Inertial mass equipped with a flexible inertial element, particularly for horology
An inertial mass ( 1 ) intended to be mounted on a regulating organ ( 10 ), particularly of a horological movement, the inertial mass being configured to be subjected to a rotary oscillation movement at a predetermined frequency, the inertial mass including a rigid main body ( 2 ), characterised in that it comprises a flexible inertial element ( 3 ) assembled with the main body ( 2 ), the flexible inertial element ( 3 ) being configured to modify the geometry of the inertial mass ( 1 ) according to the oscillation amplitude. Also, a regulating organ and a horological movement comprising such an inertial mass.
1. An inertial mass ( 1 ) intended to be mounted on a regulating organ ( 10 ), a horological movement, the inertial mass being configured to be subjected to a rotary oscillation movement at a predetermined frequency, the inertial mass including a rigid main body ( 2 ), wherein the inertial mass comprises at least one flexible inertial element ( 3 ) assembled with the main body ( 2 ), the flexible inertial element ( 3 ) being configured to modify the geometry of the inertial mass ( 1 ) according to the oscillation amplitude, and
wherein the flexible inertial element ( 3 ) is arranged radially inwards of the main body ( 2 ).
2. The inertial mass according to claim 1 , further comprising means for adjusting the position of the flexible inertial element ( 3 ) with respect to the main body ( 2 ).
3. The inertial mass according to claim 2 , wherein the adjustment means are configured to apply a variable force or torque on the flexible inertial element ( 3 ).
4. The inertial mass according to claim 3 , further comprising a second flexible inertial element ( 13 ) arranged by rotational symmetry of the inertial element ( 3 ), the adjustment means being configured to adjust the position of the second flexible inertial element ( 3 ) with respect to the main body ( 2 ).
5. The inertial mass according to claim 2 , wherein the adjustment means comprise a longitudinal adjustable screw ( 8 , 18 ), the screw being configured to bear against the flexible inertial element ( 3 , 13 ).
6. The inertial mass according to claim 5 , wherein the screw ( 8 , 18 ) is arranged to bear against the rigid portion ( 6 , 16 ).
7. The inertial mass according to claim 1 , wherein the flexible inertial element ( 3 , 13 ) comprises a flexible part and a rigid inertia-block ( 4 , 14 ), the flexible part connecting the inertia-block ( 4 , 14 ) to the main body ( 2 ).
8. The inertial mass according to claim 7 , wherein the flexible part comprises a first flexible strip ( 5 , 15 ) connected by one end to the inertia-block ( 4 , 14 ).
9. The inertial mass according to claim 8 , wherein the flexible part comprises a rigid portion ( 6 , 16 ) connected to the other end of the first flexible strip ( 5 , 15 ), and further comprises a second flexible strip connecting the rigid portion ( 6 , 16 ) to the main body ( 2 ) by the ends thereof.
10. The inertial mass according to claim 1 , wherein the main body ( 2 ) is an annular balance, the flexible inertial element(s) ( 3 , 13 ) being arranged inside the annular balance.
11. The inertial mass according to claim 1 , wherein the inertial mass extends substantially in the same plane.
12. The inertial mass according to claim 1 , further comprising two additional inertia-blocks, arranged on the main body ( 2 ), the second additional inertia-block ( 9 , 19 ) having an adjustable position for modifying the inertia of the inertial mass.
13. A regulating organ for a horological movement, comprising an elastic return element, comprising an inertial mass ( 1 ) according to claim 1 .
14. The regulating organ according to claim 13 , wherein the elastic return element is a balance-spring ( 25 ), wherein the frequency is 3 Hz.
15. The regulating organ according to claim 13 , wherein the elastic return element is a flexible guidance, wherein the frequency is at least 10 Hz.
16. A horological movement, comprising a regulating organ according to claim 13 .
17. The inertial mass according to claim 1 , wherein the flexible inertial element ( 3 ) is entirely arranged radially inwards of the main body ( 2 ).
18. The inertial mass according to claim 1 ,
wherein the flexible inertial element ( 3 ) comprises an inertia-block ( 4 ), a first flexible strip ( 5 ), a rigid portion ( 6 ), and a second flexible strip ( 7 ), and
wherein the inertia-block ( 4 ) is arranged at a first longitudinal end of the first flexible strip ( 5 ),
wherein the rigid portion ( 6 ) is arranged at a second longitudinal end, opposite of the first longitudinal end, of the first flexible strip ( 5 ), and
wherein, partway along a length of the rigid portion ( 6 ) from the second longitudinal end of the first flexible strip ( 5 ) to an end of the rigid portion ( 6 ) furthest away from the inertia-block ( 4 ), the rigid portion ( 6 ) is attached to the main body ( 2 ) by the second flexible strip ( 7 ).
19. The inertial mass according to claim 18 ,
wherein the first flexible strip ( 5 ) and the inertia-block ( 4 ) are cantilevered away from the rigid portion ( 6 ).
20. An inertial mass ( 1 ) intended to be mounted on a regulating organ ( 10 ), of a horological movement, the inertial mass being configured to be subjected to a rotary oscillation movement at a predetermined frequency, the inertial mass including a rigid main body ( 2 ), wherein the inertial mass comprises at least one flexible inertial element ( 3 ) assembled with the main body ( 2 ), the flexible inertial element ( 3 ) being configured to modify the geometry of the inertial mass ( 1 ) according to the oscillation amplitude,
wherein the flexible inertial element ( 3 , 13 ) comprises a flexible part and a rigid inertia-block ( 4 , 14 ), the flexible part connecting the inertia-block ( 4 , 14 ) to the main body ( 2 ),
wherein the flexible part comprises a first flexible strip ( 5 , 15 ) connected by one end to the inertia-block ( 4 , 14 ), and
wherein the flexible part comprises a rigid portion ( 6 , 16 ) connected to the other end of the first flexible strip ( 5 , 15 ), and further comprises a second flexible strip connecting the rigid portion ( 6 , 16 ) to the main body ( 2 ) by the ends thereof.