ES2527278T3 - Extensible pliers with drive lever - Google Patents

Abstract

Pliers, particularly extensible pliers (1), presenting a first arm of the pliers (2) and a second arm of the pliers (3), which are rotatably connected to each other through a rotation axis (4), where one arm of the pliers (2, 3) has a longitudinal hole (15) with a sawtooth profile (16) configured in the longitudinal hole (15) and the other arm of the pliers (2, 3) is configured as rotating way around a locking piece (19) disposed therein, where the locking piece (19) can move, particularly with translational movement, in a release position in the longitudinal hole (15), and in a position of Locking is arranged by means of a gear in continuous connection in the profile of saw teeth (16), so that it can be locked, where the locking part (19) is held in the locked position by a spring force, where the first arm of the pliers (2) have between one side or (29) and a lower side (28) a longitudinal groove (24), where the second arm of the pliers (3) crosses the first arm of the pliers (2) in the longitudinal groove (24), characterized in that the first arm of the pliers (2) has on the upper side (29) and on the lower side (28) guide holes (27), where the locking piece (19) is arranged in the guide holes (27) movable in a manner axially and rotatably, where a drive lever (18) can be rotated around a deflection point (25) on the upper side (29), and the locking piece (19) can be moved against the spring force by means of the operating lever (18) from the locked position to the release position in the axial direction

Description

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DESCRIPTION

Extensible pliers with drive lever

The present invention relates to pliers, particularly extensible pliers, according to the preamble of claim 1.

Extensible tongs are known from the state of the art, which are particularly used by plumbers in the installation of heaters, as well as in the installation of sanitary facilities or also in the placement of water pipes. Extensible pliers are characterized by having two long pincer arms, which due to the law of the lever allow a high grip force between the jaws of the pliers when operated only with one hand. So that the extensible pliers can be used versatilely and so that they are suitable for gripping nuts of different sizes, for example nuts with a diameter for a jaw opening of 10 to a jaw opening of 28 or even 32, and can also be grasped with The extendable pliers with different tube diameters, the extendable pliers have an adjustment mechanism that allows to move the two arms of the pliers with a relative translational movement such that the jaws of the pliers can be adjusted variably with each other in their distance it means. When the desired basic adjustment is reached, the two arms of the pliers relatively displaced relative to each other by means of the adjustment mechanism are set in a rotating manner, so that when a movement of the pliers is carried out, the jaws of the pliers They open and close. Once they have been finished using, the extensible pliers are usually moved back to a starting position, so that the jaws of the pliers essentially fit together in continuous connection, so that an injury is prevented, for example a crush, due to a careless work movement.

The usual extendable pliers in commerce are unlocked by a wide opening of the two arms of the pliers with each other, so that the translational movement can be carried out. For this, basically two hands are necessary, which then allow a correspondingly wide distance of the two arms of the pliers and a subsequent translation movement, as well as a movement of the arms of the pliers towards each other, with which these by their part is fixed in a rotating position with each other.

For improved handling, particularly in the case of a reduced workspace, extensible pliers of document DE 33 03 369 A1 are known, in which there are two pincer arms inserted into each other, where in a pincer arm Inside there is a longitudinal hole configured, and the longitudinal hole has a serrated profile that surrounds the edge. The second arm of the pliers is rotatably housed around a locking piece, the locking piece being able to move in translational movement in the longitudinal hole, and being able to be moved by an orthogonal axial movement with respect to the direction of the longitudinal hole a Two different positions. In this way, a first position is adopted by means of the locking piece, in which the two arms of the pliers are fixed in a translatory position, but rotatably housed together.

Also known are pliers of EP 1 052 066 A2 or also DE 198 06 653 A1, in which two pincer arms are relatively coupled to each other by means of a locking piece for adjusting an amplitude of opening of the pliers.

If the locking piece is moved axially to a second position, a translational movement of the locking piece within the longitudinal hole is possible. In order for the locking piece to be basically held in a locked position, a pressure force is exerted on the locking piece through a leaf spring. In this way the possibility of adjustment improves, particularly in the case of only a limited workspace, for example in the case of mounting in the intermediate space of several placed pipe branches. The handling, particularly one-handed operation to adjust the extensible pliers, is only possible, however, conditioned with a great skill by the installer who uses them.

