EP1531016B1 - Pressing tool - Google Patents

Pressing tool Download PDF

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Publication number
EP1531016B1
EP1531016B1 EP03025943A EP03025943A EP1531016B1 EP 1531016 B1 EP1531016 B1 EP 1531016B1 EP 03025943 A EP03025943 A EP 03025943A EP 03025943 A EP03025943 A EP 03025943A EP 1531016 B1 EP1531016 B1 EP 1531016B1
Authority
EP
European Patent Office
Prior art keywords
pressing
pressing tool
elements
tool
another
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03025943A
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German (de)
French (fr)
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EP1531016A1 (en
Inventor
Hans-Jörg Goop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ridge Tool Co
Original Assignee
Ridge Tool Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to PT03025943T priority Critical patent/PT1531016E/en
Application filed by Ridge Tool Co filed Critical Ridge Tool Co
Priority to ES03025943T priority patent/ES2287400T3/en
Priority to AT03025943T priority patent/ATE364461T1/en
Priority to DE50307476T priority patent/DE50307476D1/en
Priority to EP03025943A priority patent/EP1531016B1/en
Priority to JP2004309169A priority patent/JP4694174B2/en
Priority to CA002486433A priority patent/CA2486433A1/en
Priority to US10/986,164 priority patent/US7146839B2/en
Publication of EP1531016A1 publication Critical patent/EP1531016A1/en
Application granted granted Critical
Publication of EP1531016B1 publication Critical patent/EP1531016B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/048—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods using presses for radially crimping tubular elements
    • 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

Definitions

  • the invention relates to a pressing tool for pressing a receiving part of an installation element on an inserted into the receiving part tube, wherein the pressed-receiving part has a portion with a constant circumferential direction in the circumferential direction within a predetermined shape tolerance, according to the preamble of claim 1 (see, eg DE 93 14 054 U ).
  • the pressing tool For cold forming connecting an installation element - for example a fitting or a fitting - with a pipe, the pressing tool is applied around a receiving part of the installation element. Driving forces are introduced into the pressing tool via a drive device, whereby pressing forces are exerted on the receiving part, into which the tube is inserted, by the pressing tool. Due to the pressing forces of the receiving part is transformed so that the receiving part is permanently connected by an indentation with the inserted tube.
  • a receiving part in addition to at least one Aufpressabêt for forwarding longitudinal and torsional forces on a sealing portion for sealing the connection, whereby such a receiving part can be pressed sealingly on a pipe.
  • a narrow embossing area with a polygonal basic shape is also provided for the mechanical securing of the connection.
  • the sealing of the connection between pipe and installation element is usually via a sealing ring achieved, which is arranged facing the pipe on the inside of the sealing portion of the receiving part.
  • a sealing ring achieved, which is arranged facing the pipe on the inside of the sealing portion of the receiving part.
  • elastic compressive stress of the sealing ring against the pipe and against the receiving part and on the other hand avoiding pinching of the sealing ring is absolutely necessary.
  • Such a uniform compressive stress can only be achieved if, during the pressing-on of the receiving part, the sealing section is deformed circumferentially uniformly within a very specific circumference. Therefore, manufacturers of such installation elements type-specific predetermined shape tolerances, such as roundness or cylinder shape tolerances, given for pressed-receiving parts.
  • the shape tolerances relate in particular to the respective outer shape of the sealing area or possibly also of the entire press-on area.
  • scissors-like pressing tongs are known in practice, among other things, which open at one end like a mouth and at the other end are firmly connected to a drive device.
  • DN usually compression chains or compression rings are used, which must be disconnected at each application to a lovedpressendes installation element of the associated drive device.
  • the crimping tool has two pressing levers, on each of which a substantially rigid pressing jaw is provided at one end, and each of which is pivotable in opposite directions about an axis Connection plates are stored.
  • a substantially cylindrical mold is formed by the two press jaws, which is incorporated into the compact during pressing. Due to the given dimensions of such pressing tongs has been shown in practice that the handling in confined spaces, especially in the production of pipelines for domestic installations, cumbersome and pre-mounted Flttingen near the wall or floor is often not possible.
  • pressing tongs are known in which a special device for monitoring a complete closure of the two pressing jaws is provided.
  • a pressing tool for pressing a receiving part of an installation element on a tube inserted into the receiving part has two pressing elements which are movably connected to one another.
  • the receiving part has at least one section which is shaped in such a way by the pressing-on process, so that the pressed-on section has an outer shape substantially constantly curved in the circumferential direction, which lies within a predetermined shape tolerance, for example a roundness tolerance or a cylinder shape tolerance.
  • Each of the two pressing elements has, on the side facing the respective other pressing element, a pressing region which is assigned to the section.
  • At least one of the two pressing elements is elastically deformable, in particular elastically bendable, in such a way that, under the forces acting on the pressing element and changing during the pressing process, the shape of its pressing region changes.
  • the pressing area exposed in the stationary state of the pressing tool is in the circumferential direction in a shape deviating from the outer shape.
  • the same pressing region is in the circumferential direction in a substantially constant curved shape corresponding to the outer shape, when the pressing region abuts against the section in the pressing-on state of the closed pressing tool.
  • a pressing element according to the invention is no longer practically rigid, but deforms elastically under loads that act on the pressing element during pressing.
  • the elastic deformations which are caused by the driving forces exerted by the connection of the two pressing elements and the mecanicpressenden receiving part on the pressing element forces, targeted in the design of the pressing element, in particular in the shaping of the pressing area, taken into account.
  • the curvature of the pressing area exposed in the stationary state also deviates from the constant curvature of the required outer shape of the pressed-on section. Since in a novel pressing element instead of a high Rigidity elastic deformations are intended to be smaller, slimmer and lighter, press tools can be provided with which receiving parts can be pressed onto pipes whose sections are reproducible within the required shape tolerance.
  • a variable during the pressing process form of the pressing area offers additional possibilities to influence the pressing itself targeted. If the sum of the forming work required for the pressing and the work required for the elastic deformation of the pressing element is distributed as evenly as possible over the path covered by the driving forces during the pressing on when pressing on the receiving part, peak values of the driving forces occurring can be purposefully reduced. On the one hand, the fatigue strength and the long-term dimensional stability of pressing tools can be positively influenced. This also benefits in the dimensioning of such pressing tools are connected. On the other hand, such a pressing tool can also be operated with a less powerful drive device.
  • both pressing elements of a pressing tool in the same way, according to the invention elastically deformable, so that their pressing areas in the closed state of the tool assume a form corresponding to the required outer shape only under the mechanical loads occurring during pressing.
  • both pressing elements are sickle-shaped and connected at one end via a single bearing pin hinged together. At the other end, both pressing elements have an end piece, each with a force introduction region and a stop surface for the block drive of the tool.
  • This embodiment is characterized by a simple design and by a precisely guided movement of the two elastically bendable pressing elements.
  • a receiving part of an installation element in addition to a constant curved portion for a sealing element usually has a further section for non-detachable connection of the installation element with a pipe.
  • a further section for non-detachable connection of the installation element with a pipe For example, with receiving parts of smaller sizes is often another Stamping provided, which is formed into a hexagon.
  • a further section for permanent connection also often has a constant curvature, optionally with a cylindrical shape, in the pressed-on state.
  • a corresponding pressing element has a further pressing region assigned to the further section, in the shaping of which the elastic deformation of the pressing element is likewise to be taken into consideration.
  • a simple embodiment provides that the respective pressing region is formed by a plurality of segments arranged one behind the other, each having a constant curvature in the direction of rotation and tangentially strung together, whereby their centers of curvature are spaced from one another.
  • the clear width perpendicular to the closing plane of the pressing tool is less than the clear width substantially parallel to the closing plane.
  • FIG. 1 shows an installation element designed as a fitting 2, into which a pipe 3 is inserted at one end, and an embodiment of a pressing tool according to the invention, which is applied to the fitting 2, in an oblique view.
  • the pressing tool shown here has two pressing elements 5, which are identical here and have an elongated sickle-shaped basic shape.
  • a force introduction region 17 and a stop surface 20 are provided at one end.
  • a tension jaw can be applied, which in turn is connected to a drive device. From the Switzerlanddorfbacke two driving forces are exerted on the pressing tool 2 for pressing the fitting 2 on the tube.
  • the two pressing elements 5 are hinged together via a common bearing pin 18.
  • the fitting 2 shown here is a KIWA-DVGW copper fitting of nominal size DN 18 of the system supplier "Viega, Franz Viegner II, D-57428 Attendorn".
  • the fitting 2 has both ends a receiving part 1, which here in each case for a pipe. 3 the same nominal diameter is formed.
  • the tube 3, for example, a copper tube with one and a half millimeters wall thickness, is inserted at one end to a provided in the fitting 2 stop in this.
  • the one visible in Figure 1 receiving part 1 of the fitting 2 is in the non-pressed-initial state and has a rotationally symmetrical basic shape. In the non-pressed-receiving part 1 is still no tube 3 is inserted.
  • the receiving part 1 has a sealing portion 4, which is designed here as a bulge in the form of a Torushget, two Aufpressabête 21, which are arranged on both sides of the sealing portion 4, and two Eingargabitese 22, which are each adjacent to one of the Aufpressab mustarde 21.
  • the sealing portion 4 has on its inside a circumferential, also toroidal bulge, in which a only partially visible sealing ring 19 is provided.
  • the two pressing elements 5 are moved against each other until the two unfolded end pieces of the pressing elements 5 with their stop surfaces 20 abut each other.
  • the two pressing elements 5 By the mutual movement of the two pressing elements 5 forming forces are exerted flat on the réellepressenden receiving part 1, whereby this deformed plastically deforming and insoluble on the tube 3 is pressed.
  • the two pressing elements 5 By acting on the tool when forming the other receiving part, mechanical loads, the two pressing elements 5 are deformed elastically bending, since these - compared to the substantially rigid pressing jaws of a conventional pressing tongs - due to their dimensions a significant elastic flexibility in the loads occurring exhibit.
  • the extent and shape of the elastic deformation of the respective pressing member 5 are determined by its rigidity, the one end introduced driving force, the other end of the common bearing pin 18 force exerted and the opposite of the mecanicpressenden receiving part forming forces.
  • the two press-on sections 21 and the two embossing sections 22 are formed here in a cylindrical or hexagonal shape during pressing on by the pressing tool.
  • the press-on sections 21 are frictionally engaged or the press-fit sections 22 are connected in a form-fitting manner to the pipe 3.
  • About the embossed into the fitting 2 and the pipe 3 hexagon connections are generally smaller nominal sizes DN secured against pulling apart by small and medium pull-out forces. With larger nominal diameters DN, a cutting ring secures the connection against larger pull-out forces, which are usually arranged between a fitting and a tube inserted into it.
  • a receiving part of such a fitting has a securing area arranged around the cutting ring, which is deformed when pressed into an outer shape within a predetermined cylinder shape tolerance and thus exerts a specified compressive force on the cutting ring.
  • the toroidal bulge of the sealing portion 4 is, however, reformed in such a toroidal shape when pressing the fitting 2 on the tube 2 that the sealing ring 19 is elastically deformed in a controlled manner between the tube 3 and the bulge and thus biased to a defined extent.
  • compressive stresses are exerted on the one hand on the tube 3 and on the other hand on the bulge.
  • the compressive stresses exerted by the sealing ring 19 are of decisive importance for the tightness of the connection.
  • the quality and the reliability of the connection between an installation element and a pipe can be assessed via the dimensions of the external shape of the pressed-on receiving part 1. If the key width of the hexagon, which are embossed in the embossing regions 22, within a range of 23.1 to 23.6 millimeters, so a specified Auszugswert for the pressed connection is guaranteed by the manufacturer. Are the dimensions of the Outer shape of the sealing portion 4 of the pressed-receiving part 1 within a predetermined dimensional tolerance, it can be judged on the elastic deformation of the sealing ring 19 and thus on the fitting 2 and the pipe 3 of this exerted compressive stresses, the tightness of the connection.
  • a roundness tolerance with a lower and an upper diameter of 24.7 or 25.2 millimeters is specified by the manufacturer for the apex region of the toroidal bulge of the fitting 2.
  • FIG. 2 shows the upper pressing element 5 of the pressing tool from FIG. 1 in another oblique view.
  • the pressing element 5 has at one end the end piece with the stop face 20 and the force introduction region 17 visible only in FIG. At the other end it has a hinge part 23, in which a receiving bore for the bearing pin 18 shown only in Figure 1 is provided.
  • the pressing element 5 has, on the side facing the other pressing element, a torus-shaped pressing region 7, two cylindrical pressing regions 24 and two hexagonal pressing regions 25, at the two ends of which in each case a small, planar end region 26 adjoins.
  • the end regions 26 are formed by additional recesses in the pressing element 5.
  • the press areas 7 and 24 facing away from the ends of the end portions 26 are each provided with a radius.
  • a first pressing region 7 can be assigned to the sealing section 4 from FIG. 1 and has a two-dimensionally curved shape which has three different curvatures in the direction of rotation here.
  • the two cylindrical pressing portions 24 are arranged, which are each one of the Aufpressabête 21 of Figure 1 can be assigned. They have a one-dimensionally curved shape with here also three different curvatures.
  • the planar end regions 26 arranged between each of the pressing regions 7 and 24 and the abutment surface 20 on the one hand and the joint part 23 on the other hand have different lengths here.
  • FIG. 3 shows a detailed view of the closed pressing tool from FIG. 1 in the stationary state with the exposed pressing areas 7, 24 and 25 and the adjacent end areas 26 in a sectional view.
  • the pressing regions 7, 24 and 25 and the respective end regions 26 of the two pressing elements 5 are each arranged mirror-symmetrically to the closing plane 6. Since the tool is not exposed to mechanical loads in the stationary state, the pressing elements 5 and their exposed pressing areas 7, 24 and 25 are not deformed elastically.
  • the toroidal pressing region 7 is here by a central segment 10, a joint-side segment 11 and a stop-side segment 12 formed, which merge tangentially into each other.
  • the individual segments 10, 11 and 12 each have different curvatures in the direction of rotation.
  • the central segment 10 extends over an angular range of 120 ° and thus has the multiple size of the joint-side segment 11 and the stop-side segment 12, which in this case extend over an angular range of approximately 22 ° each.
  • the central segment 10 here in the circumferential direction has a central radius of curvature 14 of 12.35 millimeters, have the joint-side segment 11 and the stop-side segment 12 has a corresponding joint-side or stop-side radius of curvature-15 and 16 of 12.45 and 12.55 millimeters
  • the center of the central radius of curvature 14 additionally has a center offset 13 of 0.3 millimeters beyond the closing plane 6, as a result of which - in the stationary state of the tool - the banana shape of the torus-shaped pressing region 7 is additionally reinforced.
  • the centers of the joint-side and stop-side radii of curvature 15 and 16 are also beyond the closing plane 6.
  • the third pressing portion 25 is formed in the shape of a half of a hexagon.
  • FIG. 4 shows a scale comparison of the inner profiles of the same pressing element in the resting and in the pressing state of a closed pressing tool.
  • a continuous line 27 represents the inner profile of the pressing element in the stationary state with an exposed pressing area.
  • a broken line 28, however, represents the inner profile of the same pressing element in the pressing state of the closed tool.
  • the maximum difference at the apex of the pressing area in Aufklappcardi is slightly more than half a millimeter. This does not correspond to one percent of the nominal diameter of the press connection.
  • the difference of the clear width in the closing plane of the pressing tool has a value of slightly more than two millimeters, which corresponds to about 4 percent of the nominal diameter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Gripping On Spindles (AREA)

