CRIMP pliers, crimping pliers head, crimping pliers actuation assembly and method for assembling crimping pliers

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a crimping tool used for pressing or crimping (hereinafter "crimping") a workpiece, which is in particular a connector with a cable arranged therein. Using the crimping tool, for example, a so-called "conductor crimp" can be achieved by crimping a contact area of ​​the connector to the electrical conductor of the cable and / or an so-called "insulation crimp" can be achieved by crimping a clamping area of ​​the connector to the insulation sheath of the cable. Regarding possible applications of such a crimping tool, reference is made to the crimping tools offered and described on the website www.wezag.de.

[0002] Furthermore, the invention relates to a crimping pliers head and a crimping pliers actuation assembly of a crimping pliers and a method for assembling a crimping pliers. STATE OF THE ART

[0003] 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 actuation 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 actuation 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. OBJECT OF THE INVENTION

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

[0005] Furthermore, the invention is based on the object of proposing an improved crimping pliers actuation assembly and an improved crimping pliers head in this context. Finally, the invention is based on the object of proposing an improved method for assembling such a crimping pliers. 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] The invention relates to a crimping pliers having two hand levers pivotally connected to each other via a pivot pin. Two pull tabs are articulated on the hand levers at a distance from the pivot pin. The crimping pliers have a crimping pliers head. The crimping pliers head has a pliers head frame, a spring device, and a die half. This die half is slidably guided on the pliers head frame in the direction of a crimping axis. The die half is supported on the pliers head frame via the spring device in such a way that the spring device urges the die half in an opening direction. The spring device can thus bring about automatic opening of the die halves (and thus, under certain circumstances, also the hand levers) at the end of a crimping stroke. The die half has a pivot pin receptacle that is open on one side.

[0008] In the crimping pliers according to the invention, at least one pull tab is pivotably connected to the pliers head frame via a coupling device. To simplify the description, it is assumed in the following that both pull tabs are each pivotably connected to the pliers head frame via a coupling device, although this is not necessarily the case.

[0009] When the crimping tool is assembled, the pivot pin is positioned in the pivot pin receptacle. Due to the described type of pivot connections and the resulting kinematics, pivoting the hand levers causes a relative movement of the movable die half relative to the tool head frame. For example, pivoting the hand levers in the closing direction can initiate the crimping stroke with the closing of both die halves.

[0010] According to the invention, it is proposed that, in contrast to the prior art mentioned at the outset, holes with a closed cross-section, which require the insertion of the coupling bolts vertically to the pliers head plane, are not used as coupling recesses for coupling the pull tabs to the pliers head frame. Instead, the invention uses coupling devices for coupling the pull tabs to the pliers head frame, each of which has a coupling recess open on one side and a coupling element. The coupling between the coupling recess and the coupling element (and thus also the coupling between the pull tabs and the pliers head frame) can be achieved by means of a relative pivoting between the coupling recess and the coupling element in the direction of the pliers head plane.In particular, this coupling does not require the insertion of a coupling pin vertically to the plane of the pliers head, as is the case with the prior art mentioned above. Rather, the coupling achieved according to the invention can be achieved and released particularly easily by inducing the necessary relative pivoting, with which the coupling element enters the coupling recess via the edge opening. Entry occurs here with a movement in the plane of the pliers head (or parallel thereto) and on a circular path around the pivot bearing with which the pull tab is articulated to the associated hand lever.

[0011] At the same time, the invention takes into account the requirement to prevent the coupling from accidentally disengaging when using the crimping pliers. This is ensured according to the invention by the spring device, which is responsible for applying pressure to the movable die half in the opening direction, securing the coupling between the coupling recess and the coupling element. This means that the spring device generates a spring force that holds the coupling element in the coupling position in the coupling recess. To disengage the coupling, not only must the coupling element be pivoted out of the coupling recess, but this pressure must also be overcome by the spring device.

