EP3718696B1 - Press tool with marking for a fitting with press tab - Google Patents

Press tool with marking for a fitting with press tab Download PDF

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Publication number
EP3718696B1
EP3718696B1 EP19167574.3A EP19167574A EP3718696B1 EP 3718696 B1 EP3718696 B1 EP 3718696B1 EP 19167574 A EP19167574 A EP 19167574A EP 3718696 B1 EP3718696 B1 EP 3718696B1
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EP
European Patent Office
Prior art keywords
press
fitting
tool
pressing
cylindrical part
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EP19167574.3A
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German (de)
French (fr)
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EP3718696A1 (en
Inventor
Pascal Graf
Urs Heusser
Patrick Mainhart
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Geberit International AG
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Geberit International AG
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Priority to EP19167574.3A priority Critical patent/EP3718696B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B25/00—Implements for fastening, connecting or tensioning of wire or strip
    • B25B25/005—Implements for fastening, connecting or tensioning of wire or strip for applying wire clasps to hose couplings

Definitions

  • 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.
  • press fittings in addition to self-locking sliding fittings, in which the line is inserted and fastens itself under tensile stress in the reverse direction, and sliding fittings, in which a fitting part is shifted in the axial direction (relative to the line) for fastening, press fittings are also known.
  • a fitting part is plastically deformed with a special tool; it is usually a sheet metal part.
  • a hollow-cylindrical sheet metal pressing sleeve is used for pressing and is gripped and deformed by pressing tongs along its essentially entire circumference and thus also along the entire circumference of the line.
  • press fitting types with a press lug protruding radially (again in relation to the cylinder geometry and thus the line) from an essentially hollow-cylindrical or ring-shaped part.
  • the tool grips only the pressing tab, which is compressed perpendicularly to the axial and to the radial direction in such a way that the ring-shaped part is stretched and pressed onto the line.
  • the Oetiker type is often used in reference to a relevant Swiss manufacturer, and the expression "press ear” is occasionally used for the press lug.
  • the press tab is usually a sheet metal strip section formed in one piece with the ring-shaped part and protruding radially outwards with respect to the ring shape, often with a substantially flat plateau forms, pointing outwards.
  • a sheet metal section of the press fitting consisting of the press lug and the ring-shaped or cylindrical part is often also referred to as a collet.
  • the pressing tool grips between the plateau and the ring-shaped part and creates or reinforces undercuts during pressing.
  • the U.S. 5,282,295 describes a fitting with a press tab, with a cylindrical part of the fitting initially being open and being able to be closed by inserting a tongue into a matching receptacle.
  • the recording is a bulge in the sheet metal structure of the cylindrical part, probably produced by plastic deformation.
  • the U.S. 2011/138606 A1 describes a crimping tool for pressing crimping tabs on fittings.
  • the foremost responsible for the compression Areas of the pliers are shaped in such a way that they adjust the position of the fitting before pressing.
  • the WO 2018/112529 A1 describes a pressing tool that has a recess to take account of the dimensional tolerances of cylindrical fittings to be pressed.
  • a tab of the fitting forms in such a recess so that the excess material does not interfere with the pressing.
  • a pressing tool for a fitting for attaching a hose or pipeline to another part which fitting has a cylindrical part and a press lug protruding therefrom, which press lug is to be plastically pressed together perpendicularly to an axial direction of the cylindrical part of the fitting in order to clamp the cylindrical part and press it onto the line
  • the pressing tool having two tool halves which can be closed towards one another with one movement and opened with one movement away from one another, each of which has a pressing part which is used to press the pressing tab during the closing movement
  • the mutually facing and with respect to the pressing movement of the pressing tool front parts of the pressing parts are wedge-shaped and designed to grip a cylindrical part of the fitting facing foot of the pressing tab and to compress during the pressing movement and in this way the pressing tab plastis ch to deform, marked by a marking device in the form of at least one projection and/or at least one recess on at least one of the pressing parts, specifically on a side of the pressing part facing the cylindrical part of the press fitting.
  • the invention proposes a marking device on a side of a pressing tool or a pressing part of the pressing tool that faces the cylindrical part of the press fitting, resulting in a marking on this cylindrical part itself.
  • a projection (or a recess) as a marking device can leave a depression (or even a bulge) on the cylindrical part of the press fitting.
  • the influence of the marking device on the plastic deformation relates entirely or essentially to the cylindrical part of the press fitting and to a lesser extent or not to the press lug itself. The above-described risk of influencing the plastic deformation of the press lug can thus be counteracted.
  • the invention is fundamentally open and is aimed equally at possible dating of pressing tools, quality assessments based on the markings produced or the tracking of the pressing tool type and the like. This will be discussed in more detail later.
  • a pressing part of the pressing tool which means the section responsible for the actual pressing.
  • this corresponds to the language used in the already cited EP 3 090 834 A1 , which also mentions guide parts (which are not necessary for the present invention, but are certainly conceivable).
  • a pressed part usually has approximately the shape of a wedge in the area relevant here and, as a rule, two pressed parts are provided on pressing tool halves that face one another and are moved towards one another during the pressing movement.
  • the marking device is provided on a side facing the cylindrical part of the press fitting during the pressing operation in order to apply a marking to it.
  • the press lugs in so-called Oetiker fittings are pressed in such a way that the pressing tool grips the press lug and not the cylindrical part of the fitting.
  • this side of the stamping corresponds to an outside.
  • the pressing of the press fitting affects the foot of Oetiker press lugs and results in the foot being narrower in the circumferential direction in the pressed state than one further outward in relation to the cylindrical part of the press fitting lying part of the press flap.
  • the marking on the press fitting is provided adjacent to the foot of the press tab, i.e. a section of the press tab adjoining the cylindrical part or facing the cylindrical part, in such a way that the pressed press tab marks the marking at least partially towers over This is based on a radial projection (in relation to the cylindrical shape of the cylindrical part).
  • At least one projection of the marking device is preferably provided and the marking device preferably has no recess. Accordingly, the marking device according to this embodiment leaves a depression and preferably no bulge or the like. According to the inventors' experience, such markings are clearer and their production during the pressing process is more reliable.
  • a projection or a recess in the above sense is defined as a local convex or concave deviation from a shape that determines the area surrounding the corresponding surface of the pressed part. If a plurality of projections and/or recesses are provided, a wavy shape or the like may result. The projections or recesses are then defined accordingly in relation to a smoothed surface that forms a quasi-average value. When there is no recess between a plurality of projections against areas outside of these plurality of projections, an area between e.g. B. two projections are not considered as a recess.
  • At least two and particularly preferably two or three projections are provided per pressed part.
  • a plurality of projections increases security and visibility on the one hand. For example, if for reasons some irregularity a marking does not succeed quite regularly, then there is at least one more. On the other hand, overly complex structures are preferably avoided and, in the inventors' estimation, three projections are normally sufficient.
  • the projections may preferably keep a certain minimum distance from each other in the width direction of the stamping. This direction corresponds to the axial direction of the cylindrical part and is perpendicular to the direction of the pressing movement. If this minimum distance makes up 20% or preferably even 25%, 30% or even 35% of the entire width of the pressed part in this direction, markings which are particularly clearly recognizable and separate from one another can be produced.
  • the projections or recesses are preferably provided directly on a corresponding front edge of the pressing part or parts, ie at the front with regard to the pressing direction. This is preferably the case according to at least one of the two following criteria. Observing the pressing part in a sectional plane perpendicular to the axial direction (of the cylindrical part), the front edge described forms a convex zone. Accordingly, the projections or recesses should lie at least partially in this convex zone.
  • the second possible definition relates to the thickness of the pressing in its front area.
  • This thickness shall be defined at the end of the convex zone described and the projections or recesses shall preferably be at least partly within a distance measured from the foremost point.
  • the projections with an elongated shape in this sense, are more pronounced (ie “higher”) at the front than in a rear area. The rear area is then used more for support.
  • the markings or marking devices are used to distinguish (at least) different press tool sizes, ie designs for press fittings of different sizes.
  • pressing tools are preferably differentiated from one another as to whether they are designed for motorized or manually operated pressing. Both occur in practice and normally there are interchangeable pressing tools both on manually operated pressing devices and on motorized pressing tools, with these typically not being interchangeable. You can then use a corresponding marking to track whether a possibly leaking fitting was pressed manually or by motor, which can be of interest because manual pressings are somewhat more prone to errors. Alternatively or additionally, you can also track whether the right pressing tool size for the fitting was used or possibly an unsuitable one.
  • the use of original pressing tools can preferably also (or instead) be traced through the marking, i.e. those that the manufacturer of the press fitting has released for pressing.
  • Such questions are very important with regard to possible warranty discussions in the event of damage and they also serve to trace errors in the event of damage, i.e. ultimately to gain experience and progress.
  • the invention also relates to a set of pressing tools having different marking devices, in which these pressing tools can thus be distinguished from one another with regard to the markings produced.
  • figure 1 shows the prior art, namely a pressing tool according to the already cited EP 3 090 835 A1 , compare there figure 6 .
  • This conventional pressing tool shows two pressing parts 15' that can be pivoted about respective pivot pins 16', wherein in figure 1 are arranged under and above the pressing parts 15 'guide parts 18', the form, function and movements in the cited application and also in the EP 3 090 834 A1 are described in more detail.
  • FIG figure 2 shows an analogous view of an exemplary embodiment according to the invention, reference numerals analogous to the cited documents being used here and in the following, and the reference numerals in FIG figure 1 each contain an apostrophe after the number and in the Figures 2 to 6 Not.
  • FIG 2 clearly shows that the front area of the pressing tool facing the press fitting, i.e. the in figure 2 area pointing to the left in front/below, essentially corresponds to the prescribed pressing tool.
  • the plates 30' from the cited prior art are replaced by cover plates 30 located outside the guide parts 18.
  • these cover plates cover the vast majority of the guide parts 18, namely their entire extent in the Latitude (in figure 2 from top left to bottom right) and at least most of it in the longitudinal direction (in figure 2 from bottom left to top right).
  • the cover plates 30 can absorb blows and impacts in this overlapping area, and they are evidently made of relatively strong technical plastic or metal, in particular investment casting, and are therefore comparatively insensitive. This is explained in more detail in a parallel application.
  • the pressing tools shown can be motor-actuated by a drive device which is not shown and is already known per se. Alternatively, they could also be used as pressing tongs with a manual drive device that is also known per se.
  • the marking devices can be used to distinguish between dies and also to distinguish between powered and manual drives and of course to distinguish between different periods of manufacture of dies.
  • the Figures 4 to 6 show one of the two pressing parts 15 figure 2 , namely its front area with in the figures 4 and 5 to the right and in figure 6 front edge 34 pointing forward.
  • Auxiliary lines are drawn in the figures, which in particular separate concave from convex areas or from straight areas and thus illustrate the geometry.
  • two additional geometric dimensions are indicated.
  • the upper and lower ends of the convex zone are indicated with auxiliary lines.
  • a geometric quantity already used earlier in the description namely the thickness of the pressed part at the end of the convex zone, denoted here by d. It has already been stated that the markers are preferably at least partially within 30% of the foremost point in the pressing direction (ie here from the leading edge 34), the 30% relating to the thickness d.
  • the marking device here consists exclusively of projections 33 without a recess, with two projections 33 being provided on each pressing part 15 .
  • These projections 33 are like figure 6 12, clearly spaced from each other, here by a third of the total width b of the pressing part 15 in the axial direction.
  • the markings produced can thus be perceived clearly separately from one another, remain independent of one another in their effects with regard to plastic deformation and there is also leeway to make statements about the pressing tool with regard to its size, age and drive through different such distances or also different numbers of projections or something similar to do.
  • the invention makes particular sense in a system or set of tools which accordingly systematically have different marking devices for producing correspondingly different markings in the pressed press fittings.
  • the figures show together and also figure 4 for itself that the projections 33 are elongated, i.e. significantly longer than wide in the pressing direction (according to figure 6 ) and high (according to figure 5 ).
  • they are concentrated (width) and limited to a localized marking.
  • they are stable because they are elongated and not too high, so that they can withstand a large number of pressing processes without any significant change. contributes to this of course also the rounded shape accordingly figure 4 at.
  • the projections 33 are preferably made in one piece and integrally in a shaping process that produces the pressing parts 15 and therefore consist of the same material as the rest of the pressing parts 15. Forged metal parts but also hard metal inserts can be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)

