DE202010000402U1 - Pressing device with a simplified structure - Google Patents

Abstract

Pressing device (100) for radially compressing workpieces, comprising:
a) two lever arms (110) which are coupled together in a joint (G) and which have on their inner side in each case at least one guide surface (F);
b) at least two pressing jaws (120), one of which is displaceably mounted on one of the guide surfaces (F) of the lever arms;
c) coupling elements (130) which are arranged at the free ends of the lever arms and to which a drive device for compressing the lever arms can be coupled.

Description

The The invention relates to a pressing device for radial pressing of workpieces, in particular pipes or fittings for pipes.

From the EP 627 273 B1 a pressing device is known in which two pressing jaws are mounted in the circumferential direction displaceably movable within a pressing ring, wherein the pressing ring is formed by a tension spring or articulated circular arc segments. Another pressing jaw is fixedly arranged on the pressing ring. A disadvantage of this and similar pressing devices is that they have a relatively complicated and therefore expensive to manufacture in construction.

In front In this context, it was an object of the present invention to provide a To provide pressing device, which has a simplified structure has and is inexpensive to produce.

These Task is solved by a pressing device according to claim 1. Advantageous embodiments are in the subclaims contain.

• a) Zwei Hebelarme, die in einem Gelenk beweglich miteinander gekoppelt sind und die an ihrer Innenseite jeweils mindestens eine Führungsfläche haben. Die ”Innenseiten” der Hebelarme sind dabei definitionsgemäß die Seiten, welche die verbundenen Hebelarme (im Gebrauchszustand) einander zuwenden.
• b) Mindestens zwei Pressbacken, von denen je eine an einer der genannten Führungsflächen der Hebelarme verschiebebeweglich gelagert ist. Alle Pressbacken gemeinsam umschließen so einen Pressraum, in welchen ein Werkstück eingeführt und dann radial verpresst werden kann.
• c) Kopplungselemente, die an den freien Enden der Hebelarme angeordnet sind und an denen eine Antriebsvorrichtung zum Zusammenpressen der Hebelarme angeordnet werden kann. Antriebsvorrichtungen hydraulischer, elektrischer oder sonstiger Bauart, mit denen Komponenten einer Pressvorrichtung mit hoher Kraft zusammengedrückt (oder auseinandergepresst) werden können, sind im Stand der Technik bekannt. Die Kopplungselemente sind so ausgebildet, dass sie mit einer derartigen Antriebsvorrichtung zusammenwirken können. Die Kopplungselemente können beispielsweise Stifte, Vorsprünge oder Ausnehmungen umfassen, an welchen Backen einer Antriebsvorrichtung ansetzen können.

The pressing device according to the invention serves for the radial compression of workpieces and contains the following components:

• a) two lever arms which are movably coupled together in a joint and which have on their inner side in each case at least one guide surface. The "inner sides" of the lever arms are by definition the sides which turn the connected lever arms (in use) each other.
• b) At least two pressing jaws, one of which is displaceably mounted on one of the said guide surfaces of the lever arms. All pressing jaws together so enclose a pressing space in which a workpiece can be inserted and then pressed radially.
• c) coupling elements which are arranged at the free ends of the lever arms and on which a drive device for compressing the lever arms can be arranged. Driving devices of hydraulic, electrical or other type, with which components of a pressing device with high force can be compressed (or pressed apart), are known in the art. The coupling elements are designed so that they can cooperate with such a drive device. The coupling elements may comprise, for example, pins, projections or recesses on which jaws of a drive device can begin.

With The press device described can be in a simple Way of producing good compression of workpieces, because all press jaws are mounted displaceably. The pressing jaws can therefore according to the forces occurring by itself assume their optimal positions in which the pressing forces on the workpiece as evenly as possible act. The pressing device has a very simple at the same time Construction, since only two lever arms are needed to the required forces of a drive device to transfer to the press jaws.

According to one preferred embodiment comprises at least one of Lever arms on its inside two at an angle to each other standing (straight or curved) guide surfaces. The mentioned angle between the guide surfaces is preferably in a range of 50 ° to 120 °, most preferably it is about 90 °.

at the aforementioned embodiment includes the pressing device preferably (at least) two pressing jaws, one each on one of the guide surfaces of the lever arm verschiebebeweglich is stored. This makes it possible for the pressing jaws a to give a force directed to a center. Preferably are two guide surfaces on both lever arms formed so that the pressing device as a whole (at least) contains four pressing jaws.

