EP1080845B1 - Pliers - Google Patents

Abstract

The tongs include a first work jaw (1) firmly coupled to a first tong handle (2). A second jaw is swivelable fitted on the first work jaw. The rear end section (23) is hinged with a second tong handle (4). Between the two jaws is a coupler (7a) forming a toggle lever. On the front end of the second tong handle is fitted a locking pawl, preventing spreading of the tong handles prior to reaching their closed position, such that the pawl engages a tooth line (47) for this purpose. The tooth line is formed on second work jaw.

Description

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

Such pliers are already known from US 5,842,371. This well-known Tongs contain a first work jaw and one with this firmly connected first pliers handle, one on the first work jaw pivoted second work jaws, a second plier handle, the section of the second pointing towards the rear end of the pliers Work jaw is attached, a link between the first and second pliers handle to form a knee lever, and one on the front Prevent pawl located at the end of the second plier handle spreading the pliers handles before they reach their closed position have, for this purpose the pawl in a row of teeth attacks.

This row of teeth is at the bottom of conventional pliers End of the link, with the row of teeth coaxial with the hinge point arranged between the link and the second pliers handle is.

To ensure secure locking even with very large forceps jaws the pliers by the pawl must ensure the teeth of the Row of teeth are relatively stable. Is a certain number of teeth given the row of teeth, the row of teeth must be in a relatively large Distance from the aforementioned hinge point. This leads to, that the second plier handle, which holds the row of teeth and pawl, must be relatively large, which is a little compact Pliers leads. Reducing the size of the second pliers handle would increase the risk inherent in exposing parts of the row of teeth and pawl what would increase the risk of injury.

One row of teeth at the front end of the second handle is already known from DE-U-296 19 451.

The invention has for its object a pair of pliers of the type mentioned to be more compact in the grip area.

The solution to the problem is in the characterizing part of the claim 1 specified. Advantageous embodiments of the invention are can be found in the subclaims.

A pair of pliers according to the invention, according to the preamble of the claim 1 is formed, characterized in that the second Working jaws two in the pliers plane at a distance from each other and to has rear leg pointing legs, of which the one Row of teeth that is closer to the first work jaw.

According to the invention, the row of teeth in which the pawl engages from the area of the pliers handles to the area of the work jaws led because there is more space to accommodate the row of teeth is. The pliers can thus be made more compact in the grip area. Due to the available space, with a predetermined number of teeth the teeth are also made relatively large or stable, so that a more secure Locking operation of the pliers is guaranteed.

A work jaw designed in this way initially creates a relatively large amount of space along the length of the leg to form the row of teeth placed so that the row of teeth with a given number of teeth also can be made relatively stable. On the other hand, such a work jaw only a very light weight due to the space between the legs remains and material is clamped in this way. The row of teeth comes preferably coaxially to the second work jaws and the articulation point connecting the second pliers handle to lie what Manufacture and positioning of pawl and row of teeth simplified.

According to another advantageous development, the row of teeth lies against that Side of said leg, which is opposite the other leg, the pawl being pivoted on the second plier handle is stored, is stored between these legs.

The pawl can thus within the second work jaw be accommodated so that there is also space in the area of the work jaws can be saved, which leads to an even more compact pliers.

A tension spring for pretensioning the pawl is in its zero position between this and that end of the link at which the hinge point mentioned above is located. This can be done in the second grip at least one opening for unlocking the pawl is available if the pliers handles have not yet reached their closed position to have.

According to a very advantageous embodiment of the invention, the two are Leg parts of a U-shaped central node element the pliers.

This central node element of the pliers takes over several at the same time Tasks and can be easily manufactured, which has a positive impact on manufacturing costs of the entire forceps.

Not only is the aforementioned row of teeth provided on the central node element. Rather, it is also the point of articulation between the second work jaw and a second plier handle arranged at the free end of that leg, opposite the row of teeth. For this purpose there is one Through hole for receiving a corresponding hinge axis intended.

On the other hand, on both sides of the central node element protruding plates protruding to form a jaw appropriate. For this purpose, the central node element is again with appropriate through holes for receiving Provide screws or fastening axes.

The central node element also has a through hole for receiving a pivot axis around the central node element and jaws existing second work jaws on the first work jaw to be able to pivot.

Last but not least, there are brackets for one on the central node element Return spring provided by which the pliers open automatically after the pliers handles have reached their closed position.

The central node element is therefore a multifunctional element within The pliers contain and simplify their manufacture considerably. So can the central node element be plate-shaped, what their Manufacturing facilitated. The teeth of the tooth row mentioned can extend over the entire plate thickness, so that a secure locking effect is achieved with the aid of the pawl if this is designed accordingly thick. The plate-shaped node element can be assembled from several individual panels be that can be produced as stamped parts, which is the manufacture of the central Node element further simplified. In this case, the pawl also consist of a pair of pawls, one each engages in a row of teeth on a single side plate.