Abstract

The pressing tool has two pressing elements to press the receiving part (1) of an installation element (2) onto tube (3) pushed into the receiving part. It has two pressing elements (5), which can move relative to each other. The receiving part has at least one sector (4, 21) which is deformed during the pressing process.

Description

Die Erfindung betrifft ein Presswerkzeug zum Aufpressen eines Aufnahmeteils eines Installationselements auf ein in den Aufnahmeteil eingeschobenes Rohr, wobei der aufgepresste Aufnahmeteil einen Abschnitt mit einer in Umlaufrichtung konstant gekrümmten Aussenform innerhalb einer vorbestimmten Formtoleranz aufweist, nach dem Oberbegriff des Anspruchs 1 (siehe z.B. DE 93 14 054 U ).The invention relates to a pressing tool for pressing a receiving part of an installation element on an inserted into the receiving part tube, wherein the pressed-receiving part has a portion with a constant circumferential direction in the circumferential direction within a predetermined shape tolerance, according to the preamble of claim 1 (see, eg DE 93 14 054 U ).

Zum kaltumformenden Verbinden eines Installationselements - beispielsweise eines Fittings oder eines Anschlussstücks - mit einem Rohr wird das Presswerkzeug um einen Aufnahmeteil des Installationselements angelegt. Über eine -Antriebseinrichtung werden Antriebskräfte in das Presswerkzeug eingeleitet, wodurch vom Presswerkzeug Presskräfte auf den Aufnahmeteil, in den das Rohr eingeschoben ist, ausgeübt werden. Durch die Presskräfte wird der Aufnahmeteil derart umgeformt, dass der Aufnahmeteil über ein Aufpressen mit dem eingeschobenen Rohr unlösbar fest verbunden wird.For cold forming connecting an installation element - for example a fitting or a fitting - with a pipe, the pressing tool is applied around a receiving part of the installation element. Driving forces are introduced into the pressing tool via a drive device, whereby pressing forces are exerted on the receiving part, into which the tube is inserted, by the pressing tool. Due to the pressing forces of the receiving part is transformed so that the receiving part is permanently connected by an indentation with the inserted tube.

In der Regel weist ein Aufnahmeteil neben wenigstens einem Aufpressabschnitt zum Weiterleiten von Längs- und Torsionskräften auch einen Dichtabschnitt zum Abdichten der Verbindung auf, womit ein solcher Aufnahmeteil dichtend auf ein Rohr aufgepresst werden kann. Bei Verbindungen kleinerer Nennweiten DN (Deutsche Norm) ist zudem ein schmaler Einprägbereich mit einer polygonalen Grundform zur mechanischen Sicherung der Verbindung vorgesehen.In general, a receiving part in addition to at least one Aufpressabschnitt for forwarding longitudinal and torsional forces on a sealing portion for sealing the connection, whereby such a receiving part can be pressed sealingly on a pipe. For connections of smaller nominal diameters DN (German standard), a narrow embossing area with a polygonal basic shape is also provided for the mechanical securing of the connection.