According to one preferred embodiment of the pressing device are the Lever arms of similar design.

According to one Another preferred embodiment of the pressing device are the pressing jaws contained in the same design.

The above-described similar design of the lever arms and / or Pressing the pressing device allows a significant reduction the production costs, because of the use of identical parts the production costs decrease.

The Outer contour of the lever arms of the pressing device has advantageously the shape of a circular arc. This allows the lever arms starting from turned parts, which are comparatively cost-effectively produced.

There are various possibilities for the storage of the pressing jaws on the lever arms. In particular, the pressing jaws may be mounted on the lever arms via webs, which engage in grooves. This storage can advantageously be designed so that it causes an axial guidance of the pressing jaws. Concretely, the lever arms, for example, on their inner sides radially inwardly projecting webs, on which the press Baking are stored. The end faces of the webs preferably form the guide surfaces. In a mirror-inverted arrangement, of course, the webs may be provided on the pressing jaws and the grooves on the lever arms.

Preferably the pressing jaws are captively stored on the lever arms, so they do not open when the press device is opened unwanted way of the lever arms can solve.

The Pressing forces are usually provided by a drive device transferred to the lever arms and of these directly to the pressing jaws. Additionally or alternatively, a transmission of (Press) forces between the cheeks done. To this Purpose, the press jaws preferably contact surfaces, over which they can contact and transfer the forces mentioned. The contact surfaces typically run in radial Direction (relative to the press center of the device), so that the transferable forces in the first place tangential to the pressing space.

For the formation of the joint in which the lever arms are connected, There are different possibilities. For example, could the lever arms are directly hinged together via a Bolt, which through aligned eye openings in the levers goes. Preferably, however, the joint is replaced by at least one Lug formed, the hinged at their ends, each with a lever arm connected is. Such a joint has the advantage that the pivot points the lever arms pulled apart by the length of the tab which makes the movement of the lever arms stronger one (anti-) parallel movement is similar. Furthermore, one facilitates such joint the use of similarly designed lever arms.

in the The invention will be exemplified with the aid of the figures explained. Showing:

1 a perspective view of a pressing device according to the invention;

2 a view from above of the pressing device;

3 a view from below of the pressing device;

4 a side view of the pressing device;

5 a section along the line VV of 4 ;

6 a top view (top left), two perspective views (top center, right), a section (bottom left) and a side view of a lever arm of the pressing device;

7 two perspective views of a pressing jaw of the pressing device;

8th two perspective views of a tab of the pressing device.

• 1. Zwei identisch ausgebildete und spiegelbildlich zueinander angeordnete Hebelarme 110, die in einem Gelenk G über Bolzen 160 schwenkbeweglich miteinander gekoppelt sind.
• 2. Vier Pressbacken 120, von denen je zwei an der Innenseite eines Hebelarmes 110 verschiebebeweglich gelagert sind, wobei die vier Pressbacken gemeinsam einen kreisförmigen Pressraum R umschließen.
• 3. Zwei Laschen 140, mit denen die nichtfreien Enden der Hebelarme 110 unter Ausbildung des Gelenkes G miteinander gekoppelt sind.

The pressing device exemplified in the figures 100 according to the present invention essentially contains the following components:

• 1. Two identically formed and mirror images of each other arranged lever arms 110 in a joint G over bolt 160 are pivotally coupled together.
• 2. Four pressing jaws 120 of which two each on the inside of a lever arm 110 are displaceably mounted, wherein the four pressing jaws together enclose a circular pressing space R.
• 3. Two tabs 140 with which the non-free ends of the lever arms 110 are coupled together under formation of the joint G.

The mentioned three parts (lever arms, press jaws, tabs) can advantageously be designed identically, whereby the pressing device 100 especially inexpensive to produce.

The lever arms 110 Furthermore, preferably have a circular arc-shaped outer contour U. They can then be produced inexpensively from turned parts.

As in particular from 5 is recognizable, have the lever arms 110 on their inner sides in each case two at an angle α to each other standing guide surfaces F, along which the pressing jaws 120 can slide. In the illustrated example, the angle α has the preferred value of 90 °, but other values would be possible.

Different as shown could be the guide surfaces also have a continuous curvature, z. B. the Curvature of a circular arc, along which the (preferably complementarily shaped) press jaws slide.

In the closed state of the pressing device are the guide surfaces F preferably at an angle of 45 ° to the symmetry axis S of the pressing device ( 3 ). When the two lever arms 110 move towards each other during a pressing process, the pressing jaws wander 120 radially inwardly into the pressing space R, where they bear against a workpiece located there (not shown) and this press radially inwardly. At the sem pressing process, the pressing jaws 120 Walk under the play of the forces in the tangential direction along the guide surfaces F (see double arrow B) and thus ensure the most uniform possible impact of the pressing forces.

To other movements of the pressing jaws 120 as the tangential movements along the guide surfaces to prevent F, the pressing jaws are on bars 112 mounted, which radially inwardly from the inner sides of the lever arms 110 protrude. In particular, the pressing jaws are thereby fixed in the axial direction (ie perpendicular to the plane in FIG 2 . 3 . 5 ). A captive storage on the webs 112 is further achieved by the fact that from the webs 112 outgoing protrusions or pins 111 slots 121 in the press jaws ( 2 ).

At their free ends, the lever arms 110 coupling elements 130 on which an example hydraulically operated drive device (not shown) can attack to the lever arms 110 compress with sufficient force. As shown, the coupling elements can be formed, for example, by recesses into which jaws of a drive device can engage. Suitable drive devices are known in the prior art in different embodiments (see. EP 2080592 A1 ).

In 5 are corresponding holes 142 and 113 in the tabs 140 or lever arms 110 recognizable. In these holes can be arranged as a spring element, a compression spring (not shown), which the lever arms 110 in the closed position ( 2 . 3 ). Alternatively, other types of spring elements could be provided, for example a leg spring (not shown).

Further shows 3 a cover plate 150 , which is arranged at the back of the joint. This cover plate 150 has an inner contour (partially) defining the edge of the pressing space R with such dimensions that it only fits around a pipe to be pressed, but not around the somewhat thicker fitting for this pipe. The cover plate therefore acts as a teaching with which the correct placement of the pressing device can be ensured on a pipe fitting combination.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 627273 B1 [0002]
• - EP 2080592 A1 [0033]

Claims (10)

Pressing device ( 100 ) for radially compressing workpieces, comprising: a) two lever arms ( 110 ), which are coupled together in a joint (G) and which have on their inner side at least one guide surface (F); b) at least two pressing jaws ( 120 ), one of which is displaceably movably mounted on one of the guide surfaces (F) of the lever arms; c) coupling elements ( 130 ), which are arranged at the free ends of the lever arms and to which a drive device for compressing the lever arms can be coupled. Pressing device ( 100 ) according to claim 1, characterized in that at least one of the lever arms ( 110 ) has on its inside two at an angle (α) mutually standing guide surfaces (F). Pressing device ( 100 ) according to claim 2, characterized in that a respective pressing jaw ( 120 ) is displaceably mounted on one of the guide surfaces (F) of the lever arm. Press device according to at least one of the preceding claims, characterized in that the lever arms ( 110 ) are formed identically. Pressing device according to at least one of the preceding claims, characterized in that the pressing jaws ( 120 ) are formed identically. Pressing device according to at least one of the preceding claims, characterized in that the outer contour (U) of the lever arms ( 110 ) has the shape of a circular arc. Pressing device according to at least one of the preceding claims, characterized in that the pressing jaws ( 120 ) on the lever arms ( 110 ) over bridges ( 112 ) are stored, which engage in grooves. Pressing device according to at least one of the preceding claims, characterized in that the pressing jaws ( 120 ) captive on the lever arms ( 110 ) are stored. Pressing device according to at least one of the preceding claims, characterized in that the pressing jaws ( 120 ) Contact surfaces (K) over which they contact each other and can exert forces on each other. Pressing device according to at least one of the preceding claims, characterized in that the joint (G) a tab ( 140 ), which at their ends articulated with one lever arm ( 110 ) connected is.