pliers actuation assembly, pliers and assembly method

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. STATE OF THE ART

[0003] DE 100 569 00 C1 discloses a crimping pliers assembly comprising a crimping pliers actuating assembly according to the preamble of claim 1 and a crimping pliers head. The crimping pliers actuating assembly has two hand levers pivotally connected to one another via a pivot pin. A pull tab is hinged to each of the hand levers 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, a 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 pivotally connects the two hand levers, a cross pin is mounted on one hand lever. This cross pin extends into a slotted hole in the other hand lever. This slot is curved so that the slot 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 slotted hole. OBJECT OF THE INVENTION

[0004] The present invention is based on the object of proposing a pair of pliers and a pliers actuation assembly which, with regard to the manufacture and / or assembly and / or disassembly is improved.

[0005] Furthermore, the invention is based on the object of proposing a simplified and / or automated method for assembling a pair of pliers or a pliers actuation assembly. SOLUTION

[0006] 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

[0007] One solution to the underlying problem is a pliers actuating assembly. This pliers actuating assembly can be coupled with a pliers head to form a (pressing or crimping) pair of pliers. The coupling can be factory-assembled for the same type of pliers actuating assembly and pliers head, with the pliers subsequently being distributed. It is also possible for pliers actuating assemblies of one type to be factory-assembled with different types of pliers heads, allowing pliers of different types to be manufactured and distributed, thus increasing the number of identical parts despite the distribution of different types of pliers.It is also possible to provide a customer with a pliers set in which a pliers actuation assembly with different types of pliers heads is provided for machining different workpieces and the customer can couple a selected pliers head from the several types of pliers heads with a pliers actuation assembly as required.

[0008] In the pliers actuating assembly according to the invention, this coupling is effected in such a way that, upon manual actuation of the pliers actuating assembly, a (pressing or crimping) stroke of the die halves of the pliers head can be brought about by applying manual forces to the hand lever of the pliers actuating assembly.

[0009] The pliers actuating assembly according to the invention has two hand levers. One hand lever has a first hand lever plate and a second hand lever plate, which can be manufactured, for example, by stamping. The first and second hand lever plates are rigidly connected to one another. The other hand lever has a third hand lever plate and a fourth hand lever plate. The third and fourth hand lever plates are also rigidly connected to one another. The hand lever plates are arranged in planes oriented parallel to one another, wherein, for example, it is possible for a pair of hand lever plates to bear directly against one another and to execute a relative sliding pivoting movement, while a gap can be formed between the two such pairs of hand lever plates.

[0010] The two hand levers formed in this way are pivotably connected to each other via a pivot pin. If the pliers actuation assembly is intended to form a crimping tool, the pivot pin can simultaneously serve as a pressure or actuation pin, interacting with a U-shaped pivot pin receptacle of the crimping tool head (cf. the aforementioned prior art DE 100 569 00 C1).

[0011] In the pliers actuation assembly according to the invention, the first hand lever plate forms a stop, while a stop part is held and / or guided on the third hand lever plate. The opening angle of the hand levers is limited in that, upon reaching the opening angle, the stop of the first hand lever plate comes into contact with the stop part held and / or guided on the third hand lever plate. It is possible for two hand lever plates to have a stop, while a stop part is held and / or guided on the other hand lever plates. However, this preferably occurs only on one pair of hand lever plates.

[0012] The inventive proposal is based in particular on the finding that during conventional assembly of a pliers actuation assembly, the components thereof are brought into an assembly position in which their holding, guide, and / or connecting bores are aligned with one another so that a coupling screw, a coupling pin, a coupling rivet, the pivot bolt, or the cross bolt can be inserted into them. A coupling screw must then protrude from the components coupled in this way in order to be secured by means of a nut, or be screwed directly to a component. A coupling pin, the pivot bolt, or the cross bolt must be secured in particular by a press fit in at least one component, which requires increased joining force. A rivet must be expanded in order to be secured in at least one component.These coupling technologies are complex and may not be suitable for partially or fully automated assembly.