Description

Die vorliegende Erfindung bezieht sich auf ein Presswerkzeug zum Verpressen eines Fittings.The present invention relates to a pressing tool for pressing a fitting.

Fittinge dienen zum Befestigen einer Schlauch- und hier vorzugsweise Rohrleitung an einem anderen Teil, etwa einer Armatur, oder zum Koppeln von Leitungen aneinander. Man unterscheidet unterschiedliche Typen, und zwar nach der Art der abdichtenden Befestigung der Leitung an dem Fitting. Neben selbst-arretierenden Schiebefittingen, bei denen die Leitung eingesteckt wird und sich bei Zugbelastung in umgekehrter Richtung selbst befestigt, und Schiebefittingen, bei denen ein Fittingteil zur Befestigung in axialer Richtung (bezogen auf die Leitung) verschoben wird, sind auch Pressfittinge bekannt. Bei diesen wird ein Fittingteil mit einem speziellen Werkzeug plastisch verformt; im Regelfall handelt es sich um ein Metallblechteil. Bei vielen Pressfittingen dient dabei eine hohlzylindrische Metallblech-Presshülse zum Verpressen und wird entlang ihres im Wesentlichen gesamten Umfangs und damit auch entlang des gesamten Umfangs der Leitung von einer Presszange gegriffen und verformt.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, depending on 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 fastens itself under tensile stress in the reverse direction, and sliding fittings, in which a fitting part is shifted in the axial direction (relative to the line) for fastening, press fittings are also known. With these, a fitting part is plastically deformed with a special tool; it is usually a sheet metal part. In the case of many press fittings, a hollow-cylindrical sheet metal pressing sleeve is used for pressing and is gripped and deformed by pressing tongs along its essentially entire circumference and thus also along the entire circumference of the line.

Im Unterschied dazu gibt es speziellere Pressfittingtypen mit von einem im Wesentlichen hohlzylindrischen beziehungsweise ringförmigen Teil radial (wieder in Bezug auf die Zylindergeometrie und damit die Leitung) abstehender Presslasche. Beim Verpressen greift das Werkzeug nur die Presslasche, wobei diese senkrecht zur axialen und zur radialen Richtung in solcher Weise zusammengepresst wird, dass der ringförmige Teil gespannt und auf die Leitung aufgedrückt wird. In der Literatur wird hier in Anlehnung an einen einschlägigen Schweizer Hersteller öfters auch von Oetiker-Typ gesprochen, gelegentlich findet sich für die Presslasche auch der Ausdruck "Pressohr".In contrast to this, there are more special press fitting types with a press lug protruding radially (again in relation to the cylinder geometry and thus the line) from an essentially hollow-cylindrical or ring-shaped part. When pressing, the tool grips only the pressing tab, which is compressed perpendicularly to the axial and to the radial direction in such a way that the ring-shaped part is stretched and pressed onto the line. In the literature, the Oetiker type is often used in reference to a relevant Swiss manufacturer, and the expression "press ear" is occasionally used for the press lug.

Bei der Presslasche handelt es sich in der Regel um einen einstückig mit dem ringförmigen Teil ausgebildeten Blechstreifenabschnitt, der radial gegenüber der Ringform nach außen vorsteht und dabei oft ein im wesentlichen flaches Plateau bildet, das nach außen weist. Ein aus der Presslasche und dem ringförmigen beziehungsweise Zylinderteil bestehender Metallblechabschnitt des Pressfittings wird oft auch als Spannzange bezeichnet. Das Presswerkzeug greift zwischen das Plateau und den ringförmigen Teil und erzeugt oder verstärkt beim Verpressen Hinterschnitte.The press tab is usually a sheet metal strip section formed in one piece with the ring-shaped part and protruding radially outwards with respect to the ring shape, often with a substantially flat plateau forms, pointing outwards. A sheet metal section of the press fitting consisting of the press lug and the ring-shaped or cylindrical part is often also referred to as a collet. The pressing tool grips between the plateau and the ring-shaped part and creates or reinforces undercuts during pressing.

Beispielhaft kann verwiesen werden auf die EP 2 341 273 A1 , die EP 2 497 989 A1 , die EP 2 607 764 A1 und schließlich die EP 2 607 768 A1 .For example, reference can be made to 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 .

Die zugehörigen Presswerkzeuge werden gelegentlich auch als Presszangen bezeichnet und bilden häufig Aufsätze für motorische (insbesondere pneumatische) Antriebe. Beispielsweise bietet die bereits erwähnte Schweizer Herstellerin Oetiker solche Presswerkzeuge mit Motorantrieb an. Dem Begriff "Zange" entsprechend weisen die Presswerkzeuge zwei Werkzeughälften auf, die aufeinander zu und voneinander weg bewegbar sind, was einer Schließ- und einer Öffnungsbewegung entspricht. Die Werkzeughälften weisen dabei regelmäßig Pressteile mit mehr oder weniger keilförmigen Spitzen auf, die in den bereits erwähnten Bereich zwischen dem Plateau der Spannzange und der Presslasche eingreifen.The associated pressing tools are sometimes also referred to as pressing tongs and often form attachments for motor (particularly pneumatic) drives. For example, the already mentioned Swiss manufacturer Oetiker offers such motor-driven pressing tools. Corresponding to the term "pliers", the pressing tools have two tool halves which can be moved towards and away from one another, which corresponds to a closing and an opening movement. The tool halves regularly have pressed parts with more or less wedge-shaped tips, which engage in the already mentioned area between the plateau of the collet and the press lug.

