EP2234776B1 - Electric hand tool with battery-based power supply - Google Patents

Electric hand tool with battery-based power supply Download PDF

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Publication number
EP2234776B1
EP2234776B1 EP08866883.5A EP08866883A EP2234776B1 EP 2234776 B1 EP2234776 B1 EP 2234776B1 EP 08866883 A EP08866883 A EP 08866883A EP 2234776 B1 EP2234776 B1 EP 2234776B1
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EP
European Patent Office
Prior art keywords
handle
rechargeable
battery cells
machine housing
battery
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EP08866883.5A
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German (de)
French (fr)
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EP2234776A1 (en
Inventor
Ulrich Bohne
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention relates to an electric hand tool with an accumulator-based power supply according to the preamble of the independent claims.
  • the bow-shaped handle has a handle zone with actuator for the commissioning of the associated electric hand tool, wherein the bow-shaped handle is designed in its entirety as a component change for operation on different tool modules.
  • the tool modules themselves do not have their own handle, but are prepared for receiving the bow-shaped handle.
  • the bow-shaped handle includes a coupling and locking mechanism for coupling the bow-shaped handle to a tool module.
  • the bow-shaped handle further one or two battery cells of a battery-based power supply are added, which supply the tool module with electrical energy.
  • the accumulator-based power supply according to US 3,952,239 but is limited in its performance due to the limited number of battery cells.
  • the electric hand tool according to the invention with the features of claim 1 has the advantage that the accumulator-based power supply can be easily designed according to the power requirement of the electric hand tool.
  • a further advantage is to be considered that the arrangement of the accumulator cells in the handle and auxiliary handle favors the handling of the electric hand tool.
  • an equal or larger number of accumulator cells are accommodated in the handle than in the additional handle.
  • At least four accumulator cells are provided.
  • the electric hand tool according to the invention is particularly balanced in its handling.
  • a particularly favorable design of an electric hand tool according to the invention is achieved by a successive arrangement of the battery cells in a first orientation plane in the handle.
  • the accumulator cells in the auxiliary handle are also arranged one behind the other lying in a second alignment plane in the auxiliary handle.
  • the first alignment plane and the second alignment plane are aligned under at least one non-zero angle W1, in particular at right angles to each other.
  • the first alignment plane is aligned parallel to a machine axis.
  • the machine axis is defined by a direction of insertion of an insert tool into a tool holder.
  • the tool holder is preferably arranged at a front end of the machine housing.
  • the accumulator cells which are accommodated in the handle and / or additional handle, are combined by at least one holding element to form a cell group.
  • the holding element is used in particular for fixing the accumulator cells in the handle and / or additional handle.
  • the handle and the auxiliary handle are integrally formed on the machine housing.
  • an intermediate segment is provided, which connects the handle and the auxiliary handle at their ends facing away from the machine housing.
  • the bow-shaped double handle can also act like a guard.
  • the intermediate segment and the additional handle form a front bar leg. This front Stirrup leg protects a hand of an operator on the handle behind the guard, especially with one-handed use of the electric hand tool.
  • the machine housing is constructed of at least two, in particular predominantly along the machine axis symmetrically designed housing shells.
  • a particular performance of the electric hand tool according to the invention is achieved by the execution of the battery cells as Li-ion battery cells.
  • the electric hand tool comprises in its machine housing a charging unit for charging the battery cells.
  • the charging unit is designed so that the battery cells is enabled via a wireless power transmission.
  • a wireless energy transfer in particular an optical and / or inductive energy transfer come into question.
  • the machine housing has a charging socket.
  • the charging socket is connected to a charger via a suitable connecting cable and the charging process is started.
  • the electric hand tool has a signal unit in its machine housing.
  • the signal unit indicates a current charge level of the battery cells.
  • the battery cells are interchangeable added. This allows in particular a simple and cost-effective execution of maintenance work on the battery-based power supply.
  • This can be the Handle and / or additional handle suitable for replacement, closable openings.
  • the battery cells may be housed in cell cases prepared for replacement. In this case, the machine housing for receiving the cell housing suitable slots.
  • Fig. 1 is a partial section through a side views of a hammer drill 10 shown as an example of an electric hand tool according to the invention.
  • the hammer drill 10 has a machine housing 12. On the machine housing 12, a bow-shaped two-hand grip 14 is arranged. This bow-shaped two-hand grip 14 comprises a handle 16 and an auxiliary handle 18. The handle 16 and the auxiliary handle 18 are connected via an intermediate segment 20. The intermediate segment 20 is in each case arranged on the end 24, 26 of the handle 16 and of the auxiliary handle 18 which faces away from a main segment 22 of the machine housing 12.
  • the handle 16 and auxiliary handle 18 are integrally formed on the machine housing 12.
  • the machine housing 12 is also constructed in the present example, together with the handle 16, the auxiliary handle 18 and the intermediate segment 20 of two housing shells, as best in Fig. 4a and 4b you can see.
  • the hammer drill 10 further includes a tool holder 28 for receiving an insert tool, not shown here.
  • the insert tool is inserted in the direction of the arrow A into the tool holder 28, which thus defines a machine axis 29.
  • the tool holder 28 is arranged on a front end side 30 of the machine housing 12.
  • the handle 16 has an actuating element 34 on its end face 32 directed toward the tool holder 28.
  • the actuating element 34 serves to start up the hammer drill 10 according to the invention.
  • first inner space 36 formed by the handle 16 two battery cells 38 are accommodated.
  • the accumulator cells 38 are arranged one behind the other lying in a first alignment plane E1 in the present embodiment.
  • the alignment plane E1 lies in the plane of the drawing Fig. 1 .
  • an electronic unit 40 is disposed in the interior 36 of the handle 16, which cooperates with the actuating element 34 for commissioning of the hammer drill.
  • a second internal space 42 which is formed by the auxiliary handle 18, two battery cells 38 a are accommodated.
  • the two accumulator cells 38a are arranged one behind the other in a second alignment plane E2, wherein the alignment plane E2 perpendicular to the plane of the drawing Fig. 1 is oriented so that only one battery cell 38a in Fig. 1 is visible.
  • This is in Fig. 1 represented by the arrow symbol for E2.
  • the two alignment planes E1 and E2 thus enclose an angle W1 of 90 °, ie they are aligned at right angles to each other.
  • the arrangement of the accumulator cells becomes clearer 38, 38a in the Fig. 3b .
  • the accumulator cells 38, 38a arranged in the bow-shaped two-hand grip 14 are shown by dashed lines.
  • the accumulator cells 38, 38a lying spatially behind the battery cells 38a, 38 shown in dashed lines are shown as a dotted line.
  • the accumulator cells 38, 38a are combined in the handle 16 and the auxiliary handle 18 by a respective holding element 39, 39a to each cell group and fixed in their arrangement.
  • the holding elements 39, 39a are designed as holding straps. However, it is possible to use clip elements, shaped elements or clips as holding elements 39, 39a.
  • the accumulator cells 38, 38a together form the accumulator-based power supply of the Fig. 1 not shown drive unit.
  • the in Fig. 1 illustrated hammer 10 requires according to its power requirements for its operation minimally a battery-based power supply with at least four battery cells 38, 38a. However, more battery cells 38, 38a may be necessary for the longest possible service life.
  • the maximum meaningful number of battery cells 38, 38a is limited on the one hand by a maximum space available in the machine housing 12, in particular in the bow-shaped two-hand grip 14.
  • the weight of the electric hand tool also increases unfavorably with each additional battery cell 38, 38a.
  • four accumulator cells 38, 38a are therefore provided in the proposed hammer drill 10 as an example of a hand tool according to the invention.
  • the number of battery cells 38, 38a may vary.
  • a charging socket 44 is arranged below the battery cells 38a in the auxiliary handle 18.
  • the charging socket 44 can be connected to a battery charger, not shown, for charging the battery cells 38, 38a via a suitable, not shown here connecting cable.
  • the handle 16 is equipped in its surface with elastic grip zones 46, as best in Fig. 2 you can see.
  • the operator actuates the actuating element 34. If the actuating element 34 is actuated, the drive unit is connected via the electronic unit 40 to the battery-based power supply, so that the insert tool used in the tool holder 28 is driven.
  • the auxiliary handle 18 forms together with the intermediate segment 20 a guard for the one hand of the operator.
  • the auxiliary handle 18 is equipped with elastic grip zones 46a, as it is in Fig. 2 is shown.
  • the grip zones 46, 46a are made of an elastomer.
  • the grip zones 46, 46a are embedded in the machine housing 12, in particular in the handle 16 and / or the auxiliary handle 18 of the bow-shaped two-hand grip 14, and preferably firmly connected thereto.
  • Fig. 2 Advantageous developments of the hammer drill 10 according to the invention are in Fig. 2 shown.
  • the accumulator cells 38, 38a can be made interchangeable. This is particularly advantageous for maintenance work on the battery cells 38, 38a.
  • Fig. 2 For this purpose, two different variants for interchangeability are shown.
  • At least one, closable with a closure element 48 opening is provided through which the accumulator cells 38, not shown here, can be removed from the machine housing 12.
  • the closure element 48 fits positively in the mounted state into a surface of the handle 16.
  • a locking element 50 the closure member 48 is connected to the handle 16, so that the battery cells 38 are protected against removal and / or falling out.
  • a further variant for the interchangeability of the battery cells 38, 38 a is shown.
  • a receiving opening 52 is provided in the auxiliary handle 18.
  • a battery unit 54 is inserted and secured with a locking device 56 against removal and / or falling out.
  • the accumulator unit 54 comprises an accumulator housing 58, in which the accumulator cells 38a, not shown here, are accommodated.
  • the accumulator unit 54 is designed as a plug-in unit.
  • such standardized accumulator units 54 can be used in an electric hand tool according to the invention, as they are known in particular from telecommunications and / or from consumer electronics.
  • Fig. 3a shows a view of a hammer drill 10 after Fig. 1 from above.
  • a signal unit 60 is arranged, which indicates a state of charge of the accumulator-based power supply, in particular the accumulator cells 38, 38a.
  • the signal unit 60 may include an LED and / or LCD display unit and / or an acoustic signal generator.
  • Fig. 3b is the off Fig. 1 known hammer drill 10 according to the invention shown in a view from below.
  • the charging socket 44 for charging the battery cells 38, 38a can be seen.
  • the charging socket 44 is arranged in the present example in the end remote from the main segment 22 of the machine housing 12 end 26 of the front stirrup leg 18.
  • the charging socket 44 may also be arranged at other suitable locations in the machine housing 12.
  • Fig. 3b With dashed lines are in Fig. 3b the battery cells 38, 38a accommodated in the bow-shaped two-hand grip 14 are shown.
  • the electric hand tool comprises a charging unit 62, not shown here, accommodated in the machine housing 12.
  • This charging unit 62 is designed to charge the battery cells 38, 38a by means of a wireless energy transmission.
  • energy may be transferred from an inductive power source to the charging unit 62.
  • An optical energy transmission, in particular by photovoltaic means, is also a suitable solution.
  • Fig. 4a is the off Fig. 1 known hammer drill shown in a view from the front. Dashed lines in this illustration indicate the accumulator cells 38a in the auxiliary handle, which are arranged in the alignment plane E2. As a result, they appear in Fig. 4a lying next to each other.
  • the arranged in the handle 16 accumulator cells 38 are in Fig. 4a indicated as dotted lines, since they are spatially behind the battery cells 38a.
  • Their orientation plane E1 stands perpendicular to the plane of the drawing Fig. 4a ,
  • Fig. 4b shows that off Fig. 1 known hammer drill in a view from behind.
  • the battery cells 38 are dashed lines and the spatially underlying battery cells 38 a dotted.
  • FIG. 4a and 4b shown machine housing 12 of the hammer drill has a butt weld 64 which limits the two housing shells 66.
  • the housing shells 66 are designed predominantly symmetrically along the machine axis 29. In this way, the machine housing 12 can be inexpensively manufactured together with the bow-shaped two-hand grip 14 as an injection molded part.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Elektrohandwerkzeug mit einer Akkumulator-basierten Energieversorgung nach der Gattung der unabhängigen Ansprüche.The invention relates to an electric hand tool with an accumulator-based power supply according to the preamble of the independent claims.

