EP2636489A2 - Pliers with actating lever - Google Patents

Abstract

The pliers i.e. water pump pliers (1), have forge-technical pliers arms (2, 3) rotatably connected with each other over a rotational axis (4). A saw tooth profile (16) is formed in an oblong hole (15). A locking part (19) is translatory moved in a release position in the hole and lockably arranged in a locking position by positive engagement in the profile. The locking part is held in the locking position by a spring force and moved from the lock position into the release position against the spring force by an actuating lever (18).

Description

The present invention relates to a pair of pliers, in particular a water pump pliers, according to the preamble of claim 1.

The present invention further relates to a pair of pliers, in particular a water pump pliers, according to the features in the preamble of claim 2.

Water pump pliers are known from the prior art, which are used in particular by installers in heating construction as well as in the installation of sanitary facilities or the laying of water pipes. A water pump pliers is characterized by the fact that it has two long gun arms, which allow a high gripping force with only one-handed operation due to the lever set between the jaws. So that the water pump pliers is versatile and for gripping nuts various size, for example, from nuts with a diameter for a 10ner mouth width up to a 28iger or even 32iger mouth width, are suitable and further different diameter of tubes can be taken with the water pump pliers, water pump pliers have an adjustment mechanism that allows the two gun arms to move so relatively translational that the jaws are variable in their distance from each other. Once the desired basic setting has been achieved, the two pliers arms, which are displaced relative to one another, are fixed in a rotationally fixed position via the adjusting mechanism, so that the pliers jaws are opened and closed by executing a pliers movement. After use, a water pump pliers is usually moved back to a starting position, so that the jaws bear substantially form-fitting manner to each other, so that an injury, such as a pinch, due to the accidental work movement, is avoided.

Commercially available water pump pliers are unlocked by a wide opening of the two forceps arms to each other, so that the translational movement is executable. For this purpose, in principle, two hands are necessary, which then allow a correspondingly wide divergence of the two gun arms and then a translational movement and a Aufeinanderzubewegen the forceps arms, which in turn are rotatably fixed to each other.

To improve handling, especially at low work area, is from the DE 33 03 369 A1 a water pump pliers, in which two pliers arms are inserted into one another, wherein in an inner pliers arm a slot is formed and the slot has a bordering tooth profile. The second tong arm is rotatably mounted about a locking piece, wherein the locking piece is translationally movable in the slot and can be transferred by an axial movement orthogonal to the slot direction in two different positions. Thus, a first position is taken over the locking piece, in which both gun arms positionally fixed in translation, but are rotatably mounted to each other.

If the locking piece is moved axially in a second position, a translational displacement of the locking piece is made possible within the slot. So that the locking piece is basically held in a locking position, a Pressure force exerted on the locking piece via a leaf spring. As a result, the adjustment improves, especially with limited available working space, for example when mounting in the space of several laid pipe strands. However, the handling, especially a one-handed operation for adjusting the water pump pliers, is only conditionally possible with high skill of the user installer.

Furthermore, the forceps in a between the jaws and the gun arms extending transition region is very solid, which is why it has top heavy weight due to the material of the gun arms in the transition region and the locking piece. Due to the high strength of the pliers, the head load is located at the opposite end of the pliers, where it is gripped by the applying fitter, the pliers here has a high inertia and it takes at hours for many applications of high handling forces to the pliers several hundred or even move several thousand times on a working day to different tool-application positions.

The object of the present invention is, starting from the prior art, to improve a pair of pliers, in particular a water pump pliers, in such a way that it is easier to handle with favorable manufacturability and furthermore to provide increased strength. It is a further object of the present invention to improve the handling of the pliers.

The above object is achieved with a pair of pliers, in particular a water pump pliers, according to the features in claim 1.

The object is further achieved with a pair of pliers, in particular with a water pump pliers, according to the features in claim 2.

Advantageous embodiments of the present invention are part of the dependent claims.

The pliers according to the invention, in particular water pump pliers, has a first pliers arm and a second pliers arm, wherein the pliers arms are rotatably connected to each other via a pivot axis. A pliers arm points a slot on, wherein in the slot a sawtooth profile is formed, and the other tong arm is rotatably formed about a slot arranged in the locking piece, wherein the locking piece is in a release position in the slot in particular translationally displaceable and in a locked position by positive engagement in the Saw tooth profile is arranged lockable and the locking piece is held in the blocking position by a spring force. The task of simplifying the handling of the forceps is achieved in that the locking piece against the spring force via an actuating lever from the blocking position into the release position can be transferred. By adjusting the locking piece, a quick adjustment of the pliers is possible, without first consuming to move back both pliers arms, make an adjustment and then move again both pliers arms toward each other. Furthermore, a secure intervention in the teeth is always guaranteed by the self-closing of the locking piece.