Figur 1 eine Explosionsdarstellung einer erfindungsgemäßen Zange nach einem ersten Ausführungsbeispiel;

Figur 2 eine Seitenansicht der Zange nach Figur 1 bei abgenommenen Seitenplatten;

Figur 3 eine perspektivische Ansicht der Zange nach Figur 1 im zusammengebauten Zustand;

Figur 4 ein zweites Ausführungsbeispiel der erfindungsgemäßen Zange;

Figur 5 eine Seitenansicht der Zange nach dem zweiten Ausführungsbeispiel bei abgenommenen Seitenplatten und in geöffnetem Zustand; und

Figur 6 die Zange nach Figur 5 in geschlossenem Zustand.

Embodiments of the invention are described in detail below with reference to the drawing. Show it:

Figure 1 is an exploded view of a pliers according to the invention according to a first embodiment;

FIG. 2 shows a side view of the pliers according to FIG. 1 with the side plates removed;

Figure 3 is a perspective view of the pliers of Figure 1 in the assembled state;

Figure 4 shows a second embodiment of the pliers according to the invention;

Figure 5 is a side view of the pliers according to the second embodiment with the side plates removed and in the open state; and

6 the pliers according to FIG. 5 in the closed state.

First of all, the structure should be based on the exploded view of FIG the pliers according to the invention according to the first embodiment are explained.

The pliers according to FIG. 1 essentially consist of a first working jaw 1, a first pliers handle 2, a second work jaw 3, one second plier handle 4 and a relatively rigid link 7a.

The first work jaw 1 and the first pliers handle 2 are in one piece with one another connected. This unit consists of two parallel to each other lying sheets 8 and 9, the spacers 10, 11 and 12 on Be kept clear. Through the sheets 8 and 9 and the spacers 10, 11 and 12 bolts 13, 14 and 15 pass through them, the plates 8 and 9 stick together. The sheets 8 and 9 are in the front area of the pliers except to form a jaw 16.

The second plier handle 4 also consists of two parallel to each other Sheets 17 and 18, the spacers 19 and 20 at a distance are held to each other. Through the sheets 17 and 18 and the spacers 19 and 20 bolts 21 and 22 pass through to the sheets 17 and 18 hold together.

The second work jaw 3 is shown in the central area of FIG. 1. He contains two parallel clamping jaw plates 25 and 26, on opposite sides of a central node element 27 are arranged. The central node element 27 is U-shaped formed and has two legs pointing to the rear end of the pliers on. The two jaw plates 25 and 26 are in the area of the base and one leg of the central node element 27 by means of Screws 28 and bolts 29 fastened and stand towards the front Pliers end from the base of the central node element 27. in the free end area, the jaw plates 25 and 26 form a jaw, which comes to rest on the lower side of the jaws 16.

The two legs of the central node element 27 are S1 and S2 designated. At the rear section 23 of the second work jaw 3, that is at the free end of the leg S2, the second plier handle 4 is pivotable stored. An axis 24 shown in FIG. 2, which has a through opening, is used for this purpose 46 interspersed in the rear section 23 and in through openings 51 rests, which is in both sheets 17 and 18 of the second pliers handle 4 are located.

The second work jaw 3 itself is about a pivot axis 30, which is shown in FIG 2 is shown, stored in the lower region of the first work jaw 1. For this purpose there is a circular one in each of the sheets 8 and 9 Through opening 33a is provided which receives the pivot axis 30. This sits on this pivot axis 30 and between the sheets 8 and 9 central node element 27, wherein the pivot axis 30 by a Through opening 32 passes through, which is located at the base of the central Node element 27 or at the foot of the leg S1.

The connecting member 7a consists of two spaced parallel to each other Sheets 34a and 35a. These two sheets 34a and 35a have a passage opening 34c, 35c in each case in its lower region through which a common axis 36 passes. This axis 36 can be seen in Figure 2 and rests with its ends in through openings 52, which is in the front area of the sheets 17, 18 of the second pliers handle 4 are located. The through openings 52 are opposite to the Through openings 51 moved to the rear end of the pliers.

At the other end are the plates 34a and 35a of the link 7a pivoted on the first pliers handle 2. You rest here on a concentric mounted axle 37, which has stub axles 38 on both sides, which rest in corresponding recesses in the plates 8 and 9. The axes the stub axle 38 are offset from the axis 37. On one of the stub axles 38 sits an adjusting plate 39 with lateral side unspecified Recesses that serve to receive a screw 40, which can be screwed into the sheet 8. The screw 40 is loosened and the adjusting screw 39 rotated, so the length of the Adjust link 7a and thus the pliers in the area of the pliers mouth 16 adjust. After reaching the end position of the adjusting disc 39 is the screw 40, which is then in a correspondingly different lateral Recess of the adjusting plate 39 comes to rest, tightened again and thus fixed the system.

