Attachment device and dispenser using such a device

1. A fastener device for fastening a dispenser member ( 4 ) on a neck ( 11 ) of a fluid reservoir ( 1 ) so as to constitute a fluid dispenser, the device comprising:

a fastener ring ( 2 ) including both reception means ( 21 ) for receiving the dispenser member ( 4 ), and fastener means ( 23 ) for coming into engagement around the neck ( 11 ) of the reservoir ( 1 ); and

a blocking hoop ( 3 ) that is engaged around the ring ( 2 ) and that is movable axially relative to the ring between a provisional pre-assembled position and an final assembled position, the fastener means ( 23 ) of the ring being free to move radially outwards in the provisional pre-assembled position so as to make it possible to assemble the ring on the reservoir neck, the hoop ( 3 ) being engaged around the fastener means ( 23 ) of the ring so as to block them around the neck ( 11 ) in the final assembled position;

the fastener device being characterized in that the hoop ( 3 ) includes a clearance section ( 32 ) that, in the provisional pre-assembled position, is disposed around the fastener means ( 23 ), but with an intermediate clearance gap (E) separating them, so as to enable the fastener means ( 23 ) to move radially outwards without being hindered by the hoop ( 3 ), and is offset axially in the final assembled position relative to the fastener means ( 23 ), so as to enable the hoop to block the ring ( 2 ) on the neck ( 11 ).

2. The fastener device according to claim 1 , wherein the ring ( 2 ) is inscribed entirely within the hoop ( 3 ) in the provisional pre-assembled position, the clearance section ( 32 ) masking the fastener means ( 23 ).

3. The fastener device according to claim 1 , wherein the clearance section ( 32 ) presents a bottom end edge ( 33 ) that extends axially at least up to the same level as a bottom end of the ring ( 2 ).

4. The fastener device according to claim 1 , wherein the clearance section ( 32 ) is connected to a blocking section ( 34 ) that comes to be engaged around the fastener means ( 23 ) in the final assembled position.

5. The fastener device according to claim 4 , wherein the clearance section ( 32 ) presents a thinner wall relative to the blocking section ( 34 ).

6. The fastener device according to claim 4 , wherein the blocking section ( 34 ) and the clearance section ( 32 ) are connected together forming an internal shoulder ( 35 ) that is situated axially above the fastener means ( 23 ) in the provisional position, and below the fastener means ( 23 ) in the final position.

7. The fastener device according to claim 1 , wherein the fastener means include a skirt ( 22 ) that forms at least one fastener profile ( 23 ) that projects radially inwards.

8. The fastener device according to claim 1 , wherein the blocking hoop ( 3 ) is surrounded by a covering hoop ( 36 ) that is advantageously formed integrally with the blocking hoop.

9. The fastener device according to claim 1 , wherein the dispenser member is a pump or a valve.

10. A fluid dispenser comprising:

a fluid reservoir ( 1 ) having a neck ( 11 ) that projects from a reservoir body, the neck forming an external annular reinforcement ( 12 );

a dispenser member ( 4 ); and

a fastener device ( 2 , 3 ) according to claim 1 , the fastener means ( 23 ) coming to be engaged below the annular reinforcement ( 12 ) of the neck ( 11 ).

11. The dispenser according to claim 10 , wherein the clearance section ( 32 ) comes into abutment against the reservoir ( 1 ) in the final assembled position.

12. The dispenser according to claim 9 , wherein the dispenser member is a pump or a valve.