EP0679476B1 - Power wrench - Google Patents

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Publication number
EP0679476B1
EP0679476B1 EP95105536A EP95105536A EP0679476B1 EP 0679476 B1 EP0679476 B1 EP 0679476B1 EP 95105536 A EP95105536 A EP 95105536A EP 95105536 A EP95105536 A EP 95105536A EP 0679476 B1 EP0679476 B1 EP 0679476B1
Authority
EP
European Patent Office
Prior art keywords
pliers
handle
electric motor
housing
switch
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.)
Expired - Lifetime
Application number
EP95105536A
Other languages
German (de)
French (fr)
Other versions
EP0679476A2 (en
EP0679476A3 (en
Inventor
Hans Undin
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.)
Weidmueller Interface GmbH and Co KG
Original Assignee
Weidmueller Interface GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weidmueller Interface GmbH and Co KG filed Critical Weidmueller Interface GmbH and Co KG
Publication of EP0679476A2 publication Critical patent/EP0679476A2/en
Publication of EP0679476A3 publication Critical patent/EP0679476A3/en
Application granted granted Critical
Publication of EP0679476B1 publication Critical patent/EP0679476B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/146—Clip clamping hand tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B25B7/126—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears with fluid drive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping
    • H01R43/0428—Power-driven hand crimping tools

