Method for assembling a pincer actuation assembly, pincer actuation assembly and pincer

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a pair of pliers that can be held and guided by a user by hand and is manually operated by a user applying forces to the hand lever of the pliers.

[0002] There are the following variants for the design of the pliers: a) It is possible that the pliers are crimping pliers, which are used in particular to create a permanent mechanical connection and electrical contact. This is preferably done by crimping a plug to a cable or an electrical conductor of any design. Depending on the profile of the dies used, different crimping processes can be carried out with the crimping pliers or the crimping machine. 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 crimped by plastic deformation of the crimp zone or the sleeve. However, it is also possible for an open crimp to be created, in which the plug has an open crimp zone into which the conductor can be inserted from above.To name just a few non-limiting examples, the crimping pliers in question can be used to crimp workpieces such as cable lugs according to DIN 4623, aluminum connectors 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 connecting to a cable or conductor, as described in the WEZAG GmbH Werkzeugfabrik product catalog "Tools for Professional Use" with publication no. 10 / 11. The crimp produced can be, for example, a closed crimp, a 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.In addition to establishing the electrical connection between the cable or conductor and the connector, a mechanical connection can be created using a so-called insulation crimp. A closed insulation crimp or an open insulation crimp (in particular, a V-crimp, B-crimp, O-crimp, or OV-crimp) can be used. For further information on the design of crimping pliers, possible applications of the crimping pliers, and / or different types of crimp connections that can be created using the crimping pliers, please refer to the book "Crimp Technology: Production of Process-Reliable Connections of Electrical Conductors and Connectors" by WEZAG GmbH Werkzeugfabrik, Die Bibliothek der Technik 342, Verlag Moderne Industrie, ISBN 978-3-68236-027-7.Crimping pliers in various designs are known, 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. b) It is also possible that the pliers are pipe pressing pliers, which are used to create a mechanical, fluid-tight connection in fluid technology, for example, for connecting pipes to one another or to fluidic connectors. In this case, the pipe pressing pliers plastically deform the pipes to be connected or a so-called fitting, which ensures the mechanical connection and the fluid-tight seal. Exemplary embodiments of a pipe pressing pliers 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.

[0003] The invention also relates to a pliers actuating assembly which can be coupled to a pliers head to form a pair of pliers in such a way that a stroke of die halves of the pliers head can be brought about by means of a manual actuation of the pliers actuating assembly.

[0004] Furthermore, the invention relates to a method by means of which a pliers actuation group can be assembled. STATE OF THE ART

[0005] DE 100 569 00 C1 discloses a crimping pliers assembly comprising a crimping pliers actuating assembly and a crimping pliers head. The crimping pliers actuating assembly has two hand levers pivotally connected to each other via a pivot pin. A pull tab is hinged to each hand lever at a distance from the pivot pin. The crimping pliers actuating assembly has a positive locking mechanism, by means of which, once a crimping stroke has been completed, the partially closed position of the hand levers is secured in a ratchet-like manner, and an opening movement of the hand levers is only permitted at the end of the crimping stroke. The crimping pliers head has a pliers head frame to which a fixed die half is fixed and a movable die half is guided for displacement in the direction of a crimping axis.The movable die half is supported on the pliers head frame via a spring device such that the spring device urges the die half in an opening direction. The pliers head frame has frame plates extending parallel to one another, between which the fixed die half is held and the movable die half is guided. For mounting the crimping pliers actuating assembly on the crimping pliers head, the movable die half has a U-shaped pivot pin receptacle open on one side in the direction of the pivot pin of the crimping pliers actuating assembly. Furthermore, the pliers head frame has pull-tab coupling devices which have through-holes in the frame plates oriented vertically to the pliers head plane. The pull-tabs each have a through-hole oriented vertically to the pliers head plane in the end area facing away from the articulation to the hand lever.For assembly, the crimping tool actuation assembly is brought closer to the crimping tool head so that the pivot pin, which pivotally connects the hand levers, enters the pivot pin receptacle. At the same time, the pull tabs are pivoted between the frame plates so that the holes in the frame plates are aligned with the holes in the pull tabs. Coupling bolts or rivets are then inserted into the aligned holes. In the assembled state, the crimping tool head, together with the frame plates and the pull tabs arranged therein, is captured between the heads of the coupling bolts and a locking ball of the coupling bolt.Aside from the pivot pin, which connects the two hand levers so that they can be pivoted together, a cross pin is held on one hand lever and extends into an elongated hole in the other hand lever. This elongated hole is curved in such a way that the elongated hole extends concentrically to the pivot axis defined by the pivot pin. The maximum opening angle of the hand lever is determined by the cross pin coming to a stop against one end of the elongated hole. The crimping pliers have a positive locking mechanism. The positive locking mechanism ensures that the hand levers remain partially closed during an opening movement, even if the manual forces applied to the hand levers by the user are temporarily reduced or eliminated. This also ensures that the die halves are in contact with the workpiece and prevents unwanted relative movement of the workpiece in the die halves.The positive locking mechanism ensures that the hand levers, and thus the die halves, can only open once the hand levers have reached a closed position. The positive locking mechanism features a pawl rotatably mounted on the hand levers. The pawl is actuated by a spring, which is connected to a corresponding hand lever by a spring base. The spring is designed as a spiral tension spring with open wire loops at its ends that can be hooked into holes in the hand lever and pawl that are oriented vertically to the pivoting plane of the hand levers.

[0006] A crimping pliers with corresponding assembly is known from EP 2 463 969 A2.

[0007] EP 2 834 989 A1 discloses a hand-held pliers tool, which can be a crimping pliers, a pipe pressing pliers, or a cutting pliers. In order to reduce the number of components of the hand-held pliers tool and simplify assembly and disassembly, EP 2 834 989 A1 proposes that a pliers pivoting part, which is a pliers jaw part, a pawl, or a pressure lever, has a plate-shaped base body that is received and guided between two cheeks of a hand lever or a fixed pliers jaw part. A pivot pin is formed integrally with the base body of the pliers pivoting part and has aligned pins arranged on both sides of the base plate. The pivot pin is received in a receptacle formed by the cheeks for the purpose of forming a pivot bearing.To enable the assembly of the pliers pivoting part with the hand lever forming the jaws or the fixed pliers part, the hand lever or the fixed pliers part forms a bearing eyelet in the form of a closed-edged bore for one pin and a bearing eyelet accessible via an insertion slot for the other pin. For assembly, a pin can be inserted into the closed-edged bearing eyelet, while the pliers pivoting part is then pivoted into the open-edged bearing eyelet via the insertion slot.

[0008] Further prior art is known from EP 0 303 889 A2. OBJECT OF THE INVENTION

[0009] The present invention is based on the object of proposing a method for assembling a pliers actuation assembly, which with regard to the number of components of the pliers actuation assembly and / or the assembly and / or disassembly and / or the enabling of at least partially automated assembly is improved. Furthermore, the invention is based on the object of proposing a correspondingly improved pliers actuation assembly and a correspondingly improved pliers. SOLUTION

[0010] The object of the invention is achieved according to the invention with the features of the independent patent claims. Further preferred embodiments of the invention can be found in the dependent patent claims. DESCRIPTION OF THE INVENTION

[0011] The object underlying the invention is achieved by a method for assembling a pliers actuation assembly. This pliers actuation assembly can be coupled to a pliers head to form a pair of pliers in such a way that a stroke of the die halves of the pliers head can be brought about by manual actuation of the pliers actuation assembly.

[0012] The pliers actuating assembly to be assembled according to the invention has two hand levers. At least one of the hand levers has two hand lever plates that are rigidly connected to each other (for the fully assembled pliers actuating assembly). The two hand levers are pivotally connected to each other via a pivot pin.

[0013] The pliers actuating assembly to be assembled according to the invention can have a positive locking mechanism that secures a partially closed position of the hand lever against an opening movement and only enables an opening movement when the hand lever reaches a closed position. The positive locking mechanism can then have a pawl pivotally mounted on a hand lever. The pawl is actuated by a spring. A spring base of the spring is supported on the hand lever on which the pawl is mounted. In this respect, the pliers actuating assembly to be assembled according to the invention can also be designed, for example, according to the aforementioned prior art DE 100 569 00 C1.

[0014] In the pliers actuating assembly to be mounted according to the invention, the pawl of any positive locking mechanism, the spring of any positive locking mechanism and / or at least one pull tab, via which the pliers actuating assembly can be coupled to the pliers head, have / has shoulders and projections arranged in front of the shoulders.

