EP3614507A1 - Pressing or crimping tool - Google Patents

Abstract

The invention relates to a pressing or crimping tool (1). The crimping or crimping pliers (1) have a fixed pliers jaw (4) and a movable pliers jaw (6). A closing movement of the movable pliers jaw (6) can be brought about by pivoting a movable hand lever (9) via a toggle lever drive (11). According to the invention, a further lever (48), in particular in the form of an additional hand lever (49), is provided. The further lever (48) is coupled to the movable pliers jaw (6) in such a way that an opening movement of the pliers jaw (6) into an insertion and / or removal position can be brought about by pivoting the further lever (48).

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a pressing or crimping tool. A pressing or crimping tool can be used to crimp or crimp a workpiece using a manual actuation of hand levers.

• Kabelschuhe nach DIN 4623,
• Aluminiumverbinder nach DIN 46329
• Aluminium-Presskabelschuhe nach DIN 48201
• Quetschkabelschuhe nach DIN 46234,
• Stiftkabelschuhe nach DIN 46230 oder
• Verbinder, Stecker oder Kabelschuhe für eine Verbindung mit einem Kabel oder Leiter, wie diese in dem Produktkatalog der WEZAG GmbH Werkzeugfabrik "Werkzeuge für die professionelle Anwendung" mit der Veröffentlichungs-Nr. 10/11 beschrieben sind,

vercrimpt werden. Bei dem hergestellten Crimp kann es sich beispielsweise für einen geschlossenen Crimp um einen Sechskant- oder Hexagonalcrimp, einen Vierkantcrimp, einen B-Crimp, einen Trapezcrimp, einen modifizierten Trapezcrimp, einen Ovalcrimp, einen Dorncrimp oder einen Zweidorncrimp handeln. Ein offener Crimp kann bspw. als V-Crimp oder B-Crimp, als Rollcrimp oder als Doppelrollcrimp ausgebildet sein.Here, crimping pliers are used in particular to produce a permanent mechanical connection and electrical contact. This is preferably done by crimping a plug with a cable or an electrical conductor of any type. Depending on the profile of the dies used, different crimping processes can be carried out with the crimping tool. For example, it can be a closed crimp, in which the conductor is inserted into a closed crimp zone of a plug or into a closed sleeve and is crimped by plastic deformation of the crimp zone or the sleeve. However, it is also possible for an open crimp to be produced in which the plug has an open crimp zone in which the conductor can be inserted from above. To name just a few examples that do not limit the invention, workpieces such as

• Cable lugs according to DIN 4623,
• Aluminum connector according to DIN 46329
• Aluminum compression cable lugs according to DIN 48201
• Crimp cable lugs to DIN 46234,
• Pin cable lugs according to DIN 46230 or
• Connectors, plugs or cable lugs for a connection with a cable or conductor, such as those in the product catalog of WEZAG GmbH tool factory "Tools for professional use" with the publication no. 10/11 are described

be crimped. The crimp produced can, for example, be a hexagonal or hexagonal crimp, a square crimp, a B crimp, a trapezoidal crimp, a modified trapezoidal crimp, an oval crimp, a mandrel crimp or a two-mandrel crimp. An open crimp can be designed, for example, as a V-crimp or B-crimp, as a roll crimp or as a double roll crimp.

• zur Ausgestaltung einer gattungsgemäßen Crimpzange,
• zu möglichen Einsatzbereichen der gattungsgemäßen Crimpzange und/oder
• zu unterschiedlichen möglichen Typen von Crimpverbindungen, welche mittels der gattungsgemäßen Crimpzange hergestellt werden können,

wird auf das Werk

• " Crimptechnik, Herstellung prozesssicherer Verbindungen von elektrischen Leitern und Steckern" der WEZAG GmbH Werkzeugfabrik, Die Bibliothek der Technik 342, Verlag Moderne Industrie, ISBN 978-3-68236-027-7

verwiesen. Gattungsgemäße Crimpzangen in unterschiedlichen Bauformen sind beispielsweise aus den Druckschriften DE 37 08 727 C2 , DE 197 13 580 C2 , DE 197 53 436 C2 , DE 198 02 287 C1 , DE 198 07 737 C2 , EP 3 208 044 A1 und EP 2 305 428 A1 bekannt.In addition to establishing the electrical connection between the cable or conductor and plug, a mechanical connection can be established using a so-called insulation crimp. A closed insulation crimp or an open insulation crimp (in particular V-crimp or B-crimp, O-crimp or OV-crimp) can be used here. For more information

• to design a generic crimping tool,
• to possible areas of application of the generic crimping tool and / or
• to different possible types of crimp connections, which can be produced using the generic crimping tool,

is going to work

• " Crimp technology, production of reliable connections of electrical conductors and plugs "by WEZAG GmbH Werkzeugfabrik, Die Bibliothek der Technik 342, Verlag Moderne Industrie, ISBN 978-3-68236-027-7

directed. Generic crimping pliers in different designs are, for example, from the publications DE 37 08 727 C2 . DE 197 13 580 C2 . DE 197 53 436 C2 . DE 198 02 287 C1 . DE 198 07 737 C2 . EP 3 208 044 A1 and EP 2 305 428 A1 known.

However, serves a generic pressing pliers preferably of the mechanical fluid-tight connection in the fluid technology, for example, for connecting pipes with each other or with fluidic connectors. The pliers are used to plastically deform the pipes to be connected or a so-called fitting that ensures the mechanical connection and the fluid-tight seal. Exemplary embodiments of a generic pressing tongs can be found in the documents DE 197 09 639 A1 . DE 198 34 859 C2 . DE 199 24 086 C2 . DE 199 24 087 C2 . DE 199 63 097 C1 . DE 103 46 241 B3 . EP 2 995 424 A1 be removed.

DE 10 2007 001 235 B4 discloses a non-generic pressing pliers, in which the pliers jaws are pivotally coupled to one another via a swivel joint. A first hand lever is articulated on the swivel joint. A second hand lever is articulated with a cranked end region on a first jaw. Finally, a third hand lever is arranged in an open position of the jaws between the first hand lever and the second hand lever. The third hand lever is articulated in a cranked end area on a pendulum support, the other end area of which is articulated on a second jaw. In the area of their cranks, the first hand lever and the third hand lever are coupled to one another via a respective pivotally articulated pressure lever, a pivot pin for coupling the pressure lever to the third hand lever being fixed to the first hand lever. To bring about a closing movement of the pliers jaws, the three hand levers can use different toggle lever drives in two successive partial closing strokes, optimized for the respective partial closing strokes with regard to the forces and pivoting as follows: In a first partial closing stroke, the third hand lever is pivoted in the direction of the first hand lever. In this case, the joint between the end region of the third hand lever and the pendulum support forms a knee joint of the first toggle lever drive thus formed. At the end of the first partial closing stroke, the first hand lever and the third hand lever are oriented parallel to one another and the first toggle lever drive as well as the first hand lever and the third hand lever are fixed by the user's hands enclosing the two hand levers or by a suitable switching device. In the subsequent second partial closing stroke, the second hand lever is pivoted in the direction of the first and third hand levers. In this case, a second toggle lever drive engages the other jaw. In this second toggle lever drive, one toggle lever is formed by the pressure lever, while the other toggle lever is formed by the cranked end region of the second hand lever and the knee joint is formed by the pivot bearing between the pressure lever and the second hand lever. The three hand levers thus serve to ensure different partial closing strokes of the pliers jaws with different closing movements of a sub-combination of the three hand levers.

OBJECT OF THE INVENTION

• der Kraftverhältnisse,
• des Bedienkomforts und/oder
• der Bediensicherheit,

insbesondere im Zusammenhang mit dem Einlegen eines Werkstücks in die Press- oder Crimpzange und/oder einer Entnahme des Werkstücks aus der Press- oder Crimpzange, verbessert ist.The invention has for its object to propose a manually operated crimping or crimping tool, which with respect

• the force relationships,
• ease of use and / or
• operating safety,

is improved in particular in connection with the insertion of a workpiece into the pressing or crimping tool and / or a removal of the workpiece from the pressing or crimping tool.

SOLUTION

The object of the invention is achieved according to the invention with the features of the independent claim. Further preferred configurations according to the invention can be found in the dependent patent claims.

