Tubing end and method for forming

Pipes and tubular conduits – Combined – With end structure

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138177, 72367, F16L 900

Patent

active

058100547

ABSTRACT:
The present invention comprises a tubing end fitting and a method of forming thereof wherein the fitting is formed out of the tubing itself. In a first step, the tubing end is compressed in a linear direction and shortened forming a first annular ridge extending around the tubing spaced from the end of the tube by a small tube portion. At the same time, the small tube portion diameter is reduced slightly. The small tube end portion is again compressed slightly in a linear direction initiating the formation of a second annular ridge spaced from the first annular ridge, while at the same time again slightly reducing the diameter of the remaining tubing end portion. In a third step the tubing end is again compressed in a linear direction completing the formation of the second annular ridge. In a fourth step the remaining tube end portion is flared outwardly forming an o-ring receiving groove between the second annular ridge and the tube end.

REFERENCES:
patent: 2652895 (1953-09-01), Arrowood
patent: 3000424 (1961-09-01), Weise
patent: 4362187 (1982-12-01), Harris et al.
patent: 4850621 (1989-07-01), Umehara
patent: 5096231 (1992-03-01), Chisnell et al.
patent: 5103666 (1992-04-01), Schroeder
patent: 5105854 (1992-04-01), Cole et al.
patent: 5472016 (1995-12-01), Szabo

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