Pipe joints or couplings – Molded joint – Sleeve
Patent
1994-02-22
1996-01-23
Nicholson, Eric K.
Pipe joints or couplings
Molded joint
Sleeve
285297, 285295, F16L 1310
Patent
active
054860245
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a socket for connecting two pipe ends by injection of adhesive into two annular spaces formed between the outer face of the pipe ends and the inner face of the socket. The tubular shell of the socket has a projection which extends radially inwards from its inner face and of which the side faces form a stop for the end faces of the pipe ends. The annular elements provided as centering and sealing rings have a face directed radially inwards to bear against the end faces of the shell and an axially extending face designed to bear against one of the faces of the shell. An annular flange is arranged on each side of the projection, surrounds the inner face of the shell and is designed for the sealing and centered insertion of the pipe ends. The shell, the rings and the annular flanges are made by injection molding.
2. Discussion of Related Art
One such socket is known from DE 31 09 422 A1. For connection, the pipe ends are pushed from opposite sides into the shell of the socket until they encounter the projection which extends around the inner face of the shell and acts as a stop and the annular elements provided as centering and sealing rings are clamped fast between the shell and the outer face of the pipe ends at the ends of the shell. Adhesive is injected through one or more injection openings into the annular space formed between the outer face of the pipe ends and the inner face of the socket, so that a gas-tight and water-tight connection is established between the pipes.
In some cases, the plastic pipes to be connected are distorted through prolonged storage and the effects of heat and are oval rather than round. In addition, the wall thicknesses and external diameters of the pipes vary. In order nevertheless to obtain an encircling annular space of sufficient thickness at each point of the circumference for safe injection bonding, the rings to be attached to the ends of the shell are provided. The annular flange extending around the inner face of the socket on each side of the projection is provided for the same purpose. In addition, the rings and the annular flanges are intended to prevent the escape of adhesive.
The socket is made of plastic by injection molding. Large numbers can only be economically produced when as few projections or recesses as possible are provided. However, the shell of the known socket with the encircling annular flange is made in one piece and the height of the projection forming the annular flange is relatively small so that problems arise during the injection molding of the shell.
SUMMARY OF THE INVENTION
Accordingly, the problem addressed by the present invention was to provide a socket of the type mentioned at the beginning which would be more suitable for production in large numbers by injection molding.
According to the invention, the solution to this problem is characterized in that the shell and the annular flanges consist of separate parts, each annular flange is a tubular centering and sealing ring bearing against the inner surface of the shell and, apart from the projection itself, the inner face of the shell has no projections or recesses in the region of the projection.
Injection molding is considerably simplified by the elimination of the relatively small step on the inner face of the shell of the socket. The necessary centering and sealing mentioned above in the region of the inner radial projection is provided by the separate centering and sealing rings replacing the annular flanges.
Not only projections and recesses of relatively small dimensions, but projections and recesses per se are obstacles to production by injection molding. In the known socket mentioned at the beginning, the annular elements to be fitted onto the ends of the shell engage in a shoulder extending around the inner face of the shell. According to the invention, therefore, the inner face of the shell has no projections or recesses except for the projection itself and any injection openings. This is because,
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Henkel Kommanditgesellschaft auf Aktion
Jaeschke Wayne C.
Nicholson Eric K.
Szoke Ernest G.
Trzaska Steven J.
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