Es ist schon ein Elektrohandwerkzeug mit einer Akkumulator-basierten Energieversorgung bekannt. So ist unter anderem aus EP 1 312 448 A1 ein Bohrhammer mit einer Akkumulator-basierten Energieversorgung bekannt, an dessen Maschinengehäuse ein Handgriff und ein Zusatzhandgriff derart angeordnet ist, dass der Handgriff und der Zusatzhandgriff über ein Zwischensegment verbunden sind, welches zur axialen Aufnahme eines Akkumulatorgehäuses der Akkumulatoreinheit vorgesehen ist. Der Zusatzhandgriff bildet zusammen mit dem Akkumulatorgehäuse und dem Zwischensegment einen Schutzbügel. Ein Bohrhammer stellt auf Grund seines recht hohen Leistungsbedarfs große Anforderungen an die Leistungsfähigkeit, insbesondere die Ladekapazität, der Akkumulatoreinheit. Diese Anforderungen haben zur Folge, dass die Akkumulatoreinheit einen nicht unerheblichen Bauraum in Anspruch nimmt. Die Größe und geometrische Form des Schutzbügels sind dabei in Folge im Wesentlichen durch die Abmessungen des Akkumulatorgehäuses der Akkumulatoreinheit bestimmt.There is already an electric hand tool with an accumulator-based power supply known. So is out, among other things EP 1 312 448 A1 a hammer drill with an accumulator-based power supply known, on the machine housing, a handle and an additional handle is arranged such that the handle and the auxiliary handle are connected via an intermediate segment, which is provided for axially receiving a battery housing of the accumulator. The auxiliary handle forms together with the accumulator housing and the intermediate segment a guard. Due to its rather high power requirement, a rotary hammer places great demands on the performance, in particular the charging capacity, of the accumulator unit. These requirements have the consequence that the accumulator takes a considerable amount of space to complete. The size and geometric shape of the protective bow are determined in consequence essentially by the dimensions of the accumulator housing of the accumulator unit.

