Instant fitting for reinforced multilayer flexible tubings for fluids

Claim 1

A fitting for connection to a tube at a cut end portion thereof, which fitting comprises in combination a hollow body; a tubular bushing supported within said body and axially moveable relative thereto between an inward limit position and an outward limit position, said bushing having projections disposed to internally grip the tube to be connected to the fitting, said body and bushing having mutually interfering parts that coact when the bushing is in its inward limit position to constrain said bushing against further inward axial movement and against rotation to aid the emplacement of the tube end portion into gripping engagement with the projections of the bushing, said body having an inlet allowing the insertion of the end portion of the tube into the fitting for gripping engagement with the bushing; and a ring within said body and positioned in circumferentially surrounding relation to the tube end portion inserted into the fitting, said ring having a conical surface portion, said bushing being axially moveable to an outward limit position at which the end portion of the tube gripped by the the bushing is compressed between the bushing and the conical portion of said ring to establish a fluid-tight seal thereat, said ring, end portion of the tube, and bushing being rotatable in unison relative to said body, and constrained against further outward axial movement relative to said body when the bushing is in said outward limit position.