Pipe joints or couplings – End to side or plate – Sput
Patent
1989-12-21
1992-09-29
Arola, Dave W.
Pipe joints or couplings
End to side or plate
Sput
285196, F16L 4100
Patent
active
051509288
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a coupling sleeve for connection of a branch pipe to a main pipe, comprising at least:
an insertion end with an outwardly flanged edge which can be allowed through by an opening in such main pipe in which said insertion end is to be accommodated,
a connecting end;
an annular sealing means of resilient material which is disposed round the insertion end and rests against the flanged edge, and which can deform through the exertion of compression stress for fixing the insertion end in sealing fashion in the opening in such main pipe
a stop part which is provided above the sealing means and has a stop for said sealing means, and which can assume a fixed position relative to the external surface of said main pipe during and after the fixing in sealing fashion of the insertion end in the opening in said main pipe;
stretching means for moving the insertion end outwards relative to the wall of said main pipe, for exerting compression stress on said resilient sealing means while they are confined between the flanged edge of the insertion end and the stop of the stop part.
Such a coupling sleeve is known from Applicants' Dutch Patent Application 7605427.
Such a known coupling sleeve comprises a stop part in the form of a sliding part disposed round the insertion end.
Such a coupling sleeve is fixed in an opening formed in the surface of the main pipe by tightening a stretching screw which on one side rests against the sliding part of the sleeve and on the other turns in the screw thread disposed on the outside of the sleeve. Tightening the stretching screw causes the insertion end to be moved outwards, so that the sealing means consisting of resilient material are compressed and increase so much in size that a good seal of the insertion end in the main pipe is achieved.
Such a known coupling sleeve has the disadvantage that the seal achieved depends on the extent of tightening of the stretching screw, and said seal can therefore vary from case to case and from person to person carrying out the tightening. Besides, there can be a risk of damage and/or leaking if the stretching screw is tightened too much.
An object of the present invention is to provide a solution to the above problem, in that after fixing the coupling sleeve in a sealing fashion the connecting end and the insertion each assumes a predetermined position relative to the outside wall of the main pipe, and the stretching means comprises at least two identical stretching elements which are provided at equal spaced intervals on the periphery of the coupling sleeve and each is capable of setting a predetermined fixed distance between fixed points connected to the outside periphery of the insertion end and the stop part so that a predetermined fixed compression of the sealing material is achieved.
With a coupling sleeve according to the present invention the same end position of the insertion end and the connecting end relative to the pipe wall is always achieved, while in addition a fixed compression of the sealing means, for example an elastomer sealing means, is always achieved. Damage and/or leakage, such as that which was possible with too great tightening in the above-described known coupling sleeve, are no longer possible.
In their most simplified form, the stretching elements comprise, for example, stretching bars resting with one end against a fixed point connected to the external surface of the insertion end, and resting with the other end on a fixed point relative to the periphery of the main pipe after fitting in the end position; the latter point will be on the top surface of the stop part which can assume a fixed position relative to the main pipe.
In particular, the coupling socket according to the invention is designed so that the connecting end and the insertion end of the branch pipe are separated parts and the connecting end and stop part in the direction of the connecting end may mate with the non-moving connecting end in sealing fashion with the use of a suitable sealant.
In this embodiment the stop part rests ag
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Lodder Bernhard
Oostenbrink Albertus A.
Paulen Adriaan
van Dijk Berend J.
Arola Dave W.
Bordas Carol I.
Wavin B.V.
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