EP3614507B1 - Pressing or crimping tool - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to pressing or crimping pliers. The pressing or crimping pliers can be used to manually operate hand levers to press or crimp a workpiece.

• 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.

In this case, crimping pliers are used in particular to establish 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 die profile used, different crimping processes can be carried out with the crimping pliers. 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. It is also possible, however, to produce an open crimp in which the plug has an open crimp zone into which the conductor can be inserted from above. To name only 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 according 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 Werkzeugfabrik "Tools for professional use" with the publication no. 10/11 are described, be crimped. The crimp produced can be, for example, a hexagonal or hexagonal crimp, a square crimp, a B crimp, a trapezoid crimp, a modified trapezoid crimp, an oval crimp, a mandrel crimp or a two-mandrel crimp for a closed 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 making the electrical connection between the cable or conductor and plug, a mechanical connection can be made using what is known as an 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,
• on possible areas of application of the generic crimping pliers and / or
• to different possible types of crimp connections that can be made using the generic crimping pliers,
  is going to the work
• "Crimping 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

referenced. 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.

In contrast, a generic crimping tool is preferably used for the mechanical fluid-tight connection in fluid technology, for example for connecting pipes to one another or to fluidic connectors. In this case, plastic deformation of the pipes to be connected or a so-called fitting ensuring the mechanical connection and the fluid-tight seal takes place by means of the pressing tongs. Exemplary embodiments of a generic pressing tongs can be found in the publications 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 can be removed.

DE 10 2007 001 235 B4 discloses a non-generic pressing tongs in which the tong jaws are pivotably 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 area on a first pliers jaw. Finally, a third hand lever is arranged between the first hand lever and the second hand lever when the pliers jaws are in an open position. 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 pincer jaw. In the area of their crankings, the first hand lever and the third hand lever are coupled to one another via a pivotably articulated pressure lever, a pivot pin for coupling the pressure lever to the third hand lever being fixed on the first hand lever. To bring about a closing movement of the pincer jaws, the three hand levers in two successive partial closing strokes can use different toggle lever drives, 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 and the first hand lever and the third hand lever are fixed by the user's hands surrounding 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 lever. In this case, a second toggle lever drive engages the other gripper jaw. In this second toggle lever drive, a 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 tong jaws with different closing movements of a sub-combination of the three hand levers.

U.S. 3,688,553 relates to crimping pliers for crimping a fitting for a pipe system. A die having a circular cross-section in the closed state is made up of three Die parts formed, each delimiting a partial circumference of the circular cross section of the die. Two swivel jaws, which are pivotably mounted on a pliers head designed with housing plates, form a first and a second die part, these die parts each forming a four-part part of the die, which is circular in the closed state. The third die part, which forms a semicircle of the circular cross section of the die in the closed state, is provided by a push rod. For a first embodiment of the pressing tongs, two hand levers are articulated in their end areas via a pivot pin on the push rod. At a distance from this articulation, end regions of pull tabs are also articulated to the hand levers, the other end regions of which are in turn articulated to the housing plates of the pliers head. By pivoting the hand levers towards one another, a movement of the push rod in the closing direction of the die can thus be brought about. The slide rod has operating surfaces which are inclined with respect to the sliding direction of the slide rod. Rollers mounted on the end areas of the press jaws roll on these actuating surfaces. The sliding movement of the slide rod brought about by the closing movement of the hand lever thus leads, on the one hand, to the movement of the third die part formed by the slide rod in the sliding and closing direction and, via the actuation by the actuating surfaces of the sliding rod and the rolling contact of the rollers with the actuating surfaces, to the closing movement of the press jaws. The position of the actuating surfaces is chosen so that the fitting is initially pressed into an elongated cross-section through the pressing jaws and only when the pressing jaws reach the closed position does the die part formed by the slide rod come into operative connection with the fitting and the previously created elongated cross-section of the Fittings pressed into the intended circular cross-section. For a second embodiment, the actuating surfaces of the slide rod are not used and thus no actuation of the pressing jaws via the contact of rollers of the pressing jaws with the actuating surfaces, so that by pivoting the hand levers towards each other, only the third die part formed by the push rod is actuated. For this embodiment there is a third hand lever which is angled in the end area arranged in the pliers head. In the area of the bend, the third hand lever is linked to a press jaw via a pivot pin. The free end area of the angled portion is pivotably connected to an actuating bracket via a pivot pin. The actuating tab is in turn hinged to the other press jaw in the other end area via a pivot pin. The pivot pin coupling the third lever to the actuating tab is guided in an elongated hole in the slide rod. For going through a working stroke to press a fitting both hand levers and the third hand lever are opened, with which the fitting can be inserted into the jaws of the crimping pliers. The third hand lever is then closed while the two hand levers are still open. The closing movement of the third hand lever has the consequence that the pressing jaws are closed and the fitting is deformed into an elongated pressed state. In the closed position of the third hand lever, the closed position reached by the third hand lever is self-locking. The two hand levers can now be pivoted, with which the slide rod moves and the fitting is deformed to the intended circular cross-section through the end face of the slide rod.

