EP3613105B1 - Spring contacts for a battery - Google Patents

Spring contacts for a battery Download PDF

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Publication number
EP3613105B1
EP3613105B1 EP18727145.7A EP18727145A EP3613105B1 EP 3613105 B1 EP3613105 B1 EP 3613105B1 EP 18727145 A EP18727145 A EP 18727145A EP 3613105 B1 EP3613105 B1 EP 3613105B1
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EP
European Patent Office
Prior art keywords
contact
contact element
machine tool
receiving
designed
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.)
Active
Application number
EP18727145.7A
Other languages
German (de)
French (fr)
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EP3613105A1 (en
Inventor
Ralf Meixner
Johannes Stempfhuber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
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Hilti AG
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Publication of EP3613105A1 publication Critical patent/EP3613105A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
    • H01R13/631—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only
    • H01R13/6315—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only allowing relative movement between coupling parts, e.g. floating connection
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • H01R13/112—Resilient sockets forked sockets having two legs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/15—Pins, blades or sockets having separate spring member for producing or increasing contact pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/66—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with pins, blades or analogous contacts and secured to apparatus or structure, e.g. to a wall
    • H01R24/68—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with pins, blades or analogous contacts and secured to apparatus or structure, e.g. to a wall mounted on directly pluggable apparatus