[0012] Within the scope of the invention, it is possible to implement additional coupling measures after such coupling and securing of the coupling. However, reliable coupling is preferably ensured exclusively by the described interaction between the coupling recesses and the coupling elements and the securing by the spring device.

[0013] According to a further proposal of the invention, the coupling recesses are designed and their openings are oriented such that they define the entry directions of the coupling elements into the coupling recesses, which are inclined at an acute angle to the crimping axis. For example, the coupling recesses are designed as outwardly open elongated holes or as U-shaped receptacles, whereby the side legs of the U can also diverge as desired and / or be straight or curved. The inclination of the coupling recesses at the acute angle results in the spring device generating an application force component dependent on the acute angle, which tends to push or pull the respective coupling element into the coupling recess and toward the bottom of the coupling recess.On the other hand, the acute angle has the consequence that the coupling elements cannot be moved transversely to the crimping axis, but collide with the boundary of the coupling recess, thus ensuring protection against an unwanted exit of the coupling element from the coupling recess.

[0014] In the following, two different variants for the inventive design of the crimping pliers are explained, without restricting the invention to these variants: a) For a first variant, the coupling recesses are formed by the pliers head frame. For example, the coupling recesses can be formed in the end region facing the crimping pliers actuation assembly and laterally outwardly from the pliers head frame. In this case, the longitudinal axis of the coupling recesses preferably extends in the plane of the pliers head. In this case, however, the coupling elements are coupling bolts, coupling pins, or coupling extensions of the pull tabs. These are arranged in the end regions of the pull tabs facing away from the articulation on the hand levers and extend vertically to the plane of the pliers head.

[0015] For this first variant, it is possible for the pliers head frame to have two parallel frame plates, whereby the pliers head frame can essentially correspond to the state of the art introduced above in this regard and with regard to the reception and guidance of the die halves. In this case, however, the two frame plates each have a coupling part recess, which together form the coupling recess. In this respect, the pliers head frame thus differs from the pliers head frame according to DE 100 056 900 C1.

[0016] A pull tab can have a base body and aligned coupling bolts, coupling pins, or coupling extensions arranged on both sides of the base body, which extend vertically to the plane of the pliers head. The base body, on the one hand, and the coupling bolts, coupling pins, or coupling extensions, on the other hand, can be formed from an integral, one-piece component, or they can be formed as separate components and firmly connected to one another in the pull tab. For this configuration, the base body, in the pivoted-in state, extends into the space between the frame plates, while in the assembled state, the coupling bolts, coupling pins, or coupling extensions are arranged in the coupling part recesses.

[0017] If the base body and the coupling bolts, coupling pins or coupling extensions form one-piece pull tabs, these can be manufactured, for example, using an MIM manufacturing process.

[0018] A further improved interaction between the pull tabs and the pliers head frame can result if, according to a further proposal, the coupling bolts, coupling pins, or coupling extensions have an extension in the end region facing away from the base body. In this case, the frame plates can each be caught between this extension and the base body. This allows the pivoting insertion of the coupling bolts, coupling pins, or coupling extensions into the coupling recess for assembly and disassembly, while vertically to the pliers head plane, protection against unwanted movements can be ensured by the frame plates being caught between an extension and the base body. b) For a second variant of the crimping pliers, the pull tabs are formed by the coupling recesses.In this case, the coupling elements are designed as coupling bolts, coupling pins, or coupling extensions formed by the pliers head frame or supported by the pliers head frame. When the pull tabs are pivoted into the assembly position for assembly, the coupling bolts, coupling pins, or coupling extensions of the pliers head frame engage the coupling recesses of the pull tabs, thus enabling a coupling secured by the spring device, as previously explained.

[0019] For the second variant, the pliers head frame can also have two parallel frame plates, which can then be connected to each other via a coupling bolt. In this case, the coupling bolt that connects the frame plates can also be used multifunctionally: The pull tab has a base body that forms the coupling recesses and extends into the space between the frame plates. The coupling bolt that connects the frame plates is then arranged in the coupling recesses.

