Horological assembly for a regulating member provided with rate adjustment means

A horological assembly for a horological regulating member, said horological assembly (10) comprising;

• a balance spring (25) including a flexible strip (2) wound about itself in a plurality of turns, the strip (2) having a predefined rigidity and adjusting means for adjusting its rigidity, the adjustment means comprising a flexible element (5) arranged in series with the strip (2), the flexible element (5) connecting one end (4, 9) of said strip (2) to a rigid support (17), the flexible element (5) preferably having a rigidity greater than that of the strip (2), the adjustment means further comprising prestressing means (6) for applying a variable force or torque to the flexible element (5), so as to vary the rigidity of the flexible element (5);
• and
• a stud-holder (1) configured to suspend the balance spring (25), the stud-holder (1) comprising a main body (30) connected to the flexible element (5), and a secondary body (33) connected to the prestressing means (6), the secondary body (33) being movable relative to the main body (30), wherein the secondary body (33) is connected to the main body (30) by a flexure bearing (20).