In the context of the invention, the locking piece can be moved translationally in the slot, which is considered a preferred embodiment. Furthermore, however, the slot itself may also be curved, for example, the slot has an arcuate course. The locking piece is then displaceable within the slot following the arcuate course. The slot can thus follow in a pliers arm whose course, which may also be curved. As an advantage then the edges of the slot would be formed with substantially constant thickness, since both slot in this case, as well as pliers have a same course.

In the context of the invention, the sawtooth profile arranged in the oblong hole can be any kind of profiling which can be brought into engagement in a form-fitting manner in a limited number of positions. Thus, the sawtooth may be formed, for example, triangular or pyramidally shaped saw teeth in cross section, but it may also be formed a wave profile or a profile with a different geometric shape, the geometric shape with the locking piece positively fixed in a limited number of different positions can be brought to the intervention.

In the context of the invention, the individual teeth or else indentations of the profile can be arranged directly adjacent to one another or else at a distance from one another, so that, for example, only two or three different position-fixed positions relative to one another are made possible. In the context of the invention, however, it may also be directly adjacent teeth that allow, for example, 10 or even 20 different locking positions by the translational movement of the two forceps arms to each other.

The actuating lever is a lever which is pivotally mounted on the pliers, in particular on a pliers arm, and is coupled with one side in a form-fitting manner with the locking piece and on which this opposite side is manually operable. Preferably, the actuating lever is pressed by a thumb of an applying mechanic in the direction of the forceps itself, being transferred by the lever movement, the locking piece of the blocking position in the release position. Following this, it is possible to move the two forceps arms, for example, by engaging one another with one palm and the four remaining fingers and a displacement of the fingers and palm to each other.

Due to the lever law of the actuating lever only small forces are needed, which are needed to overcome the spring force and thus to unlock the locking piece. It does not have to be pressed directly on the locking piece, but a user-friendly and at the same time power-saving operation is achieved via the lever. At the same time, however, it is ensured that a sufficient bias is ensured by the voltage applied to the locking piece in the locking position spring force, so that a reliable operation of the pliers is possible.

Preferably, the actuating lever is mounted about a pivot pin in a gun arm and surrounds the locking piece on the head side. In particular, the locking piece for this purpose has a lens head, which is very particularly preferably formed integrally on the locking piece and is under attack either by a clevis of the actuating lever or is engaged behind a form-fitting manner in a receiving opening of the actuating lever. When actuated lead Locking piece and actuating lever from a relative movement to each other, so that a simple movement of the locking piece from the blocking position to the release position and from the release position is again made possible in the locked position, without the locking piece tilted into the gun arms.

The aforementioned object is further achieved by a pair of pliers, in particular a water pump pliers, the pliers having a first pliers arm and a second pliers arm and the two pliers arms are rotatably connected via a pivot axis, each pliers arm a handle portion, a head portion, arranged on the head portion Baking and extending between the head portion and the handle portion transition portion and the forceps arms are translationally mutually displaced, whereby an opening width of the jaws is variable and the forceps in particular also has the features described above, achieved in that at least one gun arm in the head portion has a framework structure, wherein the truss structure is power flow optimized and / or that the jaws have a gripping area and a tip, wherein the executable by the forceps arms rotational movement of the forceps arms is so limited, that with completely closed pliers, the distance of the tips of the jaws is always smaller than the distance of the jaws in the gripping area.

In the context of the invention, a truss structure is to be understood as meaning a structure which is formed from trusses arranged in a truss-like manner and interspaces arranged within the struts. The struts are opposite to the intermediate spaces, wherein the orientation of the struts are selected depending on the expected force flows. This makes it possible to optimize the forceps, in particular in the head-side region or in the extending from the head portion to the handle portion transition section in their weight, while maintaining at least the same strength. This results in a much easier handling, so that the limbs of the arm of the user installer are spared because he has to spend much lower forces to pivot the pliers in the respective working position.

Furthermore, the pliers is to produce much cheaper through material savings, especially in this area. The high strength properties, wherein the strength properties are at least the same, if not higher, despite material savings than conventionally made water pump pliers, are achieved by a forge technology production of the gun arms.

