EP2082837A1 - Crimping pliers - Google Patents

Abstract

Pressing tongs (1) comprises a closing mechanism (48) which is actuated depending on hand levers (2, 3) and pressing jaws (23, 24) which move from an opening position into a closed position using the closing mechanism. The pressing jaws are secured in the starting position to prevent a return to the opening position. Preferred Features: The closing mechanism is formed as a ratchet mechanism.

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a pressing tongs for manually operated pressing of a workpiece, such as a socket, a fitting, pipes, cable lugs and the like.

STATE OF THE ART

For generic pressing tongs, which may also include so-called crimping tools, various embodiments with different transfer mechanisms between hand levers and press jaws are known, the structural design is dependent on the requirement that at reasonable hand applied by the hand of the user hand forces large pressing forces must be achieved, but a comfortable operation of the pressing tongs is possible.

A generic pressing tongs for manually operated pressing of sockets, pipes, cable lugs and similar workpieces is from the patent DE 199 63 097 C1 the applicant known. In this pressing tongs two hand levers are manually operated. The movement of the hand lever and applied to the hand lever hand forces are transmitted under suitable translation via a transmission mechanism on the dies, between which the workpiece can be pressed.

DE 1 275 490 A discloses a forceps-like hand tool with two hand levers, with the pivoting of a cam can be rotated. The cam operates a toggle mechanism, which in turn actuates jaws of the pliers-like hand tool. about a pawl, the movement of the cam at the end of individual partial strokes of a Mehrfachhubes be locked.

OBJECT OF THE INVENTION

• über einen neuen Übertragungsmechanismus verfügt und/oder
• eine verbesserte Betätigung in unterschiedlichen Einsatzbedingungen der Presszange ermöglicht.

The present invention has for its object to provide a pressing tongs, which

• has a new transmission mechanism and / or
• allows improved operation in different conditions of use of the pressing tongs.

SOLUTION

The object of the invention is achieved with a pressing tongs according to the features of independent claim 1. Further embodiments of a pressing tongs invention arise according to the features of the dependent claims 2 to 16.

DESCRIPTION OF THE INVENTION

According to the pressing tongs can not be operated exclusively on the hand lever. Rather, the pressing tongs has a closing mechanism which can be actuated independently of the hand levers for the workpiece inserted into the pressing jaws. By actuating the closing mechanism, the pressing jaws are movable from an open position into a partially closed starting position. In this case, the starting position can still ensure a clearance between the workpiece and the pressing jaws or a die arranged in the pressing jaws. In particular, a game between the workpiece and the die and die in the open position is overcome over the locking mechanism, so that in the starting position the pressing jaws come to rest on the workpiece. Thus, a partial stroke is accomplished by the locking mechanism in which no pressing forces act. It is also conceivable that a first pressing of the workpiece already takes place via the said closing mechanism.

The starting position of the pressing jaws represents a stable operating state of the pressing tongs with a workpiece arranged therein, since in the starting position the pressing jaws are secured against a return to the open position according to the invention. Thus, pressing tongs and workpiece can already enter a play-afflicted or backlash-free connection, so that under certain circumstances, even for a release of the hands of the pressing tongs or the tool a firm or loose connection between pressing tongs and workpiece is given.

Starting from the starting position, a further partial stroke of the pressing jaws can be brought to one another via a movement of the hand lever. In summary, it can be stated that according to the invention a partial stroke of the pressing jaws can be brought about via the closing mechanism, while another partial stroke or optionally also the same partial stroke can be brought about via the hand lever.

Preferably, the translation of the transmission mechanism between the hand levers and the pressing jaws is provided with a translation of the manual actuating forces which is greater than the translation of a force applied by the user's hands to the closing mechanism to the pressing jaws. This can be done quickly overcoming the first partial stroke, if this example. Is designed as an idle stroke or no great resistance to a pressing is caused, while in the actual idle stroke a good pressing action is generated.

It is quite conceivable that the starting position reached at the end is structurally predetermined for the closing mechanism with a defined position of the pressing jaws, so that the partial stroke between the open position and the starting position is fixed. Preferably, however, the invention proposes that different starting positions can be brought about via the closing mechanism, for example for workpieces with different dimensions. These starting positions can be predetermined in steps, so that the partial stroke between the open position and the starting position can be changed stepwise depending on the workpiece arranged in the pressing tongs. Here, a default of the initial position by an adjustment on the pressing tongs done, or there is an automatic adjustment of the starting position to the dimension of the respective workpiece. It is also possible that the producible starting position is infinitely adaptable, for example by a closing movement is brought about by the closing mechanism until the Pressing jaws or a die arranged therein rests against the lateral surface of the workpiece or applied pressing forces are below a defined force level.

The induced via the locking mechanism different starting positions can be ensured in a variety of constructive ways. For example, an adjustable stop to specify the starting position can be provided. However, a particularly simple but efficient specification of the different starting positions can be done by using a locking or ratchet mechanism (hereinafter ratchet mechanism) in the locking mechanism in which, for example, several locking points over the partial stroke of the open position are overcome to the starting position, the opening of the Avoid press jaws from a position once reached. The starting position is reached when the pressing jaws rest in the closing direction on the lateral surface of the workpiece, while in the opening direction, a fuse via the ratchet mechanism. Here, it is also possible that over the distance of individual locking stages of the ratchet mechanism preferred starting positions are given, in such a preferred starting position still a game between die and workpiece remains, but the next detent step in the closing direction can not be achieved via the locking mechanism, because this a pressing of the workpiece would be required to an extent which is not caused by the locking mechanism alone.

