WO2009018917A1

WO2009018917A1 - Pliers

Info

Publication number: WO2009018917A1
Application number: PCT/EP2008/005927
Authority: WO
Inventors: Hardy Haberstroh; Michael Ketterer
Original assignee: Wiha Werkzeuge Gmbh
Priority date: 2007-08-08
Filing date: 2008-07-18
Publication date: 2009-02-12
Also published as: EP2176033A1; CN101790437A; DE102007037382B4; TW200924914A; DE102007037382A1

Abstract

The invention relates to a pair of pliers having two grip elements (3, 5) connected to one another by a joint (7) such that said grip elements are pivotable about a pivot axis, said pliers comprising two functional ends (9, 11) associated with the grip elements (3, 5), each comprising a cutting edge (13, 15), thus forming a cutting section (17), the grip elements (3, 5) being connected to the functional ends (9, 11) thereof via a joint plate (23, 25) and the joint plates (23, 25) each being located in a plane in which the pivot axis of the joint (7) is perpendicular. Said pair of pliers is characterized in that the contact plane (27) of the joint plates (23, 25) is located outside the middle of the joint (7) as measured in the direction of the pivot axis of the joint (7).

Description

tongs

description

The invention relates to a pair of pliers with two gripping elements according to the preamble of claim 1.

In the following, pliers are addressed which have two gripping elements pivotally connected to each other by a hinge. These are arranged on one side of the joint and continue on the other side in functional ends, which each have a cutting edge and thus form a cutting section. It has been found that in such pliers the forces to be applied for cutting objects are often very high. A particular disadvantage is that tilt the edges of the functional ends and thus show a poor cutting performance.

The object of the invention is therefore to provide a pair of pliers, which are characterized by improved cutting properties at lower forces.

To solve this problem, a pair of pliers is proposed, which has the features mentioned in claim 1. It comprises two gripping elements, which are pivotally connected to each other by a hinge, wherein the pivot axis of the gripping elements passes through the hinge. In addition, two of the handle elements associated functional ends are provided, which are arranged on the opposite side of the handle elements of the joint, each having a cutting edge and thus form a cutting section. In the region of the joint hinge plates are provided, which are arranged parallel to each other and each lie in a plane on which the pivot axis of the joint is vertical. On each of the two hinge plates, a handle element is mounted on one side and an associated function end on the other side. The pliers are characterized by the fact that the two hinge plates have different thicknesses. This results in that the contact plane of the two hinge plates is not located in the middle between the top and bottom of the joint of the pliers. The offset of the contact plane from a median plane of the joint prevents the hinge plates from tilting when objects, for example a wire or the like, are introduced into the cutting section of the pliers. It has also been found that the forces to be introduced into the grip elements when cutting objects are substantially lower than with conventional pliers.

Particularly preferred is an embodiment of the forceps, wherein the cutting portion with the contact plane between the two pivot plates forms an angle α. In this way, it is possible to introduce fewer torques in the functional ends when cutting objects, so that these and thus the hinge plate tilt less and the cutting forces are further reduced.

Another preferred embodiment is characterized in that the contact plane intersects the cutting portion in a region which faces the joint. By matching the angle α with the plane of contact, it is possible to ensure that tilting moments are further reduced. It has been found that the configuration of the forceps chosen here can be used both in combination, flat-nose or flat-nose pliers as well as side cutters and give the desired benefits in both types of pliers.

The invention will be explained in more detail below with reference to the drawing. Show it:

Figure 1 is a schematic diagram of the front part of a pliers designed as a pair of pliers in a bottom view;

Figure 2 is a side view of the reproduced in Figure 1 combination pliers;

Figure 3 is a front perspective view of the combination pliers of Figures 1 and 2;

Figure 4 is a schematic diagram of the front part of a trained as a side cutter pliers in bottom view;

FIG. 5 shows a side view of the side cutter according to FIG

4 and

FIG. 6 shows a perspective front view of the side cutter according to FIGS. 4 and 5.

The pliers 1 shown in FIG. 1 are designed as combination pliers. It has two here partially broken handle elements 3 and 5, which are pivotally connected to each other via a hinge 7. Whose pivot axis is perpendicular to the image plane of Figure 1. The first handle member 3 has a functional end and the second handle member 5 has a functional end 11. Here are the Handle elements 3 and 5 and the associated function ends 9 and 11 on opposite sides of the joint 7. The handle elements 3 and 5 are in the representation of Figure 1 maximally moved toward each other, so that the function ends 9 and 11 are closed and touching each other.