Weiterhin ist aus US 3,952,239 ein Elektrowerkzeug mit einem bügelförmiger Handgriff bekannt. Der bügelförmige Handgriff weist eine Handgriffzone mit Betätigungselement für die Inbetriebnahme des zugehörigen Elektrohandwerkzeugs, wobei der bügelförmige Handgriff in seiner Gesamtheit als Wechselkomponente für den Betrieb an verschiedenen Werkzeugmodulen ausgelegt ist. Die Werkzeugmodule verfügen dabei selbst über keinen eigenen Handgriff, sondern sind zur Aufnahme des bügelförmigen Handgriffs vorbereitet. Gemäß US 3,952,239 umfasst der bügelförmige Handgriff einen Kopplungs- und Verriegelungsmechanismus zur Kopplung des bügelförmigen Handgriffs an ein Werkzeugmodul. Im bügelförmigen Handgriff sind weiters ein oder zwei Akkumulatorzellen einer Akkumulator-basierten Energieversorgung aufgenommen, welche das Werkzeugmodul mit elektrischer Energie versorgen. Die Akkumulator-basierte Energieversorgung gemäß US 3,952,239 ist aber auf Grund der beschränkten Anzahl an Akkumulatorzellen in Ihrer Leistungsfähigkeit eingeschränkt.Furthermore, it is off US 3,952,239 a power tool with a bow-shaped handle known. The bow-shaped handle has a handle zone with actuator for the commissioning of the associated electric hand tool, wherein the bow-shaped handle is designed in its entirety as a component change for operation on different tool modules. The tool modules themselves do not have their own handle, but are prepared for receiving the bow-shaped handle. According to US 3,952,239 For example, the bow-shaped handle includes a coupling and locking mechanism for coupling the bow-shaped handle to a tool module. In the bow-shaped handle further one or two battery cells of a battery-based power supply are added, which supply the tool module with electrical energy. The accumulator-based power supply according to US 3,952,239 but is limited in its performance due to the limited number of battery cells.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Elektrohandwerkzeug mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Akkumulator-basierte Energieversorgung leicht gemäß dem Leistungsbedarf des Elektrohandwerkzeugs ausgelegt werden kann. Als weiteren Vorteil ist dabei anzusehen, dass die Anordnung der Akkumulatorzellen im Handgriff und Zusatzhandgriff die Handhabung des Elektrohandwerkzeugs begünstigt.The electric hand tool according to the invention with the features of claim 1 has the advantage that the accumulator-based power supply can be easily designed according to the power requirement of the electric hand tool. A further advantage is to be considered that the arrangement of the accumulator cells in the handle and auxiliary handle favors the handling of the electric hand tool.

Durch die in den Unteransprüchen aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale.The measures listed in the dependent claims, advantageous refinements and improvements of the main claim features.

In einer besonders leistungsfähigen Ausführung einer Akkumulator-basierte Energieversorgung eines erfindungsgemäßen Elektrohandwerkzeugs ist im Handgriff eine gleiche oder größere Anzahl von Akkumulatorzellen aufgenommen als im Zusatzhandgriff.In a particularly powerful embodiment of an accumulator-based power supply of an electric hand tool according to the invention, an equal or larger number of accumulator cells are accommodated in the handle than in the additional handle.

In einer besonders leichten und zugleich leistungsfähigen Ausführung eines erfindungsgemäßen Elektrohandwerkzeugs sind mindestens vier Akkumulatorzellen vorgesehen.In a particularly lightweight and at the same time powerful embodiment of an electric hand tool according to the invention, at least four accumulator cells are provided.

Sind im Handgriff und im Zusatzhandgriff jeweils die gleiche Anzahl von Akkumulatorzellen aufgenommen, so ist das erfindungsgemäße Elektrohandwerkzeug in seiner Handhabung besonders ausgewogen.If in each case the same number of accumulator cells are accommodated in the handle and in the auxiliary handle, then the electric hand tool according to the invention is particularly balanced in its handling.

Eine besonders günstige Bauform eines erfindungsgemäßen Elektrohandwerkzeugs wird durch die eine hintereinander liegende Anordnung der Akkumulatorzellen in einer ersten Ausrichtungsebene im Handgriff erzielt. Die Akkumulatorzellen im Zusatzhandgriff sind ebenfalls hintereinander liegend in einer zweiten Ausrichtungsebene im Zusatzhandgriff angeordnet. Für eine besonders günstige Griffhaltung des Handgriffs und des Zusatzhandgriffs sind die erste Ausrichtungsebene und die zweite Ausrichtungsebene unter mindestens einem von Null verschiedenen Winkel W1, insbesondere rechtwinklig zueinander ausgerichtet. In einer besonders bevorzugten Ausführung ist die erste Ausrichtungsebene parallel zu einer Maschinenachse ausgerichtet. Die Maschinenachse ist dabei durch eine Einsteckrichtung eines Einsatzwerkzeugs in einen Werkzeughalter definiert. Der Werkzeughalter ist vorzugsweise an einem stirnseitigen Ende des Maschinengehäuses angeordnet.A particularly favorable design of an electric hand tool according to the invention is achieved by a successive arrangement of the battery cells in a first orientation plane in the handle. The accumulator cells in the auxiliary handle are also arranged one behind the other lying in a second alignment plane in the auxiliary handle. For a particularly favorable grip position of the handle and the auxiliary handle, the first alignment plane and the second alignment plane are aligned under at least one non-zero angle W1, in particular at right angles to each other. In a particularly preferred embodiment, the first alignment plane is aligned parallel to a machine axis. The machine axis is defined by a direction of insertion of an insert tool into a tool holder. The tool holder is preferably arranged at a front end of the machine housing.