[0020] It is fundamentally possible within the scope of the invention for the pull tabs to run inside the pliers head in the assembled position, so that they can be covered by the pliers head frame or the frame plates when viewed vertically to the pliers head plane. This can apply to selected operating positions of the crimping pliers, a partial crimping stroke, or during the entire crimping stroke. For one proposal of the invention, actuating elements protruding laterally from the pliers head frame (permanently, for a partial crimping stroke and in particular the open position) are provided on the pull tabs. These actuating elements can be, for example, wings, extensions, gripping surfaces, etc. Forces can be applied manually to the pull tabs via these actuating elements, which can then pivot the pull tabs into the assembled position or pivot the pull tabs for disassembly.

[0021] A further proposal of the invention addresses the need for the user to move the movable die half in the closing direction, counter to the spring force, in order to mount the crimping pliers actuation assembly on the crimping pliers head and to enable the coupling elements to enter the coupling recesses. The simultaneous induction of relative movements between the coupling elements and the coupling recesses, on the one hand, and the movement of the movable die half in the closing direction, on the other, can place increased demands on the installer. A proposal of the invention provides a remedy for this problem, according to which the pull tabs and the movable die half have contact surfaces that come into contact with one another during assembly.The contact surfaces are oriented such that assembly forces applied to the pull tabs are converted into a force component that increases the load on the spring device and causes the movable die half to move in the closing direction. Thus, if an assembler pivots the pull tabs to establish the coupling and applies an assembly force oriented toward the coupling position to the pull tabs, one force component of the assembly force is used to actually cause the coupling element to enter the coupling recess. Another force component ensures the movement of the movable die half in the closing direction required for this entry of the coupling element into the coupling recess. This significantly simplifies handling during assembly.

[0022] A further solution to the invention underlying the object is a crimping pliers head designed for a crimping pliers of the type described above, in particular according to the first variant. This crimping pliers head has coupling devices that form coupling recesses open on one side. These are preferably partial coupling recesses in the frame plates, which are arranged as open slots or receptacles with an open-edged cross-section in the end regions of the frame plates facing the crimping pliers actuation assembly, as well as in the region of the frame plates laterally outer with respect to the crimping pliers.

[0023] A further solution to the problem underlying the invention is a crimping pliers actuating assembly for a crimping pliers of the type described above, in particular according to the second variant. The crimping pliers actuating assembly has two hand levers that are pivotally connected to one another via a pivot pin. Two pull tabs are articulated to the hand levers at a distance from the pivot pin. The pull tabs have coupling devices via which the crimping pliers actuating assembly can be coupled to a crimping pliers head. In this case, the pull tabs are coupling recesses open on one side, which can also be designed as elongated holes open on one side or other receptacles with an open-edged cross-section.

[0024] A further solution to the problem underlying the invention is a method for assembling a crimping tool of the type described above. In this method, the pivot pin is inserted into the pivot pin receptacle of the die half. Simultaneously or subsequently, the pull tabs are connected to the crimping tool head by inserting the coupling elements into the coupling recesses while simultaneously compressing the spring device in such a way that, as a result of the spring device's action, the coupling elements are secured against re-emerging from the coupling recesses.

[0025] It is possible that the entry of the coupling elements into the coupling recesses is brought about by a manual actuation of the previously explained actuating elements protruding laterally from the pliers head frame and / or the movement of the movable die half in the closing direction, which is intended for the entry, is brought about via the previously explained contact surfaces between the pull tabs and the movable die half.

[0026] Advantageous further developments of the invention emerge from the patent claims, the description and the drawings.

[0027] 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.

[0028] 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.

