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
  • 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
  • F16L17/03—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 having annular axial lips
  • F16L17/035—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 having annular axial lips the sealing rings having two lips parallel to each other
• • 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
  • F16L17/03—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 having annular axial lips
  • F16L17/032—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 having annular axial lips the sealing rings having only one lip

Definitions

• FIG. 2 is a half end view of the connection pipe in FIG. 1,
• FIG. 3 is a half axial sectional view of a second embodiment of the connection pipe having a socket portion and a sealing ring.
• connection pipe shown in FIGS. 1 and 2 is intended to be made by rotational molding of a suitable plastic material such as polyethylene and comprises a socket portion 10 to receive therein a joining insert pipe.
• the socket portion terminates at a widened portion 11 having an outside thread, and inwardly of this widened portion there is a flat annular end surface 12.
• a closing web is formed at the end of the socket portion, but in such web an opening 13 is provided by milling.
• the outside curved surface of the product and thus also the socket portion 10 and the widened portion 11 having an outside thread, as well as said web and thus also the remaining annular end surface 12 are shaped at the rotational molding against accurately machined surfaces in a cavity of the mold and, therefore, the desired shape can be imparted thereto within close tolerances;
• the inside curved surface of the tubular product is not defined by the mold.
• An inside annular groove for a resilient sealing ring in the socket portion thus cannot be provided with a material accuracy as far as the shape and size thereof are concerned, as was mentioned above.
• connection pipe made by rotational molding is combined with an injection molded screw ring 14 of a suitable plastic material such as
• This screw ring is mounted by an inside thread on the widened portion 11 having an outside thread, and has a portion 15 which is located inside the widened portion and by the screw ring being tightened can be engaged with the annular end surface 12.
• the screw ring 14 has an annular flange 16 projecting inwardly which terminates at a hook-shaped edge portion 17 and which defines at the lower side thereof together with the inner side of the portion 15 and the annular end surface 12 an annular undercut groove for receiving a resilient sealing ring 18 such as a rubber ring, having an inside sealing lip 19 to engage sealingly the outside surface of a joining insert pipe inserted into the socket.
• This annular groove can be given close tolerances, because the screw ring has such surfaces only as are defined by the mold and because the annular end surface 12 also is a surface defined by the mold.
• the ring 14 can be pressed onto the widened portion 11, a positive engagement being provided between the ring and the widened portion by interengaging ridges and grooves on these elements.
• connection pipe made by rotational molding is indicated at 10' and terminates at a widened portion 11' in the end surface of which an annular groove 24 having bounding surfaces defined by 'the mold, the bottom surface thereof being indicated at 12'.
• the injection molded ring is indicated at 14' and in this case is not constructed as a screw ring. It is pressed onto the widened portion 11' and positively engages said portion at interengaging ridges and grooves 25 on the ring and the widened portion.
• the injection molded ring in this case forms also the sealing ring and, therefore, should be made of e.g. rubber or TPE (thermoplastic elastomer).

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• Joints Allowing Movement (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20365057

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (9)

• 1986
  • 1986-07-07 SE SE8603015A patent/SE8603015D0/sv unknown
• 1987
  • 1987-07-07 WO PCT/SE1987/000329 patent/WO1988000311A1/en not_active Ceased

Patent Citations (9)

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