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
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
  • F16L37/10—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part
  • F16L37/113—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part the male part having lugs on its periphery penetrating into the corresponding slots provided in the female part
• • 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
  • F16L21/00—Joints with sleeve or socket
  • F16L21/08—Joints with sleeve or socket with additional locking 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
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
  • F16L37/10—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part
  • F16L37/107—Bayonet-type couplings
• • 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
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
  • F16L37/244—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe
  • F16L37/252—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe the male part having lugs on its periphery penetrating in the corresponding slots provided in the female part

Definitions

• the present invention relates to a pipe joint of the insertion socket type, i.e. where one of the pipes is preshaped with a widened socket portion which can receive a smooth end portion of the other pipe, op ⁇ tionally a resulting end portion after a shortcutting of this other pipe in situ. It is a reasonably simple prob ⁇ lem to provide a sealing between such pipe ends, as in the preshaped socket there may be mounted a sealing ring for radial sealing against the inserted smooth pipe end. What is more problematic is that while such an insertion joint may well be tight under ambient pressure condi ⁇ tions both outside and inside the pipes, an internal overpressure may give rise to axial forces seeking to separate the pipe joint.
• this simple type of pipe joint is not used, but replaced by more expensive joints, either welding joints or joints requiring working of thick walled pipes or join ⁇ ing elements, e.g. cutting or threading.
• the invention concentrates specifically on thin walled pipes, primarily pipes made of stainless steel plate material. Pipes of this type are used increasingly in drainage systems, in which it will normally be suf ⁇ ficient to use pure insertion joints, which should not resist noticeable axial forces. It has been found, how ⁇ ever, that even in this field there may be installations in which an overpressure has to be anticipated, such that it will be highly desirable that the insertion joints between the applied thin walled pipes are secured against separation by occurring axial separation forces. Apart from quite elementary and expensive possibi ⁇ lities for fixed joints between the ends of thin plate pipes, viz.
• this ring may form a projecting flange member that is suited for axial coupl ⁇ ing with a corresponding ring flange member placed on the other, socket carrying pipe, axially supported by the widening forming the socket.
• the deformations to be worked out on the smooth pipe end will not need to be continuously annular, as it may be sufficient that they are provided as a limited number of discrete exterior bulgings, which, in connection with thin walled pipes, are easy to produce by means of a suitable hand tool in such a manner that the pipe wall is not perforated.
• the bulgings may be round beads, but for higher forces it is advantageous to provide bulgings of an oblong shape seen in the peripheral direction; by way of example, a peripheral extension of 5-10 mm per bulging may be sufficient, e.g. with a total bulging length of 10-20 percent of the circumference.
• the added ring flange should be located spaced so far from the free pipe end that the latter may be brought into a safe radial sealing engage ⁇ ment with the sealing ring in the socket portion of the other pipe, and then the joint may be locked against axial separation solely by the projecting flange por ⁇ tions at the meeting pipe ends being interconnected in a drawproof manner.
• This may be done by means of longi ⁇ tudinal flange bolts between outwardly projecting, axially widely separated flange portions, but in prac ⁇ tice it will be preferable to use flange portions lo ⁇ cated relatively close to each other, this being pos- sible with the use of cup shaped flanges. In that case it will even be possible to join the flanges particular ⁇ ly easily, viz. by a bayonet locking.
• a bolt or bayonet con ⁇ nection between the flanges will not prevent a free mutual turning between the joined pipes, as both of the flange members or at least one of them may be held free ⁇ ly rotatably on the respective pipe.