[0015] The shoulders and extensions can be advantageously used in the method according to the invention as follows: In the method according to the invention, assembly takes place by joining the pawl, the spring and / or the pull tab in a joining direction into a hand lever plate. The joining direction is oriented in particular vertically to the main extension plane of the hand lever plate. With this joining, an extension of the pawl, the spring and / or the pull tab enters a receptacle in the hand lever plate. The receptacle is a receptacle that passes through the hand lever plate or a blind hole-like receptacle. The cross-section of the receptacle is closed at the edge for the pliers actuation assembly according to the invention, whereas the cross-section of the receptacle for the method according to the invention can be closed at the edge or open at the edge. Preferably, the receptacle is a through-hole in the hand lever plate.At the end of the aforementioned joining movement and the entry of the extension into the receptacle, a shoulder of the pawl, spring or pull tab adjacent to the extension comes into contact with the hand lever plate in the joining direction, thus already providing an axial fixation or a stop for the position of the pawl, spring and / or pull tab in the joining direction. The cross-sections of the extension on the one hand and the receptacle on the other hand can be selected such that rotation of the extension in the receptacle is possible, thus ensuring a relative pivoting movement of the pawl, spring and / or pull tab with respect to the hand lever plate. It is also possible for the receptacle of an extension in a receptacle to form a spring base for supporting the spring.

[0016] After the aforementioned joining step, the other hand lever plate is joined in the same joining direction, thus joining the hand lever plate to the pawl, spring, and / or pull tab. During this joining movement, the other extension of the pawl, spring, and / or pull tab enters a receptacle in the other hand lever plate. The above applies accordingly to the design of the receptacle. At the end of this joining movement, a shoulder of the pawl, spring, and / or pull tab comes into contact with the other hand lever plate.

[0017] In a subsequent assembly step, the relative position of the hand lever plates is fixed, which can be achieved by screwing the hand lever plates together, riveting the hand lever plates, or any other secure connection. When the relative position of the hand lever plates is fixed, the shoulders of the pawl, spring, and / or pull tab are trapped between the two hand lever plates. This secures the pawl, spring, and / or pull tab against disassembly from the relatively fixed hand lever plates.

[0018] In the event that the spring has extensions and shoulders, the assembly according to the invention represents a significant simplification of the assembly process for connecting the spring base points of the spring, as the delicate threading of a spring eyelet into the pawl and / or the hand lever plate, which requires a high degree of manual dexterity, is no longer necessary. Instead, a simple axial joining of the spring in the area of ​​the extension in the previously mentioned joining direction can be carried out. The design of the pawl and / or the pull tab with the extensions and shoulders also results in simplified assembly, in which (to put it simply) only the extensions need to be inserted into the associated receptacles. Nevertheless, a very reliable and robust connection is ensured, which, if necessary, also guarantees the required degree of pivoting freedom.

[0019] According to the invention, the spring, the locking pawl and / or the pull tab are formed integrally with the extensions and the recesses, which on the one hand makes it possible to avoid additional assembly steps and on the other hand makes it possible to reduce the number of components.

[0020] It is possible for the assembly and / or joining to be carried out manually, in which case this manual assembly is simplified as explained. For a further proposal of the invention, at least partially automated assembly takes place. Under certain circumstances, only the explained joining of the pawl, the spring and the pull tab in the explained joining direction into one hand lever plate and the subsequent joining of the other hand lever plate in the same joining direction enables automated assembly, in which the pawl, the spring or pull tab is gripped by a handling element moved by an actuator and then inserted into the hand lever plate in the joining direction. Subsequently, the same handling element or another handling element actuated by the same or a different actuator can then join the other hand lever plate.For example, the first-mentioned hand lever plate can rest on an assembly table, and the pawl, spring, and / or pull tab can then be inserted vertically from above in the joining direction, followed by the installation of the other hand lever plate, also from above. At least partially automated assembly was not possible (or only with unreasonable effort) for pliers actuation assemblies known from the prior art. For example, according to the prior art, the automatic insertion of spring eyelets of a spring into bores in the pawl and / or the hand lever plate, which are oriented vertically to the pivoting plane of the hand lever, can only be achieved with considerable automation effort.

[0021] A further solution to the problem underlying the invention is a pliers actuating assembly with the design features already described above. The pliers actuating assembly is assembled using the method explained above, and the receptacle for the hand lever plate, in which the extension is supported, is closed at the edges.

[0022] In principle, the pawl (even if it is designed as a single piece with the steps and extension) can be manufactured in any way. For example, the pawl can be manufactured as a cast part, a milled part, or as an MIM part. In one proposal of the invention, the pawl is a bent sheet metal part. In this case, the sheet metal part forms, in particular, the steps and extensions, an engagement part, and an engagement part. The engagement part engages with a toothing of the positive locking mechanism. The engagement part, on the other hand, serves as an engagement surface for the spring. It is possible for the spring to engage with the engagement part, for example, in a closed-edged or open-edged recess in the engagement part. Alternatively, it is possible for the spring to only rest loosely against the pawl in the area of ​​the engagement part in order to load the pawl.

[0023] There are also many different options for the design of the spring. In one proposal of the invention, the spring is a T-shaped spring plate. In this case, the vertical leg T can form a leaf spring, while the two horizontal legs of the T form the extensions. The transitions from the vertical leg to the horizontal legs of the T then form the steps. In this case, the length of the vertical leg can, for example, be at least 5, at least 10 or at least 15 times greater than the length of the horizontal legs of the T. A spring designed in this way represents a particularly simple and cost-effective design of the spring, which at the same time enables easy assembly, reduces the variety of components and / or is robust against changes in the spring characteristics, even during continuous operation.

[0024] In another embodiment, the spring is a leg spring, spiral spring, or circular spring, preferably made of spring wire. In this case, the spring has two legs. One leg has an end bend oriented parallel to the bending axis of the leg spring and forms the extension, which (after insertion in the joining direction) is received in a receptacle of a hand lever plate. The other leg, on the other hand, acts on the pawl, which can be achieved by the other leg simply resting against the pawl or by the leg engaging the pawl.

[0025] When designing the spring as a torsion spring, spiral spring, or circular spring with two legs, it is possible for the other leg to also have a bend at the end. Preferably, the two bends of the two legs are oriented parallel to each other, but in opposite directions. The bend at the end of the other leg then forms an extension that engages with a receptacle of the locking pawl.

[0026] In a further embodiment of the pliers actuating assembly according to the invention, the pawl has two positions, namely a securing position and a release position. In the securing position, the pawl can slide ratchet-like along a toothing of the positive locking mechanism during a closing movement of the hand lever, while the pawl blocks an opening movement of the hand lever to ensure the function of the positive locking mechanism. In contrast, in the release position, the pawl slides ratchet-like along the toothing of the positive locking mechanism during an opening movement of the hand lever. In a known embodiment, for example according to DE 100 569 00 C1, the pawl is acted upon by a tension spring, the load of which is maximum in the securing position. When the hand lever reaches the closed position, the tension spring pulls the pawl into the release position, whereby the load on the spring is minimal.According to the invention, it is proposed, in a deviation, that the locking pawl is coupled to the spring in such a way that the spring loading is at a minimum in a position between the locking position and the release position. This means that the spring loading increases (by the same amount or to a different extent) from the position in which the loading is minimal towards the locking position and the release position. Compared to the prior art, a different force level of the spring can be specified in the locking position on the one hand and in the release position on the other, which can be advantageous for the function of the pliers actuation assembly.On the other hand, according to the prior art, the spring and its spring stiffness and strength must be selected such that the spring force can be varied from the minimum to the maximum for the entire pivoting angle between the securing position and the release position. In contrast, according to the invention, the change in the spring force between the minimum and the maximum, which increases up to the securing position or the release position, must be ensured only for a reduced angular range, on the one hand between the position with the minimum and the securing position and on the other hand between the position with the minimum and the release position. Preferably, the coupling of the spring to the pawl is effected in such a way that (starting from the position in which the spring force is minimal), the spring is loaded in the same direction both towards the securing position and towards the release position.

