Pushbutton device for controlling the start/stop and resetting functions of a chronograph mechanism

A pusher device for controlling the start/stop and zero-reset functions of a chronograph mechanism from outside a watch case, comprising a case middle whose main face is traversed by a central opening for receiving a timepiece movement and which has two lateral guide openings, the axes of which are parallel to the plane of the central opening and through which two control pushers are mounted so that they can slide between two limit positions, elastic return means tending constantly to maintain these pushers in their outer limit positions with respect to said central opening, corresponding to their rest positions, and a control rocker mounted on the lateral face of the case middle and hinged about a pin perpendicular to the plane of said central opening and remote from a pusher which is kinematically linked to this rocker between said two limit positions, characterized in that the control rocker is situated between the pushers, the latter, when in the outer limit position, being simultaneously in contact with the control rocker while maintaining it in a mid-position between its rocking limit positions which respectively correspond to the movement of the pushers into their inner limit positions.