Patent · US Expired

Pipe socket forming

US4403938A · kind A · utility

11Cited by

7References

4Claims

0Family size

Assignee

James Hardie & Coy. Pty. Limited · AU

Inventors

Barry G. Seach · Parramatta, AU
Hans Muller · Steinheim, DE
Solomon E. Cohen · Parramatta, AU

Key dates

Filing date	Mar 14, 1979
Grant date	Sep 13, 1983
Priority date	—
Expiry date	Mar 14, 1999

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S425/218
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

To ensure that a socket formed on a pipe-end in plastically deformable condition is in no part thinner than the pipe material out of which it is made, the pipe-end is first enlarged in diameter and encased within a contour die formed as envelope for the external shape required of the socket. The enlarged pipe-end is then longitudinally compressed to thicken it and internally formed so as to smooth the internal surface of the pipe-end and impose on it the internal shape and dimensions required of the socket. The required socket shape preferably includes a circumferential groove to house a resilient sealing ring.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.