EP2076361A2

EP2076361A2 - Tongs

Info

Publication number: EP2076361A2
Application number: EP07729488A
Authority: EP
Inventors: Wolfgang Lorbach
Original assignee: Knipex Werk C Gustav Putsch KG
Current assignee: Knipex Werk C Gustav Putsch KG
Priority date: 2006-05-24
Filing date: 2007-05-24
Publication date: 2009-07-08
Anticipated expiration: 2027-05-24
Also published as: US20090165602A1; DE102006024296A1; WO2007135190A3; PL2076361T3; WO2007135190A2; ES2385503T3; CN101495273B; US8087327B2; CN101495273A; EP2076361B1

Abstract

The invention relates to a pair of tongs (1) with two tong limbs (2, 3) which are connected rotatably to each other in a joint in which they are inserted and which has an axially fixed joint pin (7), wherein the tong limbs (2, 3) are only rotatable with respect to each other, and a working region (4) and a handle region (5) are formed in each case on one tong limb (2, 3), and a receiving tong limb (3) is designed with an insertion slot (6) which has a slot width (s) in the region of the joint and through which the other inserted tong limb (2) is inserted, wherein, furthermore, the working regions (4) of the tong limbs (2, 3) have a greater width (b), at least in part, than the slot width (s). In order to make production economic with the stability being as good as possible, the invention proposes that the handle region (5) of the inserted tong limb (2) has a width (B) and, if appropriate, a thickness which corresponds to the slot width (s). With regard to great freedom in the geometrical design of a handle limb, the invention also proposes that the handle covering has a reinforcing element.

Description

tongs

The invention relates to a pair of forceps with two forceps arms, which are rotatably connected to each other in a pushed through, having an axially fixed pivot pin, wherein the forceps arms are mutually only pivotable and on a pliers leg each a work area and a handle portion is formed and a receiving pliers legs with a formed in the hinge region a slot width having through-slot, through which the other inserted pliers legs is inserted, wherein moreover the working areas of the pliers legs at least partially have a greater width than corresponds to the slot width.

Such pliers are known in various embodiments. Especially as side cutters, center cutters, front or diagonal cutters but also as eg round nose pliers with or without cutting edge. The latter, with a cutting edge, are also known as stork tongs or radio tongs. The pliers involved here with inserted joint (or also: trade) are particularly needed when it comes to the application of high forces.

Traditionally, such a pair of pliers is produced by plastically deforming the receiving pliers limb in the region of the through-slot, with heating, and inserting the other pliers limb. Thereafter, a plastic recovery is performed again, so that the pushed-through pliers leg due to the wider work area and the conventionally wider grip area in the receiving pliers leg - without it arrives so far on the pivot pin - is trapped. This procedure is complicated and is also unfavorable in terms of choice of material. In particular, it limits the selection itself desired quenched steels. In addition, you can not always achieve the desired precision in the joint area.

To remedy this situation, it has already been proposed, cf. US-PS 4,418,868, to form on the receiving pliers legs no slot, but one by a small plate, which is suitably fixed immediately by means of the pivot pin, to be closed complete recess. Although this makes it possible to produce such a pliers without the aforementioned plastic deformations. On the other hand, however, it is no longer the desired material-uniform connection in the industry above and below the plugged-through

Pliers leg given. In addition, this known pliers consists of one part more, which is already a significant disadvantage in such high-volume products.

Based on the above-described prior art, the invention has the object to provide a pliers with inserted joint, which is also rationally produced at unchanged stability as possible advantages and imposed the least possible restriction in the selection of materials.