In einer besonders montagefreundlichen Ausführung eines erfindungsgemäßen Elektrohandwerkzeugs sind die Akkumulatorzellen, welche im Handgriff und/oder Zusatzhandgriff aufgenommen sind, durch mindestens ein Halteelement zu einer Zellengruppe zusammengefasst sind. Das Halteelement dient insbesondere der Fixierung der Akkumulatorzellen im Handgriff und/oder Zusatzhandgriff. In einer fertigungsgerechten und montagefreundlichen Ausführung eines erfindungsgemäßen Elektrohandwerkzeugs sind der Handgriff und der Zusatzhandgriff am Maschinengehäuse angeformt.In a particularly assembly-friendly design of an electric hand tool according to the invention, the accumulator cells, which are accommodated in the handle and / or additional handle, are combined by at least one holding element to form a cell group. The holding element is used in particular for fixing the accumulator cells in the handle and / or additional handle. In a production-friendly and easy-to-install embodiment of an electric hand tool according to the invention, the handle and the auxiliary handle are integrally formed on the machine housing.

In einer besonders bedienerfreundlichen Ausführung eines erfindungsgemäßen Elektrohandwerkzeugs ist ein Zwischensegment vorgesehen, welches den Handgriff und den Zusatzhandgriff an ihren vom Maschinengehäuse abgewandten Enden verbindet. Durch das Zwischensegment werden der Handgriff und der Zusatzhandgriff zu einem bügelförmiger Zweihandgriff für eine zweihändige Bedienung des Elektrohandwerkzeugs zusammengeführt. Der bügelförmige Doppelgriff kann aber auch wie ein Schutzbügel wirken. Dabei bilden das Zwischensegment und der Zusatzhandgriff einen vorderen Bügelschenkel. Dieser vordere Bügelschenkel schützt eine Hand eines Bedieners am hinter dem Schutzbügel liegenden Handgriff insbesondere bei einhändiger Benutzung des Elektrohandwerkzeugs.In a particularly user-friendly embodiment of an electric hand tool according to the invention, an intermediate segment is provided, which connects the handle and the auxiliary handle at their ends facing away from the machine housing. Through the intermediate segment of the handle and the auxiliary handle are combined to form a bow-shaped two-hand grip for a two-handed operation of the electric hand tool. The bow-shaped double handle can also act like a guard. The intermediate segment and the additional handle form a front bar leg. This front Stirrup leg protects a hand of an operator on the handle behind the guard, especially with one-handed use of the electric hand tool.

In einer besonders fertigungsgerechten und montagefreundlichen Ausführung eines erfindungsgemäßen Elektrohandwerkzeug ist das Maschinengehäuse aus mindestens zwei, insbesondere vorwiegend längs der Maschinenachse symmetrisch gestalteten Gehäuseschalen aufgebaut.In a particularly production-friendly and assembly-friendly design of an electric hand tool according to the invention, the machine housing is constructed of at least two, in particular predominantly along the machine axis symmetrically designed housing shells.

Eine besondere Leistungsfähigkeit des erfindungsgemäßen Elektrohandwerkzeugs wird durch die Ausführung der Akkumulatorzellen als Li-Ionen-Akkumulatorzellen erzielt.A particular performance of the electric hand tool according to the invention is achieved by the execution of the battery cells as Li-ion battery cells.

Eine leichte Handhabung des erfindungsgemäßen Elektrohandwerkzeugs wird dadurch erreicht, dass die Akkumulatorzellen zur Aufladung nicht aus dem Maschinengehäuse entfernt werden müssen.Easy handling of the electric hand tool according to the invention is achieved in that the battery cells for charging do not have to be removed from the machine housing.

Für eine besonders leichte Handhabung umfasst das erfindungsgemäße Elektrohandwerkzeug in seinem Maschinengehäuse eine Ladeeinheit zur Aufladung der Akkumulatorzellen. Die Ladeeinheit ist so ausgeführt, dass die Akkumulatorzellen über eine kabellose Energieübertragung ermöglicht wird. Als kabellose Energieübertragung kommen insbesondere eine optische und/oder induktive Energieübertragung in Frage.For a particularly easy handling, the electric hand tool according to the invention comprises in its machine housing a charging unit for charging the battery cells. The charging unit is designed so that the battery cells is enabled via a wireless power transmission. As a wireless energy transfer in particular an optical and / or inductive energy transfer come into question.

Bei einer kostengünstigen Ausführung eines erfindungsgemäßen Elektrohandwerkzeugs weist das Maschinengehäuse eine Ladebuchse auf. Über diese Ladebuchse kann die Aufladung der Akkumulatorzellen erfolgen. Dazu wird die Ladebuchse über ein entsprechendes Verbindungskabel mit einem Ladegerät verbunden und der Ladevorgang gestartet.In a cost-effective embodiment of an electric hand tool according to the invention, the machine housing has a charging socket. About this charging socket, the charging of the battery cells can be done. To do this, the charging socket is connected to a charger via a suitable connecting cable and the charging process is started.

Zur leichteren Handhabung weist das erfindungsgemäße Elektrohandwerkzeug eine Signaleinheit in seinem Maschinengehäuse auf. Die Signaleinheit zeigt dabei einen aktuellen Ladestand der Akkumulatorzellen an.For easier handling, the electric hand tool according to the invention has a signal unit in its machine housing. The signal unit indicates a current charge level of the battery cells.

Vorteilhafterweise sind die Akkumulatorzellen austauschbar aufgenommen. Dies ermöglicht insbesondere eine einfache und kostengünstige Ausführung von Wartungsarbeiten an der Akkumulator-basierten Energieversorgung. Dazu kann der Handgriff und/oder Zusatzhandgriff für den Austausch geeignete, verschließbare Öffnungen aufweisen. Auch können die Akkumulatorzellen in Zellengehäusen aufgenommen sein, die für den Austausch vorbereitet sind. In diesem Fall weist das Maschinengehäuse für die Aufnahme der Zellengehäuse geeignet Einschübe auf.Advantageously, the battery cells are interchangeable added. This allows in particular a simple and cost-effective execution of maintenance work on the battery-based power supply. This can be the Handle and / or additional handle suitable for replacement, closable openings. Also, the battery cells may be housed in cell cases prepared for replacement. In this case, the machine housing for receiving the cell housing suitable slots.

Beschreibung der ZeichnungenDescription of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der folgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
eine Seitenansicht eines Bohrhammers im Teilschnitt
Fig. 2
eine Seitenansicht eines Bohrhammers nach Fig. 1 mit zwei Varianten für austauschbare Akkumulatorzellen
Fig. 3a
eine Ansicht des Bohrhammers aus Fig. 1 von oben
Fig. 3b
eine Ansicht des Bohrhammers aus Fig. 1 von unten
Fig. 4a
eine Ansicht des Bohrhammers aus Fig. 1 von vorne
Fig. 4b
eine Ansicht des Bohrhammers aus Fig. 1 von hinten
Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:
Fig. 1
a side view of a hammer drill in partial section
Fig. 2
a side view of a hammer drill after Fig. 1 with two variants for exchangeable battery cells
Fig. 3a
a view of the hammer drill Fig. 1 from above
Fig. 3b
a view of the hammer drill Fig. 1 from underneath
Fig. 4a
a view of the hammer drill Fig. 1 from the front
Fig. 4b
a view of the hammer drill Fig. 1 from behind