Definitions

  • the present invention relates to a machine tool containing a receiving device with at least one receiving element and an energy supply unit that can be connected to the machine tool, for example an accumulator, with a connection device, the connection device containing at least one contact element, the receiving device being designed to receive and hold the connection device , So that the at least one receiving element and the at least one contact element for establishing an electrical connection can be connected to one another.
  • Cordless machine tools can be operated with an accumulator for power supply.
  • the accumulator can be removed from the machine tool so that it can be recharged with electricity in a charging device.
  • the electric current is transmitted from the accumulator to the machine tool by means of electrical contact partners.
  • the contact partners each consist of a first and second contact element that can be connected to one another.
  • the first electrical contact element is arranged on the accumulator and the second contact element is arranged on the machine tool.
  • the second contact element is usually pushed into the first contact element.
  • the second contact element can also be referred to as a receiving element, since it is suitable, among other things, for receiving electrical current for the machine tool.
  • a high mechanical load in the form of acceleration forces can act on the electrical contact elements due to application-related vibrations or oscillations.
  • EP 1 036 636 A1 discloses an electric machine tool with a receiving device for a battery pack and a connector (contact element), with springs and movable elements in a guide bore of the battery assembly (or on the battery pack) are arranged so that vibrations that act on the drill, or from which can be caused by the drill itself, do not cause any relative movement between the battery assembly and the housing.
  • a machine tool containing a receiving device with at least one receiving element and an energy supply unit that can be connected to the machine tool, for example a rechargeable battery, with a connection device, the connection device containing at least one contact element, the receiving device being designed to receive the connection device and to hold, so that the at least one receiving element and the at least one contact element for establishing an electrical connection are connected to each other.
  • a damping element is provided on the at least one contact element, as a result of which the at least one contact element can be moved in a first direction and a second direction and relative to the respective receiving element, so that a relative movement between the contact element and the respective receiving element can be counteracted if the contact element and receiving element are connected to one another.
  • the damping element is designed as a spring and is positioned behind the contact element in the first direction, so that a spring force exerted by the damping element designed as a spring presses the contact element in the second direction. In this way, in particular, the greatest freedom of movement of the contact element relative to the receiving element can be effectively counteracted.
  • the damping element is also possible for the damping element to be designed as a component with an elastically deformable material.
  • An elastomer or any other suitable dimensionally stable but elastically deformable plastic is possible as the material.
  • the machine tool 1 is designed in the form of a drill. However, it is also possible for the machine tool 1 to be a hammer drill, a circular saw or the like.
  • the machine tool 1 shown essentially contains a housing 2, a tool holder 3, a handle 4 with an activation switch 5.
  • the machine tool 1 also contains a receiving device 6 for a power supply unit 7.
  • the energy supply unit 7 is designed as an accumulator, also called an accumulator.
  • the power supply unit 7 can also be designed as a connection unit with a power cable for connection to a power grid.
  • FIG 1 a state is shown in which the energy supply unit 7 configured as a rechargeable battery is connected to the machine tool 1 .
  • the rechargeable battery 7 is pushed onto the receiving device 6 in the direction of the arrow B.
  • the rechargeable battery 7 can be removed again from the receiving device 6 and thus from the machine tool 1 in accordance with the direction of the arrow A (and counter to the direction of the arrow B).
  • the power supply unit 7 is held on the machine tool 1 with a locking device that is not shown.
  • the housing 2 has a first end 2a and a second end 2b.
  • the tool holder 3 is positioned at a first end 2a of the housing 2 .
  • the tool holder 3 is used to record and releasably hold a tool 8.
  • the in the figures 1 and 2 Tool 8 shown is designed in the form of a drill.
  • the handle 4 includes the activation switch 5, a first end 4a and a second end 4b.
  • the activation switch 5 is used to actuate the machine tool 1.
  • the first end 4a of the handle 4 is attached.
  • the receiving device 6 for the energy supply unit 7 Positioned on the second end 4b of the handle 4 is the receiving device 6 for the energy supply unit 7 designed as a rechargeable battery.
  • the receiving device 6 includes a first receiving element 6a and a second receiving element 6b.
  • more than two receiving elements can also be provided. It is possible for a receiving element to contain both a positive pole and a negative pole for the electrical power supply.
  • Both the first and second receiving element 6a, 6b is designed in the form of a contact plate. Alternatively, the first and second receiving element 6a, 6b can also be configured as a cylinder.
  • the energy supply unit 7 designed as a rechargeable battery essentially contains a housing 9 in which a number of individual interconnected energy storage cells, also called rechargeable battery cells, are positioned. Electrical energy can be stored in the rechargeable battery 7 with the aid of the rechargeable battery cells.
  • the battery cells are not shown in the figures.
  • a connection device 9a with a first contact element 10a and a second contact element 10b is positioned at an upper end of the housing 9 .
  • the connecting device 9a serves to connect to the receiving device 6.
  • the connecting device 9a is pushed into the receiving device 6 and held by it.
  • more than two contact elements can also be provided. It is possible that a contact element contains both a positive pole and a negative pole for electrical power supply.
  • the first contact element 10a serves for the detachable connection to the first receiving element 6a and the second contact element 10b serves for the detachable connection to the second receiving element 6b (cf. 3 and 4 ).
  • the electrical energy stored in the battery cells can be conducted from the battery 7 into the receiving device 6.
  • the electrical energy is then passed on to electrical consumers in the machine tool 1 .
  • the connection unit also contains a first contact element 10a and a second contact element 10b for the respective connection and establishment of an electrical connection with the first and second receiving element 6a, 6b of the receiving device 6.
  • An electric motor for generating a torque is positioned in the housing 2 of the machine tool 1 .
  • the electric motor is thus an electrical consumer of electrical energy.
  • the torque generated in the electric motor is transmitted to the tool holder 3 via an output shaft and a gear. With the help of transmitted torque, the tool 8 is rotated. Neither the electric motor, the output shaft nor the gearing is shown in the figures.
  • the first contact element 10a contains a first contact plug 11a, a first stranded wire 12a and a first damping element 13a.
  • the second contact element 10b contains a second contact plug 11b, a second stranded wire 12b and a second damping element 13b.
  • the first contact plug 10a includes a first end 14a and a second end 15a.
  • the second contact plug 11b includes a first end 14b and a second end 15b.
  • the first strand 12a is connected to the second end 15a of the first contact plug 10a and the second strand 12b is connected to the second end 15b of the second contact plug 10b.
  • the strands 12a, 12b are designed to be flexible and allow the contact plugs 11a, 11b to move in the A and B directions. Furthermore, the strands 12a, 12b serve to transmit the electrical energy from the battery cells to the respective contact element 10a, 10b.
  • first contact element 10a is located in a first contact chamber 16a and the second contact element 10b is located in a second contact chamber 16b.
  • the two contact chambers 16a, 16b are essentially designed as bulges for the respective contact elements 10a, 10b and are positioned next to one another at an upper end 17 of the battery housing 9.
  • Each contact chamber 16a, 16b designed as a bulge thus has an opening 18a, 18b through which the contact plugs 11a, 11b in the contact chamber 16a, 16b are accessible.
  • the two contact plugs 11a, 11b are arranged in the respective contact chambers 16a, 16b in such a way that the first end 14a, 14b of the respective contact plug 11a, 11b faces the opening 18a, 18b of the contact chamber 16a, 16b.
  • first contact plug 11a contains a first contact sheet 19a and second contact sheet 19b
  • second contact plug 11b contains a first contact sheet 20a and second contact sheet 20b.
  • the contact sheets 19a, 19b, 20a, 20b are designed to be movable or flexible, so that the first contact sheet 19a, 20a can be pivoted reversibly or elastically in the direction of arrow C and the second contact sheet 19b, 20b in the direction of arrow D.
  • the mobility of the contact sheets 19a, 19b, 20a, 20b serves to accommodate the receiving elements 6a, 6b designed as contact sheets, so that each contact sheet is in contact with the first and second contact sheets 19a, 19b, 20a, 20b when the battery 7 is properly is connected to the machine tool 1 (cf. 4 ).
  • the first and second damping element 13a, 13b are designed as springs.
  • the spring 13a has a first end 21a and a second end 22a and the spring 13b has a first end 21b and a second end 22b.
  • Each damping element 13a, 13b designed as a spring is arranged in the respective contact chamber 16a, 16b and in relation to the respective contact plug 11a, 11b such that the first end 21a, 21b of the spring 13a, 13b is at the second end 15a, 15b of the respective contact plug 11a, 11b.
  • the second end 22a, 22b of each spring 13a, 13b bears against a rear wall 23, 24 of each contact cavity 16a, 16b.
  • each spring 13a, 13b thus presses the respective contact plug 11a, 11b in the direction of arrow A.
  • the length and nature of the respective strands 12a, 12b are selected so that they follow the entire spring deflection of the spring 13a, 13b can. In other words: the strands 12a, 12b are at least so long that they are not torn off the respective contact plug 11a, 11b when the contact plug 11a, 11b is moved in direction A over the entire distance.
  • vibration-related relative movements e.g. in the direction of arrows A and B
  • the damping element 13a, 13b designed as a spring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Battery Mounting, Suspending (AREA)

