Coupler for hose lines of high-pressure cleaning and spraying equipment

Claim 1

A coupler for hose lines of high pressure cleaning equipment and high-pressure spraying equipment comprising a nipple attached to the end of a first hose and having an inner throughhole forming an inner sealing surface, said nipple being surrounded by a sleeve which is open at its end facing a second hose, secured against displacement in the direction of the second hose, and bears on its inner side catch projections which extend into the interior of said sleeve and are separated by a wall area free of said catch projections, said catch projections characterized by a recess on the side facing the first hose which has a surface inclined in relation to the longitudinal axis of said sleeve, a connecting piece attached to the end of the second hose and having an outer sealing surface which lies in sealing contact with the inner sealing surface of said nipple when said connecting piece is inserted into said nipple, said connecting piece having on its outer wall outwardly projecting catches which are complementary to the catch projections of the sleeve, extending circumferentially over an area maximally as great as the area on the inner wall of the sleeve free of the catch projections, and which have on their side facing the second hose, locking lugs which slip into the recesses in the catch projections of said sleeve, and a compression spring between said nipple and said connecting piece, characterized in that the compression spring is located between the inner wall of the sleeve and the nipple and is supported by an inward projection of the sleeve adjacent the first hose and by the catch projections on the connecting piece, said projections having locating faces for the compression spring against which the compression spring rests when the connecting piece is inserted into the sleeve the locking lugs on the catches on the connecting piece being bounded on their front edge relative to the direction of turning by a surface inclined relative to the longitudinal axis of the connecting piece towards its free end.