Definitions

  • the invention relates to a pair of pliers according to claim 1.
  • DE 37 19 442 A1 already has a pair of pliers with a pliers housing that has a handle that is fixed to the housing, a handle that is articulated on the pliers housing, a pliers mouth that receives processing elements, a drive device that can be actuated by pivoting the applied handle to drive the processing elements, and with an electric motor that is arranged in the pliers housing known to exert a further driving force on the machining elements.
  • pliers are known from US Pat. No. 3,058,214, in which a switch is arranged on the articulated handle. This switch can also be operated using a handle.
  • US Pat. No. 5,074,142 shows pliers with a drive device which has a driven cam.
  • the invention has for its object to ensure with pliers of the type mentioned that work carried out over a long period of time does not lead to fatigue at the user.
  • the basic idea of the invention is to support the manual force function of the pliers by motor force, so that a user of the pliers no longer needs to apply the full force required for a machining operation, but only part of it, since the remaining force is greater than the electric motor is made available.
  • the electric motor is only switched on when the handle is actuated and switched off when the handle is relieved. This can also take place if the pivotable handle has not reached any of its end positions. In other words, if the handle is relieved before a machining process is completed, the electric motor also stops and is only switched on again when the handle is actuated again or moved on.
  • a corresponding switch for switching the electric motor on and off is located on the pivotable handle or on a further handle fixed to the housing.
  • the switch comes to rest in an area of the handle which is actuated by the hand when the pliers are actuated, so that the switch is only switched on and off when the handles are touched directly.
  • the switches can be actuated via handle shells which are pivotably articulated on the handle or on the additional handle. If the hand of a user grips the handle of the pliers to pivot it towards the pliers housing, the movable grip shell comes to lie between the handle and the hand of the user, being pressed against the switch and holding it on until the pliers are closed . If the pliers are to be opened again, the handle is relieved and with it the handle shell, which then leads to the opening of the switch and thus to the switching off of the electric motor.
  • the switch mentioned can only be closed at a predetermined gripping force, that is to say only when a predetermined counterforce has been reached in the pliers mouth. This is the case, for example, if there is an object to be machined in the pliers mouth and this is held by the machining elements already approached with a predetermined force. If the pliers mouth is empty, the electric motor is not switched on at all when the pliers are closed if the force to switch on the switch is preset accordingly is. To a certain extent, this helps to save electrical energy. On the other hand, the energy consumption of the electric motor depends on how forcefully the pliers are closed by the user.
  • Adjustment means can be provided for setting the predetermined grip force in order to be able to preset the grip force accordingly. The greater the preset force, the more energy the user of the pliers has to apply and the less the motor can do.
  • the pliers can be provided with a reversing switch for changing the direction of rotation of the electric motor, which can be actuated in the event that the pliers jams before reaching their final closed position.
  • the electric motor itself can be operated via a battery or a power supply unit to be connected to the pliers.
  • a battery compartment for holding one or more batteries for the electric motor is available in the pliers housing.
  • the electric motor can act directly on the machining elements, but can also transmit its force to the machining elements via the drive device.
  • the drive device is designed as a toggle lever, the joint of which is in contact with a cam disk driven by the electric motor.
  • the cam disc can be firmly seated on a helical gear which meshes with a spur gear seated with a shaft of the electric motor.
  • the toggle lever preferably acts only on one of the processing elements, while the other of the processing elements is firmly seated in the pliers mouth.
  • the stuck processing element can be, for example, a counter knife or Be counter bearing, while the adjustable machining element can be a cutting knife, a stamp, and the like.
  • a limit switch is provided which is attached to one end of a pivotable lever, the other end of which is supported on the movable processing element. If the movable processing element is moved into the jaws of the pliers, the lever is pivoted, which means that the limit switch is moved into a position in which it can be actuated by the cam disc when it assumes a position corresponding to the final closed position of the pliers Has. If the pliers are then opened by hand, namely by pivoting the hand or plier handle, the limit switch is thereby pivoted out of the above-mentioned path and closed, so that a new working cycle can now begin.
  • the pliers generally bear the reference number 1 and have a pliers housing 2, at the front end of which there is a pliers mouth 3.
  • a pliers housing 2 is designed as a handle 4 fixed to the housing, while the rear part of the pliers housing 2 is designed as a receptacle 5 in which, for example, batteries can be accommodated.
  • a pivotable handle 6 is articulated on the lower side of the pliers housing 2.
  • a first housing-fixed receptacle 7 for receiving a first processing element fixed to the housing and, opposite this, a second movable receptacle 8 for receiving a movable processing element.
  • Both machining elements can be secured by bolts in the receptacles 7,8, for which the receptacles 7,8 are provided with corresponding through bores 9.
  • the processing elements can be displaced relative to one another in order to process an object lying between them.
  • the processing elements can e.g. are cutting knives if the pliers 1 are to be used for cutting purposes, or stamps and dies if they are e.g. is a crimping tool. Machining elements can also be embossed or shaped elements.
  • a sliding guide is provided for the movable receptacle 8 within the front part of the pliers housing 2.
  • the movable receptacle 8 is integrally connected on its side facing the handle 6 to a projection 10 which extends in the direction of the handle 6 and is provided with an elongated hole 11 which extends in the same direction.
  • a pin 12 which receives a tab 13 at one end of the tab.
  • Another pin 14 projects through the opposite end of the tab and at the same time the end of the handle 6 facing the pliers housing.
  • pivotable handle 6 can be fork-shaped at its end facing the pliers housing 2, and that two tabs 13 lying one behind the other can be provided. The tabs 13 are then found at the respective ends of the pins 12 and 14.
  • a further housing-fixed pin 16 is provided, around which a spreading spring 17 is wound, which also encompasses the pins 14 and 15.
  • the spring is supported on the bearing journal 15 fixed to the housing and presses the further journal 14 upward such that the toggle lever buckles.
  • the pivotable handle 6 takes its greatest angular distance from the pliers housing 2, while the pliers mouth 3 is fully open.
  • an electric motor 18 Within the handle 4 fixed to the housing there is an electric motor 18, the longitudinal axis 19 or shaft 20 of which extends in the longitudinal direction of the pliers housing 2.
  • the rear housing part 5, in which batteries for operating the electric motor 18 can be located, can be attached to the housing-fixed handle 4 e.g. pluggable connected. Plug contacts can be present in the area of the plug-in connection in order to be able to connect the poles of the battery to the corresponding connections of the electric motor 18 in a simple manner. This will be discussed in more detail below.
  • the free end of the shaft 20 of the electric motor 18 extends in the direction of the jaws 3 and carries a spur gear 21 firmly connected to it.
  • This spur gear 21 the teeth of which lie on a conical surface symmetrically to the longitudinal axis 19, meshes with a helical gear 22, which on a Axle 23 fixed to the housing is mounted, which lies on the longitudinal axis 19 and perpendicular to it and is located above the pin 14 is located.
  • the helical gear 22 and with it the cam 24 are driven via the shaft 20 and the spur gear 21, which leads to a corresponding drive of the receptacle 8 via the toggle lever.
  • the position of the toggle lever is dependent on the shape of the cam 24, which will be discussed later.
  • This handle switch 25 is an on / off switch, the switching lug 26 of which is located on the front longitudinal side of the handle 6.
  • a handle shell 27 is also mounted on the handle 6, specifically at the handle end facing the toggle lever. For this purpose, there is a bearing pin 28 on the handle 6, which passes through the handle shell 27 laterally. The handle shell 27 can thus be pivoted a little around the bearing pin 28 relative to the handle 6, the handle shell 27 also covering the front longitudinal side of the handle 6 and thus coming to rest on the switching lug 26 of the handle switch 25.
  • the switching lug 26 is actuated and the handle switch 25 is thus closed, which leads to the electric motor 18 being switched on.
  • the switching lug 26 is biased by a spring, not shown, so that it can only be actuated and closes the switch 25 after a predetermined switching force has been applied via the grip shell 27.
  • the spring mentioned can be located within the switch 25.
  • a compression spring 29 can also be located between the inside of the. Handle shell 27 and the front of the handle 6 may be present. The force of the compression spring 29 can be changed by suitable adjusting means 29a, which are located on the outside of the grip shell 27.
  • This limit switch 30 is mounted on one end of a lever 31 which can be pivoted about an axis 32 fixed to the housing and which, with its other end projecting beyond the axis 32 fixed to the housing, on the movable end Support 8 supports.
  • the lever 31 is biased clockwise around the housing-fixed axis 32 by a tension spring 33. However, it cannot turn around the axis 32 because its other end rests on the movable receptacle 8 with a nose 34. Only when the handle 6 is pivoted in the direction of the handle 4 fixed to the housing, i.e.
  • the knee lever stretch is the nose 34 relieved, so that the lever 31 can rotate a little clockwise around the axis 32 fixed to the housing, to the extent that one Switch nose 35 of the limit switch 30 has assumed a predetermined position.
  • a stop 36 fixed to the housing can be present in the movement path of the limit switch 30. When the pliers close, the limit switch 30 abuts the stop 36 and thus positions the switching lug 35 so that it can be actuated by the cam plate 24 in the area of its greatest radial extent in order to switch off the electric motor 18.
  • the toggle lever stretches and presses the receptacle 8 into the jaws 3.
  • the receptacles 7 and 8 can carry suitable processing elements, as already mentioned. Since no opposing force acts on the processing elements in the area of the pliers jaw 3, the handle 6 can be pivot relatively easily, so with little effort, so that the force of the spring 29 is not overcome. In this case, the switch 25 is not closed, so that the electric motor 18 also does not start to run. If the handle 6 is then released, the spring 17 presses it back into the starting position.
  • the switch 25 is not actuated by the grip shell 27 until the machining elements have been moved against the object to be machined with a predetermined force. If the opposing force is now generated in the jaws 3, the handle 6 can no longer be pivoted so easily in the direction of the handle 4 fixed to the housing, so that the user has to use a stronger hand force. Now, however, the force of the compression spring 29 can be overcome, which leads to the pivoting of the handle 28 relative to the handle 6 and thus to the actuation of the switching lug 26, so that the switch 25 is now switched on, which leads to the rotation of the electric motor 18.
  • the movable processing element is now adjusted not only via the handle 6 by the force of the user but also with the help of the electric motor 18.
  • the cam disc 24 rotates clockwise and contributes to the extension of the toggle lever due to its circumferential course.
  • the toggle lever is stretched farthest when the outermost region of the cam 24 acts on the pin 14.
  • the electric motor 18 continues to rotate over a certain angular range until the outermost region of the cam disk 24 acts on the switching lug 35 and the limit switch 30 is thereby actuated, which leads to the shutdown of the electric motor 18.
  • Due to the selected shape of the cam 24, the toggle lever can now buckle again, so that the handle 6 reaches its starting position again and the pliers mouth 3 is open.
  • FIG. 2 shows a second embodiment of the pliers according to the invention.
  • This exemplary embodiment is essentially the same as the first exemplary embodiment, but here the handle 6 is angled downward at 90 °.
  • a further and housing-fixed handle 6a is provided on the lower wall area of the middle part 4 of the pliers housing 2.
  • an additional handle 6b which is fixed to the housing is provided parallel to the central part 4 of the pliers housing 2.
  • the switch 25 with the switching lug 26 is present in this parallel handle 6b, and furthermore, on the inside of this parallel handle 6b, an additional handle shell 39 is pivotably mounted relative to the handle 6b by means of an axis 38.
  • This further grip shell 39 in turn actuates the switching lug 26 when a predetermined force has been overcome, which is predetermined, for example, by a compression spring 40 which lies between the further grip shell and the handle 6b.
  • the pliers 1 according to FIG. 3 are held in operation so that the pliers mouth 3 points upwards. The fingers of a user reach into the area that lies between the middle part 4 and the further handle 6b, while the handle 6 lies in the palm of the user.
  • FIGS. 1, 2 and 3 shows the electrical circuit diagram of the pliers according to the invention according to the exemplary embodiments according to FIGS. 1, 2 and 3.
  • the electric motor 18 is electrically in series with a first switching contact of the reversing switch 37, with a battery 41, with a switching contact of the limit switch 30 (Cam switch), with a switch contact of the handle switch 25 and with a second switch contact of the reversing switch 37. In the rest position, the limit switch 30 is closed while the handle switch 25 is open.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Scissors And Nippers (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The pliers (1) have a pliers housing (2) with a relatively pivoted handgrip (6), used for operating a drive which is coupled to the operating elements associated with the pliers jaw (3) at the front end of the pliers housing. The drive is assisted by a battery-operated electric motor (18) contained within the pliers housing, with the switch (25) for operating the electric motor incorporated within the handgrip. Pref. the switch is first operated when the force applied to the handgrip reaches a threshold value. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Zange gemäß dem Patentanspruch 1.The invention relates to a pair of pliers according to claim 1.