In addition, the pliers have a very massive configuration in a transition zone that extends between the jaws of the pliers and the arms of the pliers, so they have a high own weight in the head load, due to the material of the pincer arms in the transition zone, as well as the locking piece. Due to the load of the pincer head, where the head load is arranged at the opposite end of the pincers, in which they are held by the installer who uses them, the pincers here have a high inertia and are required in High operating forces are used for several hours to move the pliers several hundred or even thousands of times in a work day to different tool grip positions.

The task of the present invention is, based on the state of the art, to improve pliers, particularly extensible pliers, in such a way that with an economical production, on the one hand they are easier to handle and also provide increased rigidity. It is also the task of the present invention to improve the possibility of handling the pliers.

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The aforementioned task is solved according to the invention with pliers, particularly extensible pliers, according to the characteristics of claim 1.

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

The invention relates to pliers according to the preamble of independent claim 1.

The task of facilitating the handling of the pliers is solved with the characterizing features set forth in independent claim 1.

Within the framework of the invention, the locking piece can be moved with translational movement in the longitudinal hole, which is considered as the preferred embodiment. In addition, the longitudinal hole itself can also have a curved configuration, the longitudinal hole, for example, has an arc-shaped course. The locking piece can then move into the longitudinal hole following the arc-shaped course. The longitudinal hole can thus follow in an arm of the pliers, its course, which can also have a curved configuration. As an advantage, the edges of the longitudinal hole would then be configured with a thickness that would remain essentially the same, since both the longitudinal hole in this case, as well as the pincer arm, have the same course.

Within the framework of the invention, in the case of the sawtooth profile disposed in the longitudinal hole, any type of profiling that can be engaged in continuous connection in a limited number of positions can be treated. In this way the sawtooth profile can be configured for example by saw teeth with a triangular or pyramid shaped cross-sectional configuration, but a wavy profile or a profile with another type of geometric shape can also be configured, where The geometric shape can be engaged with the locking piece in continuous connection in a limited number of different positions in a fixed position.

Within the framework of the invention, the individual teeth or also the profile depressions can be aligned directly next to each other or also have a distance from each other, so that, for example, only two or three different fixed positions are possible. In the context of the invention, however, they may also be directly adjacent teeth, which allow, for example, 10 or even 20 different locking positions by means of the translational movement of the two arms of the pliers together.

The actuating lever is a lever that is oscillatingly arranged in the pliers, particularly in an arm of the pliers, and which is coupled with one side in continuous connection with the locking piece and which can be operated manually on the side opposite to East. The actuator lever can preferably be pressed with a thumb of an installer who uses it in the direction of the tongs, where by moving the lever, the locking piece is moved from the locked position to the release position. Following this, it is possible to move the two arms of the pliers towards each other with translational movement, for example by surrounding them with an inner surface of the hand, as well as with the remaining four fingers and by means of a displacement of fingers and surface of the hand.

Due to the law of the lever of the drive lever, only reduced forces are necessary, which are necessary to overcome the spring force and thereby unlock the locking piece. There is no need to exert pressure directly on the locking part, but rather an easy-to-operate drive is achieved and at the same time strength is saved by the lever. At the same time, however, it is guaranteed that a sufficient pretension is ensured by means of a spring force that fits the locking piece in the locked position, so that safe operation of the pliers is possible.

Preferably the actuation lever is housed in an arm of the tongs around a tilting bolt and surrounds the locking piece on the side of the head. For this purpose, the locking part has a particularly cylindrical head that is very particularly shaped in one piece in the locking part, and is either grasped underneath by a fork of the operating lever or is grasped from behind in continuous connection in a housing opening of the operating lever. When operated, the locking part and the actuating lever carry out a relative movement with each other, so that a simple movement of the locking piece from the locked position to the release position, and the position of movement is possible. release back to the locked position, without the locking piece tilting into the arms of the pliers.

In an advantageous configuration, the pliers have a first arm of the pliers and a second arm of the pliers, and the two arms of the pliers are rotatably connected to each other through a rotation axis, where each arm of the pliers it has a grip section, a head section, jaws arranged in the head section and a transition section that extends between the head section and the grip section, and the pincer arms are configured so that they can move with translational movement with each other, with which an amplitude of opening of the jaws can be modified, and the pliers have particularly the characteristics described above, solved because at least one arm of the pliers has a framework structure in the head section , where the framework structure presents

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an optimized force flow and / or the jaws have a grip area and a tip, where the rotational movement of the pincer arms that can be carried out by the pincer arms is limited in such a way that in the If the pliers are completely closed, the distance between the jaw tips is always smaller than the distance between the jaws in the grip area.