It is entirely possible that in the pressing tongs any transfer mechanism is used, as this is known in many ways from the prior art to pressing tongs. It is also irrelevant for the pressing tongs according to the invention whether the pressing jaws execute a pivoting movement about a common axis in the course of the closing movement or the pressing jaws, for example, execute a translatory relative movement. However, a particular proposal of the invention is dedicated to an advantageous transmission mechanism. This is designed with two toggle levers, which are pivotally connected to each other in the region of a toggle joint. In this case, the end regions of the toggle levers, which face away from said toggle lever joint, are each connected in an articulated manner to an associated pressing jaw. In this case, the pressing jaws are pivoted in accordance with the movement of the toggle lever in the course of a closing movement. An actuation of the pressing tongs, that is to say a bringing about a closing movement of the pressing jaws, takes place in that a cam disk, which can also be designed as a type of cam, is provided. Corresponding to the contour of the cam disk, the toggle lever joint is displaced with a movement of the cam disk, which is accompanied by a closing movement of the pressing jaws. This embodiment of the invention is based on the recognition that in itself the use of a toggle joint for generating large pressing forces is advantageous anyway. Thus, by the toggle lever due to the geometric conditions, an applied to the toggle lever actuating force is already enhanced at appropriate knee lever angles. In addition, the invention utilizes the power transmission via a cam, wherein depending on the contour of the cam, a further amplification of the actuating force can be made by a force applied to the cam force / torque to the cheek plates. According to the invention, therefore, a "double translation" due to the translation of the cam to the toggle joint on the one hand and from the toggle joint to the pressing jaws on the other hand used. It should be noted that - according to the embodiment shown in the figure description - a hinged to a toggle cheek with an operation of the knee lever can be pivoted to bring about the closing movement. However, the hinged to a toggle press jaw can also perform a translational movement to bring about a translational closing movement, as for example for the DE 44 14 967 A1 known transmission mechanism is known. A transmission mechanism based on such a translational movement of at least one pressing jaw is also to be encompassed by the present invention.

For a further development of the pressing tongs according to the invention, the cam disk is coupled to the ratchet mechanism, so that the different locking positions of the ratchet mechanism are assumed with a translatory or rotary movement of the cam disk.

For a particularly advantageous embodiment, the cam is non-rotatably connected to an actuating element which is arranged on the outside of the pliers or the pliers head. About the actuator of the closing mechanism of the pressing pliers can be actuated. An adjusting element may in particular be an adjusting wheel, whose rotation is accompanied by a movement of the cam plate directly or with the interposition of a geared connection for further translation. An increase of manually applied to the actuator forces can, for example, by designing the Diameter of a control element designed as a setting made. Alternatively, the actuator can be designed as a kind of lever, slide or the like.

In principle, it is possible for the mentioned opening position of the pressing tongs to be the position for which the pressing jaws are open the furthest. For a variant according to the invention, however, the pressing jaws are, starting from the stable open position, to be opened further into an insertion position. In this insertion position, a workpiece can be introduced into the die halves of the pressing jaws. The pressing jaws are brought by manual relative movement of the pressing jaws in the said insertion position. This will be explained with reference to an example: If the workpiece is a hollow-cylindrical element such as a pipe end or a fitting, adjacent boundaries of the press jaws in the insertion position can be opened so far that the workpiece is formed in a "mouth" formed by the boundaries. can be inserted in the insertion position transversely to the longitudinal axis of the workpiece. On the other hand, the pliers can also move in the opposite direction away from the workpiece, so that manually a relative position between pressing tongs and workpiece must be maintained, for which the workpiece is arranged in the region of the pressing jaws and the die halves. By contrast, in the insertion position which is closed further in relation to the open position, the "mouth" formed by the boundaries of the die halves can be closed so far that the workpiece can no longer pass through the mouth transversely to the longitudinal axis of the workpiece. This means that in extreme cases, the pressing tongs could be released by the user at short notice, without the pressing tongs completely detaching from the workpiece. As a further advantage, the application range of the pressing tongs can be increased by a further open insertion position, that workpieces can be used with larger dimensions than for a pressing tongs, which has only the open position.

It is advantageous if, according to another pressing tongs according to the invention, the pressing jaws are acted upon in the insertion position by a spring element in the direction of the open position, so that the pressing jaws automatically return to the open position without the manual application of the pressing jaws to the insertion position.

The movement of the pressing jaws between the insertion position and the open position may be accompanied by a relative movement of the hand lever. However, if this relative movement of the hand lever is undesirable, a kind of play in the transmission mechanism between provide the hand levers and the pressing jaws, which can be used for the movement between the insertion and the open position, or a corresponding degree of freedom must be present or created. For this purpose, proposes a further solution according to the invention, that during a movement of the pressing jaws between the insertion position and the open position, the toggle joint is moved relative to the cam. In particular, the contour of the cam is oriented approximately in the direction of the axis of movement of the toggle joint in the area between the insertion and the open position, so that in the area the cam no stop or no exact limit for the toggle joint exists, but rather the toggle joint along the contour of Cam can slide (or can move away from it).

