Patent ID: 7503466

Claim:
A pump for fixing on a receptacle, the pump comprising: a stationary portion comprising a pump body; a moving assembly movable relative to the pump body and co-operating therewith to define a pump chamber of variable volume; at least one opening in the pump body that enables the pump chamber to communicate with an inside of the receptacle and is configured to enable the pump to operate in a head-down position; an air intake passage between the stationary portion and the moving assembly, said intake passage being distinct from said at least one opening; a first lip configured, after displacement of the moving assembly from a rest position in a substance-dispensing direction, to press in a leaktight manner against the pump body and to prevent communication via said at least one opening between the inside of the receptacle and the pump chamber; a second lip situated above the first lip, when the pump is observed in a head-up position, said second lip being configured, at least when the moving assembly is in an end-of-stroke position inside the pump body, to press in a leaktight manner against the pump body and to prevent communication via the inside of the pump body and said at least one opening between the inside of the receptacle and the outside; and an annular gasket for interposing between the stationary portion and a top end of a neck of the receptacle on which the pump is to be mounted, said annular gasket enabling ingress of air from outside toward the inside of the receptacle, while preventing a substance contained in the receptacle from flowing to said outside.