Patent ID: 8056770

Claim:
Pump intended to be mounted on a bottle so as to enable a liquid contained in said bottle to be dispensed, said pump including: a pump body intended to be rigidly connected to the bottle while able to be brought into communication with the liquid; an atomizer secured to a push button so as to be activated in translatory motion in said body, said atomizer including a dispensing path including at least one upstream orifice and a channel whereof the downstream end is in communication with a dispensing nozzle; a means for the elastic return of the translatory motion of said atomizer in said body; a plunger mounted in frictional contact against the internal surface of said body so as to define a dosing chamber which is in communication with the liquid by means of a clack valve, said plunger being arranged so as to offer a state where the upstream orifices are blocked and a state where the upstream orifices are brought into communication with the dosing chamber; said pump being characterised in that the plunger is mounted coaxially around the atomizer in an association zone, said association zone being arranged so as to enable sealed swiveling between the plunger and the atomizer; wherein said association zone includes a projection for centering and sealing the plunger around the atomizer and an annular space enabling angular deflection of said atomizer relative to said plunger; wherein said plunger includes an upper and a lower sealing lip, wherein each of said upper and said lower sealing lip are in frictional contact with an internal surface of said pump body, said upper sealing lip extending from an opposite side of said plunger than said lower sealing lip relative to a direction of translatory motion of said plunger; wherein the association zone is arranged so as to enable a relative sliding of the plunger around the atomizer between the state where it is blocked and the state where it is brought into communication, said sliding being constrained by elastic pre-tensioning means mounted in support between the plunger and the atomizer; wherein the pre-tensioning means is a spring; wherein the return means is a spring having a diameter larger than a diameter of the pre-tensioning means and the return means is placed concentrically around the pre-tensioning means; characterised in that it additionally includes an expander secured to the body, the plunger being slidably mounted in the expander, the return means being supported on the outside of a lower bearing surface of the expander; characterised in that it additionally includes an upper shroud which is interposed between the atomizer and the push button; and characterised in that the shroud includes a lower skirt which has an external diameter that enables said skirt to slide without play in the expander when the atomizer is moved in translatory motion.