The closest prior art DE 693 19 628 T2 (Member of the patent family of EP 0 725 708 ) discloses a crimping tool with a fixed pliers part, which forms a fixed hand lever and a fixed pliers jaw. In the area of the pliers head, a movable pliers jaw is mounted on the fixed pliers part via a pivot pin. A movement of the movable tong jaw in a closing direction can be brought about via a movable hand lever which is pivotably articulated in one end region on the movable tong jaw and is supported on the fixed tong part via a pressure lever forming a toggle drive. DE 693 19 628 T2 suggests that the pivotable articulation of the end region of the movable hand lever on the movable pliers jaw takes place by receiving a coupling bolt held on the movable hand lever in an approximately parabolic opening of the movable pliers jaw. The inclusion of the coupling bolt in the parabolic opening has the consequence that the connection between the movable pliers jaw and the movable hand lever can be released. The pivot pin of the movable hand lever is additionally supported by a pivot lever which is mounted pivotably about the pivot axis of the movable pliers jaw. An opening spring acts between the pivot lever and the movable tong jaw, which acts on the one hand on the movable hand lever in the opening direction and on the other hand on the movable tong jaw in the closing direction. If the hand levers are in the open position, the opening spring causes the connection between the movable pliers jaw and the coupling bolt of the hand lever in the area of the parabolic receptacle to be released and the movable pliers jaw to be acted upon in the closing direction. If manual opening forces are applied to the movable pliers jaw in this open position of the hand lever against the action of the opening spring, the pliers jaws formed by the two pliers jaws can be opened and a workpiece can be inserted into the pliers jaws. Is then the manual on the movable When the opening force applied by the tong jaw is eliminated, the opening spring closes the movable tong jaw, whereby the workpiece is clamped between the tong jaws as a result of the action of the opening spring. If the two hand levers are then moved towards one another, the coupling bolt enters the parabolic recess of the movable pliers jaw, with which the actual pressing of the workpiece can then take place by actuating the hand lever.

Further state of the art is off U.S. 5,012,666 A known.

The non-generic publication EP 0 860 245 A2 relates to a pressing device with an electric or hydraulic drive for pressing a pipe with a press fitting. The drive has a housing which, in the area of the center of gravity of the pressing device, forms a gripping surface that can be grasped by the user's hand. The pressing jaws are coupled to one another via a coupling rod, a coupling frictional connection or a coupling toothing in such a way that a manual pivoting of one pressing jaw in an opening direction is coupled with a corresponding pivoting of the other pressing jaw in the opening direction. In order to enable one-handed operation (with the user's hand encompassing the grip area of the housing) also for the manual transfer of the press jaws into the open position, a press jaw has an extension that can be acted upon directly by the thumb of the hand in order to move the press jaw (and thus also the other press jaw) to be transferred into the open position. In the event that the distance between the press jaw and the extension from the gripping surface is so great that the thumb cannot reach the extension, suggests EP 0 860 245 A2 propose to pivot an additional actuating lever on the housing, one end area of which can then be actuated by the user's thumb, while the other end area can act on the extension of the press jaw to move the press jaws into the open position.

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 is based on the object of proposing a manually operated crimping or crimping tool, which with regard to

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

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

SOLUTION

The object of the invention is achieved according to the invention with the features of the independent claim. Further preferred embodiments according to the invention can be found in the dependent 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 these have a fixed pliers part with a fixed hand lever and a fixed pliers jaw. Here, the fixed pliers part can be designed 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 pliers jaw via 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 tong jaw is such that a closing movement of the movable tong 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 pincer jaw, a workpiece is crimped or pressed between the fixed pincer jaw and the movable pincer jaw, in particular in the area of dies held or formed by the pincer jaws.

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

Within the scope 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 have the same pivoting or different pivoting movements with a fixed predetermined or structurally when one of the two levers is actuated experience given varying transmission ratio. However, it is also possible that the movement of the further lever is 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 pivoted at the same time (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 the 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 jaws in an insertion and / or removal position in which the insertion and / or removal of a workpiece is made possible or simplified.

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

Within the scope of the invention, the further lever can have any (for example, straight or cranked) shape and / or have any length.

For a first variant of the invention, the further lever is an additional hand lever which is arranged between the fixed hand lever and the movable hand lever. This design uses a space that is already present 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 pivot plane. It is possible that the end region of the additional hand lever facing away from the pliers head of the crimping pliers or crimping pliers lies in the region of the pivoting circle of the corresponding end region of the movable hand lever or lies outside or inside the same.

For a second variant of the invention, the further lever extends outside a space between the two hand levers and extends upward out of a housing of the crimping pliers formed with the fixed pliers part plates. The further lever is arranged and designed in such a way that an actuation of the further lever by a finger, in particular a thumb of the hand, is possible for the user's hand placed on the fixed hand lever.