DESCRIPTION OF THE INVENTION

The invention relates to pressing or crimping pliers of basically any type (cf. also the prior art mentioned at the beginning), provided that it has a fixed pliers part with a fixed hand lever and a fixed pliers jaw. Here, the fixed pliers part can be made in one or more parts. In addition, the pressing or crimping pliers according to the invention have a movable hand lever. The movable hand lever is coupled to a movable jaw by a drive mechanism. Here, the drive mechanism can be designed as any gear connection with a suitable step-up or step-down of the forces and paths. The coupling of the movable hand lever via the drive mechanism to the movable pliers jaw is such that a closing movement of the movable pliers jaw can be brought about by pivoting the movable hand lever in the direction of the fixed hand lever. With this closing movement of the movable pliers jaw, a workpiece is crimped or pressed between the fixed one Pliers jaw and the movable pliers jaw, in particular in the area of dies held or formed by the pliers jaws.

Surprisingly, the invention proposes to equip the pressing or crimping pliers (in addition to the fixed hand lever and the movable hand lever) with a further lever. The other lever is coupled to the movable jaw by a drive connection. The coupling via the drive connection is such that an opening movement of the pliers jaws into an insertion and / or removal position can be brought about by pivoting the further lever.

In the context of the invention, it is possible, for example, that the movement of the further lever is permanently coupled to the movement of the movable hand lever, so that the movable hand lever and the further lever, when one of the two levers is actuated, have the same pivoting or different pivoting with a fixed or structural design experienced predetermined varying gear ratio. However, it is also possible for the movement of the further lever to be decoupled from the movement of the movable hand lever over a partial stroke or over the entire stroke, so that it is possible to pivot the further lever while the movable hand lever is not also pivoted (and / or the other way around).

According to the invention, the different levers provided can be used for different purposes within the scope of the invention: While crimping or pressing of a workpiece can be brought about by a closing movement of the pliers jaws as a result of manual actuation of the movable hand lever, the manual actuation of the further lever can be used to: bring about an opening movement of the pliers jaw in an insertion and / or removal position in which the insertion and / or removal of a workpiece is made possible or simplified.

In the context of the invention, the further lever is preferably arranged in the grip area of a hand, which encloses the fixed hand lever and / or the movable hand lever, or a finger of this hand, so that, for example, on the one hand, without any reaching around or with minimal effort the actuation of the movable hand lever for bringing about the closing movement of the pliers jaws for crimping or crimping a workpiece can be brought about and, on the other hand, by actuating the further lever, the opening movement of the pliers jaws can be brought into the insertion and / or removal position.

In the context of the invention, the further lever can have any shape (for example straight or cranked), have any length and / or be arranged at any point on the pressing or crimping pliers. For a configuration of the pressing or crimping pliers, the further lever is an additional hand lever which is arranged between the fixed hand lever and the movable hand lever. This configuration uses an intermediate space that is present anyway between the fixed hand lever and the movable hand lever for the arrangement of the additional hand lever. In this case, the additional hand lever and the movable hand lever are pivoted in the same swivel plane. It is possible that the end region of the additional hand lever facing away from the pliers head of the pressing or crimping pliers lies in the region of the swiveling circle of the corresponding end region of the movable hand lever or lies outside or within the same.

The actuation kinematics for the actuation of the additional hand lever and the transmission of the movement of the additional hand lever to the movable jaw can be any. For a proposal of the invention, the additional hand lever is coupled to the movable pliers jaw via the drive connection such that an opening movement of the pliers jaws can be brought about by pivoting the additional hand lever in the direction of the fixed hand lever. Without thereby restricting the invention, a possible effect of this embodiment is explained using the following example: If the inner surface of one hand of the user rests on the outer surface of the fixed hand lever, the user can grip the additional hand lever with at least one finger and by means of the force of the at least one finger, pivot the additional hand lever in the direction of the fixed hand lever, whereby the opening movement of the pliers jaws can take place and the insertion and / or removal position can be brought about and the workpiece can be inserted or removed from the pliers jaws or the associated dies. If the closing movement of the pliers jaws for crimping or pressing the workpiece is to be brought about, the user takes his fingers off the additional hand lever and places them on the movable hand lever from the outside, while the inner surface of the hand is still supported on the outside from the fixed hand lever can. The user can then use their fingers to do the necessary Apply forces to the movable hand lever to bring about the closing movement of the pliers jaws for crimping or pressing a workpiece.

The drive connection, via which the additional hand lever is coupled to the movable pliers jaw, can be designed as any gear connection with a step-up or step-down. For a configuration of the pressing or crimping pliers, the drive connection is a fixed connection of the additional hand lever with the movable pliers jaw. It is possible, for example, that the additional hand lever is designed as an integral component with the movable pliers jaw or the additional hand lever and the movable pliers jaw are configured as separate components that are directly or indirectly and detachably or non-detachably, but in any case with a fixed connection are connected. In this way, a structurally simple but reliable drive connection can be provided.

For a further proposal, the pressing or crimping pliers have an opening spring. The opening spring acts on the movable pliers jaw and / or the movable hand lever (directly or indirectly) in such a way that the movable pliers jaw and / or the movable hand lever are / are automatically moved from a closed position to an opening direction. This is particularly advantageous when the pressing or crimping pliers have reached the closed position in which the workpiece is completely crimped or pressed. The opening spring can then be used to automatically open the movable jaw and / or the movable hand lever when the manual forces applied to the fixed hand lever and the movable hand lever are reduced or eliminated, which increases the ease of use of the pressing or crimping pliers.

It is also possible that the pressing or crimping pliers have a closing spring. The closing spring acts on the movable jaw and / or the further lever in such a way that the movable jaw is acted upon in the closing direction and / or the further lever is automatically moved from a closed position towards an open position. A closing spring force generated by the closing spring and acting on the moving jaw in the closing direction can be used, for example, to act upon the other after the insertion and / or removal position has been brought about by actuating the further lever and inserting the workpiece into the dies Lever is reduced or eliminated by the user, while then the closing spring force acts on the movable jaw in the closing direction. Thus, the workpiece between the two jaws with the Closing spring force clamped, with which this can be fixed in the position and / or orientation previously brought about manually between the dies. Under certain circumstances, however, it is also possible for the workpiece, which is fixed in the dies between the jaws, to be readjusted by the user pushing the workpiece into a different orientation and / or position, which then causes the jaws to spring open against the action the closing spring leads or a frictional sliding movement of the workpiece relative to the dies acted upon by the closing spring.

In the context of the invention, an opening spring and / or a closing spring can be formed by a single spring or also a plurality of springs, which can then be arranged in parallel or in series. In this case, the at least one spring can be made of any material (for example metal, plastic, elastomer material, composite material). It can be a compression spring, a tension spring, a torsion spring, a torsion spring or a spring of any other type. The at least one spring can be integrated at any point in the force flow of the pressing or crimping pliers. At least one spring with a linear or a non-linear spring characteristic can be used.

For an embodiment of the pressing or crimping pliers, the closing spring is articulated with a spring base on the fixed pliers part, while it is articulated with the other spring base on the movable pliers part. Alternatively or cumulatively, it is possible that the opening spring is articulated with a spring base on the fixed pliers part, while it is articulated with the other spring base on the movable hand lever.

The invention also includes embodiments in which the opening spring and the closing spring are formed by a single integral spring element, cf. especially the unpublished European patent application with the file number EP 18 166 729.6 ,

The invention includes embodiments in which the drive mechanism for coupling the movable hand lever to the movable pliers jaw is permanently effective, so that the movable hand lever is also moved when the movable pliers jaw is moved by the further lever as a result of the coupling via the drive mechanism. For another embodiment of the pressing or crimping pliers, it is proposed that the drive mechanism, via which the movable hand lever is coupled to the movable pliers jaw, has a game. The game is limited by a stop. By means of the attack and the game, the following advantageous effect can be brought about: during a pivoting of the movable hand lever in the direction of the fixed hand lever with a closing movement of the pliers jaws into the closed position, i.e. during crimping or pressing the workpiece, a drive element of the drive mechanism rests against the stop, with which the game is not effective and a play-free transfer of the pressing or crimping force can take place. If, on the other hand, the further lever is pivoted with an opening movement of the pliers jaws into the insertion and / or removal position, the drive element moves away from the stop, so that a movement takes place using the play. As a result, the movable hand lever is not moved in spite of the opening movement of the pliers jaws for the opening movement to bring about the insertion and / or removal position by actuating the further lever, which may simplify the operation of the pressing or crimping pliers.

The game can be of any size, so that the explained effect occurs only for a partial movement or the explained entire movement. For a proposal of the invention, the game is at least so large that in an open position of the moving hand lever depending on the position of the further lever and caused by this, the movable jaw of the pliers from the closed position can be moved into the open position without the movable hand lever being in its open position leaves. In this way it can be ensured that there is no change in the pivoting angle of the movable hand lever during the entire actuation of the further lever.

