DE202019001563U1 - Press tool for a fitting with press tab - Google Patents

Abstract

Pressing tool for a fitting with a cylindrical part and a pressing tab protruding therefrom, which is to be pressed perpendicular to an axial direction of the fitting, which pressing tool has:
two tool halves (14, 15, 18) which can be closed with one movement towards one another and openable with one movement away from one another, each with a pressing part (15) serving to press the press tab during the closing movement,
and guide parts (18) serving to guide the press tool on the press fitting during the closing movement, the two tool halves (14,15,18) each having double guide parts (18) which are provided on both sides of the respective press part (15) with respect to the axial direction are,
and two plates (30) overlapping the respective guide parts (18) in a projection in a line direction perpendicular to the direction of the closing movement and axially parallel to the cylindrical part, namely one plate (30) on each side of the pressed parts (15) respectively. the direction of the line,
characterized in that the plates each lie outside the guide parts (18) in the line direction and cover these as cover plates (30) to the outside at least partially in a protective manner.

Description

The present invention relates to a pressing tool for pressing a fitting.

Fittings are used to attach a hose, and here preferably a pipeline, to another part, such as a fitting, or to couple lines to one another. A distinction is made between different types, namely according to the type of sealing attachment of the line to the fitting. In addition to self-locking sliding fittings, in which the line is inserted and fastened in the opposite direction under tensile load, and sliding fittings, in which a fitting part is moved in the axial direction (relative to the line), press fittings are also known. In these, a fitting part is plastically deformed with a special tool; As a rule, it is a sheet metal part. In many press fittings, a hollow cylindrical sheet metal press sleeve is used for pressing and is gripped and deformed by pressing tongs along essentially its entire circumference and thus also along the entire circumference of the line.

In contrast to this, there are more specific types of press fitting with a press tab protruding radially from an essentially hollow cylindrical or ring-shaped part (again with regard to the cylinder geometry and thus the line). During the pressing process, the tool only grips the pressing tab, which is pressed together perpendicular to the axial and radial directions in such a way that the ring-shaped part is tensioned and pressed onto the line. In the literature, referring to a relevant Swiss manufacturer, the Oetiker type is often used here, and the term “press ear” is occasionally used for the press tab.

The press tab is generally a sheet metal strip section which is formed in one piece with the annular part and projects radially outwardly with respect to the annular shape and often forms an essentially flat plateau which faces outwards. A sheet metal section of the press fitting consisting of the press tab and the ring-shaped or cylinder part is often also referred to as a collet. The pressing tool engages between the plateau and the ring-shaped part and creates or reinforces undercuts during pressing.

Reference can be made to the EP 2 341 273 A1 , the EP 2 497 989 A1 , the EP 2 607 764 A1 and finally the EP 2 607 768 A1 .

The associated pressing tools are sometimes also referred to as pressing tongs and often form attachments for motorized (in particular pneumatic) drives. For example, the aforementioned Swiss manufacturer Oetiker offers such press tools with a motor drive. According to the term “pliers”, the pressing tools have two tool halves that can be moved towards and away from one another, which corresponds to a closing and an opening movement. The tool halves regularly have more or less wedge-shaped tips that engage in the already mentioned area between the plateau of the collet and the press plate.

Here, of course, the tool halves initially have the function of pressing the pressing tab, but on the other hand, geometrical guidance of the pressing tool during the closing movement must also be ensured. This guiding function can result simply from the fact that a wedge-shaped tool half tip strikes as the closing movement progresses, thus forcing a correct alignment in which it can then penetrate deeper into the space.

However, it shows EP 3 090 834 A1 by the same applicant a further developed concept of a pressing tool with guide parts of the tool halves specially optimized for this purpose, which can support an operator in correct alignment. This concept is compatible with the present invention.

