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EP0027224A1 - Centric-chucking device for workpieces - Google Patents

Centric-chucking device for workpieces Download PDF

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Publication number
EP0027224A1
EP0027224A1 EP80106030A EP80106030A EP0027224A1 EP 0027224 A1 EP0027224 A1 EP 0027224A1 EP 80106030 A EP80106030 A EP 80106030A EP 80106030 A EP80106030 A EP 80106030A EP 0027224 A1 EP0027224 A1 EP 0027224A1
Authority
EP
European Patent Office
Prior art keywords
clamping
lever
rope
jaws
tensioning
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.)
Granted
Application number
EP80106030A
Other languages
German (de)
French (fr)
Other versions
EP0027224B1 (en
Inventor
Gottlieb Benz
Hans-Jakob Egg
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT80106030T priority Critical patent/ATE2256T1/en
Publication of EP0027224A1 publication Critical patent/EP0027224A1/en
Application granted granted Critical
Publication of EP0027224B1 publication Critical patent/EP0027224B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B25B5/00—Clamps
    • B25B5/14—Clamps for work of special profile
    • B25B5/147—Clamps for work of special profile for pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S269/00—Work holders
    • Y10S269/902—Work holder member with v-shaped notch or groove

Definitions

  • the invention relates to a clamping device for the central clamping of workpieces having a circular cross section of different sizes, for example pipes or fittings made of plastic, with two jaws which can be simultaneously fed in the radial direction and are guided in a frame.
  • a device for the central clamping of workpieces which are circular in cross section, which is characterized in that each clamping part has a surface which bears on a surface of the other clamping part and that one of the clamping parts on one to the direction of movement of the other part sloping surface is slidably guided, the adjustment of a clamping part is carried out by means of a spindle. If workpieces with different diameters have to be clamped alternately, time-consuming movements of the clamping parts by means of the spindle are required.
  • tube vices for example DE-Gbm 1131874 or GB-PS 775 111
  • the workpiece is turned around initially held at three or four points and, due to the short line contact at these points, high surface pressures and deformations of the workpieces occur, particularly in the case of pipes made of plastic.
  • the surface pressure can be reduced, but this increases the application area of the clamping device e.g. restricted to clamping fittings with only a short cylindrical section, such as angles, etc.
  • Clamping devices for centric clamping with mostly semi-circular clamping jaws with low surface pressure adapted to the workpieces have become known (e.g. DE-AS 2212055), but these require clamping jaws which are adapted to the workpiece diameter to be clamped, which necessitates their frequent retooling.
  • the object of the present invention is to provide a clamping device of the type mentioned at the outset, by means of which workpieces with short cylindrical parts can be clamped securely, firmly and in a precisely centric position with little surface pressure between the clamping means and the workpiece and with short handling times.
  • jaws with narrow centering surfaces can be used without high specific surface pressures, whereby the quick adjustment of the jaws enables the workpiece to be centered quickly, even with alternately different workpiece diameters.
  • the workpiece is clamped evenly over the entire circumference of the workpiece by means of the flexible clamping element with low specific surface pressures.
  • the tensioning element designed as a rope enables a narrow construction of the tensioning device, whereby its guiding in recesses in the centering jaws prevents displacement transverse to the tensioning direction, so that a secure tensioning of the workpiece is ensured even with axial forces acting on the workpiece.
  • clamping lever Due to the easy hook-in of the rope and its ability to be clamped on the clamping lever, workpieces with widely differing diameters can be clamped quickly, whereby the clamping lever is spring-loaded, ensuring an approximately equally strong, definable clamping force.
  • a brief release of the clamping force for readjustment of the clamped pipe or fitting is quickly possible with a simple operation using the clamping lever with a handle.
  • a lever 4, 4a is articulated to each of the jaws 2, 2a and is each connected to a further articulated lever 5, 5a, each with a shaft 6, 6a mounted in the frame 1.
  • a gear wheel 7, 7a is fastened to each of the two shafts 6, 6a, the two gear wheels 7, 7a meshing together.
  • On a shaft 6, a hand lever 8 is rotatably arranged.
  • the levers 4, 4a, the articulated levers 5, 5a, shafts 6, 6a, gears 7, 7a and the hand lever 8 form a quick adjustment device 9 for simultaneous movement of the jaws 2, 2a designed as a centering device 10.
  • the jaws 2, 2a have centering surfaces 11 arranged in a V-shape and allow centering with a constant central position of workpieces 12 with a large area of different diameters. To expand this area, the jaws 2, 2a are easily exchangeable for a smaller or larger design.
  • a clamping device 13 which operates separately from the centering device 10, is arranged on the frame 1 with a flexible clamping element 14.
  • the flexible tensioning element can be a band or a rope 14, preferably a steel wire rope, which can be suspended at one end with a bolt 15 attached to it on one side of the frame 1.
  • the rope 14 can also be made of stretched plastic or glass fibers such as, for example be made from polyamide, polyethylene terephthalate (terylene), polyamide (Perlon, nylon) or from aromatic polyamide (Kevlar).
  • a clamping lever 16 is pivotally attached about an axis 17, which has a clamping piece 18 designed as a round disk with a guide groove 19 arranged on the circumference.
  • a clamping lever 21 which is pivotable about an axis 20 is fastened, the lower end of which, provided with a groove 22, comes to lie directly above the clamping piece 18. (See also Fig. 3)
  • Guide groove 19 and groove 22 have a shape corresponding to the cable 14 in cross section.
  • Clamping levers 16 and clamping levers 21 are provided with a handle 23 and 24 for actuation thereof.
  • a tension spring 25 is attached to the lower lever arm of the tensioning lever 16, and its other end is articulated on the frame housing in such a way that a pulling action on the rope 14 clamped between the clamping piece 18 and the clamping lever 21 above the axis 17 has a pulling action counter to that suspended by means of the bolt 15 Rope end is exercised.
  • the jaws 2, 2a have on their centering surfaces 11 and the upper peripheral surfaces 26 recesses 27, in which the cable 4 is guided and held against displacement in the vertical direction to the clamping plane.
  • the rope is wound 14 by crossing the workpiece 12 so that it comprises said at least by 360 0 and the hooked one end by means of the bolt 15 on one side of the frame. 1 With the other end, the cable 14 is pulled so far that it lies against the workpiece 12 and at the same time is axially guided in the recesses 27 of the jaws 2, 2a.
  • the clamping lever 16 is pivoted in the direction of arrow 28 by actuation on the handle 23, whereby the tension spring 25 is preloaded.
  • the cable 14 is placed in the guide groove 19 of the clamping piece 18 and clamped on the tensioning lever 16 by a pivoting movement of the clamping lever 21 in the direction of arrow 29.
  • the clamping effect is self-locking, since the tensile force on the rope 14 - generated by the force of the prestressed tension spring 25 - creates a wedge effect between the clamping lever 21, the rope 14 and the clamping piece 18.
  • the workpiece clamping can be released for a short time, which is verified by Ver pivot the clamping lever 16 in the direction of arrow 28.
  • the cable 14 is first loosened as described above and the cable clamp is released by pivoting the clamping lever 21 against the arrow direction 29. After loosening the other end of the rope from the frame 1, the rope wrap on the workpiece is released by crossing the rope back. Then the jaws 2, 2a can be moved apart after loosening their clamping by swiveling the hand lever 8 up and the workpiece can be removed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Feeding Of Workpieces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Manipulator (AREA)
  • Clamps And Clips (AREA)

