Intrinsic gauging for tube fittings

Details Intrinsic gauging for tube fittings Intrinsic gauging for tube fittings

2005-09-13

2005-09-13

Fulton, Christopher W. (Department: 2859)

Geometrical instruments

Gauge

Comparator

C033S645000, C285S093000, C411S014000

Reexamination Certificate

active

06941668

ABSTRACT:
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 that has a predetermined relationship with the coupling nut when the fitting has been initially pulled-up. The marking may be realized as a precision groove or recess machined into a surface. The groove can be made more easily visually perceptible such as by roughening, knurling or coloring the surface. 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.

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