Two-torque-producing connecting rod assembly

A two-torque-producing connecting rod assembly comprising:

• a rod being polygonal in cross section and including a first section and a second section which is smaller in diameter than the first section, the first section being provided at one end thereof with a connecting portion;
• a connecting member being a hollow cylindrical structure sleeved on the rod and having an inserting cavity at one end thereof and a stepped receiving cavity at another end thereof;
• the receiving cavity including an outer section, an inner section and a middle section connected between the outer and inner section, the middle section having a diameter smaller than a diameter of the outer section but larger than a diameter of the inner section, an inner surface of the outer section being formed by plural alternatively-arranged arc-shaped concave portions and alternatively-arranged pointed convex portions;
• the rod has the first section fitted in the outer section and has the second section inserted in the middle section, and an end of the second section is inserted in the inner section of the connecting member;
• each of the pointed convex portions being formed by two planar surfaces;
• each of the arc-shaped concave portions having two ends connected to neighboring pointed convex portions, and a middle point between the two ends, one of the two ends of each of the arc-shaped concave portions, a center of the outer section, and the middle point of each of the arc-shaped concave portions define an angle ranging from 8-30 degrees, when the first section of the rod is inserted in the outer section of the connecting member, plural angles of the first section are disposed between the two ends of the arc-shaped concave portions and restricted to move between the two ends by the pointed convex portions;
• a gripping member is formed with a cylindrical cavity, and the another end of the connecting member formed with the receiving cavity is received in the cylindrical cavity, at a bottom of the cylindrical cavity is formed a through hole for insertion of the first section of the rod.