Reference is also made to the EP 3 090 835 A1 by the same applicant, who has been further developed on this basis with regard to the handling of a clippable part on the press fitting, specifically the press tab, which serves as an indicator for the pressing process. This particularly concerns ejection openings provided in the pressing tool. The content of this prior art is also compatible with the present invention.

Both the support of an operator in the correct positioning for pressing as well as the simple and confusion-proof control of the pressing of all fittings to be pressed by the mentioned indicator are due to the fact that the pressing processes on the construction site are due to time pressure, poor visibility, careless personnel or errors can occur in other circumstances. Significant progress has been made in this regard through the earlier applications described. This present application is based on the technical problem of specifying a pressing tool with a further improved security of use.

This object is achieved by a pressing tool for a fitting with a cylindrical one Part and a pressing tab protruding therefrom, which is to be pressed perpendicular to an axial direction of the fitting, which pressing tool has: two tool halves which can be closed with one movement and opened away from one another with one movement, each with a pressing part used to compress the press tab during the closing movement and guiding the press tool on the press fitting during the closing movement serving guide parts, wherein the two tool halves each have duplicated guide parts, which are provided with respect to the axial direction on both sides of the respective press part, and two the respective guide parts in a projection in one to the direction of Closing movement perpendicular and to the cylindrical part axially parallel line direction overlapping plates, namely one plate on each side of the pressed parts with respect to the line direction, characterized in that the plates in the line direction each outside alb of the guide parts and cover them as cover plates to the outside at least partially protectively.

Preferred refinements are given in the dependent claims.

In the patent documents of the applicant already cited, a distinction is made between pressed parts of the tool halves and guide parts, the guide parts for each tool half being double and arranged on both sides with respect to the line direction (the axial direction of the cylindrical part of the press fitting when the press tool is press positioned) on both sides of the press parts are. In this case, the guide parts in this prior art largely cover the pressed parts in this line direction to the outside, at least from the two axes of rotation provided there, about which the guide parts and the pressed parts can be pivoted.

In practice, however, it can happen that the part of the pressing tool which is front in relation to a longitudinal direction (facing the press fitting during pressing) is exposed to shock loads, e.g. B. because an operator is careless with it and bumps into it or because the pressing tool falls and impacts. This can lead to damage, in particular damage to the external guide parts. However, if the guide parts or the pressed parts are bent or otherwise impaired as a result of breaks or cracks, this can call into question or prevent correct pressing. In the more favorable case, this is recognized and the press tool is no longer used, with economic damage then remaining due to the defective press tool. In the worst case, the pressing tool is still used with the risk of incorrect pressing.

In this context, it should also be pointed out that the fundamentally favorable shape, which is also sought after within the scope of the present invention, of the parts of the guide parts relevant for the actual guide function, i.e. the parts that come into contact with the fitting, requires a certain hollow shape or concave configuration there which is naturally more sensitive than a massive and rather plate-shaped design.

The present invention is based on the idea that the guide parts described in the prior art are not entirely on the outside, at least not entirely. The invention therefore proposes external protection by means of a respective cover plate. This can be installed firmly and stably because it does not have to move with the pressed parts and guide parts and, moreover, can also be made relatively solid if necessary. On the one hand, it protects the guide parts and of course also the pressed parts by a relatively extensive side cover. On the other hand, however, areas not covered z. B. the guide parts are stabilized to the extent that they can be supported with shorter lever arms on the cover plate and, to the extent that they protrude beyond the cover plate, still experience a certain stabilization.

