EP2252435A1

EP2252435A1 - Pliers that can be actuated with one hand

Info

Publication number: EP2252435A1
Application number: EP09718388A
Authority: EP
Inventors: Andreas H. Groten; Oliver MÖLLER
Original assignee: Will Werkzeuge GmbH and Co KG
Current assignee: Will Werkzeuge GmbH and Co KG
Priority date: 2008-03-06
Filing date: 2009-03-06
Publication date: 2010-11-24
Anticipated expiration: 2029-03-06
Also published as: DE102008012969A1; WO2009109650A1; EP2252435B1

Abstract

The invention relates to a pair of pliers that can be operated with one hand, comprising two limbs (2, 3), which upon power operation are latched to each other by means of an engagement part (5), wherein furthermore the limbs (2, 3) are guided to intersect each other by a guide of one limb (2) between a guide stop (6) and the engagement part (5), which are held on the other limb (3). In order to provide pliers that can be actuated with one hand, wherein advantageous latching between the engagement part and the matching toothing is achieved, it is proposed that the engagement part (5), together with the guide stop (6), is disposed on a mounting part (4) that can be moved relative to the other limb (3).

Description

One-hand operated pliers

The invention relates to a one-hand operated pliers with two pliers limbs, which are mutually interlocked by means of an engagement part with force actuation, wherein the pliers legs further guided by a guide of a pliers leg between a guide stop and the engagement part, which are supported on the other pliers limb, crossing each other Further, on one side of the crossing region of the forceps limbs, a forceps jaw and on the opposite side below the crossing region on the forceps limb grip portions are formed, wherein moreover the forceps arms via a control element and a spring drive, which biases the forceps jaw in an open position, which opening position is automatically spring-loaded after discharge of the grip sections, wherein, moreover, in a first movement section of the spring drive, the forceps jaws move toward one another and in a second position A section of the engagement part is engaged in a locking toothing of a pliers limb, after which a force rotation of the movable forceps jaw is performed around the engagement part.

One-handed actuable pliers have already become known in various embodiments. For this, reference is made, for example, to WO 2004/103 646 A2, and further to WO 00/13856.

In addition, DE 299 07864 U1 is also known from the prior art. Here is a spring drive provided, which also gives the control.

In the subject matter of the latter document, the guide stop and the engagement member are each fixedly connected to the respective forceps limb, in the sense of the above statements, the other forceps limb formed. During the force operation of the pliers, after locking, The teeth of the engaging part and the counter teeth must necessarily move against each other to achieve a closing of the pliers. The gearing must be turned off. Based on the latter document, the invention has the object to provide a one-hand operated pliers, in which a favorable locking between the engagement part and the counter toothing is achieved.

A possible solution of the problem is given by a first inventive concept by the subject-matter of claim 1, wherein it is pointed out that the engagement part is arranged together with the guide stop on a relative to the other pliers leg movable support member. The one pliers limb is, as it were, guided on a support platform of the other pliers limb, which support platform has the counterstop and the engagement part. Thus, a decoupling of the toothing is given to the other pliers legs. The teeth can be made cheaper.

Further features of the invention are explained below, also in the description of the figures, often in their preferred assignment to the already discussed claim concept, but they can also be in an assignment to only one or more individual features of this claim or independently.

Preferably, the support member has a circular plan. It is also preferred as a platform embedded in the other pliers legs. It can for example be screwed or riveted to the other pliers legs.

It is further preferred that, in particular in the case of a plugged forceps, the support member according to the crossing of the pliers legs captive in the one pliers leg passing through other pliers legs is held. The one pliers leg has a fork-shaped configuration in the crossing region, with one fork leg extending above the other and the other fork leg below the other pliers leg. Here, the support member may be inserted only in the other pliers legs, but nevertheless just held captive due to or cross-fork legs. In further detail, the holding part can be formed, in particular in this connection, as a disk inserted in principle only into a corresponding bore of the other tong leg. It requires no support of the support member with respect to the other pliers legs. If one were to think away from one pliers limb, in the case in question the fork legs extending above and below the other pliers limbs, the support part would fall out of the other pliers limb or be lifted out, regardless of which direction (up or down) , At the same time in the assembled state of a pliers legs due to the course between the guide stop and the engagement part is positively held relative to the other pliers legs just by means of the support member.

