uebertragung der Schwingungen vom Gehäuse auf den Handgriff wirksam verhindert wird.The invention has for its object to provide a hammer drill and / or chisel with vibration generating drive device in which the transmission of vibrations from the housing to the handle is effectively prevented.

Gemäss der Erfindung wird dies dadurch erreicht, dass der in Vorschubrichtung angeordnete Anschlag des Handgriffes als Elektromagnet mit entgegen der Vorschubrichtung wirkender Kraft ausgebildet ist.According to the invention, this is achieved in that the stop of the handle arranged in the feed direction is designed as an electromagnet with a force acting counter to the feed direction.

Die Kraft eines Elektromagneten ist abhängig vom verketteten magnetischen Fluss und lässt sich somit über die Stromstärke des die Magnetspule durchfliessenden elektrischen Stromes in weiten Bereichen von aussen beeinflussen. Elektromagnete werden für die Betätigung von Ventilen, elektrischen Schaltern und dgl. sehr häufig verwendet und sind deshalb in grossen Serien wirtschaftlich herstellbare Massenprodukte.The force of an electromagnet is dependent on the interlinked magnetic flux and can thus be influenced from the outside over a wide range via the current strength of the electrical current flowing through the magnet coil. Electromagnets are very often used for the actuation of valves, electrical switches and the like and are therefore mass-produced economically in large series.

Um die Uebertragung der Schwingungen vom Gehäuse auf den Handgriff möglichst vollständig zu verhindern, ist zweckmässigerweise die Kraft des Elektromagneten innerhalb eines Teilbereiches des Verschiebeweges des Handgriffes konstant. Da es sich sehr oft um Schwingungen von hoher Frequenz handelt, ist der innerhalb einer Schwingung erfolgende Verschiebeweg des Gehäuses relativ klein und kann beispielsweise Bruchteile von Millimetern betragen.In order to prevent the transmission of the vibrations from the housing to the handle as completely as possible, the force of the electromagnet is expediently constant within a partial area of the displacement path of the handle. Since vibrations of high frequency are very often involved, the displacement path of the housing that occurs within one vibration is relatively small and can be, for example, fractions of a millimeter.

Wie erwähnt, ist die erforderliche Anpresskraft des Gerätes abhängig von der Arbeitslage des Gerätes und von der Art der mit dem Handwerkzeug zu verrichtenden Arbeit. Um für die jeweilige Arbeitsstellung eine definierte Lage des Handgriffes gegenüber dem Gehäuse zu erreichen, ist vorteilhafterweise die Kraft des Elektromagneten in Abhängigkeit von der Stellung des Handgriffes regelbar. Um dies zu ermöglichen, ist ein Regelkreis erforderlich, der beispielsweise über ein Signal eines Wegmesssystems des Handgriffes gegenüber dem Gehäuse gesteuert wird. So kann der Abstand zwischen dem Handgriff und dem Gehäuse beispielsweise bei geringer Anpresskraft gross und bei hoher Anpresskraft klein sein.As mentioned, the required contact pressure of the device depends on the working position of the device and on the type of work to be done with the hand tool. In order to achieve a defined position of the handle in relation to the housing for the respective working position, the force of the electromagnet can advantageously be regulated as a function of the position of the handle. In order to make this possible, a control circuit is required, which is controlled, for example, via a signal from a distance measuring system of the handle relative to the housing. For example, the distance between the handle and the housing can be large with a low contact force and small with a high contact force.

Um eine vom Weg unabhängige konstante Magnetkraft zu erreichen, wird zweckmässigerweise der Elektromagnet mit im wesentlichen konstant bleibendem Gleichstrom betrieben. Da vom Netz abhängige, elektrisch betriebene Handwerkzeuge meist mittels Wechselstrom betrieben werden, ist dafür eine an sich bekannte Gleichrichter-Schaltung sowie eine Konstantstrom-Schaltung erforderlich. Beispielsweise bei netzunabhängigen, mittels aufladbarer Batterien betriebenen Geräten kann die vorhandene Spannung der Batterien auch direkt für den Betrieb der Elektromagnete verwendet werden.In order to achieve a constant magnetic force independent of the path, the electromagnet is expediently operated with a direct current that remains essentially constant. Since mains-dependent, electrically operated hand tools are usually operated using alternating current, a rectifier circuit known per se and a constant current circuit are required for this. For example, in the case of mains-independent devices operated by means of rechargeable batteries, the existing voltage of the batteries can also be used directly for the operation of the electromagnets.

