Metal fusion bonding – Process – Encasing a rodlike core within a substantially coextensive...
Patent
1995-05-18
1997-07-22
Pirlot, David L.
Metal fusion bonding
Process
Encasing a rodlike core within a substantially coextensive...
228135, 29453, 29523, 156 91, 156158, 156293, 138109, 138155, B23K 3102, G01B 528, F16L 922
Patent
active
056496621
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of providing a radially outwards directed bead at the end rim of a pipe made from thin plate. The invention furthermore relates to a pipe element to be used when implementing the method.
It is known to provide pipes made from thin plate--for instance spirally wound pipes--with beads or similar flanges at their end rims, which allow two pipes to be connected tightly to each other by means of clamps or similar devices engaging the adjacent beads at the end rims and pulling them against each other or against corresponding sealing surfaces of the clamping device. The manufacture of beads at the end rim of a pipe is performed by flanging the ends of the pipes in powerful special machines at a factory. It has therefore not until now been possible at a later point in time to add beads at the end rims of pipes which have been shortened which is a significant drawback.
The object of the present invention is to provide a method of providing a bead at the end rim of a pipe made from thin plate, thus avoiding the drawback mentioned above.
This is according to the invention achieved by a method of the type mentioned above, characterized by inserting a short pipe element with a radially outwards directed bead at one end rim into the pipe, and by rolling a radially outwards directed bead in the pipe element at its other end and in the pipe, thereby firmly fixing the pipe element inside the pipe.
By utilizing ready-made short pipe elements provided with a bead at the rim of one end, it is only necessary at the building site to insert the pipe element into a shortened pipe, in order to subsequently roll a bead at the end of the pipe element positioned inside the pipe by means of a conventional beading machine. Thus a bead in the pipe wall is also produced, and the engagement of the two overlapping beads causes the pipe element to be firmly fixed inside the pipe.
This method has the further advantage that the described rolling of the bead produces a smooth transition between the pipe and the pipe element, thereby avoiding the generation of noise or pressure loss during transportation of material through the pipe.
According to a preferred embodiment, the pipe element may be provided with at least two radially outwards directed beads before insertion into the pipe, where said beads after the insertion cause the pipe element to be firmly clamped and fixed inside the pipe.
The beads are made such that the diameter of the pipe element measured at the top of a bead substantially corresponds to the inside diameter of the pipe. This assures a tight fit when the pipe element is inserted into the pipe. The beads are placed such that they are separated by a suitably large distance, thereby allowing the pipe element to be guided coaxially into the pipe.
In further embodiments the pipe element may after insertion be spot welded to the pipe, or radially outwards directed embossments may be embossed into the pipe and the pipe element, thus achieving a further fixing of the pipe element inside the pipe.
In other embodiments the pipe element may be coated by a sealing material, which may be an elastic material, preferably rubber or polytetrafluoroethylene (Teflon), or the sealing material may be a mastic.
The sealing material may be placed in advance on the outside of the pipe element. A rubber layer may for instance be attached by bonding or vulcanization, or the sealing material, for instance a mastic, may be sprayed on immediately before the pipe element is Joined to the pipe.
A further embodiment is characterized in that an adhesive is applied to a part of the outer surface of the pipe element. Thus a further strengthening of the joint between the pipe element and the pipe is achieved.
The invention also relates to a pipe element for use in performing the method described above, said pipe element being characterized in that it has a radially outwards directed bead at one end rim.
The invention will now be explained in more detail by means of an embodiment and with reference to the drawing, in which
FIG.
REFERENCES:
patent: 1484968 (1924-02-01), Schlafly
patent: 3208136 (1965-09-01), Joslin
patent: 3819849 (1974-06-01), Baker
patent: 3832259 (1974-08-01), Van Zon
patent: 3924883 (1975-12-01), Frank
patent: 4251094 (1981-02-01), Pinto
patent: 4653542 (1987-03-01), Tascher
Andresen Werner J.
Krichau Peter
Knapp Jeffrey T.
Lindab A/S
Pirlot David L.
LandOfFree
Method and a pipe element for providing a radially outwards dire does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and a pipe element for providing a radially outwards dire, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a pipe element for providing a radially outwards dire will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1555168