EP1986211B1 - Machine switch and work table for hand tools - Google Patents

Machine switch and work table for hand tools Download PDF

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Publication number
EP1986211B1
EP1986211B1 EP08006899.2A EP08006899A EP1986211B1 EP 1986211 B1 EP1986211 B1 EP 1986211B1 EP 08006899 A EP08006899 A EP 08006899A EP 1986211 B1 EP1986211 B1 EP 1986211B1
Authority
EP
European Patent Office
Prior art keywords
machine
switch
self
machine switch
phase line
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.)
Not-in-force
Application number
EP08006899.2A
Other languages
German (de)
French (fr)
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EP1986211A2 (en
EP1986211A3 (en
Inventor
Bernhard Niemann
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication date
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Publication of EP1986211A2 publication Critical patent/EP1986211A2/en
Publication of EP1986211A3 publication Critical patent/EP1986211A3/en
Application granted granted Critical
Publication of EP1986211B1 publication Critical patent/EP1986211B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/06—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by current falling below a predetermined value
    • 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
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H01R13/6683—Structural association with built-in electrical component with built-in electronic circuit with built-in sensor
    • 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
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • 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
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/652—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding   with earth pin, blade or socket
    • 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
    • H01R24/70—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 with additional earth or shield contacts
    • 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
    • H01R24/76—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with sockets, clips or analogous contacts and secured to apparatus or structure, e.g. to a wall
    • H01R24/78—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with sockets, clips or analogous contacts and secured to apparatus or structure, e.g. to a wall with additional earth or shield contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
    • H01R31/065—Intermediate parts for linking two coupling parts, e.g. adapter with built-in electric apparatus

Definitions

  • the invention relates to a machine switch for a machining table for hand tool machines with the features of the preamble of claim 1 and a machining table for hand tool machines with a machine switch having the features of the preamble of claim 5.
  • a normal table saw, a normal planer or a normal stand-drill has a table frame and a workpiece support surface forming workpiece carrier as well as the tool unit, namely the circular saw unit, the planing unit, the drilling unit o.
  • the tool unit namely the circular saw unit, the planing unit, the drilling unit o.
  • EP-A-0 615 807 Accordingly, such a machine tool also has a machine switch with an ON / OFF switching device, which is preferably designed in the form of an ON / OFF pushbutton.
  • the drive motor starts and the circular saw blade rotates permanently at high speed. If you press the OFF button of the ON / OFF pushbutton, the saw unit is switched off, the circular saw blade comes to a standstill.
  • the drive motor of a circular saw works only if you manually operated a manual switch on the operating handle. If you build the circular saw on a working table of the type in question, the handset is blocked or fixed in the ON position.
  • the switching of the drive motor of the portable circular saw is replaced by the additionally present on the machining table machine switch with manual ON / OFF switching device, preferably in the form of an ON / OFF pushbutton.
  • such machine mounted on the editing machine switch has a power supply in the form of a power connector and a machine connection in the form of a standard connection box, in which the power connector of the circular saw is simply plugged. If the processing table or its machine switch then connected to the mains as a whole, the circular saw unit of the circular saw can be switched on and off as the circular saw unit of a normal table saw by means of the ON / OFF switching device.
  • the prior art from which the invention is based discloses a switch for a star-connected three-phase asynchronous motor which is in principle suitable as a machine switch for a processing table for handheld power tools ( EP 1 744 431 A2 ).
  • This machine switch already shows a self-holding circuit for self-holding the ON position of the ON / OFF switching device. The above-described problem of "loose contact" is not addressed in this machine switch.
  • the teaching is thus based on the problem of improving the safety of the known machine switch for a processing table for hand tool machines or a processing table equipped therewith.
  • the machine switch has a self-holding circuit which has a current sensor on the phase line and / or the neutral line.
  • This self-holding circuit is designed so that the self-holding the ON position of the ON / OFF switching device does not occur or ends, if the load current on the phase line or the neutral line is below a certain value or falls below.
  • the ON button of the ON / OFF switching device latching does not take effect because the drive motor of the power tool does not start and therefore draws no electricity.
  • the ON button jumps back, the hand tool remains disconnected from the mains, there is no risk of an accident.
  • the self-holding falls off immediately, if a shaking contact interrupts the current flow during work with the machine tool for a short time.
  • a machining table for hand tool machines in which the above-indicated problem is solved, is equipped with a machine switch according to one of claims 1 to 4. It is described in claim 5, A preferred embodiment of this editing table is the subject of claim 6.
  • Fig. 1 shown is a processing table for hand tool 5 with a table frame 1, a mounted on the table frame 1, a workpiece support surface 2 forming workpiece carrier 3, an attachment device 4 for stationary attachment of a power tool 5, in particular a circular saw, a hand drill o. The like., And a machine switch
  • the illustrated embodiment shows the power tool 5 as a circular saw with a saw slot 7 in the workpiece carrier 3 from below penetrating saw blade.
  • FIG. 1 left front on the table frame 1 drawn in and Fig. 2
  • Machine switch 6 shown enlarged as such initially shows a mains connection 9, here and preferably in the form of a mains connection plug, as well as a machine connection 10, here and preferably in the form of a cover box covered with a lid.
  • a power cord for connecting the machine switch 6 to the mains and a machine connection cable with which the power tool 5 is connected to the machine connection 10 of the machine switch 6.
  • a manual ON / OFF switching device 11 Shown is a manual ON / OFF switching device 11, which is here and preferably designed as an ON / OFF pushbutton.
  • the whole sits in a switch housing 12 which is attachable by means of a mounting plate 13 on the table frame 1.
  • Fig. 3 shows that provided in the interior of the machine switch 6 circuitry between the power supply 9 and the machine terminal 10 at least one actuated by the ON / OFF switching device 11 switching contact 14 in the phase line 15 and / or the neutral line 16 and at least one switch contact 14 machine connection side connected, between phase line 15 and neutral line 16 connected self-holding circuit 17 for self-holding the ON position of the ON / OFF switching device 11 and that the self-holding circuit 17 has a current sensor 18 on the phase line 15 and / or the neutral line 16 and is designed so that the self-holding of the ON position does not take place or ends, provided that the load current on the phase line 15 or the neutral line 16 is below a certain value or falls below this value.
  • Fig. 3 and Fig. 4 also a conventional protective conductor 20, as it is prescribed in Germany safety.
  • the specific value of the load current for the machine switch 6 is about 1.2 A.
  • the current sensor 18 is shown schematically on the phase line 15 of the circuit arrangement.
  • the detailed circuit arrangement in FIG Fig. 4 in that there the current sensor 18 is part of a current monitor circuit 19 inserted into the phase line 15 on the machine connection side.
  • the result of the current monitoring of the phase line 15 shown is that the latching means of the Self-holding circuit 17 only intervenes when the drive motor of the power tool 5 actually starts at ON operation of the ON / OFF switching device 11 and draws a corresponding amount of power.
  • a low quiescent current or residual current is not sufficient, because a lower limit is specified.
  • the invention also relates to a machine switch for machine tools such as circular saws, drills o. The like. For themselves with the special features that have been previously described in detail for the machine switch used in the invention.