• the flanges should only serve to secure the joint against axial separation, and the joining work will be facilitated in that it is not required to establish a holding between the deforma ⁇ tions on the smooth pipe end and the flange member sup ⁇ ported thereby. It will not either be required to work out an axial tightening together of the pipe ends, as the radial sealing will be fully sufficient, and for this reason a bayonet coupling can be fully satisfac ⁇ tory.
• the drawproof connection between the pipe ends be established by means of muff shells, which are inserted laterally over the joint from opposite sides in a manner such that inwardly protruding edge flanges at the free muff ends become located behind the respective widenings on the pipe end portions, these shells being held together by means of an exterior tightening strap or an outer, short locking tube.
• branch pipes that is short pipes branched off from the side of a main pipe, e.g. a downlet pipe, and terminated in a widened socket por ⁇ tion; for this type of pipes there is no possibility of mounting a flange member by axial insertion.
• Fig. 1 is a perspective view of a pair of pipe ends to be joined in accordance with the invention
• Fig. 2 is a longitudinal sectional view of the joined pipe ends
• Figs. 3-5 are corresponding sectional views of other embodiments of the joint
• fig. 6 is a perspective fractional view illustrat ⁇ ing a preferred embodiment of the invention
• Fig. 7 is a longitudinal sectional view thereof
• Fig. 8 is a side view, partly in section, of another embodiment of the invention.
• Fig. 9 is a longitudinal sectional view of still a further embodiment
• Fig. 10 is a sectional view of a modified flange mounting on a pipe socket portion
• Fig. 11 is a perspective exploded view of an impor ⁇ tant embodiment of the invention.
• Fig. 12 a sectional view thereof, when assembled.
• Fig. 1 shows two fully conventional thin sheet pipes 2 and 4, of which the pipe 2 has an originally smooth pipe end 6, while the counter end of the pipe 4 is preshaped with a socket widening 8 and with a local widening 10 thereon for holding an interior sealing ring 12, v/hich, by insertion of the pipe end 6 into the socket 8, provides for full sealing between these parts.
• the problem is only to prevent the thus con ⁇ ventionally insertion joined pipe ends from being se ⁇ parated axially by an occurring internal overpressure in the pipe system.
• the smooth pipe end 6 may be provided with a slightly crimped edge worked out either in the factory or in situ, such that the pipe end is particularly easy to insert into the sealing socket 8, but the pipe end 6 may also be unworked after simple cutting; also in that case it will be possible to insert the pipe end into the sealing socket of the pipe 4.
• a flange member 18 having a foremost, exterior flange 20 and a rearmost, interior flange 22, the latter extending to near the surface of the socket portion 8.
• this flange member may be displaced forwardly until the flange 22 abuts the rear side of the widening 10 on the portion 8.
• the two flange parts 14 and 20 may be brought to abut each other. It will be under ⁇ stood that thereafter these parts may be bolted to ⁇ gether, when they are provided with the required holes, and thereafter the joint will be locked against separa ⁇ tion.
• flange 20 is provided with fixed, forwardly projecting locking pins 24 adapted for cooperation with keyhole-like locking holes 26 in the flange element 14, as it is hereby possible to establish a bayonet locking between the flanges by a short mutual rotation of these.
• the flange element 14 is shaped with a C-profile, the inner free edge of which will abut the deformations 16 with a good holding ef ⁇ fect.
• these deformations are shaped such that their flanks facing the flange 14 are rela ⁇ tively steeply projecting, likewise for securing a good holding engagement.
• the pipe end 6 will be free to be displaced some ⁇ what further into the socket 8, and it will also be freely rotatable. Normally, there will be no hard axial engagement between the deformations 16 and the flange element, unless there is an overpressure in the pipe system.
• the flange parts are designed with a short axial extension and are bolted together by long connector bolts 28.
• Fig. 4 they are coupled together directly, by means of short bolts.
• the pipe end 6 has been worked by providing an exterior groove 30, in which there is in ⁇ serted an outwardly projecting locking ring 32 forming an abutment for the outer flange element 14.
