Joint secured against sliding

US4805932A · kind A · utility

Assignee

• Eisenwerke Friedrich Wilhelm Duker GmbH & Co. · DE

Inventors

• Erich Imhof · Laufach, DE
• Manfred Vorbeck · Laufach, DE

Key dates

• Filing date: Mar 4, 1987
• Grant date: Feb 21, 1989
• Expiry date: Mar 4, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L37/0925
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A spigot-and-socket joint which is secured against pulling apart, particularly for socket pipes manufactured by centrifugal casting or molding, wherein the spigot end of one pipe is pushed into the socket end of another pipe, with radial play, comprises a sealing ring and a gripping ring in the socket pipe, the gripping ring comprising a plurality of gripping segments mutually spaced circumferentially and each having a spherically convex radially outer surface and being interconnected in the circumferential direction by a vulcanized intermediate piece of rubber or the like, and a toothed configuration on the radially inner surface, so that when axial tensile forces arise at the joint, the toothed configurations are pressed radially inwardly against the spigot end by interaction of the spherically convex surfaces with an interior conical surface of the pipe socket which interior surface narrows in the direction of the distal end of the socket. In order to effectively eliminate relative radial movements of the gripping ring when the joined pipes are first subject to interior fluid pressure, an elastomeric holding piece is formed on the gripping ring, which gripping ring is separate f…