For a further proposal of the invention, the opening spring does not exert any opening spring force on the movable pliers jaw in an open position of the movable hand lever, with the result that the closing spring force of the closing spring is not reduced by the action of the opening spring. On the other hand, the closing spring exerts a closing spring force on the movable jaw. This closing spring force is minimal in a closed position of the further lever, while this is maximum in an open position of the further lever. The closing spring can be relaxed in the closed position of the further lever, so that the minimum closing spring force is zero. However, it is also possible that in the closed position of the further lever, the closing spring force is already greater than zero, which means that it is always preloaded. In this way, the closing spring can ensure, for example, that even when a small workpiece is inserted into the dies formed or carried by the pliers jaws, the workpiece is secured between the dies with sufficient closing spring force. Under certain circumstances, the use of a so-called positioner or locator can be dispensed with by holding the workpiece by means of the closing spring force of the closing spring in order to ensure the correct position or orientation of the workpiece relative to the dies.

The provision of the game and a limiting attack can be done in any way. For a configuration of the pressing or crimping pliers, the drive mechanism has an elongated hole which provides the play. In this case, the stop is formed by an end region of the elongated hole. This configuration represents a simple but reliable possibility for the provision of the game and the attack.

As previously explained, any drive mechanism can be used in the crimping or crimping pliers. The drive mechanism is preferably a toggle lever drive. In this case, it is possible for the play and the stop in the toggle lever drive to be provided in that the toggle lever drive has a pivot pin, which can be a pivot pin of a joint for a toggle lever or also a pivot pin for forming the knee joint. In this case, the pivot pin can be received in an elongated hole, with which the required play and the stop can be provided.

For a further embodiment of the crimping or crimping pliers, it is proposed that it have a positive locking. Forced locking is used to secure a once reached closed position of the pliers jaws during crimping or pressing the workpiece, so that the pliers jaws do not open undesirably if the operating force is temporarily reduced by the user or the hand is removed from the press during the press or crimp stroke - or crimping tool is used. On the other hand, the forced locking should enable the pressing or crimping pliers to reopen when a closed position is reached. Within the scope of the invention, the effect and the design of the forced locking mechanism can be specifically adapted to the requirements here as follows: The forced locking mechanism does not secure the position of the movable jaw over the entire possible range of motion of the movable jaw. Rather, the positive lock does not block a movement of the movable pliers jaw caused by the further lever, while the forced lock blocks a movement of the movable pliers jaw caused by the movable hand lever. In other words, the compulsory lock will not take effect if the Removal and / or insertion position is to be brought about by actuation of the further lever, so that an opening movement is possible, while the positive lock is intended to enable the closing movement for crimping or pressing a workpiece, while at the same time securing a closing position achieved in the process.

Advantageous further developments of the invention result from the patent claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are only examples and can have an alternative or cumulative effect without the advantages necessarily having to be achieved by embodiments according to the invention. Without changing the subject matter of the appended claims, the following applies with regard to the disclosure content of the original application documents and the patent: Further features can be found in the drawings, in particular the geometries shown and the relative dimensions of several components with respect to one another, as well as their relative arrangement and operative connection. The combination of features of different embodiments of the invention or of features of different claims is also possible, deviating from the selected back relationships of the claims, and is hereby suggested. This also applies to those features which are shown in separate drawings or mentioned in the description. These features can also be combined with features of different claims. Features listed in the claims can also be omitted for further embodiments of the invention.

The number of features mentioned in the patent claims and the description should be understood in such a way that exactly this number or a greater number than the number mentioned is present without the explicit use of the adverb "at least" being required. If, for example, a spring is mentioned, this should be understood to mean that exactly one spring, two springs or more springs are present. These characteristics can be supplemented by other characteristics or the only characteristics that make up the respective product.

The reference numerals contained in the patent claims do not represent any restriction of the scope of the objects protected by the patent claims. They serve only the purpose of making the patent claims easier to understand.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

zeigt eine räumliche Explosionsdarstellung einer Crimpzange.

Fig. 2

zeigt die Crimpzange gemäß Fig. 1 in einer Draufsicht in einem teildemontiertem Zustand.

Fig. 3 bis 9

zeigen die Crimpzange gemäß Fig. 1 und 2 in unterschiedlichen Betriebsstellungen (Fig. 3: Vorratsstellung, Fig. 4: Einlegestellung; Fig. 5: Haltestellung; Fig. 6: Ausgangsstellung; Fig. 7: Schließstellung; Fig. 8: Öffnungsstellung des beweglichen Handhebels und Zangenbacken in der Schließstellung; Fig. 9: Entnahmestellung.

Fig. 10

zeigt eine räumliche Explosionsdarstellung einer Crimpzange gemäß den Fig. 1 bis 9 mit zusätzlicher Elektronik-Baueinheit.

Fig. 11 und 12

zeigen in einer Draufsicht in unterschiedlichen teildemontierten Zuständen eine weitere Ausführungsform einer Crimpzange.

Fig. 13

zeigt in einer Draufsicht in einem teildemontiertem Zustand eine weitere Ausführungsform einer Crimpzange.

Fig. 14

zeigt in einer Draufsicht in einem teildemontiertem Zustand eine weitere Ausführungsform einer Crimpzange.

The invention is further explained and described below with reference to preferred exemplary embodiments illustrated in the figures.

Fig. 1

shows a spatial exploded view of a crimping tool.

Fig. 2

shows the crimping tool according to Fig. 1 in a plan view in a partially disassembled state.

3 to 9

show the crimping tool according to Fig. 1 and 2 in different operating positions ( Fig. 3 : Supply position, Fig. 4 : Insertion position; Fig. 5 : Stop position; Fig. 6 : Starting position; Fig. 7 : Closed position; Fig. 8 : Open position of the movable hand lever and jaws in the closed position; Fig. 9 : Withdrawal position.

Fig. 10

shows a spatial exploded view of a crimping tool according to the 1 to 9 with additional electronics unit.

11 and 12

show a top view in different partially disassembled states of a further embodiment of a crimping tool.

Fig. 13

shows a plan view in a partially disassembled state of another embodiment of a crimping tool.

Fig. 14

shows a plan view in a partially disassembled state of another embodiment of a crimping tool.

DESCRIPTION OF THE FIGURES

In the context of the present description of the figures, the same reference number is used for different embodiments of components which correspond or are similar in terms of geometries and / or functions. If there are several components that correspond in terms of their function and / or geometry in one embodiment, some of them are identified by the same reference numerals, and then supplementary a distinction is made by a), b), .... In this case, the reference symbols can be used with or without the additional letters.

• eine Einlege- und/oder Entnahmestellung, in welcher die Zangenbacken so weit geöffnet sind, dass das mit den Gesenken gebildete Zangenmaul so weit geöffnet ist, dass ein nicht verpresstes oder vercrimptes Werkstück mit Spiel in die Gesenke eingelegt werden kann und ein verpresstes oder vercrimptes Werkstück mit einem größeren Spiel aus den Gesenken entnommen werden kann,
• eine Vorratsstellung, in welcher die Öffnung des Zangenmauls gegenüber der Einlege- und/oder Entnahmestellung verringert ist und welche die Press- oder Crimpzange ohne einwirkende Kräfte und ohne in die Gesenke eingelegtes Werkstück einnimmt (wobei die Vorratsstellung der Zangenbacken aber auch durchaus der Schließstellung der Zangenbacken entsprechen kann) und
• eine Ausgangsstellung, in welcher die Öffnung der Gesenke gegenüber der Einlege- und/oder Entnahmestellung verringert ist, aber die Öffnung der Gesenke größer ist als in der Vorratsstellung und in welcher vor dem Beginn des Vercrimpens oder Verpressens des Werkstücks die Gesenke infolge der Schließfederkraft an das Werkstück gedrückt werden und dieses fixieren.

A closed position of a movable hand lever or additional hand lever denotes a position in which the movable hand lever or the additional hand lever is pivoted at most in the direction of the fixed hand lever. A corresponding pivoting movement is referred to as a closing movement or closing stroke. Conversely, an opening position and opening movement denotes the position of the movable hand lever or additional hand lever in which the movable lever or additional hand lever (preferably maximally) is pivoted away from the fixed hand lever, or the corresponding movement to bring about the open position. With regard to the movable pliers part and the movable pliers jaw, the closed position indicates the position in which the pliers jaws are closed to the maximum, that is to say a workpiece arranged in the dies is completely pressed or crimped. The closing movement characterizes the movement in the direction of the closed position. An open position of the movable pliers jaw denotes a position of the pliers jaws which is open with respect to the closed position and the opening movement means the movement of the pliers jaws in the direction of the open position. Possible opening positions are in particular

• an insertion and / or removal position in which the pliers jaws are opened so far that the pliers mouth formed with the dies is so wide open that a non-compressed or crimped workpiece can be inserted into the dies with play and a pressed or crimped workpiece can be removed from the dies with a larger clearance,
• a supply position in which the opening of the pliers jaw is reduced compared to the insertion and / or removal position and which the crimping or crimping pliers occupy without any forces and without a workpiece being inserted into the dies (the storage position of the pliers jaws but also definitely the closed position of the pliers jaws can correspond) and
• a starting position, in which the opening of the dies is reduced compared to the insertion and / or removal position, but the opening of the dies is larger than in the storage position and in which before crimping or pressing begins of the workpiece, the dies are pressed against the workpiece as a result of the closing spring force and fix it.

