INDICATOR FOR TUBE FITTINGS

WIPO Patent Application WO2004013527

A3

An intrinsic gauging device for a ferrule type tube fitting of the type having a coupling nut, a coupling body and at least one ferrule, includes a precisely formed marking on the coupling body that is visually perceptible when the coupling is in a finger tight position, and that is covered or visually imperceptible or otherwise has a predetermined relationship with the coupling nut when the fitting has been initially pulled-up. In a preferred form, the marking is realized as a precision groove or recess machined into a surface of the coupling body. The groove can be made more easily visually perceptible such as by roughening or knurling the surface, or coloring the surface, for example. The groove defines an edge at a precise position that corresponds to a predetermined axial displacement of the nut relative to the body for initial pull-up. The marking may also be formed with a precise dimension such as an axial length to provide a second edge that corresponds to a predetermined axial displacement of the nut relative to the body beyond initial pull-up for fitting assemblies that are remade.

WILLIAMS PETER C (US)
JOHNSTON LONNIE E (US)
KARKOSIAK JOHN D (US)
BABUDER GERALD A (US)
MOGHE SANJEEV S (US)

PCT/US2003/007739

April 29, 2004

March 12, 2003

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SWAGELOK CO (US)
WILLIAMS PETER C (US)
JOHNSTON LONNIE E (US)
KARKOSIAK JOHN D (US)
BABUDER GERALD A (US)
MOGHE SANJEEV S (US)

F16L19/00; F16L19/065; F16L19/075; (IPC1-7): F16L19/08; F16B1/00; F16B33/06; F16L19/065

WO2001020214A1	2001-03-22
WO2001016516A1	2001-03-08

US3101207A	1963-08-20
US5117909A	1992-06-02
US3687493A	1972-08-29

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