Dabei haben die Werkzeughälften zwei Funktionen, nämlich einerseits natürlich die Verpressung der Presslasche, andererseits aber auch eine geometrische Führung des Presswerkzeugs bei der Schließbewegung, um die Bedienungsperson hinsichtlich einer korrekten Positionierung des Presswerkzeugs relativ zum Fitting (oder umgekehrt) zu unterstützen. Diese Führungsfunktion kann sich einfach daraus ergeben, dass eine keilförmige Pressteil-Spitze bei fortschreitender Schließbewegung anstößt und damit eine korrekte Ausrichtung erzwingt, in der sie dann tiefer in den Zwischenraum eindringen kann. Hinsichtlich der beschriebenen geometrischen Führung des Presswerkzeugs kann zusätzlich verwiesen werden auf die EP 3 090 834 A1 .The tool halves have two functions: on the one hand, of course, the pressing of the press tab, but on the other hand, also a geometric guidance of the pressing tool during the closing movement, in order to support the operator with regard to correct positioning of the pressing tool relative to the fitting (or vice versa). This guiding function can result simply from a wedge-shaped stamping tip hitting as the closing movement progresses, thus forcing a correct alignment in which it can then penetrate deeper into the gap. With regard to the described geometric guidance of the pressing tool, reference can also be made to EP 3 090 834 A1 .

Die korrekte Positionierung und ein vollständiger Pressvorgang sind für die Qualität der Verpressung und damit die Sicherheit der hergestellten Dichtverbindung von Bedeutung. Aus diesem Grund schlägt die EP 0 897 503 A1 eine charakteristische Markiereinrichtung innenseitig an einem Presswerkzeug vor. Bei der Verpressung soll dementsprechend ein charakteristisches Prägezeichen auf der Außenmantelfläche eines zylindrischen Pressfittings verbleiben, wobei sich dieser Stand der Technik auf zylindrische Pressfittinge ohne Presslasche bezieht. Die Qualität dieses Prägezeichens soll die Qualität der Verpressung ablesbar machen.Correct positioning and a complete pressing process are essential for the quality of the pressing and thus the safety of the sealing connection that is produced significant. For this reason, the EP 0 897 503 A1 a characteristic marking device on the inside of a pressing tool. Accordingly, a characteristic embossed mark should remain on the outer lateral surface of a cylindrical press fitting during pressing, with this prior art relating to cylindrical press fittings without a press lug. The quality of this embossed mark should make the quality of the pressing legible.

Außerdem schlägt die WO 2004/096499 A1 eine Markiereinrichtung eines Presswerkzeugs ebenfalls innenseitig vor, die bei der Verpressung entsprechende Spuren auf der Außenmantelfläche eines presslaschenlosen Pressfittings hinterlässt. Hier allerdings dienen diese Ausnehmungen oder Erhebungen als Markierung zur Identifizierung des Presswerkzeugs und Rückverfolgung, und zwar im Hinblick auf eine vom Hersteller vorgegebene maximale Nutzungsdauer und dementsprechend auf das Alter des Presswerkzeugs. Durch monatliche oder jährliche Änderungen der Markiereinrichtung kann somit die Verwendung eines älteren Presswerkzeugs erkannt werden.In addition, the WO 2004/096499 A1 a marking device of a pressing tool also on the inside, which leaves corresponding marks on the outer lateral surface of a press fitting without press lugs during pressing. Here, however, these recesses or elevations serve as markings for identifying the pressing tool and for tracing back, specifically with regard to a maximum service life specified by the manufacturer and accordingly to the age of the pressing tool. The use of an older pressing tool can thus be recognized by monthly or annual changes to the marking device.

Zum Stand der Technik wird ferner verwiesen auf die US 2018/0333832 A1 mit einer speziell geformten Zange. Von einer elastischen Schelle radial abstehende Laschen können in eigens dafür optimierten Schlitzen in den Greifflächen der Zange gefangen werden und erlauben einen sicheren Griff. Die Zange drückt über die Laschen die Schelle radial auseinander, sodass sie sich von einem Rohrstück löst.Reference is also made to the prior art U.S. 2018/0333832 A1 with specially shaped pliers. Tabs protruding radially from an elastic clip can be caught in specially optimized slots in the gripping surfaces of the pliers and allow a secure grip. The pliers press the clamp radially apart via the lugs so that it detaches from a piece of pipe.

Die US 5,282,295 beschreibt einen Fitting mit einer Presslasche, wobei ein zylindrischer Teil des Fittings zunächst offen und durch Einstecken einer Zunge in eine dazu passende Aufnahme schießbar ist. Die Aufnahme ist eine wohl durch plastische Verformung an dem zylindrischen Teil erzeugte Ausbuchung in dessen Blechstruktur.the U.S. 5,282,295 describes a fitting with a press tab, with a cylindrical part of the fitting initially being open and being able to be closed by inserting a tongue into a matching receptacle. The recording is a bulge in the sheet metal structure of the cylindrical part, probably produced by plastic deformation.

Die US 2011/138606 A1 beschreibt eine Presszange für die Verpressung von Presslaschen an Fittingen. Die für die Verpressung verantwortlichen vordersten Bereiche der Zange sind so geformt, dass sie vor der Verpressung eine Positionsjustage bzgl. des Fittings herstellen.the U.S. 2011/138606 A1 describes a crimping tool for pressing crimping tabs on fittings. The foremost responsible for the compression Areas of the pliers are shaped in such a way that they adjust the position of the fitting before pressing.

Die WO 2018/112529 A1 beschreibt ein Presswerkzeug, das mit Rücksicht auf Maßtoleranzen zu verpressender zylindrischer Fittinge eine Aussparung aufweist. Im Fall etwas zu großer Fittinge bildet sich in eine solche Aussparung eine Lasche des Fittings hinein, sodass der Materialüberschuss die Verpressung nicht stört.the WO 2018/112529 A1 describes a pressing tool that has a recess to take account of the dimensional tolerances of cylindrical fittings to be pressed. In the case of fittings that are a bit too large, a tab of the fitting forms in such a recess so that the excess material does not interfere with the pressing.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Presswerkzeug für die Verpressung von Pressfittingen mit einer Presslasche vorzuschlagen, das hinsichtlich der Sicherheit und Qualität der Verpressung vorteilhaft weitergebildet ist.The present invention is based on the object of proposing a pressing tool for pressing press fittings with a press lug, which is advantageously further developed with regard to the safety and quality of the pressing.

Diese Aufgabe wird gelöst durch ein Presswerkzeug für einen Fitting zum Befestigen einer Schlauch- oder Rohrleitung an einem anderen Teil, welcher Fitting einen zylindrischen Teil und eine davon abstehende Presslasche aufweist, welche Presslasche senkrecht zu einer axialen Richtung des zylindrischen Teils des Fittings plastisch zusammen zu pressen ist, um den zylindrischen Teil zu spannen und auf die Leitung aufzudrücken, wobei das Presswerkzeug zwei mit einer Bewegung aufeinander zu schließbare und mit einer Bewegung voneinander weg öffenbare Werkzeughälften aufweist, welche jeweils einen der Verpressung der Presslasche bei der Schließbewegung dienenden Pressteil haben, wobei die einander zugewandten und hinsichtlich der Pressbewegung des Presswerkzeugs vorderen Teile der Pressteile keilförmig und dazu ausgelegt sind, einen dem zylindrischen Teil des Fittings zugewandten Fuß der Presslasche greifen und bei der Pressbewegung zusammenzudrücken und in dieser Weise die Presslasche plastisch zu verformen, gekennzeichnet durch eine Markiereinrichtung in Form zumindest eines Vorsprungs und/oder zumindest einer Ausnehmung an zumindest einem der Pressteile, und zwar an einer dem zylindrischen Teil des Pressfittings zugewandten Seite des Pressteils.This object is achieved by a pressing tool for a fitting for attaching a hose or pipeline to another part, which fitting has a cylindrical part and a press lug protruding therefrom, which press lug is to be plastically pressed together perpendicularly to an axial direction of the cylindrical part of the fitting in order to clamp the cylindrical part and press it onto the line, with the pressing tool having two tool halves which can be closed towards one another with one movement and opened with one movement away from one another, each of which has a pressing part which is used to press the pressing tab during the closing movement, the mutually facing and with respect to the pressing movement of the pressing tool front parts of the pressing parts are wedge-shaped and designed to grip a cylindrical part of the fitting facing foot of the pressing tab and to compress during the pressing movement and in this way the pressing tab plastis ch to deform, marked by a marking device in the form of at least one projection and/or at least one recess on at least one of the pressing parts, specifically on a side of the pressing part facing the cylindrical part of the press fitting.