Another advantage of the water pump pliers according to the invention is that the objects to be brought into the gripping area between the jaws due to the distance between the tips of the jaws to each other with fully closed pliers are always good to grab with a hand movement of the pliers in the grip portions of the gun arms. Due to the smaller distance between the tips of the jaws to each other with fully closed pliers against the distance of the jaws to each other in the gripping area is prevented that a gripped object, such as a large tube, slip out of the gripping area with a pipe outside diameter.

In the context of the invention, the actuating lever is particularly preferably formed on a tong arm in such a way that it extends at least in sections into the grip section from a transition section, which is located between a head section and a grip section on a tong arm. The actuating lever is thus formed as an elongate member and engages with its one end the locking piece, which is located in the head-side region of the transition section, wherein the opposite sides of the transitional portion extends at least partially into the handle portion, so that they are in proper and labor-safe gripping the Water pump pliers in the handle section is actuated. In particular, the operation is done with a thumb or index finger, so a finger, which is oriented in normal handling of the water pump pliers in the direction of the pliers head. Thus, it is possible to leave the pliers with a hand movement in the work area and yet particularly easy and uncomplicated to adjust in size.

So that the operating lever can transmit the force applied by a finger leverage on the locking piece, the actuating lever is particularly preferred over a deflecting point pivotally mounted on a gun arm, wherein the deflection point is formed in particular as a cross pin. It is possible to mount the actuating lever to the gun arm and then bring the cross bolt and secure in the gun arm, in particular to rivet. Thus, even with intensive daily use of the water pump pliers, the operating lever is properly located therein and failure of the actuating mechanism is avoided. The riveting is particularly preferred to the integrally formed locking piece. In the context of the invention, however, it is also possible to fix the cross pin differently. This can be done positively and / or non-positively and / or materially. It is particularly important that the cross bolt is captively fixed in the gun arm.

In the context of the invention, the force acting on the locking piece spring force is exerted in particular on the actuating lever on the locking piece. For this purpose, a spring is particularly preferably arranged between an actuating portion of the actuating lever and a pliers arm coupled to the actuating lever, in particular a helical compression spring or else a leaf spring. This allows the spring to be located away from the locking piece. A arranged in the region of the locking piece spring often leads due to the movement and abrasive wear in this area to failure in other known water pump pliers with locking mechanism. A leaf spring, which is riveted to a gun arm and has a biasing force acting directly on the locking piece, subject in years of intensive use of such a water pump pliers in the professional field of wear due to relaxation of the spring force and is also in principle the risk of mechanical damage due to external influence exposed. By displacing the spring from the region of the adjusting and locking mechanism in a non-critical area on the gun arm these points are avoided. In particular, a helical compression spring is suitable here because of their spring properties, as they do not lose their resilience in their spring force, even with years of intensive and daily use.

Furthermore, the actuating lever is particularly preferably designed with a fork head, wherein the fork head engages around the locking piece in a relatively movable manner. In an alternative embodiment, the actuating lever is formed with an eccentric receiving opening, wherein the receiving opening is relatively movable coupled to the locking piece. In particular, the receiving opening is locked in a bayonet with the locking piece and the operating lever is mounted on the pliers.

Further preferably, the locking piece is formed with a lens head, wherein in the invention, in particular the lens head is integrally formed on the locking piece. This makes it possible to uncritically absorb the tensile forces generated during the actuation of the locking piece. Compared with the formation of the locking piece with a rivet here during use always the risk of a component failure, which is avoided due to the integral nature of the locking head according to the invention. In particular, in interaction with the clevis or with the receiving opening, it is thus possible to relatively positively couple the locking piece and the actuating lever with each other.

Further particularly preferably, the actuating lever in the coupling region with the locking piece on a curved receiving surface for engaging behind the lens head, wherein the curvature of the gun arms pointing away is oriented. Due to the curvature, it is possible during the entire pivoting movement of the actuating lever to produce such a positive engagement or engagement of the actuating lever from the lens head, so that the locking piece does not tilt. The curvature is preferably formed on the lens head in such a way that a normal which is in each case standing on the curvature engages orthogonally under the lens head in the respective position. Thus, a perfect axial movement of the lens head is possible.

