EP3100827B1 - Press lever assembly with a press lever and press jaws - Google Patents

Description

TECHNICAL AREA

The present invention relates to a press lever arrangement with a press lever and a press jaw according to the preamble of claim 1.

Such a press lever arrangement is off DE 297 17 314 U known.

STATE OF THE ART

Pressing tools for pressing pressing elements, in particular press fittings, pipes and sleeves, have become known from the prior art.

The DE 20 2011 101 995 shows a press tool with two press levers made of fiber composite material, with a press jaw being inserted into the respective press lever during curing. The press jaw is firmly connected to the press levers.

A disadvantage of the press tool DE 20 2011 101 995 is the connection between the press lever and the press jaw, which can be impaired during the pressing process.

DISCLOSURE OF THE INVENTION

Based on this prior art, it is an object of the present invention to specify a press lever which overcomes the disadvantages of the prior art. In particular, the same pressing quality should be achieved over several pressings. In addition, a press lever arrangement that is as wear-resistant as possible is to be specified.

This object is achieved by the press lever arrangement according to claim 1. Accordingly, a press lever arrangement comprises a press lever and a press jaw. The press lever has a press jaw receptacle with a receiving surface. The press jaw has a press surface that extends partially around a central axis and has a press contour and a receiving surface. The press jaw can be positioned with its receiving surface in the press jaw receptacle of the press lever. The press lever and press jaw are therefore connected to one another via the respective receptacle. The press lever arrangement further comprises at least one securing element which is arranged or designed in such a way that a relative displacement between the press jaw and the press jaw receptacle can be prevented. It is also conceivable to arrange two or at least two securing elements.

The press jaw is thus held in the press jaw receptacle by the securing element. Because of this fixed positioning, the quality of the individual crimps can be maintained.

The material of the press lever is tempered steel and the material of the press jaw is case-hardened steel. A particularly wear-resistant press lever arrangement can be provided by this choice of material. Furthermore, the optimal material can be used for each part of the press lever arrangement.

The pressing jaw and the pressing lever are two separate elements which are put together and secured to one another via the securing element.

The at least one securing element is preferably designed as a separate element for the press lever and for the press jaw. The at least one securing element can be connected to the press lever and / or the press jaw, so that a relative displacement between the press jaw and the press jaw holder can be prevented. As an alternative or in addition, the at least one securing element can also be part of the press lever and / or the press jaw.

Preferably, the at least one securing element is arranged such that a Displacement of the press jaw relative to the press jaw receptacle along the central axis and a displacement around the central axis can be prevented. The press jaw is fixed in position in the press jaw holder.

The receiving surface of the press jaw receptacle and the receiving surface of the press jaw preferably have the shape of a cylinder, in particular a half cylinder, which partially extends around the central axis. However, elliptical bearing surfaces or bearing surfaces made up of several sections, such as a hexagonal bearing surface, are also conceivable.

A substantially full-surface contact is preferably established between the receiving surface of the press jaw receptacle and the receiving surface of the press jaw. This means that the receiving surface are essentially congruent.

The receiving surfaces are in direct or indirect contact with one another, depending on the design of the securing element.

In a first preferred embodiment, the at least one securing element is at least one securing pin which is inserted into a bore that runs partially through the press jaw and partially through the press lever. More than one locking pin can particularly preferably also be used. In particular, two locking pins are preferably used at a distance from one another. For this purpose, two bores arranged at a distance from one another are provided.

The bore or the lateral surface of the locking pin preferably penetrates the two receiving surfaces in sections.

The central axis of the bore or the central axis of the locking pin preferably penetrates the two receiving surfaces in sections.

Said penetration of the bore or the central axis is such that the pressing contour is preferably not cut or remains unaffected by it. The at least one locking pin preferably runs transversely and at a distance from the central axis of the pressing surface. Alternatively, the at least one locking pin runs parallel to and at a distance from the central axis. A combined arrangement transverse and parallel to the central axis is also conceivable if several locking pins are present. The locking pin could also be oriented at an angle to the central axis.