Daneben richtet sich die Erfindung auch auf die in den abhängigen Ansprüchen angegebenen Ausgestaltungen, auf einen Satz erfindungsgemäßer Presswerkzeuge, auf die Verwendung eines erfindungsgemäßen Presswerkzeugs.In addition, the invention also relates to the configurations specified in the dependent claims, to a set of pressing tools according to the invention, to the use of a pressing tool according to the invention.

Die Erfindung richtet sich im Unterschied zu dem zuletzt zitierten Stand der Technik auf Presswerkzeuge für die Verpressung von Presslaschen (statt der zylindrischen Pressfittinge im zuletzt zitierten Stand der Technik). Wenn bei solchen Presswerkzeugen innenseitig an einem Pressteil eine Markiereinrichtung vorgesehen ist, so resultiert dies nach den Ergebnissen der Erfinder zwar in einer gut sichtbaren Markierung an der Presslasche selbst, insbesondere an deren dem zylindrischen Teil des Pressfittings schräg zugewandten Unterseite. Jedoch hat sich herausgestellt, dass solche Markierungen die Verformung der Presslasche nachteilig beeinflussen können und damit die Gefahr einer Verschlechterung der Verpressung besteht.In contrast to the prior art cited last, the invention is directed to pressing tools for pressing press tabs (instead of the cylindrical press fittings in the prior art cited last). If a marking device is provided on the inside of a pressing part in such pressing tools, the inventors found that this results in a clearly visible marking on the pressing lug itself, particularly on its underside facing the cylindrical part of the press fitting at an angle. However, it has been found that such markings can have a disadvantageous effect on the deformation of the press lug and there is therefore a risk that the pressing may deteriorate.

Stattdessen schlägt die Erfindung eine Markiereinrichtung an einer dem zylindrischen Teil des Pressfittings zugewandten Seite eines Presswerkzeugs bzw. eines Pressteils des Presswerkzeugs vor, woraus sich eine Markierung an diesem zylindrischen Teil selbst ergibt. Zum Beispiel kann ein Vorsprung (oder eine Ausnehmung) als Markiereinrichtung eine Vertiefung (oder auch Ausbeulung) an dem zylindrischen Teil des Pressfittings hinterlassen. Dementsprechend betrifft der Einfluss der Markiereinrichtung auf die plastische Verformung ganz oder im Wesentlichen den zylindrischen Teil des Pressfittings und weniger oder nicht die Presslasche selbst. Damit kann der oben beschriebenen Gefahr einer Beeinflussung der plastischen Verformung der Presslasche entgegengewirkt werden.Instead, the invention proposes a marking device on a side of a pressing tool or a pressing part of the pressing tool that faces the cylindrical part of the press fitting, resulting in a marking on this cylindrical part itself. For example, a projection (or a recess) as a marking device can leave a depression (or even a bulge) on the cylindrical part of the press fitting. Accordingly, the influence of the marking device on the plastic deformation relates entirely or essentially to the cylindrical part of the press fitting and to a lesser extent or not to the press lug itself. The above-described risk of influencing the plastic deformation of the press lug can thus be counteracted.

Andererseits besteht die Möglichkeit, z. B. die Qualität und/oder Authentizität der Verpressung bzw. des richtigen oder eines ausreichend aktuellen Presswerkzeugs für den Pressfitting zu dokumentieren oder nachzuverfolgen. In dieser Hinsicht ist die Erfindung grundsätzlich offen und richtet sich gleichermaßen auf mögliche Datierungen von Presswerkzeugen, Qualitätsbeurteilungen aufgrund der erzeugten Markierungen oder die Nachverfolgung des Presswerkzeugtyps und Ähnliches. Hierauf wird später noch näher eingegangen.On the other hand, there is the possibility B. to document or trace the quality and/or authenticity of the pressing or the correct or sufficiently up-to-date pressing tool for the press fitting. In this respect, the invention is fundamentally open and is aimed equally at possible dating of pressing tools, quality assessments based on the markings produced or the tracking of the pressing tool type and the like. This will be discussed in more detail later.

Oben und im Folgenden wird von einem Pressteil des Presswerkzeugs geschrieben, womit der für die eigentliche Verpressung zuständige Abschnitt gemeint ist. Das entspricht der Übersichtlichkeit halber dem Sprachgebrauch in der bereits zitierten EP 3 090 834 A1 , in der zusätzlich von Führungsteilen die Rede ist (die für die vorliegende Erfindung nicht notwendig, aber durchaus denkbar sind). Wie bereits erwähnt hat ein solches Pressteil im hier relevanten Bereich gewöhnlich ungefähr eine Keilform und sind im Regelfall zwei Pressteile an einander zugewandten und bei der Pressbewegung aufeinander zu bewegten Presswerkzeughälften vorgesehen.Above and below, a pressing part of the pressing tool is mentioned, which means the section responsible for the actual pressing. For the sake of clarity, this corresponds to the language used in the already cited EP 3 090 834 A1 , which also mentions guide parts (which are not necessary for the present invention, but are certainly conceivable). As already mentioned, such a pressed part usually has approximately the shape of a wedge in the area relevant here and, as a rule, two pressed parts are provided on pressing tool halves that face one another and are moved towards one another during the pressing movement.

Die Markiereinrichtung ist, um eine Markierung an dem zylindrischen Teil des Pressfittings anzubringen, an einer diesem im Pressbetrieb zugewandten Seite vorgesehen. Üblicherweise werden die Presslaschen bei sogenannten Oetiker-Fittingen so verpresst, dass das Presswerkzeug die Presslasche und nicht den zylindrischen Teil des Fittings umgreift. Dann entspricht diese Seite des Pressteils (oder der Pressteile) einer Außenseite. Es wäre im Rahmen der Erfindung aber im Prinzip durchaus denkbar, wenngleich nicht bevorzugt, die Presslasche auch von der anderen Seite her zu verpressen, also dabei den zylindrischen Teil und die Leitung zu umgreifen. Dementsprechend würde dann die Markiereinrichtung auf der Innenseite liegen.The marking device is provided on a side facing the cylindrical part of the press fitting during the pressing operation in order to apply a marking to it. Usually, the press lugs in so-called Oetiker fittings are pressed in such a way that the pressing tool grips the press lug and not the cylindrical part of the fitting. Then this side of the stamping (or stampings) corresponds to an outside. In principle, however, it would be quite conceivable within the scope of the invention, albeit not preferred, to also press the press tab from the other side, ie to encompass the cylindrical part and the line. Accordingly, the marking device would then be on the inside.

Das Verpressen des Pressfittings betrifft bei Oetiker-Presslaschen deren Fuß und führt dazu, dass diese im verpressten Zustand am Fuß in Umfangsrichtung schmaler als ein bezüglich des zylindrischen Teils des Pressfittings weiter außen liegender Teil der Presslasche sind.The pressing of the press fitting affects the foot of Oetiker press lugs and results in the foot being narrower in the circumferential direction in the pressed state than one further outward in relation to the cylindrical part of the press fitting lying part of the press flap.

Vorzugsweise ist die Markierung an dem Pressfitting benachbart zu dem Fuß der Presslasche, also einem an den zylindrischen Teil anschließenden bzw. dem zylindrischen Teil zugewandten Abschnitt der Presslasche, vorgesehen, und zwar in solcher Weise, dass die verpresste Presslasche die Markierung zumindest teilweise überragt. Dabei wird auf eine radiale Projektion abgestellt (in Bezug auf die Zylinderform des zylindrischen Teils).Preferably, the marking on the press fitting is provided adjacent to the foot of the press tab, i.e. a section of the press tab adjoining the cylindrical part or facing the cylindrical part, in such a way that the pressed press tab marks the marking at least partially towers over This is based on a radial projection (in relation to the cylindrical shape of the cylindrical part).

Vorzugsweise ist zumindest ein Vorsprung der Markiereinrichtung vorgesehen und vorzugsweise weist die Markiereinrichtung keine Ausnehmung auf. Dementsprechend hinterlässt die Markiereinrichtung gemäß dieser Ausgestaltung eine Vertiefung und vorzugsweise keine Ausbeulung oder Ähnliches. Nach den Erfahrungen der Erfinder sind solche Markierungen deutlicher und ist deren Erzeugung beim Verpressvorgang zuverlässiger.At least one projection of the marking device is preferably provided and the marking device preferably has no recess. Accordingly, the marking device according to this embodiment leaves a depression and preferably no bulge or the like. According to the inventors' experience, such markings are clearer and their production during the pressing process is more reliable.