Das Abdichten der Verbindung zwischen Rohr und Installationselement wird in der Regel über einen Dichtring erzielt, der dem Rohr zugewandt an der Innenseite des Dichtabschnitts des Aufnahmeteils angeordnet ist. Für ein sicheres und zuverlässiges Abdichten ist einerseits eine umlaufend gleichmässig verteilte, elastische Druckspannung des Dichtrings gegen das Rohr und gegen den Aufnahmeteil und andererseits ein Vermeiden von Quetschungen des Dichtrings unbedingt erforderlich. Eine solche gleichmässige Druckspannung kann nur erzielt werden, wenn beim Aufpressen des Aufnahmeteils der Dichtabschnitt innerhalb eines ganz bestimmten Umfangs umlaufend gleichförmig umgeformt wird. Deshalb werden von Herstellern derartiger Installationselemente typenspezifisch vorbestimmte Formtoleranzen, beispielsweise Rundheits- oder Zylinderformtoleranzen, für aufpresste Aufnahmeteile vorgegeben. Die Formtoleranzen betreffen insbesondere die jeweilige Aussenform des Abdichtbereichs oder gegebenenfalls auch des ganzen Aufpressbereichs.The sealing of the connection between pipe and installation element is usually via a sealing ring achieved, which is arranged facing the pipe on the inside of the sealing portion of the receiving part. For a reliable and reliable sealing on the one hand a circumferentially evenly distributed, elastic compressive stress of the sealing ring against the pipe and against the receiving part and on the other hand avoiding pinching of the sealing ring is absolutely necessary. Such a uniform compressive stress can only be achieved if, during the pressing-on of the receiving part, the sealing section is deformed circumferentially uniformly within a very specific circumference. Therefore, manufacturers of such installation elements type-specific predetermined shape tolerances, such as roundness or cylinder shape tolerances, given for pressed-receiving parts. The shape tolerances relate in particular to the respective outer shape of the sealing area or possibly also of the entire press-on area.

Zum dichtenden Aufpressen von Rohrverbindungen mit Nennweiten DN bis 54 mm sind aus der Praxis unter anderem scherenartige Presszangen bekannt, die sich einenends maulartig öffnen und anderenends fest mit einer Antriebseinrichtung verbunden sind. Für grössere Nennweiten DN werden in der Regel Pressketten oder auch Pressringe eingesetzt, die bei jedem Anlegen an ein aufzupressendes Installationselement von der zugeordneten Antriebseinrichtung abgekuppelt werden müssen.For sealing press-fitting of pipe connections with nominal widths DN to 54 mm, scissors-like pressing tongs are known in practice, among other things, which open at one end like a mouth and at the other end are firmly connected to a drive device. For larger diameters DN usually compression chains or compression rings are used, which must be disconnected at each application to a aufzupressendes installation element of the associated drive device.

Aus der DE 93 14 054 U1 ist eine Presszange zum Verpressen von Rohrverbindungen bekannt. Die Presszange weist zwei Presshebel auf, an denen einenends jeweils eine im Wesentlichen starre Pressbacke vorgesehen ist und die jeweils über eine Achse gegenläufig schwenkbar an Verbindungsplatten gelagert sind. Im geschlossenen Zustand des Werkzeugs wird von beiden Pressbacken eine im Wesentlichen zylindrische Pressform gebildet, die beim Verpressen in den Pressling eingearbeitet wird. Aufgrund der gegebenen Abmessungen solcher Presszangen hat sich in der Praxis gezeigt, dass die Handhabung bei engen Raumverhältnissen, insbesondere bei der Herstellung von Rohrleitungen für Hausinstallationen, umständlich und bei vormontierten Flttingen in Wand- oder Bodennähe oft gar nicht möglich ist. Zudem besteht besonders in Bodennähe die Gefahr, dass kleine Gegenstände oder Baustellenschutz ein vollständiges Schliessen der Presszangen verunmöglicht, was eine mangelhafte Funktion der Rohrverbindung zur Folge haben kann. Da zudem die sich maulartig öffnenden Endstücke der Presszange vom Bediener nur- schwer einsehbar sind, sind-Presszangen bekannt, bei denen eine spezielle Einrichtung zum Überwachen eines vollständigen Schliessens der beiden Pressbacken vorgesehen ist.From the DE 93 14 054 U1 is a pressing tongs for pressing pipe joints known. The crimping tool has two pressing levers, on each of which a substantially rigid pressing jaw is provided at one end, and each of which is pivotable in opposite directions about an axis Connection plates are stored. In the closed state of the tool, a substantially cylindrical mold is formed by the two press jaws, which is incorporated into the compact during pressing. Due to the given dimensions of such pressing tongs has been shown in practice that the handling in confined spaces, especially in the production of pipelines for domestic installations, cumbersome and pre-mounted Flttingen near the wall or floor is often not possible. In addition, there is the danger, especially near the ground, that small objects or site protection makes it impossible to completely close the pressing tongs, which can result in a defective function of the pipe connection. In addition, since the mouth-opening end pieces of the pressing tongs are difficult for the operator to see, pressing tongs are known in which a special device for monitoring a complete closure of the two pressing jaws is provided.

Es ist Aufgabe der Erfindung Mängel des Standes der Technik zu beheben und ein Presswerkzeug bereitzustellen, das auch in geringen Abständen zu Wand- und Bodenflächen sicher und zuverlässig ein dichtendes Aufpressen eines Installationselements auf ein Rohr ermöglicht.It is an object of the invention to remedy the deficiencies of the prior art and to provide a pressing tool that allows safe and reliable, even at close distances to wall and bottom surfaces a sealing pressing an installation element on a pipe.

Diese Aufgabe wird durch ein Presswerkzeug gelöst, bei dem die Merkmale des Anspruchs 1 verwirklicht sind.This object is achieved by a pressing tool, in which the features of claim 1 are realized.

Weitere alternative oder vorteilhafte Aus- bzw. Weiterbildungen der Erfindung sind in den Merkmalen der abhängigen Ansprüche beschrieben.Further alternative or advantageous embodiments or further developments of the invention are described in the features of the dependent claims.

Ein Presswerkzeug zum Aufpressen eines Aufnahmeteils eines Installationselements auf ein in den Aufnahmeteil eingeschobenes Rohr weist zwei Presselemente auf, die gegeneinander bewegbar verbunden sind. Der Aufnahmeteil weist wenigstens einen Abschnitt auf, der durch den Aufpressvorgang derart umgeformt wird, so dass der aufgepresste Abschnitt eine in Umlaufrichtung im Wesentlichen konstant gekrümmte Aussenform aufweist, die innerhalb einer vorgegebenen Formtoleranz, beispielsweise einer Rundheitstoleranz oder einer Zylinderformtoleranz, liegt. Jedes der beiden Presselemente weist an der dem jeweils anderen Presselement zugewandten Seite einen Pressbereich auf, der dem Abschnitt zugeordnet ist.A pressing tool for pressing a receiving part of an installation element on a tube inserted into the receiving part has two pressing elements which are movably connected to one another. The receiving part has at least one section which is shaped in such a way by the pressing-on process, so that the pressed-on section has an outer shape substantially constantly curved in the circumferential direction, which lies within a predetermined shape tolerance, for example a roundness tolerance or a cylinder shape tolerance. Each of the two pressing elements has, on the side facing the respective other pressing element, a pressing region which is assigned to the section.

Im geöffneten Zustand des Presswerkzeugs sind wenigstens zwei einander zugeordnete Endstücke der Presselemente soweit voneinander entfernt, dass das Presswerkzeug über den Aufnahmeteil geschoben und am Aufnahmeteil angelegt werden kann. Zum Aufpressen des Aufnahmeteils werden Antriebskräfte in das Werkzeug eingeleitet, durch welche die Endstücke gegeneinander bewegt werden. Durch das Gegeneinanderbewegen der am Aufnahmeteil anliegenden Presselemente wird der Aufnahmeteil kaltumformend auf das Rohr aufgepresst. Der Aufpressvorgang ist beendet, wenn die einander zugeordneten Endstücke aufeinander stossen - das Presswerkzeug so genannt auf Block fährt - und sich damit im geschlossenen Zustand befindet.In the open state of the pressing tool at least two mutually associated end pieces of the pressing elements are far enough away from each other that the pressing tool can be pushed over the receiving part and applied to the receiving part. For pressing the receiving part driving forces are introduced into the tool, by which the end pieces are moved against each other. As a result of the mutual movement of the pressing elements bearing against the receiving part, the receiving part is cold-pressed onto the tube. The pressing operation is completed when the mutually associated end pieces abut each other - the press tool so-called runs on block - and thus is in the closed state.

