Patent ID: 7083325

Claim:
A control mechanism for timepiece of the type comprising a frame ( 10 ) furnished with two parallel faces defining a reference plane, one of which is intended to support a dial and the other is opposite the back, and, secured to this frame: a control rod ( 12 ) furnished with an annular groove ( 14 ) having a width l, an external diameter D and an internal diameter d, mounted so as to move in translation on the frame ( 10 ) along a first axis (AA′) included in said plane, and a retaining plate ( 20 ) mounted, on the back side, on the frame ( 10 ) parallel to said plane and comprising a locking piece ( 22 ) mounted so as to rotate about a second axis (BB′) perpendicular to the reference plane and arranged such that it is capable of occupying: a first position, called the locking position, in which the translation movement of said rod ( 12 ) is limited by the engagement of the locking piece ( 22 ) in the groove ( 14 ), and a second position, called the unlocking position, in which said locking piece ( 22 ) is no longer engaged in the groove ( 14 ) thus allowing the rod ( 12 ) to be pushed in on the frame ( 10 ) or pulled out, characterized in that said locking piece ( 22 ) comprises: a first part ( 26 ) of general cylindrical form, engaged in the retaining plate ( 20 ) in order to allow its rotation on the plate; a second part ( 34 ) disposed on the side opposite to the rod ( 12 ) and arranged to allow said locking piece ( 22 ) to rotate, and a third part ( 38 ), disposed on the side of the rod ( 12 ), intended to interact with it and comprising, for this purpose, two wings ( 40 ) inscribed in a dummy cylinder of the same axis as the second axis (BB′) and of slightly smaller diameter than the width l of the groove ( 14 ), said wings being arranged such that, in the locking position, the wings ( 40 ) are at least partly inscribed in the space between the external diameter D of the groove ( 14 ) and the internal diameter d and, in the unlocking position, the wings ( 40 ) take on the contour of the external diameter D.