Aus der DE 37 19 442 A1 ist bereits eine Zange mit einem einen gehäusefesten Handgriff aufweisenden Zangengehäuse, einem am Zangengehäuse angelenkten Handgriff, einem Bearbeitungselemente aufnehmenden Zangenmaul, einer durch Verschwenkung des angelegten Handgriffs betätigbaren Antriebseinrichtung zum Antreiben der Bearbeitungselemente, sowie mit einem im Zangengehäuse angeordneten Elektromotor zur Ausübung einer weiteren Antriebskraft auf die Bearbeitungselemente bekannt. Bei Verschwenken des angelenkten Handgriffs wird bei Erreichen einer voreingestellten Griffstellung zwischen diesem und dem gehäusefestenDE 37 19 442 A1 already has a pair of pliers with a pliers housing that has a handle that is fixed to the housing, a handle that is articulated on the pliers housing, a pliers mouth that receives processing elements, a drive device that can be actuated by pivoting the applied handle to drive the processing elements, and with an electric motor that is arranged in the pliers housing known to exert a further driving force on the machining elements. When the articulated handle is pivoted, a pre-set handle position is reached between it and the handle fixed to the housing

Handgriff der Elektromotor zugeschaltet. Ferner ist aus der US-PS 3 058 214 eine Zange bekannt, bei der ein Schalter am angelenkten Handgriff angeordnet ist. Dabei kann dieser Schalter auch über eine Griffschale betätigt werden.Handle of the electric motor switched on. Furthermore, pliers are known from US Pat. No. 3,058,214, in which a switch is arranged on the articulated handle. This switch can also be operated using a handle.

Aus der DE 35 27 922 A1 geht ein Handwerkzeug als bekannt hervor, bei dem ein Schalter erst bei einer vorbestimmten Griffkraft schließbar ist.From DE 35 27 922 A1 a hand tool emerges as known, in which a switch can only be closed with a predetermined grip force.

Schließlich zeigt die US-PS 5 074 142 eine Zange mit einer Antriebseinrichtung, welche eine angetriebene Kurvenscheibe aufweist.Finally, US Pat. No. 5,074,142 shows pliers with a drive device which has a driven cam.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Zange der genannten Art dafür zu sorgen, daß auch über längere Zeit mit ihr durchgeführte Arbeiten nicht zu Ermüdungserscheingungen beim Benutzer führen.The invention has for its object to ensure with pliers of the type mentioned that work carried out over a long period of time does not lead to fatigue at the user.

Die Lösung der gestellten Aufgabe ist im Patentanspruchs 1 angegeben. Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.The solution to the problem is given in claim 1. Advantageous embodiments of the invention can be found in the subclaims.

Grundgedanke der Erfindung ist die Unterstützung der Handkraft-Funktion der Zange durch Motorkraft, so daß ein Zangenbenutzer nicht mehr die volle für einen Bearbeitungsvorgang erforderliche Kraft aufzubringen braucht, sondern nur noch einen Teil davon, da die restliche Kraft über den Elektromotor zur Verfügung gestellt wird. Dabei wird der Elektromotor bei ordnungsgemäßer Verwendung der Zange nur dann eingeschaltet, wenn auch der Handgriffbetätigt wird, und ausgeschaltet, wenn der Handgriff entlastet wird. Dies kann auch dann erfolgen, wenn der verschwenkbare Handgriff keine seiner Endstellungen erreicht hat. Wird mit anderen Worten vor Abschluß eines Bearbeitungsvorganges der Handgriff entlastet, so bleibt auch der Elektromotor stehen und wird erst wieder eingeschaltet, wenn der Handgriff erneut betätigt bzw. weiterbewegt wird.The basic idea of the invention is to support the manual force function of the pliers by motor force, so that a user of the pliers no longer needs to apply the full force required for a machining operation, but only part of it, since the remaining force is greater than the electric motor is made available. When the pliers are used properly, the electric motor is only switched on when the handle is actuated and switched off when the handle is relieved. This can also take place if the pivotable handle has not reached any of its end positions. In other words, if the handle is relieved before a machining process is completed, the electric motor also stops and is only switched on again when the handle is actuated again or moved on.

Zu diesem Zweck befindet sich am verschwenkbaren Handgriff oder an einem gehäusefesten weiteren Handgriff ein entsprechender Schalter zum Ein- und Ausschalten des Elektromotors. Der Schalter kommt dabei in einem Bereich des Handgriffs zu liegen, der bei Betätigung der Zange durch die Hand beaufschlagt wird, so daß das Ein- und Ausschalten des Schalters also nur bei unmittelbarer Berührung der Handgriffe erfolgt. Nach einer besonders vorteilhaften Ausgestaltung der Erfindung sind die Schalter über Griffschalen betätigbar, die am Handgriff bzw. am weiteren Handgriff schwenkbar angelenkt sind. Umgreift die Hand eines Benutzers den Handgriff der Zange, um diesen in Richtung zum Zangengehäuse zu verschwenken, so kommt die bewegbare Griffschale zwischen Handgriff und Hand des Benutzers zu liegen, wobei sie gegen den Schalter gedrückt wird und diesen eingeschaltet hält, bis die Zange geschlossen ist. Soll die Zange wieder geöffnet werden, wird der Handgriff entlastet und damit auch die Griffschale, was dann zur Öffnung des Schalters und damit zum Abschalten des Elektromotors führt.For this purpose, a corresponding switch for switching the electric motor on and off is located on the pivotable handle or on a further handle fixed to the housing. The switch comes to rest in an area of the handle which is actuated by the hand when the pliers are actuated, so that the switch is only switched on and off when the handles are touched directly. According to a particularly advantageous embodiment of the invention, the switches can be actuated via handle shells which are pivotably articulated on the handle or on the additional handle. If the hand of a user grips the handle of the pliers to pivot it towards the pliers housing, the movable grip shell comes to lie between the handle and the hand of the user, being pressed against the switch and holding it on until the pliers are closed . If the pliers are to be opened again, the handle is relieved and with it the handle shell, which then leads to the opening of the switch and thus to the switching off of the electric motor.

Dabei ist vorgesehen, daß der genannte Schalter erst bei einer vorbestimmten Griffkraft schließbar ist, also erst dann, wenn im Zangenmaul eine vorbestimmte Gegenkraft erreicht worden ist. Dies ist z.B. dann der Fall, wenn sich im Zangenmaul ein zu bearbeitender Gegenstand befindet und dieser von den bereits angefahrenen Bearbeitungselementen mit vorbestimmter Kraft gehalten wird. Ist das Zangenmaul leer, so wird beim Schließen der Zange der Elektromotor überhaupt nicht eingeschaltet, wenn die Kraft zum Einschalten des Schalters entsprechend voreingestellt ist. Dies trägt zu einem gewissen Teil zur Einsparung elektrischer Energie bei. Andererseits hängt die Energieaufnahme des Elektromotors davon ab, wie kräftig die Zange durch den Benutzer geschlossen wird. Der Elektromotor nimmt daher in der Regel nicht die volle Energie auf, die benötigt wird, wenn er alleine das Zangenmaul bei Bearbeitung schließen müßte, so daß sich auch hier der Verbrauch an elektrischer Energie in Grenzen hält. Für die Einstellung der vorbestimmten Griffkraft können Stellmittel vorhanden sein, um die Griffkraft entsprechend voreinstellen zu können. Je größer die voreingestellte Kraft, desto mehr Energie muß der Benutzer der Zange aufbringen, und desto weniger der Motor leisten.It is provided that the switch mentioned can only be closed at a predetermined gripping force, that is to say only when a predetermined counterforce has been reached in the pliers mouth. This is the case, for example, if there is an object to be machined in the pliers mouth and this is held by the machining elements already approached with a predetermined force. If the pliers mouth is empty, the electric motor is not switched on at all when the pliers are closed if the force to switch on the switch is preset accordingly is. To a certain extent, this helps to save electrical energy. On the other hand, the energy consumption of the electric motor depends on how forcefully the pliers are closed by the user. The electric motor therefore generally does not take up the full energy that is required if it had to close the pliers mouth alone during processing, so that the consumption of electrical energy is also limited here. Adjustment means can be provided for setting the predetermined grip force in order to be able to preset the grip force accordingly. The greater the preset force, the more energy the user of the pliers has to apply and the less the motor can do.

