CLOCK MECHANISM DRUM WITH REDUCED CORE DIAMETER Russian patent published in 2015 - IPC G04B1/16 

FIELD: physics.

SUBSTANCE: drum unit (1) of a clock mechanism, which includes a main spring (2) mounted between the drum (3) and the receiving surface (5) of the core coaxial to the drum (3) relative to the axis (D). The core (4) includes, arranged in series from the first end (86) to the second end (87): means of fixing a ratchet (12) and/or a first shoulder (181) in a plate, a shoulder (43) of the hinge of the drum (3), a rim (40), which protrudes in the radial direction relative to the shoulder (43) and rests on the inner surface (31) of the drum (3) on the side of the spring (2), a receiving surface (5) which is displaced backwards in the radial direction relative to the rim (40), a shoulder (44) of the hinge of the cover (7) for closing the drum (1), the shoulder being displaced backwards relative to the receiving surface (5), a second shoulder (182) of the hinge in the plate.

EFFECT: higher energy storage of the main spring.

18 cl, 14 dwg