Wie erwähnt weisen die Pressteile typischerweise eine Keilform auf und sind deswegen an den hier betrachteten Stellen eher flach, dabei aber nicht zwingend plan. Im Zweifel definieren sich ein Vorsprung bzw. eine Ausnehmung im obigen Sinn als lokale konvexe oder konkave Abweichung von einer die Umgebung der entsprechenden Oberfläche des Pressteils bestimmenden Form. Wenn eine Mehrzahl von Vorsprüngen und/oder Ausnehmungen vorgesehen ist, kann sich eine Wellenform oder Ähnliches ergeben. Dann definieren sich die Vorsprünge bzw. Ausnehmungen dementsprechend gegenüber einer quasi einen Mittelwert bildenden geglätteten Fläche. Wenn zwischen einer Mehrzahl Vorsprünge keine Vertiefung gegenüber Flächenbereichen außerhalb dieser Mehrzahl Vorsprünge existiert, wird ein Bereich zwischen z. B. zwei Vorsprüngen nicht als Ausnehmung betrachtet.As mentioned, the pressed parts typically have a wedge shape and are therefore rather flat at the points considered here, but not necessarily flat. In case of doubt, a projection or a recess in the above sense is defined as a local convex or concave deviation from a shape that determines the area surrounding the corresponding surface of the pressed part. If a plurality of projections and/or recesses are provided, a wavy shape or the like may result. The projections or recesses are then defined accordingly in relation to a smoothed surface that forms a quasi-average value. When there is no recess between a plurality of projections against areas outside of these plurality of projections, an area between e.g. B. two projections are not considered as a recess.

Weiterhin ist bevorzugt, an beiden Pressteilen des Presswerkzeugs für die Erzeugung einer Markierung zu sorgen, sodass die Markiereinrichtung sich auf beide Pressteile bezieht. Ferner ist bevorzugt, dass es keine zusätzlichen Markierungen, insbesondere nicht auf der dem zylindrischen Teil des Fittings zugewandten Seite der Presslasche oder sonst an der Presslasche gibt.Furthermore, it is preferred to ensure that a marking is produced on both pressing parts of the pressing tool, so that the marking device relates to both pressing parts. Furthermore, it is preferred that there are no additional markings, in particular not on the side of the press tab facing the cylindrical part of the fitting or otherwise on the press tab.

Vorzugsweise sind pro Pressteil mindestens zwei und besonders bevorzugterweise zwei oder drei Vorsprünge vorgesehen. Eine Mehrzahl Vorsprünge erhöht einerseits die Sicherheit und Erkennbarkeit. Wenn beispielsweise aus Gründen irgendeiner Unregelmäßigkeit eine Markierung nicht ganz regelmäßig gelingt, so gibt es dann noch mindestens eine weitere. Andererseits vermeidet man vorzugsweise allzu komplexe Strukturen und reichen aus der Einschätzung der Erfinder normalerweise drei Vorsprünge aus.Preferably, at least two and particularly preferably two or three projections are provided per pressed part. A plurality of projections increases security and visibility on the one hand. For example, if for reasons some irregularity a marking does not succeed quite regularly, then there is at least one more. On the other hand, overly complex structures are preferably avoided and, in the inventors' estimation, three projections are normally sufficient.

Die Vorsprünge können vorzugsweise einen gewissen Mindestabstand voneinander einhalten, und zwar in der Breitenrichtung des Pressteils. Dieser Richtung entspricht der axialen Richtung des zylindrischen Teils und steht senkrecht zur Richtung der Verpressbewegung. Wenn dieser Mindestabstand 20 % oder vorzugsweise sogar 25 %, 30 % oder gar 35 % der gesamten Pressteilbreite in dieser Richtung ausmacht, können besonders deutlich erkennbare und voneinander getrennte Markierungen erzeugt werden.The projections may preferably keep a certain minimum distance from each other in the width direction of the stamping. This direction corresponds to the axial direction of the cylindrical part and is perpendicular to the direction of the pressing movement. If this minimum distance makes up 20% or preferably even 25%, 30% or even 35% of the entire width of the pressed part in this direction, markings which are particularly clearly recognizable and separate from one another can be produced.

Um die Markierungen benachbart zu dem Fuß der Presslasche anbringen zu können, sind die Vorsprünge oder Ausnehmungen vorzugsweise direkt an einer entsprechenden Vorderkante des oder der Pressteile vorgesehen, also hinsichtlich der Pressrichtung vorn. Vorzugsweise ist dies gemäß zumindest einem der beiden folgenden Kriterien der Fall. Betrachtet man den Pressteil in einer Schnittebene senkrecht zur axialen Richtung (des zylindrischen Teils), so bildet die beschriebene Vorderkante eine konvexe Zone. Die Vorsprünge bzw. Ausnehmungen sollen dementsprechend zumindest teilweise in dieser konvexen Zone liegen.In order to be able to apply the markings adjacent to the foot of the pressing tab, the projections or recesses are preferably provided directly on a corresponding front edge of the pressing part or parts, ie at the front with regard to the pressing direction. This is preferably the case according to at least one of the two following criteria. Observing the pressing part in a sectional plane perpendicular to the axial direction (of the cylindrical part), the front edge described forms a convex zone. Accordingly, the projections or recesses should lie at least partially in this convex zone.

Die zweite mögliche Definition bezieht sich auf die Dicke des Pressteils in seinem vorderen Bereich. Diese Dicke soll am Ende der beschriebenen konvexen Zone definiert sein und die Vorsprünge oder Ausnehmungen sollen vorzugsweise zumindest teilweise innerhalb eines Abstands von der vordersten Stelle aus gemessen liegen.The second possible definition relates to the thickness of the pressing in its front area. This thickness shall be defined at the end of the convex zone described and the projections or recesses shall preferably be at least partly within a distance measured from the foremost point.

Für beide Kriterien gilt, dass andere Teile der Vorsprünge oder Markierungen über die beschriebenen Bereiche hinausragen können. Generell ist eine langgestreckte Form insbesondere der Vorsprünge bevorzugt, weil sie damit im Hinblick auf die typischerweise bei den Verpressvorgängen auftretenden Kräfte relativ stabil sind.For both criteria, other parts of the projections or markings can protrude beyond the areas described. In general, an elongated shape is preferred, especially for the projections, because they are relatively stable with regard to the forces that typically occur during the pressing processes.

"Langgestreckt" bedeutet, dass die größte Abmessung der Vorsprünge entlang der Pressrichtung liegt."Elongated" means that the largest dimension of the protrusions is along the pressing direction.

Dabei ist ferner bevorzugt, dass die Vorsprünge mit einer in diesem Sinn lang gestreckten Form vorn ausgeprägter (also "höher") sind als in einem hinteren Bereich. Der hintere Bereich dient dann eher zur Stützung.It is also preferred that the projections, with an elongated shape in this sense, are more pronounced (ie “higher”) at the front than in a rear area. The rear area is then used more for support.

Vorzugsweise werden mit den Markierungen bzw. Markiereinrichtungen (mindestens) verschiedene Presswerkzeuggrößen, also Auslegungen für verschieden große Pressfittinge, unterschieden. Zusätzlich oder alternativ werden vorzugsweise Presswerkzeuge dahingehend von einander unterschieden, ob sie für eine motorische oder für eine handbetätigte Verpressung ausgelegt sind. Beides kommt in der Praxis vor und normalerweise liegen sowohl an handbetätigten Presseinrichtungen als auch an motorischen jeweils auswechselbare Presswerkzeuge vor, wobei diese typischerweise nicht untereinander zu vertauschen sind. Man kann dann mit einer entsprechenden Markierung nachverfolgen, ob ein möglicherweise undichter Fitting per Hand oder motorisch verpresst wurde, was wegen der etwas höheren Fehleranfälligkeit von Handverpressungen von Interesse sein kann. Alternativ oder zusätzlich kann man auch nachverfolgen, ob die zu dem Fitting passende Presswerkzeuggröße eingesetzt wurde oder möglicherweise eine ungeeignete.Preferably, the markings or marking devices are used to distinguish (at least) different press tool sizes, ie designs for press fittings of different sizes. Additionally or alternatively, pressing tools are preferably differentiated from one another as to whether they are designed for motorized or manually operated pressing. Both occur in practice and normally there are interchangeable pressing tools both on manually operated pressing devices and on motorized pressing tools, with these typically not being interchangeable. You can then use a corresponding marking to track whether a possibly leaking fitting was pressed manually or by motor, which can be of interest because manual pressings are somewhat more prone to errors. Alternatively or additionally, you can also track whether the right pressing tool size for the fitting was used or possibly an unsuitable one.