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 pliers 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 so 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 intending to restrict the invention, a possible effect of this embodiment is explained using the following example: If the inner surface of one hand of the user is in contact with the outer surface of the fixed hand lever, the user can grip the additional hand lever with at least one finger and Swivel the additional hand lever in the direction of the fixed hand lever by the force of the at least one finger, with which the opening movement of the pliers jaws takes place and the insertion and / or removal position can be brought about and the workpiece can be inserted into 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 then to be brought about, the user takes the fingers off the additional hand lever and places them on the outside of the movable hand lever, while the inner surface of the hand continues to be supported on the outside of the fixed hand lever can. The user can then apply the necessary forces to the movable hand lever with his fingers in order to bring about the closing movement of the pliers jaws for crimping or pressing a workpiece.

According to the invention, the drive connection is a fixed connection between the additional hand lever and the movable pliers jaw. It is possible, for example, that the additional hand lever is designed as an integral component with the movable tong jaw or the additional hand lever and the movable tong jaw are designed as separate components that are directly or indirectly and detachable or non-detachable, but in any case with are connected to each other by a fixed connection. In this way, a structurally simple but reliable drive connection can be provided.

For a further suggestion, the 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 / is automatically moved from a closed position in 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 automatically open the movable pliers 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 crimping or crimping pliers.

It is also possible for the pressing or crimping pliers to have a closing spring. The closing spring acts on the movable tong jaw and / or the further lever in such a way that the movable tong jaw is acted upon in the closing direction and / or the further lever is automatically moved from a closed position in the direction of an open position. A closing spring force generated by the closing spring and acting on the moving pliers jaw in the closing direction can be used, for example, to act on the further 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 the closing spring force then acts on the movable pliers jaw in the closing direction. The workpiece is thus clamped between the two pliers jaws with the closing spring force, so that it can be fixed between the dies in the position and / or orientation previously brought about manually. Under certain circumstances, however, it is also possible for the workpiece to be readjusted for such a workpiece fixed in the dies between the tong jaws by the user pushing the workpiece into a different orientation and / or position, which then causes the tong jaws to spring open against the action of the closing spring or a frictional sliding movement of the workpiece against 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. Here, the at least one spring can be made from 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 one spring base point on the fixed pliers part, while it is articulated with the other spring base point on the movable pliers part. Alternatively or cumulatively, it is possible for the opening spring to be articulated with one spring base point on the fixed pliers part, while it is articulated with the other spring base point on the movable hand lever.

The invention also includes embodiments in which the opening spring and the closing spring are formed from a single integral spring element, see in particular the one not previously published European patent application EP 3 553 899 A1 .

The invention comprises embodiments in which the drive mechanism for coupling the movable hand lever to the movable pliers jaw is permanently effective, so that when the movable pliers jaw is moved by the further lever, the movable hand lever is also moved as a result of the coupling via the drive mechanism. For another embodiment of the crimping or crimping pliers, it is proposed that the drive mechanism, via which the movable hand lever is coupled to the movable pliers jaw, has play. The game is limited by a stop. By means of the stop and the play, 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 in the closed position, i.e. during the crimping or pressing of the workpiece, a drive element of the drive mechanism is on the Stop at what the game is not effective and a backlash-free transmission of the press or Crimping force can be done. If, on the other hand, the further lever is pivoted with an opening movement of the tong jaws into the insertion and / or removal position, the drive element moves in the direction of the stop, so that a movement takes place using the play. This has the consequence that for the opening movement to bring about the insertion and / or removal position by actuating the further lever, the movable hand lever is not moved along despite the opening movement of the pliers jaws, which under certain circumstances simplifies the operation of the crimping or crimping pliers.

The play can be dimensioned as desired, 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 moved hand lever depending on the position of the further lever and caused by this, the movable pliers jaw can be moved from the closed position to 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 pliers jaw. This closing spring force is minimal in a closed position of the further lever, while it is maximal in an open position of the further lever. Here, 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, so that it is always pretensioned. 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 with a sufficient closing spring force between the dies.

Under certain circumstances, by holding the workpiece by means of the closing spring force of the closing spring, the use of a so-called positioner or locator to ensure the correct position or orientation of the workpiece relative to the dies can be dispensed with within the scope of the invention.

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

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 that the play and the stop are provided in the toggle lever drive in that the toggle lever drive has a pivot pin, which can be a pivot pin of a joint for a toggle lever or a pivot pin to form the toggle joint. In this case, the pivot pin can be accommodated in an elongated hole, with the result that the required play and the stop can be provided.

For a further embodiment of the pressing or crimping pliers, it is proposed that these have a compulsory lock. Automatic locks are used to secure a closed position of the pliers jaws during the crimping or pressing of 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 pressing or crimping stroke - or crimping pliers are used. On the other hand, the automatic locking mechanism should enable the pressing or crimping pliers to be reopened when a closed position is reached. Within the scope of the invention, the effect and the design of the automatic locking mechanism can be specifically adapted to the requirements here as follows: The automatic locking mechanism here does not secure the position of the movable pincer jaw over the entire possible range of movement of the movable pincer jaw. Rather, the automatic locking mechanism does not block a movement of the movable pincer jaw caused by the further lever, while the automatic locking mechanism blocks a movement of the movable pincer jaw caused by the movable hand lever. In other words, the automatic lock is not effective if the removal and / or insertion position is to be brought about by actuating the further lever so that an opening movement is possible, while the automatic lock is intended to enable the closing movement for crimping or pressing a workpiece with simultaneous securing of a thereby reached closed position.

