Patent ID: 7740151
Filing Date: 2010-06-22
Classification: B05B,F04B,F04F,Y10T

Abstract:
1. Apparatus for dispensing liquid comprising a dispenser bottle having a dispensing opening therein; a flexible bladder mounted in the dispenser bottle and forming an annular space therewith, the bladder having a bladder opening therein and being connected to dispenser bottle by connecting the two openings together, the bladder being fillable with a liquid to be dispensed, a discharge tube having an inlet end and an outlet end, the discharge tube having an inlet opening at the inlet end thereof and positioned within the bladder in spaced relation with the bladder opening, the discharge tube being connected at its outlet end to the bladder and the dispenser bottle at their openings, the discharge tube having a discharge opening at its outlet end in communication with the openings in the bottle and bladder; and means for exerting a fluid pressure in the annular space to force the bladder to collapse and thereby force liquid within the bladder into the inlet opening of the discharge tube and thence out of the discharge opening of the discharge tube and the opening in the bottle; and said means for exerting a fluid pressure in the annular space provided with means for automatically equalizing pressure between outside atmosphere and said annular space without allowing air to enter into the bladder thereby preventing accidental discharge of liquid from the discharge tube due to changes in temperature or atmospheric pressure and preventing contamination of the fluid located within the bladder.