Fastening device for sealing a fluid product reservoir

1. A fastener device for closing a fluid reservoir that is formed with a neck that is provided with outer peripheral reinforcement that co-operates with the remainder of the neck to define a bottom shoulder, said fastener device comprising:

a fastener ring for holding a closure member on the neck, the fastener ring including a peripheral skirt that extends around the neck to below the bottom shoulder, said skirt being provided with fastener elements that each form a contact zone configured to engage the neck below the bottom shoulder, depending on an axial position of the respective contact zone relative to the bottom shoulder, so as to fasten the ring on the neck; and

a blocking hoop that is engaged around the peripheral skirt in a final mounted position, so as to block at least some of the fastener elements below the bottom shoulder;

wherein the peripheral skirt forms vertical blades, at least some of which are separated by axial slots, the blocking hoop forming vertical branches that are arranged in the axial slots in the final mounted position; and

wherein the blocking hoop comprises a top disk that is connected to a bottom blocking collar via at least two of the vertical branches.

2. The fastener device according to claim 1 , wherein the fastener elements extend downwards below the vertical blades and are set back towards an inside, such that the blocking collar is received below the blades, in alignment therewith, in bearing contact with the fastener elements, in the final mounted position.

3. The fastener device according to claim 1 , wherein the blocking collar is elastically deformable.

4. A fastener device for closing a fluid reservoir that is formed with a neck that is provided with outer peripheral reinforcement that co-operates with the remainder of the neck to define a bottom shoulder, said fastener device comprising:

a fastener ring for holding a closure member on the neck, the fastener ring including a peripheral skirt that extends around the neck to below the bottom shoulder, said skirt being provided with fastener elements that each form a contact zone configured to engage the neck below the bottom shoulder, depending on an axial position of the respective contact zone relative to the bottom shoulder, so as to fasten the ring on the neck; and

a blocking hoop that is engaged around the peripheral skirt in a final mounted position, so as to block at least some of the fastener elements below the bottom shoulder;

wherein the peripheral skirt forms vertical blades, at least some of which are separated by axial slots, the blocking hoop forming vertical branches that are arranged in the axial slots in the final mounted position; and

wherein the axial slots extend over an entire height of the skirt, such that the branches extend in the axial slots without creating extra thickness at the skirt.

5. The fastener device according to claim 1 , wherein the blocking hoop forms a blocking collar that is held temporarily on the skirt of the fastener ring in a pre-mounted position, before being moved axially into its final mounted position.

6. The fastener device according to claim 1 , wherein some vertical blades are interconnected at bottom ends of the vertical blades via spacers that support the fastener elements, a pair of vertical blades thus forming between them a window above the respective spacer.

7. The fastener device according to claim 1 , wherein the contact zones are situated at different axial heights, such that some contact zones come into operating engagement below the bottom shoulder, while other contact zones remain inoperative.

8. The fastener device according to claim 7 , wherein the fastener elements are radially movable, so as to pass over the outer reinforcement of the neck and come into engagement below the bottom shoulder.

9. The fastener device according to claim 1 , wherein the fastener elements comprise tabs that extend freely downwards, the tabs forming inwardly- and upwardly-directed rims that define contact zones of different axial heights.

10. A fluid reservoir including a neck that is provided with the fastener device according to claim 1 , for holding a closure member on the neck.

11. The fastener device according to claim 4 , wherein the blocking hoop forms a blocking collar that is held temporarily on the skirt of the fastener ring in a pre-mounted position, before being moved axially into its final mounted position.

12. The fastener device according to claim 4 , wherein some vertical blades are interconnected at bottom ends of the vertical blades via spacers that support the fastener elements, a pair of vertical blades thus forming between them a window above the respective spacer.

13. The fastener device according to claim 4 , wherein the contact zones are situated at different axial heights, such that some contact zones come into operating engagement below the bottom shoulder, while other contact zones remain inoperative.

14. The fastener device according to claim 13 , wherein the fastener elements are radially movable, so as to pass over the outer reinforcement of the neck and come into engagement below the bottom shoulder.

15. The fastener device according to claim 4 , wherein the fastener elements comprise tabs that extend freely downwards, the tabs forming inwardly and upwardly directed rims that define contact zones of different axial heights.

16. A fluid reservoir including a neck that is provided with the fastener device according to claim 4 , for holding a closure member on the neck.