[0027] A further solution to the problem underlying the invention is provided by a pair of pliers that, on the one hand, has a pliers actuation assembly as previously explained. Furthermore, the pliers have a pliers head that can be coupled to the pliers actuation assembly in such a way that a stroke of the die halves of the pliers head can be brought about by manually actuating the actuation assembly. The coupling between the pliers actuation assembly and the pliers head can generally be implemented according to the embodiments explained above, in particular according to DE 100 569 00 C1, or in another manner described in the present application text.

[0028] Advantageous further developments of the invention emerge from the patent claims, the description and the drawings.

[0029] The advantages of features and combinations of several features mentioned in the description are merely exemplary and can be effective alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention.

[0030] With regard to the disclosure content – ​​not the scope of protection – of the original application documents and the patent, the following applies: Further features can be found in the drawings – in particular the illustrated geometries and the relative dimensions of several components to one another, as well as their relative arrangement and operative connection. The combination of features of different embodiments of the invention or features of different patent claims is also possible, deviating from the chosen references of the patent claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description. These features can also be combined with features of different patent claims.Likewise, features listed in the patent claims may be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent.

[0031] The number of features mentioned in the claims and the description is to be understood as meaning that exactly this number or a greater number than the stated number is present, without the need for the explicit use of the adverb "at least." Thus, for example, if reference is made to one element, this is to be understood as meaning that exactly one element, two elements, or more elements are present. The features mentioned in the claims may be supplemented by further features or may be the only features present in the subject matter of the respective claim.

[0032] The reference signs contained in the patent claims do not represent a limitation of the scope of the subject-matter protected by the patent claims. They serve solely to make the patent claims easier to understand. BRIEF DESCRIPTION OF THE CHARACTERS

[0033] In the following, the invention is further explained and described with reference to preferred embodiments shown in the figures. Fig. 1 shows an exploded view of a pliers actuation assembly. Fig. 2 shows in a spatial representation the pliers actuation assembly of a pliers according to Fig. 1 in assembled condition. Fig. 3 shows in an exploded view a pliers head of a pliers, which together with a pliers actuation assembly according to Fig. 1 and 2 can be used. Fig. 4 shows in a spatial representation the pliers head of a pair of pliers according to Fig. 3 in assembled condition. Fig. 5 to 8show in spatial representations the assembly and operation of a pair of pliers with a pliers actuation assembly according to Fig. 1 and 2 and a pliers head according to Fig. 3 and 4 . Fig. 9 shows a partially assembled state of a pliers according to Fig. 5 to 8 in a top view of the pliers head plane. Fig. 10 shows the pliers according to Fig. 5 to 9 in a sectional view with cutting parallel to the plane of the pliers head. Fig. 11 shows the pliers according to Fig. 5 to 10 in a closed position in a top view of the pliers head plane. Fig. 12 shows the pliers according to the Fig. 5 to 11 in the closed position in a sectional view with the cutting direction parallel to the plane of the pliers head. Fig. 13 shows a three-dimensional representation of a pull tab, as it can be used in a pliers actuation assembly according to Fig. 1 and 2 and a pair of pliers according to Fig. 5 to 12 . Fig. 14shows an exploded view of another embodiment of a pliers actuation assembly. Fig. 15 shows in a spatial representation the assembled pliers actuation assembly according to Fig. 14 . Fig. 16 shows an exploded view of a pliers head which, together with a pliers actuation assembly according to Fig. 14 and 15 can be used. Fig. 17 shows the pliers head according to Fig. 16 in assembled state in a spatial representation. Fig. 18 to 21 show a pliers having a pliers actuation assembly according to Fig. 14 and 15 and a pliers head according to Fig. 16 and 17 in different assembly and operating positions in a top view of the pliers head plane, partly in cut state with cutting parallel to the pliers head plane. Figs. 22 and 23show in spatial representations different design options of pull tabs of a pliers actuation assembly according to Fig. 14 and 15 and a pair of pliers according to Fig. 18 to 21 . Fig. 24 shows a pliers actuation assembly in a spatial exploded view. Fig. 25 shows in a spatial representation a stop part of a pliers actuation assembly according to Fig. 24 . Fig. 26 shows in a spatial representation a pivot pin of a pliers actuation assembly according to Fig. 24 . Fig. 27 to 37 show different assembly states for the assembly of a pliers actuation assembly according to Fig. 24 . Fig. 38 shows a spatial representation of a pawl of a positive locking mechanism, which consists of a metal sheet and forms integral extensions and shoulders. Fig. 39 shows a three-dimensional representation of a spring of a forced locking mechanism designed as a T-shaped leaf spring. Fig. 40 to 42show in a plan view a partially assembled or partially sectioned pliers actuation assembly with a positive locking mechanism with a pawl according to Fig. 38 and a spring according Fig. 39 , where Fig. 40 the spring and the pawl are in an intermediate position in which the load on the spring is minimal, while Fig. 41 the pawl and the spring in a locking position and Fig. 42 showing the pawl and the leaf spring in a release position. Fig. 43 shows a spatial representation of a pawl that integrally forms the projections and shoulders. Fig. 44 shows a spring designed as a leg spring with two legs. Fig. 45 to 47 show in a plan view a partially assembled or partially sectioned pliers actuation assembly with a positive locking mechanism with a pawl according to Fig. 43 and a spring according to Fig. 44 , where Fig. 45the pawl and the spring in an intermediate position, while Fig. 46 the pawl and the spring in a locking position and Fig. 47 showing the pawl and spring in a release position. Fig. 48 shows in a plan view a partially assembled or partially sectioned embodiment of a pliers actuation assembly with an alternative design and / or arrangement of a spring designed as a leg spring with two legs. Fig. 49 shows a pawl in a spatial representation. Fig. 50 shows a three-dimensional view of a spring designed as a circular spring made of a spring wire with two bends at the ends. Fig. 51 shows in a plan view a partially assembled or partially sectioned pliers actuation assembly with a positive locking mechanism with a pawl according to Fig. 49 and a spring according to Fig. 50 . FIGURE DESCRIPTION

[0034] In the following description, some components or features that correspond or are similar in terms of design, geometry and / or function are identified by the same reference symbols, whereby these can then be differentiated from one another by a supplementary letter a, b, ... In this case, reference can be made to the components or features with or without the supplementary letter, whereby without the supplementary letter, one component or feature, several components or features, or all components or features can be addressed.

[0035] Fig. 1 shows a pliers actuation assembly 1. The pliers actuation assembly 1 has hand levers 2, 3. The hand lever 2 is formed with two hand lever plates 4a, 4b. Accordingly, the hand lever 3 is formed with two hand lever plates 5a, 5b.

[0036] In the end region facing away from the handle part of the hand levers 2, 3, the hand levers 2, 3 each have a bearing eye 6, 7, which are designed here as bearing eyes 6a, 6b of the hand lever plates 4a, 4b and as bearing eyes 7a, 7b of the hand lever plates 5a, 5b.

[0037] The bearing eyes 6, 7 are bores through which a pivot pin 8 extends, forming a pivot bearing 9. The hand levers 2, 3 are pivotally connected to each other via the pivot bearing 9, allowing them to perform an opening and closing movement to effect a (crimping or pressing) stroke and an opening stroke.

[0038] The hand levers 2, 3 are preferably slightly offset from one another with offsets 10, 11. In the area of ​​the offsets 10, 11, the hand levers 2, 3 have receptacles 12, 13 designed here as bores. In these receptacles 12, 13, projections 14, 15 of pull tabs 16, 17 forming pivot pins are received, thus forming pivot bearings 18, 19, via which the pull tabs 16, 17 are articulated to the hand levers 2, 3. For the illustrated embodiment, the pull tabs 16, 17 each have extensions 14a, 14b and extensions 15a, 15b on both sides of a base body 20, 21, which are each received in receptacles 12a, 12b and receptacles 13a, 13b of the hand lever plates 4a, 4b and 5a, 5b, respectively.

[0039] The pull tabs 16, 17 are linear and designed like struts or rods. In the end regions facing away from the extensions 14, 15, the pull tabs 16, 17 each have a coupling element 22, 23. The coupling elements 22, 23 have coupling element parts 24a, 24b and 25a, 25b on both sides of their base bodies 20, 21, which are designed here as coupling pins 26a, 26b and 27a, 27b, respectively, and have extensions 28a, 28b, 29a, 29b in the end regions facing away from the base body 20, 21.

[0040] For the Fig. 1 In the embodiment shown, the pull tabs 16, 17 are formed in one piece, so that the base bodies 20, 21, the extensions 14, 15 and the coupling elements 22, 23 are an integral part of a single component.