Die Zange kann mit einem Drehrichtungsumkehrschalter zur Umschaltung der Drehrichtung des Elektromotors versehen sein, der für den Fall betätigt werden kann, daß die Zange vor Erreichen ihrer endgültigen Schließstellung festklemmt.The pliers can be provided with a reversing switch for changing the direction of rotation of the electric motor, which can be actuated in the event that the pliers jams before reaching their final closed position.

Der Elektromotor selbst kann über eine Batterie oder ein mit der Zange zu verbindendes Netzgerät betrieben werden. Für den Batteriebetrieb ist vorgesehen, im Zangengehäuse einen Batterieraum zur Aufnahme einer oder mehrerer Batterien für den Elektromotor bereitzuhalten.The electric motor itself can be operated via a battery or a power supply unit to be connected to the pliers. For battery operation, it is provided that a battery compartment for holding one or more batteries for the electric motor is available in the pliers housing.

Der Elektromotor kann direkt auf die Bearbeitungselemente einwirken, kann seine Kraft aber auch über die Antriebseinrichtung auf die Bearbeitungselemente übertragen.The electric motor can act directly on the machining elements, but can also transmit its force to the machining elements via the drive device.

Nach einer vorteilhaften Ausgestaltung der Erfindung ist die Antriebseinrichtung als Kniehebel ausgebildet, dessen Gelenk mit einer vom Elektromotor angetriebenen Kurvenscheibe in Berührung steht. Dabei kann die Kurvenscheibe fest auf einem Schrägzahnrad sitzen, das auf einem mit einer Welle des Elektromotors sitzenden Stirnzahnrad kämmt. Vorzugsweise wirkt dabei der Kniehebel nur auf eines der Bearbeitungselemente, während das andere der Bearbeitungselemente fest im Zangenmaul sitzt. Das festsitzende Bearbeitungselement kann z.B. ein Gegenmesser oder Gegenlager sein, während das verstellbare Bearbeitungselement ein Schneidmesser, ein Stempel, und dergleichen, sein kann.According to an advantageous embodiment of the invention, the drive device is designed as a toggle lever, the joint of which is in contact with a cam disk driven by the electric motor. The cam disc can be firmly seated on a helical gear which meshes with a spur gear seated with a shaft of the electric motor. The toggle lever preferably acts only on one of the processing elements, while the other of the processing elements is firmly seated in the pliers mouth. The stuck processing element can be, for example, a counter knife or Be counter bearing, while the adjustable machining element can be a cutting knife, a stamp, and the like.

Um bei Erreichen der endgültigen Zangenschließstellung den Elektromotor abzuschalten, ist ein Endabschalter vorgesehen, der an einem Ende eines verschwenkbaren Hebels befestigt ist, dessen anderes Ende sich am bewegbaren Bearbeitungselement abstützt. Wird das bewegbare Bearbeitungselement in das Zangenmaul hineingefahren, so wird der genannte Hebel verschwenkt, was dazu führt, daß der Endabschalter in eine Position bewegt wird, in der er von der Kurvenscheibe betätigt werden kann, wenn sie eine der endgültigen Schließstellung der Zange entsprechende Position eingenommen hat. Wird danach die Zange von Hand geöffnet, und zwar durch Verschwenkung des Hand- bzw. Zangengriffes, so wird der Endabschalter dadurch wieder aus der genannten Bahn herausgeschwenkt und geschlossen, so daß jetzt ein neuer Arbeitszyklus beginnen kann.In order to switch off the electric motor when the final clamp closing position is reached, a limit switch is provided which is attached to one end of a pivotable lever, the other end of which is supported on the movable processing element. If the movable processing element is moved into the jaws of the pliers, the lever is pivoted, which means that the limit switch is moved into a position in which it can be actuated by the cam disc when it assumes a position corresponding to the final closed position of the pliers Has. If the pliers are then opened by hand, namely by pivoting the hand or plier handle, the limit switch is thereby pivoted out of the above-mentioned path and closed, so that a new working cycle can now begin.

Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher beschrieben. Es zeigen:

Fig. 1
eine Zange nach einem ersten Ausführungsbeispiel der Erfindung,
Fig. 2
eine Zange nach einem zweiten Ausführungsbeispiel der Erfindung,
Fig. 3
eine Zange nach einem dritten Ausführungsbeispiel der Erfindung und
Fig. 4
eine elektrische Schaltung für die Zangen nach den Figuren 1 bis 3.
The invention is described in more detail below with reference to the drawing. Show it:
Fig. 1
pliers according to a first embodiment of the invention,
Fig. 2
pliers according to a second embodiment of the invention,
Fig. 3
a pair of pliers according to a third embodiment of the invention and
Fig. 4
an electrical circuit for the pliers according to Figures 1 to 3.

Nachfolgend wird die Zange nach dem ersten Ausführungsbeispiel der Erfindung im einzelnen beschrieben.The pliers according to the first embodiment of the invention are described in detail below.

Die Zange trägt allgemein das Bezugszeichen 1 und weist ein Zangengehäuse 2 auf, an dessen vorderem Ende sich ein Zangenmaul 3 befindet. Der Mittelteil des Zangengehäuses 2 ist als gehäusefester Handgriff 4 ausgebildet, während der hintere Teil des Zangengehäuses 2 als Aufnahme 5 ausgebildet ist, in der sich z.B. Batterien unterbringen lassen. Im Bereich zwischen dem vorderen Ende des gehäusefesten Handgriffes 4 und dem Zangenmaul 3 ist an der unteren Seite des Zangengehäuses 2 ein verschwenkbarer Handgriff 6 angelenkt.The pliers generally bear the reference number 1 and have a pliers housing 2, at the front end of which there is a pliers mouth 3. Of the The middle part of the pliers housing 2 is designed as a handle 4 fixed to the housing, while the rear part of the pliers housing 2 is designed as a receptacle 5 in which, for example, batteries can be accommodated. In the area between the front end of the handle 4 fixed to the housing and the pliers mouth 3, a pivotable handle 6 is articulated on the lower side of the pliers housing 2.

