Push-button mechanism and timepiece fitted with such mechanisms

A push-button mechanism for activating a mechanical or electric function including first and second members which are mobile in relation to each other in planes parallel to a plane support to form return means and to produce a clicking under the action of a force F exerted by means of the push-button, wherein the first member is formed by a lever which pivots via one of its ends on a stud attached to the plane support, said lever including two other pins arranged in a triangle with respect to the stud, and the second member of generally elongated shape includes a substantially U shaped cut-out portion delimiting a base connecting first and second arms, said base including guide means intended to slide along a guide ramp attached to the plate and at least one control means for a function to be activated, the first arm of said second member being rigid and having its free end rotatably mounted on a first pin of the lever and the second arm being flexible while having at its free end a notch against which the second pin of the lever rests in the inactive position, said notch being extended by a beak shaped tip having an external edge oriented towards the exterior of the U shaped cut-out portion, against which the second pin of the lever slides when a force F is exerted on the rigid arm via the push-button by compressing the flexible arm and producing a clicking by passing from one position to the other.