[0041] Fig. 2shows the pliers actuation assembly 1 in its assembled state, with elastomeric handles 30, 31 additionally pushed onto the hand levers 2, 3. It can be seen here that the pull tabs 16, 17 with the coupling elements 22, 33 protrude freely upward from the pliers actuation assembly 1, with the pull tabs 16, 17 being freely pivotable due to the linkage via the pivot bearings 18, 19 on the hand levers 2, 3. Furthermore, the pivot pin 8 between the hand lever plates 4, 5 is freely accessible from above.

[0042] Fig. 3shows a three-dimensional exploded view of a pliers head 32. The pliers head 32 has a pliers head frame 33, which here is formed with frame plates 34a, 34b. A fixed die half 35 is arranged between the frame plates 34a, 34b. Connecting elements, in particular rivets 36a, 36b, connect the frame plates 34a, 34b and the fixed die half 35 arranged between them to form a solid structural unit. The two frame plates 34a, 34b are further connected via another rivet 36c.

[0043] The pliers head 32 further comprises a movable die half 37. The movable die half is guided on the pliers head frame 33 for displacement in the direction of a crimping or pressing axis 38. This can be achieved, for example, by the frame plates 34a, 34b having recesses 39a, 39b that form lateral guide surfaces on which guide surfaces of the movable die half 37 are guided. The rivet 36c can extend with the sleeve 94 through a recess 40 of the movable die half 37 and ensure additional guidance and / or limitation of the movement of the movable die half 37.

[0044] In the end region facing away from the fixed die half 35, the movable die half 37 has a pivot pin receptacle 41. In the illustrated embodiment, the pivot pin receptacle 41 is designed as a U-shaped recess 42 with an open-edged cross-section. The pivot pin receptacle 41, here the recess 42, is open downwards, i.e., in the state mounted on the pliers actuation assembly 1, in the direction of the pliers actuation assembly 1.

[0045] The pliers head 32 has a spring device 43, which here is formed with two springs 44a, 44b. The springs 44 are designed as compression springs. One spring base point of the springs 44 is supported on the pliers head frame 33 and / or the fixed die half 35, while the other spring base point of the springs 44 is supported on the movable die half 37. In the open position, in which the die half 37 is at its maximum distance from the die half 35, the load on the spring device 43 is minimal, while the load on the spring device 43 increases as the die half 34 approaches the die half 35 over the crimping or pressing stroke. For the illustrated embodiment, the springs 44 are arranged symmetrically on both sides next to the die surfaces of the die halves 35, 37, between which the workpiece is crimped or pressed.

[0046] The pliers head frame 33 has coupling recesses 45, 46. The frame plates 34a, 34b form coupling recess parts 47a, 47b of the coupling recess 45 and coupling recess parts 48a, 48b of the coupling recess 46.

[0047] For the illustrated embodiment, the coupling recesses 45, 46 and the coupling recess parts 47, 48 are designed as elongated holes 49 that are open on one side in the outer end region. The elongated holes 49 are inclined at an acute angle 50 relative to the crimping or pressing axis 38, wherein the angle 50 is preferably in the range of 20-80°, or 30 to 60°, or 35 to 55°. The acute angle 50 is oriented such that the apex points in the direction of the pliers actuating assembly 1, so that an entry movement from the outside into the elongated hole 49 has a component that is oriented in the direction of the pivot pin receptacle 41 and the pliers actuating assembly 1. The elongated hole 49 can have non-parallel lateral boundaries that have any curved shape when projected onto the pliers head plane.

[0048] Due to the distance between the frame plates 34, a gap 51 is created between the frame plates 34 (cf. Fig. 4 ), whereby this gap 51 is also present between the pairs of coupling recess parts 47a, 47b and coupling recess parts 48a, 48b. In the area of ​​the rivets 36a, 36b, the gap 51 between the frame plates 34 is defined by the die half 35. In contrast, the rivet 36c is surrounded by a sleeve 94, which defines the spacing of the frame plates 34 in the area of ​​the rivet 36c.

[0049] Fig. 5 shows the pliers actuation assembly 1 and the pliers head 32 before assembly.

[0050] According to Fig. 6For assembly, the pliers actuating part 1 is brought closer to the pliers head 32 from below so that the pivot pin 8 enters the pivot pin receptacle 41 from below. By the pivot pin 8 being in contact with the bottom of the pivot pin receptacle 41, an actuating force can be transmitted between the pliers actuating assembly 1 and the pliers head 32, which force tends to push the movable die half 37 upwards. In the partially assembled position according to Fig. 6 However, the pull tabs 16, 17 are still in a pivoting position in which they are located laterally from the pliers head frame 33 without coupling.

[0051] For further assembly, Fig. 7the pull tabs 16, 17 are pivoted inwards towards each other in the direction of the pliers head frame 33 until the coupling elements 22, 23 of the pull tabs 16, 17 enter the coupling recesses 45, 46 of the pliers head frame 33. In the present case, the coupling pins 26a, 26b enter the coupling recess parts 47a, 47b of the frame plates 34a, 34b and the coupling pins 27a, 27b of the pull tab 17 enter the coupling recess parts 48a, 48b of the pliers head frame 33. At the same time, the base bodies 20, 21 of the pull tabs 16, 17 enter the intermediate space 51 formed between the frame plates 34a, 34b.

[0052] The length of the pull tabs 16, 17 is dimensioned such that the described entry of the coupling elements 22, 23 into the coupling recesses 45, 46 can only occur when the movable die half 37 moves in the closing direction. This movement is greatest when the coupling elements 22, 23 are just entering the openings of the coupling recesses 45, 46, while a return movement of the movable die half 37 in the opening direction can occur when the coupling elements 22, 23 move into the interior of the coupling recesses 45, 46 up to the bottom thereof. The partial closing movement required for the entry of the coupling elements 22, 23 into the coupling recesses 45, 46 is smaller than the crimping or pressing stroke and is, for example, less than 20%, less than 15% or less than 10% of the crimping or pressing stroke.At the end of the entry movement, when the coupling elements 22, 23 rest against the bottom of the coupling recesses 45, 46, the movable die half 37 can return to the starting position, i.e., the maximum open position. Preferably, however, a partial closing path remains, which may, for example, be less than 10% or less than 5% of the crimping or pressing stroke. The explained partial closing movement and the described partial closing positions are accompanied by an application of the spring device 43. The spring force of the spring device 43 causes the coupling elements 22, 23 to be drawn into the coupling recesses 45, 46 and pressed against the bottom of the coupling recess 45, 46 with a spring force component. Disassembly with the removal of the coupling elements 22, 23 from the coupling recesses 45, 46 therefore requires overcoming this spring force component, which is generated by the spring device 43.

[0053] If a pliers 52 formed by assembling the pliers actuation assembly 1 and the pliers head 32 according to Fig. 7 used to crimp or press a workpiece, the operator closes the hand levers 2, 3, which causes the crimping or pressing stroke to run through. Fig. 8 shows the pliers 52 at the end of the crimping or pressing stroke, at which the hand levers 2, 3 and the die halves 35, 37 are closed.

[0054] In the Fig. 7 and 8 It can be seen that in a direction vertical to the pliers head plane in the assembled state the frame plates 34a, 34b are each caught between the base bodies 20, 21 and an extension 28, 29.

[0055] Fig. 9 shows the partially assembled state of the pliers 52 at the time the coupling elements 22, 23 enter the coupling recesses 45, 46, whereby some parts of the pliers 52 are omitted for better illustration.

[0056] In a corresponding partial assembly position, Fig. 10 the pliers 52 in a sectioned view in the plane of the dies 35, 37 and in the plane of the pliers head, in which the interaction of the pivot pin 8 with the pivot pin receptacle 41 and the contact pressure due to the springs 44a, 44b can be seen.

[0057] Finally, show Fig. 11 and 12 the Fig. 9 and 10 corresponding representations, but here the pliers 52 are shown in the closed position at the end of the crimping or pressing stroke.