Description

Die vorliegende Erfindung betrifft eine Werkzeugmaschine enthaltend eine Aufnahmevorrichtung mit wenigstens einem Aufnahmeelement und eine mit der Werkzeugmaschine verbindbare Energieversorgungseinheit, beispielsweise einen Akkumulator, mit einer Anschlusseinrichtung, wobei die Anschlusseinrichtung wenigstens ein Kontaktelement enthält, wobei die Aufnahmevorrichtung ausgestaltet ist, um die Anschlusseinrichtung aufzunehmen und zu halten, sodass das wenigstens eine Aufnahmeelement und das wenigstens eine Kontaktelement zum Herstellen einer elektrischen Verbindung miteinander verbindbar sind.The present invention relates to a machine tool containing a receiving device with at least one receiving element and an energy supply unit that can be connected to the machine tool, for example an accumulator, with a connection device, the connection device containing at least one contact element, the receiving device being designed to receive and hold the connection device , So that the at least one receiving element and the at least one contact element for establishing an electrical connection can be connected to one another.

Kabellose Werkzeugmaschine können zur Stromversorgung mit einem Akkumulator betrieben werden. Der Akkumulator ist dabei von der Werkzeugmaschine abnehmbar, um diesen in einer Ladevorrichtung wieder mit elektrischem Strom aufladen zu können.Cordless machine tools can be operated with an accumulator for power supply. The accumulator can be removed from the machine tool so that it can be recharged with electricity in a charging device.

In einem zusammengebauten Zustand, d.h. wenn die Werkzeugmaschine und der Akkumulator miteinander verbunden sind, erfolgt die Übertragung des elektrischen Stroms von dem Akkumulator zu der Werkzeugmaschine mittels elektrischer Kontaktpartner. Die Kontaktpartner bestehen dabei jeweils aus einem ersten und zweiten Kontaktelement, die miteinander verbindbar sind. Das erste elektrische Kontaktelement ist an dem Akkumulator und das zweite Kontaktelement ist an der Werkzeugmaschine angeordnet. Für gewöhnlich wird das zweite Kontaktelement in das erste Kontaktelement geschoben. Das zweite Kontaktelement kann auch als Aufnahmeelement bezeichnet werden, da es unter anderem dazu geeignet ist, elektrischen Strom für die Werkzeugmaschine aufzunehmen.In an assembled state, i.e. when the machine tool and the accumulator are connected to one another, the electric current is transmitted from the accumulator to the machine tool by means of electrical contact partners. The contact partners each consist of a first and second contact element that can be connected to one another. The first electrical contact element is arranged on the accumulator and the second contact element is arranged on the machine tool. The second contact element is usually pushed into the first contact element. The second contact element can also be referred to as a receiving element, since it is suitable, among other things, for receiving electrical current for the machine tool.

Im Betrieb der Werkzeugmaschine kann aufgrund von applikationsbedingten Vibrationen bzw. Schwingungen auf die elektrischen Kontaktelemente eine hohe mechanische Last in Form von Beschleunigungskräfte wirken. Neben dieser mechanischen Last kann auch noch eine elektrische Last in Form von elektrischen Strom wirken.During operation of the machine tool, a high mechanical load in the form of acceleration forces can act on the electrical contact elements due to application-related vibrations or oscillations. In addition to this mechanical load, there can also be an electrical load in the form of electrical current.

Diese mechanische Last kann zu Relativbewegungen zwischen den werkzeugmaschinen- und akkuseitigen Kontaktelementen führen, wodurch die Kontaktelemente verschleißen. Je nach Anwendung der Werkzeugmaschine kann dieser Verschleiß zusätzlich noch durch einen Staubeintrag zwischen den Kontaktelementen verstärkt werden. Durch die vibrationsbedingte Relativbewegung zwischen den Kontaktelementen sowie durch eine verschleißbedingte Erhöhung des Übergangswiderstands der Kontaktelemente kann es zu einer thermischen Überlastung der Kontaktelemente kommen, die bis zu einem Abbrand der Kontaktelemente führen kann. Dokument EP 2 602 880 offenbart ein als Feder ausgestaltetes Dämpfungselement und ein Kontaktelement, wobei die Federn nicht in einer (ersten) Richtung hinter der Kontaktelementen positioniert sind. Dokument EP 1 036 636 A1 offenbart eine elektrische Werkzeugmaschine mit einer Aufnahmevorrichtung für einen Batteriepack und einen Stecker (Kontaktelement), wobei Federn und bewegliche Elemente in einer Führungsbohrung der Batterie-Baueinheit (bzw. auf dem Batteriepack) angeordnet sind, sodass Erschütterungen, die auf das Bohrgerät einwirken, oder von dem Bohrgerät selbst hervorgerufen werden können, keine Relativbewegung zwischen der Batterie-Baueinheit und dem Gehäuse verursachen.This mechanical load can lead to relative movements between the machine tool and battery-side contact elements, causing the contact elements to wear out. Depending on the application of the machine tool, this wear can also be intensified by the ingress of dust between the contact elements. By the vibration-related relative movement between the contact elements and by a wear-related Increasing the transition resistance of the contact elements can lead to a thermal overload of the contact elements, which can even lead to the contact elements burning away. document EP 2 602 880 discloses a damping element configured as a spring and a contact element, wherein the springs are not positioned behind the contact elements in a (first) direction. document EP 1 036 636 A1 discloses an electric machine tool with a receiving device for a battery pack and a connector (contact element), with springs and movable elements in a guide bore of the battery assembly (or on the battery pack) are arranged so that vibrations that act on the drill, or from which can be caused by the drill itself, do not cause any relative movement between the battery assembly and the housing.