In a second embodiment, the at least one securing element is an elevation which extends away from one of the receiving surfaces and which engages with a depression extending into the other receiving surface. There can be several elevations and several depressions. The elevation engages in the recess.

The elevation preferably extends away from the receiving surface of the press jaw receptacle and the recess extends into the receiving surface of the pressing jaw, the elevation or recess preferably being arranged in the end regions of said receiving surface.

The elevation or depression is preferably designed to run around the central axis and / or around the central axis.

The at least one elevation or the depression is preferably arranged in the corresponding edge regions of the receiving surface and thus forms a stop against a relative movement between the press jaw receptacle and the press jaw.

In a third embodiment, the at least one securing element is formed by the securing element according to the first embodiment and that according to the second embodiment. It is therefore a combined arrangement of the locking pin and the elevation. Particularly preferably, the securing pin is oriented transversely to said central axis and the elevation is oriented parallel to said central axis.

In a fourth embodiment, the securing element is a material connection between the press jaw receptacle and the press jaw, wherein the material connection is in particular a soldered connection and / or in particular a welded connection and / or in particular an adhesive connection.

In a further embodiment, the securing element is provided by the securing pin, the elevation and the material connection. In a further embodiment, the securing element is provided by the elevation and the material connection.

In a further embodiment, the securing element is provided by a force-fit connection between the pressing jaw and the pressing jaw holder, the securing element being provided in particular by inserting the pressing jaws by means of a heat sinking method.

This embodiment can also be combined with any other embodiment mentioned above. The combination of locking pin, elevation and insertion with the heat sink method is particularly preferred. The combination of heat reduction and mechanical fixation is particularly advantageous with regard to holding the press jaws in the press jaw holder.

In all the embodiments, the receiving surface of the press jaw receptacle is preferably essentially congruent with the receiving surface of the press jaw.

The press jaw is preferably designed as an interchangeable insert. This means that press jaws can be exchanged in the event of a defect and / or that press jaws with different press contours can be used in the same press lever. The receiving surface and the other features relating to the interface between the press jaw and press lever are identical among the different press jaws. However, the securing element is preferably designed in such a way that it can only be replaced in the event of maintenance and not in daily use.

Furthermore, the receiving surfaces preferably extend cylindrically around the said central axis of the pressing contour. In particular, the receiving surface extends in a circular-cylindrical manner around the central axis of the pressing contour.

A press tool comprises two press lever arrangements as described above, one press lever being pivotable about a first pivot axis and the other press lever pivotable about a second pivot axis from an initial position into a pressing position.

The two press levers are preferably mounted pivotably on at least one common support structure via their respective pivot axis.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine perspektivische Ansicht eines Presswerkzeuges mit zwei erfindungsgemässen Presshebelanordnungen;

Fig. 2

eine perspektivische Explosionsdarstellung einer Presshebelanordnung nach Figur 1;

Fig. 3

eine Schnittdarstellung der Presshebelanordnung nach einer der vorhergehenden Figuren;

Fig. 4

eine Detailansicht des Details IV von Figur 3; und

Fig. 5

die Schnittdarstellung nach Figur 3 mit entfernter Pressbacke.

Preferred embodiments of the invention are described below with reference to the drawings, which are only used for explanation and are not to be interpreted as restrictive. In the drawings show:

Fig. 1

a perspective view of a press tool with two press lever arrangements according to the invention;

Fig. 2

an exploded perspective view of a press lever assembly according to Figure 1 ;

Fig. 3

a sectional view of the press lever arrangement according to one of the preceding figures;

Fig. 4

a detailed view of the detail IV of Figure 3 ; and

Fig. 5

the sectional view according to Figure 3 with removed press jaw.

DESCRIPTION OF PREFERRED EMBODIMENTS

In the Figures 1 to 5 a preferred embodiment of the press lever arrangement 1 according to the invention is shown.