Starting from the starting position, the actual pressing or crimping stroke is then carried out by the user when the movable hand lever is actuated, which (possibly after a certain idle stroke) runs from the starting position to the closed position.

For that in the 1 to 9 The illustrated embodiment of a crimping pliers 1 has a fixed pliers part 2 and a movable pliers part 3. The fixed pliers part 2 has a fixed pliers jaw 4 and a fixed hand lever 5, which are firmly connected to one another. The movable pliers part 3 has a movable pliers jaw 6.

The fixed pliers part 2 and the movable pliers part 3 are pivotally connected to one another via a pivot bearing 7.

A movable hand lever 9 is articulated on the fixed pliers part 2 via a pivot bearing 8. The movable hand lever 9 is coupled to the movable pliers part 3 via a drive mechanism 10 in such a way that by means of a manual pivoting of the movable hand lever 9 relative to the fixed hand lever 5, the movable pliers part 3 and thus the movable pliers jaw 6 relative to the fixed pliers jaw 4 can be brought about.

It is possible that the pliers jaws 4, 6 directly form dies for pressing or crimping a workpiece. For the illustrated embodiment, however, the pliers jaws 4, 6 carry dies by suitable receptacles, the receptacles and dies corresponding to the patent specification US 6,053,025 A , the disclosure of which is made the subject of the present patent application.

For the illustrated embodiment, the drive mechanism 10 is designed as a toggle lever drive 11. As especially in Fig. 3 It can be seen that the toggle lever drive 11 has a toggle lever 13 designed as a pressure lever 12, while the other toggle lever 14 is formed by a cranked end region of the movable hand lever 9. The two toggle levers 13, 14 are pivotally connected to one another via a knee joint 15. The toggle lever 14 is from the cranked material area of the movable hand lever 9 between the Swivel bearing 8 and the knee joint 15 are formed. The end region of the toggle lever 13 facing away from the knee joint 15 is articulated on the movable tong part 3 via a pivot bearing 16.

As especially in Fig. 3 can be seen, the toggle levers 13, 14 form a knee angle in the storage position 55, which is in the range from 90 ° to 120 °. By moving the movable hand lever 3 from its open position to its closed position, the knee angle can be increased, the knee angle in the closed position being, for example, between 170 ° and 180 °, so that with the closing movement the knee angle approximates the extended position with the associated large position Power development of the toggle lever drive 11.

• Für das Ausführungsbeispiel gemäß Fig. 1 bis 9 sind die Zangenteile 2, 3 jeweils in Plattenbauweise ausgebildet, hier jeweils mit zwei Platten, nämlich zwei festen Zangenteilplatten 17a, 17b sowie beweglichen Zangenteilplatten 18a, 18b. Hierbei sind die beweglichen Zangenteilplatten 18a, 18b unmittelbar benachbart zueinander angeordnet und zwischen den beiden festen Zangenteilplatten 17a, 17b angeordnet. Während die beweglichen Zangenteilplatten 18a, 18b hier dieselbe Geometrie (insbesondere Außengeometrie und Bohrungsgeometrie) aufweisen, unterscheiden sich die festen Zangenteilplatten 17a, 17b für das dargestellte Ausführungsbeispiel dadurch, dass die Zangenteilplatte 17a einen festen Handhebelteil 19 ausbildet, während bei der festen Zangenteilplatte 17b kein entsprechendes festes Handhebelteil vorhanden ist.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel sind die Schwenklager 7, 8, 16 und ist das Kniegelenk 15 jeweils mit einem Schwenkbolzen 20, 21, 22, 23 ausgebildet, welche jeweils in geeigneten Bohrungen unter Ermöglichung des Schwenk-Freiheitsgrads an den Bauelementen, die über das Schwenklager 7, 8, 16 bzw. das Kniegelenk 15 miteinander verbunden sind, gehalten sind.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel befindet sich der von dem Druckhebel 12 ausgebildete Kniehebel 13 außerhalb der festen Zangenteilplatten 17, während der Kniehebel 14 innerhalb der festen Zangenteilplatten 17a, 17b angeordnet ist.

In the following, optional design options of the crimping tool 1 are described, which can be used alternatively or cumulatively:

• For the embodiment according to 1 to 9 The pliers parts 2, 3 are each designed in plate construction, here each with two plates, namely two fixed pliers part plates 17a, 17b and movable pliers part plates 18a, 18b. Here, the movable tong part plates 18a, 18b are arranged immediately adjacent to each other and between the two fixed tong part plates 17a, 17b. While the movable tong part plates 18a, 18b here have the same geometry (in particular the outside geometry and the bore geometry), the fixed tong part plates 17a, 17b differ for the exemplary embodiment shown in that the tong part plate 17a forms a fixed hand lever part 19, while with the fixed tong part plate 17b no corresponding one fixed hand lever part is present.
• For that in the 1 to 9 The exemplary embodiment shown are the swivel bearings 7, 8, 16 and the knee joint 15 is each formed with a swivel pin 20, 21, 22, 23, each of which is provided in suitable bores while enabling the degree of swivel freedom on the components which are connected to the swivel bearing 7, 8 , 16 or the knee joint 15 are connected to each other, are held.
• For that in the 1 to 9 In the illustrated embodiment, the toggle lever 13 formed by the pressure lever 12 is located outside the fixed tong part plates 17, while the toggle lever 14 is arranged inside the fixed tong part plates 17a, 17b.

• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel sind zwei bewegliche Handhebelplatten 26a, 26b vorhanden, die unmittelbar benachbart zueinander angeordnet sind. Die beweglichen Handhebelplatten 26 erstrecken sich in denselben Ebenen wie die beweglichen Zangenteilplatten 18. Die beweglichen Zangenteilplatten 18 und die beweglichen Handhebelplatten 26 sind jeweils starr miteinander verbunden. Dasselbe gilt für die festen Zangenteilplatten 17.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel sind zwei Kniehebel 13a, 13b in Form von zwei Druckhebeln 12 vorhanden, die über die Schwenkbolzen 22, 23 miteinander gekoppelt sind und auf unterschiedlichen Seiten außenliegend von dem festen Zangenteilplatten 17 angeordnet sind.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel sind die beweglichen Zangenteilplatten 18a, 18b zweistückig ausgebildet, was beispielhaft für eine bewegliche Zangenteilplatte 18a erläutert wird: Die bewegliche Zangenteilplatte 18a weist eine Tragplatte 27 auf, die die Bohrung für den Schwenkbolzen 21 des Schwenklagers 8 aufweist. In dem dem Zangenkopf zugewandten Endbereich verfügt die Tragplatte 27 über einen Befestigungsbereich 28 für eine Zangenbackenplatte 29. Für das dargestellte Ausführungsbeispiel erfolgt die Befestigung der Zangenbackenplatte 29 in dem Befestigungsbereich 28 an der Tragplatte 27 über zwei beabstandet voneinander angeordnete Befestigungsbolzen 30, 31, die in korrespondierenden Bohrungen der Tragplatte 27 und der Zangenbackenplatte 29 aufgenommen sind. Hier sind die Längsachsen der Befestigungsbolzen 30, 31 in montiertem Zustand ungefähr tangential zu der Schwenkachse des Schwenklagers 8 orientiert. Die Tragplatte 27 und die Zangenbackenplatte 29 sind jeweils in grober Näherung L-förmig ausgebildet, wobei die beiden kurzen Schenkel des L zur

For this reason, the pivot pin 23 of the knee joint 15 is passed through the fixed tong part plates 17a, 17b. In order not to impede the movement of the pivot pin 23 during the actuation of the toggle lever drive 11, the fixed pliers partial plates 17a, 17b have elongated holes 24a, 24b which are curved in accordance with the required movement of the pivot pin 23. Correspondingly, the fixed tong part plates 17 also have elongated holes 25a, 25 so as not to hinder the movement of the pivot pin 22 during the actuation of the toggle lever drive 11 and to enable the movement of the movable tong part 3.

