Swagable fitting with inner curved grooves

Details Swagable fitting with inner curved grooves Swagable fitting with inner curved grooves

1990-03-20

1992-01-14

Arola, Dave W.

Pipe joints or couplings

Particular interface

Interlocked or overlapped

2853822, 285417, 29517, 29520, F16L 1300

Patent

active

050804065

ABSTRACT:
A fitting for attachment to a tube by external swaging is disclosed. The fitting includes an outer surface that fits within the dies of a swaging tool, and an inner surface that includes a plurality of axially spaced annular grooves that bite into the tube upon swaging. A reinforcing ring surrounds the outer surface of the fitting in the area of the annular grooves to provide reinforcement. The fitting also has an outer end with a special double tapered configuration such that, after swaging, the tube and inner surface of the fitting in the area of the annular grooves forms a wedge that equally distributes the load and increases the tube retention capability of the fitting. The fitting also includes a tapered shoulder for positioning the fitting within the dies of the swaging tool in a reliable and repeatable manner, and further includes tapered axial grooves on the inner surface of the fitting for preventing torsional movement between the fitting and the tube after swaging. The fitting and the tube also have a balanced configuration which minimizes fretting.

REFERENCES:
patent: 2341003 (1944-02-01), Watson
patent: 3572779 (1971-03-01), Dawson
patent: 3675949 (1972-07-01), Dawson
patent: 3711132 (1973-01-01), Nickerson
patent: 3848451 (1974-11-01), Allin
patent: 4289340 (1981-09-01), Press et al.
patent: 4305608 (1981-12-01), Stuemky et al.
patent: 4407532 (1983-10-01), Patel et al.
patent: 4626001 (1986-12-01), Lee

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