As with the patent documents cited, the pressed parts and guide parts are preferably mounted in a rotatable manner, that is to say can be moved in an articulated manner. As in the cited documents, however, a separate hinge axis is preferably provided for each tool half and, in turn, this hinge axis of each tool half is present there jointly for the guide parts and the pressing part. The hinge axes can in particular be implemented by axle bolts which penetrate the corresponding parts and which preferably also penetrate the cover plates. In this respect, the cover plates can then also take on the function of bearing plates, that is to say hold the axle bolt or bolts significantly. Such bearing plates also exist in the embodiments of the cited patent documents, but they are arranged within the guide parts with respect to the line direction. In this respect, the present invention can be produced in a favorable embodiment by changing the sequence of the parts (pressed parts, guide parts, bearing plate) compared to the prescribed embodiments. In this way, apart from the redesign, the present invention can be implemented without significant additional expenditure, in particular without additional parts, if this is desired. Then the component layers would be limited to the pressed parts, guide parts, cover plates and any protrusions of the bearing bolts (with circlips or nuts).

Furthermore, the cover plates should cover the guide parts flat, especially in the front area at risk of impact (i.e. the area facing the press fitting), this being fully applicable in a width direction (approximately parallel to the direction of the closing movement, i.e. perpendicular to the longitudinal direction and perpendicular to the line direction), as is the case Embodiment shows. This only applies to a limited extent in the longitudinal direction perpendicular to the line direction and the width direction (with respect to the cylindrical part of the press fitting radially and from its axis through the press tab through to the press tool, at least during the pressing process).

With regard to the longitudinal direction, the guide parts should namely not be covered all the way to the front by the cover plates according to one embodiment of the invention. If one does not leave a last, front remnant piece of the guide parts covered, further degrees of freedom with regard to a slim design of the pressing tool (in the line direction) are achieved, because then the thickness of the cover plates no longer necessarily adds to the dimension of the pressing tool in this line direction, at least in a front area. On the other hand, the foremost parts of the pressed parts and guide parts require a certain amount in this conduction direction. The embodiment illustrates this relationship.

In particular, the exemplary embodiment also makes it clear that the parts of the guide parts that are thickened in the front area in the line direction or the correspondingly slimmer design of the areas of the guide parts further back make it possible to "let the cover plates into the guide parts" in whole or in part (with regard to the line direction), so to let little or not protrude over this (with regard to the direction of the line).

Specifically, it is preferred that the guide parts are covered by the cover plates up to at least such a distance from the foremost side (based on the longitudinal direction) that this distance is at most 25%, preferably at most 20% or even at most 15%, of the corresponding distance in the vertical direction between an axis of rotation provided for the closing movement and said foremost point. Additionally or alternatively, it is preferred that the remaining distance between the foremost side of the cover plate and the foremost side of the pressing tool is at most 35%, preferably at most 30% or even at most 25% of the maximum width of the cover plate. On the other hand, the distance between the cover plates just described should be at least 2%, preferably at least 4%, at least 6% or even at least 8% in relation to the comparison distance in the longitudinal direction (in relation to the axis of rotation) or at least 10%, preferably at least 12 %, at least 14% or even at least 16% in relation to the stated width. Incidentally, in the first exemplary embodiment, these values are approximately 11% and approximately 19%, respectively.

Alternatively, the cover plates could also protrude all the way to the front, so the guide parts could not be thickened at the front as in the exemplary embodiment. Then the cover plates can cover the guide parts in the front area completely or at least largely laterally and in this respect ensure their protective function to a greater extent. On the other hand, the guiding concept in the embodiment at issue here requires a certain width of the guiding parts in the axial direction (of the cylindrical fitting part), so that the alternative embodiment discussed here would lead overall to a greater width in this direction. The thickness of the cover plates would have to be added in any case in the front area, unlike in the exemplary embodiment. In order to compensate for the increased stability, such an embodiment has certain disadvantages, for example when press fittings that are difficult to access are to be pressed, e.g. B. in front of elbows or T-pieces or in front of an adjacent wall.