Each of the functional ends has a cutting edge, wherein a first cutting edge 13 is associated with the functional end 9 and a second cutting edge 15 is associated with the functional end 11 so that a cutting section 17 is formed, which immediately adjoins the joint 7. On the side facing away from the joint 7 of the cutting portion 17, a first gripping portion 19 is provided, which is formed by two - seen from the contact plane of the function ends - concave areas and is preferably provided with teeth to increase the gripping forces and to a rotation of the to prevent gripped object.

On the side facing away from the joint 7 of the first gripping portion 19, a second gripping portion 21 is provided, which is formed by two here substantially flat portions of the function ends, which face each other. The second gripping portion 21 serves to detect flat objects.

Overall, it turns out that the pliers 1, as stated, is designed as a combination pliers conventional type, which relates to the cutting portion 17 and the two gripping portions 19 and 21.

FIG. 1 also shows that a hinge plate 23 is provided between the first grip element 3 and the associated first functional end 9 in the area of the joint 7, to which the grip element 3 and the functional end 9 are attached on the one hand are. It is very possible, the handle element 3, the hinge plate 23 and the functional end 9 in one piece. The hinge plate 23 is cylindrical in the region of its free peripheral surface, so circular in plan view.

The pliers shown in FIG. 1 are shown in side view in FIG. The same parts are provided with the same reference numerals, so reference is made to the explanations for Figure 1.

In Figure 2, the second functional end 11 and the first handle member 3 are shown in plan view. Visible here is the hinge 7. In its area, the hinge plate 23 can be seen, which is arranged between the handle element 3 and the associated functional end 9, which is here hidden by the functional end 11.

In the region of the joint 7 and a hinge plate 25 can be seen, which was covered in Figure 1 by the hinge plate 23 and the see between the second handle member 5 and the associated function end 11 is arranged. In the joint 7, the hinge plates 23 and 25 touch each other in the region of a contact plane 27. FIG. 2 clearly shows that this is not arranged centrally between the upper side 29 and the lower side 31 of the joint 7. In other words, the hinge plate 23 is thinner than the hinge plate 25. The contact plane 27 is closer to the bottom 31 of the hinge 7 and thus closer to the cutting section 17th

Figure 3 shows the front end of the forceps 1 in a perspective view obliquely from the front, the observer faces the underside of the joint 7. The pliers 1 is shown here in the open state. It is thus clearly evident that the hinge plate 23 is thinner than the hinge plate 25, so the contact plane 27 is arranged closer to the lower side 31 than to the upper side 29 of the joint.

In the case of the combination pliers according to FIGS. 1 to 3, the cutting section 17 is arranged in a plane in which the underside 31 of the joint 7 is also located. Due to the chamfering of the blades 13 and 15, the active cutting edges of the blades may possibly lie in a plane which is located at a small distance from the plane in which the bottom 31 of the hinge 7 lies. The two levels are arranged parallel to each other.

In the figures 4 to 6 a modified embodiment of the forceps 1 is shown. This is not a combination pliers, as shown in Figures 1 to 3, but a side cutter whose configuration is basically known. Therefore, it will be discussed here only briefly. The same and functionally identical parts are provided with the same reference numerals, so reference is made to the description of Figures 1 to 3.

The pliers 1 'has a first gripping element 3, which is pivotably connected via a hinge 7 with a second gripping element 5. The pivot axis of the joint 7 is also perpendicular to the image plane of Figure 4. On the side facing away from the hinge 7 of the first handle member 7, a first functional element 9 is provided. Accordingly, the second handle element 5 is assigned a second functional end 11.

The function ends 9 and 11 have cutting edges 13 and 15, so that here too a cutting section 17 is formed. The two gripping sections, as used in the combination pliers according to FIG. ren 1 to 3 are provided, accounts for the trained as a side cutter pliers 1 '.

It can be seen from the side view of the front end of the forceps 1 'according to FIG. 5 that the hinge plate 23 associated with the first grip element 3 and the first functional end 9 is in turn thinner than the hinge plate 25 associated with the second grip element 5 and the second functional end 9. Therefore, the contact plane 27 between the two pivot plates 23 and 25 outside the center between the top 29 and the bottom 31 of the joint 7 is also arranged here. From Figure 5 it is clear that the cutting portion 17 extends at an angle to the contact plane 27, which is arranged parallel to the top 29 and bottom 31 of the joint.

The point of intersection 33 between the contact plane 27 and the cutting section 17 depends on the thickness of the hinge plate 23: the thinner it is, the closer the contact plane 27 is to the underside 31 of the joint 7, the closer this intersection point 33 is to the joint 7.