Im Zangenmaul 3 befindet sich eine erste gehäusefeste Aufnahme 7 zur Aufnahme eines ersten gehäusefesten Bearbeitungselements sowie dieser gegenüberliegend eine zweite bewegliche Aufnahme 8 zur Aufnahme eines beweglichen Bearbeitungselements. Beide Bearbeitungselemente lassen sich durch Bolzen in den Aufnahmen 7,8 sichern, wozu die Aufnahmen 7,8 mit entsprechenden Durchgangsbohrungen 9 versehen sind. Durch Verschiebung der beweglichen Aufnahme 8 relativ zur gehäusefesten Aufnahme 7 können die Bearbeitungselemente gegeneinander verschoben werden, um einen zwischen ihnen liegenden Gegenstand zu bearbeiten. Bei den Bearbeitungselementen kann es sich z.B. um Schneidmesser handeln, wenn die Zange 1 zu Schneidzwecken verwendet werden soll, oder um Stempel und Gesenk, wenn es sich z.B. um eine Crimpzange handelt. Auch können Bearbeitungselemente Präge- oder Formelemente sein.In the pliers jaw 3 there is a first housing-fixed receptacle 7 for receiving a first processing element fixed to the housing and, opposite this, a second movable receptacle 8 for receiving a movable processing element. Both machining elements can be secured by bolts in the receptacles 7,8, for which the receptacles 7,8 are provided with corresponding through bores 9. By moving the movable receptacle 8 relative to the receptacle 7 fixed to the housing, the processing elements can be displaced relative to one another in order to process an object lying between them. The processing elements can e.g. are cutting knives if the pliers 1 are to be used for cutting purposes, or stamps and dies if they are e.g. is a crimping tool. Machining elements can also be embossed or shaped elements.

Für die bewegliche Aufnahme 8 ist innerhalb des vorderen Teils des Zangengehäuses 2 eine nicht dargestellte Gleitführung vorgesehen. Andererseits ist die bewegliche Aufnahme 8 an ihrer zum Handgriff 6 weisenden Seite einstückig mit einem Ansatz 10 verbunden, der sich in Richtung zum Handgriff 6 erstreckt und mit einem sich in derselben Richtung erstreckenden Langloch 11 versehen ist. In dieses Langloch 11 hinein ragt ein Zapfen 12, der eine Lasche 13 an einem Laschenende aufnimmt. Ein weiterer Zapfen 14 durchragt das gegenüberliegende Laschenende sowie gleichzeitig das dem Zangengehäuse zugewandte Ende des Handgriffs 6. Im Abstand zu diesem weiteren Zapfen 14 sowie in Richtung des freien Endes des Handgriffs 6 gesehen, befindet sich ein gehäusefester Lagerzapfen 15, um den herum der verschwenkbare Handgriff 6 drehbar gelagert ist. Die Lasche 13 und der zwischen den Zapfen 14 und 15 vorhandene Abschnitt des Handgriffs 6 bilden somit einen Kniehebel, dessen Gelenk der weitere Zapfen 14 ist.A sliding guide, not shown, is provided for the movable receptacle 8 within the front part of the pliers housing 2. On the other hand, the movable receptacle 8 is integrally connected on its side facing the handle 6 to a projection 10 which extends in the direction of the handle 6 and is provided with an elongated hole 11 which extends in the same direction. In this elongated hole 11 protrudes a pin 12 which receives a tab 13 at one end of the tab. Another pin 14 projects through the opposite end of the tab and at the same time the end of the handle 6 facing the pliers housing. At a distance from this additional pin 14 and in the direction of the free end of the handle 6, there is a bearing pin 15 which is fixed to the housing and around which the pivotable handle 6 is rotatably mounted. The tab 13 and the portion present between the pins 14 and 15 of the handle 6 thus form a toggle lever, the joint of which is the further pin 14.

Es sei darauf hingewiesen, daß der verschwenkbare Handgriff 6 an seinem dem Zangengehäuse 2 zugewandten Ende gabelförmig ausgebildet sein kann, und daß zwei parallel hintereinanderliegende Laschen 13 vorgesehen sein können. Die Laschen 13 finden sich dann an den jeweiligen Enden der Zapfen 12 und 14.It should be pointed out that the pivotable handle 6 can be fork-shaped at its end facing the pliers housing 2, and that two tabs 13 lying one behind the other can be provided. The tabs 13 are then found at the respective ends of the pins 12 and 14.

Um die Zange 1 im Ruhezustand geöffnet zu halten, ist ein weiterer gehäusefester Zapfen 16 vorgesehen, um den herum eine sich spreizende Feder 17 gewickelt ist, die auch die Zapfen 14 und 15 umgreift. Die Feder stützt sich dabei am gehäusefesten Lagerzapfen 15 ab und drückt den weiteren Zapfen 14 so nach oben, daß der Kniehebel einknickt. Dadurch nimmt der verschwenkbare Handgriff 6 seinen größten Winkelabstand vom Zangengehäuse 2 ein, während das Zangenmaul 3 vollständig geöffnet ist.In order to keep the pliers 1 open in the idle state, a further housing-fixed pin 16 is provided, around which a spreading spring 17 is wound, which also encompasses the pins 14 and 15. The spring is supported on the bearing journal 15 fixed to the housing and presses the further journal 14 upward such that the toggle lever buckles. As a result, the pivotable handle 6 takes its greatest angular distance from the pliers housing 2, while the pliers mouth 3 is fully open.

Innerhalb des gehäusefesten Handgriffs 4 befindet sich ein Elektromotor 18, dessen Längsachse 19 bzw. Welle 20 in Längsrichtung des Zangengehäuses 2 verläuft. Das hintere Gehäuseteil 5, in welchem sich Batterien zum Betrieb des Elektromotors 18 befinden können, ist mit dem gehäusefesten Handgriff 4 z.B. steckbar verbunden. Im Bereich der Steckverbindung können Steckkontakte vorhanden sein, um die Pole der Batterie in einfacher Weise mit den entsprechenden Anschlüssen des Elektromotors 18 verschalten zu können. Hierauf wird weiter unten näher eingegangen.Within the handle 4 fixed to the housing there is an electric motor 18, the longitudinal axis 19 or shaft 20 of which extends in the longitudinal direction of the pliers housing 2. The rear housing part 5, in which batteries for operating the electric motor 18 can be located, can be attached to the housing-fixed handle 4 e.g. pluggable connected. Plug contacts can be present in the area of the plug-in connection in order to be able to connect the poles of the battery to the corresponding connections of the electric motor 18 in a simple manner. This will be discussed in more detail below.