Bei dynamischer Bewegung des Ankers gegenüber dem Joch werden in den Eisenteilen des Magneten Wirbelströme induziert. Da diese Wirbelströme die Charakteristik und somit auch die Schwingungsisolation beeinträchtigen, müssen die Wirbelströme möglichst vermieden werden. Dies kann vorteilhafterweise dadurch erreicht werden, dass der Elektromagnet ein geblechtes Joch aufweist. Elektromagnete mit geblechtem Joch sind zwar an sich bekannt. Diese werden jedoch meist mittels Wechselstrom betrieben. Das Blechen des Joches erfolgt dabei, um Verluste und Erwärmungen der Eisenteile infolge der durch den Wechselstrom auftretenden Wirbelströme zu vermeiden.With dynamic movement of the armature relative to the yoke, eddy currents are induced in the iron parts of the magnet. Since these eddy currents impair the characteristic and thus also the vibration isolation, the eddy currents must be possible avoided as far as possible. This can advantageously be achieved in that the electromagnet has a laminated yoke. Electromagnets with a laminated yoke are known per se. However, these are mostly operated using alternating current. The yoke is sheeted in order to avoid losses and heating of the iron parts as a result of the eddy currents caused by the alternating current.

Eine weitere zweckmässige Möglichkeit, um Wirbelströme zu vermeiden, besteht darin, dass der Elektromagnet einen geblechten Anker aufweist. Elektromagnete mit geblechtem Anker sind an sich ebenfalls bekannt und werden meist mittels Wechselstrom betrieben. Beim Betrieb des Elektromagneten mittels Gleichstrom dient jedoch das Blechen des Ankers und/oder des Jochs dem Vermeiden von infolge der dynamischen Bewegung auftretenden Wirbelströme.Another useful way to avoid eddy currents is that the electromagnet has a laminated armature. Electromagnets with a laminated armature are also known per se and are mostly operated by means of alternating current. When the electromagnet is operated by means of direct current, however, the sheet metal of the armature and / or the yoke serves to avoid eddy currents occurring as a result of the dynamic movement.

Um eine möglichst gute Schwingungs-Isolation zu erreichen, ist es notwendig, dass der Elektromagnet eine annähernd horizontale Kraft/Weg-Kennlinie, d.h. eine vom Weg unabhängige, konstante Kraft aufweist. Dies kann beispielsweise durch eine entsprechende Geometrie des Ankers und des Jochs erreicht werden. Um Verluste durch Reibung infolge Berührens des Ankers mit dem Joch und dgl. zu vermeiden, ist eine genaue Führung des Ankers im Joch erforderlich.In order to achieve the best possible vibration isolation, it is necessary for the electromagnet to have an approximately horizontal force / displacement characteristic, i.e. has a constant force independent of the path. This can be achieved, for example, by a corresponding geometry of the armature and the yoke. In order to avoid losses due to friction due to the armature touching the yoke and the like, the armature must be guided precisely in the yoke.

Die Erfindung soll nachstehend anhand der sie beispielsweise wiedergebenden Zeichnung näher erläutert werden. Diese zeigt ein Handwerkzeug, teilweise im Schnitt dargestellt.The invention will be explained in more detail below with reference to the drawing, for example. This shows a hand tool, partially shown in section.