The front perspective view of the forceps 1 ', which is shown in Figures 4 and 5, once again clearly shows that the contact plane 27 between the joint plates 23 and 25 is closer to the bottom 31 than to the top 29 of the joint 7. One can also see that the cutting portion 17 of the forceps 1 ¹ formed as a side cutter is located at an angle to the plane of contact 27 and to a plane in which also the bottom surface 31 of the joint 7 is arranged. Accordingly, the cutting section 17 is of course also inclined to a plane in which the upper side 29 of the joint 7 is located. The angle of inclination is designated α in FIG.

It is clear from FIGS. 1 to 6 that the two gripping elements 3 and 5 of the pliers 1 and 1 'are connected together in a joint 7 and attached to joint plates 23 and 25. Respectively on the opposite side of the joint 7, the function ends 9 and 11 of the handle elements 3 and 5 are provided. In this case, the gripping elements 3 and 5, the associated hinge plates 23 and 25 and the functional elements 9 and 11 assigned to the gripping elements 3 and 5 are preferably integrally formed. It is essential here that the contact plane 27 between the joint plates 23 and 25 is not arranged in the middle between the top 29 and the bottom 31 of the joint 7, but rather off-center: It is preferably, as in Figures 2 and 3 and 5 and 6, moved in the direction of the bottom 31 of the hinge 7, ie in the direction of the cutting portion 17 of the pliers 1 and 1 ^1st This particular embodiment of the joint 7 ensures that when cutting objects in the cutting section 17 of the pliers 1, 1 'only a very small tilting moment is built and the two cutting edges 13 and 15 of the function ends 9 and 11 remain aligned with each other and an optimal Have cutting function. The items are not squeezed off but cut clean, so that the cutting forces are significantly reduced. Also, the friction forces between the joint plates 23 and 25 are reduced in the area of the contact plane 27, so that the forceps 1, 1 'is much easier to handle when cutting objects and the forces to be introduced into the grip elements 3 and 5 are substantially reduced. If the cutting section 17 is arranged inclined with respect to the contact plane 27 in the case of a pliers 1 \ as illustrated in FIGS. 4, 5 and 6, the inclination angle α of the cutting section 17 and the thickness of the hinge plates 23 and 25 can be Touch plane 27 are placed so that the intersection 33 between the contact plane 27 and cutting section 17 is as close as possible to the joint 7, preferably seen in the first third of the cutting portion 17 from the joint 7. As a result, the tilting moments occurring when cutting objects can be reduced to a minimum, as can the friction forces acting between the joint plates 23 and 25 in the region of the contact plane 27.

Overall, it can be seen that the joint 7 of the pliers 1, 1 "is only insignificantly changed in its basic construction: when the gripping elements 3 and 5 are produced with the associated functional ends 9 and 11, the corresponding hinge plates 23 and 25 are formed differently thick, wherein the hinge plate 23 is thinner than the hinge plate 25 so that the contact plane 27 between these hinge plates 23 and 25 is closer to the bottom 31 of the hinge 7. Such a modification of the hinge 7 is negligible for the manufacturing process of the pliers 1, 1 ' the production costs practically do not change and the production of the two pliers types 1 and 1 'remains virtually unchanged.

It is readily apparent that the forceps can also be formed as a so-called forceps, in which the pivot axis of the joint 7 is particularly close to the cutting edges 13 and 15 and the cutting portion 17.

Claims

claims

1. pliers with

two handle elements (3,5), which through

a joint (7) are pivotally connected to one another about a pivot axis,

with two handle elements (3,5) associated function ends (9,11), respectively

a cutting edge (13,15) and thus form a cutting portion (17), wherein

- The handle elements (3,5) via a hinge plate (23,25) with their function ends (9,11) are connected and wherein

the hinge plates (23, 25) each lie in a plane on which the pivot axis of the joint (7) is perpendicular,

characterized in that

- The contact plane (27) of the hinge plate (23,25) outside the measured in the direction of the pivot axis of the joint (7) center of the joint (7).

2. Pliers according to claim 1, characterized in that the cutting portion (17) with the contact plane (27) forms an angle (α).

3. Pliers according to claim 1 or 2, characterized in that the contact plane intersects the cutting portion (17) in an intersection (33), preferably in an area which faces the joint (7).

4. Pliers according to claim 3, characterized in that seen from the joint (7) from the intersection (33) in the first third of the cutting portion (17) is arranged.

5. Pliers according to one of claims 1 to 4, characterized in that the pliers (1) is designed as a combination, Flachrund- or flat-nose pliers.

6. Pliers according to one of claims 1 to 4, characterized in that the pliers (1 ') is designed as a side cutter.