As in the one already quoted EP 3 090 834 A1 it is preferably provided that at least in a final phase of the closing movement which is used for pressing, each pressing part can be moved towards one another via the respective guide parts. A distinction is made between the pressing function and the guiding function insofar as the corresponding pressing and guiding parts of the two tool halves are partially movable separately. In the remaining prior art, the tool halves can in a certain sense be assigned a guiding function, but this is more inevitably a result of the pressing function and the geometry of the pressing tab. In this respect, the guide parts stop in the final phase of the closing movement and only the pressed part continues to move. Correct positioning can be achieved by producing a form fit with appropriately adapted guide parts of the fitting. This form fit does not necessarily have to be complete, that is to say free of play, but can also be approximately helpful. A residual play naturally corresponds to a residual inaccuracy in the positioning and the positioning is not mathematical for reliable practical success either with the prior art or with the present invention to be carried out precisely. The term “form fit” does not necessarily mean that no positioning has to take place with regard to all conceivable degrees of freedom of movement. It is a technical success when the positioning affects certain lines of freedom of movement (and the person using it has to pay attention to the others). It is of course preferred that the form fit and positioning relate to all conceivable degrees of freedom.

According to the invention, the guide parts of the tool halves can be brought closer to the parts of the press fitting assigned to them than in the prior art, because in the prior art with a common movement of the guide parts and pressed parts (due to the one-piece design) before the actual compression between the guide parts of the tool halves and the press fitting parts assigned to them must remain a relatively large distance. If, on the other hand, the pressed parts are moved on by themselves in the final phase, the molded parts of the tool halves can accordingly be brought close to or even in contact with the press fitting parts assigned to them.

The fact that the movability was separate in the final phase already means that the respective pressing and guide parts cannot be designed in one piece. However, they preferably move around at least geometrically the same axis of rotation and more preferably also around the same joint axis in terms of structure. Furthermore, they preferably carry out a joint and coupled movement up to the beginning of the final phase in which the guide parts remain stationary, that is to say they are immobile relative to one another during this initial phase of the movement.

The geometric fit for positioning the guide parts and thus the pressing tool relative to the fitting, which was referred to above as "form fit", can for example consist of or be produced by approximately corresponding negative and positive shapes of the guide parts on the one hand on the pressing tool and on the other hand on the fitting. For example, an angled corner piece can be attached to the guide part or as a guide part of the pressing tool (for example when an outer side wall perpendicular to the joint axis and line direction meets and an end face which is approximately perpendicular to it and approximately parallel to the joint axis and line direction and faces the cylindrical fitting part and the line ) produce such a rectangular hollow shape. A corresponding projection or corner on the fitting then fits in and provides a corresponding guide during part of the closing movement.

The exemplary embodiment also shows a preferred configuration, namely an inclined guide surface, the indication “inclined” referring to the closing movement of the tool guide parts immediately before the final phase. This inclined guide surface can interact with the guide part on the fitting, in particular also with an inclined guide surface there, and cause it to be pushed into the correct position. In a preferred case, this relates to a central alignment of the pressing tool with regard to the line direction. For this purpose, the inclined guide surface is then preferably directed inwards with respect to the tool and is provided on a part of the guide part that is axially outer with respect to the line direction, for example an outer wall.

The guide parts preferably grip axially on both sides of the press tab, specifically preferably the guide parts of the press fitting, and thus guide in a centering manner along the line direction, ie axially.

In another, but combinable and likewise preferred variant, the inclined guide surface relates to the pressing tool to be pulled onto the fitting. For this purpose, this inclined guide surface can be provided on a part of the tool guide part which faces the cylindrical fitting part and the line and is thus outer part. Here, too, this inclined guide surface is directed inwards with respect to the tool, that is to say pointing away from the cylindrical fitting part and the line.

For the variants of the guide surfaces, refer to the EP 3 090 834 A1 referenced.

As already explained, the guide parts of the two tool halves come to a stop preferably before the final phase of the closing movement, i.e. before the actual pressing, and particularly preferably by a stop on the press fitting in connection with the establishment of the form fit.

