Patent ID: 6161732
Filing Date: 2000-12-19
Classification: B05B

Abstract:
A push-button for dispensing pressurized fluid substances comprising a main body having a chamber bounded by an at least partly cylindrical lateral wall and closed at one end by a profiled member in which a discharge nozzle for the pressurized fluid is formed, an at least partly cylindrical elongate body extending into said chamber and from which there projects an appendix the free end of which is positioned in front of said nozzle, a piston housed in and movable within said chamber and having at least one lip sealedly slidable along the cylindrical surface of said chamber, elastic means acting on said piston to maintain said appendix and said nozzle urged towards each other to sealedly close the nozzle when in its rest state, in the main body there being provided a seat for housing a free end of a stem of a pump for delivering a pressurized liquid, this seat being in open communication with said chamber at a point such that pressurized liquid arriving in the chamber acts on said piston in an opposite direction to that in which said elastic means operate, characterised in that said elastic means consist of flexible fins projecting from the profiled member in which said nozzle is formed, and having their free ends abutting against said main body, from said profiled member there projecting a tubular sleeve with which an adjacent end of said piston sealedly engages the fins tending to maintain the profiled member and, via tubular sleeve, with it the piston urged in the rest state, said elongate body being integral with said main body, said piston having at least a second lip sealedly slidable along the cylindrical surface of the elongate body, the surface of said elongate body being shaped in proximity to its appendix in such a manner as to prevent the second piston lip sealing against it and allow pressurized fluid to pass from said chamber to said nozzle.