[0013] The inventive solution proposes a new possibility for the assembly and securing of the stop part and / or the pivot pin: According to the invention, the stop part (and / or the pivot pin) has a shoulder. In the assembled state of the pliers actuation assembly, the shoulder rests against the third hand lever plate. The stop part (or the pivot pin) is supported by this contact with the shoulder on the third hand lever plate outwards, i.e., with respect to a movement out of the pliers actuation assembly vertically relative to the pivot plane of the hand levers. The invention thus results in an alternative support in this direction that is not based on securing by a screw connection, a frictional locking in a receiving bore, or a rivet.The illustrated arrangement of the shoulder on the third hand lever plate and the resulting outward support can be the only securing of the stop part or pivot pin in this direction with regard to unintentional disassembly or further cumulative securing measures can be taken, whereby the screw connection, press connection or rivet connection explained above can also be used in addition.

[0014] There are different possibilities for the arrangement of the first hand lever plate and the third hand lever plate within the scope of the invention, some of which are mentioned below only as examples, without the invention being restricted to these examples: In a first possibility, the first hand lever plate is located on the outside. In this case, the hand lever plates can be arranged in a direction vertical to the pivot plane of the hand levers in the order first hand lever plate - third hand lever plate - (if necessary in the intermediate space) - second hand lever plate - fourth hand lever plate. Alternatively, it is possible for the hand lever plates to be arranged in this direction in the order first hand lever plate - third hand lever plate - (if necessary in the intermediate space) - fourth hand lever plate, second hand lever plate.

[0015] One aspect of the invention relates to the design of the stop part for this possibility. In this proposal, the stop part has a first longitudinal section and a second longitudinal section which are connected to one another via the shoulder. Preferably, the two longitudinal sections merge into one another directly via the shoulder. It is possible for the first longitudinal section to be cylindrical and have a smaller diameter than the second longitudinal section, wherein, if the longitudinal axes of the longitudinal sections are aligned, the shoulder is then circular. The first longitudinal section extends through the third hand lever plate, thus ensuring that the stop part is held and / or guided in the third hand lever plate. In an end region protruding from the third hand lever plate, the first longitudinal section interacts with the stop of the first hand lever plate.While the second longitudinal section is then supported in a first direction vertical to the pivot plane of the hand levers via the shoulder on the third hand lever plate, the second longitudinal section has a support surface in the end region facing away from the first longitudinal section, which comes into contact with the third or fourth hand lever plate (depending on the sequence of the hand lever plates) in the opposite direction. In this way, the stop part is trapped in both directions vertical to a pivot plane of the hand levers between the third hand lever plate and the second or fourth hand lever plate.

[0016] For the other possibility encompassed by the invention, the third hand lever plate is located on the outside. In this case, the hand lever plates can be arranged in a direction vertical to the pivot plane of the hand levers in the following sequence: third hand lever plate - first hand lever plate - (if necessary, intermediate space) - second hand lever plate - fourth hand lever plate. Alternatively, it is possible that the hand lever plates are arranged in the direction vertical to the pivot plane of the hand levers in the following sequence: third hand lever plate - first hand lever plate - (if necessary, intermediate space) - fourth hand lever plate - second hand lever plate.

[0017] In this case too, the stop part can have a first and a second longitudinal section, which can also each be cylindrical, with the first longitudinal section having a smaller diameter than the second longitudinal section and then a circular ring-shaped shoulder. The first longitudinal section extends into the third hand lever plate, thus ensuring that the stop part can be held and / or guided on the third hand lever plate. The second longitudinal section extends through the first hand lever plate. The second longitudinal section has a support surface in the end region facing away from the first longitudinal section. In a first direction vertical to the pivot plane of the hand lever, the stop part is then supported on the third hand lever plate via the shoulder, while the support surface formed by the second longitudinal section comes into contact with the second or fourth hand lever plate.In this way, the stop part is caught in both directions vertically to the pivoting plane of the hand levers between the third hand lever plate and the second or fourth hand lever plate.

[0018] In this case too, the stop part can be secured exclusively against unwanted disassembly via the support on the one hand via the shoulder and on the other hand via the support surface, or further cumulative connecting or securing measures can be taken.

[0019] In principle, the stop part can have any geometry and, for example, can also have a non-circular cross-section. For both of the aforementioned possibilities, as already mentioned, the stop part can also be a bolt with any cross-section, in particular a first cylindrical longitudinal section with a first diameter and a second cylindrical longitudinal section with a second diameter, where the second diameter is larger than the first diameter. The shoulder is then formed between the longitudinal sections and is circular in shape to allow for the coaxial arrangement of the two longitudinal sections.