Description

Die Erfindung betrifft einen Maschinenschalter für einen Bearbeitungstisch für Handwerkzeugmaschinen mit den Merkmalen des Oberbegriffs von Anspruch 1 sowie einen Bearbeitungstisch für Handwerkzeugmaschinen mit einem Maschinenschalter mit den Merkmalen des Oberbegriffs von Anspruch 5.The invention relates to a machine switch for a machining table for hand tool machines with the features of the preamble of claim 1 and a machining table for hand tool machines with a machine switch having the features of the preamble of claim 5.

Eine normale Tischkreissäge, eine normale Hobelmaschine oder eine normale Stand-Bohrmaschine hat ein Tischgestell und einen eine Werkstückauflagefläche bildende Werkstückträger sowie eben das Werkzeugaggregat, nämlich das Kreissägeaggregat, das Hobelaggregat, das Bohraggregat o. dgl. ( EP-A-0 615 807 ). Eine solche Werkzeugmaschine hat dementsprechend auch einen Maschinenschalter mit einer EIN/AUS-Schalteinrichtung, die vorzugsweise in Form eines EIN/AUS-Drucktasters ausgeführt ist.A normal table saw, a normal planer or a normal stand-drill has a table frame and a workpiece support surface forming workpiece carrier as well as the tool unit, namely the circular saw unit, the planing unit, the drilling unit o. The like. EP-A-0 615 807 ). Accordingly, such a machine tool also has a machine switch with an ON / OFF switching device, which is preferably designed in the form of an ON / OFF pushbutton.

