Hose coupler for spiral wire reinforced hoses

A hose coupling for attachment to the end portion of a hose which contains a reinforcing wire that is spirally wrapped along the length thereof and provides an undulating surface to at least one of the inside and outside surfaces of said hose, said hose coupling comprising

• an elongated main body element which has opposite first and second ends, said first end including a connector portion which is threaded so that it can be attached to another hose coupling, and said second end including an axially-extending nipple portion which is insertable in the end portion of said hose,
• a seal means provided around the outer surface of said nipple portion, said seal means extending in the axial direction of said elongated main body element a distance at least equal to the pitch of one revolution of said spirally-wrapped reinforcing wire of said hose,
• a cylindrical sleeve which is positionable over the end portion of said hose when the end portion of said hose is positioned around said nipple portion of said elongated main body element, said cylindrical sleeve having a forward end which extends towards the connector portion of said elongated body element, a rearward end which extends away from the connector portion of said elongated body element, an outer surface and an inner surface, said inner surface providing a helical projection which extends radially inwardly of said cylindrical sleeve and is located along the length thereof to project towards said seal means, and
• a back nut which is positionable over said cylindrical sleeve and includes a leading end which is connectable with said elongated main body element, a trailing end, an outer surface, and an inner surface, said inner surface tapering towards said trailing end such that, when said leading end is connected to said elongated main body element, said inner surface thereof will contact the rearward end of said cylindrical sleeve and move the helical projection on the inner surface of said cylindrical sleeve towards said seal means located around the outer surface of the nozzle portion of said elongated main body element, thus securely clamping the end portion of said hose positioned between the nozzle portion and the cylindrical sleeve.