[0020] In principle, the stop of the first hand lever plate can be formed, for example, by a projection on the edge of the hand lever plate. According to a particular proposal of the invention, the stop of the first hand lever plate is formed by an edge boundary of a (blind hole or through-hole) recess in the first hand lever plate. The recess can have an open-edged or closed-edged cross-section.

[0021] There are many different options for shaping the cross-section of the recess within the scope of the invention. One suggestion is for the recess to be an elongated hole. This elongated hole preferably has a curved longitudinal axis that is concentric with the pivot axis of the hand lever defined by the pivot pin. Thus, for the first option, the end region of the first longitudinal section protruding from the third hand lever is received in the elongated hole. For the second option, a longitudinal section of the second longitudinal section adjacent to the shoulder can be received in the elongated hole. For an opening stroke of the pliers actuating assembly, the stop part then moves along the elongated hole. When the maximum opening angle of the hand lever is reached, the stop part comes to rest against an end limit of the elongated hole.

[0022] A further aspect of the invention is dedicated to the assembly and securing of the pivot pin. In this regard, the invention proposes that the pivot pin have two shoulders that are caught between two hand lever plates. In this case, the pivot pin can be secured against unwanted disassembly in both directions vertical to the pivot plane of the hand levers by loosely engaging the shoulders on the two hand lever plates. This can represent the exclusive security or can be achieved with the use of cumulative security measures.

[0023] A further solution to the problem underlying the invention is provided by pliers, in particular crimping pliers, in which a pliers actuating assembly, as previously explained, is coupled to a pliers head 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.

[0024] A further solution to the problem underlying the invention is a method by which a pliers actuation assembly, as previously explained, or a pliers, can be assembled. In this method, the following method steps are carried out: a) The pivot pin is inserted into a bearing eye of the first hand lever plate. It is possible for the pivot pin to have a shoulder by which the pivot pin is secured against unwanted disassembly in the direction of insertion. It is possible for the pivot pin to be inserted into the bearing eye of the first hand lever plate with a clearance or a transition fit. b) The third hand lever plate is then pushed onto the pivot pin by inserting the pivot pin held on the first hand lever plate into a bearing eye of the third hand lever plate. c) The stop part, which is designed according to the aforementioned first possibility, is inserted such that the first longitudinal section extends into the recess or into the elongated hole of the first hand lever plate and through a holding and / or guide bore in the third hand lever plate and the shoulder of the stop part comes into contact with the third hand lever plate.This secures the stop part against unwanted disassembly in the insertion direction. d) The second hand lever plate and the fourth hand lever plate are now pushed onto the pivot pin, completing the pivot bearing to enable the hand levers to be pivoted. When the second hand lever plate and the fourth hand lever plate are pushed on, the end support surface of the second longitudinal section of the stop part is blocked against unwanted disassembly by the second hand lever plate or fourth hand lever plate. It is possible that the second hand lever plate or fourth hand lever plate comes into direct contact with this support surface to ensure this blocking, or that a certain amount of play remains between the support surface and the second or fourth hand lever plate.e) Finally, the first and second hand lever plates are fixed to one another and the third and fourth hand lever plates are fixed to one another. After this fixing, the stop part is caught between the third hand lever plate and the second hand lever plate or fourth hand lever plate as a result of the interaction with the shoulder and the support surface. Although the stop part can only be loosely connected to the hand lever plates, a reliable assembly is achieved, for which the stop part can only be dismantled if the fixing of the first and second hand lever plates as well as the fixing of the third and fourth hand lever plates are released. Accordingly, the pivot pin can also have a further shoulder, via which the pivot pin is supported on the outer hand lever plate by the second hand lever plate or fourth hand lever plate, whereby the pivot pin is also caught between two outer hand lever plates.However, it is also possible that the pivot pin is supported by a shoulder on a hand lever plate of a hand lever, while the pivot pin is then connected to the other hand lever plate of this hand lever via a press fit, while the pivot pin forms a bearing play with bearing eyes of the other hand levers.

[0025] The above-mentioned procedural steps can in principle be carried out in any order or in the order mentioned above.