It is further preferred that the engagement part has an engagement tooth formation whose tooth tips follow a curved line. An enveloping tooth tip is therefore deviating from a straight line. Regardless of a relative rotational position of the engagement member to the other pliers leg a favorable gear engagement is achieved. In addition, since once the meshing engagement once reached basically does not need to follow a movement of the forceps leg, this arrangement of the meshing teeth is also possible.

While the tooth tips of the engagement part preferably follow a curved line, the tooth tips follow the teeth on the movable forceps limb. formed counter toothing preferred a straight line. With regard to the tooth tips of the engagement part, however, an embodiment may be provided in which two or more tooth tips each end along a straight line, but the next two or more tooth tips with respect to this first straight line end along a straight line to the first straight Line at an angle, preferably with this forms an acute angle. As a result, such a polygonal course can be adjusted with respect to the lines mentioned, for example, a quadrangle, hexagon, octagon, etc.

As already mentioned, it is further preferably also a plugged-through pliers, wherein the other pliers limb runs in a slot formed on the one pliers limb. In this case, it is further preferred that the mounting part forms a counterstop and an engagement part on both sides, that is to say facing both slot-forming fork legs of the one pliers limb. Accordingly, a counter-toothing is formed on both fork legs. In addition, however, only one-sided design of the stop and of the engagement part on the holding part, this further preferably combined with only one counter toothing on an associated fork leg, is provided.

Further preferably, it is provided that, after locking between the engagement part and the counter-toothing pivoting of the other pliers limb for closing the forceps jaw relative to the fixed support member is feasible. This Verschwenkbeweglichkeit total is also preferably provided limited angle. This formed by on the other pliers legs attacks. The stops are correspondingly outside of the support part. In the following, the invention will be further explained with reference to the accompanying drawing, which, however, represents only one embodiment. Hereby shows:

1 shows a plan view of the pliers after detection of a workpiece;

2 shows the pliers according to FIG. 1 in a perspective view obliquely from below (without workpiece); FIG.

Fig. 3 shows an enlargement of the forceps jaw area in the

Position according to FIG. 1;

4 shows a cross section through the pliers according to FIG. 3, cut along the line IV-IV; and

Fig. 5 is a view according to FIG. 1, in the open position.

With reference to FIG. 1, there is shown and described a single-handedly operated pliers 1 with two pliers limbs 2, 3, wherein an engagement part 5 is fastened to a retaining part 4 on the pliers limb 3, which is also referred to as another pliers limb is formed and a guide stop 6.

The pliers legs 2, 3 are guided crossing each other. On one side of the crossing region of the forceps arms 2, 3, a forceps jaw 7 is formed, and on the opposite side of the crossing region, grip portions are formed on the forceps arms 2, 3 (not shown in detail here).

The pliers 1 is biased into an open position, see FIG. 5, via a control element consisting in detail of two arms 8, 9. which is acted upon by a coil spring 10. In principle, the control and the spring can also be integrally formed in one piece, as described for example in the aforementioned DE 299 07864 Ul.

The support member 4 is arranged rotatable relative to the pliers leg 3.

As shown in detail in Fig. 4, the support member 4 is plate-shaped, wherein the circular rotary plate in a corresponding recess 11 in the forceps leg 3 is inserted. The recess 11 is circular, so it may be formed as a bore. The thickness of the plate member 4 is equal to the thickness of the pliers arm 3, at least in the surrounding area selected in the embodiment, wherein both the engaging member 5 and the guide member 6 are integrally formed integrally formed on the support member 4 on both sides in accordance with. In this respect, the production offers as a casting or sintered part. Alternatively, it can also be a circular plate part, to which then or the guide parts 6 and the one or more engagement parts 5 are mounted, such as screwed or welded.

The support member 4 is supported only by the pliers leg 2, namely the top and bottom of the support member 4 cross-fork leg of the pliers arm 2, in the crossing region of the pliers legs 2, 3 in the pliers leg 3. At the same time, the pliers limb 2 is held on the pliers limb 3 in a form-fitting manner by means of the support part 4 on account of the engagement parts and guide parts limiting its movement radially outward or inward with respect to the support part 4.