Abstract

A clamping apparatus includes jaws carried by a frame and movable toward each other to center and engage a workpiece by a lever and linkage arrangement which operates quickly. The workpiece is then firmly clamped by a rope which extends from the frame around the workpiece at least 360 DEG and through a gripping device. The gripping device is urged toward the gripping position by a spring.

Description

Die Erfindung betrifft eine Spanneinrichtung zum zentrischen Spannen von, einen kreisförmigen Querschnitt unterschiedlicher Grösse aufweisenden Werkstücken, beispielsweise von Rohren oder Fittings aus Kunststoff, mit zwei in radialer Richtung gleichzeitig zustellbaren, in einem Rahmengestell geführten Backen.The invention relates to a clamping device for the central clamping of workpieces having a circular cross section of different sizes, for example pipes or fittings made of plastic, with two jaws which can be simultaneously fed in the radial direction and are guided in a frame.

Bekannt ist beispielsweise eine Vorrichtung (CH-PS 352542) zum zentrischen Spannen von im Querschnitt kreisrunden Werkstücken, welche dadurch gekennzeichnet ist, dass jeder Spannteil eine Fläche aufweist, die an einer Fläche des anderen Spannteiles anliegt und dass einer der Spannteile an einer zur Bewegungsrichtung des anderen Teiles schräg liegenden Fläche gleitend geführt ist, wobei die Verstellung eines Spannteiles mittels einer Spindel erfolgt. Müssen abwechslungsweise Werkstücke mit unterschiedlichem Durchmesser gespannt werden, sind zeitraubende Bewegungen der Spannteile mittels der Spindel erforderlich.For example, a device (CH-PS 352542) is known for the central clamping of workpieces which are circular in cross section, which is characterized in that each clamping part has a surface which bears on a surface of the other clamping part and that one of the clamping parts on one to the direction of movement of the other part sloping surface is slidably guided, the adjustment of a clamping part is carried out by means of a spindle. If workpieces with different diameters have to be clamped alternately, time-consuming movements of the clamping parts by means of the spindle are required.