A framework structure is understood within the framework of the invention to be a structure that is configured from cross-members arranged in a networked manner and intermediate spaces arranged between the cross-members. The crossbars protrude in front of the empty spaces, where the orientation of the crossbars with each other is chosen depending on the flow of force to be expected. In this way it is possible to optimize the pliers in their weight, particularly in the area of the head side or in the transition zone that extends from the head area to the grip area, maintaining at least the same stiffness. In this way it is a clearly easier maneuverability, so that the extremities of the arm of the installer who uses them, remain protected, since it has to use clearly reduced forces to rotate the tongs to the corresponding working position.

In addition, the tongs are much cheaper to produce due to the saving of material precisely in this area. The high stiffness properties, where the stiffness properties remain at least equal despite the material savings, when they are not even greater than in the case of conventionally produced extendable pliers, are achieved through a production of arm forging technology of the tongs.

An additional advantage of the extensible pliers according to the invention is that the objects to be placed in the grip area between the jaws can always be grasped well with a hand movement of the pliers in the grip sections of the pliers arms , due to the distance between the tips of the jaws with each other in case the tongs are completely closed. Due to the reduced distance of the jaw tips from each other, in case the jaws are completely closed, in front of the distance of the jaws from each other in the gripping area, it is prevented from leaving a gripped object, for example such a large tube, with an outer tube diameter, of the grip area.

In the context of the invention, the actuating lever is particularly advantageously configured in such a way in an arm of the tongs, which extends from a transition section, which is between a head section and a grip section in a pincer arm, at least by sections towards the grip section. The actuation lever is therefore configured as an elongated construction element and grips the locking part, which is located in the area of the head side of the transition section, where the section side is Transition opposite to this one, extends at least by sections towards the grip section, so that it is operable from the grip section during a grip of the correct and safe extensible pliers. The drive is carried out particularly with a thumb or index finger, that is, a finger which, during normal operation of the extensible pliers, is oriented towards the head of the pliers. In this way it is possible to keep the tongs in the work area with a movement of the hand and still, adjust especially easily and easily in size.

So that the actuating lever can transmit the lever force gathered by a finger to the locking piece, the actuating lever is rotatably particularly advantageously housed in an arm of the pliers through a deflection point, where the deflection point is particularly configured as a cross bolt. In this case it is possible to mount the operating lever on the pincer arm and then insert the transverse bolt and secure it on the pincer arm, particularly riveting it. In this way, the actuation lever is also correctly disposed therein with an intensive daily use of the extensible pliers, and a failure of the actuation mechanism is avoided. Riveting occurs particularly advantageously in the configured locking part of a part. In the context of the invention it is also possible, however, to fix the cross bolt in another way. This can be carried out in continuous connection and / or in force drag connection and / or in material joining. It is particularly important that the cross bolt be permanently fixed with the pincer arm.

In the context of the invention, the spring force acting on the locking piece is exerted on the locking piece, particularly through the operating lever. To this end, a spring is particularly advantageously arranged between a driving section of the operating lever and an arm of the pliers coupled with the operating lever, particularly a compression spring or also a spring sheet. In this way it is possible that the spring is arranged away from the locking piece. A spring disposed in the area of the locking piece, leads in this area, due to movement, as well as abrasive wear, often to failures in other known extensible pliers with locking mechanism. A spring sheet, which is riveted on an arm of the tongs and which has a pretension force, which acts directly on the locking piece, is subject to wear in the profiling area due to the decrease in the force of spring in the case of intensive use for several years of extensible pincers of this type, and is also exposed basically to the danger of mechanical damage due to external influence. By moving the spring from the area of the adjustment and locking mechanism to a non-critical area on the arm of the pliers, these points are avoided. In this case, a compression spring is particularly suitable due to its properties of

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spring, since it does not lose its tension force in its spring force, nor in the case of intensive and daily use for several years.

In addition, the operating lever is particularly advantageously configured with a fork, where the fork surrounds the locking part with relative movement. In an alternative embodiment, the actuating lever is configured with an eccentric housing opening, where the housing opening can be coupled with relative movement with the locking piece. The housing opening is particularly blocked by way of bayonet with the locking piece, and the operating lever is mounted on the pliers.