[0058] As an optional special feature, when the coupling elements 22, 23 enter the coupling recesses 45, 46 or even previously when the pull tabs 16, 17 approach the pliers head frame 33, a contact surface 53 of the pull tabs 16, 17, 4 of the base body 20, 21 can come into contact with a contact surface 54 of the movable die half 37 (cf. Fig. 10). An actuating force applied to the pull tabs 16, 17, which pivots the pull tabs 16, 17 inward, is converted by the contact surfaces 53, 54 into an actuating force component, which provides an auxiliary assembly force that tends to move the movable die half 37 in the closing direction and compress the springs 44a, 44b. For this purpose, the contact surfaces 53, 54 are inclined at an acute angle 55 relative to the crimping or pressing axis 38. During the insertion movement, the contact surfaces 53, 54 slide along one another. The contact surfaces 53, 54 can also be curved as desired, resulting in an angle 55 that varies during the insertion movement.

[0059] Fig. 13is a three-dimensional individual part drawing of a pull tab 16, 17, which, as an integral, one-piece component, forms the base body 20, 21, the extensions 14a, 14b, 15a, 15b, and the coupling elements 22, 23. It can be seen here that the extensions 28, 29 are designed as plate bodies 56. It is possible that the extensions 28, 29 or plate bodies 56 form actuating elements 57, which simplify assembly and disassembly by allowing the user to apply the actuating forces required for assembly and disassembly and movement of the pull tabs 16, 17.

[0060] The coupling recesses 45, 46 can have any shape. They do not have to be designed as an elongated hole 49. Rather, it is crucial that the coupling recesses 45, 46 form upwardly oriented hooks or suspension eyes into which the coupling elements 22, 23 can be hooked.

[0061] The embodiment according to the Fig. 1 to 13 represents a possible embodiment of the above "first variant".

[0062] In the Fig. 14 to 21 A further embodiment of the pliers actuating assembly 1, the pliers head 32, and the pliers 52 formed with the pliers actuating assembly 1 and the pliers head 32 is shown, which represents a possible embodiment of the above "second variant." The same reference numerals are used for structurally or functionally corresponding or similar components and features as in Fig. 1 to 13 and reference is made to the relevant description.

[0063] The Fig. 14 and 15The pliers actuation assembly shown has pull tabs 16, 17 that do not have coupling elements 22, 23 in the form of coupling pins 26, 27. Rather, for this exemplary embodiment, the pull tabs 16, 17 are equipped with the coupling recesses 45, 46, which here are designed as a slot 49 open on one side. In this case, the coupling recesses 45, 46 are inclined at an acute angle 50, which is preferably in the range of 30° to 85° or 40° to 80° or 50° to 80°, relative to a radial direction to the pivot axis of the pivot bearings 18, 19 through the bottom of the coupling recess 45, 46. As can be seen, in this case the base body 20, 21 of the pull tabs 16, 17 has lateral extensions which form the actuating elements 57. Otherwise, the pliers actuating assembly 1 is designed according to the Fig. 1 and 2 shown and described in the pliers actuation assembly.

[0064] Fig. 16 and 17 1 and 2 show the pliers head 32 for this exemplary embodiment. Here, the pliers head frame 33 does not have any coupling recesses 45, 46. Rather, the pliers head frame 33 has coupling elements 22, 23 in the lower end region, which faces the pliers actuating assembly 1 in the assembled state, which are designed as coupling bolts 58, 59. The coupling bolts 58, 59 are preferably multifunctional in that they serve, on the one hand, as coupling elements for coupling to the pliers actuating assembly 1 and, on the other hand, for connecting the frame plates 34a, 34b. For the illustrated embodiment, the coupling bolts 58, 59 are stepped in the two end areas and are precisely fitted into corresponding receptacles 60a, 60b, 60c, 60d, which are designed here as bores, in the frame plates 34a, 34b.

[0065] Fig. 18 to 21show the pliers 52 formed with the pliers head 32 and the pliers actuation assembly 1 in different assembly states: According to Fig. 18 The pliers head 32 is removed from the pliers actuation assembly 1. The pivot pin receptacle 41 of the pliers head 32 is freely accessible on the side facing the pliers actuation assembly 1. The pivot pin 8 and the pull tabs 16, 17 of the pliers actuation assembly 1 are also freely accessible on the side facing the pliers head 32, whereby the pull tabs 16, 17 can be freely pivoted in the pliers head plane.

[0066] According to Fig. 19The pliers actuation assembly 2 has been brought closer to the pliers head 32 such that the pivot pin 8 enters the pivot pin receptacle 41 and comes to rest against the bottom of the pivot pin receptacle 41. Furthermore, the pull tabs 16, 17 are pivoted inward, whereby the coupling pins 58, 59 of the pliers head 32 enter the coupling recesses 45, 46 of the pull tabs 16, 17. The length of the pull tabs 16, 17 is dimensioned such that this entry is only possible when the movable die half 37 moves in the closing direction under the action of the spring device 43. With regard to the extent of the closing movement and the force ratios occurring during this, the statements made regarding the first embodiment apply accordingly.

[0067] If the coupling bolts 58, 59 are in the fully assembled position according to Fig. 20at the bottom of the coupling recesses 45, 46, the spring device 43 secures the thus mounted position. The pivoting of the hand levers 2, 3 towards each other then leads to the passing of the crimping or pressing stroke until the Fig. 21 The closed position shown is reached.

[0068] Fig. 22 shows the pull tabs 16, 17 as individual parts. The pull tabs 16, 17 are preferably formed integrally with the base body 20, 21 and the extensions 14, 15, as well as the actuating element 57. The pull tabs 16, 17 are preferably manufactured using a MIN manufacturing process.

[0069] Fig. 23shows an alternative design of the pull tabs 16, 17, in which the base body 20, 21 and a pivot pin 61, which forms the extensions 14, 15, are formed separately from one another. In this case, the base body 20, 21 can be manufactured, for example, as a milled or stamped part. The base body 20, 21 then has a bore 62 in which the pivot pin 61 is precisely received, for example, via a press fit.

[0070] For this embodiment, the pull tabs 16, 17 can also have a contact surface 53 which, when the pull tabs 16, 17 are pivoted in, comes into contact with a contact surface 54 of the movable die half 53. The contact surface can generate an actuating force component which causes a movement of the movable die half 37 in the closing direction in order to enable the coupling bolts 58, 59 to enter the coupling recesses 45, 46.

[0071] The coupling recesses 45, 46 and the coupling elements 22, 23 form coupling devices 63, via which the pliers head 32 can be mounted to and dismounted from the pliers actuation assembly 1 (in particular without the use of a tool).

[0072] Fig. 24 shows a pliers actuation assembly in a spatial exploded view, wherein the pliers actuation assembly 1 basically corresponds to the Fig. 14 to 23 described embodiment. However, the following also applies accordingly to a design corresponding to the embodiment in Fig. 1 to 13 .

[0073] In the nomenclature of the patent claims on the one hand and the preceding description of the figures on the other hand, the hand lever plate 4b of the hand lever 2 forms a first hand lever plate 64, the hand lever plate 4a of the hand lever 2 forms a second hand lever plate 65, the hand lever plate 5b of the hand lever 3 forms a third hand lever plate 66 and the hand lever plate 5a of the hand lever 3 forms a fourth hand lever plate 67.

[0074] The first hand lever plate 64 has a recess 68 in the form of an elongated hole 69. One end region of the elongated hole 69 forms a stop 70. The elongated hole 69 has a circularly curved longitudinal axis that runs concentrically to the pivot axis of the two hand levers 2, 3 defined by the pivot pin 8.

[0075] The third hand lever plate 66 has a holding and / or guide recess, which is designed here as a holding and / or guide bore 71. The distance of the holding and / or guide bore 71 from the pivot axis defined by the pivot pin 8 corresponds to the distance of the elongated hole 69 from the pivot axis defined by the pivot pin 8.

[0076] Fig. 25shows a stop part 72. The stop part 72 has or consists of a first cylindrical longitudinal section 73 with a first diameter and a second cylindrical longitudinal section 74 with a second diameter that is larger than the first diameter. The longitudinal sections 73, 74 are arranged coaxially to one another. The transition from the first longitudinal section 73 to the second longitudinal section 74 takes place via a shoulder 75, which here is formed by an annular surface 76. During assembly, the first longitudinal section 73 is inserted from the inside, i.e. from the side of the second and fourth hand lever plates 65, 67, into the holding and / or guide bore 71, which in particular provides radial guidance for the stop part 71 and specifies the position of the stop part 72 in the pivot plane of the hand levers 2, 3, as well as specifies the orientation of the stop part 72 vertically to this pivot plane.The stop part 72 is inserted into the holding and / or guide bore 71 far enough that the shoulder 72 on the inner side of the third hand lever plate 66, i.e., on the side facing the hand lever plates 65, 67, comes into contact with the third hand lever plate 66, whereby the free end region of the first longitudinal section 73 protrudes from the third hand lever plate 66 and is arranged in the elongated hole 69. Preferably, the end face of the first longitudinal section 73 is arranged flush with the outer surface of the first hand lever plate 64.