In the Figure 1 the press lever arrangement 1 is shown in combination with a press tool. The pressing tool here comprises two pressing lever arrangements 1 as described below. The one press lever is about a first pivot axis A1 and the other press lever can be pivoted about a second pivot axis A2 from a starting position into a pressing position. The two press levers are connected here via two support elements 13 arranged at a distance from one another. The press levers can be pivoted relative to the support elements 13.

The press lever assembly 1, as in Figures 1 and 2 shown, comprises a press lever 2 and a press jaw 3. The press lever 2 has a press jaw receptacle 4 with a receiving surface 5. The pressing jaw 3 can be inserted into this pressing jaw receptacle 4. The pressing jaw 3 in turn comprises a pressing surface 6, which extends partially around a central axis M, with a pressing contour 7 and a receiving surface 8. The pressing jaw 3 can be positioned with its receiving surface 8 in the pressing jaw receptacle 4 of the pressing lever 2. The receiving surface 8 of the pressing jaw 4 is in contact with the receiving surface 5 of the pressing jaw receptacle 4 of the pressing lever 2. The pressing contour 7 lies opposite the receiving surface 8 and is essentially concave, so that a part to be pressed, such as a fitting to be pressed, can be pressed through the pressing contour 7.

The press lever arrangement 1 further comprises at least one securing element 9 which is arranged or designed in such a way that a relative displacement between the press jaw 3 and the press jaw receptacle 4 can be prevented. With the securing element 9, the press jaw 3 is held in a fixed position in the press jaw receptacle 4 of the press lever 2.

The securing element 9 is preferably designed in such a way that the pressing jaw 3 is exchangeable, that is to say the pressing jaw 3 can be removed from the pressing jaw receptacle 4 and replaced by another pressing jaw 3. However, the securing element 9 is preferably designed in such a way that it can only be replaced in the case of maintenance and not in daily use.

The at least one securing element 9 is arranged in such a way that a displacement between the press jaw 3 and press jaw holder 4 along the central axis M and around the central axis M can be prevented. This means that the securing element 9 ensures that the pressing jaw 4 is immovably mounted in the pressing jaw holder 4.

Of the Figure 2 It can be clearly seen that the receiving surface 5 of the pressing jaw receptacle 4 and the receiving surface 8 of the pressing jaw 3 have the shape of a cylinder partially extending around the central axis M. The cylinder preferably has the cross section of part of a circular cylinder, that is to say the cylinder has a constant radius.

The receiving surface 5 of the pressing jaw receptacle 4 and the receiving surface 8 of the pressing jaw 3 are congruent or congruent with one another. The two receiving surfaces 5, 8 are particularly preferably in flat contact with one another.

In the present embodiment, the at least one securing element 9 is provided by a securing pin 9, an elevation 10 in cooperation with a recess 11 and the use of an optional heat sinking method when inserting the pressing jaw 3 into the pressing jaw receptacle 4. It is also conceivable to use other securing elements in combination with those mentioned or on their own or in another combination.

The individual securing elements 9, 10, 11 mentioned, which are shown in the figures, will now be explained in more detail below.

The securing pin 9 is inserted in a bore 12 which runs partly through the press jaw 3 and partly through the press lever 2. The bore 12 is designed in such a way that it extends in sections through the two receiving surfaces 5, 8. The bore 12 penetrates or intersects the two receiving surfaces 5, 8. The same can be said with regard to the lateral surface 14 of the locking pin 9. The lateral surface 14 of the securing pin 9 penetrates the two receiving surfaces 5, 8 in sections. Consequently, the securing pin 9 provides a stop with respect to a movement around the central axis M and along the central axis M between the pressing jaw 3 and the pressing jaw holder 4.

In the embodiment shown, two locking pins 9 and two bores 12 are shown in FIG which the locking pins 9 are inserted, available. The bores 12 are arranged at a distance from one another, as a result of which the locking pins 9 also come to lie at a distance from one another. The locking pins 9 are placed here transversely and at a distance from the central axis M of the pressing surface 6. As an alternative, the at least one locking pin 9 can also run parallel to and at a distance from the central axis M.

