Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D41/00—Application of procedures in order to alter the diameter of tube ends
  • B21D41/02—Enlarging
  • B21D41/021—Enlarging by means of tube-flaring hand tools

Definitions

• pipe couplings are used wherein a nut element is fixedly screwed over a flared pipe element on an end piece which is for example fixed to a wall or tabletop.
• the pipes are usually manufactured from plastic material as it is easy to make a flared or truncated cone-shaped extremity on ends of these pipes.
• plastic pipes have a short life span parti ⁇ cularly in respect of gas-tightness.
• preference is given to pipes of stainless steel for beer and/or soft drinks.
• the present invention provides a tool for arranging on a pipe an approximately truncated cone-shaped pipe end, comprising:
• the above stated tool can be embodied with dimensions which are hardly larger than a so-called pipe wrench, which is suited as hand-tool and which considerably facilitate installation operations, particularly in places which are difficult of access, such as under and/or behind a bar table in a catering establishment.
• hand-tools for widening pipe ends are known e.g. from the Netherlands patent applications 76- 12.841 and 77-12.995, wherein however these do not relate to the arranging of a truncated cone-shaped pipe end.
• Known apparatus e.g. as described in GB-A-2.098.529, for flaring stainless steel pipes, are of heavy weight, and need a vase, such as a bench, which has to be transported to a installation location.
• the present invention further provides a pipe coupling provided with an end piece provided with screw thread, a stainless steel, approximately truncated cone- shaped pipe end and a nut element provided with internal screw thread which engages over the pipe end and is screw- able onto the screw thread of the end piece.
• Fig. 1 shows a perspective and partially exploded view of a first preferred embodiment of the tool according to the present invention
• Fig. 2A-2C show three views in section of the tool of fig. 1 in three respective operating positions;
• Fig. 3 shows a view in section of a preferred embodiment of a pipe coupling according to the present invention
• Fig. 4 is an exploded side view of the pipe coupling of fig. 3.
• a preferred embodiment of a tool 1 comprises a first side plate 2 onto which a first holding jaw 3 is fixedly attached, while a second holding jaw 4 is provided with protruding portions 5 which are movable up and downward in slots 6.
• the slot 6 which is provided in a second side plate 7 can be seen in fig. 1.
• the second side plate 7 is attachable to the fixed holding jaw 3 using screw bolts 8, 9.
• a first operating arm 11 is pivotally attached using pivot shaft 12, rings 13 and nuts 14.
• a cam part 1.6 is arranged between operating arm 11 and pivot shaf 12.
• a second operating arm 17 is further attached pivo- tally between side plates 2 and 7 using pivot shaft 18, rings 19 and nuts 20.
• the cam part 21 coupled to operating arm 17 is provided with a roller element 22.
• a spring member 26 is arranged which engages onto the protruding portion 5, in order to urge the holding jaw 4, in the position shown in fig. 1, into the open wide position of fig. 1.
• a pipe end (not shown) is inserted between holding jaws 3, 4 onto mandrel 30, wherein the mandrel 30 provided with a tapering end 31 is pressed to its retracted position.
• holding jaw 4 (fig. 2B) is subsequently constrained downward, for which purpose the cam part 16 is provided with a rounded side.
• Holding jaws 3, 4 are preferably provided with screw thread in order to clamp onto a pipe end such that it will not slide during the following treatment with the tool 1 according to the present invention.
• the operating arm 17 is then brought into the posi ⁇ tion shown in fig. 2C and pressed into the pipe end (not shown) , wherein the roller element 22 rolls along the rear end of the mandrel 30. Since the forces which must be exerted on a pipe end of stainless steel are considerable, the mandrel 30, in particular the tapering tip 31 thereof and the holding or clamping parts 3, 4 are made of hardened steel.
• the preferred embodiment shown and described is only slightly larger than a pipe wrench and has a weight of approximately one kilogram or slightly more.
• a pipe coupling 40 (fig. 3, 4) comprises an end piece 41, which is for example attached to a wall or table- top using screw thread 42, in addition to a second screw thread 42 onto which a nut element 44 can be screwed.
• the nut element 44 is pushed over the pipe end before a flared end 46 is arranged thereon.
• a sealing ring 47 is received between pipe end 45 and end piece 41.
• the flare 46 is dimensioned such that a practically seamless transition is created between pipe end 45 and end piece 41, which is particularly important for avoiding contamination in such a pipe coupling as well as for preventing frothing of carbonated drinks.
• the present invention is not limited to the pre ⁇ ferred embodiment shown and described here; the rights requested are defined by the following claims.
• the present invention offers possibi ⁇ lities for applying stainless steel pipes anywhere where pipes of copper or plastic have up until now been applied.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Table Equipment (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=19860010

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (6)

• 1991
  • 1991-12-09 NL NL9102050A patent/NL9102050A/nl not_active Application Discontinuation
• 1992
  • 1992-12-08 AU AU30866/92A patent/AU3086692A/en not_active Abandoned
  • 1992-12-08 EP EP92924712A patent/EP0690754B1/de not_active Expired - Lifetime
  • 1992-12-08 WO PCT/EP1992/002863 patent/WO1993011889A1/en not_active Ceased
  • 1992-12-08 DE DE69231283T patent/DE69231283T2/de not_active Expired - Fee Related
  • 1992-12-08 JP JP5510608A patent/JPH07506766A/ja active Pending

Non-Patent Citations (1)

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