In addition, the locking piece is preferably configured with a cylindrical head, the cylindrical head being particularly configured within the framework of the invention of a piece with the locking piece. In this way it is possible to absorb in a non-critical way the tensile forces that occur during the actuation of the locking piece. Faced with the configuration of the locking piece with a rivet, in this case there is always a danger during use of the failure of the construction element, which is prevented due to the configuration according to the invention of a single piece of the locking head. In combination with the fork or also with the housing opening, in this way it is particularly possible to couple the locking part and the operating lever with relative movement in continuous connection.

In addition, the actuating lever preferably has a curved housing surface in the coupling area with the locking part for gripping the cylindrical head from behind, where the curvature is oriented in the direction away from the arms of the tongs. Due to the curvature it is possible for the cylindrical head to produce a rear grip during the entire rotation movement of the actuator lever or a continuous grip below in such a way that the locking part does not tilt. Preferably the curvature has such a configuration in the cylindrical head, that a perpendicular that is respectively located on the curvature grasps the cylindrical head below orthogonally in the corresponding position. In this way an unbeatable axial movement of the cylindrical head is possible.

In addition, the first arm of the pliers is preferably provided in its transition section with a longitudinal groove, where the second arm of the pliers crosses the longitudinal groove with its transition section, and the second arm of the pliers has the hole longitudinally with the profile of saw teeth, and in the second arm of the tongs the locking piece can be moved with translational movement to the release position and is fixed in position in the locking position, where the locking piece continues to be housed in the first arm of the axially movable pliers, so that by axial displacement the locking position or the release position can be adopted, and the first arm of the pliers is rotatably housed around the locking piece. In this way it is possible that during the fixation in position of the locking piece inside the sawtooth profile, the movement of the tongs or the movement of grip can be carried out due to the rotating housing of the first arm of the tongs.

By adopting the locking piece in the release position, it is possible to move the locking piece into the longitudinal hole of the second arm of the pliers, where the two arms of the pliers are held in position with each other by the longitudinal groove and the second pincer arm that crosses the longitudinal groove in the direction of axial movement of the locking piece. Due to this, it is also possible according to the invention, that the extensible pliers are limited to a minimum of the construction parts to be used, since no type of housings, spring elements or other rivets, ring rings are used in the coupling area. fixing or similar, additional. The coupling area is particularly configured only by the first and second arm of the pliers, as well as by the locking piece that rotatably engages the two arms of the pliers. To actuate the locking part, the actuating lever according to the invention is also provided. Other construction elements are avoided in the coupling area, for example fixing rings, springs or the like.

In addition, the first arm of the pliers is particularly preferably configured in such a way that at least one housing is provided on the upper side for the operating lever and on the lower side, as well as on the upper side, they have guide holes, where the locking piece passes through the first arm of the tongs in the guide holes in an axially displaceable manner and in a rotating manner. The locking piece can also move in the guide holes in its axial direction to adopt the locking position or the release position, and can also be placed during the first assembly in the pliers. In addition, the first arm of the pliers is then rotatably arranged around the locking piece, so that the movement of the pliers can be carried out by means of the turning movement. Advantageously, the operating lever then also rotates with the rotational movement of the first arm of the pliers, around the locking piece. In this way the operating lever is also arranged in the fork area or in the housing opening so that it can rotate around the locking part.

The actuation lever also has an extension on one actuation side, where the extension has a configuration such that it is inserted into the housing on the upper side of the first arm of the pliers, and in the release position, that is, when the operating lever, comes into contact in the

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lower side of the first arm of the pliers in a delimiting manner. In this way, it is possible to limit the operating lever during its handling in its turning movement. In addition, no additional means of blocking or delimitation are necessary in this way on the blocking part itself, due to the continuous coupling of the operating lever with the blocking part. The locking part is thus limited by the actuator lever in continuous connection in its axial displaceability in the locked position and release position. In this way, the fixing ring constructions or other position fixations in the locking part are completely suppressed.

Advantageously, a compression spring is also provided in the extension, whereby a simple and at the same time effective and long-lasting kinematic coupling of the adjustment mechanism and the rotation movement is given, in order to carry out the movement of the tongs.

In addition, particularly preferably, the guide hole is configured on the bottom side in a round manner. Particularly the locking part is also configured on its lower side in a round manner, where in this case it has a particularly advantageous round section. In this way it is possible to enable at least one side of the pliers a continuous connection between a round guide hole and a round section, which ensures a load as high as possible when carrying out the movement of the pliers. In addition, teeth are advantageously arranged in a central area of the locking piece, where the teeth are configured in correspondence with the profile of the saw teeth. In the case of profile profiles of the saw teeth aligned next to each other, directly adjacent, in a triangular shape, the teeth of the locking piece also correspondingly have a triangular shape configuration, directly adjacent.