Advantageous further developments of the invention emerge from the patent claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are merely exemplary and can come into effect alternatively or cumulatively without the advantages necessarily having to be achieved by embodiments according to the invention. Without changing the subject matter of the attached 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 illustrated geometries and the relative dimensions of several components to one another and their relative arrangement and operative connection.

The number of features mentioned in the patent claims and the description are to be understood in such a way that precisely this number or a greater number than the number mentioned is present without the need for an explicit use of the adverb "at least". For example, when a spring is mentioned, it is to be understood that there is exactly one spring, two springs or more springs. These characteristics can be supplemented by other characteristics or be the only characteristics that make up the product in question.

The reference signs contained in the claims do not restrict the scope of the subject matter protected by the claims. They only serve the purpose of making the 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.

In the following, the invention is further explained and described with reference to preferred exemplary embodiments shown in the figures.

Fig. 1

shows a three-dimensional exploded view of a crimping tool.

Fig. 2

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

Figures 3 to 9

show the crimping tool according to Fig. 1 and 2 in different operating positions ( Fig. 3 : Stocking, Fig. 4 : Insertion position; Fig. 5 : Hold 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 : Pick-up position.

Fig. 10

shows a three-dimensional exploded view of a crimping tool according to FIG Figures 1 to 9 with additional electronics unit.

Figures 11 and 12

show a further embodiment of a crimping tool in a plan view in different partially dismantled states.

Fig. 13

shows a further embodiment of a crimping tool in a top view in a partially dismantled state.

Fig. 14

shows a further embodiment of a crimping tool in a top view in a partially dismantled state.

FIGURE DESCRIPTION

In the context of the present description of the figures, the same reference symbols are used for different embodiments in components which match or are similar in terms of geometries and / or functions. If an embodiment contains several components that correspond to one another in terms of function and / or geometry, these are in some cases identified with the same reference numerals, with a distinction then being made additionally with a), b), ... In this case, the reference symbols can then be used with or without the supplementary letter.

• 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 maximally in the direction of the fixed hand lever. A corresponding pivoting movement is referred to as a closing movement or a closing stroke. Conversely, an opening position and opening movement denote 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 characterizes the position in which the pliers jaws are maximally closed, that is to say a workpiece arranged in the dies is completely pressed or crimped. The closing movement here characterizes the movement in the direction of the closed position. An open position of the movable tong jaws denotes an open position of the tong jaws compared to the closed position, and the opening movement denotes the movement of the tong 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 open so wide that the pliers mouth formed with the dies is open so wide that a non-pressed or crimped workpiece can be inserted into the dies with play and a pressed or crimped workpiece can be removed from the dies with greater clearance,
• a storage position in which the opening of the pliers jaws is reduced compared to the insertion and / or removal position and which the crimping or crimping pliers assumes without acting forces and without a workpiece inserted into the dies (whereby the storage position of the pliers jaws but also the closed position of the pliers jaws can correspond) and
• an initial 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 the start of crimping or pressing of the workpiece, the dies due to the closing spring force on the Workpiece are pressed and fix this.

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

For that in the Figures 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 gripper part 3 has a movable gripper jaw 6.

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

A movable hand lever 9 is pivotably 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 are pivoted 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 tong jaws 4, 6 carry dies via suitable receptacles, with the receptacles and dies here corresponding to FIG U.S. Patent 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 in particular in Fig. 3 As can be seen, 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 pivotably connected to one another via a toggle joint 15. The toggle lever 14 is formed by the cranked material area of the movable hand lever 9 between the pivot bearing 8 and the toggle joint 15. The end region of the toggle lever 13 facing away from the knee joint 15 is articulated to the movable pliers part 3 via a pivot bearing 16.

As in particular in Fig. 3 As can be seen, the toggle levers 13, 14 in the storage position 55 form a knee angle 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 between 170 ° and 180 °, for example, so that with the closing movement, the knee angle approaches the extended position with the associated large 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. Aus diesem Grund ist der Schwenkbolzen 23 des Kniegelenks 15 durch die festen Zangenteilplatten 17a, 17b hindurchgeführt. Um die Bewegung des Schwenkbolzens 23 während der Betätigung des Kniehebeltriebs 11 nicht zu behindern, verfügen die festen Zangenteilplatten 17a, 17b über entsprechend der erforderlichen Bewegung des Schwenkbolzens 23 gekrümmte Langlöcher 24a, 24b. Entsprechend verfügen die festen Zangenteilplatten 17 auch über Langlöcher 25a, 25, um die Bewegung des Schwenkbolzens 22 während der Betätigung des Kniehebeltriebs 11 nicht zu behindern und die Bewegung des beweglichen Zangenteils 3 zu ermöglichen.
• 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 Bildung des Befestigungsbereichs 28 überlappen und die langen Schenkel des L parallel zueinander angeordnet sind. Die Zangenbackenplatten 29 sind von außen an die Tragplatten 27 angesetzt, so dass sich die Zangenbackenplatten 29 in derselben Ebene erstrecken wie die festen Zangenteilplatten 17a, 17b.
• 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.