Wird beispielsweise das Kreissägeaggregat mittels der EIN/AUS-Schalteinrichtung eingeschaltet, so läuft der Antriebsmotor an und das Kreissägeblatt rotiert dauerhaft mit hoher Drehzahl. Drückt man die AUS-Taste des EIN/AUS-Drucktasters, so wird das Sägeaggregat abgeschaltet, das Kreissägeblatt kommt zum Stillstand.For example, if the circular saw unit is turned on by means of the ON / OFF switching device, the drive motor starts and the circular saw blade rotates permanently at high speed. If you press the OFF button of the ON / OFF pushbutton, the saw unit is switched off, the circular saw blade comes to a standstill.

Eine ähnliche Funktionsweise hat jede stationäre oder halbstationäre Werkzeugmaschine, so daß die nachfolgenden Erläuterungen, auch wenn Sie primär mit einem Kreissägeaggregat zu tun haben, für alle anderen Arten von Werkzeugmaschinen gelten sollen. Bevorzugte Anwendungsfall der Lehre ist allerdings in der Tat eine Kreissägemaschine.A similar operation has any stationary or semi-stationary machine tool, so that the following explanations, even if you are primarily dealing with a circular saw unit, should apply to all other types of machine tools. However, the preferred application of the teaching is indeed a circular saw machine.

Neben stationären und halbstationären Werkzeugmaschinen der in Rede stehenden Art sind auch entsprechende Handwerkzeugmaschinen, also Handkreissägen, Handschleifmaschinen, Handbohrmaschinen o. dgl. bekannt ( DE-U-202 12 403 ).In addition to stationary and semi-stationary machine tools of the type in question are also appropriate hand tool machines, so hand circular saws, hand grinders, hand drills o. The like. Known ( DE-U-202 12 403 ).

Bekannt ist es auch, eine Handwerkzeugmaschine mittels eines halbstationären Bearbeitungstisches mit Tischgestell und Werkstückträger als halbstationäre Werkzeugmaschine nutzbar zu machen. Insbesondere kann man eine Handkreissäge durch Unterbau unter den Werkstückträger eines solchen Bearbeitungstisches mittels einer Anbringungsvorrichtung so anordnen, daß das Kreissägeblatt von unten her durch einen Sägeschlitz im Werkzeugträger wie bei einer normalen halbstationären oder stationären Tischkreissäge nach oben ragt. Dadurch wird die Handkreissäge unter Zuhilfenahme des Bearbeitungstisches als halbstationäre Tischkreissäge nutzbar.It is also known to make a hand tool by means of a semi-stationary machining table with table frame and workpiece carrier usable as a semi-stationary machine tool. In particular, you can use a circular saw arrange by substructure under the workpiece carrier of such a processing table by means of an attachment so that the circular saw blade protrudes from below through a Sägeschlitz in the tool carrier as in a normal semi-stationary or stationary table saw up. As a result, the circular saw can be used with the aid of the editing table as a semi-stationary table circular saw.

Die nachfolgenden Ausführungen beschränken sich auf eine Handkreissäge als Handwerkzeugmaschine, um die Darstellung nicht unnötig kompliziert werden zu lassen. Die nachfolgenden Ausführungen gelten in gleicher Weise für beispielsweise eine Handbohrmaschine oder eine Handfräsmaschine, eine Handschleifmaschine o. dgl.The following explanations are limited to a circular saw as a hand tool, so as not to unnecessarily complicate the presentation. The following statements apply in the same way for example, a hand drill or a hand milling machine, a hand grinder o. The like.

Der Antriebsmotor einer Handkreissäge arbeitet nur, wenn man einen Handschalter am Betätigungshandgriff manuell betätigt. Baut man die Handkreissäge an einen Bearbeitungstisch der in Rede stehenden Art an, so wird der Handschalter in EIN-Stellung blockiert bzw. fixiert. Das Schalten des Antriebsmotors der Handkreissäge wird durch den zusätzlich am Bearbeitungstisch vorhandenen Maschinenschalter mit manueller EIN/-AUS Schalteinrichtung, vorzugsweise in Form eines EIN/AUS-Drucktasters ersetzt. Regelmäßig weist ein solcher am Bearbeitungstisch angebrachter Maschinenschalter einen Netzanschluß in Form eines Netzanschlußsteckers und einen Maschinenanschluß in Form einer normgerechten Anschlußdose auf, in die der Netzanschlußstecker der Handkreissäge einfach eingesteckt wird. Ist der Bearbeitungstisch bzw. dessen Maschinenschalter dann insgesamt ans Netz angeschlossen, so kann das Kreissägeaggregat der Handkreissäge wie das Kreissägeaggregat einer normalen Tischkreissäge mittels der EIN/AUS-Schalteinrichtung eingeschaltet und ausgeschaltet werden.The drive motor of a circular saw works only if you manually operated a manual switch on the operating handle. If you build the circular saw on a working table of the type in question, the handset is blocked or fixed in the ON position. The switching of the drive motor of the portable circular saw is replaced by the additionally present on the machining table machine switch with manual ON / OFF switching device, preferably in the form of an ON / OFF pushbutton. Regularly, such machine mounted on the editing machine switch has a power supply in the form of a power connector and a machine connection in the form of a standard connection box, in which the power connector of the circular saw is simply plugged. If the processing table or its machine switch then connected to the mains as a whole, the circular saw unit of the circular saw can be switched on and off as the circular saw unit of a normal table saw by means of the ON / OFF switching device.

