Abstract: A mechanical connection for concrete reinforcing rods has a connecting sleeve and a reinforcing rods having protuberances (e.g., ribs or fins) on their outer surfaces. Each of the reinforcing rods has a threaded end for connection with the connecting sleeve, which has tapped portions for receiving the reinforcing rods. In one embodiment, a first end of a first reinforcing rod is passed completely through the sleeve, and the sleeve is then rotated about the end while simultaneously being screwed onto a second end of a second reinforcing rod. Upon tightening the connecting sleeve, the ends of the first and second reinforcing rods are placed in substantially coaxial, end-to-end arrangement, and are rotationally immobile. In a preferred embodiment, the connecting sleeve comprises a sheath having a conical bore, together with a conical socket in the form of two shell halves, which, when place together, provide two internal tapped portions having opposing threads.

Abstract: The invention relates to a method for producing mechanical joints of concrete-reinforcing rods, to a reinforcing rod allowing the application of the method as well as to a mechanical joint for reinforcing rods thus produced. It has its applications especially in the construction of concrete elements, buildings or structures.According to the invention, the method for producing the mechanical joints for the reinforcing rods which allow the joining of reinforcing rods, the extremities of which are threaded by screwed connecting sleeves, is characterized in that prior to the threading, the extremity of the rods to be joined is subjected to a cold upsetting procedure.