The locking piece is also particularly advantageously configured in such a way that it has a central area, where two parallel walls are arranged in the central area and the teeth protrude in front of the walls, where the walls have a distance from each other, which corresponds to that of the tips of the profile of the saw teeth of the longitudinal hole, so that in the release position a sliding in continuous joint is possible within the longitudinal hole, where in the locked position the teeth can be engaged with the profile of the saw teeth fixed in position in continuous union. By means of the two walls configured in parallel it is possible in this way that the walls are arranged between the tips of the profile of the saw teeth of the longitudinal hole, and in this way enable on the one hand a fixation in position in the locked position due to the teeth that protrude in front of the walls, and on the other hand allow in the release position a slide on the tips of the profile of the saw teeth.

In addition, the length of the walls is preferably configured at least in correspondence with the distance between two tips of the sawtooth profile. In this way it is guaranteed that when adopting the release position and during a translational movement, the locking part does not tip inside two opposite sawtooth profiles of the longitudinal hole, but is guided in the direction of the degree of freedom of translation in such a way that the locking piece always moves in parallel within the longitudinal hole.

The pincer arms are produced particularly with forging technique, which results in high stiffness characteristics and at the same time potential for weight savings. By constructive minimization according to the invention of the necessary construction elements, the pincer arms can thus be configured directly and engaged in a rotating manner through the locking piece, without additional housings or the like being necessary. Within the framework of the invention, the arms of the pliers are produced in particular from a steel material, where the locking part is also configured very particularly advantageously from a steel material. The operating lever can also be configured within the framework of the invention from a steel material, notwithstanding a light metal or also from a plastic material.

The arms of the pliers also have a particularly advantageous framework in the gripping section and / or in the gripping section there is at least a cross-sectional configuration of a crossbar. By means of the framework configured in the grip section, it is possible to further reduce the specific own weight of the tensile tongs according to the invention, the stiffness characteristics being equal, particularly in the grip section strongly influenced by the grip force. In addition, there is the possibility by means of the surrounding crossbar at least in sections, to increase the rigidity in the grip section and at the same time to configure the surface that is available to exert the force of the hand on the extensible pliers With a size such that the grip surfaces do not cut the hands of an installer who uses them, but there is enough grip surface to exert the force of the hand.

The aforementioned characteristics can be combined with each other in any way within the framework of the invention with the advantages that result, without thereby abandoning their framework.

Other advantages, features, properties and aspects of the present invention are part of the following description. Schematic figures show preferred embodiments. They show:

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Figure 1 extensible pliers according to the invention in open position;

Figure 2 extensible pliers according to the invention in closed position;

Figures 3 and 4 a cross section through the extensible pliers along section line A-A;

Figures 5 and 6 a cross section through the extensible pliers along section line B-B;

Figures 7 and 8 a drive lever according to the invention in side view and plan view;

Fig. 9 the actuation lever according to the invention with locking part in a perspective view;

Figures 10 and 11 a second variant embodiment of the extensible pliers according to the invention with drive lever and fork;

Fig. 12 a drive lever according to the embodiments of Fig. 10 and Fig. 11 and

Figure 13 the extensible pliers according to the invention with axial enlargement being carried out in the closed state.

The same references are used in the figures for the same or similar construction elements, also in the case that a repeated description is deleted due to simplification reasons.

Figure 1 shows extensible pliers 1 according to the invention, which have a first arm of the pliers 2 and a second arm of the pliers 3, where the two arms of the pliers 2, 3 are rotatably coupled to each other around a axis of rotation 4. The extensible pliers 1 according to the invention also have a locking mechanism, which allows to carry out a translation adjustment movement 5 between the first 2 and the second 3 arms of the pliers, whereby the opening width 6 of the extensible pliers 1. Each arm of the pliers 2, 3 also has a gripping section 7, 8, a head section 9, 10, as well as jaws of the pliers 11, 12 arranged in the section of head 9, 10, and a transition section 13, 14 extending between the head section 9, 10 and the grip section 7, 8.

In order to carry out the translation adjustment movement 5, a longitudinal hole 15 is provided in the transition section 13, 14 of the second arm of the pliers 3, where the longitudinal hole 15 presents at its outer edges respectively a tooth profile of saw 16. The two arms of the pliers 2, 3, furthermore present in the grip section 7, 8 respectively an outer cross member 17 at least in sections, which extends in the grip section 7, 8 the support surface for the hand of an installer who uses them.