Das freie Ende der Welle 20 des Elektromotors 18 erstreckt sich in Richtung zum Zangenmaul 3 und trägt fest mit ihm verbunden ein Stirnzahnrad 21. Dieses Stirnzahnrad 21, dessen Zähne auf einer Kegelfläche symmetrisch zur Längsachse 19 liegen, kämmt mit einem Schrägzahnrad 22 , das auf einer gehäusefesten Achse 23 gelagert ist, welche auf der Längsachse 19 und senkrecht zu dieser liegt und sich oberhalb des Zapfens 14 befindet. An einer Seite des Schrägzahnrades 22 befindet sich fest mit diesem verbunden eine Kurvenscheibe 24, die ebenfalls auf der Achse 23 gelagert ist. Die Kurvenscheibe 24 kommt in Berührung mit dem weiteren Zapfen 14 des Kniehebels, so daß bei Drehung der Kurvenscheibe 24 die Stellung des Kniehebels eingestellt werden kann. Dreht sich also der Elektromotor 18, so wird über die Welle 20 und das Stirnzahnrad 21 das Schrägzahnrad 22 und mit ihm die Kurvenscheibe 24 angetrieben, was zu einem entsprechenden Antrieb der Aufnahme 8 über den Kniehebel führt. Die Stellung des Kniehebels ist dabei allerdings von der Form der Kurvenscheibe 24 abhängig, worauf noch eingegangen wird.The free end of the shaft 20 of the electric motor 18 extends in the direction of the jaws 3 and carries a spur gear 21 firmly connected to it. This spur gear 21, the teeth of which lie on a conical surface symmetrically to the longitudinal axis 19, meshes with a helical gear 22, which on a Axle 23 fixed to the housing is mounted, which lies on the longitudinal axis 19 and perpendicular to it and is located above the pin 14 is located. On one side of the helical gear 22 there is a cam 24, which is also connected to the shaft 23 and is also mounted on the axis 23. The cam plate 24 comes into contact with the further pin 14 of the toggle lever, so that the position of the toggle lever can be adjusted when the cam plate 24 rotates. If the electric motor 18 rotates, the helical gear 22 and with it the cam 24 are driven via the shaft 20 and the spur gear 21, which leads to a corresponding drive of the receptacle 8 via the toggle lever. The position of the toggle lever is dependent on the shape of the cam 24, which will be discussed later.

Um den Elektromotor 18 einschalten zu können, befindet sich im schwenkbaren Handgriff 6 ein Griffschalter 25. Dieser Griffschalter 25 ist ein Ein/Ausschalter, dessen Schaltnase 26 an der vorderen Längsseite des Handgriffs 6 liegt. Auf dem Handgriff 6 ist ferner eine Griffschale 27 gelagert, und zwar an dem dem Kniehebel zugewandeten Handgriffende. Hierzu befindet sich ein Lagerzapfen 28 am Handgriff 6, der die Griffschale 27 seitlich durchsetzt. Die Griffschale 27 kann somit um den Lagerzapfen 28 relativ zum Handgriff 6 ein wenig verschwenkt werden, wobei auch die Griffschale 27 die vordere Längsseite des Handgriffs 6 abdeckt und somit auf der Schaltnase 26 des Griffschalters 25 zu liegen kommt. Wird mit anderen Worten die Griffschale 25 entgegen dem Uhrzeigersinn um den Lagerzapfen 28 relativ zum Handgriff 6 verschwenkt, so wird die Schaltnase 26 betätigt und damit der Griffschalter 25 geschlossen, was zum Einschalten des Elektromotors 18 führt. Vorzugsweise ist dabei aber die Schaltnase 26 durch eine nicht dargestellte Feder so vorgespannt, daß sie erst dann betätigt werden kann und den Schalter 25 schließt, nachdem eine vorbestimmte Schaltkraft über die Griffschale 27 aufgebracht worden ist. Die genannte Feder kann sich innerhalb des Schalters 25 befinden. Statt dieser Feder kann aber auch eine Druckfeder 29 zwischen der Innenseite der. Griffschale 27 und der Vorderseite des Handgriffs 6 vorhanden sein. Die Kraft der Druckfeder 29 kann durch geeignete Stellmittel 29a verändert werden, die sich außen an der Griffschale 27 befinden.In order to be able to switch on the electric motor 18, there is a handle switch 25 in the pivotable handle 6. This handle switch 25 is an on / off switch, the switching lug 26 of which is located on the front longitudinal side of the handle 6. A handle shell 27 is also mounted on the handle 6, specifically at the handle end facing the toggle lever. For this purpose, there is a bearing pin 28 on the handle 6, which passes through the handle shell 27 laterally. The handle shell 27 can thus be pivoted a little around the bearing pin 28 relative to the handle 6, the handle shell 27 also covering the front longitudinal side of the handle 6 and thus coming to rest on the switching lug 26 of the handle switch 25. In other words, if the handle shell 25 is pivoted counterclockwise around the bearing pin 28 relative to the handle 6, the switching lug 26 is actuated and the handle switch 25 is thus closed, which leads to the electric motor 18 being switched on. Preferably, however, the switching lug 26 is biased by a spring, not shown, so that it can only be actuated and closes the switch 25 after a predetermined switching force has been applied via the grip shell 27. The spring mentioned can be located within the switch 25. Instead of this spring, however, a compression spring 29 can also be located between the inside of the. Handle shell 27 and the front of the handle 6 may be present. The force of the compression spring 29 can be changed by suitable adjusting means 29a, which are located on the outside of the grip shell 27.

Am Umfang der Kurvenscheibe 24 befindet sich darüber hinaus noch ein Endabschalter 30. Dieser Endabschalter 30 ist an einem Ende eines Hebels 31 montiert, der um eine gehäusefeste Achse 32 schwenkbar ist, und der sich mit seinem die gehäusefeste Achse 32 überragenden anderen Ende an der beweglichen Aufnahme 8 abstützt. Dabei ist der Hebel 31 durch eine Zugfeder 33 im Uhrzeigersinn um die gehäusefeste Achse 32 herum vorgespannt. Er kann sichjedoch nicht um die Achse 32 herumdrehen, da sein genanntes anderes Ende mit einer Nase 34 auf der beweglichen Aufnahme 8 ruht. Erst wenn der Handgriff 6 in Richtung zum gehäusefesten Handgriff 4 verschwenkt wird, sich also der Kniehebel streckt, wird die Nase 34 entlastet, so daß sich der Hebel 31 um die gehäusefeste Achse 32 im Uhrzeigersinn ein wenig herumdrehen kann, und zwar soweit, bis eine Schaltnase 35 des Endabschalters 30 eine vorbestimmte Position eingenommen hat. Hierzu kann ein gehäusefester Anschlag 36 in der Bewegungsbahn des Endabschalters 30 vorhanden sein. Bei sich schließender Zange stößt der Endabschalter 30 gegen den Anschlag 36 und positioniert somit die Schaltnase 35, so daß diese durch die Kurvenscheibe 24 im Bereich ihrer größten radialen Erstreckung betätigt werden kann, um den Elektromotor 18 abzuschalten.On the circumference of the cam 24 there is also a limit switch 30. This limit switch 30 is mounted on one end of a lever 31 which can be pivoted about an axis 32 fixed to the housing and which, with its other end projecting beyond the axis 32 fixed to the housing, on the movable end Support 8 supports. The lever 31 is biased clockwise around the housing-fixed axis 32 by a tension spring 33. However, it cannot turn around the axis 32 because its other end rests on the movable receptacle 8 with a nose 34. Only when the handle 6 is pivoted in the direction of the handle 4 fixed to the housing, i.e. does the knee lever stretch, is the nose 34 relieved, so that the lever 31 can rotate a little clockwise around the axis 32 fixed to the housing, to the extent that one Switch nose 35 of the limit switch 30 has assumed a predetermined position. For this purpose, a stop 36 fixed to the housing can be present in the movement path of the limit switch 30. When the pliers close, the limit switch 30 abuts the stop 36 and thus positions the switching lug 35 so that it can be actuated by the cam plate 24 in the area of its greatest radial extent in order to switch off the electric motor 18.