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

• For the embodiment according to Figures 1 to 9 the gripper parts 2, 3 are each designed in a plate construction, here each with two plates, namely two fixed gripper part plates 17a, 17b and movable gripper part plates 18a, 18b. Here, the movable pliers part plates 18a, 18b are arranged directly adjacent to one another and are arranged between the two fixed pliers part plates 17a, 17b. While the movable pliers part plates 18a, 18b here have the same geometry (in particular external geometry and bore geometry), the fixed pliers part plates 17a, 17b for the illustrated embodiment differ in that the pliers part plate 17a forms a fixed hand lever part 19, while the fixed pliers part plate 17b does not fixed hand lever part is available.
• For that in the Figures 1 to 9 The illustrated embodiment are the pivot bearings 7, 8, 16 and the toggle joint 15 is each designed with a pivot pin 20, 21, 22, 23, which are each in suitable bores, allowing the degree of pivoting freedom on the components, which via the pivot bearing 7, 8 , 16 and the knee joint 15 are connected to one another, are held.
• For that in the Figures 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. For this reason, the pivot pin 23 of the knee joint 15 is passed through the fixed pliers part plates 17a, 17b. In order not to hinder the movement of the pivot pin 23 during the actuation of the toggle lever drive 11, the fixed pliers part plates 17a, 17b have according to the required movement of the Pivot pin 23 curved elongated holes 24a, 24b. Correspondingly, the fixed pliers part plates 17 also have elongated holes 25a, 25 in order 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 pliers part 3.
• For that in the Figures 1 to 9 In the illustrated embodiment, there are two movable hand lever plates 26a, 26b which are arranged directly adjacent to one another. The movable hand lever plates 26 extend in the same planes as the movable pliers part plates 18. The movable pliers part plates 18 and the movable hand lever plates 26 are each rigidly connected to one another. The same applies to the fixed pliers part plates 17.
• For that in the Figures 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 pliers part plates 17.
• For that in the Figures 1 to 9 In the illustrated embodiment, the movable pliers part plates 18a, 18b are designed in two pieces, which is explained by way of example for a movable pliers part plate 18a: The movable pliers 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 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, with the two short legs of the L overlapping to form the fastening area 28 and the long legs of the L being arranged parallel to one another. The tong jaw plates 29 are attached from the outside to the support plates 27, so that the tong jaw plates 29 extend in the same plane as the fixed tong part plates 17a, 17b.
• For the embodiment according to Figures 1 to 9 a positive locking mechanism 32 acts on the toggle lever drive 11. By means of the automatic locking mechanism 32, a position once reached by the movable pliers jaw 6 is to be secured against an opening during the press or crimping stroke, which takes place in individual stages of the automatic locking mechanism 32. Once the closed position of the movable tong jaw 6 has been reached, the locking effect of the positive locking mechanism 32 does not apply, so that the movable tong 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 via a spring 35 of the positive locking mechanism 32. Here, the geometry of the locking teeth 33 and the locking member 34 and the action of the spring 35 are coordinated so that the locking member 34 can be moved ratchet-like for a closing movement of the movable hand lever 9 along the locking teeth 23, while this locking for an opening movement of the movable hand lever 9 engages in the locking teeth 33. When the movable hand lever 9 reaches the closed position, the locking member 34 folds over so that another engagement surface of the locking member 34 interacts with the locking toothing 33, which enables the opening movement of the hand lever 9.
• For the embodiment according to Figures 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 by a spring base 37 on the fixed pliers part 2, here via a bolt 38 carried by the fixed pliers part 2. The other spring base 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 Figures 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 on the outside of the two fixed pliers part plates 17. The bolt 40 thus extends through elongated holes 41a, 41b of the fixed pliers part plates 17, which are arranged and shaped in such a way that they do not hinder the movement of the bolt 40 with the pivoting of the movable pliers part 3.
• For that in the Figures 1 to 9 In the illustrated embodiment, an opening spring 42 acts on the movable hand lever 9. 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 45 is supported on the movable hand lever 9, here via a bolt 46, which takes place eccentrically to the pivot axis of the pivot bearing 8 so that the opening spring 42 acts on the movable hand lever 9 in the opening direction.
• For that in the Figures 1 to 9 In the illustrated embodiment, there are two opening springs 42 which act in parallel on the movable hand lever 9 and are arranged outside the fixed pliers part plates 17. For this reason, the bolt 46 is passed through elongated holes 47a, 47b of the fixed pliers part plates 17a, 17b, which are arranged and shaped in such a way that they do not hinder the pivoting of the movable hand lever 9. When the movable hand lever 9 is in the open position, the bolt 46 can come to rest against an end region of the elongated hole 47, whereby the open position of the movable hand lever 9 is predetermined and further opening of the movable hand lever 9 is impossible.
• For the in Figures 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 designed as a rod-like, for example slightly curved, extension of the movable pliers part plates 18. The additional hand lever 49 is arranged between the fixed hand lever 5 and the movable hand lever 9, with its pivoting range, for example, at least by a factor of 2, at least by a factor of 3, at least by a factor of 4, at least by 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 in the middle 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 pivoting circle segment of the end region of the additional hand lever 49 lies within the pivoting 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 grasped 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 understands that, depending on the length of the additional hand lever 49, the number of fingers that can be used to operate 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 uniquely 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 unambiguous assignment, a play 50 is provided in the drive mechanism 10, here the toggle lever drive 11. For the illustrated embodiment, the game 50 is provided that the toggle levers 13, 14 are not only coupled to one another in the area of the knee joint 15 via a degree of pivoting freedom, but that the toggle levers 13, 14 in the area of the knee joint 15 also have a degree of displacement exhibit. For this purpose, the toggle levers 13, here the pressure lever 12, have an elongated hole 51 in the area of the toggle lever 14, in which the pivot pin 23 is displaceably guided. The length of the elongated hole 51 determines the game 50. One end region of the elongated hole 51 forms a stop 52 for the pivot pin 23 of the toggle lever drive 11. During the pressing or crimping stroke, the pivot pin 23 rests 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 Figures 1 to 9 illustrated embodiment is now based on the different in Figures 3 to 9 The operating positions of the crimping pliers 1 shown here are explained:
Fig. 3 shows the crimping pliers 1 without operating 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 jaws are open. This closed position correlates with an open position of the additional hand lever 49. The closing spring 36 is in the state 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 tong jaws 4, 6 would correlate with the closed position of the movable hand lever 9. However, since the game 50 is provided here by 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 also has the Opening spring 42 has a minimum opening spring force acting in the opening direction. The operating position according to Fig. 3 can also be referred to as storage position 55.