This object is achieved first and foremost in the subject matter of claim 1, wherein it is based on the fact that the grip region of the inserted pincer leg has a width and possibly a thickness which corresponds to the slot width. With the width of the pliers leg in this case the dimension in the height direction of the insertion slot is addressed, and with the thickness of the pliers leg according to the dimension in the longitudinal direction of the insertion slot, or in the longitudinal direction of the insertion slot having pliers legs. According to the invention it has been recognized that, although the working range of such pliers usually has a greater width (and optionally also: thickness), as it has the Slot width corresponds. Not the handle area. Here missing width (and possibly also: thickness) can, if desired, be compensated appropriately. Heating is no longer required for mounting this pliers. Likewise no plastic deformation. Nevertheless, the pliers limb having the through-slot is furthermore formed integrally, uniformly throughout the material, on both sides of the inserted pliers limb. Both the working area and the grip area are formed of the same material as the forked area forming the through-slot. The dimensions (width but also thickness) of the receiving as well as the inserted forceps leg can be selected in the joint area as with a conventionally designed pliers. In this respect, there is no difference in terms of stability. Because this is the most polluted area. It can even be chosen with regard to the stresses cheaper materials. The inserted forceps limb is no longer caught in the receiving forceps limb due to its geometry alone (without consideration of the pivot pin). The pushed-through pliers limb is held in the direction of insertion only by means of the pivot pin in the receiving pliers limb. On the other hand, transverse to the push-through direction, as a result of the joining together of the pliers limbs, the guiding of the components to one another is immediately given.

The features explained below with respect to the formulated further claims may also each be of independent significance.

The inserted pincers leg can have over its entire length the same, the slot width corresponding width. The slot width itself is also preferably the same over the entire length of the slot. In contrast, the width of the forceps leg but also outside the trade can be easily lower. It is also quite possible outside the trade bes a greater width when between the trade and the greater width of a functional area is formed, which allows for a first pass through a twisting. In the functional area, the thickness corresponds to the slot width in the hinge area.

The thickness of the grip region can also be selected to be smaller than the slot width (free dimension of the slot perpendicular to its longitudinal direction, that is to say perpendicular to the longitudinal extension of the forceps limb).

It is furthermore preferred that the grip area is in each case encompassed by a handle cover. For this purpose, the handle cover usually has a handle portion of the pliers leg receiving handle opening, which is preferably designed as a blind opening. The handle cover may be formed in particular as a plastic injection molded part. It is also preferred that the handle cover has a reinforcing element. The reinforcing element may be elongated and formed or arranged extending in the longitudinal direction of the handle cover.

In particular, the reinforcing element may be a metal part, preferably a flat part. The reinforcing element can be held by encapsulation in the Griffhül- Ie. In this case, it is not necessary for the reinforcing element to be encompassed on its entire circumference (even if only over a certain portion of its length) by plastic. It is sufficient if it is covered only on one side or in addition by penetrating bulges or holes of the metal part of plastic. Because it only has to be ensured that the metal part is sufficiently mounted for attachment (if necessary: under heating) of the handle cover on the grip area in the handle cover. Thereafter, provision can be made that it is already trapped by the spatial conditions. This in particular by a positive enclosure - in the longitudinal direction - of the reinforcing element by the plastic of Griffhül- Ie. It is also preferred that in the handle cover two with respect to the insertion of the handle cover opposite reinforcing elements are provided. These can face each other freely, so that they are, applied to the forceps limb, directly adjacent to the (metallic) pliers limb.

Although not required for the basic design, it may nevertheless be preferred that both pliers limbs - facing away from the hinge area and the working area - are designed with the same gripping areas, with regard to their geometric design. Then it is not necessary, for example, to equip the pliers legs with different gripping sleeves. The receiving pliers limb can also be reduced outside the joint region and in the region covered by the grip shell to a thickness which corresponds to that of the inserted pliers limb in this region. Regardless of a handle cover of the inserted pliers legs in the area in question, or only instead of their inclusion in the handle cover by strip parts, they are riveted, snapped or welded, for example, be reinforced. In this case, the same handle covers (and then preferably without reinforcing elements) can then be used for both pliers legs.

The through-slot is preferably formed over its length with the same, or at least substantially the same, continuous width.

This is usually achieved by a milling process by means of a flat milling cutter. Substantially equal width here means that it can also be slightly tapered, as far as is also fundamentally customary, in order to achieve a clamping effect in the region of maximum opening. The invention also provides a handle cover for a pliers leg, wherein the handle cover has an insertion opening for receiving a gripping area of the pliers leg.

In a variety of pliers, the pliers legs are added in a separate handle cover. In this respect, one also knows grip sleeves applied by dipping methods. These have no relevant inherent stability. By contrast, the gripping sleeves produced in the plastic injection process are generally regarded as relatively rigid bodies, which are then pushed onto the gripping area of a gripper leg. In principle, a direct encapsulation of a forceps leg is possible.