According to the invention, an actuating lever 18 is provided in the extensible pliers 1, which, when operated, moves a locking piece 19, not shown here in greater detail, in an axial direction, so that it is moved from a locked position to a position release and carries out the translation adjustment movement 5. If the locking piece 19 is arranged in the locking position, then the two arms of the pliers 2, 3 are rotatably housed around the axis of rotation 4.

The extendable pliers 1 according to the invention also have in the head section 9, 10 a framework 20, where the framework 20 is configured from cavities 21, as well as crossbars 22 housed between the cavities 21. In this way it can be precisely saved in the head area of the arms of the pliers 2, 3 material in addition to weight, so that the extensible pliers 1 can clearly be produced more economically, maintaining at least the same stiffness, and have a lower proper weight.

Figure 2 shows the extensible pliers 1 in a starting position, where the translational movement 5 is carried out in such a way that the extensible pliers 1 have the smallest possible opening amplitude. A section line A-A is shown, which is explained in more detail in Figure 3 and Figure 4.

Figure 3 shows the extensible pliers 1 of Figure 2 in the starting position. The blocking part 19 is arranged in this case in the blocking position. By actuating the actuating lever 18 it is possible to move the locking piece 19 in the axial direction 23, so that the locking piece 19 shown in FIG. 4 adopts a release position. In the release position, teeth, not shown here in greater detail, have been removed from the gear in continuous connection of the sawtooth profile, so that a translation displacement movement 5 is allowed within the longitudinal hole 15 between the first arm of the pliers 2 and the second arm of the pliers 3.

So that the arms of the pliers 2, 3 are held in a position in continuous connection with each other in the axial direction 23, the first arm of the pliers 2 has in its transition section 13 a longitudinal groove 24, where the

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second arm of the pliers 3 continuously crosses the longitudinal groove 24 of the first arm of the pliers

2. Drive lever 18 is moved by drive to the release position. To this end, the operating lever 18 has been rotated around a deflection point 25. So that the locking piece 19 does not fall outside the first 2 and the second 3 arm of the pliers, the operating lever 18 is arranged in a housing. 26 within the first arm of the pliers 2 in a collapsible manner, where the locking piece 19 is fixed in axial position in a movable manner in continuous connection by means of guide holes 27. The guide holes 27 are represented in this case only on a lower side 28 of the pincer arm 2, however, they are also configured in the second pincer arm 3 and also on an upper side 29 of the pincer first arm

2.

The operating lever 18 has an extension 30, where the extension 30 comes into contact in continuous connection with the lower side 28 of the first arm of the pliers 2 in the release position and thus limits the rotational movement of the lever drive 18 around the deflection point 25. In addition, the drive lever 18 grabs the locking part 19 below by a cylindrical head 31, so that by actuating the operating lever 18, the locking part 19 It performs an axial movement. In figure 3 and figure 4, the cross-members 17 respectively of the gripping section 7 of the first arm of the pliers 2 are also shown.

Figure 5 and Figure 6 further show a cross-section according to section line BB of Figure 2. In Figure 5 the locking piece 19 is in the locked position, where on the contrary in Figure 6 the part of lock 19 has been brought to a release position by actuating the operating lever

18. Figure 6 shows the profile of saw teeth 16 of the longitudinal hole 15, the locking piece 19 showing teeth 32, which in figure 5 are engaged in continuous connection with the profile of saw teeth 16.

In figure 3 and in figure 4 it can also be seen that the operating lever 18 is arranged approximately inside the upper side 29 of the first arm of the pliers 2, sunk or aligned, so that there is no risk of injury due to an unnecessary coupling on the actuation lever 18. The actuation lever 18 is also protected in this way against mechanical damage and at the same time there are no attack points for soiling, therefore also in the case of use intensively, an impression of aesthetic assembly of the extensible pliers 1 according to the invention is maintained.

The actuation lever 18 is also shown in Figure 7 in a side view. The extension 30, as well as a mounting hole 33 to pass a rotating bolt not shown in greater detail, to enable the deflection point can be well recognized. The operating lever 18 also has an operating side 34. On the side opposite to the operating side 34, the operating lever 18 also has a housing side 35, where on the housing side 35, shown in FIG. 8, there is a housing opening 36 that is used for coupling in continuous connection with the locking piece, which is not shown here in greater detail. It can also be seen that on the housing side 35 a curved housing surface 37 is arranged, so that during actuation, a perpendicular surface N represented respectively, grasps, essentially orthogonally, the blocking part not shown here in greater detail, by its cylindrical head.