[0029] 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

[0030] 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 crimping tool actuation assembly of a crimping tool. Fig. 2 shows in a spatial representation the crimping tool actuation assembly of a crimping tool according to Fig. 1 in assembled condition. Fig. 3shows in an exploded view a crimping tool head of a crimping tool, which together with a crimping tool actuation assembly according to Fig. 1 and 2 can be used. Fig. 4 shows in a spatial representation the crimping pliers head of a crimping pliers according to Fig. 3 in assembled condition. Fig. 5 to 8 show in spatial representations the assembly and operation of a crimping tool with a crimping tool actuation assembly according to Fig. 1 and 2 and a crimping pliers head according to Fig. 3 and 4 . Fig. 9 shows a partially assembled state of a crimping tool according to Fig. 5 to 8 in a top view of the pliers head plane. Fig. 10 shows the crimping 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 crimping pliers according to Fig. 5 to 10 in a closed position in a top view of the pliers head plane. Fig. 12shows the crimping 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 crimping tool actuation assembly according to Fig. 1 and 2 and a crimping pliers according to Fig. 5 to 12 . Fig. 14 shows an exploded view of another embodiment of a crimping tool actuation assembly. Fig. 15 shows in a spatial representation the assembled crimping tool actuation assembly according to Fig. 14 . Fig. 16 shows an exploded view of a crimping tool head which, together with a crimping tool actuation assembly according to Fig. 14 and 15 can be used. Fig. 17 shows the crimping pliers head according to Fig. 16 in assembled state in a spatial representation. Fig. 18 to 21 show a crimping tool having a crimping tool actuation assembly according to Fig. 14and 15 and a crimping 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 crimping pliers actuation assembly according to Fig. 14 and 15 and a crimping pliers according to Fig. 18 to 21 . FIGURE DESCRIPTION

[0031] In the following description, some components or features that may correspond or be similar in terms of design, geometry and / or function are identified by the same reference numerals, whereby these may then be differentiated from one another by a supplementary letter a, b, ... In this case, reference may be made to the components or features with or without the supplementary letter; without the supplementary letter, one component or feature, several components or features, or all components or features may be addressed.

[0032] Fig. 1 shows a crimping pliers actuation assembly 1. The crimping 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.

[0033] In the end area facing away from the handle part of the hand levers 2, 3, the hand levers 2, 3 each have a bore 6, 7, which are designed here as bores 6a, 6b of the hand lever plates 4a, 4b and as bores 7a, 7b of the hand lever plates 5a, 5b.

[0034] The bores 6, 7 form bearing eyes 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 stroke and an opening stroke.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Fig. 2shows the crimping 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 crimping 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.

[0039] Fig. 3shows a three-dimensional exploded view of a crimping pliers head 32. The crimping 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.

[0040] The crimping pliers head 32 further comprises a movable die half 37. The movable die half is guided on the pliers head frame 33 for displacement along a crimping 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, together with the sleeve 64, 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.

[0041] 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 crimping pliers actuating assembly 1, toward the crimping pliers actuating assembly 1.

[0042] The crimping 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 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.

[0043] 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.

[0044] For the illustrated embodiment, the coupling recesses 45, 46 and the coupling recess parts 47, 48 are designed as elongated holes 49 open on one side in the outer end region. The elongated holes 49 are inclined at an acute angle 50 relative to the crimping 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 crimping pliers actuating assembly 1, so that an entry movement from the outside into the elongated hole 49 has a component oriented in the direction of the pivot pin receptacle 41 and the crimping 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.

[0045] Due to the distance between the frame plates 34, a gap 51 is created between the frame plates 34 (see 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 64, which defines the spacing of the frame plates 34 in the area of ​​the rivet 36c.

[0046] Fig. 5 shows the crimping tool actuation assembly 1 and the crimping tool head 32 before assembly.

[0047] According to Fig. 6For assembly, the crimping pliers actuating part 1 is brought closer to the crimping 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 crimping pliers actuating assembly 1 and the crimping 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.

[0048] 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.