From the supply position 55 according to Fig. 3 can an insertion and / or removal position 56 according to Fig. 4 be brought about. For this purpose, the additional hand lever 49 is manually pivoted out of its open position according to FIG Fig. 3 in its closed position according to 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 open position, namely the insertion and / or removal position 56. As a result of the play 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. The pivoting of the additional hand lever 49 increases the closing spring force of the closing spring 36. Since the movable 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 brought about in this way.

If the manual forces applied manually to the additional hand lever 49 are eliminated, the action of the closing spring 36 results in an automatic movement of the additional hand lever 49 in the opening direction, which is accompanied by a closing movement of the movable pliers part 3. This closing movement takes place until a holding position 58 according to FIG Fig. 5 is reached. In the holding position 58, the closing spring force exerted by the closing spring 36 on the movable pliers part 3 is supported by the fact that the workpiece is clamped between the pliers jaws 4, 6 or between the dies 53, 54. This clamping as a result of the closing spring force secures 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 for holding position 58 according to Fig. 5 the closing spring force of the closing spring 36 has decreased, and even when a small workpiece 57 is used, due to the design of the closing spring 36, it is still large enough to ensure that the position and / or orientation of the workpiece 57 is maintained. The opening spring force of the opening spring 42 is still 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 part of the way along the elongated hole 51, the pivot pin 23 still being arranged at a distance from the stop 52 of the elongated hole 51. The remaining distance depends on the Pivot pin 23 from the stop 52 on the size of the workpiece 57 in the unpressed or uncrimped state.

The user can now apply actuating forces to the movable hand lever 9. From the holding 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 between the pivot pin 23 and the stop 52 is overcome in the idle stroke, so that the pivot pin 23 comes to rest against the stop 52 at the end of the idle stroke. An initial position 59 is thus reached, which is shown in FIG 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 has to 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 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 press or crimp stroke. Rather, the pivot pin 23 rests against the stop 52 for the purpose of power transmission in the toggle lever drive 11, a pivoting movement still being possible in the area of the stop 52 and the knee joint 15 provided therewith. During the press or crimp stroke, as a result of the pivoting of the movable hand lever 9, the opening spring 42 is further applied the dies 53, 54 pressed or crimped.

If the manual 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 due to the action of the closing spring 36, whereby 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 Fig. 7 in the open position according to Fig. 8 he follows. During this movement, the play 50 of the drive mechanism 10 is used. For the exemplary embodiment shown, 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 movable pliers part 3 and the movable pliers jaw 6 can be transferred into the insertion and / or removal position 56 by actuating the additional hand lever 49 (cf. Fig. 9 ).

If a self-locking mechanism 32 is present in the crimping pliers 1, this produces a locking effect exclusively during the idle stroke and / or the pressing or crimping stroke, so that the other, previously described movements are not hindered by the self-locking mechanism 32.