In the Figure 3 the sectional view is shown with the locking pin 9 inserted and in Figure 5 shown with the locking pin 9 removed. From these two figures it can also be seen that not only the bore 12 or the outer surface 14 of the locking pin 9 penetrates the two receiving surfaces 5, 8, but that the central axis M9 of the locking pin 9 also penetrates the two receiving surfaces 5, 8. As a result, the securing pin 9 penetrates equally well into the press jaw 3 and the press jaw holder 4, so that the connection between the two elements can be further improved.

Of the Figures 2 and 4th the elevation 10 and the depression 11 can be recognized well. In the embodiment shown, an elevation 10 at the respective ends of the receiving surface 5 extends away from the receiving surface 5 of the press jaw receptacle 4. The elevation 10 extends essentially in the direction of said central axis M. The recess 11 extends from the receiving surface 8 of the press jaw 3 into the receiving surface 8. In the present case, the recess 11 is arranged at the end of the respective receiving surface 8 and, in other words, forms a kind of extension of the receiving surface 8. The cooperation between the elevation 10 and recess 11 provides an additional securing element. The elevation 10 and recess 11 essentially ensure that the pressing jaw 3 cannot fall out of the pressing jaw receptacle 4 in the transverse direction to the central axis M.

The pairing of elevation 10 / recess 11 is preferably arranged on the edge regions of the receiving surfaces 5, 8, so that the force acting on the receiving surface is not impaired during the pressing process.

In the case of smaller pressing forces, a pairing of elevation 10 / depression 11 could also be arranged within the corresponding receiving surfaces. In alternative In embodiments, the pairing of elevation 10 / depression 11 could also extend circumferentially along the respective receiving surface 5, 8.

As explained above, the securing element is additionally provided by inserting the pressing jaw into the pressing jaw receptacle 4 by means of a heat sinking method. For this purpose, a temperature difference is produced between the press jaw 3 and the press jaw holder 4 such that the press jaw holder 4 can expand with respect to the press jaw 3. This is achieved, for example, by cooling the press jaw 3 or heating the press jaw holder 4. As a result, a small amount of play can be created between the press jaw 3 and the press jaw holder 4, which allows the press jaw 3 to be inserted into the press jaw holder 4. When the normal temperature is reached, the press jaw 4 then sits snugly in the press jaw receptacle 4.

The material of the press lever 2, in which the press jaw holder 4 is arranged, is a quenched and tempered steel with tough fracture behavior. The tempered steel could be 42CrMo4, for example. The material of the press jaw 3 is case-hardened steel or ceramic against wear. The case-hardening steel could be 18CrNiMo7-6, for example. In this way, an optimal pairing of materials can be achieved with regard to the various requirements.

Of the Figures 2 to 5 it can also be seen that the two pivot axes A1 and A2 are provided by a bore 12. Below the bore, that is, opposite the press jaw receptacle 4, the press lever 2 has a contact contour 15 via which a tool can act on the press lever 2.

REFERENCE LIST

1

Press lever arrangement

2

Press lever

3

Press jaw

4th

Press jaw holder

5

Recording area

6th

Pressing surface

7th

Press contour

8th

Recording area

9

Locking element, pin

10

Securing element, elevation

11

Securing element, recess

12

drilling

13

Support elements

14th

Outer surface

15th

Contact contour

A1

Swivel axis

A2

Swivel axis

M.