[0049] 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 stroke and is, for example, less than 20%, less than 15% or less than 10% of the crimping 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 maximally open position. Preferably, however, a partial closing path remains, which may, for example, be less than 10% or less than 5% of the crimping 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.In the assembled state, the extensions 28a, 28b, 29a, 29b of the pull tabs 16, 17 can prevent or reduce undesirable springing of the frame plates 34a, 34b as a result of the forces acting during the crimping stroke.

[0050] If a crimping tool 52 formed by assembling the crimping tool actuation assembly 1 and the crimping tool head 32 is Fig. 7 used to crimp a workpiece, the operator closes the hand levers 2, 3, which causes the crimping stroke to run through. Fig. 8 shows the crimping pliers 52 at the end of the crimping stroke, where the hand levers 2, 3 and the die halves 35, 37 are closed.

[0051] 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.

[0052] Fig. 9shows the partially assembled state of the crimping pliers 52 at the time the coupling elements 22, 23 enter the coupling recesses 45, 46, whereby some parts of the crimping pliers 52 are omitted for better illustration.

[0053] In a corresponding partial assembly position, Fig. 10 the crimping 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.

[0054] Finally, show Fig. 11 and 12 the Fig. 9 and 10 corresponding representations, but here the crimping pliers 52 are shown in the closed position at the end of the crimping stroke.

[0055] 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 that 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 crimp 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.

[0056] 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.

[0057] 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.

[0058] The embodiment according to the Fig. 1 to 13 represents a possible embodiment of the above "first variant".

[0059] In the Fig. 14 to 21 A further embodiment of the crimping pliers actuating assembly 1, the crimping pliers head 32, and the crimping pliers 52 formed with the crimping pliers actuating assembly 1 and the crimping 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.

[0060] The Fig. 14 and 15The crimping 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 crimping pliers actuating assembly 1 is designed according to the Fig. 1 and 2 shown and described crimping pliers actuation assembly.

[0061] Fig. 16 and 17 show the crimping 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 crimping 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 crimping 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.

[0062] Fig. 18 to 21show the crimping pliers 52 formed with the crimping pliers head 32 and the crimping pliers actuation assembly 1 in different assembly states: According to Fig. 18 Crimping pliers head 32 is removed from crimping pliers actuation assembly 1. The pivot pin receptacle 41 of crimping pliers head 32 is freely accessible on the side facing crimping pliers actuation assembly 1. The pivot pin 8 and the pull tabs 16, 17 of crimping pliers actuation assembly 1 are also freely accessible on the side facing crimping pliers head 32, whereby the pull tabs 16, 17 can be freely pivoted in the plane of the pliers head.

[0063] According to Fig. 19The crimping pliers actuating assembly 2 has been brought closer to the crimping 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 crimping 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 exemplary embodiment apply accordingly.

[0064] 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 stroke until the Fig. 21 The closed position shown is reached.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The coupling recesses 45, 46 and the coupling elements 22, 23 form coupling devices 63, via which the crimping pliers head 32 can be mounted to and dismounted from the crimping pliers actuating assembly 1 (in particular without the use of a tool). LIST OF REFERENCE SYMBOLS

[0069] 1 Crimping pliers actuation assembly 2 Hand lever 3 Hand lever 4 Hand lever plate 5 Hand lever plate 6 Bore 7 Bore 8 Pivot pin 9 Pivot bearing 10 Offset 11 Offset 12 Bore 13 Bore 14 Pivot pin 15 Pivot pin 16 Pull tab 17 Pull tab 18 Pivot bearing 19 Pivot bearing 20 Base body 21 Base body 22 Coupling element 23 Coupling element 24 Coupling element part 25 Coupling element part 26 Coupling pin 27 Coupling pin 28 Extension 29 Extension 30 Handle 31 Handle 32 Crimping pliers head 33 Plier head frame 34 Frame plate 35 Fixed die half 36 Rivet 37 Movable die half 38Crimp 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 52Crimp pliers 53Contact surface 54Contact surface 55Acute angle 56Plate body 57Actuating element 58Coupling pin 59Coupling pin 60Bore 61Pivot pin 62Bore 63Coupling device64Hülse

