A torque is applied by weight Q to disk 5 which rotates about fixed axis A. One end of flat spring 4 is attached to disk 5 and the other end actuates pawl 2 which is connected by turning pair B to disk 5. Through pawl 2 and pin a, spring 4 turns link 1. At this pawl 2 is withdrawn from engagement with a tooth of fixed ratchet wheel 3 and disk 5 turns from the action of weight Q until pawl 2, bearing against pin a of link 1, which is stopped by a special mechanism (not shown), engages the next tooth of ratchet wheel 3. As disk 5 turns, spring 4 is tensioned and the whole process is repeated.
$2715$RG,ML$