[0077] The free end face of the second longitudinal section 74 forms a (here circular) support surface 77. In the assembled state of the pliers actuation assembly 1, the support surface 77 rests against the second hand lever plate 65. In the insertion direction of the stop part 72 into the third hand lever plate 66, the stop part 72 is secured in the assembled state by the shoulder 75 bearing on the third hand lever plate 66, while securing in the opposite direction is achieved by the support surface 77 bearing on the second hand lever plate 65, so that the stop part 72 is caught between the second hand lever plate 65 and the third hand lever plate 66.

[0078] Fig. 26shows a spatial representation of the pivot pin 8. It can be seen here that the pivot pin 8 has a first cylindrical longitudinal section 78 and a second cylindrical longitudinal section 79, which are separated from one another by a shoulder 80, which is designed as a circular ring surface 81.

[0079] During assembly of the pliers actuation assembly 1, the pivot pin 8 is inserted with the first longitudinal section 78 into the bearing eye 6b until the circular ring surface 81 on the inside comes into contact with the first hand lever plate 64. Subsequently, the second, third and fourth hand lever plates 65, 66, 67 are pushed onto the pivot pin 8 with the bearing eyes 7b, 6a, 7a.

[0080] For the illustrated embodiment, the pliers actuation assembly 1 has a positive locking mechanism 82. Such a positive locking mechanism 82 serves to ensure that a partially closed position of the hand levers 2, 3, once reached, is secured in several partial stages during the pressing or crimping stroke, so that even if the manual forces applied to the hand levers 2, 3 are reduced, no opening movement of the hand levers 2, 3 is possible. Rather, the positive locking mechanism 82 enables an opening movement of the hand levers 2, 3 only when the pressing or crimping stroke has been completed or reached a defined closed position.

[0081] The positive locking mechanism 82 has a toothing 83, which here is formed by an extension 84 of the second hand lever plate 65. Furthermore, the positive locking mechanism 82 has a pawl 85. The pawl 85 is pivotally mounted and acted upon by a spring 86. The pawl 85 interacts with the toothing 83 such that, during the closing movement of the hand levers 2, 3, upon reaching a partially closed position to be secured, the pawl 85 passes a tooth of the toothing 83 in a ratchet-like manner, while the pawl 85 blocks an opening movement by suitable support on the tooth it has passed. Once the locking pawl 85 has passed all the teeth of the toothing 83 after completing the closing stroke, the locking pawl 85 can fold over, whereby the locking pawl 85 can then pass the toothing 83 of the hand levers 2, 3 in a ratchet-like manner during an opening movement that is then made possible.

[0082] The following describes the assembly of the pliers actuation assembly 1, whereby the corresponding procedure for the Fig. 1-23 The following applies to the embodiments shown: The assembly begins with the provision of the first hand lever plate 64 (cf. Fig. 27 ).

[0083] The first longitudinal section 78 of the pivot pin 8 is then inserted into the bearing eye 6b of the first hand lever plate 64 from the inside of the first hand lever plate 64 until the shoulder 80 of the pivot pin 8 comes to rest on the hand lever plate 64 (cf. Fig. 28 ).

[0084] Subsequently, the third hand lever plate 66 is pushed onto the pivot pin 8 from the inside, whereby the pivot pin 8 enters the bearing eye 7b. Fig. 29 shows the end position of the third hand lever plate 66, in which the first and third hand lever plates 64, 66 slide against each other under the guidance of the pivot pin 8.

[0085] In the next assembly step, the first longitudinal section 73 of the stop part 72 is inserted from the inside into the holding and / or guide bore 71 and guided through it until the free end region of the first longitudinal section 73 is received in the elongated hole 69 (cf. Fig. 30 ).

[0086] According to Fig. 31Spacers 87a, 87b, 87c, 87d are then inserted into receptacles 88a, 88b, 88c, 88d. For the illustrated embodiment, the spacers 87 each have a central cylindrical longitudinal section, the longitudinal extent of which determines the distance between the second hand lever plate 65 and the third hand lever plate 66, and cylindrical end-side longitudinal sections that form pins that are received in the receptacles 88, which are designed as bores, in the hand lever plates 64, 66 (and later also in the hand lever plates 65, 67). The pins have a smaller diameter than the central longitudinal section, so that the transition from the central longitudinal section to the pins takes place via a shoulder, here in the form of a circular ring.These shoulders are then captured between the second and third hand lever plates 65, 66, thus securing the spacers 87 between the hand lever plates 65, 66 against disassembly in a direction vertical to the pivoting plane of the hand levers 2, 3. The spacers 87 then define the gap between the pairs of the relatively pivotable hand lever plates 64, 66 and 65, 67.

[0087] According to Fig. 32 The extensions 14b, 15b of the pull tabs 16, 17 are then inserted into the receptacles 12b, 13b.

[0088] In the next assembly step, the second hand lever plate 65 is joined. During this joining, the bearing eye 6a of the second hand lever plate 65 is pushed onto the pivot pin 8. At the same time, the extension 14a enters the receptacle 12a of the second hand lever plate 65 and the pins of the spacers 87a, 87b enter the receptacles 88c, 88d of the second hand lever plate 65. The assembly state then achieved is shown in Fig. 33 shown.

[0089] In the next assembly step, the locking pawl 85 is mounted with the third hand lever plate 66 by an extension 89 of the locking pawl 85 being received in a receptacle 90 of the third hand lever plate 66 (cf. Fig. 34 ).

[0090] This is followed by assembly of the spring 86. For the illustrated embodiment, the spring 86 is T-shaped, with the vertical leg of the T forming a leaf spring 91 and the two horizontal legs of the T each forming an extension 92. An extension 92 is received in a receptacle 93 of the third hand lever plate 66. Furthermore, the spring 86 is supported adjacent to the extension 92 on a spacer 87 in the bending direction of the leaf spring 91. The leaf spring 91 projects freely and is supported in the end region facing away from the extension 92 on the pawl 85 under pressure therefrom (cf. Fig. 35 ).

[0091] Subsequently, the fourth hand lever plate 67 is placed onto the pivot pin 8. With this placement, pins of the spacers 87c, 87d enter into receptacles 88a, 88b of the fourth hand lever plate 67, a further extension 89 of the pawl 85 enters a receptacle 90 of the fourth hand lever plate 67 and an extension 15a enters a receptacle 13a of the fourth hand lever plate 67 (cf. Fig. 36 ).

[0092] In the assembly state thus achieved (or even partially beforehand), the hand lever plates 64, 65, 66, 67 are then fixed. This is done, for example, by pressing the spacers 87 into the receptacles of the hand lever plates 64, 65, 66, 67. In addition, the pivot pin 8 can also be pressed, but this must be done while maintaining the pivoting degree of freedom of the hand levers 2, 3.

[0093] Finally, the handles 30, 31 are pushed onto the hand lever plates 64, 65, 66, 67 ( Fig. 37 ).

[0094] Fig. 38 shows a three-dimensional representation of a locking pawl 85. The locking pawl 85 is made of a bent metal sheet. The locking pawl 85 is formed in one piece with a base body 95, an engagement part 96, aligned extensions 97a, 97b, which merge into the base body 95 via shoulders 98a, 98b, and an angled release part 99.

[0095] Fig. 39 shows in a spatial individual part view the spring 86, which is T-shaped with two aligned extensions 92a, 92b and a leaf spring 91.

[0096] Fig. 40 shows a pliers actuation assembly 1 in a partially sectioned or partially assembled state. The extensions 92a, 92b are received in the receptacles 93 of the third and fourth hand lever plates 66, 67, whereby a spring base point of the leaf spring 91 is pivotally fixed to the hand lever plates 66, 67. Adjacent to this spring base point, the leaf spring 91 is supported on the cylindrical surface of a spacer 87.

[0097] The extensions 97a, 97b of the locking pawl 85 are received in the receptacles 90 of the hand lever plates 66, 67, thus forming a pivot bearing. On one side of the base body 95 of the locking pawl 85, the end region of the leaf spring 91, which projects freely beyond the spacer 87, is supported by the leaf spring 91 loosely resting against the base body 95. The contact surface between the locking pawl 85 and the leaf spring 91 forms an engagement part 100 of the locking pawl 85, via which the spring 86 acts on the locking pawl 85.

