Clamp coupling

Claim 1

An improved quick-connect coupling, the coupling comprising a socket having wall means forming three inner sections of stepped bore diameters, said coupling including a packing ring and at least one helically formed clamping ring adapted to be slideably mounted on the part to be connected to said coupling, said clamping ring having a relaxed inner diameter smaller than the outer diameter of the part to be connected to said coupling, a groove, the packing ring being positioned in said groove, in the intermediately sized bore portion of the socket section, positioning means for guiding the clamping ring into clamping position, the socket section having the smallest bore diameter including an internal thread for connecting the coupling with a connecting part, the improvement comprising at least one said clamping ring being positioned in the section having the largest bore diameter, the clamping ring having free ends which cross one over the other and then extend radially outwardly so as to project through said positioning means, said positioning means including trapezoid apertures located in the wall of the section having said largest bore diameter, said free ring ends being movable within the apertures, and said apertures narrowing in direction of the socket inlet end whereby when said ring is moved toward said inlet end said free ends will be moved further apart resulting in a decrease of the inner diameter of said ring.