Patent ID: 7624504

Claim:
A method of attaching a hose coupling to a hose, the hose coupling having a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, the nipple having a hose insertion side and a hose anti-insertion side, the socket having a radially inner surface having at least one circumferentially extending annular hose gripping projection thereon, the hose having an elastic tube layer formed of polytetrafluoroethylene and a reinforcing layer disposed radially outwardly thereof , the method comprising the steps of: inserting one end of the hose between the nipple and socket; and crimping the socket from a radially outer side thereof by means of crimping claws circularly placed radially outwardly of the socket to radially inwardly reduce the socket with gaps being created between adjacent claws, thereby protruding the at least one circumferentially extending annular hose gripping projection into said one end of the hose so that a part of the reinforcing layer into which the at least one circumferentially extending annular hose gripping projection has been protruded is protruded into the elastic layer to extrude away and break apart the elastic layer into which the part of the reinforcing layer has been extruded, and so that the part of the reinforcing layer is pressed against a radially outer surface of the nipple and directly gripped between the at least one circumferentially extending annular hose gripping projection and the nipple, while compressing said one end of the hose by the radially inner surface of the reduced socket.