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Fig. 1 ist ein Teilschnitt durch eine Seitenansichten eines Bohrhammers 10 als Beispiel einer erfindungsgemäßen Elektrohandwerkzeugs gezeigt. Der Bohrhammer 10 weist ein Maschinengehäuse 12 auf. An dem Maschinengehäuse 12 ist ein bügelförmigen Zweihandgriff 14 angeordnet. Dieser bügelförmige Zweihandgriff 14 umfasst einen Handgriff 16 und einen Zusatzhandgriff 18. Der Handgriff 16 und der Zusatzhandgriff 18 sind über ein Zwischensegment 20 verbunden. Das Zwischensegment 20 ist jeweils an dem, einem Hauptsegment 22 des Maschinengehäuses 12 abgewandten Ende 24, 26 des Handgriffs 16 und des Zusatzhandgriffs 18 angeordnet. In der gezeigten Ausführung des Bohrhammers 10 sind der Handgriff 16 und Zusatzhandgriff 18 am Maschinengehäuse 12 angeformt. Das Maschinengehäuse 12 ist im vorliegenden Beispiel darüber hinaus zusammen mit dem Handgriff 16, dem Zusatzhandgriff 18 und dem Zwischensegment 20 aus zwei Gehäuseschalen aufgebaut, wie es am besten in Fig. 4a und 4b zusehen ist.In Fig. 1 is a partial section through a side views of a hammer drill 10 shown as an example of an electric hand tool according to the invention. The hammer drill 10 has a machine housing 12. On the machine housing 12, a bow-shaped two-hand grip 14 is arranged. This bow-shaped two-hand grip 14 comprises a handle 16 and an auxiliary handle 18. The handle 16 and the auxiliary handle 18 are connected via an intermediate segment 20. The intermediate segment 20 is in each case arranged on the end 24, 26 of the handle 16 and of the auxiliary handle 18 which faces away from a main segment 22 of the machine housing 12. In the illustrated embodiment of the hammer drill 10, the handle 16 and auxiliary handle 18 are integrally formed on the machine housing 12. The machine housing 12 is also constructed in the present example, together with the handle 16, the auxiliary handle 18 and the intermediate segment 20 of two housing shells, as best in Fig. 4a and 4b you can see.

Der Bohrhammer 10 umfasst ferner einen Werkzeughalter 28 zur Aufnahme eines hier nicht gezeigten Einsatzwerkzeugs. Das Einsatzwerkzeug wird in Richtung des Pfeils A in dien Werkzeughalter 28 eingesetzt, welcher so eine Maschinenachse 29 definiert. Der Werkzeughalter 28 ist an einer vorderen Stirnseite 30 des Maschinengehäuses 12 angeordnet. Im Hauptsegment 22 des Maschinengehäuses 12 ist mindestens eine, hier nicht dargestellte Antriebseinheit zum Antrieb des im Werkzeughalter 28 aufgenommenen Einsatzwerkzeugs aufgenommen.The hammer drill 10 further includes a tool holder 28 for receiving an insert tool, not shown here. The insert tool is inserted in the direction of the arrow A into the tool holder 28, which thus defines a machine axis 29. The tool holder 28 is arranged on a front end side 30 of the machine housing 12. In the main segment 22 of the machine housing 12, at least one, not shown here drive unit for driving the recorded in the tool holder 28 insert tool is added.

Der Handgriff 16 weist an seiner zum Werkzeughalter 28 gerichteten Stirnseite 32 ein Betätigungselement 34 auf. Das Betätigungselement 34 dient der Inbetriebnahme des erfindungsgemäßen Bohrhammers 10.The handle 16 has an actuating element 34 on its end face 32 directed toward the tool holder 28. The actuating element 34 serves to start up the hammer drill 10 according to the invention.

In einem ersten Innenraum 36, der durch im Handgriff 16 gebildet ist, sind zwei Akkumulatorzellen 38 aufgenommen. Die Akkumulatorzellen 38 sind in der vorliegenden Ausführung hintereinander liegend in einer ersten Ausrichtungsebene E1 angeordnet. Dabei liegt die Ausrichtungsebene E1 in der Zeichnungsebene der Fig. 1. Über den Akkumulatorzellen 38 ist im Innenraum 36 des Handgriffs 16 eine Elektronikeinheit 40 angeordnet, welche mit dem Betätigungselement 34 zur Inbetriebnahme des Bohrhammers zusammenwirkt.In a first inner space 36 formed by the handle 16, two battery cells 38 are accommodated. The accumulator cells 38 are arranged one behind the other lying in a first alignment plane E1 in the present embodiment. In this case, the alignment plane E1 lies in the plane of the drawing Fig. 1 , About the accumulator cells 38, an electronic unit 40 is disposed in the interior 36 of the handle 16, which cooperates with the actuating element 34 for commissioning of the hammer drill.

In einem zweiten Innenraum 42, der durch im Zusatzhandgriff 18 gebildet ist, sind zwei Akkumulatorzellen 38a aufgenommen. Die zwei Akkumulatorzellen 38a sind in einer zweiten Ausrichtungsebene E2 hintereinander liegend angeordnet, wobei die Ausrichtungsebene E2 senkrecht zur Zeichnungsebene der Fig. 1 orientiert ist, so dass nur eine Akkumulatorzelle 38a in Fig. 1 sichtbar ist. Dies ist in Fig. 1 durch das Pfeilsymbol für E2 dargestellt. Die beiden Ausrichtungsebenen E1 und E2 schließen damit einen Winkel W1 von 90° ein, d.h. sie sind rechtwinklig zueinander ausgerichtet. Deutlicher wird die Anordnung der Akkumulatorzellen 38, 38a in den Fig. 3b, 4a und 4b. In diesen Abbildungen sind die im bügelförmigen Zweihandgriff 14 angeordneten Akkumulatorzellen 38, 38a durch gestrichelte Linien dargestellt. In den Fig. 4a und 4b sind die räumlich hinter den gestrichelt gezeigten Akkumulatorzellen 38a, 38 liegenden Akkumulatorzellen 38, 38a als punktierte Linie dargestellt.In a second internal space 42, which is formed by the auxiliary handle 18, two battery cells 38 a are accommodated. The two accumulator cells 38a are arranged one behind the other in a second alignment plane E2, wherein the alignment plane E2 perpendicular to the plane of the drawing Fig. 1 is oriented so that only one battery cell 38a in Fig. 1 is visible. This is in Fig. 1 represented by the arrow symbol for E2. The two alignment planes E1 and E2 thus enclose an angle W1 of 90 °, ie they are aligned at right angles to each other. The arrangement of the accumulator cells becomes clearer 38, 38a in the Fig. 3b . 4a and 4b , In these figures, the accumulator cells 38, 38a arranged in the bow-shaped two-hand grip 14 are shown by dashed lines. In the Fig. 4a and 4b the accumulator cells 38, 38a lying spatially behind the battery cells 38a, 38 shown in dashed lines are shown as a dotted line.