Als besonders nachteilig ist bei dieser, als auch bei den als Rohr-Schraubstöcke bekannten Spannvorrichtungen (z.B. DE-Gbm 1131874 oder GB-PS 775 111) dass das Werkstück umfangsmässig nur an drei oder vier Stellen gehalten und durch die an diesen Stellen gegebene kurze Linienberührung hohe Flächenpressungen und Deformationen der Werkstücke insbesondere bei Rohren aus Kunststoff auftreten.It is particularly disadvantageous in this case, as well as in the clamping devices known as tube vices (for example DE-Gbm 1131874 or GB-PS 775 111) that the workpiece is turned around initially held at three or four points and, due to the short line contact at these points, high surface pressures and deformations of the workpieces occur, particularly in the case of pipes made of plastic.

Durch Verbreiterung der Spannbacken kann zwar die Flächenpressung verringert werden, dadurch wird jedoch der Anwendungsbereich der Spanneinrichtung z.B. zum Spannen von nur eine kurze zylindrische Partie aufweisenden Formstücken wie Winkel usw. eingeschränkt.By widening the clamping jaws, the surface pressure can be reduced, but this increases the application area of the clamping device e.g. restricted to clamping fittings with only a short cylindrical section, such as angles, etc.

Es sind zwar Spanneinrichtungen zum zentrischen Spannen mit an die Werkstücke angepassten, meist halbkreisförmigen Spannbacken mit geringer Flächenpressung bekanntgeworden (z.B. DE-AS 2212055), doch erfordern diese jeweils an die zu spannenden Werkstückdurchmesser angepasste Spannbacken, was deren oftmaliges Umrüsten bedingt.Clamping devices for centric clamping with mostly semi-circular clamping jaws with low surface pressure adapted to the workpieces have become known (e.g. DE-AS 2212055), but these require clamping jaws which are adapted to the workpiece diameter to be clamped, which necessitates their frequent retooling.

Im weiteren Zusammenhang sind zwar zur Erreichung geringer spezifischer Spannbelastungen Spanneinrichtungen mit das Werkstück jeweils in einer Querschnittebene nur teilweise umfassenden Spannbändern bekanntgeworden (z..B. US-PS 3 661-378, GB-PS 860 754, US-PS 1 644 755), jedoch ist mit- diesen Einrichtungen ein zentrisches Spannen von im Durchmesser unterschiedlichen runden Werkstücken nicht möglich.In the broader context, to achieve low specific clamping loads, clamping devices with clamping belts that only partially encompass the workpiece in each case in a cross-sectional plane have become known (e.g. US Pat. No. 3,661-378, GB Pat. No. 860,754, US Pat. No. 1,644,755). However, with these devices a central clamping of round workpieces with different diameters is not possible.

Aufgabe der vorliegenden Erfindung ist die Schaffung einer Spanneinrichtung der eingangs genannten Art, mittels welcher auch Werkstücke mit kurzen zylindrischen Partien-bei geringer Flächenpressung zwischen Spannmittel und Werkstück und bei kurzen Handhabungszeiten sicher, fest und in genauer zentrischen Lage gespannt werden können.The object of the present invention is to provide a clamping device of the type mentioned at the outset, by means of which workpieces with short cylindrical parts can be clamped securely, firmly and in a precisely centric position with little surface pressure between the clamping means and the workpiece and with short handling times.

Zur Lösung der Aufgabe sind die im kennzeichnenden Teil des Anspruches 1 angegebenen Gestaltungsmerkmale für die Erfindung vorgesehen.To achieve the object, the design features specified in the characterizing part of claim 1 are provided for the invention.

Bevorzugte Ausführungsformen ergeben sich nach den weiteren Ansprüchen.Preferred embodiments result from the further claims.

Da bei der Zentrierung des Werkstückes kein nennenswerter Druck auf das Werkstück entsteht, können Backen mit schmalen Zentrierungsflächen verwendet werden, ohne dass hohe spezifische Flächenpressungen auftreten, wobei die Schnellverstellung der Backen ein rasches Zentrieren der Werkstücke auch bei abwechselnd unterschiedlichen Werkstückdurchmessern ermöglicht. Die Werkstückspannung erfolgt gleichmässig am gesamten Umfang des Werkstückes mittels des biegsamen Spannelementes bei geringen spezifischen Flächenpressungen. Das als Seil ausgebildete Spannelement ermöglicht eine schmale Bauweise der Spanneinrichtung, wobei durch dessen Führung in Ausnehmungen der Zentrierbacken ein Verschieben quer zur Spannrichtung verhindert wird, so dass auch bei auf das Werkstück wirkenden axialen Kräften eine sichere Spannung des Werkstückes gewährleistet ist.Since there is no significant pressure on the workpiece when centering the workpiece, jaws with narrow centering surfaces can be used without high specific surface pressures, whereby the quick adjustment of the jaws enables the workpiece to be centered quickly, even with alternately different workpiece diameters. The workpiece is clamped evenly over the entire circumference of the workpiece by means of the flexible clamping element with low specific surface pressures. The tensioning element designed as a rope enables a narrow construction of the tensioning device, whereby its guiding in recesses in the centering jaws prevents displacement transverse to the tensioning direction, so that a secure tensioning of the workpiece is ensured even with axial forces acting on the workpiece.

