Bracelet clasp comprising a device for adjusting the useful length of the bracelet

A clasp for a bracelet of the type comprising first and second free ends, wherein the clasp comprises:

• first and second bracelet fastening members configured to be made respectively integral with said first and second free ends of the bracelet, wherein the first and second bracelet fastening members are movable in relation to one another between at least one open position and a closed wearing position, in which the first and second bracelet fastening members are closer to one another than in the open position, to close the bracelet and define a useful length therefore;
• at least one locking member arranged to hold the first and second bracelet fastening members in the closed position thereof;
• at least one control member for the locking member, wherein the control member is arranged to unlock the clasp in response to an action of a user and to change from said closed position to said open position;
• an adjusting device for adjusting the useful length of the bracelet comprising:
• an adjusting member carrying said first bracelet fastening member, and
• at least one lock capable of having a default closed state, in which the adjusting member is fixed, and an open state, in which the adjusting member is free to slide in the direction of the length of the bracelet with respect to the second bracelet fastening member to modify the useful length of the bracelet,
• wherein the adjusting device is distinct from the locking member, and the lock is arranged to change from the closed state to the open state thereof by action of the user on the control member of the locking member such that the adjusting member is capable of being shifted independently of the open or closed state of the clasp,
• wherein the control member comprises a push-piece capable of being displaced in a substantially perpendicular direction to the longitudinal direction of the bracelet in response to an action of the user, wherein the push-piece is independent of the lock.