[0026] Within the scope of the invention, it is possible for further process steps to be carried out between the previously explained process steps. Some of these optional further process steps are listed below as examples only: It is possible that before the second hand lever plates and the fourth hand lever plate (see d)) are pushed on, spacers are also inserted into receiving recesses in the first and third hand lever plates, by means of which the distance between the hand lever plates is specified. These spacers can, for example, have receiving pins in an end region which are received in receiving holes in the hand lever plates via a press fit, or the spacers can be designed as rivets that can be clamped to the receiving holes in the hand lever plates. The spacers can therefore also serve to fix the hand lever plates according to e). It is also possible that before the second and fourth hand lever plates (see d)) are pushed on, pivot pins of tension straps are inserted into bearing eyes of the first and third hand lever plates.Pivot pins of the pull tabs arranged on the other side then engage in bearing eyes of the second and fourth hand lever plates when the second hand lever plate and fourth hand lever plate are pushed on. In this case, the pull tabs (if pivotable mounting) are also caught between the hand lever plates, meaning that the pull tabs can only be dismantled if the hand lever plates are released from their connection to one another. Alternatively or cumulatively, it is possible that before the second hand lever plate and the fourth hand lever plate are pushed on (cf. d)), components of a positive locking mechanism and / or a spring for acting on a pawl of the positive locking mechanism are connected to the first hand lever plate and / or the third hand lever plate by pins or webs entering a receiving bore in the first hand lever plate and / or third hand lever plate.By sliding the second hand lever plate and the fourth hand lever plate on, additional webs or pins can be accommodated in the receptacles of the second and / or fourth hand lever plate, or a shoulder can be supported on the second and / or fourth hand lever plate. In this way, at least one component of the positive locking mechanism or a spring can be mounted and secured against disassembly, with disassembly only being possible for the purpose of releasing the fixation of the hand lever plates to one another.

[0027] Within the scope of the invention, the joining described above with the joining movements a), b), c), and d) (as well as the joining according to the aforementioned supplementary optional assembly steps) preferably takes place with a joining direction oriented vertically to the pivoting plane of the hand levers. This can, under certain circumstances, enable or simplify fully or partially automated assembly.

[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] 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.

[0031] 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

[0032] 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 8 show 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. 14 shows 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. 16shows 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 23 show 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. 25shows 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 exploded view of another pliers actuation assembly. FIGURE DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In the end area 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.

[0036] 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.

[0037] 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 bores 12, 13. In these bores 12, 13, pivot pins 14, 15 of pull tabs 16, 17 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 pivot pins 14a, 14b and pivot pins 15a, 15b on both sides of a base body 20, 21, which are each received in bores 12a, 12b and bores 13a, 13b of the hand lever plates 4a, 4b and 5a, 5b, respectively.

[0038] The pull tabs 16, 17 are linear and designed like struts or rods. In the end regions facing away from the pivot pins 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.

[0039] 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 pivot pins 14, 15 and the coupling elements 22, 23 are an integral part of a single component.

[0040] 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.

[0041] 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.

[0042] 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, with the sleeve 94, can extend 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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°, 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.

[0047] Due to the distance between the frame plates 34, a gap 51 is created between the frame plates 34 (cf. Fig. 4 ), 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.

[0048] Fig. 5 shows the pliers actuation assembly 1 and the pliers head 32 before assembly.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] Fig. 13is a spatial individual part drawing of a pull tab 16, 17, which, as an integral, one-piece component, forms the base body 20, 21, the pivot pins 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.

[0059] 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.

[0060] The embodiment according to the Fig. 1 to 13 represents a possible embodiment of the above "first variant".

[0061] 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.

[0062] 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.

[0063] Fig. 16 and 17 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 designed as coupling bolts 58, 59 in the lower end region, which faces the pliers actuating assembly 1 in the assembled state. 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, serve to connect the frame plates 34a, 34b. For the exemplary embodiment shown, the coupling bolts 58, 59 are stepped in the two end regions and are precisely received in corresponding bores 60a, 60b, 60c, 60d of the frame plates 34a, 34b.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 pivot pins 14, 15, as well as the actuating element 57. The pull tabs 16, 17 are preferably manufactured using a MIN manufacturing process.

[0068] 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 pivot pins 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.

[0069] 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.

[0070] 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).

[0071] 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 .

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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 of 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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 ).

[0082] 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 ).

[0083] 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.

[0084] 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 ).

[0085] 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.

[0086] According to Fig. 32 The pivot pins 14b, 15b of the pull tabs 16, 17 are then inserted into the bores 12b, 13b.

