Abstract: A coupling fitting for making joints in reinforcing bars or wires for structural concrete aims to provide a mechanical strength of the coupling virtually equal to the full design strength while providing the ability to increase the strength upto and beyond ultimate tensile strength of the rebar by the addition of resin. To that end the coupling comprises a sleeve for fitting in spaced relation around adjacent portions of rebars to be joined and having positively adjustable engagers threaded through the wall of the sleeve, and profiled engagers to engage said portions. The engagers serve for centering the rebars and the profiling serves to provide a key preferably with both the sleeve and the rebar. It is also preferred to have the positively adjustable engagers configured to bite into the rebars. The spaced relation affords provision for introducing settable resin.

Abstract: The disclosure relates to a reinforcing bar coupling system wherein reinforcing bars or wire are coupled for structural concrete by applying to adjacent rod or wire portions a material, e.g. epoxy resin settable to form a structurally sound joint. The material is applied by injection into a sleeve surrounding the adjacent wire portions.