Aufgabe der vorliegenden Erfindung ist es daher, eine Werkzeugmaschine mit verbesserten Kontaktelementen bereitzustellen, bei der ein Verschleiß und insbesondere die Gefahr eines Abbrands der Kontaktelemente vermindert wird.It is therefore the object of the present invention to provide a machine tool with improved contact elements in which wear and in particular the risk of the contact elements being burned off is reduced.

Die Aufgabe wird gelöst durch den Gegenstand des unabhängigen Anspruchs 1.The object is solved by the subject matter of independent claim 1.

Die Aufgabe wird dabei gelöst durch eine Werkzeugmaschine enthaltend eine Aufnahmevorrichtung mit wenigstens einem Aufnahmeelement und eine mit der Werkzeugmaschine verbindbare Energieversorgungseinheit, beispielsweise einen Akkumulator, mit einer Anschlusseinrichtung, wobei die Anschlusseinrichtung wenigstens ein Kontaktelement enthält, wobei die Aufnahmevorrichtung ausgestaltet ist, um die Anschlusseinrichtung aufzunehmen und zu halten, sodass das wenigstens eine Aufnahmeelement und das wenigstens eine Kontaktelement zum Herstellen einer elektrischen Verbindung miteinander verbindbar sind.The object is achieved by a machine tool containing a receiving device with at least one receiving element and an energy supply unit that can be connected to the machine tool, for example a rechargeable battery, with a connection device, the connection device containing at least one contact element, the receiving device being designed to receive the connection device and to hold, so that the at least one receiving element and the at least one contact element for establishing an electrical connection are connected to each other.

Erfindungsgemäß ist vorgesehen, dass an dem wenigstens einen Kontaktelement ein Dämpfungselement vorgesehen ist, wodurch das wenigstens eine Kontaktelement in eine erste Richtung und zweite Richtung sowie relativ zu dem jeweiligen Aufnahmeelement beweglich ist, sodass einer Relativbewegung zwischen dem Kontaktelement und dem jeweiligen Aufnahmeelement entgegenwirkbar ist, wenn das Kontaktelement und Aufnahmeelement miteinander verbunden sind.According to the invention, a damping element is provided on the at least one contact element, as a result of which the at least one contact element can be moved in a first direction and a second direction and relative to the respective receiving element, so that a relative movement between the contact element and the respective receiving element can be counteracted if the contact element and receiving element are connected to one another.

Hierdurch kann einer Relativbewegung zwischen dem Kontaktelement und Aufnahmeelement reduziert und somit der vibrationsbedingte Verschleiß an dem Kontaktelement und Aufnahmeelement entgegengewirkt werden.As a result, a relative movement between the contact element and receiving element can be reduced and thus the wear and tear on the contact element and receiving element caused by vibration can be counteracted.

Gemäß der vorliegenden Erfindung ist vorgesehen, dass das Dämpfungselement als Feder ausgestaltet ist und in der ersten Richtung hinter dem Kontaktelement positioniert ist, sodass eine von dem als Feder ausgestalteten Dämpfungselement ausgeübte Federkraft das Kontaktelement in die zweite Richtung drückt. Hierdurch kann insbesondere der größten Bewegungsfreiheit des Kontaktelements relativ zu dem Aufnahmeelement effektiv entgegengewirkt werden.According to the present invention, it is provided that the damping element is designed as a spring and is positioned behind the contact element in the first direction, so that a spring force exerted by the damping element designed as a spring presses the contact element in the second direction. In this way, in particular, the greatest freedom of movement of the contact element relative to the receiving element can be effectively counteracted.

Gemäß einer nicht Erfindungsgemäß Ausgestaltungsform ist es jedoch auch möglich, dass das Dämpfungselement als ein Bauteil mit einem elastisch verformbaren Werkstoff ausgestaltet ist. Als Werkstoff ist dabei ein Elastomer oder jeder andere geeignete formfeste, aber elastisch verformbare Kunststoffe möglich.However, according to an embodiment not according to the invention, it is also possible for the damping element to be designed as a component with an elastically deformable material. An elastomer or any other suitable dimensionally stable but elastically deformable plastic is possible as the material.

Hierdurch kann auf einfache Art und Weise einer vibrationsbedingten Bewegung des Kontaktelements in mehreren Richtungen, d.h. nicht nur in der Richtung zu oder entgegen dem Aufnahmeelement, entgegengewirkt werden.In this way, a vibration-induced movement of the contact element in a number of directions, ie not only in the direction towards or against the receiving element, can be counteracted in a simple manner.

Weitere Vorteile ergeben sich aus der folgenden Figurenbeschreibung. In den Figuren sind verschiedene Ausführungsbeispiele der vorliegenden Erfindung dargestellt. Die Figuren, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmässigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the figures. Various exemplary embodiments of the present invention are shown in the figures. The figures, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them to form further meaningful combinations.