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

For the in Figures 1 to 9 The illustrated embodiment, the crimping pliers 1 only has a mechanical pliers part 65. For a modified embodiment, the crimping pliers 1 according to FIG Fig. 10 in addition to the mechanical pliers part 65 via an electronics module 66. The design of the electronics module 66, its functions, its coupling with the mechanical pliers part 65 and / or its power supply and its wireless or wired communication can / can correspond to that not previously published European patent application EP 3 572 188 A1 be designed, 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, it being possible for a transparent cover plate 69 to form a viewing window for a display or a display 70 to be arranged in a housing part 67, 68. 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 with one another and with the fastening eyes 64 by means of suitable connecting pins and receptacles.

For an electrical power supply to the electronic component 66, the latter can have a holder 72 with a battery or a rechargeable accumulator 73. For the illustrated embodiment, the bracket 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 Figures 1 to 9 has been shown, although this is not necessary here for the purely mechanical design of the crimping pliers 1. It is possible that a handle 74 is 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 releasable connection by pressing a push button to unlatch the handle 74 can, which can be arranged, for example, on the inner side facing the other hand lever 9. The removal of the handle 74 can be used to replace a battery or an accumulator 73.

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

Deviating from Figures 1 to 9 are in for that Fig. 11 and 12th The illustrated embodiment also the closing spring 36 and the opening spring 42 designed differently and integrated into the crimping tool 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, the two elastic having interconnected side legs 77, 78. The side limb 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 area, the side leg 77 is also supported on a support 80 which is formed or supported by the fixed pliers part 2. The other side limb 78 is supported in one 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 pliers 1 is changed as follows:
In Fig. 12 the spring device 75 is supported between the two supports 80, 82 on the fixed pliers part 2 and is thus caught. It is therefore a stable equilibrium position. An actuation of the additional hand lever 49 results in the support 79 taking the side leg 77 with it, while the side leg 78 continues to be 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 is released 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, a spring device 75 acts generated closing spring force, which the movable pliers jaw 6 back to the starting position according to Fig. 12 want to move back. Thus, a workpiece 57 is also clamped here, provided the dimensions of the workpiece 57 are so large that clamping takes place with the movable gripper jaw 6 in a position that is wider 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 moves the side leg 78 with it, so that the side leg 78 detaches from the support 82. In contrast, the side limb 77 is supported on the support 80 during the crimping or pressing stroke, while the support 79 moves away from the side limb 77. The spring device 75 thus generates an opening spring force during the press or crimp stroke which, when the closed position is reached, for an automatic opening movement caused by the spring device 75 into the starting position according to FIG Fig. 12 can be used.

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

This in Fig. 14 The illustrated embodiment of the crimping tool 1 basically corresponds to that in Figures 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 exemplary embodiment shown, the further lever 48 extends upward out of a housing of the crimping pliers 1 formed with the fixed pliers part plates 17. It is possible that the further lever 48 is arranged and designed in this case in such a way 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 the in Figures 1 to 9 The illustrated embodiment was for a supply position of the movable hand lever 9 in its open position. This requires a relatively large amount of installation space for stocking the crimping pliers 1. If this is to be avoided, a latching or locking of the movable hand lever 9 in the closed position (or in another position) can be possible with an otherwise appropriate configuration, the latching position then being exited by the user applying sufficient actuation forces to the movable hand lever 9 can or with an unlocking of a locking device as a result of the action of the opening spring, the movable hand lever 9 is automatically transferred into the open position.

REFERENCE LIST

1

Crimping tool

2

fixed pliers part

3

movable pliers part

4th

fixed jaws

5

fixed hand lever

6th

movable jaws

7th

Swivel bearing (fixed tong part - movable tong part)

8th

Swivel bearing (movable hand lever - fixed pliers part)

9

movable hand lever

10

Drive mechanism

11

Toggle lever drive

12th

Pressure lever

13th

Knee lever (pressure lever)

14th

Knee lever (hand lever)

15th

Knee joint

16

Swivel bearing (pressure lever - movable pliers part)

17th

fixed pliers part plate

18th

movable pliers part plate

19th

fixed hand lever part

20th

Pivot pin (pivot bearing 7)

21

Pivot pin (pivot bearing 8)

22nd

Pivot pin (pivot bearing 16)

23

Pivot pin (knee joint 15)

24

Oblong hole (for pivot pin 23 in pliers part plate 17)

25th

Oblong hole (for pivot pin 22 in pliers part plate 17)

26th

movable hand lever plate

27

Support plate

28

Attachment area

29

Tong jaw plate

30th

Fastening bolts

31

Fastening bolts

32

Compulsory lock

33

Locking teeth

34

Locking member

35

Spring

36

Closing spring

37

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

38

Bolt (support spring base 37)

39

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

40

Bolt (support spring base 39)

41

Oblong hole (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 (opening spring 42; supported on movable hand lever 9)

46

Bolt (support spring base point 45)

47

Oblong hole (for bolt 46)

48

another lever

49

Additional hand lever

50

game

51

Elongated hole (pressure lever 12)

52

Stop (elongated hole 51)

