US 8,523,242 B2Granted

Connection-structure of a flexible tube

AssigneesNitta Corporation, Fts Co., Ltd.

InventorsSatoru Hosotani, Yoshinari Rokken, Jun Okada, Takeshi Amano

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Abstract

A connection-structure of a flexible tube, in which the flexible tube is fitted to an end portion of a metal pipe, comprises an annular projection, a first radially enlarged portion, a seal ring and a second radially enlarged portion. The annular projection is formed on an outer surface of the end portion of the metal pipe. The first radially enlarged portion is formed on the tip side of the metal pipe relative to the projection, defining a first annular groove with the projection. The seal ring is fitted into the annular groove. The second enlarged portion is formed on the base side of the metal pipe relative to the projection, defining a second annular groove with the projection. The tip portion of the flexible tube is positioned close to the maximum diameter portion of the second enlarged portion.

Claims10

Dependent claims

A connection-structure of a flexible tube, in which said flexible tube is tightly fitted to an outer surface of an end portion of a metal pipe, comprising:

an annular projection that is formed on said outer surface of said end portion of said metal pipe, said annular projection circumferentially extending over a whole circumference of said metal pipe;
a first radially enlarged portion that is formed on a tip side of said metal pipe relative to said annular projection, said first radially enlarged portion defining a first annular groove with said annular projection;
a seal ring that is fitted into said first annular groove;
and
a second radially enlarged portion that is formed on a base side of said metal pipe relative to said annular projection, said second radially enlarged portion defining a second annular groove with said annular projection;
a tip portion of said flexible tube being positioned on said second radially enlarged portion and close to a maximum diameter portion of said second radially enlarged portion.

3 more elements

Dependencies are inferred from the claim text.