Sollte aus irgendwelchen Gründen die Zange 1 nicht ganz geschlossen werden können, so kann die Drehrichtung des Elektromotors 18 mit Hilfe eines Drehrichtungsumkehrschalters 37 umgekehrt werden, der sich im Bereich des gehäusefesten Handgriffes 4 befindet.If, for any reason, the pliers 1 cannot be fully closed, the direction of rotation of the electric motor 18 can be reversed with the aid of a reversing switch 37 which is located in the area of the handle 4 fixed to the housing.

Nachfolgend wird der Betrieb der erfindungsgemäßen Zange näher erläutert. Zunächst sei angenommen, daß sich kein zu bearbeitender Gegenstand im Zangenmaul 3 befindet.The operation of the pliers according to the invention is explained in more detail below. First of all, it is assumed that there is no object to be processed in the jaws 3.

Wird jetzt der Handgriff 6 in die Stellung 6' überführt, so streckt sich der Kniehebel und drückt dabei die Aufnahme 8 in das Zangenmaul 3 hinein. Die Aufnahmen 7 und 8 können dabei geeignete Bearbeitungselemente tragen, wie bereits erwähnt. Da im Bereich des Zangenmauls 3 keine Gegenkraft auf die Bearbeitungselemente wirkt, läßt sich der Handgriff 6 relativ leicht verschwenken, also mit geringem Kraftaufwand, so daß die Kraft der Feder 29 nicht überwunden wird. In diesem Fall wird der Schalter 25 nicht geschlossen, so daß auch der Elektromotor 18 nicht zu laufen beginnt. Wird danach der Handgriff 6 losgelassen, so drückt die Feder 17 diesen wieder in die Ausgangslage zurück.If the handle 6 is now moved to the position 6 ', the toggle lever stretches and presses the receptacle 8 into the jaws 3. The receptacles 7 and 8 can carry suitable processing elements, as already mentioned. Since no opposing force acts on the processing elements in the area of the pliers jaw 3, the handle 6 can be pivot relatively easily, so with little effort, so that the force of the spring 29 is not overcome. In this case, the switch 25 is not closed, so that the electric motor 18 also does not start to run. If the handle 6 is then released, the spring 17 presses it back into the starting position.

Befindet sich dagegen ein zu bearbeitender Gegenstand im Zangenmaul 3, so wird der Schalter 25 durch die Griffschale 27 solange nicht betätigt, bis die Bearbeitungselemente mit vorbestimmter Kraft gegen den zu bearbeitenden Gegenstand gefahren worden sind. Wird jetzt die Gegenkraft im Zangenmaul 3 erzeugt, läßt sich der Handgriff 6 nicht mehr so leicht in Richtung zum gehäusefesten Handgriff 4 verschwenken, so daß der Benutzer eine stärkere Handkraft aufwenden muß. Jetzt aber kann die Kraft der Druckfeder 29 überwunden werden, was zur Verschwenkung der Griffschale 28 relativ zum Handgriff 6 führt und damit zur Betätigung der Schaltnase 26, so daß nunmehr der Schalter 25 eingeschaltet wird, was zur Drehung des Elektromotors 18 führt. Bei weiterer Betätigung des Handgriffs 6 wird jetzt das bewegbare Bearbeitungselement nicht nur über den Handgriff 6 durch die Kraft des Benutzers sondern auch mit Hilfe des Elektromotors 18 verstellt. Dabei dreht sich die Kurvenscheibe 24 im Uhrzeigersinn und trägt aufgrund ihres Umfangsverlaufs zur Streckung des Kniehebels bei. Der Kniehebel ist am weitesten gestreckt, wenn der am weitesten außen liegende Bereich der Kurvenscheibe 24 den Zapfen 14 beaufschlagt. Danach dreht sich der Elektromotor 18 noch über einen gewissen Winkelbereich weiter, bis der am weitesten außen liegende Bereich der Kurvenscheibe 24 die Schaltnase 35 beaufschlagt und dadurch der Endabschalter 30 betätigt wird, was zur Stillsetzung des Elektromotors 18 führt. Aufgrund der gewählten Form der Kurvenscheibe 24 kann jetzt der Kniehebel wieder einknicken, so daß der Handgriff 6 wieder seine Ausgangsstellung erreicht und das Zangenmaul 3 offen ist. Bei der Rückführung des Handgriffes 6 in seine Ausgangsstellung wird der Hebel 31 entgegen dem Uhrzeigersinn um die Achse 32 gedreht, so daß der Endabschalter 30 sich wieder vom Anschlag 36 entfernt und die Schaltnase 35 freikommt. Der Endabschalter 30 wird dann wieder geschlossen. Der Elektromotor 18 bleibt aber stillgesetzt, da hierbei auch die Griffschale 27 entlastet ist und somit der Griffschalter 25 offen ist.If, on the other hand, there is an object to be machined in the jaws 3, the switch 25 is not actuated by the grip shell 27 until the machining elements have been moved against the object to be machined with a predetermined force. If the opposing force is now generated in the jaws 3, the handle 6 can no longer be pivoted so easily in the direction of the handle 4 fixed to the housing, so that the user has to use a stronger hand force. Now, however, the force of the compression spring 29 can be overcome, which leads to the pivoting of the handle 28 relative to the handle 6 and thus to the actuation of the switching lug 26, so that the switch 25 is now switched on, which leads to the rotation of the electric motor 18. Upon further actuation of the handle 6, the movable processing element is now adjusted not only via the handle 6 by the force of the user but also with the help of the electric motor 18. The cam disc 24 rotates clockwise and contributes to the extension of the toggle lever due to its circumferential course. The toggle lever is stretched farthest when the outermost region of the cam 24 acts on the pin 14. Thereafter, the electric motor 18 continues to rotate over a certain angular range until the outermost region of the cam disk 24 acts on the switching lug 35 and the limit switch 30 is thereby actuated, which leads to the shutdown of the electric motor 18. Due to the selected shape of the cam 24, the toggle lever can now buckle again, so that the handle 6 reaches its starting position again and the pliers mouth 3 is open. When the handle 6 is returned to its initial position, the lever 31 is rotated counterclockwise about the axis 32, so that the limit switch 30 moves away from the stop 36 and the switching lug 35 is released. The limit switch 30 is then closed again. The electric motor 18 remains stopped, however, since the grip 27 is also relieved and the grip switch 25 is thus open.

Die Fig. 2 zeigt ein zweites Ausführungsbeispiel der erfindungsgemäßen Zange. Dieses Ausführungsbeispiel gleicht im wesentlichen dem ersten Ausführungsbeispiel, jedoch ist hier der Handgriff 6 unter 90° nach unten abgewinkelt. Ferner ist am unteren Wandbereich des Mittelteils 4 des Zangengehäuses 2 ein weiterer und gehäusefester Handgriff 6a vorgesehen.2 shows a second embodiment of the pliers according to the invention. This exemplary embodiment is essentially the same as the first exemplary embodiment, but here the handle 6 is angled downward at 90 °. Furthermore, a further and housing-fixed handle 6a is provided on the lower wall area of the middle part 4 of the pliers housing 2.