It is essential that in the course of use, the gripping areas of the pliers legs do not "dig in" the plastic or otherwise expands or loosens the gripping sheaths.For this purpose, it is generally provided that the gripping areas of the pliers legs are designed with such sufficient dimensions are that the resulting surface pressure in the abutment region of a forceps leg to the inner surface of the insertion of the handle shell remains in tolerable for the plastic material limits.

On the other hand, this considerably restricts the design of the - metallic - gripping legs of the pliers legs.

The invention also has the object of specifying a handle cover for a pliers leg, which offers greater freedom of design in the geometric design of a grip leg of a pliers limb.

This object is achieved first and foremost by the subject-matter of claim 11, whereby it is pointed out that the handle cover forms an amplifier. has kung element. The reinforcing element is preferably not formed from a plastic, although it may in principle also be formed from a plastic, for example a duroplastic hard plastic. Rather, it is preferably formed from a metallic material.

The fact that a reinforcing element is provided, improvements can be achieved in the crucial interaction region of the handle shell and pliers legs. The pliers limb can namely be designed with smaller geometrical dimensions, which are adapted to the material properties of the reinforcing element. As a result, for example, larger surface pressures can be allowed.

The features of such a handle cover further described below, which are contained in the further claims, may also be significant in their independent formulation.

Thus, it is preferable that the reinforcing member is elongated and arranged extending in the gripping sheath longitudinal direction. It corresponds in its extension thus the grip area of the forceps leg. It is preferably provided in each case in the width of the pliers limb, but can also go beyond that. The reinforcing element may be formed in particular as a flat part. It can be held by molding in the handle cover. Also can be provided with respect to the insertion opposite arranged reinforcing elements. In the following, reference is also made to the details of such a handle cover described earlier in connection with the pliers.

In the following, the invention will be explained further with reference to the attached drawing, which, however, represents only exemplary embodiments. This shows. 1 shows a perspective view of two pliers legs to form a pair of pliers with durchgedecktem joint.

2 shows a - with respect to the handle sections unclothed - pliers with durchgedecktem joint;

3 shows the pliers according to FIG. 2 with plugged-on gripping sleeves, in a plan view; FIG.

FIG. 4 shows the pliers according to FIG. 3 in a side view, seen against the gripping limb of the inserted forceps limb; FIG.

5 shows a cross section through a handle cover;

Fig. 6 shows a cross section through the article according to Fig. 5, taken along the line VI-VI.

1 and 2, pliers 1 with two pliers legs 2, 3 are shown and described. Pliers legs 2, 3 each have a working area 4 and a gripping area 5. In the embodiment of the work area is designed according to a side cutter pliers.

The receiving pliers leg 3 further has a through slot 6, through which the handle portion 5 of the inserted forceps leg 2 in the assembled state, see. Fig. 2, is inserted therethrough. The length L of the through-slot 6 (see, for example, FIG. 2) corresponds to approximately 3 to 10 times, preferably 4 to 8 times, more preferably approximately 5 times the slot width s. The work areas 4 of each pair of pliers have a greater width b over part of their length than corresponds to the slot width s of the through-slot 6. In contrast, in the tip region, the width is smaller in the usual way, just ending in a tip, than the slot width s.

By contrast, the grip region 5 of the inserted forceps limb 2 has a width B along its entire length, up to and adjacent to the working region 4, which corresponds to the width s. Or at least the width s does not exceed. As can be seen from FIG. 2, the pliers limb 2 can therefore be inserted into the pliers limb 3 without any widening of the push-through slot 6 and, in the inserted state, be connected to the receiving pliers limb 3 by means of a hinge pin designed as a hinge rivet 7 , In this respect, it may, for example, also be a screw.

In Figs. 3 and 4, the pliers 1 is completed with grips 8, 9 shown.

While the gripping regions of the pliers limbs 2, 3 according to the embodiment described here have different thicknesses B, the outer thickness A of the pliers limbs 2, 3 provided with the gripping sheaths 8, 9 is the same. The unequal thickness B of the gripping regions of the forceps arms is compensated by the gripping sheaths 8, 9. Specifically, in that in the embodiment, the handle cover 8, see. Fig. 4, the inserted forceps leg is formed with a respect to their corresponding width h smaller handle opening 10.