Das Handwerkzeug besteht im wesentlichen aus einem insgesamt mit 1 bezeichneten Gehäuse und einem damit verschiebbar verbundenen, insgesamt mit 2 bezeichneten Handgriff. Das Gehäuse 1 weist handgriffseitig einen Ansatz la und der Handgriff 2 einen entsprechenden, mit dem Ansatz la zusammenwirkenden Führungswulst 2a auf. Der Handgriff 2 ist somit mit dem Gehäuse 1 parallel zur Hauptschwingungsachse begrenzt verschiebbar verbunden. Die Verbindung des Handgriffes 2 mit dem Gehäuse 1 erfolgt über zwei Sechskantschrauben 3 aus magnetisch nicht leitendem Material, welche in Innengewinde 1b des Gehäuses 1 eingeschraubt sind. Der Handgriff 2 weist eine Zuleitung 4 sowie einen zur Betätigung des Handwerkzeuges dienenden Schalter 5 auf. Im Handgriff 2 sind zwei insgesamt mit 6 bezeichnete Elektromagnete angeordnet. Die Elektromagnete 6 bestehen aus einem Joch 6a, einem gegenüber dem Joch 6a verschiebbar geführten Anker 6b und einer den Anker umgebenden Magnetspule 6c. Das Joch 6a ist über Senkschrauben 7 mit dem Handgriff 2 verbunden. Der Anker 6b ist mittels der Sechskantschrauben 3 mit dem Gehäuse 1 verbunden und wird über ebenfalls magnetisch nicht leitende Distanzhülsen 8 zwischen dem Kopf der Sechskantschraube 3 und dem Gehäuse 1 eingespannt. Die Elektromagnete 6 werden mit im wesentlichen konstant bleibendem Gleichstrom betrieben. Unterhalb des unteren Elektromagneten 6 ist ein Messtaster 9 angeordnet. Der Messtaster 9 misst den Abstand s zwischen dem Gehäuse 1 und dem Handgriff 2. Das dabei entstehende Signal wird auf einen Regler 10 geleitet, der die Stromstärke des die Magnetspulen 6c durchfliessenden, elektrischen Stromes regelt. Diese Regelung kann beispielsweise so erfolgen, dass mit grösser werdender Anpresskraft der Abstand s kleiner und der Strom in den Magnetspulen 6c grösser wird. Innerhalb des durch die Schwingungen erzeugten Weges des Gehäuses 1 bleibt die Kraft der Elektromagnete 6 jedoch weitgehend konstant. Die Stromstärke des die Magnetspulen 6c durchfliessenden Stromes bzw. die erforderliche Anpresskraft kann beispielsweise auch von aussen entsprechend der vorgesehenen Arbeitslage des Handwerkzeuges eingestellt werden.The hand tool essentially consists of a housing, generally designated 1, and a slidably connected handle, generally designated 2. The housing 1 has a shoulder la on the handle side and the handle 2 has a corresponding guide bead 2a which interacts with the shoulder la. The handle 2 can thus be moved with the housing 1 parallel to the main vibration axis to a limited extent connected. The handle 2 is connected to the housing 1 by means of two hexagon screws 3 made of magnetically non-conductive material, which are screwed into the internal thread 1b of the housing 1. The handle 2 has a supply line 4 and a switch 5 which serves to actuate the hand tool. In the handle 2, a total of 6 electromagnets are arranged. The electromagnets 6 consist of a yoke 6a, an armature 6b which is displaceably guided relative to the yoke 6a and a magnet coil 6c surrounding the armature. The yoke 6a is connected to the handle 2 via countersunk screws 7. The armature 6b is connected to the housing 1 by means of the hexagon screws 3 and is clamped between the head of the hexagon screw 3 and the housing 1 by means of spacer sleeves 8, which are also magnetically non-conductive. The electromagnets 6 are operated with a constant direct current. A measuring probe 9 is arranged below the lower electromagnet 6. The measuring probe 9 measures the distance s between the housing 1 and the handle 2. The signal which is produced in this case is passed to a regulator 10 which regulates the current intensity of the electrical current flowing through the magnetic coils 6c. This regulation can take place, for example, in such a way that the distance s becomes smaller and the current in the magnet coils 6c increases as the contact force increases. However, within the path of the housing 1 generated by the vibrations, the force of the electromagnets 6 remains largely constant. The current intensity of the current flowing through the magnetic coils 6c or the required contact pressure can, for example, also be set from the outside in accordance with the intended working position of the hand tool.

Das Verbinden des Joches 6a der Elektromagnete 6 mit dem Handgriff 2 und des Ankers 6b mit dem Gehäuse 1 ist rein willkürlich und könnte ebensogut umgekehrt sein. Die Aufteilung der erforderlichen Magnetkraft auf zwei parallel zueinander angeordnete Elektromagnete 6 ist ebenfalls nicht zwingend und wurde in der dargestellten Konstruktion lediglich aus Platzgründen gewählt.The connection of the yoke 6a of the electromagnets 6 to the handle 2 and the armature 6b to the housing 1 is purely arbitrary and could just as well be reversed. The division of the required magnetic force into two electromagnets 6 arranged parallel to one another is also not mandatory and was chosen in the construction shown only for reasons of space.