Die Akkumulatorzellen 38, 38a werden im Handgriff 16 und im Zusatzhandgriff 18 durch jeweils ein Halteelement 39, 39a zu jeweils einer Zellengruppe zusammengefasst und in ihrer Anordnung fixiert. Die Halteelemente 39, 39a sind dabei als Haltebänder ausgeführt. Es können jedoch Klammerelemente, Formelemente oder Klipse als Halteelemente 39, 39a verwendet werden.The accumulator cells 38, 38a are combined in the handle 16 and the auxiliary handle 18 by a respective holding element 39, 39a to each cell group and fixed in their arrangement. The holding elements 39, 39a are designed as holding straps. However, it is possible to use clip elements, shaped elements or clips as holding elements 39, 39a.

Die Akkumulatorzellen 38, 38a bilden zusammen die Akkumulator-basierte Energieversorgung der in Fig. 1 nicht dargestellten Antriebseinheit. Der in Fig. 1 dargestellte Bohrhammer 10 benötigt gemäß seinem Leistungsbedarf für seinen Betrieb minimal eine Akkumulator-basierte Energieversorgung mit mindestens vier Akkumulatorzellen 38, 38a. Für eine möglichst lange Betriebsdauer können jedoch mehr Akkumulatorzellen 38, 38a notwendig sein.The accumulator cells 38, 38a together form the accumulator-based power supply of the Fig. 1 not shown drive unit. The in Fig. 1 illustrated hammer 10 requires according to its power requirements for its operation minimally a battery-based power supply with at least four battery cells 38, 38a. However, more battery cells 38, 38a may be necessary for the longest possible service life.

Die maximal sinnvolle Anzahl von Akkumulatorzellen 38, 38a wird einerseits durch einen vorhanden Maximalbauraum im Maschinengehäuse 12, insbesondere im bügelförmigen Zweihandgriff 14 begrenzt. Andererseits nimmt mit jeder zusätzlichen Akkumulatorzelle 38, 38a auch das Gewicht des Elektrohandwerkzeugs ungünstig zu. Idealerweise sind daher im vorgeschlagenen Bohrhammer 10 als Beispiel einer erfindungsgemäßen Handwerkzeugmaschine vier Akkumulatorzellen 38, 38a vorgesehen. Abhängig von der konkreten Ausführung und den Leistungserfordernissen des erfindungsgemäßen Elektrohandwerkzeugs kann die Anzahl von Akkumulatorzellen 38, 38a jedoch variieren.The maximum meaningful number of battery cells 38, 38a is limited on the one hand by a maximum space available in the machine housing 12, in particular in the bow-shaped two-hand grip 14. On the other hand, the weight of the electric hand tool also increases unfavorably with each additional battery cell 38, 38a. Ideally, four accumulator cells 38, 38a are therefore provided in the proposed hammer drill 10 as an example of a hand tool according to the invention. Depending on the specific embodiment and the power requirements of the electric hand tool according to the invention, however, the number of battery cells 38, 38a may vary.

Zur Aufladung der Akkumulatorzellen 38, 38a ist unterhalb der Akkumulatorzellen 38a im Zusatzhandgriff 18 eine Ladebuchse 44 angeordnet. Die Ladebuchse 44 kann zur Aufladung der Akkumulatorzellen 38, 38a über ein geeignetes, hier nicht dargestelltes Verbindungskabel mit einem nicht gezeigten Ladegerät verbunden werden.For charging the battery cells 38, 38a, a charging socket 44 is arranged below the battery cells 38a in the auxiliary handle 18. The charging socket 44 can be connected to a battery charger, not shown, for charging the battery cells 38, 38a via a suitable, not shown here connecting cable.

Ein Bediener führt den Bohrhammer 10 bei einer einhändigen Benutzung mit einer Hand über den Handgriff 16, welcher als Haupthandgriff ausgeführt ist. Der Handgriff 16 ist dazu in seiner Oberfläche mit elastischen Griffzonen 46 ausgestattet, wie sie am besten in Fig. 2 zu sehen sind. Zur Inbetriebnahme des Bohrhammers 10 betätigt der Bediener das Betätigungselement 34. Wird des Betätigungselement 34 betätigt, wird die Antriebseinheit über die Elektronikeinheit 40 mit der Akkumulator-basierten Energieversorgung verbunden, so dass das im Werkzeughalter 28 eingesetzte Einsatzwerkzeug angetrieben wird. Der Zusatzhandgriff 18 bildet zusammen mit dem Zwischensegment 20 einen Schutzbügel für die eine Hand des Bedieners.An operator leads the hammer drill 10 with a one-handed use with one hand on the handle 16, which is designed as a main handle. The handle 16 is equipped in its surface with elastic grip zones 46, as best in Fig. 2 you can see. To operate the hammer drill 10, the operator actuates the actuating element 34. If the actuating element 34 is actuated, the drive unit is connected via the electronic unit 40 to the battery-based power supply, so that the insert tool used in the tool holder 28 is driven. The auxiliary handle 18 forms together with the intermediate segment 20 a guard for the one hand of the operator.

Insbesondere für Bohr- und/oder Meißelarbeiten ist es darüber hinaus nützlich, dass über den Zusatzhandgriff 18 eine zweihändige Bedienung möglich ist. Dazu ist auch der Zusatzhandgriff 18 mit elastischen Griffzonen 46a ausgestattet, wie es in Fig. 2 gezeigt ist.In particular, for drilling and / or chiselling, it is also useful that the auxiliary handle 18, a two-handed operation is possible. For this purpose, the additional handle 18 is equipped with elastic grip zones 46a, as it is in Fig. 2 is shown.

In einer bevorzugten Ausführungen sind die Griffzonen 46, 46a aus einem Elastomer gefertigt. In einer besonders bevorzugten Ausführung sind die Griffzonen 46, 46a in das Maschinengehäuse 12, insbesondere in den Handgriff 16 und/oder den Zusatzhandgriff 18 des bügelförmigen Zweihandgriffs 14 eingelassen und vorzugsweise fest mit diesem verbunden.In a preferred embodiment, the grip zones 46, 46a are made of an elastomer. In a particularly preferred embodiment, the grip zones 46, 46a are embedded in the machine housing 12, in particular in the handle 16 and / or the auxiliary handle 18 of the bow-shaped two-hand grip 14, and preferably firmly connected thereto.