Further preferably, the first gun arm is provided in its transition portion with a longitudinal slot, wherein the second gun arm engages the longitudinal slot with its transition portion and the second tong arm has the slot with the sawtooth and in the second gun arm, the locking piece is translationally movable in the release position and in the blocking position is fixed in position, wherein the locking piece is further mounted axially displaceable in the first gun arm, so that by the axial displacement, the locking position or release position is receivable and the first gun arm is rotatably mounted around the locking piece. This makes it possible that when fixing the position of the locking piece within the sawtooth profile by the rotatable mounting of the first gun arm, the forceps movement or gripping movement is executable.

By taking the release position of the locking piece, it is possible to move the locking piece within the slot of the second gun arm, wherein the two gun arms are held fixed in position by the longitudinal slot and the longitudinal slot cross-second tong arm in the axial direction of movement of the locking piece. This makes it possible according to the invention that the water pump pliers is limited to a minimum of the components to be used, since no additional bearings, spring elements or other rivets, snap rings o. Ä. Are used in the coupling area. In particular, the coupling region is formed exclusively by first and second gun arm and the two tong arms rotatably coupling locking piece. For actuating the locking piece then the actuating lever according to the invention is also provided. Other components, such as snap rings, springs o. Ä. Are avoided in the coupling area.

Furthermore, the first tong arm is particularly preferably designed in such a way that at least one receptacle for the actuation lever is provided on an upper side and guide holes are arranged on an underside and on the upper side, wherein the locking part passes through the first tong arm axially displaceably and rotatably in the guide holes. Thus, the locking piece is slidable in the guide holes in its axial direction to occupy the locking position and the release position and can also be used in the initial assembly in the pliers. Further, the first gun arm is then rotatably disposed about the locking piece, so that by the rotational movement, the forceps movement is executable. Preferably then the actuating lever also rotates with the rotational movement of the first gun arm around the locking piece with. Thus is also the Operating lever in the region of the fork head or the receiving opening rotatably disposed about the locking piece.

Further, the actuating lever has an extension on an actuating side, wherein the extension is formed projecting into the receptacle of the top of the first gun arm and in the release position, ie upon actuation of the actuating lever, comes to rest on the underside of the first gun arm limiting. This gives the possibility to limit this in its pivoting movement when handling the operating lever. Furthermore, it requires due to the positive coupling of the actuating lever with the locking piece thus no further blocking or limiting means on the locking piece itself. The locking piece is thus limited by the operating lever form-fitting in its axial displacement in locking position and release position. Circlip constructions or other position fixings on the locking piece thereby completely eliminated.

Further preferably, a helical compression spring is arranged on the extension, whereby then a simple and at the same time effective and durable kinematic coupling of the adjusting mechanism and the rotational movement to perform the forceps movement is given.

Furthermore, particularly preferably, the guide hole is formed circular on the underside. In particular, the locking piece is also formed on its underside also circular, wherein it particularly preferably has a circular section. This makes it possible, at least on one side of the pliers, to allow a positive connection between circular guide hole and circular section, which ensures the highest possible load when performing the pliers movement. Further preferably, teeth are arranged in a central region of the locking piece, wherein the teeth are formed corresponding to the sawtooth profile. In the case of juxtaposed, directly adjacent, triangular profiles of the sawtooth profile according to the teeth on the locking piece are also triangular, formed directly adjacent. Further preferably, the locking piece is formed such that it has a central region, wherein in the central region two parallel walls are arranged and the teeth project from the walls, wherein the walls have a distance from each other, that of the tips of the sawtooth profile of the elongated hole corresponds, so that in the release position, a positive sliding within the slot is made possible, wherein in the locking position, the teeth with the sawtooth profile in a form-locking fixed position can be brought into engagement. Due to the two parallel running walls, it is thus possible that the walls between the tips of the sawtooth profile of the slot are arranged and thus allow on the one hand in the locked position a positional fixation due to the opposite walls protruding teeth and on the other in the release position, a sliding over the Allow peaks of the sawtooth profile.

Further preferably, the length of the walls is formed corresponding to at least the distance between two peaks of the sawtooth profile. This ensures that when taking the release position and translational movement, the locking piece is not tilted within the two opposite sawtooth profiles of the slot, but is guided in the direction of the translational degree of freedom such that the locking piece is always moved in parallel within the slot.