Es hat sich in der Praxis gezeigt, daß bei Bearbeitungstischen der in Rede stehenden Art mitunter in der Praxis Sicherheitsmängel auftreten. Es kann passieren, daß der Handschalter an der Handkreissäge nicht hinreichend fixiert ist oder bezüglich der EIN/AUS-Stellung eine Art "Wackelkontakt" aufweist. Trotz Drückens der EIN-Taste der EIN/AUS-Schalteinrichtung läuft der Antriebsmotor des Sägeaggregates nicht an. Der Benutzer weiß nicht, ob er wirklich eingeschaltet hat. Es kann passieren, daß er am stillstehenden Sägeblatt zu hantieren beginnt und das Kreissägeblatt plötzlich anläuft, weil der "Wackelkontakt" am Handschalter den Laststromkreis plötzlich geschlossen hat.It has been shown in practice that at working tables of the type in question sometimes safety problems occur in practice. It may happen that the hand switch on the circular saw is not sufficiently fixed or with respect to the ON / OFF position has a kind of "loose contact". Despite pressing the ON button of the ON / OFF switching device, the drive motor of the saw unit does not start. The user does not know if he has really turned on. It may happen that he begins to work on the stationary saw blade and the circular saw blade suddenly starts, because the "loose contact" on the handset has suddenly closed the load circuit.

Der Stand der Technik, von dem die Erfindung ausgeht, offenbart einen Schalter für einen in Sternschaltung betriebenen dreiphasigen Asynchronmotor, der im Grundsatz als Maschinenschalter für einen Bearbeitungstisch für Handwerkzeugmaschinen geeignet ist ( EP 1 744 431 A2 ). Dieser Maschinenschalter zeigt bereits eine Selbsthalteschaltung zum Selbsthalten der EIN-Stellung der EIN/AUS-Schalteinrichtung. Das oben geschilderte Problem des "Wackelkontakts" ist bei diesem Maschinenschalter nicht angesprochen.The prior art from which the invention is based discloses a switch for a star-connected three-phase asynchronous motor which is in principle suitable as a machine switch for a processing table for handheld power tools ( EP 1 744 431 A2 ). This machine switch already shows a self-holding circuit for self-holding the ON position of the ON / OFF switching device. The above-described problem of "loose contact" is not addressed in this machine switch.

Der Lehre liegt somit das Problem zu Grunde, den bekannten Maschinenschalter für einen Bearbeitungstisch für Handwerkzeugmaschinen bzw. einen damit ausgerüsteten Bearbeitungstisch sicherheitstechnisch zu verbessern.The teaching is thus based on the problem of improving the safety of the known machine switch for a processing table for hand tool machines or a processing table equipped therewith.

Der erfindungsgemäße Maschinenschalter für einen Bearbeitungstisch für Handwerkzeugmaschinen, bei dem die zuvor aufgezeigte Problemstellung gelöst ist, ist Gegenstand des Anspruchs 1. Bevorzugte Ausgestaltungen und Weiterbildungen sind Gegenstand der Ansprüche 2 bis 4.The machine switch according to the invention for a processing table for hand machine tools, in which the above-indicated problem is solved, is the subject of claim 1. Preferred embodiments and further developments are subject matter of claims 2 to 4.

