Hydraulic puller apparatus for attaching a coupling to a hose

Claim 1

In combination, apparatus for attaching a hydraulic coupling assembly to a hose, said assembly comprising a body having a cylindrical chamber and an end wall for telescoping over an end of a hose, a tubular coupling member for extending through an opening in the end wall of the body, the inner end of said member being formed with an enlarged expansion head dimensioned to be freely telescoped into the bore of the hose, and a tubular pressure element mounted on said coupling member and dimensioned for free telescoping movement into the bore of the hose and having an inner end portion of deformable material, said inner end portion being initially positioned adjacent said head and the other end abutting the end wall of the body; said apparatus comprising detachable connector means securable to opposite ends of said coupling member, and a puller operably connectible to said means for moving said coupling member axially outward with respect to said body, said head including a tapered wedging surface engaging said deformable end portion of the pressure element for radially expanding the same outwardly into permanent radial locking engagement with the inside surface of said hose upon relative axial displacement between said pressure element and said tubular element when said puller is operated, said radial expansion of said pressure element into said hose firmly squeezing said hose outwardly against the cylindrical wall of the chamber of said body, said expansion head including a second, oppositely tapered, wedging surface engaged by the deformed end portion of said pressure element for transmitting pullout thrust applied to said coupling member to said body end wall and hose in contact with said pressure element.