Furthermore, the pressing parts and guide parts of each tool half can be coupled to one another in a displaceable manner, preferably by engaging a projection on one of the parts in a longitudinal slot on another, for example by engaging a projection on both axially outer sides of the two pressing parts in respective longitudinal slots on two axially adjacent guide parts. The projections in the longitudinal slots can move in such a way that the pressed parts can move on in the final phase of the shooting movement, the longitudinal slots also being able to define an end point for this movement (stop of the projection at the end of the longitudinal slot). On the other hand, this Coupling serve to ensure that the part with the longitudinal slot is taken back from the part with the projection when the pressing is completed. Accordingly, only the part with the projection or projections can then be motor-driven, for example the pressed part. In this coupling, the part carrying the projection or the projections can furthermore be resiliently coupled to the part carrying the longitudinal slot, the projection itself preferably being spring-loaded. As a result, it can be achieved that up to the stop of the guide parts (for example against one another) these are resiliently biased inwardly with respect to the pressing part and are thereby also defined in position. The pressed parts can then move on against the spring force for pressing.

When correctly positioned, a separation between the guide and the pressing is also provided to the extent that the pressed parts with their wedge-shaped tips only grasp the press tab itself and the guide part or parts of the fitting are not grasped by the tips. Conversely, the guide parts of the pressing tool are preferably designed in such a way that they do not interact with the pressing tab itself, but only with guide parts of the fitting that are independent of it.

According to a further preferred embodiment, a fitting part is provided which is removed from the fitting when it is pressed. It is an indicator, i.e. a part, the presence or absence of which on the fitting clearly indicates whether the pressing has already taken place or not. Such an indicator part can for example be clipped off the fitting.

The cover plates can form, either individually or together with adjacent areas of the guide parts (as in the exemplary embodiment), ejection openings for the indicator. Regarding these ejection openings, reference is made to the one already cited EP 3 090 835 A1 referenced. The cover plates and possibly also the guide parts form the outer walls of the pressing tool described in this document with regard to the line direction.

In this form, the actually previously known relationships with the marking of unpressed press fittings by the indicator, unclipping the indicator during pressing and ejection can advantageously be retained, although the cover plates according to the invention are present, simply by adapting them to shape, for example by a lateral indentation as in the embodiment, which then complements the guide parts to form the ejection openings.

The invention relates in particular to those pressing tools which are mobile for pressing in the operationally ready state, that is to say can be moved by people to the press fitting that is already basically assembled. This concerns on the one hand manually operated pressing tools, whereby in many cases the actual tool (also in the sense of this term in the present application) has to be mounted on a further device (basically a pair of pliers) which first enables the operation; in this case the entire device including pliers and tools is meant by “mobile”. On the other hand, the aspect also relates to motor drives for such tools, such as pressurized fluid drives, and in this case also to the overall device with tool and drive. In this case, “mobile” particularly preferably means that the device, including the tool and pliers or drive, is held in the hand during pressing.

In such cases, the tools are particularly at risk of being hit because they are more likely to hit or fall than in less mobile or non-mobile comparison cases.

Finally, the invention also relates to a use of a pressing tool according to the invention, in which a press fitting of the type described is actually pressed. The division of tasks between the guide parts and the pressed parts, already described in terms of the device, is preferably implemented, in particular by the fact that the guide parts perform their guiding task in a first section of the closing movement, but are no longer moved in a final phase of the closing movement, but only the pressed parts carry out the pressing.

It is also preferably used with a device that is mobile in the above sense, preferably in such a way that it is held in the hand.

• 1 zeigt in perspektivischer Darstellung ein Presswerkzeug nach dem Stand der Technik;
• 2 zeigt in analoger perspektivischer Darstellung ein erfindungsgemäßes Presswerkzeug;
• 3, 4 und 5 zeigen eine jeweilige mittige Schnittansicht durch das Presswerkzeug aus 2 mit unterschiedlichen Stellungen, wobei die Stellung in 3 der Ansicht in 2 entspricht;
• 6 bis 9 entsprechen den 2 bis 5, jedoch zu einem für größere Fittinge und größere Leitungsdimensionen ausgelegten Presswerkzeug.

