A clockwise torque is applied by weight 10 to disk 9 which rotates about fixed axis A. Pawl 2 is connected through gears 5, 6, 7 and 8 to planet pinion 3 which meshes with fixed sun gear 4. Disk 9 is the carrier of the planetary gearing consisting of pinion 3 and gear 4. Spiral spring 11 is attached to gear 4 and link 1 which carries pin a. Pin a engages link 12 which has braking surface b on its pivot. Spring 13 holds pin c of link 12 against cam 14 which is rigidly attached to pinion 3. Spiral spring 11 turns link 1 which, in turn, turns link 12 and releases pawl 2. At this disk 9 is turned by weight 10. Pinion 3 rolls around gear 4 and makes one revolution about its axis after which pawl 2 again brakes the mechanism. At this, spring 11 is wound up because link 1 is stopped at the initial instant of rotation of disk 9 by a mechanism which is not shown.
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