Patent ID: 7597471

Claim:
A clockwork movement with chronograph function to for time measuring comprising: a going train, at least one second counter comprising a chronograph second mobile designed to support an organ for analog display of the second of the measured time, a control lever designed to be actuated by a first control member to alternatively activate or deactivate a time measurement, coupling means for connecting or not connecting said second mobile to said going train in response to an action on said control lever, selective locking means to lock said second counter in response to an action on said control lever, return-to-zero means for said second counter comprising at least one mobile return-to-zero element designed to be moved by a second control organ, at least between a first, locked position, and a second, active position, said mobile return-to-zero element being configured to act on said second counter in said second position, wherein it also comprises elastic means at least indirectly exerting a return force on said return-to-zero means, the movements of said mobile return-to-zero element being controlled exclusively by said second control member, from said locked position toward said active position, and by said elastic means, from said active position toward said locked position, and wherein said control lever is able to be actuated while said mobile return-to-zero element is in said active position, such that the driving of said second counter only effectively starts in response to a release of said mobile return-to-zero element from said active position.