For a further proposal of the invention, the pressing tongs has a stop, which prevents an automatic closing movement of the pressing jaws, starting from the open position. In this case, an overcoming of the stop for manually bringing about a closing movement starting from the open position can take place in a variety of ways. For example, the stop can be moved, folded away or eliminated. According to a particular proposal of the invention, the stopper can be "bypassed" by bringing a counter-element, which comes into contact with the stop in the open position, out of engagement with the stopper with a first actuation of the hand lever.

Furthermore, it may be advantageous if a spring element is provided, which acts on the pressing jaws in the direction of the workpiece. In this case, the spring element can be articulated directly on at least one of the pressing jaws or act indirectly on the pressing jaws by the spring element acts on the power transmission mechanism. If an open position is secured by way of the previously explained stop or a corresponding latching device, the aforesaid spring can not be effective in the open position itself. However, if the stop or the locking device overcome, an "automatic gripping" of the workpiece can be done with the pressing jaws, so that the pressing tongs already occupies a predetermined position relative to the workpiece and then a one-handed operation is possible without another hand, the workpiece must hold.

While conventional pressing tongs of the type mentioned here usually have a total length of 60 to 90 mm, which may also be the case for the pressing tongs according to the invention, according to a variant of the pressing tongs according to the invention, this is shorter than 400 mm, in particular smaller than 350 mm or 300 mm. For such a short pressing tongs is a pressing of workpieces even in confined space conditions, for example within air conditioners for the creation of pipe connections or crimping from Fittingen possible.

According to another proposal of the invention are by means of crimping pliers, possibly even with a pressing pliers, which is smaller than 400 mm, especially smaller than 350 mm or 300 mm, pressing forces manually generated, which are greater than 20,000 N, for example, are greater than 25,000 N, 30,000 N, 40,000 N or 50,000 N or 60,000 N.

According to a preferred embodiment of the pressing tongs a Zwangsgesperre is provided in this. Under a Zwangsgesperre a locking device is understood, which allows a closing movement at least in a partial stroke of the pressing pliers, but once a pressing stage ensures such that position of the pressing jaws is also secured for elimination of the force applied by the user on the hand lever hand forces. Furthermore, a Zwangsgesperre ensures that the pressing tongs is not opened without a defined compression, so a defined end position of the pressing tongs is reached. Opening the pressing tongs before reaching the end position is possibly possible by pressing an emergency release. Examples of such Zwangsgesperre can the publications DE 101 40 270 B4 . DE 40 39 435 C1 . DE 198 07 737 C2 . DE 197 13 580 C2 . DE 198 34 859 C2 . DE 197 09 639 A1 and DE 199 24 086 C2 are removed, in which embodiments are disclosed in which the Zwangsgesperre with only one locking teeth and a single hereby cooperating, resiliently suspended and "foldable" locking element is formed.

It is also possible that the pressing tongs are equipped with a stop mechanism. A stop mechanism is understood here to mean a device by means of which the relative position between the hand levers can be changed without affecting the transmission mechanism and changing the position of the pressing jaws. About such a stop mechanism, a stroke of the pressing jaws can be divided into individual Teilhübe, for the Hand lever perform the same relative movement. An example of such a Gesatzgesperres is DE 103 46 241 B3 to be taken from the applicant.

Preferably, a pressing of the workpiece in the pressing tongs according to the invention takes place in more than 10, for example more than 15, in particular more than 20 pressing stages.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the introduction to the description are merely exemplary and can come into effect alternatively or cumulatively, without the advantages having to be achieved by embodiments according to the invention. Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer. The combination of features of different embodiments of the invention or of features of different claims is also possible deviating from the chosen relationships of the claims and is hereby stimulated. This also applies to those features which are shown in separate drawings or are mentioned in their description. These features can also be combined with features of different claims. Likewise, in the claims listed features for further embodiments of the invention can be omitted.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

zeigt Bauelemente einer erfindungsgemäßen Presszange in einer Draufsicht.

Fig. 2

zeigt die gesamte erfindungsgemäße Presszange gemäß Fig. 1 in einer Seitenansicht.

Fig. 3

zeigt Bauelemente der erfindungsgemäßen Presszange gemäß Fig. 1 und 2 in einer räumlichen Darstellung.

Fig. 4

zeigt Bauelemente der erfindungsgemäßen Presszange gemäß Fig. 1 bis 3 in einer Öffnungsstellung in einer Draufsicht.

Fig. 5

zeigt Bauelemente der erfindungsgemäßen Presszange gemäß Fig. 1 bis 4 in einer Schließstellung in einer Draufsicht.

Fig. 6

zeigt Bauelemente der erfindungsgemäßen Presszange gemäß Fig. 1 bis 5 in einer vergrößerten räumlichen Darstellung.

Fig. 7

eine Kurvenscheibe, wie diese in der erfindungsgemäßen Presszange gemäß Fig. 1 bis 6 Einsatz finden kann.

Fig. 8

zeigt einen Handhebel mit starr angebundener Tragplatte für eine erfindungsgemäße Presszange in einer Draufsicht.

In the following the invention will be further explained and described with reference to preferred embodiments shown in the figures.

Fig. 1

shows components of a pressing tongs according to the invention in a plan view.

Fig. 2

shows the entire pressing tongs according to the invention according to Fig. 1 in a side view.

Fig. 3

shows components of the pressing tongs according to the invention Fig. 1 and 2 in a spatial representation.