In particular, the pliers arms are made by forging, resulting in the highest strength properties at the same weight saving potential. By constructive minimization of the required components according to the invention thus the pliers arms can thus be formed directly and are rotatably engaged with each other via the locking piece, without additional bearings o. Ä. Are required. In the context of the invention, the pliers arms are in particular made of a steel material, wherein the locking piece is very particularly preferably formed of a steel material. The actuating lever may also be formed in the context of the invention of a steel material, but also of a light metal or of a plastic material. Furthermore, particularly preferably, the forceps arms in the handle portion on a truss and / or at least in sections, a strut is formed in the handle portion. By trained in the handle portion framework, it is possible to further reduce the specific weight of the water pump pliers according to the invention with constant strength properties, especially in the strongly influenced by the grip force grip portion. Furthermore, given by the at least partially circumferential strut the possibility to increase the stiffness in the handle portion and at the same time to make the available area for applying the manual force to the water pump pliers so large that the gripping surfaces do not cut into the hands of an applying mechanic, but sufficient gripping surface for applying the hand force is present.

Within the scope of the invention, the abovementioned features can be combined as desired with one another with the associated advantages, without leaving their frames.

Figur 1

eine erfindungsgemäße Wasserpumpenzange in geöffneter Stellung;

Figur 2

eine erfindungsgemäße Wasserpumpenzange in geschlossener Stellung;

Figur 3 und 4

einen Querschnitt durch die Wasserpumpenzange entlang der Schnittlinie A-A;

Figur 5 und 6

einen Querschnitt durch die Wasserpumpenzange gemäß Schnittlinie B-B;

Figur 7 und 8

einen erfindungsgemäßen Betätigungshebel in Seitenansicht und Draufsicht;

Figur 9

den erfindungsgemäßen Betätigungshebel mit Sperrstück in einer perspektivischen Ansicht;

Figur 10 und 11

eine zweite Ausführungsvariante der erfindungsgemäßen Wasserpumpenzange mit Betätigungshebel mit Gabelkopf;

Figur 12

einen Betätigungshebel gemäß der Ausführungsvarianten von Figur 10 und Figur 11 und

Figur 13

eine erfindungsgemäße Wasserpumpenzange mit erfolgter axialer Aufweitung in geschlossenem Zustand.

Further advantages, features, characteristics and aspects of the present invention are part of the following description. Preferred embodiments are shown in the schematic figures. Show it:

FIG. 1

a water pump pliers according to the invention in the open position;

FIG. 2

a water pump pliers according to the invention in the closed position;

FIGS. 3 and 4

a cross section through the water pump pliers along the section line AA;

FIGS. 5 and 6

a cross section through the water pump pliers according to section line BB;

FIGS. 7 and 8

an operating lever according to the invention in side view and top view;

FIG. 9

the actuating lever with locking piece according to the invention in a perspective view;

FIGS. 10 and 11

a second embodiment of the invention Wasserpumpenzange with operating lever with clevis;

FIG. 12

an actuating lever according to the embodiments of FIG. 10 and FIG. 11 and

FIG. 13

a water pump pliers invention with completed axial expansion in the closed state.

In the figures, the same reference numerals are used for the same or similar components, even if a repeated description is omitted for reasons of simplicity.

FIG. 1 shows a water pump pliers 1 according to the invention, which has a first gun arm 2 and a second gun arm 3, wherein the two gun arms 2, 3 are rotatably coupled to each other about a rotation axis 4. Furthermore, the water pump pliers 1 according to the invention has a closure mechanism which makes it possible to carry out a translatory adjustment movement 5 between the first 2 and second 3 pliers arm, whereby the opening width 6 of the water pump pliers 1 can be adjusted. Furthermore, each pliers arm 2, 3 a handle portion 7, 8, a head portion 9, 10 and arranged on the head portion 9, 10 jaws 11, 12 and between the head portion 9, 10 and handle portion 7, 8 extending transition portion 13, 14.

To execute the translational adjustment movement 5, a slot 15 is arranged in the transition section 13, 14 of the second gun arm 3, the slot 15 each having a sawtooth profile 16 at its outer edges. Furthermore, both pliers arms 2, 3 in the handle portion 7, 8 each have an outside at least partially outer circumferential strut 17 which increases in the grip portion 7, 8, the support surface for the hand of an applying mechanic.

According to the invention, an actuating lever 18 is arranged on the water pump pliers 1, which, when actuated, displaces a locking piece 19 in the axial direction, so that it is moved from a blocking position into a release position and executes the translatory adjusting movement 5. If the locking piece 19 is arranged in the blocking position, the two gun arms 2, 3 are rotatably mounted about the axis of rotation 4.