Erfindungsgemäß weist der Maschinenschalter eine Selbsthalteschaltung auf, die einen Stromsensor an der Phasenleitung und/oder der Nulleitung aufweist. Diese Selbsthalteschaltung ist so ausgelegt, daß das Selbsthalten der EIN-Stellung der EIN/AUS-Schalteinrichtung nicht erfolgt bzw. endet, sofern der Laststrom auf der Phasenleitung bzw. der Nulleitung unter einem bestimmten Wert liegt bzw. diesen unterschreitet. Das bedeutet, daß bei einem nicht ordentlich fixierten Handschalter der Handwerkzeugmaschine beim Drücken beispielsweise des EIN-Tasters der EIN/AUS-Schalteinrichtung die Selbsthaltung nicht in Wirkung tritt, weil der Antriebsmotor der Handwerkzeugmaschine nicht anläuft und folglich keinen Strom zieht. Der EIN-Taster springt wieder zurück, die Handwerkzeugmaschine bleibt vom Netz getrennt, eine Unfallgefahr besteht nicht. Ebenso fällt die Selbsthaltung sofort ab, sofern während der Arbeit mit der Werkzeugmaschine ein Wackelkontakt den Stromfluß kurzzeitig unterbricht.According to the invention, the machine switch has a self-holding circuit which has a current sensor on the phase line and / or the neutral line. This self-holding circuit is designed so that the self-holding the ON position of the ON / OFF switching device does not occur or ends, if the load current on the phase line or the neutral line is below a certain value or falls below. This means that in a not properly fixed hand switch of the power tool when pressing, for example, the ON button of the ON / OFF switching device latching does not take effect because the drive motor of the power tool does not start and therefore draws no electricity. The ON button jumps back, the hand tool remains disconnected from the mains, there is no risk of an accident. Likewise, the self-holding falls off immediately, if a shaking contact interrupts the current flow during work with the machine tool for a short time.

Insgesamt wird die Bedienungsperson auf den Fehler am Handschalter der Handwerkzeugmaschine aufmerksam und kann hier Abhilfe schaffen. Eine Verletzungsgefahr für die Bedienungsperson besteht nicht.Overall, the operator is aware of the error on the hand switch of the power tool and can remedy this situation. A risk of injury to the operator does not exist.

Ein Bearbeitungstisch für Handwerkzeugmaschinen, bei dem die zuvor aufgezeigte Problemstellung gelöst ist, ist mit einem Maschinenschalter gemäß einem der Ansprüche 1 bis 4 ausgerüstet. Er ist im Anspruch 5 beschrieben, Eine bevorzugte Ausgestaltung dieses Bearbeitungstisches ist Gegenstand des Anspruchs 6.A machining table for hand tool machines, in which the above-indicated problem is solved, is equipped with a machine switch according to one of claims 1 to 4. It is described in claim 5, A preferred embodiment of this editing table is the subject of claim 6.

Im folgenden wird die Erfindung anhand einer lediglich ein bevorzugtes Ausführungsbeispiel darstellenden Zeichnung näher erläutert. In der Zeichnung zeigt

Fig. 1
in einer perspektivischen Ansicht einen typischen Bearbeitungstisch für Handwerkzeugmaschinen,
Fig. 2
in einer perspektivischen Ansicht einen Maschinenschalter für einen solchen Bearbeitungstisch,
Fig. 3
die Prinzipdarstellung einer Selbsthalteschaltung an einem Maschinenschalter der in Rede stehenden Art und
Fig. 4
eine komplette Schaltungsanordnung gemäß Fig. 3.
In the following the invention will be explained in more detail with reference to a drawing showing only a preferred embodiment. In the drawing shows
Fig. 1
in a perspective view of a typical processing table for portable power tools,
Fig. 2
in a perspective view of a machine switch for such a machining table,
Fig. 3
the schematic diagram of a self-holding circuit on a machine switch of the type in question and
Fig. 4
a complete circuit according to Fig. 3 ,

In Fig. 1 dargestellt ist ein Bearbeitungstisch für Handwerkzeugmaschinen 5 mit einem Tischgestell 1, einen am Tischgestell 1 angebrachten, eine Werkstückauflagefläche 2 bildenden Werkstückträger 3, einer Anbringungsvorrichtung 4 zum ortsfesten Anbringen einer Handwerkzeugmaschine 5, insbesondere einer Handkreissäge, einer Handbohrmaschine o. dgl., und einen Maschinenschalter 6. Das dargestellte Ausführungsbeispiel zeigt die Handwerkzeugmaschine 5 als Handkreissäge mit einem den Sägeschlitz 7 im Werkstückträger 3 von unten her durchsetzenden Sägeblatt 8.In Fig. 1 shown is a processing table for hand tool 5 with a table frame 1, a mounted on the table frame 1, a workpiece support surface 2 forming workpiece carrier 3, an attachment device 4 for stationary attachment of a power tool 5, in particular a circular saw, a hand drill o. The like., And a machine switch The illustrated embodiment shows the power tool 5 as a circular saw with a saw slot 7 in the workpiece carrier 3 from below penetrating saw blade.