Vorteilhafte Weiterentwicklungen des erfindungsgemäßen Bohrhammers 10 sind in Fig. 2 dargestellt. In einer bevorzugten Ausführung können die Akkumulatorzellen 38, 38a austauschbar ausgeführt sein. Dies ist insbesondere für Wartungsarbeiten an den Akkumulatorzellen 38, 38a vorteilhaft. In Fig. 2 sind dazu zwei unterschiedliche Varianten für eine Austauschbarkeit gezeigt.Advantageous developments of the hammer drill 10 according to the invention are in Fig. 2 shown. In a preferred embodiment, the accumulator cells 38, 38a can be made interchangeable. This is particularly advantageous for maintenance work on the battery cells 38, 38a. In Fig. 2 For this purpose, two different variants for interchangeability are shown.

Im Handgriff 16 ist mindestens eine, mit einem Verschlusselement 48 verschließbare Öffnung vorgesehen, durch welche die hier nicht gezeigten Akkumulatorzellen 38 aus dem Maschinengehäuse 12 entfernt werden können. Das Verschlusselement 48 fügt sich im montierten Zustand formschlüssig in eine Oberfläche des Handgriffs 16 ein. Durch ein Verriegelungselement 50 wird das Verschlusselement 48 mit dem Handgriff 16 verbunden, so dass die Akkumulatorzellen 38 gegen Entnahme und/oder Herausfallen geschützt sind.In the handle 16 at least one, closable with a closure element 48 opening is provided through which the accumulator cells 38, not shown here, can be removed from the machine housing 12. The closure element 48 fits positively in the mounted state into a surface of the handle 16. By a locking element 50, the closure member 48 is connected to the handle 16, so that the battery cells 38 are protected against removal and / or falling out.

Im Zusatzhandgriff 18 ist eine weitere Variante für die Austauschbarkeit der Akkumulatorzellen 38, 38a dargestellt. Dabei ist im Zusatzhandgriff 18 eine Aufnahmeöffnung 52 vorgesehen. In diese Aufnahmeöffnung 52 wird eine Akkumulatoreinheit 54 eingesetzt und mit einem Verriegelungsvorrichtung 56 gegen Entnahme und/oder Herausfallen gesichert. Die Akkumulatoreinheit 54 umfasst ein Akkumulatorgehäuse 58, in welchem die hier nicht dargestellten Akkumulatorzellen 38a aufgenommen sind. In der hier gezeigten Ausführung ist die Akkumulatoreinheit 54 als Einschubeinheit ausgeführt. Vorteilhafterweise können so standardisierte Akkumulatoreinheiten 54 in einem erfindungsgemäßen Elektrohandwerkzeug eingesetzt werden, wie sie insbesondere aus der Telekommunikation und/oder aus der Unterhaltungselektronik bekannt sind.In the additional handle 18, a further variant for the interchangeability of the battery cells 38, 38 a is shown. In this case, a receiving opening 52 is provided in the auxiliary handle 18. In this receiving opening 52, a battery unit 54 is inserted and secured with a locking device 56 against removal and / or falling out. The accumulator unit 54 comprises an accumulator housing 58, in which the accumulator cells 38a, not shown here, are accommodated. In the embodiment shown here, the accumulator unit 54 is designed as a plug-in unit. Advantageously, such standardized accumulator units 54 can be used in an electric hand tool according to the invention, as they are known in particular from telecommunications and / or from consumer electronics.

Die vorgeschlagenen Ausführungen für die Austauschbarkeit stellen dabei nur Beispiele, die durch den Fachmann in geeigneter Weise ergänzt werden können. Insbesondere kann einer erfindungsgemäßes Elektrohandwerkzeug Vorrichtungen für die Austauschbarkeit der Akkumulatorzellen 38, 38a nach der ersten und/oder zweiten Varianten aufweisen.The proposed embodiments for interchangeability represent only examples that can be supplemented by the skilled person in a suitable manner. In particular, an inventive electric hand tool devices for the interchangeability of the battery cells 38, 38a according to the first and / or second variants have.

Fig. 3a zeigt eine Ansicht eines Bohrhammers 10 nach Fig. 1 von oben. Im Maschinengehäuse 12 ist eine Signaleinheit 60 angeordnet, welche einen Ladezustand der Akkumulator-basierten Energieversorgung, insbesondere der Akkumulatorzellen 38, 38a anzeigt. Die Signaleinheit 60 kann dazu eine LED- und/oder LCD-Anzeigeeinheit und/oder ein akustischen Signalgeber umfassen. Fig. 3a shows a view of a hammer drill 10 after Fig. 1 from above. In the machine housing 12, a signal unit 60 is arranged, which indicates a state of charge of the accumulator-based power supply, in particular the accumulator cells 38, 38a. The signal unit 60 may include an LED and / or LCD display unit and / or an acoustic signal generator.

In Fig. 3b ist der aus Fig. 1 bekannte erfindungsgemäße Bohrhammer 10 in einer Ansicht von unten dargestellt. In dieser Ansicht ist insbesondere die Ladebuchse 44 zur Aufladung der Akkumulatorzellen 38, 38a zu sehen. Die Ladebuchse 44 ist im vorliegenden Beispiel im vom Hauptsegment 22 des Maschinengehäuses 12 abgewandten Ende 26 des vorderen Bügelschenkels 18 angeordnet. In Abwandlungen eines erfindungsgemäßen Elektrohandwerkzeugs kann die Ladebuchse 44 auch an anderen, geeigneten Stellen im Maschinengehäuse 12 angeordnet sein.In Fig. 3b is the off Fig. 1 known hammer drill 10 according to the invention shown in a view from below. In this view, in particular, the charging socket 44 for charging the battery cells 38, 38a can be seen. The charging socket 44 is arranged in the present example in the end remote from the main segment 22 of the machine housing 12 end 26 of the front stirrup leg 18. In modifications of an electric hand tool according to the invention, the charging socket 44 may also be arranged at other suitable locations in the machine housing 12.

Mit gestrichelten Linien sind in Fig. 3b die im bügelförmigen Zweihandgriff 14 aufgenommen Akkumulatorzellen 38, 38a gezeigt.With dashed lines are in Fig. 3b the battery cells 38, 38a accommodated in the bow-shaped two-hand grip 14 are shown.

In besonderen Weiterentwicklung umfasst das erfindungsgemäße Elektrohandwerkzeug eine hier nicht dargestellte, im Maschinengehäuse 12 aufgenommene Ladeeinheit 62. Diese Ladeeinheit 62 ist zur Aufladung der Akkumulatorzellen 38, 38a mittels einer kabellosen Energieübertragung ausgelegt. Insbesondere kann auf Basis einer induktiven Kopplung Energie von einer induktiven Energiequelle zur Ladeeinheit 62 übertragen werden. Auch stellt eine optische Energieübertragung, insbesondere auf photovoltaischem Weg eine geeignete Lösung dar.In a particular further development, the electric hand tool according to the invention comprises a charging unit 62, not shown here, accommodated in the machine housing 12. This charging unit 62 is designed to charge the battery cells 38, 38a by means of a wireless energy transmission. In particular, based on inductive coupling, energy may be transferred from an inductive power source to the charging unit 62. An optical energy transmission, in particular by photovoltaic means, is also a suitable solution.