Fig. 4

shows components of the pressing tongs according to the invention Fig. 1 to 3 in an open position in a plan view.

Fig. 5

shows components of the pressing tongs according to the invention Fig. 1 to 4 in a closed position in a plan view.

Fig. 6

shows components of the pressing tongs according to the invention Fig. 1 to 5 in an enlarged spatial representation.

Fig. 7

a cam, as in the pressing tongs according to the invention Fig. 1 to 6 Can be used.

Fig. 8

shows a hand lever with rigidly connected support plate for a pressing tongs according to the invention in a plan view.

DESCRIPTION OF THE FIGURES

According to Fig. 1 a pressing tongs 1 according to the invention with two hand levers 2, 3 is formed. The hand lever 2 is rigidly connected to a support plate 4, against which further components of the pressing tongs 1 are firmly or rotatably supported. Rotatable relative to the support plate 4, an actuating unit 5 is mounted, in which in the order mentioned a pinion 6, a cam 7 and a pinion 8 are stacked and rigidly connected to a pivot pin 9, which is vertical to the plane according to Fig. 1 is oriented. The pivot pin 9 is rotatably supported about its longitudinal axis relative to the support plate 4, for example, in a through hole of the support plate 4 and in a through hole in a arranged on the opposite side corresponding support plate 10 which in Fig. 1 not shown.

Fig. 2 It can be seen that the pivot pin 9 protrudes on both outer sides of the support plates 4, 10. On one side of the support bolt is secured by a nut 11, while the pivot pin 9 is rigidly connected on the opposite side with an actuating element 12, here a thumbwheel. Between mother 11 and support plate 4 and / or actuator 12 and support plate 10, a nylon disc 13 may be braced, which can be influenced by the friction caused thereby and the contact force, as easily with Actuating element 12, pivot pin 9, pinion 6, 8, cam 7 and nut 11 formed actuator unit 5 can be rotated, for example, by manually rotating the actuator 12, and / or whether the actuator unit 5 can move back automatically from a once occupied position.

The hand lever 3 is also rigidly connected to a support plate 14 and has a through hole in the region of which the hand lever 3 with support plate 14 pivotally mounted relative to the pivot pin 9 and thus relative to the support plate 4 and the hand lever 2. Both the support plate 4 and the support plate 14 each have a rigidly received in a bore pin 15, 16, on which the bases of a tension spring 17 are supported. The pins 15, 16 are arranged such that the bias of the tension spring 17 has the consequence that the tension spring, the hand lever 2, 3 spread apart without applied by the user's hand forces while the hand lever with applied by the user forces under the action of the tension spring 17 can be pivoted towards each other.

In the transition region from the support plate 14 to the hand lever 3 carries the support plate 14 a vertically to the plane according to Fig. 4 pivotable locking lever 18. The locking lever 18 extends to the periphery of the associated pinion 8 and is pressed in the direction of the circumference of the pinion 8 via a Torsionsfederelement not shown in the figures. In the in Fig. 4 shown position, the locking lever 18 is oriented approximately tangentially to the pinion 8. For the illustrated embodiment, the locking lever 18 is rigidly connected to a pivot pin 19 which is rotatably mounted relative to the support plate 14. The pivot pin 19 has externally of the support plate 10 has an active surface 20, via which the pivot pin 19 with the locking lever 18 in Fig. 4 clockwise against the spring loading of the torsion spring is rotatable, so that the locking lever 18 can be pivoted away from the pinion 8 manually. For the in Fig. 4 illustrated embodiment, the active surface 20 is formed as a slot for a screwdriver. Without affecting the active surface 20 by the user, the locking lever 18 returns to the in Fig. 4 shown position back, in which the locking lever rests against the circumference of the pinion 8.

• In einer Rast- oder Sperrstellung tritt die Spitze oder Stirnseite des Rasthebels 18 in eine Zahnlücke der Rastverzahnung 21 ein. Für einen derartigen Eingriff sperrt der Rasthebel 18 eine Verdrehung des Ritzels 8 und damit der Betätigungseinheit 5 in eine Richtung.
• Hingegen wirkt die Spitze oder Stirnseite des Rasthebels 18 mit einer Verschwenkung des Handhebels 3 in Richtung des Handhebels 2 auf eine zugewandte Zahnflanke der Rastverzahnung 21 ein, so dass auf den Handhebel 3 aufgebrachte Betätigungskräfte des Benutzers über den Schwenkbolzen 19, eine Längskraft in dem Rasthebel 18 auf die Zahnflanke übertragen wird, was letztlich eine Verdrehung des Ritzels 8 und damit der Betätigungseinheit 5 entgegen dem Uhrzeigersinn zur Folge hat.
• Eine manuelle Verschwenkung des Handhebels 3 von dem Handhebel 2 weg oder eine derartige Verschwenkung durch die Beaufschlagung der Zugfeder 17 hat zur Folge, dass der Rasthebel im Uhrzeigersinn auf der Unterseite gemäß Fig. 4 entlang der Rastverzahnung 21 gleitet, einen Rastzahn oder mehrere Rastzähne überspringt und in einer anderen Zahnlücke der Rastverzahnung eine in die entgegengesetzte Drehrichtung gesicherte Stellung einnimmt.