[0087] 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 pivot pin 14a enters the bore 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.

[0088] 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 ).

[0089] This is followed by assembly of the spring 86. For the illustrated embodiment, the spring 86 is designed as a leaf spring 91. A spring base point of the leaf spring 91 has an extension 92, which is received in a receptacle 93 of the third hand lever plate 66. Furthermore, the leaf spring 91 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 ).

[0090] 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 locking blade 85 enters a receptacle 90 of the fourth hand lever plate 67 and a pivot pin 15a enters a bore 13a of the fourth hand lever plate 67 (cf. Fig.36 ).

[0091] In the assembly state thus achieved (or partly already beforehand), the hand lever plates 64, 65, 66, 67 are then fixed. This is done, for example, by connecting, in particular pressing, screwing, riveting or similar, the spacers 87 in 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.

[0092] Finally, the handles 30, 31 are pushed onto the hand lever plates 64, 65, 66, 67 ( Fig. 37 ).

[0093] Fig. 38 shows an alternative embodiment of a pliers actuation assembly 1. For this embodiment, the cylindrical section of the stop part 72 arranged upstream of the shoulder 75 extends only into a holding and / or guide bore 71 of the third hand lever plate 66, on which the shoulder 75 is supported outwardly. The cylindrical section of the stop part 72 with the larger diameter is in this case received and guided in the elongated hole 69. In this case, the frontal support surface 77 of the stop part 72 is slidably guided on the fourth hand lever plate 67. The stop part 72 is thus caught between the contact of the shoulder 75 on the third hand lever plate 66 and the contact of the support surface 77 on the fourth hand lever plate 67 and is thus secured.

[0094] Within the scope of the invention, a pivotable mounting of a spring 86 of the positive locking mechanism, a pawl 85 of the positive locking mechanism and / or pull tabs 16, 17 in recesses or bores of hand lever plates 64, 65 or 66, 67 of a hand lever 2, 3 can also be carried out, wherein the spring 86, the pawl 85 and / or the pull tabs 16, 17 are then caught between the two hand lever plates 64, 65 or 66, 67, as is the subject of the European patent application EP 22 207 540.0 filed on the same day by the applicant, which in this respect is made the subject of the present patent application. LIST OF REFERENCE SYMBOLS

[0095] 1Plier actuation assembly 2Hand lever 3Hand lever 4Hand lever plate 5Hand lever plate 6Bearing eye 7Bearing eye 8Pivot pin 9Pivot bearing 10Crank 11Crank 12Bore 13Bore 14Pivot pin 15Pivot pin 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 60Bore 61Pivot pin 62Bore63Coupling device 64First hand lever plate 65Second hand lever plate 66Third hand lever plate 67Fourth hand lever plate 68Recess 69Elongated hole 70Stop 71Holding and / or guide bore 72Stop part 73First longitudinal section 74Second longitudinal section 75Shoulder 76Annular surface 77Support surface 78First longitudinal section 79Second longitudinal section 80Shoulder 81Annular surface 82Safety lock 83Toothing 84Extension 85Pawl 86Spring 87Spacer 88Receptacle 89Extension 90Receptacle 91Leaf spring 92Extension 93Receptacle 94Sleeve

Claims

1. Pliers actuation assembly (1) which can be coupled to a pliers head for the provision of pliers in a way such that by means of a manual actuation of the pliers actuation assembly a stroke of die halves of the pliers head can be caused, the pliers actuation assembly (1) comprising a) two hand levers (2, 3), one hand lever (2) comprising a first hand lever plate (64) and a second hand lever plate (65) which are rigidly connected to each other and the other hand lever (3) comprises a third hand lever plate (66) and fourth hand lever plate (67) which are rigidly connect to each other, the hand lever plates (64, 65, 66, 67) being arranged parallel to each other, b) a swivel bolt (8) by which the hand levers (2, 3) are connected to each other for being pivoted, c) a stop (70) provided by the first hand lever plate (64) and a stop part (72) held and / or guided on the third lever plate (66), the stop (70) and the stop part (72) establishing a contact with each other for limiting the opening angle of the hand levers (23), characterized in that d) the stop part (72) and / or the swivel bolt (8) comprise / comprises a shoulder (75; 80) which in the assembled state of the pliers actuation assembly (1) contacts the third hand lever plate (66), in particular on the side of the third hand lever plate (66) facing away from the first hand lever plate (64), and is supported in outer direction on the same.

