Patent ID: 7770759

Claim:
A liquid dispenser device for being associated with a liquid reservoir (R), said device comprising: a liquid dispenser orifice ( 25 ); and a pusher ( 2 ) that is axially displaceable down and up between a rest position and a depressed position; a chamber ( 10 ) provided with an inlet valve ( 5 , 15 ), an outlet valve ( 27 , 32 ), and a piston ( 3 ) that is suitable for varying the volume of the chamber ( 10 ), the outlet valve comprising a movable valve member ( 32 ) and a valve seat ( 27 ), the valve member being secured in displacement with the piston ( 3 ), the piston ( 3 ) including an elastically-deformable portion ( 31 ) that is deformed by the pusher ( 2 ) in its depressed position, in such a manner as to open the outlet valve, the pusher ( 2 ) forming the valve seat ( 27 ) of the outlet valve; the dispenser device being characterized in that it further comprises a body ( 1 ) for being mounted on an opening (C) of a reservoir (R), the body ( 1 ) forming a piston-receiving slide-cylinder ( 17 ) defining a free top edge ( 171 ), the piston ( 3 ) including a piston lip ( 36 ) in leaktight sliding contact in the piston-receiving cylinder ( 17 ), and an annular flange ( 31 ) that extends outwards above the top edge ( 171 ) of the cylinder ( 17 ), the valve member ( 32 ) being formed on the outer periphery of the annular flange ( 31 ), the elastically-deformable portion being formed by the annular flange ( 31 ), the pusher ( 2 ) coming to bear against the annular flange ( 31 ) when the flange is in abutment against the top edge ( 171 ) of the cylinder, thereby deforming the flange and opening the outlet valve.