Gemäss der Erfindung ist wenigstens eines der beiden Presselemente derart elastisch deformierbar, insbesondere elastisch biegbar, ausgebildet, dass unter den auf das Presselement wirkenden, sich während des Aufpressvorgangs ändernden Kräften, sich die Form dessen Pressbereichs ändert. Dabei liegt der im ruhenden Zustand des Presswerkzeugs freiliegende Pressbereich in Umlaufrichtung in einer von der Aussenform abweichend gekrümmten Form vor. Hingegen liegt derselbe Pressbereich in Umlaufrichtung in einer der Aussenform entsprechenden, im Wesentlichen konstant gekrümmten Form vor, wenn der Pressbereich im aufpressenden Zustand des geschlossenen Presswerkzeugs am Abschnitt anliegt.According to the invention, at least one of the two pressing elements is elastically deformable, in particular elastically bendable, in such a way that, under the forces acting on the pressing element and changing during the pressing process, the shape of its pressing region changes. In this case, the pressing area exposed in the stationary state of the pressing tool is in the circumferential direction in a shape deviating from the outer shape. By contrast, the same pressing region is in the circumferential direction in a substantially constant curved shape corresponding to the outer shape, when the pressing region abuts against the section in the pressing-on state of the closed pressing tool.

Bekanntermassen sind Installationselemente und Rohre aus Materialen gefertigt, die nach einer plastischen Deformation mehr oder weniger elastisch rückfedern. Im aufpressenden Zustand des geschlossenen Presswerkzeugs weist daher der am Abschnitt anliegende Pressbereich nicht die identische, sondern eine entsprechend etwas stärkere, im Wesentlichen konstante Krümmung auf. Dadurch wird verhindert, dass die Aussenform des Abschnitts nach Beenden des Aufpressvorgangs ausserhalb der Formtoleranz zu liegen kommt.As is well known, installation elements and pipes are made of materials which spring back more or less elastically after plastic deformation. In the pressing-on state of the closed pressing tool, therefore, the pressing region abutting the section does not have the identical, but a correspondingly somewhat stronger, substantially constant curvature. This prevents that the outer shape of the section comes to rest after completion of the pressing process outside the form tolerance.

Ein Presselement gemäss der Erfindung ist nicht mehr praktisch starr ausgebildet, sondern deformiert sich elastisch unter Belastungen, die beim Aufpressen auf das Presselement wirken. Dabei werden die elastischen Deformationen, die durch die Antriebskräfte, von der Verbindung der beiden Presselemente und vom aufzupressenden Aufnahmeteil auf das Presselement ausgeübten Kräfte verursacht werden, gezielt bei der Gestaltung des Presselements, insbesondere bei der Formgebung des Pressbereichs, berücksichtigt. Aus diesem Grund weicht auch die Krümmung des im ruhenden Zustand freiliegenden Pressbereichs von der konstanten Krümmung der geforderten Aussenform des aufgepressten Abschnitts ab. Da bei einem erfindungsgemässen Presselement anstatt einer hohen Steifigkeit elastische Deformationen beabsichtigt sind, lassen sich kleinere, schlankere und leichtere, Presswerkzeuge bereitstellen, mit denen Aufnahmeteile auf Rohre aufgepresst werden können, deren Abschnitte reproduzierbar innerhalb der geforderten Formtoleranz liegen.A pressing element according to the invention is no longer practically rigid, but deforms elastically under loads that act on the pressing element during pressing. In this case, the elastic deformations, which are caused by the driving forces exerted by the connection of the two pressing elements and the aufzupressenden receiving part on the pressing element forces, targeted in the design of the pressing element, in particular in the shaping of the pressing area, taken into account. For this reason, the curvature of the pressing area exposed in the stationary state also deviates from the constant curvature of the required outer shape of the pressed-on section. Since in a novel pressing element instead of a high Rigidity elastic deformations are intended to be smaller, slimmer and lighter, press tools can be provided with which receiving parts can be pressed onto pipes whose sections are reproducible within the required shape tolerance.

Eine während des Aufpressvorgangs variable Form des Pressbereichs bietet zusätzliche Möglichkeiten den Aufpressvorgang selbst gezielt zu beeinflussen. Wird beim Aufpressen des Aufnahmeteils die Summe der für das Aufpressen erforderlichen Umformarbeit und der für die elastische Deformation des Presselements erforderlichen Arbeit möglichst gleichmässig über den von den Antriebskräften beim Aufpressen zurückgelegten Weg verteilt, so können auftretende Spitzenwerte der Antriebskräfte gezielt reduziert werden. Einerseits kann dadurch die Dauerfestigkeit und die Langzeit-Formstabilität von Presswerkzeugen positiv beeinflusst werden. Damit sind auch Vorteile bei der Dimensionierung derartiger Presswerkzeuge verbunden. Andererseits ist ein derartiges Presswerkzeug auch mit einer weniger starken Antriebseinrichtung betreibbar.A variable during the pressing process form of the pressing area offers additional possibilities to influence the pressing itself targeted. If the sum of the forming work required for the pressing and the work required for the elastic deformation of the pressing element is distributed as evenly as possible over the path covered by the driving forces during the pressing on when pressing on the receiving part, peak values of the driving forces occurring can be purposefully reduced. On the one hand, the fatigue strength and the long-term dimensional stability of pressing tools can be positively influenced. This also benefits in the dimensioning of such pressing tools are connected. On the other hand, such a pressing tool can also be operated with a less powerful drive device.

Bei elastisch deformierbaren Presswerkzeugen ist eine unmittelbare Abhängigkeit zwischen der Dimensionierung des Presselements und der Formgebung des Pressbereichs gegeben. Die Formgebung für ein solches elastisch deformierbares Presselement kann einerseits durch aufwändige Berechnungen oder andererseits durch iteratives Probieren und Korrigieren des jeweiligen Presselements, insbesondere dessen Pressbereichs, erhalten werden. So hat sich ein Start des Aufpressprozesses in Bereichen parallel zur Schliessebene des Presswerkzeugs durch den Zentralteil des Pressbereichs und ein anschliessendes Zusammenbiegen des Presselements, das ein Umformen durch die beiden Randteile des Pressbereichs auslöst, als eine zielführende Abfolge einzelner Umformschritte erwiesen. Durch ein schrittweises Korrigieren der Form des Pressbereichs um einen Teils der festgestellten Abweichungen von der geforderten Aussenform des Pressbereichs nach dem Aufpressen des Abschnitts, kann die definitive Formgebung des Pressbereichs ermittelt werden.In the case of elastically deformable pressing tools, there is an immediate dependence between the dimensioning of the pressing element and the shaping of the pressing region. The shaping of such an elastically deformable pressing element can be obtained on the one hand by complex calculations or on the other hand by iterative testing and correction of the respective pressing element, in particular its pressing region. So has a start of the pressing process in areas parallel to the closing level of the pressing tool by the central part of the pressing region and a subsequent bending together of the pressing element, which triggers a forming by the two edge parts of the pressing region, proved to be a targeted sequence of individual forming steps. By stepwise correcting the shape of the pressing area around a part of the detected deviations from the required outer shape of the pressing area after the pressing of the section, the definitive shaping of the pressing area can be determined.

Mit Vorteil werden beide Presselemente eines Presswerkzeugs in gleicher Weise, erfindungsgemäss elastisch deformierbar ausgebildet, so dass deren Pressbereiche im geschlossenen Zustand des Werkzeugs erst unter den beim Aufpressen auftretenden mechanischen Belastungen eine der geforderten Aussenform entsprechende Form annehmen.Advantageously, both pressing elements of a pressing tool in the same way, according to the invention elastically deformable, so that their pressing areas in the closed state of the tool assume a form corresponding to the required outer shape only under the mechanical loads occurring during pressing.

Bei einer bevorzugten Ausführungsform der Erfindung sind beide Presselemente sichelförmig ausgebildet und einenends über einen einzigen Lagerbolzen miteinander aufklappbar verbunden. Anderenends weisen beide Presselemente ein Endstück mit jeweils einem Krafteinleitbereich und einer Anschlagfläche für das auf Block fahren des Werkzeugs auf. Diese Ausführungsform zeichnet sich durch eine einfache Bauweise sowie durch eine präzise geführte Bewegung der beiden elastisch biegbaren Presselemente aus.In a preferred embodiment of the invention, both pressing elements are sickle-shaped and connected at one end via a single bearing pin hinged together. At the other end, both pressing elements have an end piece, each with a force introduction region and a stop surface for the block drive of the tool. This embodiment is characterized by a simple design and by a precisely guided movement of the two elastically bendable pressing elements.

Ein Aufnahmeteil eines Installationselements weist neben einem konstant gekrümmten Abschnitt für ein Dichtelement in der Regel einen weiteren Abschnitt zum unlösbaren Verbinden des Installationselements mit einem Rohr auf. Beispielsweise bei Aufnahmeteilen kleinerer Nennweiten ist oft ein weiterer Einprägbereich vorgesehen, der in einen Sechskant umgeformt wird. Für mittlere und grössere Nennweiten weist ein solcher weiterer Abschnitt zum unlösbaren Verbinden oft im aufgepressten Zustand ebenfalls eine konstante Krümmung, gegebenenfalls mit einer zylinderförmigen Form, auf. Ein entsprechendes Presselement weist einen dem weiteren Abschnitt zugeordneten weiteren Pressbereich auf, bei deren Formgebung die elastische Deformation des Presselements ebenfalls zu berücksichtigen ist.A receiving part of an installation element, in addition to a constant curved portion for a sealing element usually has a further section for non-detachable connection of the installation element with a pipe. For example, with receiving parts of smaller sizes is often another Stamping provided, which is formed into a hexagon. For medium and large nominal diameters, such a further section for permanent connection also often has a constant curvature, optionally with a cylindrical shape, in the pressed-on state. A corresponding pressing element has a further pressing region assigned to the further section, in the shaping of which the elastic deformation of the pressing element is likewise to be taken into consideration.

