DE2517808A1 - PIPE COUPLING, IN PARTICULAR SEALING ARRANGEMENT FOR SEALING COVERAGE OF THE ENDS OF PIPES - Google Patents

Description

Pipe coupling, in particular a sealing arrangement for bridging the ends of pipes in a sealing manner

The invention relates to pipe couplings or pipe connections and in particular to but not exclusively arrangements for connecting drainage pipes or waste pipes and the like. With the help of Connection or coupling can, for example, plastic pipes as clay pipes are also connected to one another.

The device according to the invention contrasts with an improvement Arrangements as they are discussed in US Pat. No. 3,479,066 and in other publications discussed in the aforementioned patent

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Telephone (089) 281202

Telegram: LJpatli Munich

Bavarian. Vereinebank Munich, account no. 882495

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Postal check Munich No. 163397-802

Scriptures are described. In U.S. Patent 3,479, cited above describes an arrangement in which the clamping bodies are rigid and made of cast iron. Mark rigid sprags Connections or couplings of a known type.

Clamping bodies are also known which are flexible or bendable are. Compared to such known arrangements, the present invention relates to improvements with regard to economical production and the ability of seals on couplings of pipe ends to tolerate the outside diameter of the pipes to a greater extent adapt.

The present invention is in a coupling or connecting arrangement realized, by means of which the ends of tubes can be connected to one another in fluid-tight relationship. The invention Coupling is suitable for connecting pipe ends that have either outer, annular end ribs, as flange or socket beads known, have or not. The coupling according to the invention ensures a strong, firm and effective connection arrangement between any pipe ends of the type mentioned. In addition, the coupling is suitable for a sealing connection between the end of a pipe with a socket bead and the end of another pipe which does not have a socket or flange bead. The coupling is applicable to pipes of uniform diameter or to pipe sections which are flared or beveled Own end parts. In particular, the arrangement according to the invention is suitable for use with waste or drainage pipes, however it is not limited to pipes of this type.

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In a preferred embodiment of the invention, the coupling Clamping body which clamp the ends of the pipes to be connected in the surrounding area. An annular seal body surrounds the ends of the pipes or pipe sections to be connected within the clamping device. The clamping device consists of essentially semicircular bodies with a narrow inner and annular groove in which the sealing body is located can deform. The sealing body is in turn provided with diametrically opposite lugs, which between End parts of the clamp bodies are clamped together to avoid dimensional changes in the clamp bodies and / or the pipe ends to compensate and to participate in the sealing of the connection. The end parts have radially extending attachment surfaces on. The sealing body is provided with inner, annular ribs including a central rib, which is between adjacent Ends of the pipe sections is inserted. In the same way, the sealing body has inner, annular ribs which pressed against the pipe surfaces. The seal body preferably also has outer annular ribs. Preferably is the sealing body is equipped with an outer, relatively wide rib made of the same material.

With the present invention, there has been a simplified and effective one Pipe coupling created which can be used universally. The pipe coupling or connection provides a strong and firm Connection arrangement, even where the pipe ends have no end beads or socket rings or flange extensions. In the connection is ensured in the same way where the tubes have such beads or in those cases in which a

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Tube has such a bead, while the other tube does not Owns bead.

The device according to the invention enables a compensation of Dimensional changes of the clamping body or the pipe ends, which with the help of the special shape of the clamping body and the Approaches to the sealing ring and the deformability of the clamping body is achieved.

The invention is embodied in a pipe coupling, which in particular suitable for connecting the ends of pipes which have or do not have annular end ribs or flange beads. The coupling or the connection according to the invention is provided with a sealing body into which the ends of the tubes are fitted. Deformable (semi-rigid) sprags surround the seal body and the ends of the pipe. These clamp bodies have narrow inner and annular recesses. The sealing body in turn is provided with diametrically opposed lugs or ears, which are clamped between matched end parts forming lugs on the clamping bodies. The seal body is also provided with a uniform material outer annular rib, which in the annular recesses of the clamping body fits. Pipes or pipe sections with flange beads can be received in the annular recesses of the clamping body. the Clamping bodies can deform when jammed (mutual screwing) to create a clamping pressure over the entire circumference exercise on the seal body.

The invention is described below using exemplary embodiments Explained with reference to the accompanying drawing.

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FIG. 1 is an isometric view of an arrangement according to FIG Invention;

Fig. 2 is an exploded view of the clamping body and the sealing body of the arrangement according to the invention;

Figure 3 is a sectional view of the seal body shown in Figures 1 and 2; and

Figures 4, 5 and 6 are sectional views of the coupling and the sealing body showing the coupling pipe ends, both of which are provided with flange beads, below Representation of the pipe ends with a bead formed on one pipe end and showing the pipe ends which neither have a bead.

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Referring to Figures 1 and 2 of the drawings, there is a preferred embodiment shown the pipe coupling according to the invention. The ends of the pipes or line sections are identified by the reference numerals 10 and 11 designated. The pipe sections have socket beads or socket rings at the ends, i.e. annular end ribs, as shown at 14 and 15 are shown in FIG. The pipe coupling or pipe connection according to the invention allows a rigid and effective Seal regardless of whether the pipes are facing outwards at their ends have directed annular end ribs or not. The pipe coupling has two semicircular clamping bodies 18 and 19 End portions that form flat, substantially radial surfaces 20, 21, 22 and 23. The clamping bodies 18 and 19 can by means of screws 26, 27 and nuts 28, 29 are connected to one another. The end parts of the clamping bodies are provided with openings for this purpose and are connected to one another by the screws in the manner described above.

Each of the clamp bodies 18 and 19 has a flat inner annular shape Recess, which is shown at 36 and 38.

The clamping bodies are not made of cast iron, but are preferably made of plastic. However, you can also choose from other materials. The inner shape of the clamping body can be seen from FIGS. 1 and 2 of the drawings.

The external shape of the clamping body is shown in FIGS. 1, 2 and 4-6 emerged. On the sides of the clamp body 18 are annular Ribs 40 and 42, while annular grooves 44 and 46 are located just inside these ribs. The end parts of the

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Coupling bodies form lugs, i.e. they are designed in such a way that they have larger dimensions in the radial direction. Fig. 4 shows a section of the clamp body 18. The end parts 20, 21, 22 and 23 are designed so that they accommodate the clamping screws and nuts and have the required strength. It's by reference It can be seen on the end part 21 that this has a greater radial extension at the ribs 40 and 42, i.e. the ribs 40 and 42 are equipped at its end with a larger radial dimension. The surfaces on the inside of the grooves 44 and 46 are at their ends increases and merges into ribs 52 and 54. The structure described above gives sufficient strength to the end portions of the To clamp the clamping body against the seal in the manner described below. The structure of the clamp body is sufficient Strength and flexibility are achieved with a minimum of cross-sectional thickness, so that the amount of material required can be reduced to a minimum.

The opening or hole for the screw 27 has a hexagonal Counterbore 63 for receiving the hexagonal screw head, so that this opposite rotation when tightening the nut is held. The structure is the same at the other end of the clamping body 18. The nut 29 rests against one with respect to the surface 23 opposite surface at the end of the clamping body 19.

When the plastic coupling shown, the clamping bodies on each other to be pulled or screwed, then only a torque of 0.52 mkp is required, while existing cast iron Couplings a torque of 1.52 mkp is required. If the coupling is made of plastic, the coupling

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halves are pulled together, then the clamp bodies bend, This can be felt by manually bending one of the clamps, the result is that the entire surface the clamping body bend or deform and thereby adapt to the shape of the sealing element on the entire arc of 360. This supports the seal with a lower torque. Of course, a cast iron coupling will not bend in the manner described above.

The coupling can be produced more easily and also more cheaply using the plastic injection molding process. The ones made of plastic Clamping bodies are strong enough to hold a sealing element against the ends of pipes made of cast iron, such as Clamping drainage or waste pipes. The clamp bodies are sufficiently flexible so that they can move in the manner described above Way bend and deform when with relatively little Torque are mutually screwed to clamp the sealing element and seal completely. Given As a result of these facts, smaller fastening bodies can be used compared to cast iron clamps.

The cross-section of each clamp body ensures the required Strength, while at the same time ensuring the desired flexibility or deformability. The ribs and annular grooves contribute to these properties.

A plastic known as ABS is preferably used as the plastic Material used. However, other plastics or plastic materials can also be used. the

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Thickness of the sprags, provided with ribs and annular grooves, is chosen so that with minimal use of material, suitable or sufficient strength and sufficient flexibility in a das Sealing element surrounding position is achieved. In this way there is an adequate sealing connection and protection of the inside the seal located parts guaranteed. The ABS material is Acrylonitrile butadiene styrene and polyvinyl chloride. It can, however most plastic materials, such as nylon, acrylic material, acetate material, Epoxy material, cellulose-based plastics, melamine, phenol, polyester, polystyrene can be used. The advantages of Plastics are as follows: 1) Desired malleability and conformability the clamping body on the sealing body and, as a result, better usability for sealing the connection; and 2) as a result of improved ductility, pipes with larger tolerances of the outside diameter can be sealed successfully.

Reference number 64 denotes a circular sealing body or a sealing element which is made of any suitable elastomer sealing material can consist of neoprene. The sealing body has a relatively thin cross-section. He has one material uniformly formed inner and running in the middle annular rib 65. It also has inner annular sealing ribs which are outside of the central sealing ribs Rib 65 are provided. Thus, ribs 66 and 67 are at one end of the seal body, while ribs 68 and 69 are located are at the opposite end. The sealing body also has a wider one that extends on the outer circumference and annular rib 70. In addition, the sealing body has outer annular sealing ribs 71 and 72, which are attached

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one end spaced from the rib 70, as well as outer annular ribs 73 and 74 at the other end of the seal body.

The seal body has diametrically opposed lugs 80 and 81. The lugs (end portions) or surfaces 20-23 become one with the other secured by wedging the sealing lugs 80 and 81 between them. The approaches of the sealing body can be fixed by the screws in the manner shown. the protruding lugs 80 and 81 have a concave shape on their outside. The end portions or lugs on the sprags 18 and 19 are designed accordingly on the inside or kept in the shape, i.e. that it is complementary to the outer shape the approaches 80 and 81 are made. If the sprags are screwed together or tightened facing each other, then the approaches are pressed together. In this way there is a compensation or recording for dimensional changes guaranteed at the pipe ends or on the clamps, while radial compression seals the connection. The bow or the The curvature of the complementary surfaces on the approaches and on the clamps is only shown by way of example. So can the radius the curvature be smaller than shown or larger. The outside shape can also run as a tangent line to the circumference of the sealing body. It is important that the clamp body ends go through the Approaches are kept at a distance, so that a sufficient jamming is possible to thereby diameter tolerances compensate for the pipe ends to be jammed. This is how the Klemmoder Clamping force on the screws primarily against the sealing ribs on the circumference (outer and inner ribs) the approaches exerted, the pressure being applied to the remaining

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Sealing surface is expanded or extends with respect to this. This property is favored by the ability of the clamp body to deform and be exactly opposite to the outer one Apply sealing body surface.

Fig. 1 shows the pipe coupling or pipe connection in the clamping position without significant screwing. The inner rib 65 on the seal body 64 fits between the adjacent ends of the tubes or pipe sections 10 and 11. The clamping bodies 18 and 19 are drawn together and firmly clamped so that they deform the sealing body 64 with respect to the outer surfaces of the pipe ends 10 and 11. As can be seen, the flange beads or outer annular ribs 14 and 15 (FIG. 4) cause the central part of the sealing body 64 is deformed inwardly in the direction of the annular recesses 36 and 38 in the clamping bodies 18 and 19 will. The outer parts of the clamp bodies 18 and 19 deform the Sealing body 64 opposite the outer surfaces, while the pipe ends or pipe sections 10 and 11, the sealing ribs 66-68 and 71-74 deform. This creates an effective, strong seal between the clamping device and the pipe ends, with this seal extends over a substantial part of the axial length of the pipe ends. For pipe ends with a larger diameter the existence of flange beads or rings has the consequence that the sealing body more strongly into the space available laterally the clamping body recesses is pressed. The one through the connection formed coupling is to be regarded as extremely safe and strong. Figs. 1 and 4-6 illustrate a condition before a stronger one The clamping body has been screwed together, i.e. the sealing body is shown in a position that has not yet been fully compressed.

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Fig. 4 is a sectional view of a portion of the coupling of Figs. and 2. This view illustrates the use of the invention on pipe ends which have both flange beads, i.e., end ribs according to reference numbers 14 and 15. The outer rib 70 fits into the Recesses 36-38 of the clamping body, as shown, with this part of the sealing body in the space between the clamping bodies and the pipe ends is pressed in. The seal is made by the inner and outer annular sealing ribs also mediated by the radial compression exerted on the lugs 80-81 by the sprags. Because of the location the annular rib 70 within the recesses the clamping body, the sealing body is held in its position and this avoids pipe ends with socket beads from being pulled off the coupling. Small gaps on the Sides of the recesses serve to accommodate sealing material that is sealed together.

The contact or contact pressure between the inside of the clamping body and the outer surface of the sealing body 70 changes depending on the pipe diameter, depending on the presence or absence of socket beads and depending the transmitted torque, etc. In either case, there is considerable contact in the recess, so that this area contributes significantly to the connection.

In Fig. 5 the use of the device according to the invention is shown at pipe ends 10 and 11, of which only one pipe end has an end rib or a socket or flange rib. The rib 70 is in the aforementioned manner in the ring recess

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36 fitted. The part of the sealing body opposite the bead 15 is compressed in the manner shown. The rib 70 serves to take or to fill the space between the clamping body 18 and the end of the tube 11 'on the other side of the inner rib 65.

Fig. 6 shows in sectional view the use of the inventive Coupling at pipe ends 10 * or 11 ', none of which has an end rib or a socket bead. As shown the rib 70 essentially occupies the space of the annular recess 36 in the clamping body. The space, which by socket beads or end ribs would be occupied is occupied by the sealing body itself.

The outer and inner annular ribs or projections serve to ensure the sealing of the coupling when the clamping bodies are drawn towards one another or be screwed. During this time, radial compression is also exerted on the lugs, resulting in a completion of the Sealing leads and adapting to different pipe outside diameters enables.

In the present connection according to the invention, deforms the sealing body 64 in the manner described. The seal is strong, effective and secure. The parts adapt to the differences of the individual parts to be connected. Connections of this type are suitable for those made of cast iron that have no lugs or flanges Pipeline installations and pipeline systems for sanitary purposes.

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From the above description it can be seen that the coupling according to the invention creates an effective seal and connection which is to be regarded as strong and firm. The coupling is extremely reliable in its adaptability when connecting pipe ends which have socket beads or not, or when connecting a pipe end with a flange bead with a pipe end without such a flange bead. From
Plastic coupling or connection arrangement is advantageously suitable when enclosing a pipe

knife over a range of 360, with tubes with another Range of diameter tolerances can be included as previously usual.

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Claims (9)

PATENT CLAIMS Γ 1 .1 pipe coupling, in particular sealing arrangement for sealing bridging of the ends of pipes or lines, with adaptation to pipes, which have outer annular end ribs or not, with a device that encompasses the pipe ends and mutually clamped, which is formed from mutually clampable clamping bodies, and with a sealing device which is located between the clamping device and the pipe ends and can be clamped by the clamping bodies against the pipe ends and bridges the pipe ends, characterized in that the clamping device formed from clamping bodies (18, 19) has sufficient flexibility to be able to withstand deformation on a circumference of substantially 360 ° to exert an inward clamping force against the sealing device (64) in such a way that the pipe coupling can accommodate pipe diameters with larger deviations from the tolerances. 2. Pipe coupling according to claim 1, characterized in that the sealing device (64) is directed diametrically outward has radial lugs (80, 81), and that the clamping bodies have end parts (21, 23), which are located between them ■ Jamming approaches and are held by this at a mutual distance. - 16 - 609816/0249 3. Pipe coupling according to claim 1, characterized in that each of the clamping bodies (18, 19) has annular ribs (40, 42) and grooves (44, 46) for the purpose of required strength and nevertheless has sufficient flexibility to be deformed in the event of mutual tension relative to the sealing device (64). 4. Pipe coupling according to claim 2, characterized in that the clamping body in the region of the end parts (20, 21, 22, 23) through Ribs are reinforced which extend between the circular part of the clamp bodies and the end parts. 5. Pipe coupling according to claim 1, characterized in that the clamping bodies each have a flat inner annular recess have, and that the sealing device has an outer rib (70) which fits into the recesses of the clamping body can be used to accommodate pipes with or without flange beads. 6. Pipe coupling according to claim 1, characterized in that the sealing body has an inner annular end rib (66, 67j 68, 69) near its ends, as a result of which the ends of the sealing body, when tensioned, are sealed against the pipe ends (10, 11). 7. Pipe coupling according to claim 2, characterized in that the lugs on the sealing body in their outer shape as radial increasing expansion of the sealing body outer surface are formed, and that the clamping bodies are complementary at the ends are shaped so that by sealing the seal body and - 17 - 6098 1 6/0249 of the lugs inwardly directed forces are exerted on the sealing body in such a way that dimensional changes in the pipe ends and the clamping device are accommodated. 8. Pipe coupling according to claim 6, characterized in that the sealing body has outer end ribs (71, 72j 73, 74) in the inner one having annular end ribs opposite position. 9. Pipe coupling according to claim 1, characterized in that the clamping bodies are made of plastic of sufficient strength, which are designed so that they are mutually with sufficient force are braced in order to clamp and seal the sealing body, the clamping body corresponding to the clamping forces bend and exert substantially 360 inward compressive forces. 609816/0249 Blank page