Mounting and dismounting of a pump with respect to the reservoir

1. A unit for dispensing a fluid product, comprising:

a reservoir for packaging the product, consisting of a body surmounted by a neck defining an upper opening;

a system for dispensing the product;

a device for fixing the dispensing system to the reservoir;

said fixing device consisting of one single part having:

securing means on the neck of the reservoir actuated by an axial translational movement;

disconnection means with respect to the neck of the reservoir actuated by a rotational movement;

the neck of the reservoir comprising at least one radial projection, and having an annular edge around the upper opening, the fixing device comprising a skirt having an annular ring, corresponding to said securing means engaging with said annular edge of the neck for the snap-fitting of the fixing device on the neck of the reservoir,

wherein the skirt also has at least one ramp, corresponding to said disconnection means, engaging with said radial projection to unscrew the fixing device with respect to the neck of the reservoir.

2. The dispensing unit according to claim 1 , wherein the dispensing system comprises a dispensing pump mounted in the reservoir.

3. The dispensing unit according to claim 1 , wherein the axial translational movement leads to a snap-fitting of the fixing device on the neck of the reservoir.

4. The dispensing unit according to claim 1 , wherein the rotational movement leads to an unscrewing of the fixing device with respect to the neck of the reservoir.

5. The dispensing unit according to claim 1 , wherein the fixing device comprises a central funnel inside which is inserted said dispensing system, said funnel extending inside the skirt.

6. The dispensing unit according to claim 1 , wherein the fixing device comprises means for indexing the position thereof with respect to the reservoir.

7. The dispensing unit according to claim 6 , wherein said indexing means consist of at least one slide provided on the fixing device, wherein is inserted the radial projection of the neck of the reservoir during the securing.

8. The dispensing unit according to claim 7 , wherein said slide is delimited by two side walls, extending in an axial direction over a length such that the radial projection is always located between the two side walls when the fixing device is snap-fitted in the neck 4 of the reservoir.

9. The dispensing unit according to claim 1 , wherein the ramp is V-shaped.

10. The dispensing unit according to claim 1 , wherein the ramp has an edge against which the radial projection slides, this edge being chamfered.

11. The dispensing unit according to claim 10 , wherein the radial projection 5 has a contact zone with the edge of the ramp, said contact zone being bevelled.

12. The dispensing unit according to claim 1 , wherein the fixing device consists of a single moulded part.

13. A method for mounting and dismounting a dispensing system with respect to a reservoir for packaging fluid product using a dispensing unit, the method comprising:

fastening the dispensing system to a fixing device for fixing the dispensing system to a reservoir for packaging the product, the dispensing system comprising:

the reservoir consisting of a body surmounted by a neck defining an upper opening;

a system for dispensing the product;

said fixing device consisting of one single part having:

securing means on the neck of the reservoir actuated by an axial translational movement;

disconnection means with respect to the neck of the reservoir actuated by a rotational movement;

the neck of the reservoir comprising at least one radial projection, and having an annular edge around the upper opening, the fixing device comprising a skirt having an annular ring, corresponding to said securing means engaging with said annular edge of the neck for the snap-fitting of the fixing device on the neck of the reservoir,

wherein the skirt also has at least one ramp, corresponding to said disconnection means, engaging with said radial projection to unscrew the fixing device with respect to the neck of the reservoir;

carrying out an axial translation of the fixing device towards the neck of the reservoir until the snap-fitting of the fixing device with the neck of the reservoir;

carrying out a rotation of the fixing device with respect to the reservoir such that the radial projection slides over the ramp and drives an axial translation movement of the fixing device by moving it away from the neck of the reservoir, until the unlatching of the fixing device with the neck of the reservoir.