Manually operable invertible pump for dispensing atomized liquids

1. A manually operable invertible pump for dispensing an atomized liquid comprising a main body defining a chamber for the intake and compression of determined quantities of the liquid to be dispensed, a dip tube connected to said chamber via a hole provided in the base wall of the main body and via a first unidirectional valve system which enables the liquid to arrive in said chamber through the dip tube when the pump is upright but prevents liquid arrival when the pump is inverted, there being provided in the main body an aperture provided with a second unidirectional valve system which enables the liquid to directly arrive in the compression chamber when the pump is inverted but prevents this arrival when the pump is upright, wherein said second valve system comprises a cup-shaped body sealedly mounted on the outer peripheral surface of the main body to define with the adjacent extremity on the said main body an annular chamber housing and retaining a flexible element which when the pump is at rest or being used in the upright position is elastically urged to seal against a profiled edge provided on the base wall of the cup-shaped body, said annular chamber being in direct communication with said intake and compression chamber via said aperture provided in the main body, in the base of the cup-shaped body here being provided a first hole to which said dip tube is connected and a second hole which is open and in direct communication with said aperture of the chamber when the pump is inverted and is operated to draw liquid into the chamber of the main body, the flexible element having a central hole which enables said chamber to sealedly communicate with the dip tube through the first valve system.

2. An invertible pump as claimed in claim 1 , wherein said first unidirectional valve system consists of a hollow elongate element projecting from one and the other side of the base wall of the main body at said hole provided in said base wall, in correspondence with each of the two ends of said hollow elongate element there being provided a housing which contains and retains a ball movable between a position in which it rests on and seals against a profiled seat provided in said housing and a position in which it has moved away from said profiled seat to free the adjacent end of the cavity of the hollow elongate element, the cavity of that end of the elongate element being connected to the cavity of one end of the dip tube.

3. An invertible pump as claimed in claim 2 , wherein said hollow elongate element comprises a tubular element projecting from one and the other side of said central hole of the flexible element, the two free ends of said tubular element facing said ball and said ball respectively.

4. An invertible pump as claimed in claim 1 , wherein from said first hole provided in the base wall of the cup-shaped body there projects a hollow appendix which is closed by an end wall and on which an end of said dip tube can be sealedly mounted to feed the liquid to be dispensed to said chamber through said first unidirectional valve system, there being provided on the outer surface of said hollow appendix at least one groove extending from the closed end of the hollow appendix to an aperture provided in the said hollow appendix and connecting the cavity of said appendix to said groove, said aperture being provided in said appendix in an intermediate position along its length.