53

Die

54

Die

55

Provisioning

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

Fastening eyelet

65

mechanical pliers part

66

Electronics assembly

67

Housing part

68

Housing part

69

Cover panel

70

Display, display

71

circuit board

72

bracket

73

battery

74

Handle

75

Spring device

76

Spiral spring

77

Side thighs

78

Side thighs

79

Support

80

Support

81

Support

82

Support

83

Lever part

Claims (12)

1. Pressing or crimping pliers (1) comprising

   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 by a driving mechanism (10) to a movable pliers jaw (6) in a way such that it is possible to induce a closing movement of the pliers jaw (6) by a pivoting movement of the movable hand lever (9) towards the fixed hand lever (5), a workpiece (57) being crimped or pressed with the closing movement of the pliers jaw (6),

   c) an additional lever (48) being provided and the additional lever (48) being coupled by a driving connection to the movable pliers jaw (6) in a way such that it is possible to induce an opening movement of the pliers jaw (6) into an insertion and/or removal position (56) by a pivoting movement of the additional lever (48), the driving connection being a fixed connection of the additional lever (48) to the movable pliers jaw (6),
   characterised in that

   d) the additional lever (48) is arranged in the region which is accessible for a hand which surrounds or encloses the fixed hand lever (5) and/or the movable hand lever (9) or in the region which is accessible for a finger of this hand where

   da) the additional lever (48) is an additional hand lever (49) which is arranged between the fixed hand lever (5) and the movable hand lever (9) or

   db) the additional lever (48) extends outside from the interspace between the two hand levers (5, 8) and extends in upward direction from a housing of the crimping pliers (1) formed by fixed pliers plate parts (17), the additional lever (48) being designed and arranged such that when the hand of the user is positioned on the fixed hand lever (5) an actuation of the additional lever (48) is possible by a finger, in particular a thumb of the hand.
2. Pressing or crimping pliers (1) of claim 1, characterised in that the additional lever (48) is coupled by the driving connection to the movable pliers jaw (6) in a way such that with a pivoting movement of the additional lever (48) towards the fixed hand lever (5) it is possible to induce an opening movement of the pliers jaw (6).
3. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that an opening spring (42) is provided which biases the movable pliers jaw (6) and/or the movable hand lever (9) in a way such that the movable pliers jaw (6) and/or the movable hand lever (9) are automatically moved from a closed position (60) in opening direction.
4. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that a closing spring (36) is provided which biases the movable pliers jaw (6) and/or the additional lever (48) in a way such that the movable pliers jaw (6) is biased in closing direction and/or the additional lever (48) is automatically moved from a closed position towards an open position.
5. Pressing or crimping pliers (1) of claim 3 or 4, characterised in that

   a) the closing spring (36) is linked by one spring base (37) to the fixed pliers part (2) and by the other spring base (39) to the movable pliers part (3) and/or

   b) the opening spring (42) is linked by one spring base (43) to the fixed plies part (2) and by the other spring base (45) to the movable hand lever (9).
6. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that

   a) the driving mechanism (10) by which the movable hand lever (9) is coupled to the movable pliers jaw (6) comprises a play (50) which is limited by a stop (52),

   b) during a pivoting movement of the movable hand lever (9) towards the fixed hand lever (5) with a closing movement of the pliers jaw (6) into the closed position a driving element of the driving mechanism (10) contacts the stop (52) for transmitting a pressing or crimping force and

   c) during a pivoting movement of the additional lever (48) with an opening movement of the pliers jaw (6) into the insertion and/or removal position (56) the driving element moves towards the stop (52) by use of the play (50).
7. Pressing or crimping pliers (1) of claim 6, characterised in that as a minimum the play (50) is dimensioned such that in an open position of the movable hand lever (9) it is possible to move the movable pliers jaw (6) from the closed position into the open position dependent on the position of the additional lever (48), the movable hand lever (9) remaining in its open position.
8. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that in an open position of the movable hand lever (9)

   a) the opening spring (42) does not apply an opening spring force upon the movable pliers jaw (6) and

   b) the closing spring (36) applies a closing spring force upon the movable pliers jaw (6), the closing spring force having a minimum in a closed position of the additional lever (48) and having a maximum in an open position of the additional lever (48).
9. Pressing or crimping pliers (1) of one of claims 6 to 8, characterised in that the driving mechanism (10) comprises an elongated hole (51) which provides the play (50), the stop (52) being provided by an end region of the elongated hole (51).
10. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that the driving mechanism (10) is a toggle lever drive (11).
11. Pressing or crimping pliers (1) of claim 10 when referring back to claim 9, characterised in that the toggle lever drive (11) comprises a swivel pin (23) which is accommodated in the elongated hole (51).
12. Pressing or crimping pliers (1) of one of the preceding claims, characterised in that a forced locking unit (37) is provided which

    a) does not block a movement of the movable pliers jaw (6) caused by the additional lever (48) and

    b) blocks a movement of the movable pliers jaw (6) caused by the movable hand lever (9).

Images