Since the dimension of the pushed-through pliers limb extending in the slot direction may well correspond to the usual dimension, and the substantial load when using pliers is achieved in this direction. In principle, there is no need to take other measures with regard to the handle cover 8 than simply forming the insertion opening 10 with a smaller width corresponding to the width B than with the handle cover 9. However, in order to counteract, if necessary, an easier bendability in a direction of stress perpendicular thereto , It is preferred in the handle cover 8 reinforcing elements 11, 12, see. Fig. 5, to order. These are in the exemplary embodiment to metallic flat parts, which are arranged opposite to the insertion opening 10 and each have two holes 13, 14. In these holes can plastic material of the injection molding process produced in plastic handle 8 penetrate and so, optionally in addition to a Randumgriff in the transverse direction, cf. Fig. 6, the reinforcing elements support.

The reinforcing elements can be inserted directly into the injection mold and be encapsulated accordingly.

If one also wants to prevent a possibly deviating bending resistance (compared to the unchanged gripping area of the receiving pliers limb) when subjected to stress in the slot plane of the slot (the usual stress), it is also recommended between the reinforcing elements and the gripping area of the inserted pliers limb to produce a bend-resistant connection, such as by Verzapfung.

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. pliers (1) with two pliers limbs (2, 3) which are rotatably connected to one another in a pushed through, an axially fixed pivot pin (7), wherein the pliers limbs (2, 3,

3) are only pivotable relative to one another and a work area (4) and a gripping area (5) are formed on a pliers limb (2, 3) and a receiving pliers limb (3) with a push-through slot (8) in the joint area (FIG. 6) is formed, through which the other pushed through

Moreover, the work areas (4) of the pliers legs (2, 3) at least partially have a greater width (b) than corresponds to the slot width (s), characterized in that the grip area (5) of passed through pliers leg (2) has a width (B) and optionally a thickness which corresponds to the slot width (s).

2. Pliers according to claim 1 or in particular according thereto, characterized in that the slot width (s) corresponding thickness is formed only over a portion of the length of the handle portion.

3. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the grip region (5) in each case by a handle opening (10) having handle - cover (8, 9) is included.

4. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the handle cover (8, 9) is designed as a plastic injection-molded part.

5. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the handle cover (8, 9) has a reinforcing element (11, 12).

6. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the reinforcing element (11, 12) is elongate and in the longitudinal direction of the handle cover (8, 9) is formed extending.

7. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the reinforcing element (11) is a metal part.

8. forceps according to one or more of the preceding claims or in particular according thereto, characterized in that the reinforcing element (11) by encapsulation in the handle shell (8, 9) is supported.

9. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that in the

Handle cover (8, 9) two with respect to the insertion opening (10) in which the handle portion of the forceps leg (2, 3) is received, opposite reinforcing elements (11) are provided.

10. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that both pliers legs (2, 3) are formed with the same grip areas (5).

11. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the Durch- Plug slot (6) is formed with a same width over its length.

12. Pliers according to one or more of the preceding claims or in particular according thereto, characterized in that the length

(L) of the through-slot (6) corresponds to 3 to 10 times the slot width (s).

13. In the plastic injection-molded handle cover (8, 9) for a pliers leg (2, 3), wherein the handle cover (8, 9) has an insertion opening (10) for receiving a handle portion (5) of the pliers limb (2, 3) characterized characterized in that the handle cover (8, 9) has a reinforcing element (11).

14. Handle cover according to claim 11 or in particular according thereto, characterized in that the reinforcing element (11) is elongate and is arranged to extend in the handle cover longitudinal direction.

15. Handle cover according to one or more of the preceding claims or in particular according thereto, characterized in that the reinforcing element (11) is a metal part.

16. Handle cover according to one or more of the preceding claims or in particular according thereto, characterized in that the reinforcing element (11) is held by encapsulation in the handle cover (8, 9).

17. Handle casing according to one or more of the preceding claims or in particular according thereto, characterized in that in the Handle shell (8, 9) has two with respect to the insertion opening (10) arranged opposite reinforcing elements (11).