Bei einem aufklappbaren Presswerkzeug mit sichelförmigen Presselementen sieht eine einfache Ausführungsform vor, dass der jeweilige Pressbereich durch mehrere hintereinander angeordnete Segmente gebildet wird, die in Umlaufrichtung jeweils eine konstante Krümmung aufweisen und tangetial aneinandergereiht sind, wodurch deren Krümmungszentren zueinander beabstandet sind. Bei einem derartigen Presswerkzeug wird im ruhenden, geschlossenen Zustand von den freiliegenden Pressbereiche eine von der Aussenform abweichende Ruheform gebildet, deren lichte Weite senkrecht zur Schliessebene des Presswerkzeugs geringer ist als deren lichte Weite im Wesentlichen parallel zur Schliessebene.In a hinged pressing tool with crescent-shaped pressing elements, a simple embodiment provides that the respective pressing region is formed by a plurality of segments arranged one behind the other, each having a constant curvature in the direction of rotation and tangentially strung together, whereby their centers of curvature are spaced from one another. In such a pressing tool is formed in the stationary, closed state of the exposed pressing areas deviates from the outer shape resting form, the clear width perpendicular to the closing plane of the pressing tool is less than the clear width substantially parallel to the closing plane.

Nachstehend werden Ausführungsbeispiele der Erfindung anhand von Figuren näher erläutert. Es zeigen:

Figur 1
ein erfindungsgemässes Presswerkzeug, das im aufpressenden Zustand einen Fitting auf ein Rohr aufpresst, in Schrägansicht,
Figur 2
eines der beiden Presselemente des Presswerkzeugs aus Figur 1 in einer anderen Schrägansicht,
Figur 3
eine Detailansicht des geschlossenen Presswerkzeugs aus Figur 1 im ruhenden Zustand mit den beiden Pressbereichen im Schnitt und
Figur 4
eine Differenzdarstellung der Innenprofile desselben Presselements im ruhenden und im aufpressenden Zustand eines geschlossenen Presswerkzeugs.
Embodiments of the invention will be explained in more detail with reference to figures. Show it:
FIG. 1
a pressing tool according to the invention, which presses a fitting onto a pipe in the pressing-on state, in an oblique view,
FIG. 2
one of the two pressing elements of the pressing tool of Figure 1 in another oblique view,
FIG. 3
a detailed view of the closed pressing tool of Figure 1 in the stationary state with the two pressing areas in section and
FIG. 4
a differential representation of the inner profiles of the same pressing element in the stationary and in the pressing state of a closed pressing tool.

Figur 1 zeigt ein als Fitting 2 ausgebildetes Installationselement, in das einenends ein Rohr 3 eingeschoben ist, sowie ein Ausführungsbeispiel eines erfindungsgemässen Presswerkzeugs, welches an den Fitting 2 angelegt ist, in einer Schrägansicht.FIG. 1 shows an installation element designed as a fitting 2, into which a pipe 3 is inserted at one end, and an embodiment of a pressing tool according to the invention, which is applied to the fitting 2, in an oblique view.

Das hier dargestellte Presswerkzeug weist zwei Presselemente 5 auf, die hier gleich ausgebildet sind und eine länglich sichelförmige Grundform aufweisen. An jedem der beiden Presselemente 5 ist einenends ein Krafteinleitbereich 17 und eine Anschlagfläche 20 vorgesehen. An die beiden Krafteinleitbereiche 17 kann eine Zugbacke angelegt werden, die ihrerseits mit einer Antriebseinrichtung verbunden ist. Von der Zugbacke werden zum Aufpressen des Fittings 2 auf das Rohr 3 zwei Antriebskräfte auf das Presswerkzeug ausgeübt. Anderenends sind die beiden Presselemente 5 über einen gemeinsamen Lagerbolzen 18 aufklappbar miteinander verbunden.The pressing tool shown here has two pressing elements 5, which are identical here and have an elongated sickle-shaped basic shape. At each of the two pressing elements 5, a force introduction region 17 and a stop surface 20 are provided at one end. At the two force introduction regions 17, a tension jaw can be applied, which in turn is connected to a drive device. From the Zugbacke two driving forces are exerted on the pressing tool 2 for pressing the fitting 2 on the tube. At the other end, the two pressing elements 5 are hinged together via a common bearing pin 18.

Bei dem hier dargestellten Fitting 2 handelt es sich um einen KIWA-DVGW-Kupferfitting der Nennweite DN 18 des Systemanbieters "Viega, Franz Viegner II, D-57428 Attendorn". Der Fitting 2 weist beidenends einen Aufnahmeteil 1 auf, der hier jeweils für ein Rohr 3 derselben Nennweite ausgebildet ist. Das Rohr 3, beispielsweise ein Kupferrohr mit eineinhalb Millimeter Wandstärke, ist einenends bis zu einem im Fitting 2 vorgesehenen Anschlag in diesen eingeschoben.The fitting 2 shown here is a KIWA-DVGW copper fitting of nominal size DN 18 of the system supplier "Viega, Franz Viegner II, D-57428 Attendorn". The fitting 2 has both ends a receiving part 1, which here in each case for a pipe. 3 the same nominal diameter is formed. The tube 3, for example, a copper tube with one and a half millimeters wall thickness, is inserted at one end to a provided in the fitting 2 stop in this.

Der eine in Figur 1 sichtbare Aufnahmeteil 1 des Fittings 2 befindet sich im nicht-aufgepressten Ausgangszustand und weist dabei eine rotationssymmetrische Grundform auf. In den nicht-aufgepressten Aufnahmeteil 1 ist noch kein Rohr 3 eingeschoben. Der Aufnahmeteil 1 weist einen Dichtabschnitt 4, der hier als Ausbuchtung in Form einer Torushälfte ausgebildet ist, zwei Aufpressabschnitte 21, die beidseits des Dichtabschnitts 4 angeordnet sind, sowie zwei Einprägabschnitte 22 auf, die jeweils benachbart zu einem der Aufpressabschnitte 21 angeordnet sind. Der Dichtabschnitt 4 weist an dessen Innenseite eine umlaufende, ebenfalls torusförmige Ausbuchtung auf, in dem ein hier nur zum Teil sichtbarer Dichtring 19 vorgesehen ist.The one visible in Figure 1 receiving part 1 of the fitting 2 is in the non-pressed-initial state and has a rotationally symmetrical basic shape. In the non-pressed-receiving part 1 is still no tube 3 is inserted. The receiving part 1 has a sealing portion 4, which is designed here as a bulge in the form of a Torushälfte, two Aufpressabschnitte 21, which are arranged on both sides of the sealing portion 4, and two Einprägabschnitte 22, which are each adjacent to one of the Aufpressabschnitte 21. The sealing portion 4 has on its inside a circumferential, also toroidal bulge, in which a only partially visible sealing ring 19 is provided.

Der andere - in Figur 1 durch das angelegte Werkzeug grossteils verdeckte - Aufnahmeteil befindet sich im aufzupressenden Ausgangszustand. Das Presswerkzeug umgreift den anderen Aufnahmeteil fast vollständig und liegt an diesem an. Durch die Antriebskräfte ist das Presswerkzeug in den aufpressenden Zustand versetzbar. Die beiden Antriebskräfte werden dabei durch eine in Figur 1 nicht dargestellte, an das Werkzeug angelegte Zugbacke auf die Krafteinleitbereiche 17 ausgeübt.The other - largely hidden in Figure 1 by the applied tool - receiving part is in aufzupressenden initial state. The pressing tool almost completely engages around the other receiving part and abuts against it. Due to the driving forces, the pressing tool can be displaced into the pressing-on state. The two driving forces are exerted on the force introduction regions 17 by a drawing jaw, not shown in FIG. 1, applied to the tool.

Durch die beiden Antriebskräfte, die in diesem Ausführungsbeispiel beispielsweise einen Betrag von 60'000 bis 65'000 Newton aufweisen können, werden die beiden Presselemente 5 solange gegeneinander bewegt, bis die beiden aufgeklappten Endstücke der Presselemente 5 mit Ihren Anschlagflächen 20 aufeinander stossen.By the two driving forces, which may for example have an amount of 60,000 to 65,000 Newton in this embodiment, the two pressing elements 5 are moved against each other until the two unfolded end pieces of the pressing elements 5 with their stop surfaces 20 abut each other.