The structure of the central node element 27 in FIG. 1 is shown below are explained in more detail. This central node element 27 is essentially U-shaped and has two protruding towards the rear end of the pliers Leg S1 and S2 on. The central node element 27 from a middle plate 41 that is not quite the end of the leg S 1 reached. This middle plate 41 can be made of plastic, for example be made. Is located on both sides of the middle plate 41 an outer plate 42 and 43. These outer plates 42 and 43 are made made of metal. All plates 41, 42 and 43 can by one Stamping process are produced and are then placed on top of each other and screwed, what the screw 28 is used for. A positioning of the Plates 41, 42 and 43 relative to one another also take place via the bolts 29, which enforce these plates and plates 25 and 26 and with the help are held in the system by circlips.

On the inside of leg S1, i.e. on the side that corresponds to the section 23 is facing, there is a row of teeth 47. The row of teeth 47 is concentric with the through hole 46, the teeth the row of teeth 47 are both in the plate 42 and in the plate 43.

In contrast, between the legs S1 and S2 and the row of teeth 47 is opposite a pawl 48 is positioned, which is best shown in Figure 2 can be seen. This pawl 48 is pivotally mounted about an axis 49, in the front area of the second pliers handle 4 between the Sheets 17 and 18 are held and also concentric on a track is movable to axis 24. For this purpose, the sheets 17 and 18 expanded in the front area in their sheet metal level so that they the free

Ends of the legs S 1 and S2 with the row of teeth 47 and the through hole 46 between them. The axis 49 thus runs between the legs S1 and S2 through, so that the pawl 48 opposite the row of teeth 47 can be positioned. The pawl 48 is in the Area between axis 49 and row of teeth 47 longer than the distance between the row of teeth 47 and the axis 49. The pawl 48 stands engaged with the row of teeth 47 when the pliers handles 2 and 4 are closed or moved towards each other. The pawl 48 is in her width so far perpendicular to the plane of the pliers, that they engage with both rows of teeth 47 on the plates 42 and 43 comes. The pawl 48 can also by two parallel pawls be replaced, as already mentioned. It comes out of engagement with the Rows of teeth when pliers handles 2 and 4 reach their closed position to have. Then the upper stops 56 hit the plates 17 and 18 against the opposite lower edge of the plates 8 and 9.

Concentric to the axis 49 are in the sheets 17 and 18 of the second pliers handle 4 still longitudinal slots 50, through which manually the pawl 48 are brought out of engagement with the row of teeth 47 can, if this is necessary with pliers handles 2 and 4 not yet closed should be.

As best seen in Figure 2, the pawl 48 is by means of a tension spring 57 pulled into a zero position, which is only then actually is taken when the pawl 48 is out of engagement with the row of teeth 47 stands. If it is in engagement with the row of teeth 47, it can, for example give way when the jaws 16 close and not in reverse Direction. The tension spring is at one end on the Pawl 48 and with its other end at the lower portion of the link 7a attached. For this purpose, the tension spring grips with the last-mentioned end an axis 57a, which between the plates 34a and 35a runs. Via an approach existing on the pawl 48 58, which protrudes into the opening 50, the pawl 48 can be disengaged bring with the row of teeth 47.

Are located at the free end of the leg S1 of the central node element 27 lugs 53 still pointing towards the rear end of the pliers on the plates 42 and 43. These lugs 53 encompass one shown in FIG Axis 53a, to which one end of a tension spring 54 is connected, the then comes to lie between the plates 42 and 43. The other end the tension spring 54 is about an axis 55 lying between the plates 8 and 9 led around. The tension spring 54 is used after reaching the closed position the pliers handles 2 and 4 open the pliers again automatically.

It should also be mentioned that reference numerals 44 and 45 in FIGS and 2 openings on the working jaws 1 and 2 in the area of the jaws designate the machining elements on the work jaws Have 1 and 2 attached.

Figure 3 shows the pliers according to the invention according to the first embodiment in assembled condition with handles 59 and 60 on pliers handles 2 and 4.

Figures 4 to 6 show a second embodiment of the invention Pliers. The same elements as in Figures 1 to 3 are with the provided with the same reference numerals and will not be described again.