• For that in the 1 to 9 illustrated embodiment, there are two movable hand lever plates 26a, 26b, which are arranged immediately adjacent to each other. The movable hand lever plates 26 extend in the same planes as the movable tong part plates 18. The movable tong part plates 18 and the movable hand lever plates 26 are each rigidly connected to one another. The same applies to the fixed tong part plates 17.
• For that in the 1 to 9 In the illustrated embodiment, there are two toggle levers 13a, 13b in the form of two pressure levers 12, which are coupled to one another via the pivot bolts 22, 23 and are arranged on different sides on the outside of the fixed tong part plates 17.
• For that in the 1 to 9 In the illustrated embodiment, the movable tong part plates 18a, 18b are formed in two pieces, which is explained by way of example for a movable tong part plate 18a: The movable tong part plate 18a has a support plate 27 which has the bore for the pivot pin 21 of the pivot bearing 8. In the end area facing the pliers head, the support plate 27 has a fastening area 28 for a pliers jaw plate 29. For the illustrated embodiment, the pliers jaw plate 29 is fastened in the fastening area 28 on the support plate 27 by means of two spaced-apart fastening bolts 30, 31, which correspond in corresponding manner Bores of the support plate 27 and the jaw plate 29 are added. Here, the longitudinal axes of the fastening bolts 30, 31 are oriented approximately tangentially to the pivot axis of the pivot bearing 8 in the assembled state. The support plate 27 and the jaw plate 29 are each roughly L-shaped, the two short legs of the L for

• Für das Ausführungsbeispiel gemäß Fig. 1 bis 9 wirkt auf den Kniehebeltrieb 11 ein Zwangsgesperre 32 ein. Mittels des Zwangsgesperres 32 soll eine einmal erreichte Stellung der beweglichen Zangenbacke 6 während des Press- oder Crimphubs gegen eine Öffnung gesichert werden, was in einzelnen Stufen des Zwangsgesperres 32 erfolgt. Ist die Schließstellung der beweglichen Zangenbacke 6 erreicht, entfällt die Sicherungswirkung des Zwangsgesperres 32, so dass die bewegliche Zangenbacke 6 wieder geöffnet werden kann. Für das dargestellte Ausführungsbeispiel weist der bewegliche Handhebel 9, hier die beweglichen Handhebelplatten 26a, 26b, eine Sperrverzahnung 33 auf. In die Sperrverzahnung 33 greift ein Sperrglied 34 ein, welches verschwenkbar an dem festen Zangenteil 2 gelagert ist und über eine Feder 35 des Zwangsgesperres 32 in eine sperrende Richtung beaufschlagt ist. Hierbei sind die Geometrie der Sperrverzahnung 33 und des Sperrglieds 34 und die Wirkung der Feder 35 so abgestimmt, dass das Sperrglied 34 für eine Schließbewegung des beweglichen Handhebels 9 entlang der Sperrverzahnung 23 ratschenartig bewegt werden kann, während dieses für eine Öffnungsbewegung des beweglichen Handhebels 9 sperrend in die Sperrverzahnung 33 eingreift. Mit dem Erreichen der Schließstellung des beweglichen Handhebels 9 klappt das Sperrglied 34 so um, dass eine andere Eingriffsfläche des Sperrglieds 34 mit der Sperrverzahnung 33 in Wechselwirkung tritt, womit die Öffnungsbewegung des Handhebels 9 ermöglicht ist.
• Für das Ausführungsbeispiel gemäß Fig. 1 bis 9 wird das bewegliche Zangenteil 3 über eine Schließfeder 36 in Schließrichtung beaufschlagt. Die Schließfeder 63 ist mit einem Federfußpunkt 37 an dem festen Zangenteil 2, hier über einen von dem festen Zangenteil 2 getragenen Bolzen 38, abgestützt. Der andere Federfußpunkt 39 ist an dem beweglichen Zangenteil 3, hier über einen von dem beweglichen Zangenteil 3 getragenen Bolzen 40, abgestützt.
• Für das Ausführungsbeispiel gemäß Fig. 1 bis 9 sind zwei parallel auf das bewegliche Zangenteil 3 wirkende Schließfedern 36 vorgesehen. Die beiden Schließfedern 36 sind hierbei außenliegend von den beiden festen Zangenteilplatten 17 angeordnet. Der Bolzen 40 erstreckt sich somit durch Langlöcher 41a, 41b der festen Zangenteilplatten 17, die so angeordnet und geformt sind, dass diese die Bewegung des Bolzens 40 mit der Verschwenkung des beweglichen Zangenteils 3 nicht behindern.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel wirkt auf den beweglichen Handhebel 9 eine Öffnungsfeder 42. Die Öffnungsfeder 42 ist mit einem Federfußpunkt 43, hier mittels eines Bolzens 44, an dem festen Zangenteil 2 abgestützt. Der andere Federfußpunkt 45 ist, hier über einen Bolzen 46, an dem beweglichen Handhebel 9 abgestützt, was exzentrisch zu der Schwenkachse des Schwenklagers 8 so erfolgt, dass die Öffnungsfeder 42 den beweglichen Handhebel 9 in Öffnungsrichtung beaufschlagt.
• Für das in den Fig. 1 bis 9 dargestellte Ausführungsbeispiel sind zwei Öffnungsfedern 42 vorhanden, welche parallel auf den beweglichen Handhebel 9 einwirken und außerhalb der festen Zangenteilplatten 17 angeordnet sind. Aus diesem Grund ist der Bolzen 46 durch Langlöcher 47a, 47b der festen Zangenteilplatten 17a, 17b hindurchgeführt, die so angeordnet und geformt sind, dass diese die Verschwenkung des beweglichen Handhebels 9 nicht behindern. Hierbei kann mit dem Erreichen der Öffnungsstellung des beweglichen Handhebels 9 der Bolzen 46 zur Anlage an einen Endbereich des Langlochs 47 kommen, womit die Öffnungsstellung des beweglichen Handhebels 9 vorgeben ist und eine weitere Öffnung des beweglichen Handhebels 9 unmöglich ist.
• Für das in Fig. 1 bis 9 dargestellte Ausführungsbeispiel weist das bewegliche Zangenteil 3 einen weiteren Hebel 48, der hier als Zusatz-Handhebel 49 ausgebildet ist, auf. Der Zusatz-Handhebel 49 ist hierbei als stangenartiger, bspw. leicht gekrümmter, Fortsatz der beweglichen Zangenteilplatten 18 ausgebildet. Der Zusatz-Handhebel 49 ist hierbei zwischen dem festen Handhebel 5 und dem beweglichen Handhebel 9 angeordnet, wobei dessen Schwenkbereich bspw. mindestens um einen Faktor 2, mindestens um einen Faktor 3, mindestens um einen Faktor 4, mindestens um einen Faktor 5 oder sogar mindestens um einen Faktor 8 kleiner ist als der Schwenkbereich des beweglichen Handhebels 9. In der Schließstellung des beweglichen Handhebels 9 (vgl. Fig. 7) ist der Zusatz-Handhebel 49 ungefähr mittig zwischen dem beweglichen Handhebel 9 und dem festen Handhebel 5 angeordnet. Für das dargestellte Ausführungsbeispiel ist der Zusatz-Handhebel 49 kürzer ausgebildet als der bewegliche Handhebel 9 oder das Schwenkkreissegment des Endbereichs des Zusatz-Handhebels 49 liegt innerhalb des Schwenkkreissegmentes des beweglichen Handhebels 9, ohne dass dies zwingend der Fall sein muss. Der Zusatz-Handhebel 49 ist derart ausgebildet und angeordnet, dass dieser von einer Hand, welche von außen auf den festen Handhebel 5 aufgelegt ist, mit den Fingern dieser Hand, zumindest einem vorderen Finger, umgriffen und betätigt werden kann. Es versteht sich, dass je nach Länge des Zusatz-Handhebels 49 die Zahl der Finger, welche für die Betätigung des Zusatz-Handhebels 49 genutzt werden kann, variieren kann.
• Ist der Antriebsmechanismus 10, hier der Kniehebeltrieb 11 ohne ein Spiel ausgebildet, korreliert jede Stellung des beweglichen Handhebels 9 ein-eindeutig mit einer zugeordneten Stellung des Zusatz-Handhebels 49 und des beweglichen Zangenteils 3 mit der beweglichen Zangenbacke 6. Um diese eindeutige Zuordnung aufzulösen, ist in dem Antriebsmechanismus 10, hier dem Kniehebeltrieb 11 ein Spiel 50 vorgesehen. Für das dargestellte Ausführungsbeispiel wird das Spiel 50 dadurch bereitgestellt, dass die Kniehebel 13, 14 nicht ausschließlich im Bereich des Kniegelenks 15 über einen Schwenk-Freiheitsgrad miteinander gekoppelt sind, sondern dass die Kniehebel 13, 14 im Bereich des Kniegelenks 15 auch einen Verschiebe-Freiheitsgrad aufweisen. Zu diesem Zweck weisen die Kniehebel 13, hier der Druckhebel 12, im Bereich des Kniehebels 14 ein Langloch 51 auf, in welchem der Schwenkbolzen 23 verschieblich geführt ist. Die Länge des Langlochs 51 gibt dabei das Spiel 50 vor. Ein Endbereich des Langlochs 51 bildet einen Anschlag 52 für den Schwenkbolzen 23 des Kniehebeltriebs 11 aus. Während des Press- oder Crimphubs liegt der Schwenkbolzen 23 an dem Anschlag 52 zwecks Übertragung der Press- oder Crimpkraft an.