Central axis

M9

Central axis pin

Claims (14)

1. Pressing lever arrangement (1) comprising a pressing lever (2) and a pressing jaw (3), wherein the pressing lever (2) comprises a pressing jaw seat (4) with a receiving surface (5), and wherein the pressing jaw (3) comprises a pressing surface (6) extending partially around a center axis (M) with a pressing contour (7) and a receiving surface (8), wherein the pressing jaw (3) can be positioned with its receiving surface (8) in the pressing jaw seat (4) of the pressing lever (2),
   wherein the pressing lever arrangement (1) comprises at least one securing element (9; 10, 11) which is arranged or formed, respectively, such that a relative displacement between pressing jaw (3) and pressing jaw seat (4) preventable, characterized in that the material of the pressing lever is heat-treatable steel and that the material of the pressing jaw is case-hardened steel or ceramic.
2. Pressing lever arrangement (1) according to claim 1, characterized in that the at least one securing element (9; 10, 11) is arranged such that a displacement of the pressing jaw (3) with respect to the pressing jaw seat (4) along the center axis (M) and a displacement along the center axis (M) is preventable.
3. Pressing lever arrangement (1) according to claim 1 or 2, characterized in that the receiving surface (5) of the pressing jaw seat (4) and the receiving surface (8) of the pressing jaw (3) comprises the form of a cylinder partially extending around the center axis (M), in particular of a half cylinder.
4. Pressing lever arrangement (1) according to one of the preceding claims, characterized in that the at least one securing element (9) is a securing pin (9), which is inserted in a bore (12) partially extending through the pressing jaw (3) and partially through the pressing lever (2).
5. Pressing lever arrangement (1) according to claim 4, characterized in that the bore (12) or the circumferential surface (14) of the securing pin (9), respectively, penetrates the two receiving surfaces (5, 8) in sections.
6. Pressing lever arrangement (1) according to claim 4 or 5, characterized in that the center axis (M9) of the bore (13) or the center axis (M9) of the securing pin (9), respectively, penetrates the two receiving surfaces (5, 8) in sections.
7. Pressing lever arrangement (1) according to one of the preceding claims 4 to 6, characterized in that the at least one securing pin (9) runs transversely and at a distance to the center axis (M) of the pressing surface (6); and/or that the at least one securing pin (9) runs parallel and at a distance to the center axis (M).
8. Pressing lever arrangement (1) according to one of the preceding claims, characterized in that the at least one securing element (10, 11) is an elevation which extends away from one of the receiving surfaces, and which engages with a depression (11) extending into the other receiving surface.
9. Pressing lever arrangement (1) according to claim 8, characterized in that the elevation (10) extends away from the receiving surface (5) of the pressing jaw seat (4) and that the depression (11) extends into the receiving surface (8) of the pressing jaw (3), wherein elevation (10) or depression (11), respectively, are preferably arranged in the end regions (13) of said receiving surface (5).
10. Pressing lever arrangement (1) according to one of claims 8 or 9, characterized in that the elevation (10) or the depression (11), respectively, is formed in the direction of the center axis (M) and/or surrounding the center axis (M).
11. Pressing lever arrangement (1) according to one of the preceding claims, characterized in that the securing element is a material-bonded connection between the pressing jaw seat and the pressing jaw, wherein the material-bonded connection is in particular a soldered joint and/or in particular a welded joint and/or in particular an adhesive joint.
12. Pressing lever arrangement (1) according to one of the preceding claims, characterized in that the securing element is provided by a force-fit connection between pressing jaw (3) and pressing jaw seat (4), wherein it is provided in particular by an insertion of the pressing jaw (3) into the pressing jaw seat (4) by means of a heat sinking process.
13. Pressing lever arrangement (1) according to one of the preceding claims, characterized in that the receiving surface (5) of the pressing jaw seat (4) is essentially congruent with the receiving surface (8) of the pressing jaw (3) and/or that the receiving surfaces (5, 8) extend in a cylindrical manner, in particular in a circular cylindrical manner, around said center axis (M) of the pressing contour (7).
14. Pressing tool comprising two pressing lever arrangements (1) according to one of the preceding claims, wherein the one pressing lever is pivotable about a first pivot axis (A1) and the other pressing lever is pivotable about a second pivot axis (A2) from a starting position to a pressing position.

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