On the pliers leg 3 may further, as is apparent from Fig. 2, a trained outside of the support member 4 pivot stop 12 may be provided. A same swing stop can also be opposite, pliers mouth be provided with respect to an opposite pivoting limitation of a pivoting of the forceps leg 2 relative to the pliers leg 3 still.

As is further apparent from Fig. 2, there is in the embodiment of the spring drive with the control of a first, on the pliers leg 2 rotatably articulated arm 13 and a second, rotatably hinged to the pliers legs 3 link 14. Further, a coil spring 15 is provided a leg 16 is supported on the pliers limb 2, preferably the articulation region of the link 13 to the pliers limb 2. The other leg 15 is supported on the handlebar 14, there specifically in a slot 17, in which a corresponding bent end portion 18 of the spring 15 engages.

The link 14, which is designed as a flat part, as well as preferably in this respect the handlebar 13, has an offset 19 over its length. By means of a hinge pin 20, the links 13, 14 are connected to each other, wherein the bolt 20 at the same time receives a turn of the spring 15 and thus the spring 15 hal- tert. The spring 15 is biased into its extended position, so that when the pliers are unloaded, if necessary after a brief actuation without a workpiece clamped in the forceps jaw, the teeth are moved apart, the open position and thus also the rest position of the forceps 1 according to FIG. 5 established.

It is also important, see also FIG. 3, that the tooth tips 21 of an engagement part 5 follow a curved line L, which is preferably a circular line. The resulting in plan view contour line K of the guide stop 6 is also a curved line. On the other hand, the tooth tips 22 of the counter teeth formed in the exemplary embodiment on both fork limbs of the forceps limb 2 run along a straight line L ₁ . If the pliers from the position shown in FIG. 5 is moved against a workpiece W, due to the bias of the pliers leg 3 against the pliers leg 2, a process of pliers mouth jaws 23, 24 under conditioning of the respective guide stop 6 at an associated outer edge 25 of the pliers limb. 2 against each other, until the jaw jaws, 23, 24 respectively abut against the workpiece W. Then, the pliers leg 3 is currently pivoted about the contact area of the pliers mouth jaw 23 and the workpiece W until an engagement is steep 5 with the respective counter teeth in engagement, as shown in Fig. 1 and Fig. 3, for example. In addition, however, the pliers leg 3, for example, when the workpiece W has a certain flexibility, be further pivoted to the then relative to the pliers leg 2 fixed support member 4. The support member 4 can rotate relative to the pliers leg 3.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.

Claims

1. One-handed pliers with two pliers legs (2, 3), the at

Force actuation by means of an engagement part (5) are latched together, wherein further the pliers legs (2, 3) by a guide of a pliers limb (2) between a guide stop (6) and the engagement part (5), which at the other pliers limb (3) are held, are guided crossing each other, wherein on one side of the crossing region of the forceps arms (2, 3) a forceps jaw (7) and on the opposite side below the crossing region on the forceps arms (2, 3) handle portions are formed, wherein above in addition, the tong limbs (2, 3) are connected via a control element (8, 9) and a spring drive, which biases the forceps jaw (7) into an open position, which opening position is automatically spring-loaded after the grip sections have been relieved, wherein, moreover, in a first movement section of the spring drive, the pliers mouth jaws (23, 24) to drive towards each other and in a second movement cut an intervention f of the engagement part (5) takes place in a counter-toothing of the one pliers limb (2), after which a force rotation of the movable pliers jaw is feasible, characterized in that the

Engaging part (5) together with the guide stop (6) on a relative to the other pliers leg (3) movable support member (4) is arranged.

2. Pliers according to claim 1 or in particular according thereto, characterized in that the holder part (4) has a circular floor plan.

3. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the mounting part (4) According to the crossing of the pliers legs (2, 3) losier sure in the one pliers leg (2) passing through other pliers legs (3) is supported.

4. Forceps according to one or more of the preceding claims or in particular according thereto, characterized in that the engagement part (5) has an engagement tooth formation whose tooth tips (21) follow a curved line L.

5. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the tooth tips (22) of the forceps limb (2) formed counter-toothing along a straight line Li extend.

6. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that after Verrastung between the engagement steep (5) and the counter toothing Ver pivoting of the other pliers limb (3) for closing the forceps jaw (7) relative to the fixed support member (4) is feasible.