Claims (6)

1. Bohr-, Meisselhammer und dgl. mit Schwingungen erzeugender, in einem Gehäuse angeordneter Antriebseinrichtung und einem mit dem Gehäuse parallel zur Hauptschwingungsachse zwischen zwei Anschlägen begrenzt verschiebbar verbundenen Handgriff, dadurch gekennzeichnet, dass der in Vorschubrichtung angeordnete Anschlag des Handgriffes (2) als Elektromagnet (6) mit entgegen der Vorschubrichtung wirkender Kraft ausgebildet ist.1. hammer drill, chisel hammer and the like. With vibration-generating, drive device arranged in a housing and a handle connected to the housing parallel to the main vibration axis between two stops to a limited extent, characterized in that the stop arranged in the feed direction of the handle (2) as an electromagnet (6) is designed with a force acting against the feed direction. 2. Handwerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass die Kraft des Elektromagneten (6) innerhalb eines Teilbereiches des gesamten Verschiebeweges des Handgriffes (2) konstant ist.2. Hand tool according to claim 1, characterized in that the force of the electromagnet (6) is constant within a partial range of the entire displacement path of the handle (2). 3. Handwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kraft des Elektromagneten (6) in Abhängigkeit von der Stellung (s) des Handgriffes (2) gegenüber dem Gehäuse (1) regelbar ist.3. Hand tool according to claim 1 or 2, characterized in that the force of the electromagnet (6) depending on the position (s) of the handle (2) relative to the housing (1) is adjustable. 4. Handwerkzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Elektromagnet (6) mit im wesentlichen konstant bleibendem Gleichstrom betrieben wird.4. Hand tool according to one of claims 1 to 3, characterized in that the electromagnet (6) is operated with a constant direct current. 5. Handwerkzeug nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Elektromagnet (6) ein geblechtes Joch (6a) aufweist.5. Hand tool according to one of claims 1 to 4, characterized in that the electromagnet (6) has a laminated yoke (6a). 6. Handwerkzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Elektromagnet (6) einen geblechten Anker (6b) aufweist.6. Hand tool according to one of claims 1 to 5, characterized in that the electromagnet (6) has a laminated armature (6b).
EP86810196A 1985-06-19 1986-04-30 Vibrations producing hand tool Expired - Lifetime EP0206981B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521808 1985-06-19
DE19853521808 DE3521808A1 (en) 1985-06-19 1985-06-19 VIBRATING HAND TOOL

Publications (3)

Publication Number Publication Date
EP0206981A2 true EP0206981A2 (en) 1986-12-30
EP0206981A3 EP0206981A3 (en) 1988-11-09
EP0206981B1 EP0206981B1 (en) 1991-02-27

Family

ID=6273567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810196A Expired - Lifetime EP0206981B1 (en) 1985-06-19 1986-04-30 Vibrations producing hand tool

Country Status (3)

Country Link
US (1) US4711308A (en)
EP (1) EP0206981B1 (en)
DE (2) DE3521808A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021014A1 (en) * 1996-11-12 1998-05-22 Wacker-Werke Gmbh & Co. Kg Working tool that can be guided in a grab handle
WO1998029220A1 (en) * 1997-01-02 1998-07-09 Wacker-Werke Gmbh & Co. Kg Percussion drill and/or jack hammer with handle spring-buffered against the hammer housing
DE10036078A1 (en) * 2000-07-25 2002-02-14 Bosch Gmbh Robert Drill or and chisel hammer has handle joined to housing, insulating arrangement with spring element of two spring supports, and pre-tension adjustment,
WO2002083369A1 (en) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Hand tool machine comprising a vibration-dampened handle
EP0916239B1 (en) * 1996-08-03 2002-12-11 Wacker Construction Equipment AG Electric tool with ducted cooled control electronics
DE10138123A1 (en) * 2001-08-03 2003-02-27 Bosch Gmbh Robert Power tool handle, e.g. for a hammer drill, has a parallel lever linkage for mounting at the tool housing together with a damper spring to dampen vibrations at the handle when using the tool
DE10158266A1 (en) * 2001-11-28 2003-06-26 Bosch Gmbh Robert Device for damping the vibration of a handle of a machine tool
US7076838B2 (en) 2001-07-24 2006-07-18 Robert Bosch Gmbh Hand-held machine tool with vibration-damped handle
DE102005031074A1 (en) * 2005-06-24 2007-01-04 C. & E. Fein Gmbh Powered hand tool with damping device
GB2451293A (en) * 2007-07-27 2009-01-28 Black & Decker Inc Hammer drill with slidably mounted handle
JP2009513366A (en) * 2003-07-15 2009-04-02 ワツカー コンストラクション イクイップメント アクチェンゲゼルシャフト Work machine with spring elastic damping hand grip