• the working may be effected invertedly, i.e. by rolling up an an ⁇ nular, outwardly projecting rib, which may then serve the same purpose.
• the embodiment shown in Fig. 4 could also be an example of an insertion join between plastic pipes, in which the groove 30 could be formed as a low cutting or by a heat deformation.
• the flange parts are made of plastics and in such a manner that in being pushed together they will overlap each other in a snap locking area 34 as shown.
• Such a joint can be arranged so that it is practically impossible to release, unless it is cut into pieces; however, many pipings are laid in the ground and expected to have a long lifetime without being touched, so the joints should not necessarily be adapted for any easy separation.
• a particular bayonet locking based on the use of the sheet material itself.
• One of the flange portions is provided with projecting, slightly outwardly bent tongue members 36 which are introduceable into L-shaped locking tracks 38 in the end area of the other flange part, and also the material portion 40 forming the outer limitation of the L-track is slightly outwardly bent.
• a safe rota ⁇ tion stop is provided between the otherwise parallel sheet parts, which will also hereby be anchored against axial separation.
• This anchoring effect may be improved e.g. by providing for an outwardly bent end portion on the tongue members 36.
• the flange part on the smooth pipe end 6 is secured to the pipe by gluing, such that the pipe end itself will not have to be worked.
• the flange element 14 on this pipe end may have a cylindrical, optionally slotted portion 44, which, e.g. by means of a surrounding tightening ring, can be pressed against the surface of the pipe 6 for providing a strong and very durable gluing with the use of modern glue materials.
• the pipe 6 cannot be rotated relative the flange element 14, but the pipes can still be mutually rotated, because the opposite flange part 20 is rotatable rela ⁇ tive to the pipe 4.
• Fig. 9 illustrates the modification that the defor ⁇ mations 16 on the pipe end 6 are worked out in conjunc ⁇ tion with quite similar deformations in an inner, cylin ⁇ drical flange portion 46 of the flange element 14, whereby the latter will be totally locked to the pipe 6, though still by a simple craftsmanlike operation without any use of welding.
• Fig. 10 it is shown that the flange 20 on the pipe 4 may be prewelded to the outer end of of the socket portion 8; the flange 20 shown here is adapted for use with the flange 14 according to Fig. 1.
• a spanner strap can be laid around these parts, but a preferred solution is to introduce a pipe length E over the joined halves.
• This pipe should be locked against axial sliding off, and that is easily achievable by using a pipe length prepared with a pair of diametrical ⁇ ly opposite, inwardly protruding beads or bent tongue portions F, which may be introduced into bayonet locking tracks G in the respective muff halves A and B.
• the pipes may have outwardly projecting parts, secured by gluing, for cooperation with the muff pipe; such parts may also be spring members for snap locking the single muff halves in their mounted posi ⁇ tions.
• the muff halves may be hinged together along a common edge, whereby they can be folded together about the pipes, and instead of surrounding locking ring means it is then possible to use coupling parts at the respec ⁇ tive opposed, free edges of the muff halves.
• the muff halves A and B can be re ⁇ placed by corresponding parts having a similar length profile for forming monolateral holding bridges between the considered pipe portions 16 and 8,10.
• These holding bridges should not necessarily be coherent in the peri ⁇ pheral direction, but it will be appreciated that they can hardly be designed to be more simple than when made of a pair of pipe shells.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Flanged Joints, Insulating Joints, And Other Joints (AREA)
• Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26063375

Family Applications (1)

Country Status (5)

Families Citing this family (10)

Family Cites Families (4)

• 1992
  • 1992-07-22 EP EP92916500A patent/EP0606224A1/de not_active Withdrawn
  • 1992-07-22 AU AU23864/92A patent/AU2386492A/en not_active Abandoned
  • 1992-07-22 WO PCT/DK1992/000229 patent/WO1993002313A1/en not_active Application Discontinuation
• 1994
  • 1994-01-20 NO NO940211A patent/NO940211L/no unknown
  • 1994-01-21 FI FI940295A patent/FI940295A/fi not_active Application Discontinuation

Non-Patent Citations (1)

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