Member 1, rotating freely about fixed axis A of shaft 2, is rigidly secured to internal ratchet wheel a. Rigidly mounted on shaft 2 is member 3 having pawl 5 which turns about axis B. Pawl 5 is actuated by spring 4. Upon clockwise rotation of member 1, member 3 and shaft 2 rotate together with member 1. Upon reversal of rotation, members 1 and 3 are disengaged.
$456$SL,C$