In figure 9 it is further shown that on the drive side 34 of the drive lever 18 there is a compression spring 38. The compression spring 38 then comes into contact in continuous connection according to figures 3 and 4, between the extension 30 of the operating lever 18 and the lower side 28 of the first arm of the pliers 2, and exerts a spring force on the locking part 19 through the operating lever 18. The locking part 19 is also shown with the cylindrical head 31 in gear in continuous connection with the housing opening 36 of the operating lever 18. In this case it is conceivable, for example, that the locking piece 19 is locked as a bayonet in the housing opening 36. locking piece 19 also has teeth 32, which can then be engaged in continuous connection with the sawtooth profile, not shown in greater detail, of the longitudinal hole of the second arm of the tees. you are born

Figures 10, 11 and 12 show another variant embodiment of the extensible pliers 1 according to the invention, where again a frame 20 with cavities 21 and crossbars 22 is configured in a head section 9. a fork 39, which grips the cylindrical head 31 of the locking piece 19 in continuous connection, thus enabling the configuration of the locking piece 19 in such a way as to have a round section 40 in accordance with FIG. a lower side 28. According to Figure 12, the gear in continuous connection between the operating lever 18 and the locking piece 19 is shown in greater detail due to the fork 39. The fork 39 grasps the cylindrical head 31 in continuous connection. configured in one piece in the locking piece 19. The fork 39 also has guide grooves 41, which hold the cylindrical head 31 behind in continuous connection and the guide fixed in po position. In addition, a round section 40 is configured on a lower side 42, which is then engaged in continuous connection in a guide hole of the first arm of the pliers and can therefore transmit high forces here to carry out the movement of the tongs.

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The locking piece 19 also has a coating surface 43, which then transmits particularly forces in the locked position inside the guide hole on the upper side of the first arm of the pliers. In the locking part 19, the teeth 32 are also arranged, which in the locked position can be engaged in continuous connection with the sawtooth profile. The locking piece 19 also has two parallel walls 44, where the teeth 32 are arranged on the walls 44, and the walls 44 guide the locking piece 19 in the release position and in the blocking position in continuous connection through the Longitudinal hole between the tips of the sawtooth profile.

Figure 13 shows the extensible pliers 1 according to the invention, in a representation, in which the two arms of the pliers 2, 3 have moved towards each other. In this case, an angle between the jaws 11, 12 results that the distance a1 between the tips 45 of the jaws 11, 12 is always smaller than a distance a2 or a3 parallel to it, which occurs in the grip area 46 between the jaws 11, 12. This prevents a seized object from leaving the jaws of the arm of the tongs 2, 3.

References 1-extendable pliers 2-first arm of the pliers 3-second arm of the pliers 4-axis of rotation 5-translation movement 6-amplitude of opening 7-grip section of 2 8-grip section of 3 9- head section of 2 10-head section of 3 11-jaw of the jaws of 2 12-jaw of the jaws of 3 13-transition section of 2 14-transition section of 3 15-hole longitudinal 16-profile of saw teeth 17-crossbar 18-drive lever 19-locking piece 20-frame 21-cavity 22-crossbar 23-axial direction of 19 24-longitudinal slot two 25-point deflection 26-housing 27-guide hole

E13156907

12-30-2014

28-lower side of 2 29-upper side of 2 30-extension 31-cylindrical head

5 32-tooth 19 33-mounting hole 34-drive side 35-housing side 36-housing opening

10 37-curved housing surface 38-compression spring 39-fork 40-round section 41-guide groove

15 42-bottom side of 19 43-cladding surface 44-wall 45-tip 46-grip area

twenty

N-perpendicular surface

Claims (16)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty E13156907 12-30-2014

one.

