Pipe joints or couplings – Particular interface – Tapered
Patent
1993-12-17
1994-12-06
Nicholson, Eric K.
Pipe joints or couplings
Particular interface
Tapered
2853342, 285247, 285249, 285255, F16L 3300
Patent
active
053704240
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a pipe connection, in particular for plastic pipes and hoses or the like, comprising a support portion disposed in the interior of the pipe to be connected, and a clamping means disposed on the outside of the pipe.
2. Description of the prior Art
German utility model No. 89 11 166 discloses a pipe connection comprising an externally disposed clamping means and an internally disposed support portion. The clamping means comprises a fitting and one or two one-part cap nuts. In the region of the end of the pipe the fitting is provided with an annular recess and the recess is in turn provided with a constriction or notching means. That pipe connection operates satisfactorily when substantial pressure loadings are involved and at high temperature, but leaks occur at high pressure loadings. In addition the pipe can be locally loaded by the frictional forces produced upon rotation of the cap nut or nuts, to such a degree that the resulting pressing or squeezing forces damage the pipe.
SUMMARY OF THE PRESENT INVENTION
The object of the invention is therefore that of providing a pipe connection of the kind set forth in the opening part of this specification, which ensures satisfactory sealing integrity of the pipe connection, even under high pressure loadings, and which permits the application of a higher force in assembly thereof.
That object is attained by the features in the characterizing portion of the present invention.
The projections arranged on the clamping means are pressed into the outside of the pipe to be connected upon assembly of the pipe connection, even in relation to high pressures.
The clamping means is desirably divided into a sealing portion and a pressing portion which are movable relative to each other, in accordance with the function of the clamping means of providing a satisfactory sealing effect, namely both a form-locking or positive connection and also a force-locking connection.
In an advantageous embodiment the sealing portion is of a tubular configuration and as viewed from the end of the pipe to be connected, comprises a first portion whose inside diameter approximately corresponds to that of the pipe to be connected and which is adjoined by a second portion which engages in the form of an end piece from the outside over the pipe to be connected.
The end piece is advantageously provided with a first part, as viewed from the end of the pipe to be connected, the inside diameter of said first part approximately corresponding to the outside diameter of the pipe to be connected and the first part being adjoined by a second part which has a conical enlargement in respect of its inside diameter, on which the projections are arranged.
The projections advantageously extend in an annular configuration around the end piece.
In that arrangement, a sawtooth-like configuration of the annular projections may be considered to be advantageous; particularly advantageous are undercut configurations which extend perpendicularly to the axis of the tube, and apex or crest surfaces which lie on the surface of a truncated cone, wherein the cone surfaces should preferably form an angle of about 10.degree. to the axis of the pipe.
In order to ensure sealing integrity of the pipe connection, the invention also proposes another integer as set forth in the characterizing portion of the present invention.
Desirably the pressing portion is of a tubular configuration. In a preferred embodiment the pressing portion is provided with a sliding portion which comes to bear against the tube to be connected, with its pressing surface, and which is carried with its surfaces in a pressing portion which slides on the sliding portion.
The sliding portion is advantageously in the form of a sliding ring which has a pressing surface extending inclinedly relative to the axis of the tube, and which is disposed in the pressing portion with sliding surfaces which extend horizontally and perpendicularly to the axis of the tube.
It is considered advantag
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Nicholson Eric K.
Ruppert Hans-Peter
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