Durch die leichte Einhängbarkeit des Seiles und dessen Anklemmbarkeit am Spannhebel können auch im Durchmesser stark unterschiedliche Werkstücke rasch gespannt werden, wobei durch den Federzug des Spannhebels jeweils eine annähernd gleich starke, festlegbare Spannkraft gewährleistet ist.Due to the easy hook-in of the rope and its ability to be clamped on the clamping lever, workpieces with widely differing diameters can be clamped quickly, whereby the clamping lever is spring-loaded, ensuring an approximately equally strong, definable clamping force.

Ein kurzzeitiges Lösen der Spannkraft zum Nachjustieren.des eingespannten Rohres bzw. Fittings ist mittels des einen Handgriff aufweisenden Spannhebels durch eine einfache Betätigung rasch möglich.A brief release of the clamping force for readjustment of the clamped pipe or fitting is quickly possible with a simple operation using the clamping lever with a handle.

Nachstehend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing.

Es zeigen:

  • Fig. 1 eine Vorderansicht einer Spannvorrichtung, teilweise im Schnitt,
  • Fig. 2 eine Draufsicht von Fig. l,
  • Fig. 3 eine perspektivische Darstellung einer Teilansicht mit dem Spannhebel von Fig..l.
Show it:
  • 1 is a front view of a clamping device, partly in section,
  • 2 is a plan view of FIG. 1,
  • Fig. 3 is a perspective view of a partial view with the clamping lever of Fig..l.

In einem Rahmengestell 1 sind zwei symmetrisch ausgebildete Backen 2, 2a horizontal verschiebbar angeordnet und in Führungen 3 genau geführt. An jedem der Backen 2, 2a ist ein Hebel 4, 4a gelenkig befestigt, welcher jeweils mit einem weiteren Gelenkhebel 5, 5a mit je einer im Rahmengestell 1 gelagerten Welle 6, 6awirkverbunden ist. An jeder der beiden Wellen 6, 6a ist ein Zahnrad 7, 7a befestigt, wobei beide Zahnräder 7, 7a zusammen kämmen. An einer Welle 6 ist drehfest ein Handhebel 8 angeordnet. Die Hebel 4, 4a, die Gelenkhebel 5, 5a, Wellen 6, 6a, Zahnräder 7, 7a und der Handhebel 8 bilden eine Schnellverstellvorrichtung 9 für ein gleichzeitige Zu- bzw. Aufbewegung der als Zentriervorrichtung 10 ausgebildeten Backen 2, 2a. Die Backen 2, 2a weisen v-förmig angeordnete Zentrierflächen 11 auf und ermöglichen die Zentrierung bei gleichbleibender Mittellage von Werkstücken 12 mit einem grossen Bereich unterschiedlicher Durchmesser. Zur Erweiterung dieses Bereiches sind die Backen 2, 2a gegen eine kleinere oder grössere Ausführungsart leicht auswechselbar.In a frame 1, two symmetrically formed jaws 2, 2a are arranged horizontally displaceable and precisely guided in guides 3. A lever 4, 4a is articulated to each of the jaws 2, 2a and is each connected to a further articulated lever 5, 5a, each with a shaft 6, 6a mounted in the frame 1. A gear wheel 7, 7a is fastened to each of the two shafts 6, 6a, the two gear wheels 7, 7a meshing together. On a shaft 6, a hand lever 8 is rotatably arranged. The levers 4, 4a, the articulated levers 5, 5a, shafts 6, 6a, gears 7, 7a and the hand lever 8 form a quick adjustment device 9 for simultaneous movement of the jaws 2, 2a designed as a centering device 10. The jaws 2, 2a have centering surfaces 11 arranged in a V-shape and allow centering with a constant central position of workpieces 12 with a large area of different diameters. To expand this area, the jaws 2, 2a are easily exchangeable for a smaller or larger design.