The invention is explained in more detail below using an exemplary embodiment. The figures show the embodiment as follows:

• 1 shows in perspective a pressing tool according to the prior art;
• 2 shows a press tool according to the invention in an analogous perspective representation;
• 3 , 4th and 5 show a respective central sectional view through the pressing tool 2 with different positions, the position in 3 the view in 2 corresponds to;
• 6th to 9 correspond to the 2 to 5 , but to a pressing tool designed for larger fittings and larger pipe dimensions.

1 shows the prior art, namely a pressing tool according to the already cited EP 3 090 835 A1 , compare there 6th . This conventional pressing tool shows two pivot pins around each 16 ' swiveling pressed parts 15 ' , where in 1 under and over the pressed parts 15 ' Guide parts 18 ' are arranged, their form, function and movements in the cited application and also in the EP 3 090 834 A1 are described in more detail.

Between the pressed parts 15 ' and the leadership parts 18 ' there are plates in each case 30 ' involved in the movements of the pressed parts 15 ' and the stock parts 18 ' not participate and thereby the pivot pin 16 ' hold, with the bearing axle bolts 16 ' each outside of the guide parts 18 ' are secured with common snap rings. About these plates 30 ' the manual or motorized drives can be connected to the tool, which the in 1 leg protruding to the right rear 14 ' in extension of the pressed parts 15 ' and (in the manner already described in the prior art) via the pressed parts 15 ' by means of the pins 20 ' also the guide parts 18 ' move.

2 FIG. 11 shows an analogous view of an exemplary embodiment according to the invention, reference symbols analogous to the cited documents being used here and below and the reference symbols in FIG 1 each contain an apostrophe after the number and in the 2 to 9 Not.

2 clearly shows that the front area of the press tool facing the press fitting, i.e. the one in 2 Area pointing to the left forwards / downwards, essentially corresponds to the prescribed pressing tool. However, there are on each pressed part 15th , namely on its front left-facing side, two respective marking projections are provided, which are the subject of a parallel application and are irrelevant to the present invention. At the same time are the panels 30 ' from the cited prior art replaced by outside the guide parts 18th horizontal cover plates 30th . These cover plates cover most of the guide parts in a projection along the line direction, that is, parallel to the direction of the axis of rotation 18th , namely their entire extension in the width direction (in 2 from top left to bottom right) and in any case most of it lengthways (in 2 from bottom left to top right). This allows the cover plates 30th Intercept blows and bumps in this overlap area, whereby they are obviously made relatively strong from technical plastic or metal, in particular investment casting, and are therefore comparatively insensitive.

However, they do not develop such a protective function directly for the foremost area of the pressing tool, because there are front jaws there 31 the guide parts 18th that forward in front of the cover plates 30th protrude and in a similar form already in 1 you can see. In contrast to 1 however, the guide parts are 18th in the area of overlap with the cover plates 30th More than half the size (with regard to the direction of the line), so that despite the not inconsiderable thickness of the cover plates 30th this not in the direction of the line or only marginally over the front jaws 31 the guide parts 18th survive. This means that the pressing tool remains in place despite the side protection provided by the cover plates 30th overall relatively slim in the line direction, which can be of great advantage when a press fitting is used at poorly accessible assembly points.

On the other hand, the jaws allow 31 those in the EP 3 090 835 A1 Described design of the parts of the guide parts relevant to the leadership function 18th . You can also use 2 the corresponding (viewed in the width direction) rectangular L-shaped configuration of the inner ends of the jaws directly facing the press fitting 31 detect.

However, the cover plates stabilize 30th certainly also the front cheeks 31 , namely because the cover plates 30th the guide parts 18th enclose in the overlap area and thus hold in the event of impact loads, and so also the front jaws 31 are supported by relatively short lever arms. That is illustrated by a comparison with 1 Immediately clear where the effective lever arms up to the axle bolts 16 ' pass.

