Fluid product dispenser

1. A fluid product dispenser comprising:

a fluid product reservoir (R) having a neck ( 1 ) internally defining an axial opening ( 10 ) oriented upward and communicating with the inside of the reservoir (R), the neck ( 1 ) externally defining at least one horizontal latching shoulder ( 121 ) oriented downward,

a dispensing head (T) mounted axially on the neck ( 1 ) of the reservoir (R), the head (T) comprising a dispensing member (P), and a fastening ring (F) engaging both the neck ( 1 ) of the reservoir (R) and the dispensing member (P), the fastening ring (F) comprising a skirt ( 2 ) forming at on an internal face of the skirt at least one internal latching projection ( 21 ) which is received below said at least one horizontal latching shoulder ( 121 ),

wherein said at least one horizontal latching shoulder ( 121 ) is formed at an oval base ( 11 ) of the neck ( 1 ) which forms an oval outer wall ( 110 ) with a horizontal cross-section of generally oval shape, except at said at least one horizontal latching shoulder ( 121 ).

2. The dispenser according to claim 1 , wherein the skirt has a horizontal cross-section of generally oval shape, such that the skirt ( 2 ) substantially surrounds, without gap, the oval base ( 11 ) of the neck with said at least one internal latching projection ( 21 ) engaged below said at least one horizontal latching shoulder ( 121 ).

3. The dispenser according to claim 1 , wherein the oval base ( 11 ) forms at least one release ramp ( 122 ), the latching projection ( 21 ), initially in latching engagement below the horizontal latching shoulder ( 121 ), being radially constrained outward on the release ramp ( 122 ) by rotation of the skirt ( 2 ) around the oval base ( 11 ) of the neck ( 1 ), thus releasing the latching projection ( 21 ) from its latching engagement from below the latching shoulder ( 121 ).

4. The dispenser according to claim 3 , wherein the release ramp ( 122 ) connects two neck zones which are radially offset and located axially at the same level, namely a bottom zone ( 123 ) located axially below said at least one horizontal latching shoulder ( 121 ) and the oval outer wall ( 110 ).

5. The dispenser according to claim 3 , wherein the oval base ( 11 ) forms at least one latching recess ( 12 ) which extends into the cavity from the oval outer wall ( 110 ), this latching recess ( 12 ) forming horizontal latching shoulder ( 123 ), the bottom zone ( 123 ) and at least one release ramp ( 122 ).

6. The dispenser according to claim 1 , wherein the oval base ( 11 ) defines two high curvature parts ( 11 a ) and two low curvature parts ( 11 b ), and the skirt ( 2 ) defines two high curvature sectors ( 2 a ) and two low curvature sectors ( 2 b ), said at least one horizontal latching shoulder ( 121 ) being located at at least one low curvature part ( 11 b ), and said at least one internal latching projection ( 21 ) being located at at least one low curvature sector ( 11 b ).

7. The dispenser according to claim 1 , wherein the oval base ( 11 ) forms at least one radial expansion ramp ( 113 ) located axially above said at least one horizontal latching shoulder ( 121 ) to elastically deform the skirt ( 2 ) such that said at least one internal latching projection ( 21 ) can be engaged by elastic loosening below said at least one horizontal latching shoulder ( 121 ).

8. The dispenser according to claim 1 , wherein the neck ( 1 ) comprises a circular cylindrical funnel ( 13 ) which extends axially upward from the oval base ( 11 ), this circular cylindrical funnel ( 13 ) having two supports ( 14 ) disposed diametrically opposite, each support forming an angular indexing ramp ( 141 ) which extends radially outward by connecting the circular cylindrical funnel ( 13 ) to the oval outer wall ( 11 ).

9. The dispenser according to claim 1 , wherein the fastening ring (F) comprises an annular flange (Fg) from which the skirt ( 2 ) extends downward, the skirt ( 2 ) defining two high curvature sectors ( 2 a ) and two low curvature sectors ( 2 b ), the two low curvature sectors ( 2 b ) being separated from the annular flange (Fg) by horizontal slots ( 22 ) to confer a radial deformation capacity to the two low curvature sectors ( 2 b ).

10. The dispenser according to claim 1 , wherein the fastening ring (F) comprises a circular cylindrical mounting socket (Ff) which extends upward from an annular flange (Fg), this mounting socket (Fg) overhanging the skirt ( 2 ), a trim band ( 3 ) being engaged with friction around the mounting socket (Ff), this trim band ( 3 ) surrounding, at a radial distance, the skirt ( 2 ) and advantageously coming into contact with an annular plate (R 1 ).

11. The dispenser according to claim 1 , wherein:

the oval outer wall ( 110 ) defines two horizontal bars ( 112 ) disposed diametrically opposite the low curvature parts ( 11 b ), each horizontal bar ( 112 ) comprising axially below it, a latching recess ( 12 ) and axially above it, a radial expansion ramp ( 113 ), a horizontal latching shoulder ( 121 ) being defined at the junction of the latching recess ( 12 ) and of the horizontal bar ( 112 ),

the skirt ( 2 ) defines two low curvature sectors ( 2 b ) disposed diametrically opposite and each forming an internal latching projection ( 21 ), a horizontal slot ( 22 ) being formed axially above each low curvature sector ( 2 b ).

12. The dispenser according to claim 1 , wherein: the dispensing member is a pump or a valve.