Furthermore, the water pump pliers 1 according to the invention in the head section 9, 10, a framework 20, wherein the framework 20 is formed of recesses 21 and between the wells 21 mounted struts 22. As a result, it is possible to save material and weight precisely in the head region of the forceps arms 2, 3, which is why the water pump forceps 1 can be produced significantly more favorably with at least constant strength and have a lower dead weight.

FIG. 2 shows the water pump pliers 1 in an initial position, wherein the translational movement 5 is carried out such that the water pump pliers 1 has the smallest possible opening width. Shown is a section line AA, which in FIG. 3 and FIG. 4 is explained in more detail.

FIG. 3 shows the water pump pliers 1 FIG. 2 in the starting position. The locking piece 19 is arranged in the blocking position. By actuating the actuating lever 18, it is possible to displace the locking piece 19 in the axial direction 23, so that the locking piece 19 in FIG. 4 represented a release position occupies. In the release position teeth not shown here are brought out of the positive engagement of the sawtooth, so that a translational displacement movement 5 is made possible within the elongated hole 15 between the first gun arm 2 and second gun arm 3.

So that the forceps arms 2, 3 remain positively positioned relative to one another in the axial direction 23, the first forceps arm 2 has a longitudinal slot 24 in its transitional portion 13, wherein the second forceps arm 3 engages through the longitudinal slot 24 of the first forceps arm 2 in a form-fitting manner. The operating lever 18 is moved by actuation in the release position. For this purpose, the actuating lever 18 has been pivoted about a deflection point 25. So that the locking piece 19 is not off the first 2 and second 3 tong arm falls out, the actuating lever 18 is arranged retractable in a receptacle 26 within the first gun arm 2, wherein the locking piece 19 is fixed in position by means of guide holes 27 axially movable positively. The guide holes 27 are shown here formed only on an underside 28 of the gun arm 2, but also in the second gun arm 3 and also in a top 29 of the first gun arm 2 is formed.

The actuating lever 18 has an extension 30, wherein the extension 30 comes to the underside 28 of the first gun arm 2 in the release position positively to the plant and thus limits the pivotal movement of the actuating lever 18 to the deflection point 25. Further, the actuating lever 18 engages under the locking piece 19 on a lens head 31, so that by actuation of the actuating lever 18, the locking piece 19 performs an axial movement. Further shown in FIG FIG. 3 and FIG. 4 the respective circumferential struts 17 in the handle portion 7 of the first gun arm second

Continue to show FIG. 5 and FIG. 6 a cross section along section line BB FIG. 2 , In FIG. 5 is the locking piece 19 in the locked position, whereas in FIG. 6 the locking piece 19 is moved by actuation of the actuating lever 18 in a release position. In FIG. 6 shown is the sawtooth 16 of the elongated hole 15, wherein the locking piece 19 has teeth 32 which in FIG. 5 are positively engaged with the sawtooth 16 in engagement.

Furthermore, in FIG. 3 and FIG. 4 can be seen that the actuating lever 18 is recessed or aligned approximately within the top 29 of the first gun arm 2, so that there is no risk of injury due to unnecessary snagging on the operating lever 18 results. Furthermore, the actuating lever 18 is thus protected against mechanical damage and at the same time therefore offer no points of attack for contamination, which is why even with intensive use an aesthetic overall impression of the water pump pliers 1 according to the invention remains.

Further illustrated is the operating lever 18 in FIG. 7 in a side view. Good to see the extension 30 and a mounting hole 33 for performing a not shown pivot pin to allow the deflection point. Furthermore, the actuating lever 18 on an actuating side 34. On the side opposite the actuating side 34, the actuating lever 18 also has a receiving side 35, wherein in the receiving side 35, shown in FIG FIG. 8 , A receiving opening 36 is arranged, which serves for the positive coupling with the locking piece not shown here. Furthermore, it can be seen that a curved receiving surface 37 is arranged on the receiving side 35, so that upon actuation a surface normal N shown in each case engages below the locking piece (not illustrated here) at its lens head substantially orthogonally.