Natürlich lässt sich vorzugsweise auch (oder stattdessen) durch die Markierung die Benutzung von Original-Presswerkzeugen nachvollziehen, also solchen, die der Hersteller des Pressfittings für die Verpressung freigegeben hat. Solche Fragen sind im Hinblick auf mögliche Gewährleistungsdiskussionen bei Schadensfällen durchaus wichtig und sie dienen außerdem bei Schadensfällen der Fehlerrückverfolgung, also letztlich dem Hinzugewinnen von Erfahrungen und dem Fortschritt. Dementsprechend bezieht sich die Erfindung auch auf einen Satz von unterschiedliche Markiereinrichtungen aufweisenden Presswerkzeugen, in dem sich diese Presswerkzeuge also hinsichtlich der erzeugten Markierungen voneinander unterscheiden lassen.Of course, the use of original pressing tools can preferably also (or instead) be traced through the marking, i.e. those that the manufacturer of the press fitting has released for pressing. Such questions are very important with regard to possible warranty discussions in the event of damage and they also serve to trace errors in the event of damage, i.e. ultimately to gain experience and progress. Accordingly, the invention also relates to a set of pressing tools having different marking devices, in which these pressing tools can thus be distinguished from one another with regard to the markings produced.

Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Dazu zeigen die Figuren das Ausführungsbeispiel wie folgt:

Figur 1
zeigt in perspektivischer Darstellung ein Presswerkzeug nach dem Stand der Technik;
Figur 2
zeigt in analoger perspektivischer Darstellung ein erfindungsgemäßes Presswerkzeug;
Figur 3
entspricht Figur 2, zeigt jedoch ein für größere Fittinge und größere Leitungsdimensionen ausgelegtes Presswerkzeug;
Figur 4
zeigt eine Vorderkante und den anschließenden Teil eines Pressteils des Presswerkzeugs aus Figur 2 in perspektivischer Darstellung;
Figur 5
entspricht Figur 4, ist aber eine Seitenansicht in axialer Richtung, und
Figur 6
ist eine entsprechende Aufrissdarstellung in Pressrichtung.
The invention is explained in more detail below using an exemplary embodiment. The figures show the exemplary embodiment as follows:
figure 1
shows a perspective view of a press tool according to the prior art;
figure 2
shows a pressing tool according to the invention in an analogous perspective view;
figure 3
is equivalent to figure 2 , but shows a pressing tool designed for larger fittings and larger pipe dimensions;
figure 4
Figure 12 shows a front edge and the subsequent part of a pressing part of the pressing tool figure 2 in perspective view;
figure 5
is equivalent to figure 4 , but is a side view in the axial direction, and
figure 6
is a corresponding elevation view in the pressing direction.

Figur 1 zeigt den Stand der Technik, nämlich ein Presswerkzeug gemäß der bereits zitierten EP 3 090 835 A1 , vergleiche dort Figur 6. Dieses konventionelle Presswerkzeug zeigt zwei um jeweilige Drehachsbolzen 16' schwenkbare Pressteile 15', wobei in Figur 1 unter und über den Pressteilen 15' Führungsteile 18' angeordnet sind, deren Form, Funktion und Bewegungen in der zitierten Anmeldung und auch in der EP 3 090 834 A1 näher beschrieben sind. figure 1 shows the prior art, namely a pressing tool according to the already cited EP 3 090 835 A1 , compare there figure 6 . This conventional pressing tool shows two pressing parts 15' that can be pivoted about respective pivot pins 16', wherein in figure 1 are arranged under and above the pressing parts 15 'guide parts 18', the form, function and movements in the cited application and also in the EP 3 090 834 A1 are described in more detail.

Zwischen den Pressteilen 15' und den Führungsteilen 18' befinden sich jeweils Platten 30', die an den Bewegungen der Pressteile 15' und der Lagerteile 18' nicht teilnehmen und dabei die Drehachsbolzen 16' halten, wobei die Lagerachsbolzen 16' jeweils außerhalb der Führungsteile 18' mit gängigen Sprengringen gesichert sind. Über diese Platten 30' können die manuellen oder motorischen Antriebe an dem Werkzeug angeschlossen werden, die die in Figur 1 nach rechts hinten abstehenden Schenkel 14' in Verlängerung der Pressteile 15' und (in der im Stand der Technik schon beschriebenen Weise) über die Pressteile 15' mittels der Stifte 20' auch die Führungsteile 18' bewegen.Between the pressing parts 15' and the guide parts 18' are plates 30', which do not participate in the movements of the pressing parts 15' and the bearing parts 18' and thereby hold the pivot pins 16', with the bearing axle pins 16' being outside of the guide parts 18 ' secured with standard snap rings are. The manual or motorized drives can be connected to the tool via these plates 30', which figure 1 Legs 14' protruding to the right to the rear as an extension of the pressing parts 15' and (in the manner already described in the prior art) also move the guide parts 18' via the pressing parts 15' by means of the pins 20'.

Figur 2 zeigt eine analoge Ansicht eines erfindungsgemäßen Ausführungsbeispiels, wobei hier und im Folgenden zu den zitierten Dokumenten analoge Bezugszeichen verwendet werden und zur Unterscheidung die Bezugszeichen in Figur 1 jeweils ein Apostrophzeichen nach der Zahl enthalten und in den Figuren 2 bis 6 nicht. figure 2 shows an analogous view of an exemplary embodiment according to the invention, reference numerals analogous to the cited documents being used here and in the following, and the reference numerals in FIG figure 1 each contain an apostrophe after the number and in the Figures 2 to 6 Not.

Figur 2 zeigt anschaulich, dass der dem Pressfitting zugewandte vordere Bereich des Presswerkzeugs, also der in Figur 2 nach links vorn/unten zeigende Bereich, im Wesentlichen dem vorgeschriebenen Presswerkzeug entspricht. Gleichzeitig sind die Platten 30' aus dem zitierten Stand der Technik ersetzt durch außerhalb der Führungsteile 18 liegende Abdeckplatten 30. Diese Abdeckplatten erfassen in einer Projektion entlang der Leitungsrichtung, also parallel zur Drehachsenrichtung, den allergrößten Teil der Führungsteile 18, nämlich deren gesamte Erstreckung in der Breitenrichtung (in Figur 2 von links oben nach rechts unten) und jedenfalls den größten Teil in der Längsrichtung (in Figur 2 von links unten nach rechts oben). Dadurch können die Abdeckplatten 30 Schläge und Stöße in diesem Überlappungsbereich abfangen, wobei sie ersichtlich relativ kräftig aus technischem Kunststoff oder Metall, insbesondere Feinguss, ausgeführt und damit vergleichsweise unempfindlich sind. Dies wird in einer parallelen Anmeldung näher ausgeführt. figure 2 clearly shows that the front area of the pressing tool facing the press fitting, i.e. the in figure 2 area pointing to the left in front/below, essentially corresponds to the prescribed pressing tool. At the same time, the plates 30' from the cited prior art are replaced by cover plates 30 located outside the guide parts 18. In a projection along the direction of the line, i.e. parallel to the direction of the axis of rotation, these cover plates cover the vast majority of the guide parts 18, namely their entire extent in the Latitude (in figure 2 from top left to bottom right) and at least most of it in the longitudinal direction (in figure 2 from bottom left to top right). As a result, the cover plates 30 can absorb blows and impacts in this overlapping area, and they are evidently made of relatively strong technical plastic or metal, in particular investment casting, and are therefore comparatively insensitive. This is explained in more detail in a parallel application.

Für die vorliegende Beschreibung wichtig sind die in Figur 2 bereits gut erkennbaren und in den Figuren 4 bis 6 näher dargestellten Markiereinrichtungen, nämlich die beiden Vorsprünge 33. Diese liegen an einer dem zylindrischen Teil eines zu verpressenden Pressfittings zugewandten Seite des Presswerkzeugs und konkret der Pressteile 15, und zwar jeweils paarweise und hinsichtlich der axialen Richtung symmetrisch sowie voneinander beabstandet. Mit diesen Vorsprüngen 33 hinterlässt das Presswerkzeug beim Verpressen charakteristische Vertiefungen an der Presslasche mit den bereits vorstehend ausgeführten Funktionen.Important for the present description are in figure 2 already well recognizable and in the Figures 4 to 6 Marking devices shown in more detail, namely the two projections 33. These lie on a side of the pressing tool and specifically the pressing parts 15 facing the cylindrical part of a press fitting to be pressed, in pairs and with respect to the axial direction symmetrical and spaced apart. With these projections 33, the pressing tool leaves characteristic indentations on the pressing tab with the functions already explained above during pressing.

Beim Greifen einer Presslasche würde man ja zunächst mit dem Vorderbereich des Presswerkzeugs die Presslasche umfassen, dann eine Schließbewegung durchführen, sodass die Führungsteile eine korrekte Positionierung zwischen dem Pressfitting und seiner Presslasche einerseits und andererseits dem Presswerkzeug herbeiführen, woraufhin dann die eigentliche Verpressung stattfindet. Das ist ausführlich in den zitierten früheren Anmeldungen beschrieben.When gripping a press lug, one would first grasp the press lug with the front area of the pressing tool, then perform a closing movement so that the guide parts bring about correct positioning between the press fitting and its press lug on the one hand and the pressing tool on the other, whereupon the actual pressing then takes place. This is described in detail in the earlier applications cited.