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839207A1 (en) * 1988-11-19 1990-05-23 Hilti Ag PORTABLE HAND DEVICE WITH STRIKE
JPH06507847A (en) * 1991-12-17 1994-09-08 インガーソル　ランド　カンパニー Device to reduce vibration transmission in hand tools
DE19503526A1 (en) * 1995-02-03 1996-08-08 Bosch Gmbh Robert Hammer drill and / or percussion hammer with removable vibration-damped handle and vibration-dampened handle arrangement for a rotary and / or percussion hammer
US6082468A (en) * 1998-04-20 2000-07-04 Snap-On Tools Company Interchangeable grips for power hand tools
WO2000047862A1 (en) * 1999-02-10 2000-08-17 Anglo Operations Limited Rock drill handle
US6308378B1 (en) 1999-06-01 2001-10-30 Porter-Cable Corporation Frictional gripping arrangement for a power tool handle
EP1200233A1 (en) * 1999-06-10 2002-05-02 MacDonald Air Tools Limited Pneumatic tool
US6161256A (en) * 1999-11-03 2000-12-19 Quiring; Herbert J. Drill handle cover
DE10005080C1 (en) * 2000-02-04 2001-08-02 Bosch Gmbh Robert Hand tool has handle with handle part fixed to casing by elastic, vibration-damping element and fixing part fixed at elastic element
DE10052447B4 (en) * 2000-10-23 2008-12-18 Hilti Aktiengesellschaft Beating electric hand tool with vibration reduction on the handle
DE10130088C2 (en) * 2001-06-21 2003-10-16 Hilti Ag Striking electric hand tool device with active vibration damping
DE10162633B4 (en) * 2001-12-20 2012-12-06 Hilti Aktiengesellschaft Stud gun
JP3680941B2 (en) * 2002-01-18 2005-08-10 マックス株式会社 Concrete drill
DE10204861B4 (en) * 2002-02-06 2004-01-29 Wacker Construction Equipment Ag Air spring hammer mechanism with electrodynamically driven drive piston
DE10255162A1 (en) * 2002-11-22 2004-06-03 Hilti Ag Vibration-decoupled hammer mechanism assembly
DE10254813A1 (en) * 2002-11-23 2004-06-03 Hilti Ag Electric hand machine tool with vibration-decoupled hammer mechanism assembly
GB2402098B (en) * 2003-05-21 2007-10-17 Black & Decker Inc Vibration reduction apparatus for power tool and power tool incorporating such apparatus
GB2407791A (en) * 2003-11-04 2005-05-11 Black & Decker Inc Vibration reduction apparatus for a power tool
GB2407790A (en) * 2003-11-04 2005-05-11 Black & Decker Inc Vibration reduction apparatus for a power tool
GB2407789A (en) * 2003-11-04 2005-05-11 Black & Decker Inc Vibration reduction apparatus for a power tool
DE102004001548A1 (en) * 2004-01-10 2005-08-04 Robert Bosch Gmbh Device with a vibration isolation device
DE102004019776A1 (en) * 2004-04-23 2005-11-17 Robert Bosch Gmbh Hand tool, in particular drill and / or percussion hammer
GB2414702A (en) * 2004-06-04 2005-12-07 Black & Decker Inc Vibration Reduction Apparatus for Power Tool
DE102004041219A1 (en) * 2004-08-26 2006-03-02 Robert Bosch Gmbh Hand machine tool grip device with a vibration shielding unit
DE102005046432A1 (en) * 2005-09-28 2007-03-29 Robert Bosch Gmbh Electrical machine tool e.g. grinding device, has grip unit, swivelably formed about swivel axis at pivotal point, including vibration damping device, where axis is arranged parallel to longitudinal extension of grip frame of grip unit
DE102005062883A1 (en) * 2005-12-29 2007-07-05 Robert Bosch Gmbh Power tool e.g. angle grinder has vibration reduction devices including auxiliary gauge that is connected by displacement unit, where vibration reduction devices are rigidly fastened at power tool
TWM296773U (en) * 2006-03-31 2006-09-01 Shuen Tai Prec Entpr Co Ltd Portable power drill with shock absorption protective sheath
DE102006027774A1 (en) * 2006-06-16 2007-12-20 Robert Bosch Gmbh Hand tool
ATE482031T1 (en) * 2006-07-01 2010-10-15 Black & Decker Inc DEMOLITION HAMMER
DE102006052807A1 (en) * 2006-11-09 2008-05-15 Robert Bosch Gmbh Hand tool with a vibration-damped strap handle
US8100745B2 (en) * 2007-03-16 2012-01-24 Black & Decker Inc. Low vibration sander with a flexible top handle
US7806201B2 (en) * 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
GB0804967D0 (en) * 2008-03-18 2008-04-16 Black & Decker Inc Powered hammer with a vibration dampening mechanism
DE102009014970A1 (en) * 2009-03-18 2010-09-23 C. & E. Fein Gmbh Oscillation tool with vibration damping
GB2472997A (en) * 2009-08-26 2011-03-02 Black & Decker Inc Hammer drill with vibration damping means in handle
US9849577B2 (en) * 2012-02-03 2017-12-26 Milwaukee Electric Tool Corporation Rotary hammer
US8966773B2 (en) 2012-07-06 2015-03-03 Techtronic Power Tools Technology Limited Power tool including an anti-vibration handle
EP2801448B1 (en) * 2013-05-06 2017-11-01 HILTI Aktiengesellschaft Manual tool machine
JP6070945B2 (en) * 2013-05-28 2017-02-01 日立工機株式会社 Portable work machine
JP7287981B2 (en) * 2018-05-29 2023-06-06 ローベル バーンバウマシーネン ゲゼルシャフト ミット ベシュレンクテル ハフツング Impact wrench for tightening and loosening track nuts and screws
US20220055198A1 (en) * 2020-08-24 2022-02-24 Makita Corporation Power tool having hammer mechanism
JP2022128006A (en) * 2021-02-22 2022-09-01 株式会社マキタ impact tool
JP1710821S (en) * 2021-08-05 2022-03-25 Portable electric hammer drill body