The pinion 8 is provided at its periphery with a latching toothing 21, with which the end face of the latching lever 18 interacts as follows:

• In a latching or locking position, the tip or end face of the locking lever 18 enters a tooth gap of the latching toothing 21. For such engagement, the locking lever 18 locks a rotation of the pinion 8 and thus the operating unit 5 in one direction.
• By contrast, the tip or end face of the locking lever 18 acts with a pivoting of the hand lever 3 in the direction of the hand lever 2 on a facing tooth flank of the locking teeth 21, so that applied to the hand lever 3 operating forces of the user on the pivot pin 19, a longitudinal force in the locking lever 18th is transmitted to the tooth flank, which ultimately has a rotation of the pinion 8 and thus the actuator 5 counterclockwise result.
• A manual pivoting of the hand lever 3 of the hand lever 2 away or such pivoting by the application of the tension spring 17 has the consequence that the locking lever in the clockwise direction on the bottom according to Fig. 4 slides along the locking teeth 21, skips a locking tooth or a plurality of locking teeth and occupies a secured in the opposite direction of rotation in another tooth gap of the locking teeth.

Thus, by successive opening and closing of the hand lever 2, 3 in a plurality of partial strokes a rotation of the actuating unit 5 can be effected. A provision of the operating unit 5 together with the pivoting apart of the hand lever 2, 3 and the movement of the locking lever 18 in the clockwise direction is avoided by specifying the friction between the actuator unit and the support plates 4, 10, for example via the nylon disc thirteenth

Opposite the support plates 4, 10, a pivot pin 22 is mounted in suitable aligned bores, with which two pressing jaws 23, 24 are rotatable about a predetermined axis by the pivot pin 22, which is vertical to the plane according to Fig. 4 is oriented. The pressing jaws 23, 24 are to be roughly designated in plan view as a T-shaped, wherein formed with the pivot pin 22 pivot bearing 25 is disposed in the transverse leg end portion of the longitudinal leg of the T, wherein the end portions of the pressing jaws 23, 24 in the Swivel bearing 25 overlap. The outer end region of the transverse limb of the T of the pressing jaws 23, 24 each has an approximately semicircular receptacle 26, 27 for a die half to specify the to be pressed Contour of the workpiece. Die halves can each be received and locked in the receptacles 26, 27 and be unlocked or ejected in a conventional manner by actuation of two actuators 28, 29. With the outer boundaries 30, 31 is a kind of "mouth" 32 is formed, the opening width of which is variable with a closing movement of the pressing jaws 23, 24 and through which the workpiece in the receptacles 26, 27 and the die can be inserted or inserted.

In the limits 30, 31 opposite end portions of the transverse legs of the T of the pressing jaws 23, 24 these are pivotally connected via pivot bearings 33, 34 with end portions of toggle levers 35, 36. The toggle levers 35, 36 are hinged together in their opposite end regions via a toggle joint 37. For the illustrated embodiment, the pivot bearings 33, 34 and the toggle lever joint 37 with vertical to the plane according to Fig. 4 formed oriented bearing pin, which are guided in corresponding holes of the components involved.

A tension spring 38 is supported with a spring base with respect to the support plate 4, 10, while the other foot of the tension spring 38 is supported on a toggle lever 35, 36 or the toggle lever joint 37. The tension spring 38 is biased and oriented such that the tension spring acts on the toggle levers 35, 36 in the direction of its extended position, which means that the pressure jaws 23, 24 are acted upon in the direction of their closed position by the tension spring 38. Rotatable to the toggle joint 37, a roller 39 is mounted, which extends in the plane of the cam 7.

According to a contour 40 of the cam 7, on which the roller 39 can roll with a rotation of the actuator unit 5, the toggle lever joint 37 can be displaced, namely with an increase in the distance of the contour 40 of the pivot pin 9, a displacement of the toggle joint 37 on the Swivel pin 22 for the pressing jaws 23, 24 to be effected. For this purpose, the contour 40 of the cam disk 7 has a spiral-shaped pressing region 41, in which the distance of the contact region between the contour 40 and the roller 39 increases continuously with increasing rotation of the actuating unit 5. When the roller 39 reaches the end of the pressing region 41, the closed position 42 is reached. The contour 40 of the cam 7 does not interact with the roller 39 for a further rotation of the cam 7 in the remaining free area 43. If the actuating unit 5 is thus rotated beyond the closed position 42, it is not necessary for the actuator to rotate Cam 7 on the toggle joint 37 via the roller 39 exerted closing force. However, the force of the tension spring 38 continues to act in the closing direction. By manually opening the pressing jaws 23, 24, for example by acting on the actuating element 44, the pressing jaws 23, 24 can be opened. With increasing opening of the pressing jaws moves a pin 45, which is vertical to the plane according to Fig. 1 is oriented and rigidly received in a bore of an extension of the toggle lever 35, in the direction of a stop formed by an end face of the support plate 14 of the hand lever 3, which prevents closing of the pressing jaws due to the tension spring 38 in the open position. Pin 45 and stop 46 can be brought out of engagement for a renewed closing movement out of the open position by the hand lever 3 is pivoted in the direction of the hand lever 2. Conversely, the tension spring 38, if the stopper 46 is overcome, that the pressing jaws 23, 24 can close until they create themselves and under a predetermined by the tension spring 38 contact pressure to the lateral surface of a workpiece. Here, it is possible that the roller 39 is removed from the contour 40 of the cam 7, since the contact force in this case are not generated by contact forces of the contour 40 with the roller 39, but by the tension spring 38th

It should be noted that, unlike the illustrated connection between pin 45 and stop 46 any other locking or detent can be used, which can be manually operated and released separately by the user or according to the illustrated embodiment by a single operation of the hand lever 2, third

Starting from the in Fig. 1 shown closed position with the above-mentioned investment of the pin 45 on the stop 46, the pressing jaws 23, 24 can be opened manually by manually pulling apart the pressing jaws 23, 24, wherein the pin 45 is moved away from the stop 46 along a front guide surface 53rd During this movement from the open position into the insertion position, the free area 43 does not hinder movement of the toggle joint 37 away from the pivot pin 22.