Man kann sich zusammen mit den Illustrationen dieser früheren Anmeldungen dann leicht vorstellen, dass die Vorsprünge 33 jedenfalls in einer Schlussphase der Verpressbewegung in einen kraftschlüssigen Kontakt mit der Presslasche kommen und zum Schluss in radialer Richtung (bzgl. des zylindrischen Pressfittingteils) in diese Presslasche hineingedrückt werden und dementsprechend eine Markierung hinterlassen.Together with the illustrations of these earlier applications, it is then easy to imagine that the projections 33 come into frictional contact with the press lug, at least in a final phase of the pressing movement, and are finally pressed into this press lug in the radial direction (with respect to the cylindrical press fitting part). and leave a mark accordingly.

Zur vergleichenden Illustration zeigt Figur 3 ein größeres Presswerkzeug für einen größeren Pressfitting, also größere Leitungsdurchmesser. Im Übrigen sind die dargestellten Presswerkzeuge aber durch eine nicht dargestellte und an sich vorbekannte Antriebseinrichtung motorisch zu betätigen. Sie könnten alternativ auch mit einer ebenfalls an sich vorbekannten Handantriebseinrichtung als Presszange benutzt werden. Das ist für die vorliegende Erfindung und die Markiereinrichtungen sekundär, allerdings können die Markierungen zur Unterscheidung von Presswerkzeugen und auch zur Unterscheidung zwischen motorischen und Handantrieben sowie natürlich zur Unterscheidung zwischen verschiedenen Herstellungszeiträumen von Presswerkzeugen benutzt werden.For comparative illustration shows figure 3 a larger pressing tool for a larger press fitting, i.e. larger cable diameters. In other respects, however, the pressing tools shown can be motor-actuated by a drive device which is not shown and is already known per se. Alternatively, they could also be used as pressing tongs with a manual drive device that is also known per se. This is secondary to the present invention and the marking devices, however the markings can be used to distinguish between dies and also to distinguish between powered and manual drives and of course to distinguish between different periods of manufacture of dies.

Außerdem finden sich in den zitierten Voranmeldungen ausführliche Erläuterungen zur Funktionsweise der Presswerkzeuge mit einem passenden Pressfitting, konkret einem Oetiker-Fitting, wobei auch die Wechselwirkung des Presswerkzeugs mit einem an dem Pressfitting angebrachten Indikator dargestellt ist, der beim Verpressen durch das Presswerkzeug von dem Pressfitting abgeclipst und durch auch bei der vorliegenden Erfindung deutlich sichtbare Auswurföffnungen, hier mit dem Bezugszeichen 32, seitlich ausgeworfen werden kann.In addition, detailed explanations of the functioning of the pressing tools with a suitable press fitting, specifically an Oetiker fitting, can be found in the previous applications cited, with the interaction of the pressing tool also being explained is shown with an indicator attached to the press fitting, which can be clipped off the press fitting during pressing by the pressing tool and ejected laterally through ejection openings, here with the reference number 32, which are also clearly visible in the present invention.

Die Figuren 4 bis 6 zeigen eines der beiden Pressteile 15 aus Figur 2, und zwar dessen vorderen Bereich mit der in den Figuren 4 und 5 nach rechts und in Figur 6 nach vorn weisenden Vorderkante 34. In den Figuren sind dabei Hilfslinien eingezeichnet, die insbesondere konkave von konvexen Bereichen bzw. von geraden Bereichen trennen und damit die Geometrie veranschaulichen. In den Figuren 5 und 6 sind zusätzlich noch zwei geometrische Maße bezeichnet.the Figures 4 to 6 show one of the two pressing parts 15 figure 2 , namely its front area with in the figures 4 and 5 to the right and in figure 6 front edge 34 pointing forward. Auxiliary lines are drawn in the figures, which in particular separate concave from convex areas or from straight areas and thus illustrate the geometry. In the figures 5 and 6 two additional geometric dimensions are indicated.

In Figur 4 und 5 erkennt man, dass die beiden Vorsprünge 33 deutlich innerhalb einer die Vorderkante 34 bildenden konvexen Zone beginnen und am in den Figuren oberen Ende dieser konvexen Zone bereits ihre größte Höhe (ungefähr in der vertikalen Richtung der Figuren) erreicht haben. Von dort aus fallen die Vorsprünge 33 jeweils vergleichsweise langsamer, also über eine längere Strecke in Pressrichtung, ab. Sie befinden sich dabei nicht nur teilweise, sondern ausschließlich auf der in den Figuren 2 und 3 nach links vorn, also auf den Pressfitting zu, und in den Figuren 4 bis 6 nach oben weisenden Außenseite des Pressteils 15.In figure 4 and 5 it can be seen that the two projections 33 clearly begin within a convex zone forming the front edge 34 and have already reached their greatest height (approximately in the vertical direction of the figures) at the upper end of this convex zone in the figures. From there, the projections 33 each fall off comparatively more slowly, ie over a longer distance in the pressing direction. You are not only partially, but exclusively on the in the figures 2 and 3 to the left in front, ie towards the press fitting, and into the Figures 4 to 6 upward-pointing outside of the pressing part 15.

Sie sind außerdem nicht noch an der Vorderkante 34 im engsten Sinn vorhanden, also der in Figur 5 ganz rechts liegenden Mittellinie der konvexen Zone, die bei der Pressbewegung am weitesten vorn liegt, angeordnet, sondern im Sinn der Pressrichtung etwas dahinter. Damit erzeugen sie Markierungen am zylindrischen Teil der metallischen Spannzange (der Blechstreifen des Fittings, vergleiche die Darstellungen des Pressfittings in den zitierten Voranmeldungen) und eventuell geringfügig noch im Übergang dieses zylindrischen Teils in die Presslasche. Sie beeinträchtigen aber nicht den eigentlich für die Befestigungs- und Dichtwirkung des verpressten Fittings relevanten Teil, nämlich die von dem zylindrischen Teil entfernten Teile der Presslasche. Die Versuche und Überlegungen der Erfinder haben ergeben, dass Markierungen dort nachteilig für die Ausbildung der gewünschten Form der verpressten Presslasche und damit letztlich für die Verlässlichkeit des verpressten Pressfittings sein können.They are also not present on the leading edge 34 in the narrowest sense, i.e. the in figure 5 on the far right center line of the convex zone, which is furthest in front of the pressing movement, but somewhat behind it in the sense of the pressing direction. In doing so, they create markings on the cylindrical part of the metal collet (the sheet metal strip of the fitting, compare the representations of the press fitting in the previous applications cited) and possibly also slightly in the transition of this cylindrical part into the press lug. However, they do not impair the part that is actually relevant for the fastening and sealing effect of the pressed fitting, namely the parts of the press tab that are removed from the cylindrical part. The experiments and considerations of the inventors have shown that markings there are disadvantageous for the formation of the desired Shape of the pressed press tab and thus ultimately for the reliability of the pressed press fitting.

In den Figuren ist das obere und untere Ende der konvexen Zone mit Hilfslinien bezeichnet. Außerdem sieht man in Figur 5 eine weiter vorn in der Beschreibung bereits benutzte geometrische Größe, nämlich die Dicke des Pressteils am Ende der konvexen Zone, hier mit d benannt. Es wurde bereits festgehalten, dass die Markiereinrichtungen vorzugsweise zumindest teilweise innerhalb 30 % von der vordersten Stelle in der Pressrichtung aus liegen (hier also von der Vorderkante 34 aus), wobei sich die 30 % auf die Dicke d beziehen.In the figures, the upper and lower ends of the convex zone are indicated with auxiliary lines. In addition, you can see figure 5 a geometric quantity already used earlier in the description, namely the thickness of the pressed part at the end of the convex zone, denoted here by d. It has already been stated that the markers are preferably at least partially within 30% of the foremost point in the pressing direction (ie here from the leading edge 34), the 30% relating to the thickness d.

