Patent ID: 6390338
Filing Date: 2002-05-21
Classification: B05B

Abstract:
A pump for fitting to a receptacle, the pump comprising a pump body and a moving assembly that is movable relative to the body, the assembly having a piston that bears in leakproof manner against the body and that co-operates therewith to define a pump chamber of variable volume, the pump also including outside the pump chamber an elastically deformable membrane arranged to return the moving assembly into its initial position after delivering a quantity of substance, wherein the moving assembly comprises a rod possessing an internal passage for delivering the substance contained in the pump chamber, the internal passage opening out into the pump chamber via at least one orifice, and wherein the piston is movable relative to the rod between a pre-compression position in which it closes said outlet orifice(s) and a delivery position in which it releases said orifice(s), the piston being moved from its pre-compression position to its delivery position under the effect of the pressure of substance inside the pump chamber.