In Fig. 4a ist der aus Fig. 1 bekannte Bohrhammer in einer Ansicht von vorne dargestellt. Mit gestrichelten Linien sind in dieser Darstellung die Akkumulatorzellen 38a im Zusatzhandgriff angedeutet, die in der Ausrichtungsebene E2 angeordnet sind. Dadurch erscheinen sie in Fig. 4a nebeneinander liegend. Die im Handgriff 16 angeordneten Akkumulatorzellen 38 sind in Fig. 4a als punktierte Linien angedeutet, da sie räumlich hinter den Akkumulatorzellen 38a liegen. Ihre Ausrichtungsebene E1 steht dabei senkrecht auf der Zeichnungsebene von Fig. 4a.In Fig. 4a is the off Fig. 1 known hammer drill shown in a view from the front. Dashed lines in this illustration indicate the accumulator cells 38a in the auxiliary handle, which are arranged in the alignment plane E2. As a result, they appear in Fig. 4a lying next to each other. The arranged in the handle 16 accumulator cells 38 are in Fig. 4a indicated as dotted lines, since they are spatially behind the battery cells 38a. Their orientation plane E1 stands perpendicular to the plane of the drawing Fig. 4a ,

Fig. 4b zeigt den aus Fig. 1 bekannten Bohrhammer in einer Ansicht von hinten. Bei dieser Darstellung sind die Akkumulatorzellen 38 gestrichelt und die räumlich dahinterliegenden Akkumulatorzellen 38a punktiert dar. Fig. 4b shows that off Fig. 1 known hammer drill in a view from behind. In this illustration, the battery cells 38 are dashed lines and the spatially underlying battery cells 38 a dotted.

Das in Fig. 4a und 4b dargestellte Maschinengehäuse 12 des Bohrhammers weist eine Stoßnaht 64 auf, welche die beiden Gehäuseschalen 66 begrenzt. Die Gehäuseschalen 66 sind dabei vorwiegend symmetrisch längs der Maschinenachse 29 ausgeführt. Auf diese Weise kann das Maschinengehäuse 12 kostengünstig zusammen mit dem bügelförmigen Zweihandgriff 14 als Spritzgussteil hergestellt werden.This in Fig. 4a and 4b shown machine housing 12 of the hammer drill has a butt weld 64 which limits the two housing shells 66. The housing shells 66 are designed predominantly symmetrically along the machine axis 29. In this way, the machine housing 12 can be inexpensively manufactured together with the bow-shaped two-hand grip 14 as an injection molded part.

Weitere Abwandlungen und Weiterentwicklungen des erfindungsgemäßen Elektrohandwerkzeugs sind durch Kombination der im Vorhergehenden geschilderten Merkmale und Eigenschaften zu erzielen.Further modifications and further developments of the electric hand tool according to the invention can be achieved by combining the features and properties described above.

Claims (12)

  1. Electric handtool, in particular a hammer drill and/or chisel hammer, having a rechargeable-battery-based power supply with at least one rechargeable-battery cell (38, 38a) and a machine housing (12), having a handle (16) and at least one additional handle (18), wherein the handle (16) and/or the additional handle (18) are/is used as a receptacle for the at least one rechargeable-battery cell (38, 38a), wherein a plurality of rechargeable-battery cells (38, 38a) are accommodated in the handle (16) and in the additional handle (18), the rechargeable-battery cells (38, 38a) need not be removed from the machine housing (12) for charging, and in particular need not be removed from the handle (16) and the additional handle (18) for charging, characterized in that the rechargeable-battery cells (38) in the handle (16) are arranged on a first alignment plane (E1) which is aligned at an angle W1, which in particular is a right angle, other than zero to a second alignment plane (E2), on which the rechargeable-battery cells (38a) in the additional handle (18) are arranged, wherein the rechargeable-battery cells (38, 38a) are lithium-ion rechargeable-battery cells.
  2. Electric handtool according to Claim 1, characterized in that the number of rechargeable-battery cells (38) accommodated in the handle (16) is the same as or greater than the number accommodated in the additional handle (18).
  3. Electric handtool according to Claim 1 or 2, characterized in that a total of at least three rechargeable-battery cells (38, 38a) are provided.
  4. Electric handtool according to one of Claims 1 to 3, characterized in that the same number of rechargeable-battery cells (38, 38a) are in each case accommodated in the handle (16) and in the additional handle (18).
  5. Electric handtool according to one of the preceding claims, characterized in that the rechargeable-battery cells (38, 38a) in the handle (16) and/or in the additional handle (18) are held together by a holding element (39, 39a) to form a cell group.
  6. Electric handtool according to one of the preceding claims, characterized in that the handle (16) and the additional handle (18) are integrally formed on the machine housing (12).
  7. Electric handtool according to one of the preceding claims, characterized in that an intermediate segment (20) is provided, which connects the handle (16) and the additional handle (18) at their ends (24, 26) remote from the machine housing (12), and thus forms a double handle (14) in the form of a bracket.
  8. Electric handtool according to one of the preceding claims, characterized in that the machine housing (14) is formed from at least two housing shells (66) which are designed symmetrically, in particular predominantly along the machine axis (29).
  9. Electric handtool according to one of the preceding claims, characterized in that a charging unit (62) is provided in the machine housing (12) and allows charging of the rechargeable-battery cells (38, 38a) by contactless power transmission, in particular optical and/or inductive power transmission.
  10. Electric handtool according to one of the preceding claims, characterized in that a charging socket (44) for charging the rechargeable-battery cells (38, 38a) is provided in the machine housing (12), in particular in the handle (16) or additional handle (18).
  11. Electric handtool according to one of the preceding claims, characterized in that a signal unit (60), which indicates a state of charge of the rechargeable-battery cells (38, 38a), is provided on the machine housing (12).
  12. Electric handtool according to one of the preceding claims, characterized in that the rechargeable-battery cells (38, 38a) are accommodated interchangeably.
EP08866883.5A 2008-01-02 2008-11-06 Electric hand tool with battery-based power supply Active EP2234776B1 (en)

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DE102008003111A DE102008003111A1 (en) 2008-01-02 2008-01-02 Electric hand tool with an accumulator-based power supply
PCT/EP2008/065074 WO2009083317A1 (en) 2008-01-02 2008-11-06 Electric hand tool with battery-based power supply

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EP2203277A1 (en) * 2007-10-10 2010-07-07 Robert Bosch GmbH Electric combined hand-held power tool

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Publication number Publication date
RU2010132276A (en) 2012-02-10
WO2009083317A1 (en) 2009-07-09
CN101909825A (en) 2010-12-08
EP2234776A1 (en) 2010-10-06
CN101909825B (en) 2015-08-26
RU2501647C2 (en) 2013-12-20
DE102008003111A1 (en) 2009-07-09

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