For pressing a workpiece, the pressing tongs 1 are used as follows:

Starting from the in Fig. 1 shown opening position, the pressing jaws 23, 24 are first brought manually into the still open insertion position, so that the workpiece in the mouth 32 can be inserted. With a release of the pressing jaws 23, 24, the tension spring 38 closes the pressing jaws 23, 24 again in the open position according to Fig. 1 which is secured by pin 45 and stop. Of course, it is also possible that the workpiece without transferring the pressing tongs in the insertion position in the open position according to Fig. 1 in the receptacles 26, 27 and the press die halves is introduced. With a simple operation of the hand lever 2, 3, the pin 45 can be guided past the stop 46. This has the consequence that the tension spring 38 can pull the toggle joint 37 forward, whereby a movement of the pressing jaws 23, 24 is associated with each other, so that they clasp the workpiece. However, the described movement has the consequence that the roller 39 is slightly removed from the contour 40 of the cam 7. Following this, the cam disc 7 is rotated by manual rotation such that the roller 39 comes into contact with the contour 40 of the cam disc 7 in the pressing region 41. A partial stroke 49 of the pressing region 41 is thus brought about by manual rotation of the actuating unit 5. At the end of the manual rotation of the actuating unit 5, the reached position on the contour 40 is secured by the interaction of the pinion 8 with the locking lever 18. Now, a pressing or further pressing in a partial stroke 50 by successively pivoting the hand lever 2, 3 each other At the end of the pressing area 41, the closed position 42 is reached, whereby the pressing jaws 23, 24 are approached or closed to a maximum and completed the actual pressing process is. Further actuation of the hand lever causes a further rotation of the actuating unit beyond the closed position 42, so that in the free area 43, the actuating force exerted by the cam 7 on the toggle lever joint 37, deleted. Thus, the pressing jaws can slightly spring up due to an elastic expansion of the workpiece. However, despite the absence of contact between the cam disk 7 and the roller 39, the tension spring 38 continues to press the pressing jaws 23, 24 against the workpiece. For a removal of the pressing tongs 1 from the workpiece, the pressing jaws 23, 24 are manually pulled apart until the pin 45 is locked behind the stop 46, whereby the secured open position is reached. In the event that an opening of the pressing jaws 23, 24 beyond the open position is also required to remove the workpiece, a further pivoting of the pressing jaws 23, 24 apart from each other to the insertion position.

For the illustrated embodiment, a transmission mechanism 47 between the hand levers 2, 3 and the pressing jaws 23, 24 with the locking lever 18, the actuator unit 5 with pinion 8, cam 7, the toggle lever joint 37 and the toggle levers 35, 36 are formed. The transmission mechanism 47 serves to transmit forces and moments between hand levers 2, 3 and press jaws 23, 24, their translation and the influence of the closing kinematics.

For the illustrated embodiment, a pinion 8, a locking lever 18 and a tension spring 17 is disposed on both sides of the cam 7, whereby the forces acting on the locking teeth 21, the locking lever 18 and the tension spring 17 can be halved. On the other hand, a symmetrical power transmission in the transmission mechanism 47 can thereby be brought about.

As in particular in the Fig. 2 . 3 and 6 can be seen, essential components of the crimping pliers 1 are formed in plate construction.

With the actuating unit 5, which is manually actuated and acted on the toggle lever joint 37 and the toggle lever 35, 36 on the pressing jaws to produce a closing movement, a locking mechanism 48 is formed.

• über die manuelle Betätigung der Betätigungseinheit 5 und des Schließmechanismus 48 sowie
• über die Betätigung der Handhebel
  erfolgen. Für den Übergang vom Teilhub 49 zum Teilhub 50, also mit einem Beginn der Betätigung der Handhebel, ist eine Ausgangsstellung 51 eingenommen. Für einen anderen Pressvorgang kann der Teilhub 49' kürzer oder länger ausgebildet sein, so dass sich eine veränderte Ausgangsstellung 51' ergibt. Das Zusammenwirken zwischen Rasthebel 18 und Rastverzahnung 21 mit der Federbeaufschlagung durch die Zugfeder 17 bildet einen Ratschenmechanismus 52 oder Rastmechanismus oder Sperrmechanismus.

For example, via the closing mechanism 48 by manual actuation of the actuating unit 5, a movement of the pressing jaws 23, 24 towards each other in a partial stroke 49, while in a subsequent partial stroke 50, the actual pressing of the workpiece by pressing the hand lever 2, 3 takes place. For the illustrated embodiment can thus in partial areas of the closing stroke, the closing movement either

• on the manual operation of the actuator unit 5 and the locking mechanism 48 as well
• about the operation of the hand lever
  respectively. For the transition from partial stroke 49 to partial stroke 50, ie with a start of the operation of the hand lever, a starting position 51 is taken. For a different pressing operation, the partial stroke 49 'may be shorter or longer, so that a changed starting position 51' results. The interaction between locking lever 18 and Locking teeth 21 with the spring action by the tension spring 17 forms a ratchet mechanism 52 or locking mechanism or locking mechanism.