Es zeigen:

Fig. 1
eine Seitenansicht einer erfindungsgemäßen Werkzeugmaschine mit einem an der Werkzeugmaschine angeschlossenen Akkumulator;
Fig. 2
eine weitere Seitenansicht der erfindungsgemäßen Werkzeugmaschine mit einem von der Werkzeugmaschine abgenommenen Akkumulator;
Fig. 3
eine Schnittansicht entlang der Schnittlinie A-A in Fig. 1, wobei der Akkumulator und die Werkzeugmaschine voneinander getrennt sind; und
Fig. 4
eine weitere Schnittansicht entlang der Schnittlinie B-B in Fig. 2, wobei der Akkumulator und die Werkzeugmaschine miteinander verbunden sind.
Show it:
1
a side view of a machine tool according to the invention with an accumulator connected to the machine tool;
2
another side view of the machine tool according to the invention with a battery removed from the machine tool;
3
a sectional view along section line AA in 1 , wherein the accumulator and the machine tool are separated from each other; and
4
another sectional view along section line BB in 2 , wherein the accumulator and the machine tool are connected to each other.

Ausführungsbeispiele:Examples:

In den Figuren 1 und 2 ist eine beispielhafte Ausführungsform der erfindungsgemäßen Werkzeugmaschine 1 dargestellt.In the figures 1 and 2 an exemplary embodiment of the machine tool 1 according to the invention is shown.

Die Werkzeugmaschine 1 ist dabei in Form einer Bohrmaschine ausgestaltet. Es ist jedoch auch möglich, dass es sich bei der Werkzeugmaschine 1 um einen Bohrhammer, eine Kreissäge oder dergleichen handelt.The machine tool 1 is designed in the form of a drill. However, it is also possible for the machine tool 1 to be a hammer drill, a circular saw or the like.

Die in den Figuren 1 und 2 dargestellte Werkzeugmaschine 1 enthält im Wesentlichen ein Gehäuse 2, eine Werkzeugaufnahme 3, einen Handgriff 4 mit einem Aktivierungsschalter 5. Des Weiteren enthält die Werkzeugmaschine 1 eine Aufnahmevorrichtung 6 für eine Energieversorgungseinheit 7. Wie in den Figuren 1 bis 4 gezeigt, ist die Energieversorgungseinheit 7 als Akkumulator, auch Akku genannt, ausgestaltet.The in the figures 1 and 2 The machine tool 1 shown essentially contains a housing 2, a tool holder 3, a handle 4 with an activation switch 5. The machine tool 1 also contains a receiving device 6 for a power supply unit 7. As in FIGS Figures 1 to 4 shown, the energy supply unit 7 is designed as an accumulator, also called an accumulator.

Gemäß einer alternativen (nicht in den Figuren dargestellte) Ausgestaltungsform der vorliegenden Erfindung kann die Energieversorgungseinheit 7 auch als Anschlusseinheit mit einem Stromkabel zur Verbindung mit einem Stromnetz ausgestaltet sein.According to an alternative embodiment of the present invention (not shown in the figures), the power supply unit 7 can also be designed as a connection unit with a power cable for connection to a power grid.

In Figur 1 ist ein Zustand dargestellt, bei dem die als Akku ausgestaltete Energieversorgungseinheit 7 mit der Werkzeugmaschine 1 verbunden ist. Der Akku 7 wird hierzu in Pfeilrichtung B auf die Aufnahmevorrichtung 6 geschoben. Wie in Figur 2 dargestellt, kann der Akku 7 entsprechend der Pfeilrichtung A (und gegen die Pfeilrichtung B) wieder von der Aufnahmevorrichtung 6 und damit von der Werkzeugmaschine 1 entfernt werden. Die Energieversorgungseinheit 7 wird mit einer nicht gezeigten Verschlussvorrichtung an der Werkzeugmaschine 1 gehalten.In figure 1 a state is shown in which the energy supply unit 7 configured as a rechargeable battery is connected to the machine tool 1 . For this purpose, the rechargeable battery 7 is pushed onto the receiving device 6 in the direction of the arrow B. As in figure 2 shown, the rechargeable battery 7 can be removed again from the receiving device 6 and thus from the machine tool 1 in accordance with the direction of the arrow A (and counter to the direction of the arrow B). The power supply unit 7 is held on the machine tool 1 with a locking device that is not shown.

Das Gehäuse 2 weist ein erstes Ende 2a und ein zweites Ende 2b auf. An einem ersten Ende 2a des Gehäuses 2 ist die Werkzeugaufnahme 3 positioniert. Die Werkzeugaufnahme 3 dient zum Aufnahmen und wiederlösbaren Halten eines Werkzeugs 8. Das in den Figuren 1 und 2 gezeigte Werkzeug 8 ist in Form eines Bohrers ausgestaltet.The housing 2 has a first end 2a and a second end 2b. The tool holder 3 is positioned at a first end 2a of the housing 2 . The tool holder 3 is used to record and releasably hold a tool 8. The in the figures 1 and 2 Tool 8 shown is designed in the form of a drill.

Der Handgriff 4 enthält den Aktivierungsschalter 5, ein erstes Ende 4a sowie ein zweites Ende 4b. Der Aktivierungsschalter 5 dient zum Betätigen der Werkzeugmaschine 1.The handle 4 includes the activation switch 5, a first end 4a and a second end 4b. The activation switch 5 is used to actuate the machine tool 1.

An einem zweiten Ende 2b des Gehäuses und unterhalb des Gehäuses 2 ist das erste Ende 4a des Handgriffs 4 befestigt.At a second end 2b of the housing and below the housing 2, the first end 4a of the handle 4 is attached.

An dem zweiten Ende 4b des Handgriffs 4 ist die Aufnahmevorrichtung 6 für die als Akku ausgestaltete Energieversorgungseinheit 7 positioniert.Positioned on the second end 4b of the handle 4 is the receiving device 6 for the energy supply unit 7 designed as a rechargeable battery.

