Patent ID: 6926438

Claim:
Chronograph mechanism, of the type comprising: a chronograph train ( 22 ) for carrying at least one hand for the display of a measured time, a going train, a coupling wheel ( 14 ) capable of occupying two positions and for connecting the chronograph train to the going train in one of such positions, a coupling member ( 16 ) for ensuring the movement of the coupling wheel, between its first position in which the mechanism is operating, and its second position in which the mechanism is not operating, a cam ( 24 ) for cooperating with the coupling member ( 16 ) for defining the first and second positions of the coupling wheel ( 14 ), a control lever ( 26 ) fitted with a control member ( 28 ) activating the cam ( 24 ) and, via said cam, the coupling member ( 16 ) to make the coupling wheel pass from one position to the other, characterized in that said lever ( 26 ) includes a locking member ( 36 ) and the coupling member ( 16 ) is fitted with a catch ( 20 ) cooperating with said locking member when the coupling wheel ( 14 ) occupies its first position, such that the coupling member ( 16 ) is prevented from moving via the effect of a shock when the coupling wheel is meshed with the chronograph train.