Formation of the fastening area 28 overlap and the long legs of the L are arranged parallel to one another. The pliers jaw plates 29 are attached to the support plates 27 from the outside, so that the pliers jaw plates 29 extend in the same plane as the fixed tong part plates 17a, 17b.

• For the embodiment according to 1 to 9 acts on the toggle lever drive 11, a positive lock 32. By means of the positive lock 32, once the position of the movable pliers jaw 6 is reached, it is to be secured against an opening during the pressing or crimping stroke, which takes place in individual stages of the positive lock 32. If the closed position of the movable pliers jaw 6 is reached, the securing action of the positive lock 32 is eliminated, so that the movable pliers jaw 6 can be opened again. For the exemplary embodiment shown, the movable hand lever 9, here the movable hand lever plates 26a, 26b, has locking teeth 33. A locking member 34 engages in the locking toothing 33, which is pivotably mounted on the fixed pliers part 2 and is acted upon in a locking direction by a spring 35 of the positive locking 32. Here, the geometry of the locking toothing 33 and the locking member 34 and the action of the spring 35 are coordinated such that the locking member 34 can be moved in a ratchet-like manner for a closing movement of the movable hand lever 9 along the locking toothing 23, while locking it for an opening movement of the movable hand lever 9 engages in the locking teeth 33. Upon reaching the closed position of the movable hand lever 9, the locking member 34 folds over so that another engagement surface of the locking member 34 interacts with the locking toothing 33, whereby the opening movement of the hand lever 9 is made possible.
• For the embodiment according to 1 to 9 the movable pliers part 3 is acted upon by a closing spring 36 in the closing direction. The closing spring 63 is supported with a spring base point 37 on the fixed pliers part 2, here via a bolt 38 carried by the fixed pliers part 2. The other spring base point 39 is supported on the movable pliers part 3, here via a bolt 40 carried by the movable pliers part 3.
• For the embodiment according to 1 to 9 two closing springs 36 acting in parallel on the movable pliers part 3 are provided. The two closing springs 36 are arranged here on the outside of the two fixed pliers partial plates 17. The bolt 40 thus extends through elongated holes 41a, 41b of the fixed tong part plates 17, which are arranged and shaped such that they do not hinder the movement of the bolt 40 with the pivoting of the movable tong part 3.
• For that in the 1 to 9 The exemplary embodiment shown acts on the movable hand lever 9 an opening spring 42. The opening spring 42 is supported on the fixed pliers part 2 with a spring base 43, here by means of a bolt 44. The other spring base point 45 is supported here on the movable hand lever 9 via a bolt 46, which takes place eccentrically to the pivot axis of the pivot bearing 8 in such a way that the opening spring 42 acts on the movable hand lever 9 in the opening direction.
• For that in the 1 to 9 In the exemplary embodiment shown, there are two opening springs 42, which act in parallel on the movable hand lever 9 and are arranged outside the fixed tong part plates 17. For this reason, the bolt 46 is passed through elongated holes 47a, 47b of the fixed tong part plates 17a, 17b, which are arranged and shaped such that they do not hinder the pivoting of the movable hand lever 9. When the open position of the movable hand lever 9 is reached, the bolt 46 can come into contact with an end region of the elongated hole 47, which specifies the open position of the movable hand lever 9 and makes it impossible to open the movable hand lever 9 further.
• For that in 1 to 9 In the illustrated embodiment, the movable pliers part 3 has a further lever 48, which is designed here as an additional hand lever 49. The additional hand lever 49 is in this case designed as a rod-like, for example slightly curved, extension of the movable tong part plates 18. The additional hand lever 49 is arranged between the fixed hand lever 5 and the movable hand lever 9, the pivoting range of which, for example, is at least a factor of 2, at least a factor of 3, at least a factor of 4, at least a factor of 5 or even at least is smaller by a factor of 8 than the pivoting range of the movable hand lever 9. In the closed position of the movable hand lever 9 (cf. Fig. 7 ) the additional hand lever 49 is arranged approximately centrally between the movable hand lever 9 and the fixed hand lever 5. For the illustrated embodiment, the additional hand lever 49 is shorter than the movable hand lever 9 or the swivel circle segment of the end region of the additional hand lever 49 lies within the swivel circle segment of the movable hand lever 9, without this necessarily being the case. The additional hand lever 49 is designed and arranged in such a way that it can be gripped and actuated by a hand, which is placed on the fixed hand lever 5 from the outside, with the fingers of this hand, at least one front finger. It goes without saying that, depending on the length of the additional hand lever 49, the number of fingers which can be used to actuate the additional hand lever 49 can vary.
• If the drive mechanism 10, here the toggle lever drive 11 is designed without play, each position of the movable hand lever 9 correlates unambiguously with an assigned position of the additional hand lever 49 and of the movable pliers part 3 with the movable pliers jaw 6. In order to resolve this clear assignment, a play 50 is provided in the drive mechanism 10, here the toggle lever drive 11. For the exemplary embodiment shown, the game 50 is provided in that the toggle levers 13, 14 are not coupled to one another exclusively in the region of the knee joint 15 by means of a degree of freedom of pivoting, but rather that the toggle levers 13, 14 are also coupled in the region of the knee joint 15 by a degree of freedom of displacement exhibit. For this purpose, the toggle levers 13, here the pressure lever 12, have an elongated hole 51 in the region of the toggle lever 14, in which the pivot pin 23 is displaceably guided. The length of the slot 51 specifies the game 50. One end region of the elongated hole 51 forms a stop 52 for the pivot pin 23 of the toggle lever mechanism 11. During the pressing or crimping stroke, the pivot pin 23 bears against the stop 52 for the purpose of transmitting the pressing or crimping force.

The function of the crimping tool 1 according to the in 1 to 9 illustrated embodiment is now based on the different in 3 to 9 Operating positions of the crimping tool 1 illustrated:
Fig. 3 shows the crimping pliers 1 without actuating forces applied by the user and without a workpiece inserted in dies 53, 54. As a result of the action of the closing spring 36, the movable pliers part with the movable pliers jaw 6 or their dies 53, 53 is in the closed position, so that the pliers mouth is open. This closed position correlates with an open position of the additional hand lever 49. The closing spring 36 is located in the Condition of minimal closing spring force. In the closed position, the closing spring force can be zero or it can already be greater than zero. If the drive mechanism 10 did not have the play 50, the closed position of the jaws 4, 6 would correlate with the closed position of the movable hand lever 9. However, since the play 50 is provided here through the elongated hole 51 of the pressure lever 12, the opening spring 42 can move the movable hand lever 9 into the open position. In the operating position according to Fig. 3 the opening spring 42 also has a minimal opening spring force acting in the opening direction. The operating position according to Fig. 3 can also be referred to as stock position 55.

From stock position 55 according to Fig. 3 can be an insertion and / or removal position 56 according to Fig. 4 be brought about. For this purpose, the additional hand lever 49 is pivoted manually from its open position in accordance with Fig. 3 in its closed position Fig. 4 , This goes hand in hand with a corresponding pivoting of the movable pliers part 3, with which this and the movable pliers jaw 6 assume the opening position, namely the insertion and / or removal position 56. As a result of the game 50, the movable hand lever 9 can remain in its open position. During the pivoting of the additional hand lever 49, the pivot pin 23 slides along the elongated hole 51. With the pivoting of the additional hand lever 49, the closing spring force of the closing spring 36 is increased. Since the moving hand lever 9 is not pivoted, the opening spring force of the opening spring 42 changes Not. As in Fig. 4 indicated, a workpiece 57 can be inserted into the jaws of the pliers and between the dies 53, 54 in the insertion and / or removal position 56 thus produced.