Wie in Figur 3 und 4 dargestellt, enthält die Aufnahmevorrichtung 6 ein erstes Aufnahmeelement 6a und zweites Aufnahmeelement 6b. Alternativ können auch mehr als zwei Aufnahmeelemente vorgesehen sein. Es ist dabei möglich, dass ein Aufnahmeelement sowohl einen Pluspol als auch einen Minuspol zur elektrischen Stromversorgung enthält. Sowohl das erste und zweite Aufnahmeelement 6a, 6b ist in Form eines Kontaktbleches ausgestaltet. Alternativ kann das das erste und zweite Aufnahmeelement 6a, 6b auch als Zylinder ausgestaltet sein.As in figure 3 and 4 shown, the receiving device 6 includes a first receiving element 6a and a second receiving element 6b. Alternatively, more than two receiving elements can also be provided. It is possible for a receiving element to contain both a positive pole and a negative pole for the electrical power supply. Both the first and second receiving element 6a, 6b is designed in the form of a contact plate. Alternatively, the first and second receiving element 6a, 6b can also be configured as a cylinder.

Die als Akku ausgestaltete Energieversorgungseinheit 7 enthält im Wesentlichen ein Gehäuse 9, in dem eine Anzahl an einzelnen miteinander verbundenen Energiespeicherzellen, auch Akkuzellen genannt, positioniert sind. Mit Hilfe der Akkuzellen kann elektrische Energie in dem Akku 7 gespeichert werden.The energy supply unit 7 designed as a rechargeable battery essentially contains a housing 9 in which a number of individual interconnected energy storage cells, also called rechargeable battery cells, are positioned. Electrical energy can be stored in the rechargeable battery 7 with the aid of the rechargeable battery cells.

Die Akkuzellen sind in den Figuren nicht dargestellt.The battery cells are not shown in the figures.

An einem oberen Ende des Gehäuses 9 ist eine Anschlusseinrichtung 9a mit einem ersten Kontaktelement 10a und einem zweiten Kontaktelement 10b positioniert. Die Anschlusseinrichtung 9a dient zum Verbinden mit der Aufnahmevorrichtung 6. Hierzu wird die Anschlusseinrichtung 9a in die Aufnahmevorrichtung 6 geschoben und von dieser gehalten. Alternativ können auch mehr als zwei Kontaktelemente vorgesehen sein. Es ist dabei möglich, dass ein Kontaktelement sowohl einen Pluspol als auch einen Minuspol zur elektrischen Stromversorgung enthält.A connection device 9a with a first contact element 10a and a second contact element 10b is positioned at an upper end of the housing 9 . The connecting device 9a serves to connect to the receiving device 6. For this purpose, the connecting device 9a is pushed into the receiving device 6 and held by it. Alternatively, more than two contact elements can also be provided. It is possible that a contact element contains both a positive pole and a negative pole for electrical power supply.

Das erste Kontaktelement 10a dient zum widerlösbaren Verbinden mit dem ersten Aufnahmeelement 6a und das zweite Kontaktelement 10b dient zum widerlösbaren Verbinden mit dem zweiten Aufnahmeelement 6b (vgl. Fig. 3 und 4). Durch die Verbindung des ersten und zweiten Kontaktelements 10a, 10b mit dem jeweiligen ersten und zweiten Aufnahmeelement 6a, 6b kann die in den Akkuzellen gespeicherte elektrische Energie von dem Akku 7 in die Aufnahmevorrichtung 6 geleitet werden. Die elektrische Energie wird anschließend an elektrische Verbraucher in der Werkzeugmaschine 1 weitergeleitet.The first contact element 10a serves for the detachable connection to the first receiving element 6a and the second contact element 10b serves for the detachable connection to the second receiving element 6b (cf. 3 and 4 ). By connecting the first and second contact element 10a, 10b to the respective first and second receiving element 6a, 6b, the electrical energy stored in the battery cells can be conducted from the battery 7 into the receiving device 6. The electrical energy is then passed on to electrical consumers in the machine tool 1 .

Bei der nicht gezeigten Ausgestaltungsform, bei der die Energieversorgungseinheit 7 nicht als Akku, sondern als Anschlusseinheit für ein Netzstrom ausgestaltet ist, enthält die Anschlusseinheit ebenfalls ein erstes Kontaktelement 10a und zweites Kontaktelement 10b zum jeweiligen Verbinden und Herstellen einer elektrischen Verbindung mit dem ersten und zweiten Aufnahmeelement 6a, 6b der Aufnahmevorrichtung 6.In the embodiment that is not shown, in which the energy supply unit 7 is not designed as a rechargeable battery but as a connection unit for a mains current, the connection unit also contains a first contact element 10a and a second contact element 10b for the respective connection and establishment of an electrical connection with the first and second receiving element 6a, 6b of the receiving device 6.

In dem Gehäuse 2 der Werkzeugmaschine 1 ist ein Elektromotor zum Erzeugen eines Drehmoments positioniert. Der Elektromotor ist damit ein elektrischer Verbraucher von elektrischer Energie. Das in dem Elektromotor erzeugte Drehmoment wird über eine Abtriebswelle und ein Getriebe auf die Werkzeugaufnahme 3 übertragen. Mit Hilfe des übertragenen Drehmoments wird das Werkzeug 8 gedreht. In den Figuren ist weder der Elektromotor, die Abtriebswelle noch das Getriebe gezeigt.An electric motor for generating a torque is positioned in the housing 2 of the machine tool 1 . The electric motor is thus an electrical consumer of electrical energy. The torque generated in the electric motor is transmitted to the tool holder 3 via an output shaft and a gear. With the help of transmitted torque, the tool 8 is rotated. Neither the electric motor, the output shaft nor the gearing is shown in the figures.