[0098] Fig. 40 shows the pawl 85 and the spring 86 in an intermediate position, in which the load on the spring 86 is minimal. The intermediate position corresponds to the closed position of the hand levers 2, 3, in which the pawl 85 has completely passed the toothing 83 of the hand lever plate 65.

[0099] Fig. 41 shows the pliers actuation group 1 at the beginning of the closing stroke of the hand levers 2, 3, with the spring 86 and the pawl 85 in a locking position. In the locking position, during a closing movement of the hand levers 2, 3, the pawl 85 with the engagement part 96 can move ratchet-like along the toothing 83. The engagement of the engagement part 96 in the toothing 83 blocks an opening movement of the hand levers 2, 3 when a partial closing position predetermined by the toothing 83 is reached. Compared to the intermediate position in Fig. 40 the deflection of the leaf spring 91 is increased. At the end of the closing movement of the hand lever starting from Fig. 41 the intermediate position is determined according to Fig. 40 reached.

[0100] If, starting from the intermediate position, Fig. 40 , the opening movement of the hand levers 2, 3, the locking pawl 85 is folded by a folding bevel 101, which is arranged in the end region of the toothing 83, in a direction which is opposite to the folding from the intermediate position into the securing position according to Fig. 41 In the release position thus achieved according to Fig. 42 With the opening movement of the hand levers 2, 3, the engagement part 96 can be moved ratchet-like along the toothing 83.

[0101] Starting from the intermediate position according to Fig. 40 the deflection for the movement towards the securing position is carried out according to Fig. 41 and towards the release position according to Fig. 42 of the leaf spring 91 in the same direction. The loading of the leaf spring 91 is minimal for the intermediate position according to Fig. 40 and rises in the direction of the safety position according to Fig. 41 and in the direction of the release position according to Fig. 42 whereby the loading in the safety position is in accordance with Fig. 41 and the release according to Fig. 42 can be the same or can be different. This can be seen in the Fig. 41 , 42 that the leaf spring 91 in the securing position and the release position rests eccentrically to the pivot axis of the pawl 85 at different locations or areas on the pawl 85, wherein in the securing position on the one hand and in the release position on the other hand the contact surface and thus the engagement part 100 are arranged on different sides of the pivot axis.

[0102] If an emergency release of the positive locking mechanism 82 is required, the user can do so by manually changing a position of the locking pawl 85 by directly acting on the angled release part 99 with a finger.

[0103] For the Fig. 43 In the illustrated embodiment, the locking pawl 85, which here is also designed as a one-piece bent metal sheet, has the engagement part 100 in the region of a bend, which in this case is designed as an open-edged, for example U-shaped, laterally open recess 102. As will be explained below, an end region of the spring 86 can be arranged in the recess 102. Preferably, the sheet metal in the region of the recess 102 is formed with a phase, bevel, or a type of cutting edge in the region of the two lateral boundaries of the recess 102, thus enabling different angles between the spring 86 and the locking pawl 85 and forming a type of pivot bearing connection (with a limited pivot angle).

[0104] According to Fig. 44 The spring 86 is designed as a leg spring 103. The leg spring 103 is made of spring wire. The leg spring 103 has a winding 104 with a constant diameter and any winding angle, wherein in the illustrated embodiment, the winding 104 is wound over a winding angle of, for example, 720°. Two legs 105a, 105b extend in opposite directions from the winding 104, wherein the legs 105a, 105b can be oriented coaxially or parallel to one another or can form any angle when the spring 86 is in the relaxed state. The end region of the leg 105b facing away from the winding 104 is equipped with an angled portion 106, which forms an extension 107. The bend 106 and the extension 107 are oriented vertically to the bending plane and movement plane of the legs 105a, 105b and to the pivoting plane of the hand levers 2, 3.

[0105] Fig. 45 shows a partially assembled or partially cut pliers actuation assembly 1 with a positive locking mechanism 82 with the pawl 85 according to Fig. 43 and the spring 86 according to Fig. 44 . It can be seen that the winding 104 extends around a spacer 87, whereby the leg spring 103 is rotatably mounted on the hand lever plates 66, 67 in the region of the winding 104. However, it is also possible that the spacer 87 is elastically clamped by the winding 104. The extension 107 formed by the angled portion 106 is received in a receptacle 108 formed by the hand lever plate 66, which receptacle is designed as a bore here. The free end region of the other leg 105a is received in the recess 102 of the pawl 85. In the intermediate position according to Fig. 45 , in which the pawl 85 has completely passed the toothing 83 and the closed position of the hand levers 2, 3 has been reached, the leg spring 103 is not preloaded.

[0106] Fig. 46 shows the locking pawl 85 in the locking position. It can be seen here that the cutting edge of the recess 102 of the locking pawl 85 allows the relative angle between the leg 105a and the locking pawl 85 to be changed.

[0107] On the other hand, Fig. 47 the positive locking mechanism 82 in the release position. Here too, the leg 105a of the leg spring 103 is (just) arranged in the receptacle 102 of the pawl 85. In contrast to the previously explained embodiment according to Fig. 40 bis 42 Here, the locking pawl 85 is subjected to different loading directions for the locking position on the one hand and the release position on the other, so that the leg spring 103, relative to its bending axis, is subjected to bending moments in the locking position on the one hand and the release position on the other, which have a different direction. However, it is also possible that the leg spring 103 has a minimal loading in the release position [or the locking position], which then increases towards the locking position [or the release position].

[0108] According to Fig. 47 the leg spring 103 is joined to the spacer 87 in such a way that the legs 105a, 105b leave the winding 104 on the outside of the hand lever 3.

[0109] Fig. 48 shows that alternatively, a different design and / or assembly of the leg spring 103 is possible, in which the legs 105a, 105b leave the winding 104 on the inside of the hand lever 3.

[0110] For the Fig. 49 In the illustrated embodiment, the engagement part 100 of the locking pawl 85 is bent into a U-shape, so that an end region of the engagement part 100 extends parallel to the base body 95. For this embodiment, the locking pawl 85 has a lateral bore or receptacle 109 that extends parallel to the plane of extension of the metal sheet in this end region.

[0111] Fig. 50 shows a configuration of the spring 86 as a circular spring 110 made of spring wire. For the illustrated embodiment, a winding angle of a winding 111 of the circular spring 110 is, for example, 540°. The end regions of the circular spring 110 transition via bends 106a, 106b into extensions 107a, 107b, with the extensions 107a, 107b being oriented parallel to one another with opposite directions.

[0112] Fig. 51 shows the partially assembled or partially cut pliers actuation assembly 1 with the locking pawl 85 according to Fig. 49 and the spring 86 according to Fig. 50 . It can be seen here that the circular spring 110 extends with its main extension plane parallel to the pivot plane of the hand levers 2, 3. One extension 107 is received in the receptacle 109 of the pawl 85, while the other extension 107 is received in a receptacle 112 of the hand lever plate 66, 67. BEZUGSZEICHENLISTE

[0113] 1Plier actuation assembly 2Hand lever 3Hand lever 4Hand lever plate 5Hand lever plate 6Bearing eye 7Bearing eye 8Pivot pin 9Pivot bearing 10Crank 11Crank 12Receptacle 13Receptacle 14Extension 15Extension 16Pull tab 17Pull tab 18Pivot bearing 19Pivot bearing 20Base body 21Base body 22Coupling element 23Coupling element 24Coupling element part 25Coupling element part 26Coupling pin 27Coupling pin 28Extension 29Extension 30Handle 31Handle 32Plier head 33Plier head frame 34Frame plate 35Fixed die half 36Rivet 37Movable die half 38Crimp or press axis 39Recess 40Recess 41Pivot pin receptacle 42Recess 43Spring device 44Spring 45Coupling recess 46Coupling recess 47Coupling recess part 48Coupling recess part 49Elongated hole 50Acute angle 51Gap 52Plier 53Contact surface 54Contact surface 55Acute angle 56Plate body 57Actuating element 58Coupling pin 59Coupling pin 60Receptacle 61Pivot pin 62Bore 63Coupling device64First hand lever plate 65Second hand lever plate 66Third hand lever plate 67Fourth hand lever plate 68Recess 69Elongated hole 70Stop 71Holding and / or guide hole 72Stop part 73First longitudinal section 74Second longitudinal section 75Step 76Annular surface 77Support surface 78First longitudinal section 79Second longitudinal section 80Step 81Annular surface 82Safety lock 83Toothing 84Extension 85Pawl 86Spring 87Spacer 88Receptacle 89Extension 90Receptacle 91Leaf spring 92Extension 93Receptacle 94Sleeve 95Base body 96Engaging part 97Extension 98Step 99Release part 100Engaging part 101Folding bevel 102Recess 103Torch spring 104Winding 105Leg 106Angled section 107Extension 108Receptacle 109Receptacle 110Circular spring 111Winding 112Receptacle

