Connecting rod equipped with ball joints capable of adjusting the distance between the centers

A connecting rod comprising:

• first and second ball joints made of ball-shanks and holders tiltably connected with said ball-shanks and a connecting portion which connects said holders of said first and second ball joints and is capable of adjusting the distance between the centers of said ball-shanks, wherein said connecting portion is comprised of first and second connecting arms molded integrally with said holders of said first and second ball joints by die casting and on which a plurality of positioning teeth which are capable of meshing with each other are respectively arranged in a longitudinal direction, and fixing means which makes said first and second connecting arms engaged with each other in a condition such that said positioning teeth of said first and second connecting arms are meshed with each other,
• wherein a distance between a center of said first and second ball joints is adjustable,
• wherein said positioning teeth formed on said first and second connecting arms are formed in a herring bone shape.