Die Figuren zeigen ferner, dass die Markiereinrichtung hier ausschließlich aus Vorsprüngen 33 ohne Ausnehmung besteht, wobei an jedem Pressteil 15 jeweils zwei Vorsprünge 33 vorgesehen sind. Diese Vorsprünge 33 sind, wie Figur 6 zeigt, deutlich voneinander beabstandet, hier um ein Drittel der Gesamtbreite b des Pressteils 15 in der Axialrichtung. Damit können die erzeugten Markierungen deutlich voneinander getrennt wahrgenommen werden, bleiben in ihren Auswirkungen hinsichtlich der plastischen Verformung voneinander unabhängig und es besteht außerdem Spielraum, durch unterschiedliche solche Abstände oder auch unterschiedliche Zahlen von Vorsprüngen Aussagen über das Presswerkzeug hinsichtlich seiner Größe, seines Alters, seines Antriebs oder Ähnlichem zu machen. Insoweit ergibt die Erfindung besonderen Sinn in einem System oder Satz von Werkzeugen, die dementsprechend systematisch unterschiedliche Markiereinrichtungen zur Erzeugung dementsprechend unterschiedlicher Markierungen in den verpressten Pressfittingen aufweisen.The figures also show that the marking device here consists exclusively of projections 33 without a recess, with two projections 33 being provided on each pressing part 15 . These projections 33 are like figure 6 12, clearly spaced from each other, here by a third of the total width b of the pressing part 15 in the axial direction. The markings produced can thus be perceived clearly separately from one another, remain independent of one another in their effects with regard to plastic deformation and there is also leeway to make statements about the pressing tool with regard to its size, age and drive through different such distances or also different numbers of projections or something similar to do. In this respect, the invention makes particular sense in a system or set of tools which accordingly systematically have different marking devices for producing correspondingly different markings in the pressed press fittings.

Außerdem zeigen die Figuren zusammen und auch Figur 4 für sich, dass die Vorsprünge 33 langgestreckt sind, also in der Pressrichtung deutlich länger als breit (gemäß Figur 6) und hoch (gemäß Figur 5). Sie sind damit einerseits konzentriert (Breite) und beschränken sich auf eine lokalisierte Markierung. Andererseits sind sie stabil, weil langgestreckt und nicht zu hoch, sodass sie eine große Zahl von Pressvorgängen ohne wesentliche Veränderung überstehen können. Dazu trägt natürlich auch die verrundete Form gemäß Figur 4 bei. Man erkennt vor allem in Figur 5, dass die in diesem Sinn höchste Stelle bzgl. der Längserstreckung der Vorsprünge 33 nicht mittig, sondern deutlich vorn liegt; der langgestreckte "hintere" Teil stützt diese vordere Erhebung.In addition, the figures show together and also figure 4 for itself that the projections 33 are elongated, i.e. significantly longer than wide in the pressing direction (according to figure 6 ) and high (according to figure 5 ). On the one hand, they are concentrated (width) and limited to a localized marking. On the other hand, they are stable because they are elongated and not too high, so that they can withstand a large number of pressing processes without any significant change. contributes to this of course also the rounded shape accordingly figure 4 at. One recognizes above all in figure 5 that in this sense the highest point with respect to the longitudinal extent of the projections 33 is not in the middle but is clearly in front; the elongated "back" portion supports this front elevation.

Vorzugsweise sind die Vorsprünge 33 einstückig und integral in einem die Pressteile 15 erzeugenden Formgebungsverfahren hergestellt und bestehen daher aus dem gleichen Material wie der Rest der Pressteile 15. In Betracht kommen geschmiedete Metallteile, aber auch Hartmetalleinsätze.The projections 33 are preferably made in one piece and integrally in a shaping process that produces the pressing parts 15 and therefore consist of the same material as the rest of the pressing parts 15. Forged metal parts but also hard metal inserts can be used.

Claims (11)

  1. A press tool for a fitting for attaching a hose or tube conduit to another part, said fitting having a cylindrical part and, protruding therefrom, a press lug to be pressed plastically in a direction perpendicular to an axial direction of the cylindrical part of the fitting in order to clamp the cylindrical part and press it onto the conduit,
    wherein the press tool has two tool halves (14, 15, 18) which can be closed by means of a movement towards each other and opened by means of a movement away from each other,
    said tool halves having a respective press part (15) for the pressing of the press lug during the closing movement,
    wherein parts of the press parts (15) which are facing each other and located at the front, in respect of the press movement of the press tool, are wedge-shaped and designed so as to engage a foot of the press lug facing the cylindrical part of the fitting and to compress it during the press movement and thus plastically deform the press lug,
    characterised by a marking device in the form of at least one projection (33) and/or at least one recess on at least one of the press parts (15),
    and namely on a side of the press part (15) facing the cylindrical part of the press fitting.
  2. The press tool in accordance with claim 1, wherein the marking device has at least one projection (33) and preferably no recess.
  3. The press tool in accordance with claim 1 or 2, wherein the marking device is provided on both press parts (15).
  4. The press tool in accordance with one of the preceding claims, wherein the marking device has at least two projections (33) per press part (15).
  5. The press tool in accordance with claim 4, wherein the projections (33), in the axial direction of the cylindrical part of the press fitting, in other words the direction of a width (b) of the press part (15), are spaced at a distance of at least 20% of that width.
  6. The press tool in accordance with one of the preceding claims, wherein the projection(s) (33) or the recess(es) is (are) arranged directly on a front edge (34), in respect of the press direction of the press part(s) (15), such that they are located at least partially in a convex area, relative to a sectional plane perpendicular to the axial direction of the cylindrical part of the press fitting, on the front of the press part (15) in respect of the press direction.
  7. The press tool in accordance with one of the preceding claims, wherein the projection(s) (33) or recess(es) is (are) arranged directly on a front edge (34), in respect of the press direction of the press part (15), such that they are located at least partially within 30% of the thickness (d) of the press part (15) in respect of the press direction, on the front, starting from the front-most location, as viewed in the press direction, wherein the thickness (d) is located at an end of a convex area on the front of the press part (15) in respect of the press direction.
  8. The press tool in accordance with claim 2, optionally in conjunction with another of the preceding claims, wherein the projection(s) (33) has (have) an elongated form in respect of the press direction.
  9. The press tool in accordance with claim 8, wherein the projection(s) (33) is (are) more pronounced in a direction perpendicular to the press direction and perpendicular to the axial direction of the cylindrical part of the press fitting in a front part of the projection(s) (33) in respect of the press direction than in a rear part of the projection(s) (33).
  10. A set of press tools, each in accordance with one of the preceding claims, wherein the respective marking devices of the press tools differ from each other in that the resulting markings created on the press fittings are different and wherein the press tools also differ from each other in respect of their configuration for press fitting sizes and/or their configuration for motor-assisted or manually actuated compressions.
  11. Use of a press tool or set of press tools in accordance with one of the preceding claims for compressing a press fitting, which press fitting has a cylindrical part and a press lug protruding therefrom and said press lug is to be pressed plastically in a direction perpendicular to an axial direction of the cylindrical part of the fitting during said compressing in order to clamp the cylindrical part, wherein the marking device leaves a visible marking on the press fitting which presents as a plastic deformation whose shape is specific to the marking device.
EP19167574.3A 2019-04-05 2019-04-05 Press tool with marking for a fitting with press tab Active EP3718696B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19167574.3A EP3718696B1 (en) 2019-04-05 2019-04-05 Press tool with marking for a fitting with press tab

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19167574.3A EP3718696B1 (en) 2019-04-05 2019-04-05 Press tool with marking for a fitting with press tab

Publications (2)

Publication Number Publication Date
EP3718696A1 EP3718696A1 (en) 2020-10-07
EP3718696B1 true EP3718696B1 (en) 2022-11-02

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299012A (en) * 1979-05-08 1981-11-10 Hans Oetiker Hose clamp

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1274068A (en) * 1984-06-20 1990-09-18 Hans Oetiker Deformable ear for clamps
DE19620165C1 (en) 1996-05-08 1997-10-16 Mannesmann Ag Method and device for producing a pipe press connection
DE10319376B4 (en) 2003-04-30 2007-01-04 Uponor Innovation Ab Press jaw for a pressing tool for pressing fittings, pressing tool and tool for axially pushing a sleeve
US8302283B2 (en) * 2009-12-10 2012-11-06 Bobenhausen Larry F Method and apparatus for connecting a hose to a fitting
EP2341273B1 (en) 2010-01-05 2012-05-09 Geberit International AG Tube clamp
EP2757299B1 (en) 2011-03-11 2021-08-25 Geberit International AG Pipe clamp
EP2607768B1 (en) 2011-12-20 2014-10-01 Geberit International AG Tube clamp
EP2607764B1 (en) 2011-12-23 2015-01-28 Geberit International AG Pipe clamp with connector piece
DK3090834T3 (en) 2015-05-08 2018-10-29 Geberit Int Ag Press tool for a fitting with press lug
EP3090835B1 (en) 2015-05-08 2017-06-07 Geberit International AG Press tool and its use for pressing a fitting
AU2017383094A1 (en) * 2016-12-23 2019-06-27 Construkta World Pty Ltd Crimping jaw, tool and associated method of use
US20180333832A1 (en) * 2017-05-16 2018-11-22 Huo-Meng Technology Co., Ltd. Pipe clamp pliers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299012A (en) * 1979-05-08 1981-11-10 Hans Oetiker Hose clamp

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