Gong mounting device for striking watch

1. Gong mounting device designed to bear against a crystal closing a striking-watch case, comprising

a block for immobilizing at least one end of a gong inside the watch case, and

a means for mounting this block on said crystal,

wherein the crystal comprises at least one opening and said mounting means is a clamping-type mounting means cooperating with said at least one opening and enabling the block to exert pressure on the crystal.

2. Mounting device according to claim 1 , wherein said clamping-type mounting means comprises a means for adjusting the clamping force applied between the block and the crystal.

3. Mounting device according to claim 2 , wherein the applied clamping force is produced by tightening a threaded member, or by rotating an eccentric, or by turning a lever arm.

4. Mounting device according to claim 2 , wherein the clamping-type mounting means comprises at least one first threaded member, which has a head facing the outer face of the crystal and which is designed to engage with a threaded portion housed in the block.

5. Mounting device according to claim 4 , wherein a first seal is arranged at an interface between the crystal and the head of the first threaded member.

6. Mounting device according to claim 4 , wherein the head bears against the crystal via a collar which increases the contact area on the outer face of the crystal in order to reduce the pressure exerted on the crystal.

7. Mounting device according to claim 6 , wherein a second seal is arranged at an interface between the crystal and the collar and in that the first seal is positioned at an interface between the collar and the head.

8. Mounting device according to claim 6 , wherein the head of the first threaded member has no recess.

9. Mounting device according to claim 4 , wherein the head of the first threaded member has no recess.

10. Mounting device according to claim 1 , wherein the applied clamping force is produced by tightening a threaded member, or by rotating an eccentric, or by turning a lever arm.

11. Mounting device according to claim 1 , wherein the clamping-type mounting means comprises at least one first threaded member, which has a head facing the outer face of the crystal and which is designed to engage with a threaded portion housed in the block.

12. Mounting device according to claim 11 , wherein a first seal is arranged at an interface between the crystal and the head of the first threaded member.

13. Mounting device according to claim 11 , wherein the head bears against the crystal via a collar which increases the contact area on the outer face of the crystal in order to reduce the pressure exerted on the crystal.

14. Mounting device according to claim 13 , wherein a second seal is arranged at an interface between the crystal and the collar and a first seal is positioned at an interface between the collar and the head.

15. Mounting device according to claim 11 , wherein the head of the first threaded member has no recess.

16. Mounting device according to claim 11 , wherein the first threaded member comprises a blind internal thread and a smooth outer surface.

17. Mounting device according to claim 11 , wherein the first threaded member has an external thread.

18. Mounting device according to claim 1 , which comprises a means for positioning the block on the crystal.

19. Mounting device according to claim 18 , wherein said positioning means consists of the engagement of the outer surface of a first threaded member in a bore formed in the block.

20. Mounting device according to claim 1 , wherein the opening is a circular opening.

21. Mounting device according to claim 1 , wherein the opening is a circular opening and the mounting means comprises a first threaded member, wherein the circular opening has a diameter greater than a diameter of the first threaded member in order to provide a clearance useful for positioning the block on the crystal.