Deviating from the exemplary embodiment according to FIG. 1, the openings are here in the sheets 8 and 9 for receiving the pivot axis 30 as elongated holes 33b formed, the longitudinal direction in the sheets 8 and 9 and runs at least approximately perpendicular to the longitudinal direction of the pliers. On the outside of the two sheets 8 and 9 are two V, U or Ω-shaped sheet metal springs 5 and 6, one end of which Pivot axis 30 engages while the other end of the respective springs 5 and 6 engages around a bolt 31 which is fixed to the first work jaw 1 is arranged above and at a distance from the respective elongated hole 33b.

The connecting member 7b is also a spring or compression spring with a predetermined Spring characteristic curve formed. It contains the spring plates 34b and 35b parallel at a distance from each other and lies between the eccentrically mounted axis 37 and axis 36. Otherwise corresponds the structure of the second embodiment the structure of the first embodiment.

The spring characteristics of the spring plates 5 and 6 and the spring plates 34b and 35b are selected so that the work jaws during a first work path 1 and 3, over which the spring plates 5 and 6 are not yet against have driven the stop formed by the elongated hole 33b, the force curve in the jaw 16 essentially by the spring plates 5 and 6 is determined, however (to a small extent) supported by the spring plates 34b and 35b. After the maximum deflection path for the spring plates 5 and 6 is reached, the axis 33 against the end stop of the elongated holes 33b, the force curve in Forceps jaw 16 then only by the spring properties of the spring plates 34b and 35b determined. The characteristics of all spring plates are preferably then coordinated so that in the event of an attack the pivot axis 30 against the front edge of the elongated holes 33b gives a smooth transition. When a certain one is exceeded Limit force in the jaws and in the event that the spring plates 5 and 6 have already been driven against the stop, the actuator 7b then finally after, even if the jaws are not yet has been completely closed, the pliers handles 2 and 4 in the To be able to transfer the closed position. The way to work begins then when the tool elements come into contact with the one to be machined Subject have come.

Since depending on the load, the resilient connecting link 7b in its Angular position adjusted relative to the second pliers handle 4, it is also in this Embodiment advantageous, the row of teeth for the locking system not to be arranged on the connecting link 7b, since there would then be a risk that the pawl 48 is no longer in the desired manner with the Row of teeth would come into engagement. Instead, the row of teeth 47 is also located here on the second working jaw 3 or central node element 27, so that it is not influenced from the position of the pliers the relative position between the pawl axis 49 and row of teeth 47 always remains constant.

Claims (10)

1. Pliers having a first operating jaw (1) and a first plier handle (2) fixed thereto, having a second operating jaw (3) mounted pivotably on the first operating jaw (1), having a second plier handle (4) which is articulated on a section (23) of the second operating jaw (3), said section being oriented towards the rear plier end, having a connecting element (7a, 7b) between the first and second plier handles (2, 4) for the purpose of forming a toggle lever, and having a catch (48) which is arranged at the front end of the second plier handle (4) and is intended for preventing the plier handles (2, 4) from spreading apart before they have reached their closed position, the catch (48) engaging, for this purpose, in a row of teeth (47), characterized in that the second operating jaw (3) has two legs (S1, S2) which are spaced apart from one another in the plier plane, are oriented towards the rear plier end and of which the leg which is located closer to the first operating jaw (1) is the leg (S1) which bears the row of teeth (47).
2. Pliers according to Claim 1, characterized in that the row of teeth (47) is located coaxially with the point of articulation (24) connecting the second operating jaw (3) and the second plier handle (4) .
3. Pliers according to Claim 1 or 2, characterized in that the row of teeth (47) is located on that side of said leg (S1) which is located opposite the other leg (S2), and in that the catch (48) is mounted between said legs (S1, S2).
4. Pliers according to Claim 3, characterized in that a tension spring (57) for prestressing the catch (48) is located between the latter and the connecting element (7a, 7b).
5. Pliers according to one of Claims 1 to 4, characterized in that there is at least one opening (50) in the second plier handle (4) for the purpose of unlocking the catch (48).
6. Pliers according to one of Claims 1 to 5, characterized in that the two legs (S1, S2) are parts of a central junction element (27) designed in the form of a U.
7. Pliers according to Claim 6, characterized in that the point of articulation (24) between the second operating jaw (3) and the second plier handle (4) is arranged at the free end of that leg (S2) which is located opposite the row of teeth (47).
8. Pliers according to Claim 6 or 7, characterized in that the central junction element (27) is of platelike design and the teeth of the row of teeth (47) extend over the entire plate thickness.
9. Pliers according to Claim 8, characterized in that the central junction element (27) is assembled from a plurality of individual plates (42, 41, 43).
10. Pliers according to one of Claims 6 to 9. characterized in that plates (25, 26) projecting towards the front plier end are provided on both sides of the central junction element (27) for the purpose of forming a clamping jaw.

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