Abstract: Striking mechanism unit for a repeater striking mechanism, including a drive plate with a pipe pivoting about an axis and carrying a hook provided with a beak, a detent ratchet pivoting about the axis carrying a pin which is in abutment, through a hole in the plate, on the hook against a spring for the operation thereof when the detent ratchet is pivoting, and depending on the position thereof, the beak allows or prevents the pivoting of a pipe ratchet of a downstream stage which pivots integrally with a first hour ratchet. The downstream stage includes a second hour ratchet which pivots about the axis and whose toothing is inclined in the same direction as that of the first hour ratchet.

Abstract: Striking mechanism unit (2) for a repeater striking mechanism (100), including a drive plate (3) with a pipe (4) pivoting about an axis (D) and carrying a hook (6) provided with a beak (6A), a detent ratchet (9) pivoting about said axis (D) carrying a pin (8) which is in abutment, through a hole (3A) in said plate (3), on said hook (6) against a spring (7) for the operation thereof when said detent ratchet (9) is pivoting, and depending on the position thereof, said beak (6A) allows or prevents the pivoting of a pipe ratchet (11) of a downstream stage (1) which pivots integrally with a first hour ratchet (13). Said downstream stage (1) includes a second hour ratchet (15) which pivots about said axis (D) and whose toothing is inclined in the same direction as that of said first hour ratchet (13).

Abstract: In order to make a wheel-shaped balance (1) lighter, while maintaining sufficient mechanical resistance and good dimensional stability as regards temperature variations, the felloe (3) and the arms (2) of the balance are made of titanium or a titanium-based alloy. This enables a sprung balance oscillator to be made with a larger diameter than normal for the same frequency, or having a higher frequency with the same dimensions as a usual oscillator.