If the manual forces applied to the additional hand lever 49 are eliminated, the action of the closing spring 36 causes the additional hand lever 49 to move automatically in the opening direction, which is accompanied by a closing movement of the movable pliers part 3. This closing movement takes place until a stop position 58 according to Fig. 5 is reached. In the holding position 58, the closing spring force exerted by the closing spring 36 on the movable tong part 3 is supported in that the workpiece is clamped between the tong jaws 4, 6 or between the dies 53, 54. This clamping due to the closing spring force leads to a securing of the position and / or orientation of the workpiece 57 with respect to the dies 53, 54. For the transition from the insertion and / or removal position 56 according to FIG Fig. 4 to stop position 58 according to Fig. 5 the closing spring force of the closing spring 36 has decreased, which also occurs when using a small workpiece 57 as a result of Design of the closing spring 36 is still large enough to ensure the maintenance of the position and / or orientation of the workpiece 57. The opening spring force of the opening spring 42 remains unchanged. During the movement from the insertion and / or removal position 56 according to FIG Fig. 4 in the holding position 58 according to Fig. 5 the pivot pin 23 has moved a partial path along the elongated hole 51, the pivot pin 23 being arranged at a distance from the stop 52 of the elongated hole 51. The remaining distance of the pivot pin 23 from the stop 52 depends on the size of the workpiece 57 in the unpressed or uncrimped state.

The user can now apply actuation forces to the movable hand lever 9. From the stop position according to Fig. 5 the actuation of the movable hand lever 9 initially leads to an idle stroke in which the movement of the hand lever 9 is not connected to a movement of the movable pliers part 3. Rather, the distance of the pivot pin 23 from the stop 52 is overcome in the idle stroke, so that at the end of the idle stroke the pivot pin 23 comes to rest against the stop 52. An initial position 59 is thus reached, which is shown in Fig. 6 is shown. During the idle stroke, the closing spring force of the closing spring 36 does not change, while the opening spring force of the opening spring 42 increases, so that the opening spring 42 must be deflected by means of the manual actuation force during the idle stroke.

Starting from the starting position 59 according to Fig. 6 The actual pressing or crimping stroke can then be carried out, at the end of which the closed position 60 according to Fig. 7 is achieved. The game 50 is eliminated during the press or crimp stroke. In the toggle lever drive 11, the pivot pin 23 no longer has the translational degree of freedom provided by the elongated hole 51 during the pressing or crimping stroke. Rather, the pivot pin 23 rests against the stop 52 for the purpose of force transmission in the toggle lever drive 11, wherein a pivoting movement in the region of the stop 52 and the knee joint 15 thus provided is still possible. During the pressing or crimping stroke, due to the pivoting of the movable hand lever 9, the opening spring 42 is acted upon further. At the same time, as the movable tong part 3 is pivoted, the closing spring 36 is reduced. When the closing position 7 is reached, the workpiece 57 is completely between the dies 53, 54 pressed or crimped. If the hand forces applied by the user are then eliminated, the closed position of the pliers jaws 4, 6 and the open position of the additional hand lever 49 are maintained as a result of the action of the closing spring 36, so that the closing spring force generated by the closing spring 36 also ensures that the crimped workpiece 57 is clamped between the jaws 4, 6, here between the dies 53, 54 and cannot fall out of the dies 53, 54. The effect of the opening spring 42 leads to a pivoting of the hand lever 9 from the closed position according to Fig. 7 in the open position according to Fig. 8 he follows. The play 50 of the drive mechanism 10 is used during this movement. For the illustrated embodiment, this means that the pivot pin 23 moves away from the stop 52.

If the pressed or crimped workpiece 57 is then to be removed from the crimping pliers 1, the additional hand lever 49 can be used to transfer the movable pliers part 3 and the movable pliers jaw 6 into the insertion and / or removal position 56 (cf. Fig. 9 ).

If a forced locking mechanism 32 is present in the crimping pliers 1, this produces a locking effect exclusively during the empty stroke and / or the pressing or crimping stroke, so that the other movements described above are not impeded by the positive locking mechanism 32.

It is possible that an intermediate space formed between plates of the crimping pliers 1, here fixed pliers partial plates 17 and / or movable pliers partial plates 18, is closed or sealed from the outside by a covering 61, for example made of plastic. For the exemplary embodiment shown here, the cover 61 is roughly T-shaped with a web 62 formed by a vertical leg. In the region of the web 62, the cover 61 is fastened with the movable pliers part 3, which is done here by means of the fastening bolts 30, 31 he follows. A corresponding cladding 63 extends in the area of the outer end faces of the fixed pliers partial plates 17. For the exemplary embodiment shown, the cladding 63 has outer fastening eyelets 64, the function of which will be described below.

For that in 1 to 9 In the illustrated embodiment, the crimping pliers 1 only have a mechanical pliers part 65. For a modified embodiment, the Crimping tool 1 according to Fig. 10 in addition to the mechanical pliers part 65 via an electronic assembly 66. The configuration of the electronic assembly 66, its functions, its coupling with the mechanical pliers part 65 and / or its energy supply and its wireless or wired communication can / may be according to the not previously published European patent application with the official file number EP 18 173 803.0 be trained, which is made the subject of the present patent application in this regard.

The electronic assembly 66 has a housing which is formed with two half-shell-like housing parts 67, 68, wherein a transparent cover disk 69 can also be arranged in a housing part 67, 68 to form a viewing window for a display or display 70. A circuit board 71 is arranged in an intermediate space arranged between the housing, here a housing part 67 and the mechanical pliers part 65. The housing parts 67, 68 are latched, locked or pressed together and with the fastening eyelets 64 via suitable connecting pins and receptacles.

For an electrical power supply to the electronic assembly 66, it can have a holder 72 with a battery or a rechargeable accumulator 73. For the illustrated embodiment, the holder 72 is held on the fixed pliers part 2, here in the area of the fixed hand lever part 19, which is already in the 1 to 9 has been shown, although this is not necessary here for the purely mechanical design of the crimping tool 1. It is possible for a handle 74 to be pushed onto the fixed hand lever part 19, in the interior of which the holder 72 with the battery 73 is then received. The handle 74 can then be fixed to the fixed pliers part 2, here the fixed hand lever part 19, which can also be done by a latching and / or locking connection, for example with a detachable connection, by pressing a push button to unlatch the handle 74 can, which can for example be arranged on the inner side facing the other hand lever 9. The removal of the handle 74 can be used for an exchange of a battery or an accumulator 73.

Fig. 11 and 12 show an embodiment of a crimping tool 1 which, apart from the differences mentioned below, essentially corresponds to the embodiment of the crimping tool 1 1 to 9 equivalent. Here, however, the pressure lever 12 does not have an elongated hole 51, so that the drive mechanism 10 also has no play 50. This means that with the Actuation of the additional hand lever 49 for the purpose of transferring the movable pliers jaw 6 into the insertion and / or removal position 56 also causes the movable hand lever 9 to be pivoted (further) in the opening direction.

Deviating from 1 to 9 are for that in Fig. 11 and 12 The illustrated embodiment also includes the closing spring 36 and the opening spring 42 and integrated in the crimping pliers 1: The closing spring 36 and the opening spring 42 are designed here as an integral spring device 75, which is a U-shaped spiral spring 76, which is two elastic interconnected side legs 77, 78. The side leg 77 is supported in its free end region on a support 79 which is formed or held by the movable pliers part 3. In this end region, the side leg 77 is additionally supported on a support 80 which is formed or supported by the fixed pliers part 2. The other side leg 78 is supported in an end region on a support 81 which is formed or held by the movable pliers part 3. In addition, the side leg 78 is supported on a support 82 which is formed or supported by the fixed pliers part 2. For this embodiment, the functioning of the crimping tool 1 is as follows:
In Fig. 12 the spring device 75 is supported between the two supports 80, 82 on the fixed pliers part 2 and thus caught. It is therefore a stable equilibrium. An actuation of the additional hand lever 49 causes the support 79 to take the side leg 77 with it, while the side leg 78 is still supported on the support 82. The spring device 75 is thus compressed and generates a closing spring force. During this movement caused by the additional hand lever 49, the side leg 77 detaches from the support 80 and the side leg 78 from the support 81. In the insertion and / or removal position brought about by the additional hand lever 49, one of the spring devices 75 thus acts generated closing spring force, which moves the movable jaw 6 back into the starting position Fig. 12 wants to move back. A workpiece 57 is thus also clamped here, provided the dimensions of the workpiece 57 are so large that clamping takes place with a position of the movable jaw 6 that is more open than in the starting position according to FIG Fig. 12 ,

If the actual press or crimp stroke is carried out by means of the movable hand lever 9, the support 61 also moves the side leg 78, so that the side leg 78 moves away from the support 82 releases. On the other hand, during the crimping or pressing stroke, the side leg 77 is supported on the support 80, while the support 79 moves away from the side leg 77. The spring device 75 thus generates an opening spring force during the pressing or crimping stroke, which, upon reaching the closed position, for an automatic opening movement into the starting position caused by the spring device 75 Fig. 12 can be used.