Für die Spannung des Werkstückes 12 ist eine getrennt von der Zentriervorrichtung 10 arbeitende Spannvorrichtung 13 mit einem biegsamen Spannelement 14 am Rahmengestell 1 angeordnet. Das biegsame Spannelement kann ein Band oder ein Seil 14, vorzugsweise ein Stahldrahtseil sein, welches mit einem Ende mit einem daran befestigten Bolzen 15 an einer Seite des Rahmengestells 1 einhängbar ist.Das Seil 14 kann auch aus gereckten Kunststoff- oder Glas-Fasern wie z.B. aus Polyamid, Polyaethylenterephtalat (Terylene), Polyamid (Perlon, Nylon) oder aus aromatischem Polyamid (Kevlar) hergestellt sein. An der gegenüberliegenden Seite des Rahmengestells 1 ist ein Spannhebel 16 um eine Achse 17 schwenkbar befestigt, welcher ein als runde Scheibe ausgebildetes Klemmstück 18 mit einer am Umfang angeordneten Führungsnute 19 aufweist. Am oberen Hebelarm des Spannhebels 16 ist ein um eine Achse 20 schwenkbarer Klemmhebel 21 befestigt, dessen unteres Ende mit einer Nute 22 versehen unmittelbar über dem Klemmstück 18 zu liegen kommt. (Siehe auch Fig. 3)For the clamping of the workpiece 12, a clamping device 13, which operates separately from the centering device 10, is arranged on the frame 1 with a flexible clamping element 14. The flexible tensioning element can be a band or a rope 14, preferably a steel wire rope, which can be suspended at one end with a bolt 15 attached to it on one side of the frame 1. The rope 14 can also be made of stretched plastic or glass fibers such as, for example be made from polyamide, polyethylene terephthalate (terylene), polyamide (Perlon, nylon) or from aromatic polyamide (Kevlar). On the opposite side of the frame 1, a clamping lever 16 is pivotally attached about an axis 17, which has a clamping piece 18 designed as a round disk with a guide groove 19 arranged on the circumference. On the upper lever arm of the tensioning lever 16, a clamping lever 21 which is pivotable about an axis 20 is fastened, the lower end of which, provided with a groove 22, comes to lie directly above the clamping piece 18. (See also Fig. 3)

Führungsnute 19 und Nute 22 weisen im Querschnitt eine dem Seil 14 entsprechende Form auf. Spannhebel 16 und Klemmhebel 21 sind zu deren Betätigung mit je einem Handgriff 23 bzw. 24 versehen.Guide groove 19 and groove 22 have a shape corresponding to the cable 14 in cross section. Clamping levers 16 and clamping levers 21 are provided with a handle 23 and 24 for actuation thereof.

Am unteren Hebelarm des. Spannhebels 16 ist eine Zugfeder 25 eingehängt, welche mit ihrem anderem-Ende so am Rahmengehäuse angelenkt ist, dass auf das oberhalb der Achse 17 zwischen Klemmstück 18 und Klemmhebel 21 eingeklemmte Seil 14 eine Zugwirkung entgegen dem mittels des Bolzens 15 eingehängten Seilende ausgeübt wird.A tension spring 25 is attached to the lower lever arm of the tensioning lever 16, and its other end is articulated on the frame housing in such a way that a pulling action on the rope 14 clamped between the clamping piece 18 and the clamping lever 21 above the axis 17 has a pulling action counter to that suspended by means of the bolt 15 Rope end is exercised.

Die Backen 2, 2a weisen an ihren Zentrierflächen 11 und den oberen Umfangsflächen 26 Ausnehmungen 27 auf, in welchen das Seil 4 geführt und gegen Verschieben in senkrechte Richtung zur Spannebene gehalten ist.The jaws 2, 2a have on their centering surfaces 11 and the upper peripheral surfaces 26 recesses 27, in which the cable 4 is guided and held against displacement in the vertical direction to the clamping plane.

Der Spannvorgang eines im Querschnitt runden Werkstückes mittels der vorgängig beschriebenen Einrichtung ist wie folgt:

  • Die beiden Backen 2 und 2a werden durch Hochschwenken des Handhebels 8 entsprechend dem Pfeil 30 soweit geöffnet, dass das Werkstück 12 von oben oder in axialer Richtung zwischen die Backen eingelegt werden kann. Das Seil 14 muss dabei unterhalb dem Werkstück und seitlich in den Ausnehmungen 27 der Backen 2, 2a liegen. Durch Abwärtsschwenken entgegen dem Pfeil 30 des Handhebels 8 werden die Backen 2, 2a gleichmässig bis zur Anlage der Zentrierflächen 11 am Werkstück 12 zusammengefahren, wodurch das Werkstück in einer zentrischen Lage fixiert wird. Ist die Schnellverstelleinrichtung 9 dabei selbsthemmend und mit geringem . Spiel ausgebildet, kann auf eine zusätzliche weiter nicht dargestellte Festklemmung der Backen 2, 2a z.B. in den Führungen 3 verzichtet werden. Ist jedoch eine Klemmeinrichtung vorhanden, muss diese vor dem Spannvorgang betätigt werden.
The clamping process of a workpiece with a round cross section using the device described above is as follows:
  • The two jaws 2 and 2a are opened by swiveling the hand lever 8 up according to the arrow 30 to such an extent that the workpiece 12 from above or in the axial direction can be inserted between the jaws. The rope 14 must lie below the workpiece and laterally in the recesses 27 of the jaws 2, 2a. By swiveling downward against the arrow 30 of the hand lever 8, the jaws 2, 2a are moved together evenly until the centering surfaces 11 rest on the workpiece 12, as a result of which the workpiece is fixed in a central position. The quick adjustment device 9 is self-locking and low. Formed game, an additional clamping, not shown, of the jaws 2, 2a, for example in the guides 3, can be dispensed with. However, if a clamping device is available, it must be operated before the clamping process.

Anschliessend wird das Seil 14 durch Kreuzen um das Werkstück 12 geschlungen, so dass es dieses mindestens um 3600 umfasst und das eine Ende mittels des Bolzens 15 an einer Seite des Rahmengestells 1 eingehängt. Mit dem anderen Ende wird das Seil 14 soweit nachgezogen, dass es am Werkstück 12 anliegt und gleichzeitig in den Ausnehmungen 27 der Backen 2, 2a axial geführt ist.Then the rope is wound 14 by crossing the workpiece 12 so that it comprises said at least by 360 0 and the hooked one end by means of the bolt 15 on one side of the frame. 1 With the other end, the cable 14 is pulled so far that it lies against the workpiece 12 and at the same time is axially guided in the recesses 27 of the jaws 2, 2a.

Danach wird der Spannhebel 16 durch Betätigung am Handgriff 23 in Richtung des Pfeiles 28 verschwenkt, wodurch die Zugfeder 25 vorgespannt wird. In dieser Stellung des Spannhebels 16 wird das Seil 14 in die Führungsnute 19 des Klemmstückes 18 gelegt und durch eine Schwenkbewegung des Klemmhebels 21 in Richtung des Pfeiles 29 am Spannhebel 16 angeklemmt.Thereafter, the clamping lever 16 is pivoted in the direction of arrow 28 by actuation on the handle 23, whereby the tension spring 25 is preloaded. In this position of the tensioning lever 16, the cable 14 is placed in the guide groove 19 of the clamping piece 18 and clamped on the tensioning lever 16 by a pivoting movement of the clamping lever 21 in the direction of arrow 29.

Die Klemmwirkung ist selbsthemmend, da durch die Zugkraft am Seil 14 - erzeugt durch die Kraft der vorgespannten Zugfeder 25 - zwischen dem Klemmhebel 21, dem Seil 14 und dem Klemmstück 18 eine Keilwirkung entsteht. Zum Nachjustieren des Werkstückes z.B. in axialer Richtung kann die Werkstückspannung kurzzeitig gelöst werden, was durch Verschwenken des Spannhebels 16 in Richtung des Pfeiles 28 erfolgt.The clamping effect is self-locking, since the tensile force on the rope 14 - generated by the force of the prestressed tension spring 25 - creates a wedge effect between the clamping lever 21, the rope 14 and the clamping piece 18. To readjust the workpiece, for example in the axial direction, the workpiece clamping can be released for a short time, which is verified by Ver pivot the clamping lever 16 in the direction of arrow 28.

Soll das Werkstück wieder aus der Spanneinrichtung herausgenommen werden, wird ebenfalls zuerst das Seil 14 wie vorangehend beschrieben gelockert und durch Verschwenken des Klemmhebels 21 entgegen der Pfeilrichtung 29 die Seilklemmung gelöst. Nach Lösen des anderen Seilendes vom Rahmengestell 1 wird die Seilumschlingung am Werkstück durch Zurückkreuzen des Seiles gelöst. Anschliessend können die Backen 2, 2a nach Lösen deren Festklemmung durch Hochschwenken des Handhebels 8 auseinandergefahren werden und das Werkstück herausgenommen werden.If the workpiece is to be removed from the clamping device again, the cable 14 is first loosened as described above and the cable clamp is released by pivoting the clamping lever 21 against the arrow direction 29. After loosening the other end of the rope from the frame 1, the rope wrap on the workpiece is released by crossing the rope back. Then the jaws 2, 2a can be moved apart after loosening their clamping by swiveling the hand lever 8 up and the workpiece can be removed.