The 3 , 4th and 5 show a central section along the longitudinal direction through the pressed parts 15th and the associated legs 14th The figures differ from one another in the various relative positions of the pressed parts. 3 shows exactly like that 1 and 2 the position in which the front wedge tips of the pressed parts 15th are maximally approximated to each other, so the pressing position. In 4th on the other hand are these wedge tips and thus the pressed parts 15th somewhat withdrawn, being compared to 3 the guide parts 18th have not yet moved away from each other. 5 shows the open position in which both the pressed parts 15th as well as the guide parts 18th are moved apart.

When gripping a press strap, you would initially be in the position according to 5 embrace this press flap, then a closing movement in the position according to 4th perform so that the guide parts bring about correct positioning between the press fitting and its press tab on the one hand and the press tool on the other hand, whereupon with a movement into the position 3 the actual pressing takes place. This is described in detail in the earlier applications cited.

For illustration purposes, the 6th to 9 in a basically analogous sequence to the 2 to 6th a larger press tool for a larger press fitting, i.e. larger pipe diameters.

In the sectional views of 3 , 4th , 5 , 7th , 8th , 9 one can see a structure similar to that of the cited advance registrations. With 17th bores are designated for a spring, this compression coil spring acting on the arms of the pressed parts in the closing direction. Otherwise, however, the press tools shown are to be actuated by a motor by a drive device which is not shown and is known per se. Alternatively, they could also be used as pressing tongs with a manual drive device which is also known per se.

The entrainment mechanisms described in the cited applications between the guide and the pressed parts, namely springs 21st with cylinder housing and piston rod, can be found here in the pressed parts (instead of in the guide parts as in the pre-registrations). The associated pens 20th are the longitudinal slots or somewhat widened holes 19th out, which in turn lie in the guide parts and therefore cannot be seen because of the cover plates 30th are covered. With the smaller press tool from the 2-5 you can only see the driving pins 20th in the holes 19th . The associated springs (not shown) are in the blind holes to the right and left of the ejection opening 32 held and with the pen 20th connected on the opposite side.

In addition, the cited prior applications contain detailed explanations of the functioning of the press tools with a suitable press fitting, specifically an Oetiker fitting, the interaction of the press tool with an indicator attached to the press fitting, which is shown when the press tool is pressed by the press fitting clipped and through ejection openings which are also clearly visible in the present invention, here with the reference number 32 , can be ejected from the side. The ejection openings 32 are through indentations made in the cover plates from the front 30th formed and are more or less completely forward depending on the position through the jaws 31 of the guide parts closed. It can be clearly seen that these indentations for the ejection openings 32 the stability of the cover plates 30th do not affect it, in particular because there are no flat areas of the guide parts in this area 18th are to be covered.

The specific angled shape of the guide parts at their front ends facing the press fittings also results from the explanations in the previous applications and is used to guide the press tool or to position it correctly during the transition from the tool positions according to FIGS 5 and 9 in those according to the 4th and 8th .

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2341273 A1 [0005]
• EP 2497989 A1 [0005]
• EP 2607764 A1 [0005]
• EP 2607768 A1 [0005]
• EP 3090834 A1 [0008, 0023, 0030, 0042]
• EP 3090835 A1 [0009, 0035, 0042, 0047]

Claims (15)