Claims

1. Method of assembling a pliers actuation assembly (1) which is couplable to a pliers head (32) for providing pliers (52) in a way such that by means of a manual actuation of the pliers actuation assembly (1) a stroke of die halves (35, 37) of the pliers head (32) can be induced, with - two hand levers (2, 3), wherein one hand lever (2) comprises two hand lever plates (64, 65, 66, 67) which are rigidly connected to each other, - a pivot bolt (8) by which the hand levers (2, 3) are connected to one another for being pivoted, - wherein a locking pawl (85) of a forced locking mechanism and / or a spring (86) of a forced locking mechanism which biases a locking pawl (85) of the forced locking mechanism and / or a pulling bar (16, 17) comprise / comprises shoulders (98) and protrusions (14; 15, 92, 97, 107) arranged in front of the shoulders (98), characterised by the following method steps: a) joining the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) in a joining direction into one hand lever plate (64; 65; 66; 67), whereby a protrusion (14, 15; 92; 97; 107) of the locking pawl (85) and / or of the spring (86) and / or of the pulling bar (16, 17) enter / enters into an accommodation (12, 13; 90; 93; 108; 109; 112) of the hand lever plate (64, 65, 66, 67) and a shoulder (98) of the locking pawl (85) and / or of the spring (86) and / or of the pulling bar (16, 17) establish / establishes a contact with the hand lever plate (64, 65, 66, 67) in joining direction or is arranged adjacent thereto, and b) joining the other hand lever plate (64, 65, 66, 67) in the joining direction onto the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17), whereby the other protrusion (14, 15; 92; 97; 107) of the locking pawl (85) and / or of the spring (86) and / or of the pulling bar (16, 17) enter / enters into an accommodation (12, 13; 90; 93; 108; 109; 112) of the other hand lever plate (64, 65, 66, 67) and a shoulder (98) of the locking pawl (85) and / or of the spring (86) and / or of the pulling bar (16, 17) establish / establishes a contact with the other hand lever plate (64, 65, 66, 67) or is arranged adjacent thereto and c) fixing the relative position of the hand lever plates (64, 65, 66, 67), d) the shoulders (98) of the locking pawl (85) and / or of the spring (86) and / or of the pulling bar (16, 17) being trapped between the hand lever plates (64, 65, 66, 67) and the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) being secured against a disassembly from the hand lever plates (64, 65, 66, 67) fixed relative to one another, wherein the spring (86) and / or the locking pawl (85) and / or the pulling bar (16, 17) integrally form the protrusions (14, 15; 92; 97; 107) and the shoulders (98).

2. Method of claim 1, characterized in that the assembly is performed at least partially automatically.

3. Pliers actuation assembly (1), which can be coupled to a pliers head (32) for providing pliers (52) in a way such that by means of a manual actuation of the pliers actuation assembly (1) it is possible to induce a stroke of die halves (35, 37) of the pliers head (32), the pliers actuation assembly (1) comprising - two hand levers (2, 3), wherein one hand lever (2) comprises two hand lever plates (64, 65, 66, 67) which are rigidly connected to each other, - a pivot boult (8), by which the hand levers (2, 3) are connected to each other for being pivoted, - a force locking mechanism (82), which secures a partially closed position of the hand levers (2, 3) against an opening movement and only allows an opening movement when a closed position of the hand levers (2, 3) is reached, wherein the forced locking mechanism (82) comprises a locking pawl (85) supported for being pivoted on a hand lever (2) and a spring (86) which is supported with one spring base on the hand lever (2) and biases the locking pawl (85), - wherein the locking pawl (85) and / or the spring (86) and / or at least one pulling bar (16, 17) comprise / comprises a shoulder (98) and a protrusion (14, 15; 92; 97; 107) arranged in front of the shoulder (98) and the protrusion (14, 15; 92; 97; 107) is supported in an accommodation (12, 13; 90; 93; 108; 112) of one hand lever plate (64, 65, 66, 67) and the shoulder (98) is supported on the hand lever plate (64, 65, 66, 67), wherein - the pliers actuation assembly (1) is assembled by use of a method of one of claims 1 and 2, - the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) are formed integrally with the shoulder (98) and the protrusion (14, 15; 92; 97; 107) and - the cross section of the accommodation (12, 13; 90; 93; 108; 112) of the hand lever plate (64, 65, 66, 67), in which the protrusion (14, 15; 92; 97; 107) is supported, has a closed edge.

4. Pliers actuation assembly (1) of claim 3, characterized in that a) the locking pawl (85) and / or the spring (86) and / or a pulling bar (16, 17) comprise / comprises shoulders (98) and protrusions (14, 15; 92; 97; 107) arranged in front of the shoulders (98), b) the protrusions (14, 15; 92; 97; 107) are supported in accommodations (12, 13; 90; 93; 108; 112) of the hand lever plates (64, 65, 66, 67), c) the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) are formed integrally with the shoulders (98) and the protrusions (14, 15; 92; 97; 107) and d) the shoulders (98) of the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) is / are trapped between the hand lever plates (64, 65, 66, 67) so that the locking pawl (85) and / or the spring (86) and / or the pulling bar (16, 17) are / is secured against a disassembly from the hand lever plates (64, 65, 66, 67) which are fixed relative to each other.

5. Pliers actuation assembly (1) of claim 3 or 4, characterized in that the locking pawl (85) is a bent metal sheet, wherein the metal sheet in particular forms the shoulders (98) and protrusions (97), an engaging part (96) for a toothing (83) of the forced locking mechanism (82) and an attacking or contacting part (100) for the spring (86).

6. Pliers actuation assembly (1) of claim 4 or of claim 5 when referring back to claim 4, characterized in that the spring (86) is a T-shaped metal spring sheet, wherein a vertical leg of the T forms a leaf spring (91) and the horizontal legs of the T form the protrusions (92) and the transitions of the vertical leg to the horizontal legs of the T form the shoulders (98).

7. Pliers actuation assembly (1) of claim 3, characterized in that the spring is a leg spring, spiral spring or circular spring (103; 110) which comprises two legs (105a, 105b) or end sections, wherein a) one leg (105b) or end section comprises an end sided angled section (106) which has an orientation parallel to a bending axis of the leg spring, spiral spring or circular spring (103; 110) and forms the protrusion (107) which is accommodated in an accommodation (108; 109; 112) of a hand lever plate (66, 67) and b) the other leg (105a) or end section biases the locking pawl (85).

8. Pliers actuation assembly (1) of claim 7, characterized in that the other leg (105a) or end section comprises an end sided angled section (106) which has an orientation parallel to the bending axis of the leg spring, spiral spring or circular spring (103; 110) and forms a protrusion (107) which engages into an accommodation (108; 109; 112) of the locking pawl (85).

9. Pliers actuation assembly (1) of one of claims 3 to 8, characterized in that the locking pawl (85) a) comprises a securing position in which the locking pawl (85) is able to slide in a ratchetlike manner along a toothing (83) of the forced locking mechanism (82) during a closing movement of the hand levers (2, 3) but blocks an opening movement of the hand levers (2, 3), b) comprises a released position in which the locking paws (85) is able to slide in a ratchetlike manner along the toothing (83) of the forced locking mechanism (82) during an open movement of the hand levers (2, 3), the spring (86) being coupled to the locking pawl (85) in a way such that the bias of the spring (86) has a minimum in a position between the securing position and the release position.

10. Pliers (52) comprising a pliers actuation assembly (1) of one of claims 3 to 9 and a pliers head (32), the pliers actuation assembly (1) being coupled to the pliers head in a way such that by means of an manual actuation of the pliers actuation assembly (1) a stroke of die halves (35, 37) of the pliers head (32) can be induced.