Mit Hilfe von zwei erfindungsgemäss ausgebildeten Spanneinrichtungen, von denen jede auf einem Schlitten über einer gemeinsamen Führungsbahn hin- und herbewegbar ist, können nunmehr vorteilhafterweise kreisförmige Werkstücke mit unterschiedlichem Durchmesser insbesondere Kunststoffrohre oder Fittinge, auf einfache Weise genau zentrisch gespannt, koaxial zueinander bewegt und miteinander verschweisst werden.With the aid of two clamping devices designed according to the invention, each of which can be moved back and forth on a slide over a common guideway, circular workpieces with different diameters, in particular plastic pipes or fittings, can now advantageously be clamped exactly centrally, moved coaxially to one another and welded to one another will.

Durch die Verteilung der Spannkraft auf den gesamten Werkstückumfang mittels eines relativ dünnen Seiles aus Stahldraht oder Kunststoff wird eine schmale Bauweise der gesamten Spanneinrichtung erreicht, wodurch auch Fittings mit kurzen zylindrischen Partien einwandfrei zentrisch gespannt werden können.By distributing the clamping force over the entire workpiece circumference by means of a relatively thin steel wire or plastic rope, a narrow construction of the entire clamping device is achieved, as a result of which fittings with short cylindrical sections can also be clamped perfectly and centrally.

Claims (14)

l. Spanneinrichtung zum zentrischen Spannen von einem kreisförmigen Querschnitt unterschiedlicher Grösse aufweisenden Werkstücken, beispielsweise von Rohren und Fittings aus Kunststoff, mit zwei in radialer Richtung gleichzeitig zustellbaren, in einem Rahmengestell geführten Backen, dadurch gekennzeichnet, dass die als Zentriervorrichtung (10) ausgebildeten Backen (2, 2a) mit einer Schnellverstelleinrichtung (9) versehen sind und dass als Spannvorrichtung (13) ein das Werkstück (12) mit mindestens um 360° umschlingendes biegsames Spannelement (14) angeordnet ist.l. Clamping device for the central clamping of workpieces having a circular cross-section of different sizes, for example of pipes and fittings made of plastic, with two jaws which can be simultaneously fed in the radial direction and are guided in a frame, characterized in that the jaws (2, 2) designed as a centering device (10) 2a) are provided with a quick adjustment device (9) and that a flexible clamping element (14) which wraps around the workpiece (12) with at least 360 ° is arranged as the clamping device (13). 2. Spanneinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Spannelement (14) ein Seil (14) ist.2. Clamping device according to claim 1, characterized in that the clamping element (14) is a rope (14). 3. Spanneinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Seil (14) in Ausnehmungen (27) der Backen (2, 2a) geführt angeordnet ist.3. Clamping device according to claim 2, characterized in that the rope (14) is arranged in recesses (27) of the jaws (2, 2a). 4. Spanneinrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das Seil (14) mit einem Ende leicht abnehmbar an einer Seite des Rahmengestells (1) einhängbar ist.4. Tensioning device according to claim 2 or 3, characterized in that the rope (14) can be easily removed at one end on one side of the frame (1). 5. Spanneinrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass das Seil (14) mittels eines durch Federzug verschwenkbaren Spannhebels (16) spannbar ist.5. Tensioning device according to one of claims 2 to 4, characterized in that the rope (14) can be tensioned by means of a tensioning lever (16) which can be pivoted by spring tension. 6. Spanneinrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Seil (14) mit entsprechend dem Werkstückdurchmesser erforderlichen Länge an den Spannhebel (16) anklemmbar ist.6. Clamping device according to claim 5, characterized in that the cable (14) with the length required according to the workpiece diameter to the clamping lever (16) is clampable. 7. Spanneinrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Spannhebel (16) einen verschwenkbaren Klemmhebel (21) und ein mit einer Führungsnute (19) versehenes Klemmstück (18) aufweist und das Seil (14) zwischen dem Klemmhebel (21) und dem Klemmstück (18) verklemmbar angeordnet ist.7. Tensioning device according to claim 6, characterized in that the tensioning lever (16) has a pivotable clamping lever (21) and a clamping piece (18) provided with a guide groove (19) and the cable (14) between the clamping lever (21) and the Clamping piece (18) is arranged such that it can be clamped. 8. Spanneinrichtung nach Anspruch 5 und 7, dadurch gekennzeichnet, dass der Spannhebel (16) und der Klemmhebel (19) je einen Handgriff (23, 24) aufweisen.8. Clamping device according to claim 5 and 7, characterized in that the clamping lever (16) and the clamping lever (19) each have a handle (23, 24). 9. Spanneinrichtung nach Anspruch 1 oder einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass die Schnellverstellvorrichtung (19) mittels einem mit einer Welle (6) drehfest verbundenen Handhebel (8) betätigbar ist, wobei die Welle (6) zwecks gleichmässiger Verschiebung mit den Backen (2, 2a) wirkverbunden ist.9. Clamping device according to claim 1 or one of claims 2 to 8, characterized in that the quick adjustment device (19) by means of a shaft (6) rotatably connected hand lever (8) can be actuated, the shaft (6) for the purpose of uniform displacement with the jaws (2, 2a) are operatively connected. 10. Spanneinrichtung nach Anspruch 9, dadurch gekennzeichnet, dass für die Verschiebung jeder Backe (2, 2a) eine Welle (6, 6a) angeordnet ist, welche durch auf den Wellen (6, 6a) befestigten Zahnrädern (7, 7a) miteinander drehverbunden sind.10. Clamping device according to claim 9, characterized in that a shaft (6, 6a) is arranged for the displacement of each jaw (2, 2a), which is rotatably connected to one another by gearwheels (7, 7a) fastened on the shafts (6, 6a) are. 11. Spanneinrichtung nach Anspruch lO, dadurch gekennzeichnet, dass an jeder Welle (6, 6a) ein Gelenkhebel (5, 5a) drehfest angeordnet ist, welcher jeweils mittels eines Hebels (4, 4a) mit jeweils einem Backen (2, 2a) gelenkig verbunden ist.11. Clamping device according to claim 10, characterized in that on each shaft (6, 6a) an articulated lever (5, 5a) is arranged in a rotationally fixed manner, each of which is articulated by means of a lever (4, 4a) with one jaw each (2, 2a) connected is. 12. Spanneinrichtung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Backen (2, 2a) am Rahmengestell (1) festklemmbar sind.12. Clamping device according to one of claims 1 to 11, characterized in that the jaws (2, 2a) on the frame (1) can be clamped. 13. Spanneinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Seil (14) ein Stahldrahtseil ist.13. Tensioning device according to claim 2, characterized in that the rope (14) is a steel wire rope. 14. Spanneinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Seil (14) aus gereckten Kunststoff-oder Glasfasern besteht.14. Tensioning device according to claim 2, characterized in that the rope (14) consists of stretched plastic or glass fibers.
EP80106030A 1979-10-11 1980-10-04 Centric-chucking device for workpieces Expired EP0027224B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106030T ATE2256T1 (en) 1979-10-11 1980-10-04 CLAMPING DEVICE FOR CENTRIC CLAMPING OF WORKPIECES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH916379 1979-10-11
CH9163/79 1979-10-11