Pressing tool for a fitting with a cylindrical part and a pressing tab protruding therefrom, which is to be pressed perpendicularly to an axial direction of the fitting, which pressing tool has: two tool halves (14, 15, which can be closed with one movement and can be opened with one movement away from one another) 18) each with a press part (15) serving to press the press tab during the closing movement, and guide parts (18) serving to guide the press tool on the press fitting during the closing movement, the two tool halves (14, 15, 18) each having a duplicate guide part (18), which are provided on both sides of the respective pressing part (15) with respect to the axial direction, and two plates (30) overlapping the respective guide parts (18) in a projection in a line direction perpendicular to the direction of the closing movement and axially parallel to the cylindrical part ), one plate (30) on each side of the P Ressteile (15) with respect to the line direction, characterized in that the plates in the line direction each lie outside the guide parts (18) and cover them as cover plates (30) to the outside at least partially in a protective manner. Press tool after Claim 1 , in which the pressing parts (15) and the guide parts (18) of the tool halves (14, 15, 18) can be moved in an articulated manner, preferably around a separate joint axis (16) for each tool half (14, 15, 18), which is preferably exists jointly for the respective guide parts (18) and the respective press part (15). Press tool after Claim 2 , in which at least one axle bolt forming the at least one hinge axis (16) is held by the two cover plates (30) as bearing plates. Press tool after Claim 2 or 3 , in which the two cover plates (30) are penetrated by one of the hinge axis (16) or by two axle bolts each forming their own hinge axis (16). Press tool after Claim 3 , optionally also Claim 4 , in which no further bearing plates are provided for the at least one axle bolt and preferably no further component layer is provided in the line direction in addition to the cover plates (30), the guide parts (18), the pressed parts (15) and any protrusions of the at least one bearing bolt . Pressing tool according to one of the preceding claims, in which the two cover plates (30) completely laterally cover the respective guide parts with respect to a width direction parallel to the direction of the closing movement. Pressing tool according to one of the preceding claims, in which the two cover plates (30) cover the respective guide parts (18) with respect to a longitudinal direction perpendicular to the direction of the closing movement and to the line direction up to at least a distance from the foremost side of the pressing tool with respect to this longitudinal direction, which distance is at most 25% of the maximum extent of the cover plates (30) in the width direction and / or at most 35% of the distance in the longitudinal direction between a hinge axis (16) for the closing movement and the foremost side of the pressing tool with respect to this longitudinal direction. Pressing tool according to one of the preceding claims, in which the guide parts (18) protrude partially in the longitudinal direction over the cover plates (30), wherein preferably the protruding parts of the guide parts in the line direction compared to that between the cover plates (30) and the pressed parts ( 15) are thickened. Press tool according to one of the preceding claims, in which the guide parts (18) are designed not to take part in the actual pressing of the press tab and to serve exclusively to guide the press tool. Press tool after Claim 9 , in which at least in one final phase of the closing movement, which is used for pressing, each pressing part (15) can be moved towards one another via the respective guide parts (18). Press tool after Claim 10 , in which the pressing parts (15) and the guide parts (18) of each tool half (14, 15, 18) are coupled to one another by engagement of a projection (20) in a longitudinal slot (19), the longitudinal slot (19) on the one hand in the Final phase of the closing movement allows the pressing part (15) to move beyond the guide part (18) and, on the other hand, serves to entrain during an opening movement. Press tool after Claim 11 , in which the part (15) carrying the projection (20), preferably the projection (20) itself, is resiliently coupled to the part (18) carrying the longitudinal slot (19). Pressing tool according to one of the preceding claims, in which the two tool halves (14, 15, 18) in respective outer walls of the tool halves (14, 15, 18) which are lateral with respect to the conduction direction when the tool halves (14, 15) are closed with respect to this outer wall , 18) have an ejection opening (32) for ejecting an indicator removed from the press fitting during pressing, the ejection openings (32) being at least partially delimited by the cover plates (30) and preferably also by the guide parts (18). Press tool according to one of the preceding claims, which is fully equipped for pressing by manual or motorized actuation and is mobile in this state, preferably to be held in the hand for pressing. Use of a pressing tool according to one of the preceding claims for pressing a fitting with a cylindrical part and a pressing tab protruding therefrom, in which the pressing tool is preferably mobile together with a device for manual or motorized actuation during pressing, preferably being held in the hand.

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