Der in Fig. 1 links vorne am Tischgestell 1 eingezeichnete und in Fig. 2 als solcher vergrößert dargestellte Maschinenschalter 6 zeigt zunächst einen Netzanschluß 9, hier und vorzugsweise in Form eines Netzanschlußsteckers, sowie einen Maschinenanschluß 10, hier und vorzugsweise in Form einer mit einem Deckel abgedeckten Anschlußdose. Nicht dargestellt ist ein Netzanschlußkabel zum Anschluß des Maschinenschalters 6 ans Netz und ein Maschinenanschlußkabel, mit dem die Handwerkzeugmaschine 5 an den Maschinenanschluß 10 des Maschinenschalters 6 angeschlossen wird.The in Fig. 1 left front on the table frame 1 drawn in and Fig. 2 Machine switch 6 shown enlarged as such initially shows a mains connection 9, here and preferably in the form of a mains connection plug, as well as a machine connection 10, here and preferably in the form of a cover box covered with a lid. Not shown is a power cord for connecting the machine switch 6 to the mains and a machine connection cable with which the power tool 5 is connected to the machine connection 10 of the machine switch 6.

Dargestellt ist eine manuelle EIN/AUS-Schalteinrichtung 11, die hier und bevorzugt als EIN/AUS-Drucktaster ausgeführt ist. Das Ganze sitzt in einem Schaltergehäuse 12, das mittels einer Anschraubplatte 13 am Tischgestell 1 anbringbar ist.Shown is a manual ON / OFF switching device 11, which is here and preferably designed as an ON / OFF pushbutton. The whole sits in a switch housing 12 which is attachable by means of a mounting plate 13 on the table frame 1.

Fig. 3 zeigt, daß die im Inneren des Maschinenschalters 6 vorgesehene Schaltungsanordnung zwischen dem Netzanschluß 9 und dem Maschinenanschluß 10 zumindest einen von der EIN/AUS-Schalteinrichtung 11 betätigten Schaltkontakt 14 in der Phasenleitung 15 und/oder der Nulleitung 16 und eine zumindest bei einem Schaltkontakt 14 maschinenanschlußseitig angeschlossene, zwischen Phasenleitung 15 und Nulleitung 16 geschaltete Selbsthalteschaltung 17 zum Selbsthalten der EIN-Stellung der EIN/AUS-Schalteinrichtung 11 aufweist und daß die Selbsthalteschaltung 17 einen Stromsensor 18 an der Phasenleitung 15 und/oder der Nulleitung 16 aufweist und so ausgelegt ist, daß das Selbsthalten der EIN-Stellung nicht erfolgt bzw. endet, sofern der Laststrom auf der Phasenleitung 15 bzw. der Nulleitung 16 unter einem bestimmten Wert liegt bzw. diesen unterschreitet. Fig. 3 shows that provided in the interior of the machine switch 6 circuitry between the power supply 9 and the machine terminal 10 at least one actuated by the ON / OFF switching device 11 switching contact 14 in the phase line 15 and / or the neutral line 16 and at least one switch contact 14 machine connection side connected, between phase line 15 and neutral line 16 connected self-holding circuit 17 for self-holding the ON position of the ON / OFF switching device 11 and that the self-holding circuit 17 has a current sensor 18 on the phase line 15 and / or the neutral line 16 and is designed so that the self-holding of the ON position does not take place or ends, provided that the load current on the phase line 15 or the neutral line 16 is below a certain value or falls below this value.

Man erkennt in Fig. 3 und Fig. 4 auch einen üblichen Schutzleiter 20, wie er in Deutschland sicherheitstechnisch vorgeschrieben ist.One recognizes in Fig. 3 and Fig. 4 also a conventional protective conductor 20, as it is prescribed in Germany safety.

Erfindungsgemäß ist weiter vorgesehen, daß bei einer Netzspannung von etwa 220 V bis etwa 240 V der bestimmte Wert des Laststroms für den Maschinenschalter 6 etwa 1,2 A beträgt.According to the invention it is further provided that at a mains voltage of about 220 V to about 240 V, the specific value of the load current for the machine switch 6 is about 1.2 A.

