Watch with a tourbillon

1. Watch with a movement incorporating a tourbillon mechanism, characterised in that this tourbillon mechanism has only a single cage ( 13 , 18 , 22 ) holding a balance ( 15 ), this cage ( 13 , 18 , 22 ) rotating in only one direction about an axis (X—X) forming a constant angle with the plane of the movement of the watch, and in that the axis of rotation of the balance ( 15 ) forms an angle between 45° and 90° with the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ).

2. Watch according to claim 1 , characterised in that the axis of the balance ( 15 ) is essentially perpendicular to the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon.

3. Watch according to claim 1 , characterised in that the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon is parallel to the plane of the movement of the watch, while the angle which it forms with the plane of the movement is essentially zero.

4. Watch according to claim 1 , characterised in that the cage of the tourbillon ( 13 , 18 , 22 ) also holds pallets ( 19 ) and an escape wheel and pinion ( 20 , 21 ), and in that the escape pinion ( 21 ) is engaged with the teeth ( 8 ) of a fixed wheel ( 6 ).

5. Watch according to claim 4 , characterised in that the fixed wheel ( 6 ) is coaxial with the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon.

6. Watch according to claim 1 , characterised in that it includes a drive wheel and pinion ( 25 , 26 , 27 ) driven by the train of the watch movement; in that this drive wheel and pinion ( 25 , 26 , 27 ) is pivoted following an axis perpendicular to the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon; and in that this drive wheel and pinion ( 25 , 26 , 27 ) includes a drive wheel ( 25 ) the teeth ( 24 ) of which cooperate with a drive pinion ( 23 ) fixed to the axis ( 13 , 13 a , 13 b ) of the tourbillon cage.

7. Watch according to claim 1 , characterised in that the axis of rotation (X—X) of the cage of the tourbillon ( 13 , 18 , 22 ) forms an angle of 0 to 90° with a winding stem of the movement of the watch.

8. Watch according to claim 1 , characterised in that the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon forms an angle of 45° with a winding stem of the movement of the watch.

9. Watch, according to claim 1 , characterised in that it consists of a wrist watch.

10. Tourbillon mechanism for a watch according to claim 1 , including the single tourbillon cage ( 13 , 18 , 22 ) holding the balance ( 15 ) and an escape wheel and pinion ( 20 , 21 ), characterised in that the pinion ( 21 ) of the escape wheel and pinion is engaged with a fixed wheel ( 6 ).

11. Tourbillon mechanism according to claim 10 , characterised in that the fixed wheel ( 6 ) is coaxial with the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon.

12. Tourbillon mechanism according to claim 10 , characterised in that the axis (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon holds a drive pinion ( 23 ) engaged with the teeth ( 24 ) of a drive wheel ( 25 ) pivoted about an axis perpendicular to the axis (X—X) of rotation of the cage ( 13 , 18 , 22 ) of the tourbillon.

13. Tourbillon mechanism according to claim 10 , characterised in that the fixed wheel ( 6 ) and the drive wheel ( 25 ) in section exhibit the general shape of a bell.

14. Tourbillon mechanism according to claim 10 , characterised in that the fixed wheel ( 6 ) cooperates with the escape pinion ( 21 ) via conical teeth, and in that a drive wheel ( 25 ) cooperates with the drive pinion ( 23 ) via conical teeth.

15. Watch according to claim 2 , characterised in that the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon is parallel to the plane of the movement of the watch, while the angle which it forms with the plane of the movement is essentially zero.

16. Tourbillon mechanism according to claim 11 , characterised in that the axis (X—X) of the cage ( 13 , 18 , 22 ) of the tourbillon holds a drive pinion ( 23 ) engaged with the teeth ( 24 ) of a drive wheel ( 25 ) pivoted about an axis perpendicular to the axis (X—X) of rotation of the cage ( 13 , 18 , 22 ) of the tourbillon.

17. Tourbillon mechanism according to claim 11 , characterised in that the fixed wheel ( 6 ) and a drive wheel ( 25 ) in section exhibit the general shape of a bell.

18. Watch having a case with a movement incorporating a tourbillon mechanism, characterised in that this tourbillon mechanism has a single cage ( 13 , 18 , 22 ) holding a balance ( 15 ) and an escape wheel and pinion ( 20 , 21 ), this cage ( 13 , 18 , 22 ) rotating about an axis (X—X) forming a constant angle with the plane of the movement of the watch, and in that the axis of rotation of the balance ( 15 ) forms an angle between 450 and 900 with the axis of rotation (X—X) of the cage ( 13 , 18 , 22 ), wherein the escape pinion ( 21 ) directly engages with the teeth of a wheel ( 6 ), fixed relative to said case.