Pliers, particularly extensible pliers (1), presenting a first arm of the pliers (2) and a second arm of the pliers (3), which are rotatably connected to each other through a rotation axis (4), where one arm of the pliers (2, 3) has a longitudinal hole (15) with a sawtooth profile (16) configured in the longitudinal hole (15) and the other arm of the pliers (2, 3) is configured as rotating way around a locking piece (19) disposed therein, where the locking piece (19) can move, particularly with translational movement, in a release position in the longitudinal hole (15), and in a position of Locking is arranged by means of a gear in continuous connection in the profile of saw teeth (16), so that it can be locked, where the locking part (19) is held in the locked position by a spring force, where the first arm of the pliers (2) have between one side or (29) and a lower side (28) a longitudinal groove (24), where the second arm of the pliers (3) crosses the first arm of the pliers (2) in the longitudinal groove (24), characterized in that the first arm of the pliers (2) has on the upper side (29) and on the lower side (28) guide holes (27), where the locking piece (19) is arranged in the guide holes (27) movable in a manner axially and rotatably, where a drive lever (18) can be rotated around a deflection point (25) on the upper side (29), and the locking piece (19) can be moved against the spring force by means of the operating lever (18) from the locked position to the release position in the axial direction.

2.

Pincers according to claim 1, characterized in that the actuation lever (18) extends from a transition section, which is between a head section (9, 10) and a grip section (7, 8) on one arm of the pliers (2, 3), at least in sections towards the grip section (7, 8).

3.

Pincers according to one of claims 1 or 2, characterized in that the deflection point (25) is formed by a transverse bolt.

Four.

Pincers according to one of claims 1 to 3, characterized in that the spring force of the locking piece (19) is exerted on the locking piece (19) through the operating lever (18), particularly a spring between a drive section and the pincer arm (2, 3) coupled with the drive lever (18), preferably a compression spring or a spring sheet.

5.

Pincers according to one of claims 1 to 4, characterized in that the actuator lever (18) has a fork (39), where the fork (39) surrounds the locking part (19) with relative movement, or that the lever drive (18) has an eccentric housing opening (36), where the housing opening (36) can be coupled with relative movement with the locking piece (19).

6.

 Pincers according to claim 5, characterized in that the locking piece (19) has a cylindrical head

(31) configured in one piece, where the cylindrical head (31) is gripped from behind in continuous connection by the fork (39) or by the housing opening (36).

7.

 Pincers according to one of claims 1 to 6, characterized in that a curved housing surface (37) is configured in the actuating lever (18) to grip the cylindrical head (31) behind, where the curvature is oriented away from the pincer arms (2, 3).

8.

Pincers according to one of claims 1 to 7, characterized in that the first arm of the pliers (2) has in its transition section (13) the longitudinal groove (24), where the second arm of the pliers (3) crosses through its transition section (14) the longitudinal groove (24), where the second arm of the pliers (3) has the longitudinal hole (15) with the profile of saw teeth (16), and the locking piece (19) it is housed axially movable in the first arm of the pliers (2), and the first arm of the pliers (2) is rotatably housed around the locking piece (19).

9.

Pliers according to one of claims 1 to 8, characterized in that the first arm of the pliers (2) has on one upper side (29) at least one housing (26) for the operating lever (18).

10.

 Pincers according to claim 9, characterized in that the actuation lever (18) has an extension (30) on the actuation side (34), where the extension (30) is inserted into the housing (26) of the upper side (29) ) and in a release position comes into contact with the lower side (28).

eleven.

Pincers according to claim 10, characterized in that a compression spring (38) is arranged on the extension (30).

12.

Pincers according to one of claims 1 to 11, characterized in that the guide hole (27) has a round configuration on the lower side (28).

eleven E13156907 12-30-2014 13. Pincers according to one of claims 1 to 12, characterized in that the locking part (19) has a round section (40) on a lower side (28) and in a central area there are teeth (32), where teeth (32) are configured in correspondence with the sawtooth profile (16). 14. Pincers according to one of claims 1 to 13, characterized in that the locking piece (19) has a 5 central zone, where two parallel walls (44) are arranged in the central zone, and the teeth (32) protrude in front of the walls (44), where the walls (44) have a distance from each other, which corresponds to the of the tips of the sawtooth profile (16) of the longitudinal hole (15), so that a sliding in continuous connection within the longitudinal hole (15) is possible in the release position, where in the locked position they can be engaged. the teeth (32) with the profile of saw teeth (16) in continuous connection fixed in position. 15. Pincers according to claim 14, characterized in that the length of the walls (44) corresponds at least to the distance between two points of the sawtooth profile (16).

16.

Pincers according to one of claims 1 to 15, characterized in that the pincer arms (2, 3) are produced by forging technique.

17.

Pincers according to one of claims 1 to 16, characterized in that the pincer arms (2, 3)

15 have a grip section (7, 8), where a frame (20) is configured in the grip section and / or a crossbar (17) is configured in the grip section (7, 8) at least by sections 12