Bei dem in Fig. 3 dargestellten Ausführungsbeispiel ist der Stromsensor 18 an der Phasenleitung 15 der Schaltungsanordnung schematisch dargestellt. Demgegenüber zeigt die detaillierte Schaltungsanordnung in Fig. 4, daß dort der Stromsensor 18 Teil einer maschinenanschlußseitig in die Phasenleitung 15 eingefügten Stromwächterschaltung 19 ist.At the in Fig. 3 illustrated embodiment, the current sensor 18 is shown schematically on the phase line 15 of the circuit arrangement. In contrast, the detailed circuit arrangement in FIG Fig. 4 in that there the current sensor 18 is part of a current monitor circuit 19 inserted into the phase line 15 on the machine connection side.

Fig. 3 und Fig. 4 lassen schließlich noch eine Besonderheit der dargestellten Schaltungsanordnung erkennen, die darin besteht, daß die Selbsthalteschaltung 17 des Maschinenschalters 6 eine Unterspannungsauslösung 21 aufweist, die so ausgelegt ist, daß das Selbsthalten der EIN-Stellung nicht erfolgt oder endet, sofern die Spannung zwischen der Phasenleitung 15 und der Nulleitung 16 unter einen bestimmten Wert sinkt bzw. diesen unterschreitet. Das ist ein Kurzschlußschutz. Fig. 3 and Fig. 4 Finally, let still recognize a peculiarity of the illustrated circuit arrangement, which consists in that the self-holding circuit 17 of the machine switch 6 has an undervoltage release 21, which is designed so that the self-holding the ON position does not occur or ends, provided that the voltage between the phase line 15th and the neutral line 16 drops below or falls below a certain value. This is a short circuit protection.

Das Ergebnis der dargestellten Stromüberwachung der Phasenleitung 15 (notfalls auch oder zusätzlich der Nulleitung 16) ist, daß die Selbsthaltung mittels der Selbsthalteschaltung 17 nur dann greift, wenn der Antriebsmotor der Handwerkzeugmaschine 5 bei EIN-Betätigung der EIN/AUS-Schalteinrichtung 11 auch tatsächlich anläuft und entsprechend viel Strom zieht. Ein geringer Ruhestrom oder Fehlerstrom reicht dafür nicht aus, weil ein unterer Grenzwert vorgegeben wird. Tritt also der in der Beschreibungseinleitung erläuterte Fehlerfall (Wackelkontakt) auf, so tritt die Selbsthaltung mittels der Selbsthalteschaltung 17 einfach nicht in Wirkung, die Handwerkzeugmaschine 5 bzw. deren Antriebsmotor, insbesondere also die Handkreissäge bzw. deren Sägeaggregat läuft nicht an oder bleibt, bei zwischenzeitlichen Spannungsabfall, einfach dauerhaft stehen. Damit sind die geschilderten Gefahren für die Bedienungsperson bei den bisherigen Bearbeitungstischen für Handwerkzeugmaschinen eliminiert.The result of the current monitoring of the phase line 15 shown (if necessary, or in addition to the neutral line 16) is that the latching means of the Self-holding circuit 17 only intervenes when the drive motor of the power tool 5 actually starts at ON operation of the ON / OFF switching device 11 and draws a corresponding amount of power. A low quiescent current or residual current is not sufficient, because a lower limit is specified. Thus, if the fault explained in the introduction (faulty contact) on, so does the self-holding means of self-holding circuit 17 is not effective, the hand tool 5 or its drive motor, ie in particular the circular saw or saw unit does not start or remains, in the meantime Voltage drop, just stand permanently. Thus, the dangers described for the operator in the previous editing tables for hand tool machines are eliminated.

Gegenstand der Erfindung ist auch ein Maschinenschalter für Werkzeugmaschinen wie Kreissägemaschinen, Bohrmaschinen o. dgl. für sich mit den besonderen Merkmalen, die zuvor für den Erfindungsgemäß verwendeten Maschinenschalter im Detail beschrieben worden sind.The invention also relates to a machine switch for machine tools such as circular saws, drills o. The like. For themselves with the special features that have been previously described in detail for the machine switch used in the invention.

