Patent ID: 9625072
Date: 2017-04-18
CPC Classifications: F16L

Claim:
1. A hose arrangement ( 1 ) for a water-conveying system, comprising a flexible pressure hose ( 2 ) and a connection piece ( 4 ) arranged on one hose end ( 3 ) of the pressure hose ( 2 ), the connection piece ( 4 ) has at least one hose nipple ( 5 ) which engages in the pressure hose ( 2 ), and a ferrule ( 6 ) which engages around an outside of the pressure hose ( 2 ), the pressure hose ( 2 ) is held in at least one of a force or form-fitting manner between the hose nipple ( 5 ) and the ferrule ( 6 ), the ferrule ( 6 ) includes a sleeve portion ( 11 ) that projects beyond the hose nipple ( 5 ) at a hose-side nipple end ( 8 ) of said nipple in a direction of extent of the pressure hose ( 2 ), and the ferrule ( 6 ) includes, in the sleeve portion ( 11 ), a radially inwardly directed protrusion ( 12 ) which acts radially on and displaces the pressure hose ( 12 ) such that, compared with a clear inside diameter of the relaxed pressure hose ( 2 ), an inside diameter of the pressure hose ( 2 ) in a region of the sleeve portion ( 11 ) that extends past the hose-side nipple end ( 8 ) is equal to an inside diameter of the hose nipple ( 5 ), the ferrule ( 6 ) has profiling produced by crimping of the ferrule ( 6 ), and as a result of said profiling, an annularly encircling groove ( 14 ) is introduced into the sleeve portion ( 11 ) of the ferrule ( 6 ) on an outer circumferential side in an area past the hose-side nipple end ( 8 ), a groove depth of said groove ( 14 ) predefining a height of the protrusion ( 12 ) formed on an inner circumferential side, and the protrusion ( 12 ) deforms the material of the flexible pressure hose ( 2 ) inward such that a constriction ( 19 ) is formed, in which the inside diameter of the pressure hose ( 2 ) assumes a minimum diameter, and the constriction ( 19 ) is located adjacent to and spaced apart axially from the nipple end ( 8 ) in the direction of extent of the pressure hose ( 2 ), wherein the inside diameter of the pressure hose ( 2 ) is reduced in a region of the protrusion ( 12 ) to a dimension which is smaller than a minimum outside diameter of the hose nipple ( 5 ) and wherein the hose-side nipple end ( 8 ) and the constriction ( 19 ) have a gap therebetween and wherein the constriction ( 19 ) has an apex which is convex from the apex to the hose-side nipple end ( 8 ) and is convex in the opposite longitudinal direction, from the apex, to a portion past the ferrule( 6 ).