Claims

1. Crimping pliers (52) comprising a) two hand levers (2, 3), b) a pivot bolt (8) via which the hand levers (2, 3) are pivotably connected to one another, c) two pulling bars (16, 17) linked to the hand levers (2, 3) at a distance from the pivot bolt (8), d) a crimping pliers head (32) with da) a pliers head frame (33), db) a spring device (43) and dc) a die half (37), which - is guided displaceably in the direction of a crimping axis (38) on the pliers head frame (33), - is supported by the spring device (43) on the pliers head frame (33) in such a way that the spring device (43) biases the die half (37) in an opening direction, and - has a pivot bolt accommodation (41) which is open on one side, e) the pulling bars (16, 17) being connected to the pliers head frame (33) via coupling devices (63), the pivot bolt (8) being arranged in the pivot bolt accommodation (41), a pivoting of the hand levers (2, 3) causing a relative movement of the die half (37) with respect to the pliers head frame (33), and a movement of the die half (37) and a pivoting of the hand levers (2, 3) taking place in a pliers head plane, characterized in that f) at least one coupling device (63), preferably both coupling devices, has / have a coupling recess (45; 46) open on one side and a coupling element (22; 23), wherein the coupling between the coupling recess (45; 46) and the coupling element (22; 23) fa) can be established by means of a pivoting movement of the pulling bar (16, 17) in the pliers head plane and by means of an entry of the coupling element (22; 23) into the coupling recess (45; 46) brought about by this pivoting movement, and fb) is secured by the spring device (43).

2. Crimping pliers (52) of claim 1, characterized in that the coupling recesses (45; 46) define entry directions of the coupling elements (22; 23) into the coupling recesses (45; 46), the entry directions being inclined at an acute angle (50) with respect to the crimping axis (38).

3. Crimping pliers (52) of claim 1 or 2, characterized in that a) the coupling recesses (45; 46) are formed by the pliers head frame (33) and / or b) the coupling elements (22; 23) are coupling bolts (58; 59), coupling pins (26; 27) or coupling protrusions of the pulling bars (16; 17).

4. Crimping pliers (52) of claim 3, characterized in that a) the pliers head frame (33) comprises two frame plates (34a, 34b) extending parallel to each other and each having a coupling part recess (47a, 47b, 48a, 48b), and b) a pulling bar (16; 17) has a base body (20; 21) and aligned coupling bolts, coupling pins (26a, 26b, 27a, 27b) or coupling protrusions arranged on both sides of the base body (20; 21), c) the base body (20; 21) extending into an interspace (51) between the frame plates (34a, 34b) and the coupling bolts, coupling pins (26a, 26b, 27a, 27b) or coupling protrusions being arranged in the coupling part recesses (47a, 47b, 48a, 48b).

5. Crimping pliers (52) of claim 4, characterized in that the base body (20; 21) and the coupling bolts, coupling pins (26a, 26b, 27a, 27b) or coupling protrusions form one-piece pulling bars (16; 17), which are in particular produced in a MIM manufacturing process.

6. Crimping pliers (52) of claim 4 or 5, characterized in that coupling bolts, coupling pins (26a, 26b, 27a, 27b) or coupling protrusions comprise an end-sided extensions (28a, 28b, 29a, 29b) and the frame plates (34a, 34b) are each trapped in a direction vertical to the pliers head plane between one extension (28a, 28b, 29a, 29b) and the base body (20; 21).

7. Crimping pliers (52) of claim 1 or 2, characterized in that a) the coupling recesses (45; 46) are formed by the pulling bars (16; 17) and / or b) the coupling elements (22; 23) are coupling bolts (58; 59), coupling pins or coupling protrusions formed by the pliers head frame (33) or supported by the pliers head frame (33).