Durch das Gegeneinanderbewegen der zwei Presselemente 5 werden Umformkräfte flächig auf den aufzupressenden Aufnahmeteil 1 ausgeübt, wodurch dieser plastisch deformierend umgeformt und unlösbar auf das Rohr 3 aufpresst wird. Durch die beim Umformen des anderen Aufnahmeteils auf das Werkzeug wirkenden, mechanischen Belastungen werden die beiden Presselemente 5 elastisch biegend deformiert, da diese - im Vergleich zu den im Wesentlichen starren Pressbacken einer herkömmlichen Presszange - aufgrund ihrer Dimensionierung eine wesentliche, elastische Biegbarkeit bei den auftretenden Belastungen aufweisen. Das Ausmass und die Form der elastischen Deformation des jeweiligen Presselements 5 werden durch dessen Steifigkeit, die einenends eingeleitete Antriebskraft, die anderenends vom gemeinsamen Lagerbolzen 18 ausgeübte Kraft und die vom aufzupressenden Aufnahmeteil dem Umformen entgegen gesetzten Kräfte bestimmt.By the mutual movement of the two pressing elements 5 forming forces are exerted flat on the aufzupressenden receiving part 1, whereby this deformed plastically deforming and insoluble on the tube 3 is pressed. By acting on the tool when forming the other receiving part, mechanical loads, the two pressing elements 5 are deformed elastically bending, since these - compared to the substantially rigid pressing jaws of a conventional pressing tongs - due to their dimensions a significant elastic flexibility in the loads occurring exhibit. The extent and shape of the elastic deformation of the respective pressing member 5 are determined by its rigidity, the one end introduced driving force, the other end of the common bearing pin 18 force exerted and the opposite of the aufzupressenden receiving part forming forces.

Die beiden Aufpressabschnitte 21 und die beiden Einprägabschnitte 22 werden hier beim Aufpressen durch das Presswerkzeug zylinderförmig bzw. sechskantförmig umgeformt. Dabei werden die Aufpressabschnitte 21 reibschlüssig bzw. die Einprägabschnitte 22 formschlüssig mit dem Rohr 3 verbunden. Über den in den Fitting 2 und das Rohr 3 eingeprägten Sechskant werden im Allgemeinen Verbindungen kleiner Nennweiten DN gegen ein Auseinanderziehen durch kleine und mittlere Auszugskräfte gesichert. Bei grösseren Nennweiten DN sichert ein Schneidring die Verbindung gegen grössere Auszugskräfte, welcher in der Regel zwischen einem Fitting und einem in diesen eingefügten Rohr angeordnet ist.The two press-on sections 21 and the two embossing sections 22 are formed here in a cylindrical or hexagonal shape during pressing on by the pressing tool. The press-on sections 21 are frictionally engaged or the press-fit sections 22 are connected in a form-fitting manner to the pipe 3. About the embossed into the fitting 2 and the pipe 3 hexagon connections are generally smaller nominal sizes DN secured against pulling apart by small and medium pull-out forces. With larger nominal diameters DN, a cutting ring secures the connection against larger pull-out forces, which are usually arranged between a fitting and a tube inserted into it.

Ein Aufnahmeteil eines solchen Fittings weist einen um den Schneidring angeordneten Sicherungsbereich auf, der beim Aufpressen in eine Aussenform innerhalb einer vorgegebenen Zylinderformtoleranz umgeformt wird und so eine spezifizierte Druckkraft auf den Schneidring ausübt.A receiving part of such a fitting has a securing area arranged around the cutting ring, which is deformed when pressed into an outer shape within a predetermined cylinder shape tolerance and thus exerts a specified compressive force on the cutting ring.

Die torusförmige Ausbuchtung des Dichtabschnitts 4 wird beim Aufpressen des Fittings 2 auf das Rohr 2 hingegen derart torusförmig umgeformt, dass der Dichtring 19 in kontrollierter Weise zwischen dem Rohr 3 und der Ausbuchtung elastisch deformiert und damit in einem definierten Ausmass vorgespannt wird. Vom elastisch vorgespannten Dichtring 19 werden Druckspannungen einerseits auf das Rohr 3 und andererseits auf die Ausbuchtung ausgeübt. Die vom Dichtring 19 ausgeübten Druckspannungen sind für- die Dichtheit der Verbindung von ganz entscheidender Bedeutung.The toroidal bulge of the sealing portion 4 is, however, reformed in such a toroidal shape when pressing the fitting 2 on the tube 2 that the sealing ring 19 is elastically deformed in a controlled manner between the tube 3 and the bulge and thus biased to a defined extent. From the elastically preloaded sealing ring 19 compressive stresses are exerted on the one hand on the tube 3 and on the other hand on the bulge. The compressive stresses exerted by the sealing ring 19 are of decisive importance for the tightness of the connection.

Wenn durch die Antriebskräfte angetrieben die beiden Anschlagflächen 20 der Presselemente 5 aufeinander gestossen werden - das Presswerkzeug so genannt auf Block fährt - ist der Aufpressvorgang beendet und der Fittings 2 über den aufgepressten Aufnahmeteil 1 mit dem Rohr 3 unlösbar dichtend verbunden.When driven by the driving forces, the two abutment surfaces 20 of the pressing elements 5 are pushed together - the press tool so-called runs on block - the pressing operation is completed and the fittings 2 on the pressed-receiving part 1 with the tube 3 inextricably sealingly connected.

In an sich bekannter Weise können über die Abmessungen der Aussenform des aufgepressten Aufnahmeteils 1 die Qualität und die Zuverlässigkeit der Verbindung zwischen einem Installationselement und einem Rohr beurteilt werden. Liegt die Schlüsselweite der Sechskante, die in die Einprägbereiche 22 eingeprägt werden, innerhalb eines Wertebereichs von 23.1 bis 23.6 Millimeter, so wird ein spezifizierter Auszugswert für die aufgepresste Verbindung herstellerseitig garantiert. Liegen die Abmessungen der Aussenform des Dichtabschnitts 4 des aufgepressten Aufnahmeteils 1 innerhalb einer vorgegebenen Formtoleranz, so kann über die elastischen Deformationen des Dichtrings 19 und damit über die auf den Fitting 2 und das Rohr 3 von diesem ausgeübten Druckspannungen die Dichtheit der Verbindung beurteilt werden. Liegt die Aussenform ausserhalb einer spezifizierten Formtoleranz, so wird eine ordnungsgemässe Funktion des Installationselements herstellerseitig nicht mehr garantiert. In diesem Ausführungsbeispiels ist beispielsweise herstellerseitig für den Scheitelbereich der torusförmigen Ausbuchtung des Fittings 2 eine Rundheitstoleranz mit einem unteren und einem oberen Durchmesser von 24.7 bzw. 25.2 Millimetern vorgegeben.In a manner known per se, the quality and the reliability of the connection between an installation element and a pipe can be assessed via the dimensions of the external shape of the pressed-on receiving part 1. If the key width of the hexagon, which are embossed in the embossing regions 22, within a range of 23.1 to 23.6 millimeters, so a specified Auszugswert for the pressed connection is guaranteed by the manufacturer. Are the dimensions of the Outer shape of the sealing portion 4 of the pressed-receiving part 1 within a predetermined dimensional tolerance, it can be judged on the elastic deformation of the sealing ring 19 and thus on the fitting 2 and the pipe 3 of this exerted compressive stresses, the tightness of the connection. If the external shape is outside of a specified dimensional tolerance, a proper function of the installation element manufacturer is no longer guaranteed. In this exemplary embodiment, for example, a roundness tolerance with a lower and an upper diameter of 24.7 or 25.2 millimeters is specified by the manufacturer for the apex region of the toroidal bulge of the fitting 2.

Figur 2 zeigt das obere Presselement 5 des Presswerkzeugs aus Figur 1 in einer anderen Schrägansicht. Das Presselement 5 weist einenends das Endstück mit der Anschlagfläche 20 und den nur in Figur 1 sichtbaren Krafteinleitbereich 17 auf. Anderenends weist es einen Gelenkteil 23 auf, in dem eine Aufnahmebohrung für den nur in Figur 1 dargestellten Lagerbolzen 18 vorgesehen ist. Zwischen der Anschlagfläche 20 und dem Gelenkteil 23 weist hier das Presselement 5 an der dem anderen Presselement zugewandten Seite einen torusförmigen Pressbereich 7, zwei zylinderförmige Pressbereiche 24 und zwei sechseckförmige Pressbereiche 25 auf, an deren beiden Enden jeweils ein hier kleiner, planer Endbereich 26 anschliesst. Die Endbereiche 26 werden durch zusätzliche Ausnehmungen im Presselement 5 gebildet. Die den Pressbereichen 7 und 24 abgewandten Enden der Endbereiche 26 sind jeweils mit einem Radius versehen.FIG. 2 shows the upper pressing element 5 of the pressing tool from FIG. 1 in another oblique view. The pressing element 5 has at one end the end piece with the stop face 20 and the force introduction region 17 visible only in FIG. At the other end it has a hinge part 23, in which a receiving bore for the bearing pin 18 shown only in Figure 1 is provided. Here, the pressing element 5 has, on the side facing the other pressing element, a torus-shaped pressing region 7, two cylindrical pressing regions 24 and two hexagonal pressing regions 25, at the two ends of which in each case a small, planar end region 26 adjoins. The end regions 26 are formed by additional recesses in the pressing element 5. The press areas 7 and 24 facing away from the ends of the end portions 26 are each provided with a radius.