• DE 40 23 337 C1 , DE 44 27 553 C2 , DE 198 32 884 C1 und DE 100 56 900 C1 zeigen Zangen, bei denen Gesenkhälften translatorisch relativ zueinander bewegt werden, ggf. auch unter Führung in einem O-förmigen Rahmen.
• Verschwenkte Pressbacken für Kabelverbinder, bei denen eine Einführung des Werkstückes quer zur Zangenebene erfolgen kann, offenbart beispielsweise DE 37 08 727 C2 oder DE 199 24 087 C2 , während eine derartige Presszange für Fassungen, Rohre, Kabelschuhe beispielsweise DE 197 09 639 A1 entnommen werden kann. Auch DE 198 02 287 C1 offenbart eine Presszange, bei der Pressbacken verschwenkt werden.
• Presszangen mit einem C-förmigen Zangenkopf, bei dem Gesenkhälften zwischen den Querschenkeln des C verschieblich sind, sind DE 102 42 345 B3 oder DE 197 13 580 C2 zu entnehmen. DE197 53 436 C2 zeigt wahlweise den Einsatz eines derartigen C-förmigen Zangenkopfes oder eine Verschwenkung von Pressbacken.
• DE 40 26 332 C2 zeigt eine Presszange, bei welcher ein Werkstück stirnseitig in Richtung der Zangenebene in die Gesenkhälften eingeführt wird.
• Eine Integration eines Zwangsgesperres in unterschiedlich ausgebildete Presszangen ist den Druckschriften DE 101 40 270 B4 , DE 40 39 435 C1 , DE 198 07 737 C2 , DE 197 13 580 C2 , DE 198 34 859 C2 , DE 197 09 639 A1 , DE 199 24 086 C2 zu entnehmen.
• DE 198 32 884 C1 beschreibt eine Presszange mit einer Positionierhilfe (auch als "Locator" bezeichnet) für ein Werkstück relativ zum Zangenkopf.
• Eine Presszange mit einer veränderbaren Kinematik über eine Veränderung eines Anlenkpunktes einer Druckstange in einem Kniehebeltrieb ist aus DE 198 34 859 C2 bekannt.
• DE 199 63 097 C1 kann die Ausbildung eines Handhebels mit zwei Teilhebeln entnommen werden, deren relative Winkellage veränderbar ist zur Ermöglichung unterschiedlicher Öffnungsstellungen des Endbereichs Teilhebels, auf welches die Hand des Benutzers einwirkt, für gleiche Stellung der Pressbacken.
• Ein Nockentrieb für eine Schneidzange ist DE 101 32 413 C2 zu entnehmen.
• Ein Anschlaggesperre, welches auch in die vorliegende erfindungsgemäße Presszange integriert werden kann, ist DE 103 46 241 B3 zu entnehmen.
• Schließlich kann DE 10 2007 001 235 A1 eine Presszange mit drei oder zwei Handhebeln entnommen werden, welche einen umschaltbaren Übertragungsmechanismus besitzt, bei dem unter Umständen für zwei Teilhübe die Handhebel in unterschiedliche Richtungen relativ zueinander bewegt werden.

The illustrated embodiment of the crimping pliers is merely an exemplary embodiment. The features according to the invention described may be wholly or partly integrated in other crimping pliers, for example according to the patent applications and the patents of the applicant. For example, features of the invention can be used for the following pliers:

• DE 40 23 337 C1 . DE 44 27 553 C2 . DE 198 32 884 C1 and DE 100 56 900 C1 show pliers in which die halves are moved translationally relative to each other, possibly also under leadership in an O-shaped frame.
• Verschwenigte press jaws for cable connectors, where an introduction of the workpiece can be done transversely to the gun level, for example, disclosed DE 37 08 727 C2 or DE 199 24 087 C2 while such pressing tongs for sockets, pipes, cable lugs, for example DE 197 09 639 A1 can be removed. Also DE 198 02 287 C1 discloses a pressing tongs in which pressing jaws are pivoted.
• Crimping pliers with a C-shaped pliers head, in which die halves between the transverse legs of the C are displaceable, are DE 102 42 345 B3 or DE 197 13 580 C2 refer to. DE197 53 436 C2 shows either the use of such a C-shaped pliers head or a pivoting of pressing jaws.
• DE 40 26 332 C2 shows a pressing tongs, in which a workpiece is inserted into the front end in the direction of the pliers plane in the die halves.
• An integration of a Zwangsgesperres in different trained pressing tongs is the documents DE 101 40 270 B4 . DE 40 39 435 C1 . DE 198 07 737 C2 . DE 197 13 580 C2 . DE 198 34 859 C2 . DE 197 09 639 A1 . DE 199 24 086 C2 refer to.
• DE 198 32 884 C1 describes a pressing tongs with a positioning aid (also referred to as a "locator") for a workpiece relative to the pliers head.
• A pressing tongs with a variable kinematics on a change in a pivot point of a push rod in a toggle lever drive is off DE 198 34 859 C2 known.
• DE 199 63 097 C1 the formation of a hand lever can be removed with two partial levers whose relative angular position is variable to allow different opening positions of the end portion of the partial lever, which acts on the hand of the user, for the same position of the pressing jaws.
• A cam drive for a cutting pliers is DE 101 32 413 C2 refer to.
• An impact lock, which can also be integrated into the present pressing tongs according to the invention, is DE 103 46 241 B3 refer to.
• Finally, can DE 10 2007 001 235 A1 a pressing tongs are removed with three or two hand levers, which has a switchable transmission mechanism in which may be moved in different directions relative to each other for two partial strokes, the hand lever.

