Patent ID: 7243819
Filing Date: 2007-07-17
Classification: B05B

Abstract:
1. A simplified invertible pump for dispensing an atomized liquid, comprising a main body having an upper end and a lower end and defining a chamber within which a piston is sealedly slidable connected to a hollow stem emerging from the upper end of the main body, at the lower end of which there is provided a hole from which there extends a tubular appendix for supporting a dip tube connected to the pump via a unidirectional valve system which is open to enable liquid to arrive in said chamber through the dip tube when the pump is upright, but is closed when the pump is inverted, in the main body there being provided an aperture which is open and free, to enable liquid to arrive directly in the pump chamber when the pump is inverted and in the rest condition, but closes when the pump is operated and its piston moves away from the rest position, wherein said aperture is provided in the upper part of the main body in a position in which it is left free by said piston when the pump is at rest whereas it is closed by said piston when the piston withdraws from its rest position on operating the pump, said unidirectional valve system comprising two balls and a hollow profiled element projecting into said chamber from the lower end of the main body in correspondence with the hole provided at the lower end of the main body, and having two ends both profiled to form seats on which a respective ball can rest and form a seal, one of said balls being disposed within the pump chamber and the other being housed and movable between the hole provided at the lower end of the main body and the cavity of the tubular appendix said hollow profiled element comprising means for retaining the ball freely oscillable within the chamber in proximity to its seat.