Das Presselement 5 ist hier im ruhenden Zustand mit freiliegenden Pressbereichen dargestellt. Ein erster Pressbereich 7 ist dem Dichtabschnitt 4 aus Figur 1 zuordenbar und weist eine zweidimensional gekrümmte Form auf, die in Umlaufrichtung hier drei unterschiedliche Krümmungen aufweist. Beidseits des ersten Pressbereichs 7 sind die beiden zylinderförmigen Pressbereiche 24 angeordnet, die jeweils einem der Aufpressabschnitte 21 aus Figur 1 zuordenbar sind. Sie weisen eine eindimensional gekrümmte Form mit hier ebenfalls drei unterschiedlichen Krümmungen auf. Angrenzend an die beiden zylinderförmigen Pressbereiche 24 sind die sechseckförmigen Pressbereiche 25 angeordnet, welche die an sich bekannte Form eines halben Sechskants aufweisen und dem Einprägbereich 22 aus Figur 1 zuordenbar sind. Die zwischen jedem der Pressbereiche 7 und 24 und der Anschlagfläche 20 einerseits und dem Gelenkteil 23 andererseits angeordneten planen Endbereiche 26 weisen hier unterschiedliche Längen auf.The pressing element 5 is shown here in the stationary state with exposed pressing areas. A first pressing region 7 can be assigned to the sealing section 4 from FIG. 1 and has a two-dimensionally curved shape which has three different curvatures in the direction of rotation here. On both sides of the first pressing portion 7, the two cylindrical pressing portions 24 are arranged, which are each one of the Aufpressabschnitte 21 of Figure 1 can be assigned. They have a one-dimensionally curved shape with here also three different curvatures. Adjacent to the two cylindrical pressing portions 24, the hexagonal-shaped pressing portions 25 are arranged, which have the known shape of a half hexagon and the embossing region 22 of Figure 1 can be assigned. The planar end regions 26 arranged between each of the pressing regions 7 and 24 and the abutment surface 20 on the one hand and the joint part 23 on the other hand have different lengths here.

Figur 3 zeigt eine Detailansicht des geschlossenen Presswerkzeugs aus Figur 1 im ruhenden Zustand mit den freiliegenden Pressbereichen 7, 24 und 25 sowie den angrenzenden Endbereichen 26 in Schnittansicht. Die Pressbereiche 7, 24 und 25 sowie die jeweiligen Endbereiche 26 der beiden Presselemente 5 sind jeweils spiegelsymmetrisch zur Schliessebene 6 angeordnet. Da im ruhenden Zustand das Werkzeug keinen mechanischen Belastungen ausgesetzt ist, sind auch die Presselemente 5 und deren freiliegende Pressbereiche 7, 24 und 25 nicht elastisch deformiert.FIG. 3 shows a detailed view of the closed pressing tool from FIG. 1 in the stationary state with the exposed pressing areas 7, 24 and 25 and the adjacent end areas 26 in a sectional view. The pressing regions 7, 24 and 25 and the respective end regions 26 of the two pressing elements 5 are each arranged mirror-symmetrically to the closing plane 6. Since the tool is not exposed to mechanical loads in the stationary state, the pressing elements 5 and their exposed pressing areas 7, 24 and 25 are not deformed elastically.

Der torusförmige Pressbereich 7 wird hier durch ein zentrales Segment 10, ein gelenkseitiges Segment 11 und ein anschlagseitiges Segment 12 gebildet, die jeweils tangential ineinander übergehen. Die einzelnen Segmente 10, 11 und 12 weisen jeweils unterschiedliche Krümmungen in Umlaufrichtung auf. Das zentrale Segment 10 erstreckt sich über einen Winkelbereich von 120° und hat damit die mehrfache Grösse des gelenkseitigen Segments 11 und des anschlagseitigen Segments 12, die sich hier über einen Winkelbereich von ca. jeweils 22° erstrecken.The toroidal pressing region 7 is here by a central segment 10, a joint-side segment 11 and a stop-side segment 12 formed, which merge tangentially into each other. The individual segments 10, 11 and 12 each have different curvatures in the direction of rotation. The central segment 10 extends over an angular range of 120 ° and thus has the multiple size of the joint-side segment 11 and the stop-side segment 12, which in this case extend over an angular range of approximately 22 ° each.

Während im Scheitelbereich des Torus das zentrale Segment 10 hier in Umlaufrichtung einen zentralen Krümmungsradius 14 von 12.35 Millimetern aufweist, weisen das gelenkseitiges Segment 11 und das anschlagseitiges Segment 12 einen entsprechenden gelenkseitigen bzw. anschlagseitigen Krümmungsradius-15 bzw. 16 von 12.45 bzw. 12.55 Millimetern auf. Zudem weist das Zentrum des zentralen Krümmungsradius 14 zusätzlich einen Mittenversatz 13 von 0.3 Millimetern jenseits der Schliessebene 6 auf, wodurch - im ruhenden Zustand des Werkzeugs - die Bananenform des torusförmigen Pressbereichs 7 zusätzlich verstärkt wird. Die Zentren der gelenkseitigen und anschlagseitigen Krümmungsradien 15 und 16 liegen ebenfalls jenseits der Schliessebene 6. Durch diese spezielle Form der beiden torusförmigen Pressbereiche 7 ist - bei einem geschlossenen Presswerkzeug im ruhenden Zustand - die lichte Weite in Aufklapprichtung 8, also senkrecht zur Schliessebene 6, deutlich geringer als eine lichte Weite quer zur Aufklapprichtung 9, hier in etwa 15° geneigt zur Schliessebene 6.While in the apex region of the torus, the central segment 10 here in the circumferential direction has a central radius of curvature 14 of 12.35 millimeters, have the joint-side segment 11 and the stop-side segment 12 has a corresponding joint-side or stop-side radius of curvature-15 and 16 of 12.45 and 12.55 millimeters , In addition, the center of the central radius of curvature 14 additionally has a center offset 13 of 0.3 millimeters beyond the closing plane 6, as a result of which - in the stationary state of the tool - the banana shape of the torus-shaped pressing region 7 is additionally reinforced. The centers of the joint-side and stop-side radii of curvature 15 and 16 are also beyond the closing plane 6. This special shape of the two toroidal pressing regions 7 - in a closed pressing tool in the stationary state - the clear width in Aufklapaufichtung 8, ie perpendicular to the closing plane 6, clearly smaller than a clear width transverse to the opening 9, here inclined at about 15 ° to the closing level. 6

Der zylinderförmige Pressbereich 24, der dem Aufpressabschnitt 21 des Aufnahmeteils 1 aus Figur 1 zuordenbar ist, weist ebenfalls drei analoge Segmente mit jeweils entsprechenden, unterschiedlichen Krümmungsradien auf, deren Zentren hier mit den Zentren der Krümmungsradien des torusförmigen Pressbereichs 7 zusammenfallen. Der dritte Pressbereich 25 ist in Form einer Hälfte eines Sechskants ausgebildet.The cylindrical pressing region 24, which can be assigned to the press-on section 21 of the receiving part 1 from FIG. 1, likewise has three analogous segments, each with corresponding, different radii of curvature whose centers here coincide with the centers of the radii of curvature of the toroidal pressing region 7. The third pressing portion 25 is formed in the shape of a half of a hexagon.

Im Gegensatz dazu weist der Pressbereich einer herkömmlichen, starren Pressbacke der Nennweite DN 18 - z.B. einer "Pressbacke 18, Modell-Nr: 22992; Viega, Franz Viegner II, D-57428 Attendorn" - ein einziges konstant gekrümmtes Segment mit einem Krümmungsradius von 12.35 Millimetern auf. Die Form eines solchen Pressbereichs liegt damit schon im ruhenden Zustand innerhalb der geforderten Formtoleranz der Aussenform eines aufgepressten Aufnahmeteils.In contrast, the pressing range of a conventional, rigid pressing jaw nominal diameter DN 18 -. a "Pressjack 18, Model No: 22992; Viega, Franz Viegner II, D-57428 Attendorn" - a single constantly curved segment with a radius of curvature of 12.35 millimeters. The shape of such a pressing region is thus already in the stationary state within the required shape tolerance of the external shape of a pressed-on receiving part.

Figur 4 zeigt-eine massstäbliche Gegenüberstellung der Innenprofile desselben Presselements im ruhenden und im aufpressenden Zustand eines geschlossenen Presswerkzeugs. Dabei stellt eine durchgehende Linie 27 das Innenprofil des Presselements im ruhenden Zustand mit einem freiliegende Pressbereich dar. Eine unterbrochene Linie 28 stellt hingegen das Innenprofil desselben Presselements im aufpressenden Zustand des geschlossenen Werkzeugs dar. Mit einem derartigen Presswerkzeug können ein Aufnahmeteil mit einem Dichtabschnitt und einem Aufpressabschnitt eines "Geopress-Fittings 20-63" von der Nennweite 50 innerhalb derselben Zylinderformtoleranz aufgepresst werden. Der Pressbereich des Presselements im aufpressenden Zustand des geschlossenen Werkzeugs liegt am in Figur 4 nicht dargestellten Dicht- bzw. Aufpressabschnitt an. Die unterbrochene Linie 28 weist im Pressbereich eine im Wesentlichen konstante Krümmung auf, die der konstanten Krümmung der geforderten Aussenform des aufgepressten Dicht- bzw. Aufpressabschnitts entspricht.FIG. 4 shows a scale comparison of the inner profiles of the same pressing element in the resting and in the pressing state of a closed pressing tool. A continuous line 27 represents the inner profile of the pressing element in the stationary state with an exposed pressing area. A broken line 28, however, represents the inner profile of the same pressing element in the pressing state of the closed tool. With such a pressing tool, a receiving part with a sealing portion and a Aufpressabschnitt of a "Geopress fitting 20-63" of nominal diameter 50 are pressed within the same cylinder shape tolerance. The pressing region of the pressing element in the pressing-on state of the closed tool abuts against the sealing or pressing-on section (not shown in FIG. 4). The interrupted line 28 has a substantially constant curvature in the pressing area, which corresponds to the constant curvature of the required outer shape of the pressed-on sealing ring. or Aufpressabschnitts corresponds.