Claims (6)

  1. Machine switch for a machining table for hand tools,
    whereby the machine switch (6), comprises a mains connection (9), a machine connection (10) preferably in the form of a mains socket, a manually operated ON/OFF switch (11), preferably in the form of an ON/OFF push-button, and a switching arrangement and
    whereby the switching arrangement between the mains connection (9) and the machine connection (10) comprises at least one switching contact (14) actuated by the ON/OFF switch (11) in the phase line (15) and/or by the neutral line (16), and one self-locking circuit (17) connected at least on the machine connection side to a switch contact (14) for locking the ON position of the ON/OFF switch (11),
    characterised in that
    the self-locking circuit (17) is switched between the phase line (15) and the neutral line (16) and that the self-locking circuit (17) comprises a current sensor (18) at the phase line (15) and/or the neutral line (16) and is so designed that the locking of the ON position is not effected or does not end before the load current on the phase line (15) or the neutral line (16) falls below a given value.
  2. Machine switch according to Claim 1 above, characterised in that, at a mains voltage of approximately 220 V to about 240 V the given value of the load current for the machine switch (6) is in the region of 1.2 A.
  3. Machine switch according to Claim 1 or Claim 2 above, characterised in that the current sensor (18) is a part of a current monitoring circuit (19) included on the machine connection side in the phase line (15).
  4. Machine switch according to any of the Claims 1 to 3 above, characterised in that the self-locking circuit (17) of the machine switch (6) contains a low voltage circuit breaker (21) designed in such a way that the self-locking of the ON position is not effected or does not end until the voltage between the phase line (15) and the neutral line (16) lies or falls below a certain value.
  5. Machining table for hand machine tools with a table element (1), a workpiece carrier (3) in the form of a workpiece supporting surface (2), an attachment device (4) for the secure attachment of a hand machine tool (5), in particular a manually operated circular saw or a hand operated drill, and a machine switch (6), characterised by a machine switch (6) according to any of the Claims 1 to 4 above.
  6. A machining table according to Claim 5 above, characterised in that the machine switch (6) is designed to be an electrical component with a switch housing (12) and that preferably the switch housing (12) is provided with an attachment device, in particular a bolt-on plate (13) for the attachment of the table element (1) or the workpiece carrier (3).
EP08006899.2A 2007-04-25 2008-04-05 Machine switch and work table for hand tools Not-in-force EP1986211B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202007006049U DE202007006049U1 (en) 2007-04-25 2007-04-25 Machining table for hand tools and machine switches

Publications (3)

Publication Number Publication Date
EP1986211A2 EP1986211A2 (en) 2008-10-29
EP1986211A3 EP1986211A3 (en) 2009-07-22
EP1986211B1 true EP1986211B1 (en) 2015-07-15

Family

ID=39421420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08006899.2A Not-in-force EP1986211B1 (en) 2007-04-25 2008-04-05 Machine switch and work table for hand tools

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EP (1) EP1986211B1 (en)
DE (1) DE202007006049U1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008000600U1 (en) 2008-01-15 2009-05-20 Metabowerke Gmbh Machining table for hand tool machines
DE202008011969U1 (en) * 2008-09-09 2008-12-24 Scheppach Fabrikation Von Holzbearbeitungsmaschinen Gmbh circular saw
DE202017103672U1 (en) * 2017-06-21 2018-09-24 Flughafen München GmbH Electric safety switch
DE102022125817B3 (en) 2022-10-06 2024-02-01 Stark Spannsysteme Gmbh Coupling with a coupling piece and a counter-coupling piece for producing a detachable electrical connection and machine tool with such a coupling

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1193453B (en) * 1979-09-03 1988-06-22 Puntimatic Snc D Musiani Franc OVERCURRENT AND LACK OF PHASE DETECTOR DEVICE
AT364419B (en) * 1979-10-02 1981-10-27 Naimer H L COMPUTER CONTROLLED SWITCHGEAR
DE4004705A1 (en) * 1989-02-25 1990-08-30 Elektra Beckum Lubitz & Co Bench-mounted circular saw - has saw blade and saw motor mounted on swinging arm to provide height adjustment
DE4244149A1 (en) 1992-12-24 1994-06-30 Elektra Beckum Ag Workbench circular saw with electric drive motor
US6552888B2 (en) * 2001-01-22 2003-04-22 Pedro J. Weinberger Safety electrical outlet with logic control circuit
DE20212403U1 (en) 2002-08-13 2003-12-24 Metabowerke Gmbh Circular saw used as hand-held/bench circular saw or circular cross-cut or miter-box saw, comprises splitting wedge removably arranged on housing outside fixed part of saw blade protective hood via manually operated clamping mechanism
DE102005032562A1 (en) * 2005-07-11 2007-01-18 Klinger & Born Gmbh Switch for three-phase asynchronous motor

Also Published As

Publication number Publication date
DE202007006049U1 (en) 2008-08-28
EP1986211A2 (en) 2008-10-29
EP1986211A3 (en) 2009-07-22

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