Patent ID: 7547136

Claim:
An oscillating weight mechanism having an axis of rotation, mounted on a drive arbour for automatic winding of a spring or for driving a generator, the mechanism comprising: (a) primary oscillating weight secured to the drive arbour; and (b) at least one secondary oscillating weight that is mobile relative to the primary weight to give initial impulse to the oscillating weight mechanism; wherein the secondary weight is formed by a part exterior to the primary weight and is able to travel along a path concentric to the axis of rotation of the oscillating weight mechanism and between two stop members attached to a guide means, wherein the guide means is located on a periphery of the primary weight and is attached thereto, wherein the primary weight comprises an armature formed by a ring for securing to the drive arbor, and two radial arms extending to a felloe, wherein the felloe forms the guide means for the secondary weight, wherein the secondary weight comprises two elements disposed on either side of the felloe, and wherein ends of the radial arms form the stop members.