Zwischen den beiden Innenprofilen beträgt die maximale Differenz am Scheitelpunkt des Pressbereichs in Aufklapprichtung etwas mehr als einen halben Millimeter. Dies entspricht nicht ganz einem Prozent der Nennweite der Pressverbindung. Die Differenz der lichten Weite in der Schliessebene des Presswerkzeugs weist einen Wert von etwas mehr als zwei Millimetern auf, welches ca. 4 Prozent der Nennweite entspricht.Between the two inner profiles, the maximum difference at the apex of the pressing area in Aufklapprichtung is slightly more than half a millimeter. This does not correspond to one percent of the nominal diameter of the press connection. The difference of the clear width in the closing plane of the pressing tool has a value of slightly more than two millimeters, which corresponds to about 4 percent of the nominal diameter.

Claims (7)

  1. Pressing tool for connection of workpieces with cold working by pressing a receptacle part (1) of an installation element (2) onto a pipe (3) inserted into the receptacle part (1), the receptacle part (1) to be pressed on having a section (4) with an outer shape substantially constantly curved in the circumferential direction,
    - which pressing tool has two pressing elements (5) with in each case a pressing region (7) provided for resting against the section (4) of the receptacle part (1) in the working position,
    - which pressing elements (5) are connected to one another by means of a joint so as to be movable and hinged relative to one another in the manner of pliers,
    - those end pieces of the pressing elements (5) which are coordinated with one another abutting one another both on the joint side and at the other end, the stop end, in the closed position of the pressing tool,
    characterized in that
    - the pressing regions (7), in the closed, non-pressing state of the pressing tool, have, in the circumferential direction, a shape curved differently from the outer shape of the section (4) and have in each case constant curvatures differing from one another in the circumferential direction, and in that the
    - pressing elements (5) are formed so as to be elastically deformable in such a way that, in the closed, pressing state of the pressing tool, the pressing regions (7) adjacent to the section (4) are present in a substantially constantly curved shape corresponding to the outer shape.
  2. Pressing tool according to Claim 1, characterized in that, in the closed, non-pressing state of the pressing tool, the clearance between the pressing elements (5) in the opening direction (8) of the pressing tool has a smaller value than the clearance transverse to the opening direction (8).
  3. Pressing tool according to Claim 2, characterized in that each of the two pressing regions (7) has segments (10, 11, 12) with different curvatures in the circumferential direction, a segment (11) on the joint side and a segment (12) on the stop side both having in each case a greater radius of curvature than the at least one central segment (10) arranged in between, and in particular the radius of curvature of the segment (11) on the joint side being smaller than the radius of curvature of the segment (12) on the stop side.
  4. Pressing tool according to Claim 3, characterized in that - for each of the two pressing regions (7) - the centres of curvature of the segments are arranged a distance apart and in each case offset relative to a closing plane (6) definable by the joint and a stop of the two pressing elements (5) which is specified in the closed state of the pressing tool.
  5. Pressing tool according to any of the preceding Claims, characterized in that recesses in the form of planar end regions (26) having in each case an end provided with a radius and facing away from the pressing region are provided on the pressing elements (5), in each case on the joint side and stop side, adjacent to the respective pressing region (7).
  6. Pressing tool according to any of the preceding Claims, characterized in that a single bearing pin (18) is provided, by means of which the two pressing elements (5) are hinged to one another.
  7. Pressing tool according to any of the preceding Claims, the pressed-on receptacle part (1) having a further section (21), optionally within another specified shape tolerance, characterized in that each of the pressing elements (5) has a further pressing region (24) coordinated with the further section (21).
EP03025943A 2003-11-13 2003-11-13 Pressing tool Expired - Lifetime EP1531016B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
ES03025943T ES2287400T3 (en) 2003-11-13 2003-11-13 PRESSURE TOOL.
AT03025943T ATE364461T1 (en) 2003-11-13 2003-11-13 PRESSING TOOL
DE50307476T DE50307476D1 (en) 2003-11-13 2003-11-13 press tool
EP03025943A EP1531016B1 (en) 2003-11-13 2003-11-13 Pressing tool
PT03025943T PT1531016E (en) 2003-11-13 2003-11-13 Pressing tool
JP2004309169A JP4694174B2 (en) 2003-11-13 2004-10-25 Press tool
CA002486433A CA2486433A1 (en) 2003-11-13 2004-11-01 Press tool
US10/986,164 US7146839B2 (en) 2003-11-13 2004-11-12 Press tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03025943A EP1531016B1 (en) 2003-11-13 2003-11-13 Pressing tool

Publications (2)

Publication Number Publication Date
EP1531016A1 EP1531016A1 (en) 2005-05-18
EP1531016B1 true EP1531016B1 (en) 2007-06-13

Family

ID=34429339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025943A Expired - Lifetime EP1531016B1 (en) 2003-11-13 2003-11-13 Pressing tool

Country Status (8)

Country Link
US (1) US7146839B2 (en)
EP (1) EP1531016B1 (en)
JP (1) JP4694174B2 (en)
AT (1) ATE364461T1 (en)
CA (1) CA2486433A1 (en)
DE (1) DE50307476D1 (en)
ES (1) ES2287400T3 (en)
PT (1) PT1531016E (en)

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DE202006004876U1 (en) * 2006-03-28 2007-08-02 Herrle, Richard Pressing tool, press ring and pressing tongs
US20080029662A1 (en) * 2006-08-03 2008-02-07 O'rourke John F Tool holder attachment for rigid pipe tristand
US20090031778A1 (en) * 2007-08-01 2009-02-05 Emerson Electric Co. Multi-application crimping or pressing tool
US20090293577A1 (en) * 2008-05-28 2009-12-03 Emerson Electric Co. Jaw set and jaw set system with hinged jaw arms for use in a pressing tool
US8584503B1 (en) * 2012-10-09 2013-11-19 Rostra Tool Company Crimping tool
US9388885B2 (en) 2013-03-15 2016-07-12 Ideal Industries, Inc. Multi-tool transmission and attachments for rotary tool
DE102014103213B4 (en) * 2014-03-11 2015-11-26 Viega Gmbh & Co. Kg Press attachment for axial pressing of workpieces
CN109092989B (en) * 2018-06-28 2023-08-15 亿和精密工业（苏州）有限公司 Die structure for workpiece rolling forming
KR200491617Y1 (en) * 2019-01-21 2020-05-11 민우정공(주) Connecting device for piping works
US11398719B2 (en) 2019-04-30 2022-07-26 Eaton Intelligent Power Limited Press fit condulet devices, assemblies systems and methods for electrical raceway fabrication
US11996683B2 (en) 2020-10-19 2024-05-28 Eaton Intelligent Power Limited Compressible condulet devices, assemblies, systems and methods for electrical raceway fabrication
CN112571366A (en) * 2020-12-16 2021-03-30 浙江青牛智能科技有限公司 Pipeline inner pipe dragging device

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DE9314054U1 (en) 1992-11-10 1993-11-25 Geberit Ag, Jona, St.Gallen Crimping pliers for pressing pipe connections
JP2595302Y2 (en) * 1993-09-27 1999-05-31 株式会社ダイア Portable pipe splicer
US6234000B1 (en) * 1999-09-20 2001-05-22 Wiley L. Bowling Ball-bat repairing method
DE50006944D1 (en) * 1999-10-26 2004-08-05 Ridge Tool Ag Balzers Press tool and method for cold forming joining of workpieces
US6471449B1 (en) * 1999-10-28 2002-10-29 Kyocera Corporation Throw-away tip with abrasion sensor
DE19963097C5 (en) * 1999-12-24 2017-04-27 Wezag Gmbh Werkzeugfabrik Pliers for pressing a workpiece
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DE20018312U1 (en) * 2000-10-26 2001-05-10 Franz Viegener Ii Gmbh & Co Kg Press tool

Also Published As

Publication number Publication date
EP1531016A1 (en) 2005-05-18
JP4694174B2 (en) 2011-06-08
ES2287400T3 (en) 2007-12-16
PT1531016E (en) 2007-08-21
DE50307476D1 (en) 2007-07-26
CA2486433A1 (en) 2005-05-13
JP2005144556A (en) 2005-06-09
US20050145005A1 (en) 2005-07-07
ATE364461T1 (en) 2007-07-15
US7146839B2 (en) 2006-12-12

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