Conduit assembly for conveying volatile fluids

A gasoline dispensing assembly having fluid passages therein for conveying gasoline in one direction to a tank and returning gasoline vapors from said tank, said assembly comprising a flexible inner conduit defining an inner one of said fluid passages, a flexible outer conduit having an inside diameter and being disposed around said inner conduit, said conduits being relatively sized to define an outer one of said fluid passages between said conduits, a coupling having means fixing one end portion of said outer conduit thereto in sealed relation, a tubular fitting having a cylindrical outermost surface which has a diameter smaller than said inside diameter and having an end portion received within an associated end portion of said inner conduit, a fastening device fastened concentrically around said associated end portion of said inner conduit with said end portion of said fitting disposed therewithin and fixing said fitting to said inner conduit, said fastening device in its fastened condition having a maximum outside diameter which is approximately equal to the maximum outside diameter of said associated end portion of said inner conduit, means holding said fitting and said associated end portion of said inner conduit in said coupling concentrically within said outer conduit to define a continuation of said outer passage between said fitting and coupling while preventing axial movement of said fitting relative to said coupling, a gasoline dispensing nozzle having a coupling adapter provided therein, said coupling being detachably fastened to said adapter, and said adapter having first means therein adapted to receive said fitting and communicate only with said inner passage and having second means therein adapted to communicate only with said outer passage.

A conduit assembly having fluid passages therein for conveying a volatile liquid in one direction to a container and returning vapors of said volatile liquid from said container, said assembly comprising a flexible inner conduit defining an inner one of said fluid passages, a flexible outer conduit having an inside diameter and being disposed around said inner conduit, said conduits being relatively sized to define an outer one of said fluid passages between said conduits, a coupling having means fixing one end portion of said outer conduit thereto in sealed relation, a tubular fitting having a cylindrical outermost surface which has a diameter smaller than said inside diameter and having an end portion received within an associated end portion of said inner conduit, a fastening device fastened concentrically around said associated end portion of said inner conduit with said end portion of said fitting disposed therewithin and fixing said fitting to said inner conduit, said fastening device in its fastened condition having a maximum outside diameter which is approximately equal to the maximum outside diameter of said associated end portion of said inner conduit, means holding said fitting and said associated end portion of said inner conduit in said coupling concentrically within said outer conduit to define a continuation of said outer passage between said fitting and coupling while preventing axial movement of said fitting relative to said coupling, and a coupling adapter detachably fastened to said coupling and having first means therein adapted to receive said fitting and communicate only with said inner passage and having second means therein adapted to communicate only with said outer passage.