LIST OF REFERENCE NUMBERS

1

crimping pliers

2

hand lever

3

hand lever

4

support plate

5

operating unit

6

pinion

7

cam

8th

pinion

9

pivot pin

10

support plate

11

mother

12

actuator

13

Nylon wheel

14

support plate

15

pen

16

pen

17

mainspring

18

locking lever

19

pivot pin

20

effective area

21

locking teeth

22

pivot pin

23

pressing jaw

24

pressing jaw

25

pivot bearing

26

admission

27

admission

28

actuator

29

actuator

30

limitations

31

limit

32

mouth

33

pivot bearing

34

pivot bearing

35

toggle

36

toggle

37

Toggle joint

38

mainspring

39

role

40

contour

41

Press area

42

closed position

43

free area

44

actuator

45

pen

46

attack

47

transmission mechanism

48

closing mechanism

49

partial stroke

50

partial stroke

51

starting position

52

ratchet mechanism

53

guide surface

Claims (16)

Crimping tool (1) for manual pressing of a workpiece a) with two manually operable hand levers (2, 3), b) two pressing jaws (23, 24), between which the workpiece is pressed, c) a transmission mechanism (47) which couples a movement of the hand lever (2, 3) with a movement of the pressing jaws (23, 24),
characterized in that d) a closing mechanism (48) is provided, which is operable for in the pressing jaws (23, 24) inserted workpiece independently of the hand levers (2, 3), wherein e) with an actuation of the closing mechanism (48), the pressing jaws (23, 24) are movable from an open position to a partial stroke (49) into a further closed starting position (51), f) in the starting position (51) the pressing jaws (23, 24) are secured against a return to the open position and g) starting from the starting position (51) via a movement of the hand lever (2, 3), a further partial stroke (50) of the pressing jaws (23, 24) to each other to be brought about. Crimping pliers (1) according to claim 1, characterized in that on the locking mechanism (48) different starting positions (51, 51 ') can be brought. Crimping pliers (1) according to claim 2, characterized in that the closing mechanism (48) is formed with a ratchet mechanism (52). Crimping pliers (1) according to one of the preceding claims, characterized in that a) the transmission mechanism (47) is formed with toggle levers (35, 36) pivotably connected to one another in the region of a toggle lever joint, wherein at least one toggle lever (35, 36) in the end region facing away from the toggle joint (37) is provided with a pressing jaw (23 24) is articulated, b) a toggle joint (37) via a cam disc (7) is displaceable, whereby a closing movement of the pressing jaws (23, 24) can be brought about. Crimping pliers (1) according to claim 4 when appended to claim 3, characterized in that the cam disc (7) is coupled to the ratchet mechanism (52). Crimping pliers (1) according to claim 4 or 5, characterized in that the cam disc (7) rotatably connected to a on the outside of the pressing pliers (1) arranged adjusting element (12). Crimping pliers (1) according to one of the preceding claims, characterized in that the pressing jaws (23, 24) can be brought into an insertion position by manual relative movement of the pressing jaws (23, 24) starting from a stable open position in which the pressing jaws (23, 24 ) are opened further than in the open position. Crimping pliers (1) according to claim 7, characterized in that the pressing jaws (23, 24) are acted upon in the insertion position via a spring element (38) in the direction of the open position. Compressing pliers (1) according to claim 7 or 8 when appended to claim 4 or 5, characterized in that, during a movement of the pressing jaws (23, 24) between the insertion position and the open position, the toggle lever joint (37) moves relative to the cam disc (7) becomes. Crimping pliers (1) according to any one of the preceding claims, characterized in that a stop (46) or a latching device is provided which prevents or in the open position an automatic closing movement of the pressing jaws (23, 24). Crimping pliers (1) according to claim 10, characterized in that the stop (46) or the latching device can be overcome by operating the hand lever (2, 3). Crimping pliers (1) according to one of the preceding claims, characterized in that the spring element (38) and / or a spring element presses the pressing jaws (23, 24) against the lateral surface of the workpiece, preferably after the abutment (46) according to claim (10). or the locking device is overcome. Crimping pliers (1) according to one of the preceding claims, characterized in that the pressing pliers (1) has an overall length which is smaller than 400 mm, in particular smaller than 350 mm. Pressing tongs (1) according to one of the preceding claims, characterized in that by means of the pressing tongs (1) manually pressing forces can be brought about, which are greater than 20,000 N, for example, greater than 30,000 N. Crimping pliers (1) according to one of the preceding claims, characterized in that a Zwangsgesperre and / or a stop mechanism is / are provided. Crimping pliers (1) according to one of the preceding claims, characterized in that a pressing in more than 10, for example more than 15, in particular more than 20 pressing stages takes place.

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