Publications (2)

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EP0027224A1 true EP0027224A1 (en) 1981-04-22
EP0027224B1 EP0027224B1 (en) 1983-01-19

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ID=4349025

Family Applications (1)

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EP80106030A Expired EP0027224B1 (en) 1979-10-11 1980-10-04 Centric-chucking device for workpieces

Country Status (5)

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US (1) US4339116A (en)
EP (1) EP0027224B1 (en)
JP (1) JPS56102481A (en)
AT (1) ATE2256T1 (en)
DE (2) DE7932465U1 (en)

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EP0218991A2 (en) * 1985-10-05 1987-04-22 HOMBAK Maschinenfabrik GmbH u. Co KG Centering and clamping device for elongated cylindrical objects with different diameters
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FR2503600A1 (en) * 1981-04-10 1982-10-15 Calibracier Holder for lashing cluster bars in saw - uses lever actuated by screw to tension anchored binder around cluster located by notch in sub-frame
EP0218991A2 (en) * 1985-10-05 1987-04-22 HOMBAK Maschinenfabrik GmbH u. Co KG Centering and clamping device for elongated cylindrical objects with different diameters
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CN103386661A (en) * 2013-07-29 2013-11-13 张家港化工机械股份有限公司 Quick-opening clamp for pressure test of U-shaped heat exchange tube
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CN105965388A (en) * 2016-05-05 2016-09-28 泉州鲤城福辉汽车配件有限公司 Work-piece clamping device of numerically-controlled brake camshaft grinding machine
CN105965388B (en) * 2016-05-05 2019-03-26 泉州鲤城福辉汽车配件有限公司 A kind of numerical controlled brake camshaft grinding machine work holder
CN111633276A (en) * 2020-05-28 2020-09-08 深圳市琦美创科技有限公司 Cutting device for irregular metal workpiece
CN111633276B (en) * 2020-05-28 2021-05-25 赣州大广过滤设备有限公司 Cutting device for irregular metal workpiece

Also Published As

Publication number Publication date
ATE2256T1 (en) 1983-02-15
JPS56102481A (en) 1981-08-15
DE7932465U1 (en) 1980-02-21
EP0027224B1 (en) 1983-01-19
US4339116A (en) 1982-07-13
DE3061692D1 (en) 1983-02-24

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