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
  • F16L41/00—Branching pipes; Joining pipes to walls
  • F16L41/04—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
  • F16L41/06—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe

Definitions

• This invention relates to a pipe coupling for connecting a branch pipe to a feed pipe without the necessity of cutting down or stopping the flow in the feed pipe.
• a pipe coupling of the above mentioned kind is previous ⁇ ly disclosed in Swedish Patent No. 7910060-8 and comprises coupling parts sealingly embracing the feed pipe, a cylind ⁇ rical guide passage-way formed in the coupling parts, a cylindrical piston sealingly inserted in the guide passage ⁇ way, said piston being at its inner end provided with a knife-shaped cutting-up means and formed with a passage ⁇ way for flow connection between the feed pipe and the branch pipe connected to the coupling part.
• a portion of the feed pipe projects in radial direction into the guide passage-way and knife-shaped means of the piston is off ⁇ set to said projecting portion of the feed pipe and is arranged to cut up a hole in the feed. pipe upon rotation of the piston without translatoric movement.
• the edge of the knife-shaped means is arranged to extend longidudinally relative to said piston from the point at least up to a level with the mantle surface of said feed pipe positioned furthest into the guide passage-way and the piston has an axis directed axially relative to the feed pipe in order to be able to cut up, upon said rotation, two holes posi ⁇ tioned along the feed pipe at a distance from each other with an intermediate bridge.
• the advantage of the known pipe coupling is that the flow area of the holes can be made at least as large as the cross section area of the feed pipe.
• a disadvantage of the known pipe coupling is, however, that is has proved not to manage feed pipes of harder materials than copper.
• the pipe coupling according to the invention can be used both for thin-walled steel tubes and for copper tubes.
• the knife- shaped means has an edge positioned only in the transverse plane of said piston with an extension along substantial ⁇ ly radial direction of the piston and that the axis of the piston is directed transversally relative to the axis of the feed tube with a displacement relative to the centre of the feed pipe.
• said edge is provided with a point positioned inwardly relative to the periphery of said piston and the axis of the piston is directed along substantially tangential direction relative to the feed pipe.
• Fig. 1 shows a front view of a pipe coupling in a preferred embodiment connec ⁇ ted to a feed ip wherein in elucidating purpose a piston included in the pipe coupling is omitted
• Fig. 2 is a cross section of the pipe coupling accor ⁇ ding to Fig. 1 and furthermore shows a cross section and a side view of the piston incorporated in the pipe coupling.
• Fig. 3 is a view from below showing a cutting means of the piston
• Fig. 4 is a view from above showing the pipe coupling.
• the pipe coupling according to the invention consists of two coupling parts 2 and 3 sealingly embracing a feed pipe 1.
• the coupling parts 2 and 3 are bv screws 4 fixed relative each other and embrace the feed piDe 1.
• One of the coupling parts 3 is provided with a cylindrical guide passage-way 5 for a likewise cylindrical piston 6.
• the piston 6 is at its inner end 7 provided with a knife-shaped cutting means 8 and is formed with a channel 9 for flow communi ⁇ cation between the feed pipe 1 and the connection 10 pro ⁇ jecting from the coupling part 3 for a branch pipe (not shown) .
• the cutting means 8 of the piston 6 is positioned laterally of the projec ⁇ ting portion of the feed pipe 1 and is upon rotation of the piston 6 without translatoric movement thereof arranged to cut up a hole 11 in the feed pipe 1.
• the knife-shaped cutting means 8 has according to the invention an edge 12 positioned only in a transverse plane of the piston 6 with an extension along substantially radial direction thereof and the axis of the piston 6 is directed transversally relative to the axis of the feed pipe 1 with a displacement relative to the centre of the feed pipe.
• the edge 12 is provided with a point 13 positioned inwardly relative to the periphery of the piston 6 and the axis of the piston is directed along substantially tangential direction relative to the feed pipe 1.
• the piston 6 is arranged to be rotated one revolution clock ⁇ wise for cutting up the hole 11 in the feed pipe 1.
• the inner end 7 * of the piston 6 is in the preferred embodiment in a manner known per se through the Swedish patent No. 7910060-8 plough-shaped for up-folding a material 14 cut out from the feed pipe 1 into the guide passage-way 5.
• cut-out material 14 accordingly does not follow a flow in the pipe coupling, nor by fol ⁇ ding downwardly into the flow disturbs the flow, an effec ⁇ tive fastening of the pipe coupling in its position of the feed pipe 1 is established.
• the piston 6 After the cutting the piston 6 is used as valve body for controlling the flow through the connection 10.
• the pis ⁇ ton 6 is for this purpose provided with a sealing 15 which after rotation half a revolution closes the opening between the channel 9 and the connection 10.
• the piston 6 is provided with a sealing ring 16.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)
• Branch Pipes, Bends, And The Like (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20366242

Family Applications (1)

Country Status (5)

Citations (3)

• 1986
  • 1986-11-10 SE SE8604810A patent/SE455437B/sv not_active IP Right Cessation
• 1987
  • 1987-11-06 DE DE8787907538T patent/DE3773214D1/de not_active Expired - Lifetime
  • 1987-11-06 WO PCT/SE1987/000522 patent/WO1988003627A1/en active IP Right Grant
  • 1987-11-06 AT AT87907538T patent/ATE67571T1/de not_active IP Right Cessation
  • 1987-11-06 EP EP87907538A patent/EP0333729B1/en not_active Expired

Patent Citations (3)

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