Steel rod straining device

Claim 1

A steel reinforcing rod device comprising a pair of strain applying members, each strain applying member being comprised of an elongated flat steel plate having a keyhole shaped opening at one end thereof and an elongated slot extending from a position adjacent said keyhole opening toward the other end of said elongated plate, said other end of said plate being bent in a semi-cylindrical shape and being provided with screw threads, a corresponding semi-cylindrically shaped member having screw threads thereon positioned adjacent said semi-cylindrical portion of said plate and being riveted thereto thereby forminG a tubular member having an internal screw thread, the tubular member on one of said strain applying members having a right handed screw thread and the tubular member on the other of said strain applying members having a left handed screw thread, a steel rod extending between said strain applying members, one end of said rod having right handed threads thereon and being threaded into said right handed threaded tubular member on said one of said strain applying members and the other end of said rod having left handed threads thereon and being threaded into the left handed threaded tubular member on said other of said strain applying members, said ends of said rod extending through said tubular members into said elongated slots, and a flat portion positioned at an intermediate portion of said steel rod and adapted to be engaged with a tool for turning said rod.