2. Pliers actuation assembly (1) of claim 1, characterized in that the hand lever plates (64, 65, 66, 67) are arranged in parallel planes in the following order in a direction orientated vertically to the pivoting plane of the hand levers (2, 3): a) first hand lever plate (64), third hand lever plate (66), second hand lever plate (65), fourth hand lever plate (67) or b) first hand lever plate (64), third hand lever plate (66), fourth hand lever plate (67), second hand lever plate (65).

3. Pliers actuation assembly (1) of claim 2, characterized in that the stop part (72) a) comprises a first longitudinal section (73) which extends through the third hand lever plate (66) and which interacts in the end section protruding from the third hand lever plate (66) with the stop (70) of the first hand lever plate (64) and b) comprises a second longitudinal section (74) which is connected via the shoulder (75) to the first longitudinal section (73) and comprises a supporting surface (77) in the end section facing away from the first longitudinal section (73), the supporting surface (77) establishing a contact with the second or fourth hand lever plate (65; 57) so that the stop part (72) is trapped between the third hand lever plate (66) and the second or fourth hand lever plate (65; 67) in both directions vertically to a pivoting plane of the hand levers (2, 3).

4. Pliers actuation assembly (1) of claim 1, characterized in that the hand lever plates (64, 65, 66, 67) are arranged in the following order in a direction orientated vertically to the pivoting plane of the hand levers (2, 3): a) third hand lever plate (66), first hand lever plate (64), second hand lever plate (65), fourth hand lever plate (67) or b) third hand lever plate (66), first hand lever plate (64), fourth hand lever plate (67), second hand lever plate (65).

5. Pliers actuation assembly (1) of claim 4, characterized in that the stop part a) comprises a first longitudinal section which extends within or into the third hand lever plate (4b; 5b) and b) comprises a second longitudinal section which is connected via the shoulder to the first longitudinal section, which extends through the first hand lever plate and which comprises a supporting surface in the end section facing away from the first longitudinal section, the supporting surface establishing a contact with the second or fourth hand lever plate so that the stop part is trapped in both directions vertically to a pivoting plane of the hand levers between the third hand lever plate and the second or fourth hand lever plate.

6. Pliers actuation assembly (1) of claim 3 or 5, characterized in that the stop part (72) is a bolt having a first cylindrical longitudinal section (73) with a first diameter and a second cylindrical longitudinal section (74) with a second diameter, the second diameter being larger than the first diameter and the shoulder (75) being formed between the longitudinal sections (73, 74), the shoulder (75) preferably having a circular ring shape.

7. Pliers actuation assembly (1) of one of the preceding claims, characterized in that the stop (70) of the first hand lever plate (4a; 5a) is formed by an edge limitation of a recess (68) of the first hand lever plate (64).

8. Pliers actuation assembly (1) of claim 7, characterized in that the recess (68) is an elongated hole (69) which preferably has a curved longitudinal axis being arranged concentrically to the pivot axis of the hand levers (2, 3) defined by the swivel bolt.

9. Pliers actuation assembly (1) of one of the preceding claims, characterized in that the swivel bolt (8) comprises two shoulders which are trapped between the two hand lever plates.

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

11. Method for the assembly of a pliers actuation assembly (1) of one of claims 1 to 9 or of pliers (52) according to claim 10, the method comprising the following method steps: a) inserting the swivel bolt (8) into a bearing lug (6b) of the first hand lever plate (64); b) sliding the third hand lever plate (66) onto the swivel bolt (8); c) inserting the stop part (72) in a way such that the first longitudinal section (73) extends in the recess (68) or in the elongated hole (69) of the first hand lever plate (64) and through a holding and / or guiding bore (71) of the third hand lever plate (66) and the shoulder (75) establishes a contact with the third hand lever plate (66); d) sliding the second hand lever plate (65) and the fourth hand lever plate (67) onto the swivel bolt (8) and blocking the supporting surface (77) of the second longitudinal section (74) of the stop part (72) against an undesired disassembly by the second hand lever plate (65) or fourth hand lever plate (67), e) fixing the first and second hand lever plates (64, 65) on each other and fixing the third and fourth hand lever plates (66, 67) on each other, so that the swivel bolt (8) and / or the stop part (72) are / is trapped between two hand lever plates (65, 66).