8. Crimping pliers (52) of claim 7, characterized in that a) the pliers head frame (33) comprises two frame plates (34a, 34b) extending parallel to each other and connected to each other via a coupling bolt (58; 59), and b) a pulling bar (16; 17) has a base body (20; 21) which forms the coupling recesses (45; 46) and extends into an interspace (51) between the frame plates (34a, 34b), c) the coupling bolt (58; 59) connecting the frame plates (34a, 34b) being arranged in the coupling part recesses (47; 48).

9. Crimping pliers (52) of one of the preceding claims, characterized in that the pulling bars (16; 17) comprise actuating elements (57) protruding laterally or horizontally out of the pliers head frame (33).

10. Crimping pliers (52) of one of the preceding claims, characterized in that the pulling bars (16; 17) and the movable die half (37) comprise contact surfaces (53, 54) which convert assembly forces applied to the pulling bars (16; 17) into a force component which results in an increase of the bias of the spring device (43) and a movement of the movable die half (37) in the closing direction.

11. Crimping pliers (52) of one of the preceding claims, characterized in that in the end regions facing away from the crimping pliers head (32) the pulling bars (16) comprise protrusions or pivot pins (14, 15) which are rotatably accommodated in bores (12, 13) of parallel hand levers plates (4; 5) of the hand levers (2, 3).

12. Crimping pliers head (32) for crimping pliers (52) according to one of claims 3 to 6 and 10 or 11 with a pliers head frame (33) with coupling devices (63), by which the crimping pliers head (32) can be coupled to a crimping pliers actuation assembly (1), characterized in that the coupling devices (63) are designed as coupling recesses (45, 46) being open on one side.

13. Crimping pliers actuator assembly group (1) for crimping pliers according to one of claims 7 to 11, comprising a) two hand levers (2, 3), b) a pivot bolt (8), by which the hand levers (2, 3) are pivotably connected to each other, and c) two pulling bars (16, 17) linked to the hand levers (2, 3) at a distance from the pivot bolt (8) and comprising coupling means (63) by which the crimping pliers actuating assembly group (1) can be coupled to a crimping pliers head (32), characterized in that d) the pulling bars (16; 17) comprise coupling recesses (45, 46) being open on one side.

14. Method for assembling crimping pliers (52) with a) two hand levers (2, 3), b) a pivot bolt (8) by which the hand levers (2, 3) are pivotably connected to each other. c) two pulling bars (16, 17) linked to the hand levers (2, 3) at a distance from the pivot bolt (8), d) a crimping pliers head (32) with da) a pliers head frame (33), db) a spring device (43) and dc) a die half (37), which - is guided displaceably in the direction of a crimping axis (38) on the pliers head frame (33), - is supported by the spring means (43) on the pliers head frame (33) in such a way that the spring device (43) biases the die half (37) in an opening direction, and - comprises a pivot bolt accommodation (41) being open on one side, e) the pulling bars (16; 17) being connected to the pliers head frame (33) via a coupling device (63), the pivot bolt (8) being arranged in the pivot bolt accommodation (41) and a pivoting of the hand levers (2, 3) in a closing direction causing a relative movement of the die half (37) with respect to the pliers head frame (33) in closing direction and f) the coupling devices (63) each comprising a coupling recess (45, 46) being open on one side and a coupling element (22, 23), the coupling element (22, 23) being inserted into the coupling recess (45, 46) and being secured by the spring device (43) against exiting from the coupling recess (45, 46), in particular crimping pliers (52) of one of claims 2 to 11, with the following method steps: a) inserting the pivot bolt (8) into the pivot bolt accommodation (41) of the die half (37) and b) connecting the pulling bars (16, 17) to the crimping pliers head (32) by entering of the coupling elements (22, 23) into the coupling recesses (45, 46) with simultaneous compression of the spring device (43) in such a way that as a result of the bias by the spring device (43) the coupling elements (22, 23) are secured against exiting from the coupling recesses (45, 46).