Bei einem dritten Ausführungsbeispiel nach Fig. 3 ist neben dem bereits erwähnten Handgriff 6 ein zusätzlicher gehäusefester Handgriff 6b parallel zum Mittelteil 4 des Zangengehäuses 2 vorhanden. Der Schalter 25 mit der Schaltnase 26 ist hier in diesem parallelen Handgriff 6b vorhanden, wobei ferner an der Innenseite dieses parallelen Handgriffes 6b mittels einer Achse 38 eine weitere Griffschale 39 relativ zum Handgriff 6b verschwenkbar gelagert ist. Durch diese weitere Griffschale 39 wird wiederum die Schaltnase 26 betätigt, wenn eine vorbestimmte Kraft überwunden worden ist, die beispielsweise durch eine Druckfeder 40 vorgegeben wird, die zwischen der weiteren Griffschale und dem Handgriff 6b liegt. Die Zange 1 gemäß Fig. 3 wird im Betrieb so gehalten, daß das Zangenmaul 3 nach oben weist. Dabei greifen die Finger eines Benutzers in den Bereich, der zwischen dem Mittelteil 4 und dem weiteren Griff 6b liegt, während der Handgriff 6 in der Handfläche des Benutzers liegt.In a third exemplary embodiment according to FIG. 3, in addition to the handle 6 already mentioned, an additional handle 6b which is fixed to the housing is provided parallel to the central part 4 of the pliers housing 2. The switch 25 with the switching lug 26 is present in this parallel handle 6b, and furthermore, on the inside of this parallel handle 6b, an additional handle shell 39 is pivotably mounted relative to the handle 6b by means of an axis 38. This further grip shell 39 in turn actuates the switching lug 26 when a predetermined force has been overcome, which is predetermined, for example, by a compression spring 40 which lies between the further grip shell and the handle 6b. The pliers 1 according to FIG. 3 are held in operation so that the pliers mouth 3 points upwards. The fingers of a user reach into the area that lies between the middle part 4 and the further handle 6b, while the handle 6 lies in the palm of the user.

Die Fig. 4 zeigt das elektrische Schaltungsdiagramm der erfindungsgemäßen Zange gemäß den Ausführungsbeispielen nach den Figuren 1, 2 und 3. Der Elektromotor 18 liegt dabei elektrisch in Reihe mit einem ersten Schaltkontakt des Drehrichtungsumkehrschalters 37, mit einer Batterie 41, mit einem Schaltkontakt des Endabschalters 30 (Nockenschalter), mit einem Schaltkontakt des Griffschalters 25 sowie mit einem zweiten Schaltkontakt des Drehrichtungsumkehrschalters 37. In Ruhestellung ist der Endabschalter 30 geschlossen, während der Griffschalter 25 geöffnet ist.4 shows the electrical circuit diagram of the pliers according to the invention according to the exemplary embodiments according to FIGS. 1, 2 and 3. The electric motor 18 is electrically in series with a first switching contact of the reversing switch 37, with a battery 41, with a switching contact of the limit switch 30 (Cam switch), with a switch contact of the handle switch 25 and with a second switch contact of the reversing switch 37. In the rest position, the limit switch 30 is closed while the handle switch 25 is open.

Claims (13)

  1. Pliers (1), comprising
    - a pliers housing (2),
    - a handle (6) which is articulated on the pliers housing (2),
    - a handle (4) which is fixed to the housing,
    - a pliers mouth (3) which accommodates processing elements,
    - a drive device (6, 14, 13, 12, 11, 10), which can be operated by pivoting the articulated handle (6), for exerting a drive force on the processing elements,
    - an electic motor (18), arranged in the pliers housing (2), for exerting a further drive force on the processing elements, and
    - a switch (25) which is arranged on a handle and with which the electric motor (18) is switched on when the articulated handle (6) is pivoted and a preset gripping force is exceeded.
  2. Pliers according to Claim 1, characterized in that the switch (25) for switching on the electric motor (18) is arranged on the articulated handle (6).
  3. Pliers according to Claim 1, characterized in that the switch (25) for switching on the electric motor (18) is arranged on a further handle (6b), which is fixed to the housing.
  4. Pliers according to Claim 2 or 3, characterized in that the switches (25) can be operated via pistol grips (27, 39) which are articulated on the articulated handle (6) and on the further handle (6b), fixed to the housing, respectively, such that they can pivot.
  5. Pliers according to Claim 4, characterized in that the switches (25) cannot be closed until a predetermined gripping force is exerted.
  6. Pliers according to one of Claims 1 to 5, characterized in that the electric motor (18) acts on the processing elements via the drive device (6, 14, 13, 12, 11, 10).
  7. Pliers according to Claim 6, characterized in that the drive device is designed as a toggle lever (13, 6) whose joint (14) is in contact with a cam disc (24) which is driven by the electric motor (18).
  8. Pliers according to Claim 7, characterized in that the cam disc (24) is firmly seated on a bevel gear (22) which engages with a spur gear (21) which is seated on a shaft (20) of the electric motor (18).
  9. Pliers according to Claim 7 or 8, characterized in that the toggle lever (13, 6) acts on only one of the processing elements, while the other is firmly seated in the pliers mouth (3).
  10. Pliers according to Claim 7, 8 or 9, characterized in that a limit turn-off switch (30) is attached to one end of a lever (31), which can pivot, in order to turn off the electric motor (18), the other end of which lever (31) is supported on the movable processing element.
  11. Pliers according to one of Claims 1 to 10, characterized in that the pliers have a rotation direction reversing switch (37) in order to reverse the rotation direction of the electric motor (18).
  12. Pliers according to one of Claims 1 to 11, characterized in that the pliers have a battery compartment (5) for accommodating a battery (41).
  13. Pliers according to Claim 5, characterized in that the predetermined gripping force can be adjusted by adjusting means (29a).
EP95105536A 1994-04-28 1995-04-12 Power wrench Expired - Lifetime EP0679476B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4414967 1994-04-28
DE4414967A DE4414967C2 (en) 1994-04-28 1994-04-28 Servo gun

Publications (3)

Publication Number Publication Date
EP0679476A2 EP0679476A2 (en) 1995-11-02
EP0679476A3 EP0679476A3 (en) 1995-11-15
EP0679476B1 true EP0679476B1 (en) 1997-10-22

Family

ID=6516747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105536A Expired - Lifetime EP0679476B1 (en) 1994-04-28 1995-04-12 Power wrench

Country Status (4)

Country Link
US (2) US5735353A (en)
EP (1) EP0679476B1 (en)
AT (1) ATE159446T1 (en)
DE (2) DE4414967C2 (en)

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KR101059620B1 (en) 2006-08-25 2011-08-25 한스 외티커 아게 마쉬넨-운트 아파라테파브리크 Manually operated pliers with force monitoring
WO2014009363A1 (en) 2012-07-10 2014-01-16 Gustav Klauke Gmbh Pressing tool
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WO2014009363A1 (en) 2012-07-10 2014-01-16 Gustav Klauke Gmbh Pressing tool
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US9993885B2 (en) 2012-07-10 2018-06-12 Gustav Klauke Gmbh Pressing tool
DE102014100348A1 (en) 2013-07-09 2015-01-15 Gustav Klauke Gmbh press tool

Also Published As

Publication number Publication date
US5735353A (en) 1998-04-07
EP0679476A2 (en) 1995-11-02
DE4414967C2 (en) 1997-07-17
US5758729A (en) 1998-06-02
DE59500828D1 (en) 1997-11-27
DE4414967A1 (en) 1995-11-02
EP0679476A3 (en) 1995-11-15
ATE159446T1 (en) 1997-11-15

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