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498593A (en) *
GB1199417A (en) * 1966-08-12 1970-07-22 Binder Magnete A Lifting Magnet.
US4282938A (en) * 1978-03-25 1981-08-11 Yokosuka Boat Kabushiki Kaisha Vibration insulation device for handle of vibratory machine
DE3121882A1 (en) * 1980-07-18 1982-02-11 Hitachi Koki Co., Ltd., Tokyo Vibration tool with a vibration-resistant securing mechanism for the handle
DE3122979A1 (en) * 1981-06-10 1983-01-05 Hilti AG, 9494 Schaan DRILLING OR CHISEL HAMMER

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824417A (en) * 1973-03-19 1974-07-16 Black & Decker Mfg Co Handle mounting construction for electric paving breaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498593A (en) *
GB1199417A (en) * 1966-08-12 1970-07-22 Binder Magnete A Lifting Magnet.
US4282938A (en) * 1978-03-25 1981-08-11 Yokosuka Boat Kabushiki Kaisha Vibration insulation device for handle of vibratory machine
DE3121882A1 (en) * 1980-07-18 1982-02-11 Hitachi Koki Co., Ltd., Tokyo Vibration tool with a vibration-resistant securing mechanism for the handle
DE3122979A1 (en) * 1981-06-10 1983-01-05 Hilti AG, 9494 Schaan DRILLING OR CHISEL HAMMER