Wie insbesondere in Figur 3 und 4 dargestellt, enthält das erste Kontaktelement 10a einen ersten Kontaktstecker 11a, eine erste Litze 12a und ein erstes Dämpfungselement 13a. Das zweite Kontaktelement 10b enthält einen zweiten Kontaktstecker 11b, eine zweite Litze 12b und ein zweites Dämpfungselement 13b. Der erste Kontaktstecker 10a enthält ein erstes Ende 14a und ein zweites Ende 15a. Der zweite Kontaktstecker 11b enthält ein erstes Ende 14b und ein zweites Ende 15b. Die erste Litze 12a ist an dem zweiten Ende 15a des ersten Kontaktsteckers 10a und die zweite Litze 12b ist an dem zweiten Ende 15b des zweiten Kontaktsteckers 10b verbunden. Die Litzen 12a, 12b sind flexibel ausgestaltet und lassen eine Bewegung der Kontaktstecker 11a, 11b in Richtung A und B zu. Des Weiteren dienen die Litzen 12a, 12b der Übertragung der elektrischen Energie von den Akkuzellen an das jeweilige Kontaktelement 10a, 10b.As in particular in figure 3 and 4 shown, the first contact element 10a contains a first contact plug 11a, a first stranded wire 12a and a first damping element 13a. The second contact element 10b contains a second contact plug 11b, a second stranded wire 12b and a second damping element 13b. The first contact plug 10a includes a first end 14a and a second end 15a. The second contact plug 11b includes a first end 14b and a second end 15b. The first strand 12a is connected to the second end 15a of the first contact plug 10a and the second strand 12b is connected to the second end 15b of the second contact plug 10b. The strands 12a, 12b are designed to be flexible and allow the contact plugs 11a, 11b to move in the A and B directions. Furthermore, the strands 12a, 12b serve to transmit the electrical energy from the battery cells to the respective contact element 10a, 10b.

Des Weiteren befindet sich das erste Kontaktelement 10a in einer ersten Kontaktkammer 16a und das zweite Kontaktelement 10b befindet sich in einer zweiten Kontaktkammer 16b. Die beiden Kontaktkammern 16a, 16b sind im Wesentlichen als Ausbuchtungen für die jeweiligen Kontaktelemente 10a, 10b ausgestaltet und nebeneinander an einem oberen Ende 17 des Akku-Gehäuses 9 positioniert. Jede als Ausbuchtung ausgestaltete Kontaktkammer 16a, 16b weist damit eine Öffnung 18a, 18b auf, durch die die Kontaktstecker 11a, 11b in der Kontaktkammer 16a, 16b zugänglich sind. Die beiden Kontaktstecker 11a, 11b sind dabei so in den jeweiligen Kontaktkammern 16a, 16b angeordnet, dass das erste Ende 14a, 14b der jeweiligen Kontaktstecker 11a, 11b der Öffnung 18a, 18b der Kontaktkammer 16a, 16b zugewandt ist.Furthermore, the first contact element 10a is located in a first contact chamber 16a and the second contact element 10b is located in a second contact chamber 16b. The two contact chambers 16a, 16b are essentially designed as bulges for the respective contact elements 10a, 10b and are positioned next to one another at an upper end 17 of the battery housing 9. Each contact chamber 16a, 16b designed as a bulge thus has an opening 18a, 18b through which the contact plugs 11a, 11b in the contact chamber 16a, 16b are accessible. The two contact plugs 11a, 11b are arranged in the respective contact chambers 16a, 16b in such a way that the first end 14a, 14b of the respective contact plug 11a, 11b faces the opening 18a, 18b of the contact chamber 16a, 16b.

Des Weiteren enthält der erste Kontaktstecker 11a ein erstes Kontaktblatt 19a und zweites Kontaktblatt 19b und der zweite Kontaktstecker 11b enthält ein erstes Kontaktblatt 20a und zweites Kontaktblatt 20b.Furthermore, the first contact plug 11a contains a first contact sheet 19a and second contact sheet 19b, and the second contact plug 11b contains a first contact sheet 20a and second contact sheet 20b.

Wie in Figur 3 angedeutet, sind die Kontaktblätter 19a, 19b, 20a, 20b beweglich bzw. flexibel ausgestaltet, sodass das erste Kontaktblatt 19a, 20a in Pfeilrichtung C und das zweite Kontaktblatt 19b, 20b in Pfeilrichtung D reversibel bzw. elastisch geschwenkt werden kann. Die Beweglichkeit der Kontaktblätter 19a, 19b, 20a, 20b dient dazu, die jeweiligen als Kontaktbleche ausgestalteten Aufnahmeelement 6a, 6b aufnehmen zu können, sodass jedes Kontaktblech an dem ersten und zweiten Kontaktblatt 19a, 19b, 20a, 20b anliegt, wenn der Akku 7 ordnungsgemäß mit der Werkzeugmaschine 1 verbunden ist (vgl. Fig. 4).As in figure 3 indicated, the contact sheets 19a, 19b, 20a, 20b are designed to be movable or flexible, so that the first contact sheet 19a, 20a can be pivoted reversibly or elastically in the direction of arrow C and the second contact sheet 19b, 20b in the direction of arrow D. The mobility of the contact sheets 19a, 19b, 20a, 20b serves to accommodate the receiving elements 6a, 6b designed as contact sheets, so that each contact sheet is in contact with the first and second contact sheets 19a, 19b, 20a, 20b when the battery 7 is properly is connected to the machine tool 1 (cf. 4 ).

