Patent ID: 8413853

Claim:
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 ).