Furthermore shown in FIG. 9 in that a helical compression spring 38 is arranged on the actuating side 34 of the actuating lever 18. The helical compression spring 38 then comes in accordance FIGS. 3 and 4 between the extension 30 of the actuating lever 18 and the bottom 28 of the first gun arm 2 form fit to the plant and exerts a spring force on the actuating lever 18 on the locking piece 19. Also shown is the locking piece 19 with the lens head 31 in positive engagement with the receiving opening 36 of the actuating lever 18. Here, for example, it is conceivable that the locking piece 19 is locked in a bayonet-like manner in the receiving opening 36. Further, the locking piece 19 has teeth 32, which are then positively inserted with the not shown sawtooth profile of the slot of the second gun arm.

FIG. 10, 11 and 12 show a further embodiment of the present invention Wasserpumpenzange 1, wherein in turn in a head portion 9, 10, a framework 20 with recesses 21 and struts 22 is formed. The actuating lever 18 itself has a fork head 39 which engages behind the lens head 31 of the locking piece 19 in a form-fitting manner. This makes it possible to form the locking piece 19 such that it according to FIG. 11 on a bottom 28 has a circular section 40. According to FIG. 12 the positive engagement between actuating lever 18 and locking piece 19 is shown in more detail due to the clevis 39. The clevis 39 engages behind the one-piece formed on the locking piece 19 Linsenkopf 31 positive fit. Furthermore, the clevis 39 has guide slots 41, which engage behind the lens head 31 in a form-fitting manner and guide it fixed in position. Furthermore, a circular portion 40 is formed on a bottom 42, which then engages positively in a guide hole of the first gun arm and thus can transmit high forces to carry out the forceps movement here.

Further, the locking piece 19 has a lateral surface 43, which then transmits forces in the locking position, in particular within the guide hole at the top of the first gun arm. Furthermore, the teeth 32 are arranged on the locking piece 19, which are in the locking position positively engageable with the sawtooth engaged. Furthermore, the locking piece 19 has two parallel walls 44, wherein the teeth 32 are arranged on the walls 44 and the walls 44, the locking piece 19 in the release position and in the blocking position form fit through the slot between the tips of the sawtooth profile.

FIG. 13 shows the water pump pliers 1 according to the invention in a representation in which the two gun arms 2, 3 are moved towards each other. This results between the jaws 11, 12 such an angle, so that the distance a1 between the tips 45 of the jaws 11, 12 is always smaller than a distance parallel thereto a2 and a3, in the gripping region 46 between the jaws 11, 12th given is. This avoids that a gripped object from the jaws of the gun arm 2, 3 slips out.

Reference numerals:

1 - Wasserpumpenzange 2 - first forceps arm 3 - second pliers arm 4 - axis of rotation 5 - translational movement 6 - opening width 7 - Handle section to 2 8th - Handle section to 3 9 - Head section to 2 10 - Head section to 3 11 - Pliers jaw to 2 12 - Pliers jaw to 3 13 - Transitional section to 2 14 - Transitional section to 3 15 - Long hole 16 - sawtooth 17 - strut 18 - actuating lever 19 - locking piece 20 - truss 21 - deepening 22 - strut 23 - axial direction to 19 24 - Longitudinal slot two 25 - turning point 26 - admission 27 - hole 28 - Bottom to 2 29 - Top to 2 30 - extension 31 - Pan head 32 - Tooth to 19 33 - mounting hole 34 - actuating side 35 - Up side 36 - receiving opening 37 - curved receiving surface 38 - Helical compression spring 39 - clevis 40 - circular section 41 - guide slot 42 - Bottom to 19 43 - lateral surface 44 - wall 45 - top 46 - Griffin area N - surface normal

Claims (18)