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916239B1 (en) * 1996-08-03 2002-12-11 Wacker Construction Equipment AG Electric tool with ducted cooled control electronics
DE19646622B4 (en) * 1996-11-12 2004-07-01 Wacker Construction Equipment Ag Tool that can be carried in one movement
US6076616A (en) * 1996-11-12 2000-06-20 Wacker-Werke Gmbh & Co. Kg Working tool which can be guided in a grab handle
WO1998021014A1 (en) * 1996-11-12 1998-05-22 Wacker-Werke Gmbh & Co. Kg Working tool that can be guided in a grab handle
WO1998029220A1 (en) * 1997-01-02 1998-07-09 Wacker-Werke Gmbh & Co. Kg Percussion drill and/or jack hammer with handle spring-buffered against the hammer housing
US6148930A (en) * 1997-01-02 2000-11-21 Wacker-Werke Gmbh & Co. Kg Percussion drill and/or jack hammer with handle spring-buffered against the hammer housing
DE10036078A1 (en) * 2000-07-25 2002-02-14 Bosch Gmbh Robert Drill or and chisel hammer has handle joined to housing, insulating arrangement with spring element of two spring supports, and pre-tension adjustment,
DE10036078B4 (en) * 2000-07-25 2007-04-05 Robert Bosch Gmbh Hand tool machine with a handle and an insulating device
US7100706B2 (en) 2001-04-11 2006-09-05 Robert Bosch Gmbh Hand tool machine comprising a vibration-dampened handle
WO2002083369A1 (en) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Hand tool machine comprising a vibration-dampened handle
US7076838B2 (en) 2001-07-24 2006-07-18 Robert Bosch Gmbh Hand-held machine tool with vibration-damped handle
EP2216141A1 (en) 2001-07-24 2010-08-11 Robert Bosch GmbH Hand-held machine tool with vibration-damping handle
DE10138123A1 (en) * 2001-08-03 2003-02-27 Bosch Gmbh Robert Power tool handle, e.g. for a hammer drill, has a parallel lever linkage for mounting at the tool housing together with a damper spring to dampen vibrations at the handle when using the tool
DE10158266B4 (en) * 2001-11-28 2004-01-15 Robert Bosch Gmbh Device for damping the vibration of a handle of a machine tool
DE10158266A1 (en) * 2001-11-28 2003-06-26 Bosch Gmbh Robert Device for damping the vibration of a handle of a machine tool
JP2009513366A (en) * 2003-07-15 2009-04-02 ワツカー コンストラクション イクイップメント アクチェンゲゼルシャフト Work machine with spring elastic damping hand grip
DE102005031074A1 (en) * 2005-06-24 2007-01-04 C. & E. Fein Gmbh Powered hand tool with damping device
GB2451293A (en) * 2007-07-27 2009-01-28 Black & Decker Inc Hammer drill with slidably mounted handle

Also Published As

Publication number Publication date
US4711308A (en) 1987-12-08
EP0206981A3 (en) 1988-11-09
DE3677644D1 (en) 1991-04-04
EP0206981B1 (en) 1991-02-27
DE3521808A1 (en) 1987-01-02

Similar Documents

Publication Publication Date Title
EP0206981B1 (en) Vibrations producing hand tool
DE3125860C2 (en) Electrically operated hand tool
EP0890397B1 (en) Apparatus and method of mechanical joining from sheet metal plates, profiles or multiple-sheet metal connections
DE102006033004A1 (en) Working, smoothing and cold-hardening of the surface of tools, machine parts or other parts comprises hammering the surface with an electromagnetically controlled hammer head
DE1904880B2 (en) Electromagnetic actuator
DE69522951T2 (en) BOLT WELDING DEVICE
DE10218929B4 (en) EDM machine
WO2006013170A1 (en) Device for decoupling an attachment from a moving machine element
DE202018102669U1 (en) Magnetic lifter for a milling machine
EP1221359B1 (en) Vibration isolating device
AT520796B1 (en) Darning unit for tamping sleepers on a track
EP1059646A1 (en) Actuator for electromagnetic valve drive
DE548390C (en) Electromagnet with iron housing with a core and several anchors (main and auxiliary armature), which are attracted one after the other until they touch each other when the winding is excited; when the winding is not excited, they are held from each other and by the core by impacts at certain intervals
DE102004001548A1 (en) Device with a vibration isolation device
DE102007031185B4 (en) Process for the pretreatment of metallic workpieces for drilling
DE19751504A1 (en) Hydraulic control for bending machine
EP3511104B1 (en) Welding device for welding bolts to a workpiece
DE102019211287B4 (en) Attachment spindle device for use on a machine tool, system with machine tool and attachment spindle device and method for controlling a drilling process carried out with an attachment spindle device, as well as a computer program product
DE19956155A1 (en) Machine tool with an electromagnet for attachment to a ferromagnetic workpiece
DE19748649C2 (en) Device for lubricating moving components
DE29780416U1 (en) Tool drive
DE890594C (en) Electromagnetic impact device
DE8910642U1 (en) Bolt welding device
DE914591C (en) Fault-controlled follower controller, especially for copying machine tools
DE911989C (en) Resistance regulator

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE FR GB LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB LI

17P Request for examination filed

Effective date: 19881203

17Q First examination report despatched

Effective date: 19900119

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19910227

REF Corresponds to:

Ref document number: 3677644

Country of ref document: DE

Date of ref document: 19910404

ET Fr: translation filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950330

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960327

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961227

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980101

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20000427

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010529

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010529

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL