GB1574298A - Pipe connectors - Google Patents
Pipe connectors Download PDFInfo
- Publication number
- GB1574298A GB1574298A GB12416/78A GB1241678A GB1574298A GB 1574298 A GB1574298 A GB 1574298A GB 12416/78 A GB12416/78 A GB 12416/78A GB 1241678 A GB1241678 A GB 1241678A GB 1574298 A GB1574298 A GB 1574298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- locking ring
- spigot
- sealing
- housing groove
- lip
- 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
Links
- 238000007789 sealing Methods 0.000 claims description 74
- 230000006835 compression Effects 0.000 claims description 24
- 238000007906 compression Methods 0.000 claims description 24
- 238000003780 insertion Methods 0.000 claims description 21
- 230000037431 insertion Effects 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- OYFJQPXVCSSHAI-QFPUQLAESA-N enalapril maleate Chemical compound OC(=O)\C=C/C(O)=O.C([C@@H](C(=O)OCC)N[C@@H](C)C(=O)N1[C@@H](CCC1)C(O)=O)CC1=CC=CC=C1 OYFJQPXVCSSHAI-QFPUQLAESA-N 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002226 simultaneous effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
- F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
- F16L47/10—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket the sealing rings being maintained in place by additional means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L17/00—Joints with packing adapted to sealing by fluid pressure
- F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
- F16L17/025—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket the sealing rings having radially directed ribs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
- F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Joints With Sleeves (AREA)
Description
(54) IMPROVEMENTS IN PIPE CONNECTORS (71) We, DIPL. -ING. DR. ERNST
VOGELSANG GmbH & CO. KG of Industriestrasse 2, 4352 Herten, Federal Republic of Germany, a Germany Company, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to pipe connectors of the type comprising a socket and a sealing member, the socket incorporating axially spaced cylindrical portions for guiding an inserted spigot, an enlargement between the guide portions and consisting of a housing groove for a locking ring on the sealing member, made of rubber or a plastics material, and a sealing chamber for a sealing lip on the sealing member and integral with the locking ring. Such a pipe connector will hereinafter be referred to as "of the type defined". The socket, and an inserted spigot, can consist of a synthetic thermoplastics material such as PVC or hard-PVC, or of metal. They can be separate components attached. by for example welding, to a length of pipe requiring a connector. Alternatively. they can be components formed integrally with a length of pipe, which will normally consist of a synthetic plastics material. The major applications are for cable protection and water distribution. Accordingly, the requirements include guaranteed sealing action against both internally and externally applied pressure together with easv assemblv.
In a known pipe connector of the type defined, the locking ring is provided with a separate stiffening ring which is inserted in a specially formed groove near the midsection of the locking ring and consists of a hard synthetic plastics material. Clearance is left between the locking and stiffening rings and an inserted spigot. The purpose of the stiffening ring is to hold the locking ring in the housing groove and prevent unwanted displacement when the spigot is driven into the socket, thereby urging the sealing lip backwards into the sealing chamber. It also provides protection against dynamic loads during pipelaying, caused by buckling for example. Nevertheless, the intended purpose is never fully achieved, however rigid the stiffening ring is made. The locking ring invariably moves askew and the sealing lip becomes misaligned in the sealing chamber, so that the risk of leaks must always be anticipated. This rick becomes particularly high when dirt is carried into the pipe connector on an inserted spigot and becomes lodged between the sealing member and the socket or, as often happens, between the sealing lip and the walls of the sealing chamber. Moreover, skew misalignment as previously referred to often arises when it is impossible to avoid carrying dirt into the pipe connector on a spigot. The known pipe connector in question has been used in a very wide variety of communication pipework, but it can be and has already been used in cable protection pipework. Special problems arise in this application, and they constitute the focal point of this invention
In the first place, the joints in cable protection pipework must be extremely leakproof, in order to prevent "cable drenching" by penetrating water. In the second place, leaks are never directly observable (as they are in pipelines carrying a medium under pressure. which will escape at any unsound joint). Moreover, substantial stresses are set up during the laying of pipelines fitted with such pipe connectors. They include in particular the dynamic loads already referred to, which are set up when cable protection pipes fitted with such pipe connectors are buckled during laying or in transport. The investigations from which this invention transpires have shown that when the pipe connectors in question are subjected to such stresses the locking ring may remain aligned in the housing groove but nevertheless undergo a displacement.
Once a locking ring has been displaced, it cannot spontaneously return to its correct position in the housing groove, with the result that the joint becomes leaky. The same problem is encountered with a proposed modified pipe connector not previously used in the art, in which the locking ring and the housing groove are trapezoidal in crosssection.
The object of the invention is to provide a pipe connector of the type defined, intended and adapted for use in cable protection pipework and capable of withstanding the pipelaying stresses, and wherein if the stresses displace the locking ring it will spontaneously return to its correct position, during if not before the jointing process, i.e., when a spigot is driven into the socket.
According to the present invention, in a pipe connector of the type defined, the locking ring has an internal circumferential compression rib, provided with a chamfer extending substantially to the adjacent end of the guide portion adjacent the entry of the socket, the locking ring being adapted to be urged by means of an inserted spigot acting through the compression rib into the housing groove, which is identical in crosssection with the locking ring and the sealing lip, which before insertion of a spigot converges generally in the direction of insertion, having closure lip which diverges from the sealing lip and which, before insertion of a spigot, reaches the inner wall of the sealing chamber.
The first effect attained by the invention is self-alignment of the locking ring in the housing groove, since elastic strains in the locking ring produce corresponding counterforces. To these are added an active restoring effect as an inserted spigot is driven in. from the action of the compression rib. which is compressed by the spigot
and sets up a corresponding moment. To this end. one preferred embodiment of the
invention has the compression rib located,
in the direction of insertion, beyond the
centre of gravity of the cross-sections of the
housing groove and the locking ring. All
these provisions ensure that the locking ring
will return to its correct position, essential
for the sealing action, after displacement in
the direction of insertion by pipelaying
stresses. and will lock back in position. At
the same time, restoration in position is also
ensured after displacement in the opposite
direction. In this case. the sealing lip is held
in the sealing chamber and undergoes an
elastic deformation which once again sets up
a restoring moment. Another simultaneous
effect is that dirt can no longer enter
between the sealing lip and the inside wall of the sealing chamber. All these effects are ensured, whether the end of an inserted spigot is square or bevelled to a fine edge.
Moreover, the effects are not lost when a spigot carries dirt, which cannot be prevented in any case. The dirt is wiped off by the compression rib, and retained in a dirt chamber which spontaneously forms ahead of the compression rib. The elastic adjustment of the sealing component is basically open to choice. It depends on the diameter of the cable protection or water distribution pipe required. In one particularly successful embodiment the sealing member is made from a rubber having a Shore hardness of 45". However, the Shore hardness for largediameter pipe connectors can be 55" or even higher.
In one preferred embodiment of the invention, giving outstandingly high sealing efficiency the sealing lip is formed with a tongue-and-groove profiling, as might be used in a labyrinth seal, and which comes into sealing effect by pressing the formed profile to the outer wall of an inserted spigot on the one hand and to the inner wall of the sealing chamber on the other hand. In the case of pipe connectors of unusually large nominal diameter, it can be useful to supplement the features already described by providing a ring of spring steel embedded, and for example vulcanized inside the
Icoking ring of the sealing component. In the particular circumstances when it must be ensured that the locking ring will take up its position in the housing groove securely and without going askew, even if a spigot is driven relatively rapidly into the socket, it is preferred under the invention to adopt a trapezoidal cross-section for the housing groove and correspondingly for the locking ring. In this connection. one preferred embodiment of the invention has the flanks of the trapezoidal cross-section at an angle of substantially 30 to the radial direction.
According to a further preferred feature of the invention, the angle of the chamfer on the compression rib and the angle of an associated external chamfer on an inserted spigot used together with the pipe connector are specifically selected so that the two angles lie outside the self-locking range when the spigot is inserted into the socket.
An embodiment of the invention will now be described. by way of example only, with reference to the accompanying drawings. in which:
Figure 1 is a longitudinal section through
a pipe connector of the invention; and
Figure 2 is a view on a larger scale of parts indicated by arrow A in Figure 1.
The embodiment of pipe connector in
accordance with the invention is shown in
the top half of Figure 1, in the state before jointing, and in the bottom half of Figure 1 in the state after jointing, i.e., after insertion of the spigot. The pipe connector shown is particularly intended for use in cable protection pipework. It consists of a socket 1 and a sealing member 2. The socket 1 incorporates axially cylindrical portions of which one 3 is adjacent the entry and the other is spaced therefrom by an enlargement the two steps 5, 6 of which consist of respectively a housing groove 5 for a locking ring 7 on the sealing member, which is made of rubber or a plastics material, and a sealing chamber 6 for sealing lip 8 on the sealing member and integral with the locking ring 7. An oblique shoulder 9 connects the two parts of the broadening 5, 6. The housing groove 5 and the locking ring 7 are trapezoidal in cross-section.
The locking ring 7 has an internal circumferential compression rib 10, provided with a chamber 11 extending substantially to the adjacent end of the guide portion 3. The inner diameter of the locking ring 7 in this region exceeds the inner diameter in the guide portion 3 of the socket and the outer diameter of an inserted spigot 15. Moreover, the arrangement is such that the locking ring 7 is urged, by means of the spigor 15 causing compression and deformation of the compression rib 10, into the housing groove 5 and consequently undergoes positive location in the housing groove 5 as the spigot 15 is driven in. To this end. the compression rib 10 in the embodiment shown is located, in the direction of insertion of the sigot 15, beyond the centre of gravity KR of the trapezoidal cross-section of the housing groove 5 and the locking ring 7.
The top half of Figure 1. and more particularly Figure 2, show that the sealing lip 8. which before the jointing process converges generally in the direction of insertion. has a closure lip 8a which diverges
closure lip 8a which from the sealing lip 8 and. before the jointing process reaches the inner wall of the sealing chamber 6. Consequently, the air space between the sealing lip and the inner wall of the sealing chamber, before the jointing process, is closed against the entry of loose soil particles. Furthermore, the sealing lip 8 is formed with a tongueand-groove profiling 12 the sealing effect of which comes into being when the spigot 15 is driven fullv home. and is formed by pressing the said profiling 12 to the outer wall of the spigot 15 on the one hand and to the inner wall of the sealing chamber 6 on the other hand. As indicated in the lower part of
Figure 1. the locking ring 7 can contain a ring 13 of spring steel or hardened synthetic plastics material which may be vulcanised to as well as embedded in the locking ring 7.
The angle of the chamfer 11 on the compression rib 10 of the locking ring 7 and the angle of an associated chamber 14 on the spigot 15 are arranged so that they lie outside the self-locking range when the spigot 15 is inserted in the socket 1. It is particularly significant that the trapezoidal cross-sections of the housing groove 5 and the locking ring 7 include flank faces 5a and 7a respectively, at an angle as indicated of substantially 30 to the radial direction R, the flank face 5a being longer than the flank face 7a. This avoids the risk of displacement during the insertion of the spigot 15, by direct impact between the spigot 15 and the locking ring 7 after passing beyond the guide portion 3. The spigot 15 may be secured permanently by adhesive bonding in the region of the guide portions 3 and 4.
The ring 13 ensures that the closure lip 8a takes up an exactly prescribed position before the jointing process.
WHAT WE CLAIM IS:
1. A pipe connector comprising a socket and a sealing member, the socket incorporating axially spaced cylindrical portions for guiding an inserted spigot, an enlargement between the guide portions and consisting of a housing groove for a locking ring on the sealing member, made of rubber or a plastics material, and a sealing chamber for a sealing lip on the sealing member and integral with the locking ring, which has an internal circumferential compression rib provided with a chamfer extending substantially to the adjacent end of the guide portion adjacent the entry of the socket, the locking ring being adapted to be urged by means of an inserted spigot acting through the compression rib into the housing groove, which is identical in cross-section with the locking ring, and the sealing lip, which before insertion of a spigot converges generally in the direction of insertion, having a closure lip which diverges from the sealing lip and which, before insertion of a spigot, reaches the inner wall of the sealing chamber.
2. A pipe connector as in Claim 1, wherein the compression rib has an internal peak located, in the direction of insertion, beyond the centre of gravity of the crosssections of the housing groove and the locking ring.
3. A pipe connector as in Claim 1, wherein the sealing lip is formed with a tongue-and-groove profiling for forming a seal when the profile is pressed to the outer wall of an inserted spigot on the one hand and to the inner wall of the sealing chamber on the other hand.
4. A pipe connector as in any one of
Claims 1 to 3, wherein the housing groove and the locking ring are of trapezoidal cross-section, which incorporates flank faces at an angle of substantially 30 to the radial direction.
5. A pipe connector as in any one of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A pipe connector comprising a socket and a sealing member, the socket incorporating axially spaced cylindrical portions for guiding an inserted spigot, an enlargement between the guide portions and consisting of a housing groove for a locking ring on the sealing member, made of rubber or a plastics material, and a sealing chamber for a sealing lip on the sealing member and integral with the locking ring, which has an internal circumferential compression rib provided with a chamfer extending substantially to the adjacent end of the guide portion adjacent the entry of the socket, the locking ring being adapted to be urged by means of an inserted spigot acting through the compression rib into the housing groove, which is identical in cross-section with the locking ring, and the sealing lip, which before insertion of a spigot converges generally in the direction of insertion, having a closure lip which diverges from the sealing lip and which, before insertion of a spigot, reaches the inner wall of the sealing chamber.
2. A pipe connector as in Claim 1, wherein the compression rib has an internal peak located, in the direction of insertion, beyond the centre of gravity of the crosssections of the housing groove and the locking ring.
3. A pipe connector as in Claim 1, wherein the sealing lip is formed with a tongue-and-groove profiling for forming a seal when the profile is pressed to the outer wall of an inserted spigot on the one hand and to the inner wall of the sealing chamber on the other hand.
4. A pipe connector as in any one of
Claims 1 to 3, wherein the housing groove and the locking ring are of trapezoidal cross-section, which incorporates flank faces at an angle of substantially 30 to the radial direction.
5. A pipe connector as in any one of
Claims 1 to 4, together with an inserted spigot, wherein the angle of the chamfer on the compression rib and the angle of an associated chamfer on the inserted spigot lie ouside the selflocking range.
6. A pipe connector as in any one of
Claims 1 to 4 and substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19777710752 DE7710752U1 (en) | 1977-04-05 | 1977-04-05 | PIPE CONNECTOR |
| DE19777713734 DE7713734U1 (en) | 1977-04-30 | 1977-04-30 | Pipe connector for cable protection pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1574298A true GB1574298A (en) | 1980-09-03 |
Family
ID=25947990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12416/78A Expired GB1574298A (en) | 1977-04-05 | 1978-03-30 | Pipe connectors |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT366210B (en) |
| FR (1) | FR2386766B1 (en) |
| GB (1) | GB1574298A (en) |
| IT (1) | IT1093979B (en) |
| NL (1) | NL183845C (en) |
| SE (1) | SE7803707L (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0283729A1 (en) * | 1987-03-18 | 1988-09-28 | Dipl.-Ing. Dr. Ernst Vogelsang GmbH & Co. KG | Pipe connector for plastic pipes made of a thermoplastic material, especially for cable ducts and pressure pipes |
| GB2218166A (en) * | 1988-04-20 | 1989-11-08 | Victaulic Plc | Jacking pipe seals |
| AU627018B2 (en) * | 1988-10-11 | 1992-08-13 | Dietzel Gesellschaft M.B.H. | Pipe coupling |
| WO2015185839A1 (en) * | 2014-06-06 | 2015-12-10 | Vianney Rabhi | High-pressure rotary seal-plug assembly with expandable continuous ring |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2717487C3 (en) * | 1977-04-20 | 1979-10-11 | Wavin B.V., Zwolle (Niederlande) | Extruded plastic pipe part with molded socket |
| FR2528534B1 (en) * | 1982-06-14 | 1986-05-02 | Polva Nederland Bv | FITTING FOR THERMOPLASTIC PIPES |
| FR2619194B2 (en) * | 1986-12-26 | 1989-12-08 | Tuyaux Bonna | INTEGRATED JOINT FOR PIPES, ESPECIALLY SANITATION |
| DE3705683A1 (en) * | 1987-03-23 | 1988-10-06 | Thyssen Polymer Gmbh | Sealing ring, preferably for cable pipes or the like |
| AT392146B (en) * | 1988-10-11 | 1991-01-25 | Dietzel Gmbh | SEALING RING |
| IT220623Z2 (en) * | 1990-11-19 | 1993-10-06 | Gewiss | MULTI-PURPOSE SLEEVE, IN FLEXIBLE MATERIAL, PARTICULARLY SUITABLE FOR THE JOINT OF PIPES, FOR THE PROTECTION OF ELECTRIC, TELEPHONE AND SIMILAR CABLES. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1123852A (en) * | 1967-01-13 | 1968-08-14 | Hepworth Iron Co Ltd | Improvements in or relating to pipe couplings |
| US3856315A (en) * | 1973-01-02 | 1974-12-24 | P Stansbury | Bell and spigot pvc pipe joint |
| IE40629B1 (en) * | 1974-11-27 | 1979-07-18 | Wavin Pipes Ltd | Pipe connections |
-
1978
- 1978-03-16 AT AT0188478A patent/AT366210B/en not_active IP Right Cessation
- 1978-03-29 IT IT21707/78A patent/IT1093979B/en active
- 1978-03-30 GB GB12416/78A patent/GB1574298A/en not_active Expired
- 1978-03-31 FR FR7809477A patent/FR2386766B1/en not_active Expired
- 1978-04-03 SE SE7803707A patent/SE7803707L/en unknown
- 1978-04-03 NL NLAANVRAGE7803553,A patent/NL183845C/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0283729A1 (en) * | 1987-03-18 | 1988-09-28 | Dipl.-Ing. Dr. Ernst Vogelsang GmbH & Co. KG | Pipe connector for plastic pipes made of a thermoplastic material, especially for cable ducts and pressure pipes |
| GB2218166A (en) * | 1988-04-20 | 1989-11-08 | Victaulic Plc | Jacking pipe seals |
| GB2218166B (en) * | 1988-04-20 | 1992-03-18 | Victaulic Plc | Jacking pipe seals |
| AU627018B2 (en) * | 1988-10-11 | 1992-08-13 | Dietzel Gesellschaft M.B.H. | Pipe coupling |
| WO2015185839A1 (en) * | 2014-06-06 | 2015-12-10 | Vianney Rabhi | High-pressure rotary seal-plug assembly with expandable continuous ring |
| FR3022005A1 (en) * | 2014-06-06 | 2015-12-11 | Vianney Rabhi | HIGH-PRESSURE ROTATING SEAL CONNECTION WITH EXTENSIBLE CONTINUOUS RING |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2386766A1 (en) | 1978-11-03 |
| AT366210B (en) | 1982-03-25 |
| IT1093979B (en) | 1985-07-26 |
| SE7803707L (en) | 1978-10-06 |
| NL183845B (en) | 1988-09-01 |
| ATA188478A (en) | 1981-07-15 |
| FR2386766B1 (en) | 1985-06-21 |
| NL183845C (en) | 1989-02-01 |
| NL7803553A (en) | 1978-10-09 |
| IT7821707A0 (en) | 1978-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960330 |