Length-adjustable control rod

A control rod comprising:

• a first part and a second part, each of the first part and the second part comprising a fixing head;
• the first part comprising a cylinder, coaxial to a longitudinal axis, which has a peripheral face;
• the second part comprising a barrel, coaxial to the longitudinal axis when the first part and the second part are assembled, which has an outer lateral face, an inner lateral face configured to at least partially receive the cylinder of the first part and having an inner diameter substantially equal to a diameter of the peripheral face of the first part and an annular end rim linking the inner and outer lateral faces;
• the peripheral face of the first part comprising a succession of peripheral grooves, separated from one another by notches, positioned in transverse planes and which each extend over all of a circumference of the first part,
• the barrel comprising several cutouts configured to divide up the barrel into several cylinder sectors between the cutouts and at least one inner rib, protruding from the inner lateral face, which has a section configured to be housed in one of the peripheral grooves of the first party;
• the barrel being configured to occupy a first state, in which the cylinder sectors are pressed against the peripheral face of the first part and in which the inner rib is housed in one of the peripheral grooves, and an elastically deformed second state, in which the inner rib is positioned outside of the peripheral grooves;
• and
• a first locking system configured to hold the barrel in the first state, the first locking system comprising a ring configured to occupy a first position, in which the ring is fitted around the barrel and holds it in the first state, and a second position, in which the ring is withdrawn from the barrel.