Also Fig. 13 shows an embodiment of the crimping tool 1, in which the drive mechanism 10 has no play 50. Basically, the actuation kinematics of the crimping pliers 1 according to Fig. 13 designed according to the previously described embodiments. In this case, however, the movable hand lever 9 has a lever part 83 which acts on a closing spring 36 for movement from the starting position into the insertion and / or removal position, while the lever part 83 for carrying out the pressing or crimping stroke from the starting position in the closed position acts on an opening spring 42. Here, the opening spring 42 and the closing spring 36 can each follow the lever part 83 on different sides by suitable stops only up to the starting position.

This in Fig. 14 The illustrated embodiment of the crimping pliers 1 basically corresponds to that in 1 to 9 illustrated embodiment. However, here the further lever 48 is not designed as an additional hand lever 49, which is arranged between the two hand levers 5, 9. Rather, for this exemplary embodiment, the further lever 48 extends outside the space between the two hand levers 5, 8. For the illustrated exemplary embodiment, the further lever 48 extends upward out of a housing of the crimping pliers 1 formed with the fixed pliers partial plates 17. It is possible that in this case the further lever 48 is arranged and designed such that actuation of the further lever 48 by a finger, in particular a thumb of the hand, is possible for the user's hand placed on the fixed hand lever 5.

For that in 1 to 9 The illustrated embodiment was for a storage position of the movable hand lever 9 in its open position. This requires a relatively large installation space for stocking the crimping tool 1. If this is to be avoided, a locking or locking of the movable hand lever 9 in the closed position (or also in another position) can be possible with an otherwise corresponding configuration, the locking position then being exerted by the user with sufficient actuation forces on the Movable hand lever 9 can be left or with an unlocking of a locking device due to the action of the opening spring, the movable hand lever 9 is automatically transferred to the open position.

LIST OF REFERENCE NUMBERS

1

Crimping Tool

2

fixed pliers part

3

movable pliers part

4

fixed jaws

5

fixed hand lever

6

movable jaw

7

Swivel bearing (fixed pliers part - movable pliers part)

8th

Swivel bearing (movable hand lever - fixed pliers part)

9

movable hand lever

10

drive mechanism

11

Knee lever drive

12

pressure lever

13

Toggle lever

14

Toggle lever (hand lever)

15

knee

16

Swivel bearing (pressure lever - movable pliers part)

17

fixed pliers section plate

18

movable pliers section plate

19

fixed hand lever part

20

Swivel pin (swivel bearing 7)

21

Swivel pin (swivel bearing 8)

22

Swivel pin (swivel bearing 16)

23

Swivel pin (knee joint 15)

24

Elongated hole (for pivot pin 23 in pliers section plate 17)

25

Elongated hole (for pivot pin 22 in pliers section plate 17)

26

movable hand lever plate

27

support plate

28

fastening area

29

Collet jaw plate

30

mounting bolts

31

mounting bolts

32

Zwangsgesperre

33

locking teeth

34

locking member

35

Spring (forced locking)

36

closing spring

37

Spring base point (closing spring 36; supported on fixed pliers part 2)

38

Bolt (support spring base point 37)

39

Spring base point (closing spring 36; supported on movable pliers part 3)

40

Bolt (support spring base point 39)

41

Slot (for bolt 40)

42

opening spring

43

Spring base point (opening spring 42; supported on fixed pliers part 2)

44

Bolt (support spring base point 43)

45

Spring base point (opening spring 42; supported on movable hand lever 9)

46

Bolt (support spring base point 45)

47

Slot (for bolt 46)

48

another lever

49

Additional hand lever

50

game

51

Elongated hole (pressure lever 12)

52

Stop (slot 51)

53

die

54

die

55

stock position

56

Insertion and / or removal position

57

workpiece

58

holding position

59

starting position

60

closed position

61

Cladding (movable pliers part plates)

62

web

63

Cladding (fixed pliers part plates)

64

securing eye

65

mechanical pliers part

66

Electronics assembly

67

housing part

68

housing part

69

cover plate

70

Display, ad

71

circuit board

72

bracket

73

battery

74

handle

75

spring means

76

bending spring

77

side leg

78

side leg

79

support

80

support

81

support

82

support

83

lever part

Claims (14)

Crimping pliers (1) with a) a fixed pliers part (2) with a fixed hand lever (5) and a fixed pliers jaw (4) and b) a movable hand lever (9) which is coupled via a drive mechanism (10) to a movable pliers jaw (6) in such a way that when the movable hand lever (9) is pivoted in the direction of the fixed hand lever (5), a closing movement of the pliers jaw ( 6) can be produced, with which a workpiece (57) can be crimped or pressed, characterized in that c) there is a further lever (48), the further lever (48) being coupled via a drive connection to the movable pliers jaw (6) in such a way that an opening movement of the pliers jaw (6) in when the further lever (48) is pivoted an insertion and / or removal position (56) can be brought about. Crimping pliers (1) according to claim 1, characterized in that the further lever (48) is an additional hand lever (49) which is arranged between the fixed hand lever (5) and the movable hand lever (9). Crimping or crimping pliers (1) according to claim 2, characterized in that the further lever (48) is coupled to the movable pliers jaw (6) via the drive connection in such a way that the further lever (48) is pivoted in the direction of the fixed hand lever (5) an opening movement of the jaw (6) can be brought about. Crimping or crimping pliers (1) according to one of the preceding claims, characterized in that the drive connection is a fixed connection of the further lever (48) to the movable pliers jaw (6). Crimping or crimping pliers (1) according to any one of the preceding claims, characterized in that an opening spring (42) is present, which on the movable jaw (6) and / or the movable hand lever (9) acts in such a way that the movable jaw (6) and / or the movable hand lever (9) are automatically moved from a closed position (60) in an opening direction. Crimping or crimping pliers (1) according to one of the preceding claims, characterized in that a closing spring (36) is present which acts on the movable pliers jaw (6) and / or the further lever (48) in such a way that the movable pliers jaw ( 6) is acted upon in the closing direction and / or the further lever (48) is automatically moved from a closed position towards an open position. Crimping or crimping pliers (1) according to claim 5 or 6, characterized in that a) the closing spring (36) is articulated with a spring base (37) on the fixed pliers part (2) and is articulated with the other spring base (39) on the movable pliers part (3), and / or b) the opening spring (42) is articulated with a spring base (43) on the fixed pliers part (2) and is articulated with the other spring base (45) on the movable hand lever (9). Crimping or crimping pliers (1) according to one of the preceding claims, characterized in that a) the drive mechanism (10), via which the movable hand lever (9) is coupled to the movable jaw (6), has a play (50) limited by a stop (52), b) during a pivoting of the movable hand lever (9) in the direction of the fixed hand lever (5) with a closing movement of the pliers jaw (6) into the closed position, a drive element of the drive mechanism (10) rests against the stop (52) for the transmission of a press or Crimping force and c) during a pivoting of the further lever (48) with an opening movement of the pliers jaw (6) into the insertion and / or removal position (56), the drive element moves away from the stop (52) using the play (50). Crimping or crimping pliers (1) according to claim 8, characterized in that the play (50) is at least so great that in an open position of the movable hand lever (9) depending on the position of the further lever (48), the movable pliers jaw ( 6) from the The closed position can be moved into the open position without the movable hand lever (9) leaving its open position. Crimping pliers (1) according to one of the preceding claims, characterized in that in an open position of the movable hand lever (9) a) the opening spring (42) exerts no opening spring force on the movable jaw (6) and b) the closing spring (36) exerts a closing spring force on the movable jaw (6), which is minimal in a closed position of the further lever (48) and maximum in an open position of the further lever (48). Crimping or crimping pliers (1) according to one of claims 8 to 10, characterized in that the drive mechanism (10) has an elongated hole (51) which provides the play (50), the stop (52) from an end region of the elongated hole (51) is formed. Crimping pliers (1) according to one of the preceding claims, characterized in that the drive mechanism (10) is a toggle lever drive (11). Pressing or crimping pliers (1) according to claim 12 in relation to claim 11, characterized in that the toggle lever drive (11) has a pivot pin (23) which is received in the elongated hole (51). Crimping or crimping pliers (1) according to one of the preceding claims, characterized in that there is a positive lock (37) which a) a movement of the movable jaw (6) caused by the further lever (48) does not block and b) a movement of the movable jaw (6) caused by the movable hand lever (9) blocks.

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