Pliers, in particular water pump pliers (1), comprising a first tong arm (2) and a second tong arm (3) which are rotatably connected to each other via a pivot axis (4), wherein a tong arm (2, 3) has a slot (15) with a in the slot (15) formed sawtooth profile (16) and the other tong arm (2, 3) is rotatably formed about a locking piece arranged therein (19), wherein the locking piece (19) in a release position in the slot (15), in particular translationally displaceable and lockable in a blocking position by positive engagement in the sawtooth profile (16), wherein the locking piece (19) is held in the locking position by a spring force, characterized in that the locking piece (19) against the spring force via an actuating lever ( 18) from the locking position into the release position can be transferred. Pliers, in particular water pump pliers (1), comprising a first tong arm (2) and a second tong arm (3) rotatably connected to each other via a pivot axis, each arm (2, 3) having a handle portion (7, 8), a head portion (9, 10), jaws arranged on the head section (9, 10) and a transition section (13, 14) extending between the head section (9, 10) and the grip section (7, 8), and the tong arms (2, 3 whereby an opening width (6) of the jaws (11, 12) is changeable, in particular according to claim 1, characterized in that at least one tong arm (2, 3) in the head section (9, 10) has a framework structure ( 20), wherein the truss structure (20) is power flow optimized and / or that the jaws have a gripping area and a tip, wherein by the forceps arms (2, 3) executable rotational movement of the gun arms (2, 3) is limited so that at vol When the forceps are closed, the distance (a1) of the tips (45) of the jaws (11, 12) is smaller than the distance (a2, a3) of the jaws (11, 12) in the gripping area (46). Tongs according to claim 1 or 2, characterized in that the actuating lever (18) extends from a transition section which is located between a head section (9, 10) and a grip section (7, 8) on a tong arm (2, 3), at least sections in the handle portion (7, 8) extends. Pliers according to one of claims 1 to 3, characterized in that the actuating lever (18) via a deflection point (25) is pivotally mounted, in particular, the deflection point (25) is designed as a transverse bolt. Pliers according to one of claims 1 to 4, characterized in that the spring force of the locking piece (19) via the actuating lever (18) on the locking piece (19) is exercised, in particular between an actuating portion and the actuating lever (18) coupled to the gun arm (2, 3) arranged a spring, preferably a helical compression spring or a leaf spring. Pliers according to one of claims 1 to 5, characterized in that the actuating lever (18) has a fork head (39), wherein the fork head (39) engages around the locking piece (19) in a relatively movable manner or in that the actuating lever (18) has an eccentric receiving opening (36 ), wherein the receiving opening (36) is relatively movable coupled to the locking piece (19). Pliers according to claim 6, characterized in that the locking piece (19) has an integrally formed lens head (31), wherein the lens head (31) of the clevis (39) or the receiving opening (36) is engaged behind a positive fit. Pliers according to one of claims 1 to 7, characterized in that on the actuating lever (18) has a curved receiving surface (37) for engaging behind the lens head (31) is formed, wherein the curvature of the gun arms (2, 3) is oriented pointing away. Pliers according to one of claims 1 to 8, characterized in that the first pliers arm (2) has a longitudinal slot (23) in its transition section (13), the second pliers arm (3) with its transition section (14) forming the longitudinal slot (24). engages, wherein the second tong arm (3) has the slot (15) with the sawtooth profile (16) and in the first gun arm (2) the locking piece (19) is axially displaceably mounted and the first gun arm (2) to the locking piece (19 ) is rotatably mounted. Pliers according to one of Claims 1 to 9, characterized in that the first tong arm (2) has at least one receptacle (26) for the actuating lever (18) on an upper side (29) and on the upper side (29) and on a lower side (29). 28) has guide holes (27), wherein the locking piece (19) in the guide holes (27) is arranged axially displaceably and rotatably. Pliers according to claim 10, characterized in that the actuating lever (18) on an actuating side (34) has an extension (30), wherein the extension (30) projects into the receptacle (26) of the upper side (29) and in a release position the bottom (28) comes to rest. Pliers according to claim 11, characterized in that a helical compression spring (38) is arranged on the extension (30). Pliers according to one of claims 10 to 12, characterized in that the guide hole (27) on the underside (28) is circular. Pliers according to one of claims 1 to 13, characterized in that the locking piece (19) on a lower side (28) has a circular portion (40) and in a central region teeth (32) are arranged, wherein the teeth (32) corresponding are formed to the sawtooth profile (16). Pliers according to one of claims 1 to 14, characterized in that the locking piece (19) has a central region, wherein in the central region two parallel walls (44) are arranged and the teeth (32) protrude from the walls (44), the walls (44) being at a distance to each other, which corresponds to that of the tips of the sawtooth profile (16) of the elongated hole (15), so that in the release position, a positive sliding within the elongated hole (15) is made possible, wherein in the locking position, the teeth (32) with the sawtooth profile (16 ) are positively fixed in position fixable engageable. Pliers according to claim 15, characterized in that the length of the walls (44) corresponds at least to the distance between two points of the sawtooth profile (16). Pliers according to one of claims 1 to 16, characterized in that the pliers arms (2, 3) are made by forging technology. Pliers according to one of claims 1 to 17, characterized in that the pliers arms (2, 3) have a gripping portion (7, 8), wherein in the gripping area a framework (20) is formed and / or that in the gripping portion (7, 8 ) at least in sections circumferentially a strut (17) is formed.

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