Fitting for a flexible metal hose

A flexible hose assembly, comprising:

• corrugated metal tube including a first end and an interior surface;
• and
• a fitting permanently crimped to said first end of said tube, said fitting comprising:
• a ferrule having first and second ends, said second end of said ferrule circumscribing said first end of said corrugated metal tube,
• an elongated, tubular stem comprising a first end adapted to engage a corresponding fitting surface, and a second end extending through said first end of said ferrule and into said corrugated metal tube,
• an independently mounted tubular sealing member on said second end of said stem, between said stem and said corrugated metal tube, said sealing member having an undulating outer surface corresponding to said interior surface of said corrugated metal tube such that said undulating outer surface contacts substantially all of said interior surface of said corrugated metal tube along the length of said sealing member, and
• external threads formed on said stem, between said first and second ends, and corresponding internal threads formed on said first end of said ferrule, for threadably coupling said stem and said ferrule.

A method of securing a fitting to a flexible hose having a corrugated metal tube, the fitting including a ferrule, a stem and a sealing member having a contoured outer surface corresronding to the interior surface of the corrugated metal tube, the method comprising:

• inserting the sealing member into the corrugated metal tube such that the contoured outer surface contacts substantially all of the interior surface of the corrugated metal tube along the length of the sealing member:
• placing the ferrule over the end of the corrugated metal tube:
• inserting an end of the stem into the sealing member disposed within the corrugated metal tube:
• threadably coupling the ferrule to the stem:
• and crimping the ferrule to compress the corrugated metal tube and the sealing member between the ferrule and the stem.

A fitting for a hose formed from corrugated metal tube, the fitting comprising:

• an elongated, tubular stem having a first end adapted to engage a corresponding fitting surface, and a second end configured to be received in the hose;
• a ferrule having a first end configured to receive said second end of said stem, and a second end configured to receive the end of the hose, said ferrule configured to be crimped to the end of the corrugated metal tube to thereby secure the fitting to the hose;
• an independently mountable sealing member sized to be received over said second end of said stem, and having a contoured outer surface corresponding to the interior surface of the corrugated metal tube such that said contoured outer surface contacts substantially all of the interior surface of the corrugated metal tube along the length of the sealing member;
• external threads formed on said stem, between said first and second ends;
• and
• internal threads formed on said first end of said ferrule and configured to engage said external threads on said stem for threadably coupling said stem and said ferrule;
• wherein said first end of said ferrule has a first outer diameter, and said second end of said ferrule has a second outer diameter sized to be initially greater than said first outer diameter, said ferrule configured such that said second end may be subsequently deformed to be approximately equal to said first outer diameter during attachment of the fitting to the hose.