Das erste und zweite Dämpfungselement 13a, 13b ist entsprechend der vorliegenden Erfindung als Federn ausgestaltet. Die Feder 13a dabei ein erstes Ende 21a sowie zweites Ende 22a und die Feder 13b dabei ein erstes Ende 21b und zweites Ende 22b. Jedes als Feder ausgestaltete Dämpfungselement 13a, 13b ist so in der jeweiligen Kontaktkammer 16a, 16b und so zu dem jeweiligen Kontaktstecker 11a, 11b angeordnet, dass das erste Ende 21a, 21b der Feder 13a, 13b an dem zweiten Ende 15a, 15b des jeweiligen Kontaktsteckers 11a, 11b anliegt. Das zweite Ende 22a, 22b jeder Feder 13a, 13b liegt an einer Rückwand 23, 24 einer jeden Kontaktkammer 16a, 16b an. Die Federkraft jeder Feder 13a, 13b drückt damit den jeweiligen Kontaktstecker 11a, 11b in Pfeilrichtung A. Es ist zu beachten, dass die Länge und Beschaffenheit der jeweiligen Litzen 12a, 12b so gewählt ist, dass diese dem gesamten Federweg der Feder 13a, 13b folgen können. Mit anderen Worten: die Litzen 12a, 12b sind wenigstens so lang, dass diese nicht von dem jeweiligen Kontaktstecker 11a, 11b abgerissen werden, wenn der Kontaktstecker 11a, 11b über die gesamte Wegstrecke in Richtung A bewegt wird.According to the present invention, the first and second damping element 13a, 13b are designed as springs. The spring 13a has a first end 21a and a second end 22a and the spring 13b has a first end 21b and a second end 22b. Each damping element 13a, 13b designed as a spring is arranged in the respective contact chamber 16a, 16b and in relation to the respective contact plug 11a, 11b such that the first end 21a, 21b of the spring 13a, 13b is at the second end 15a, 15b of the respective contact plug 11a, 11b. The second end 22a, 22b of each spring 13a, 13b bears against a rear wall 23, 24 of each contact cavity 16a, 16b. The spring force of each spring 13a, 13b thus presses the respective contact plug 11a, 11b in the direction of arrow A. It should be noted that the length and nature of the respective strands 12a, 12b are selected so that they follow the entire spring deflection of the spring 13a, 13b can. In other words: the strands 12a, 12b are at least so long that they are not torn off the respective contact plug 11a, 11b when the contact plug 11a, 11b is moved in direction A over the entire distance.

Mit Hilfe des als Feder ausgestalteten Dämpfungselements 13a, 13b können vibrationsbedingte Relativbewegungen (z.B. in Pfeilrichtung A und B), die entstehen, wenn die Werkzeugmaschine 1 in Verwendung ist, zwischen dem Kontaktelement 10a, 10b und dem Aufnahmeelement 6a, 6b ausgeglichen werden.With the help of the damping element 13a, 13b designed as a spring, vibration-related relative movements (e.g. in the direction of arrows A and B), which occur when the machine tool 1 is in use, can be compensated for between the contact element 10a, 10b and the receiving element 6a, 6b.

Claims (1)

  1. Power tool (1), for example a drilling machine, comprising
    - a receiving apparatus (6) having at least one receiving element (6a, 6b); and
    - a power supply unit (7), for example a rechargeable battery, which has a connection device (9a) and can be connected to the power tool (1), wherein the connection device (9a) comprises at least one contact element (10a, 10b);
    wherein the receiving apparatus (6) is configured to receive and hold the connection device (9a), so that the at least one receiving element (6a, 6b) and the at least one contact element (10a, 10b) can be connected to one another in order to establish an electrical connection, wherein a damping element (13a, 13b) is provided on the at least one contact element (10a, 10b), as a result of which the at least one contact element (10a, 10b) can be moved in a first direction (A) and second direction (B) as well as relative to the respective receiving element (6a, 6b), so that a relative movement between the contact element (10a, 10b) and the respective receiving element (6a, 6b) can be counteracted when the contact element (10a, 10b) and receiving element (6a, 6b) are connected to one another,
    characterized in that the damping element (13a, 13b) is configured as a spring and is positioned behind the contact element (10a, 10b), in the first direction (A), so that a spring force exerted by the damping element (13a, 13b) configured as a spring pushes the contact element (10a, 10b) in the second direction (B).
EP18727145.7A 2017-04-21 2018-04-16 Spring contacts for a battery Active EP3613105B1 (en)

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WO2018192870A1 (en) 2018-10-25
US20200153142A1 (en) 2020-05-14
EP3392974A1 (en) 2018-10-24
EP3613105A1 (en) 2020-02-26
US11699870B2 (en) 2023-07-11
CN110521064A (en) 2019-11-29
US11289842B2 (en) 2022-03-29
US20220181813A1 (en) 2022-06-09

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