Patent ID: 6053364
Filing Date: 2000-04-25
Classification: B05B

Abstract:
Device for dispensing an air-liquid mixture, comprising:a liquid container andan operating unit, said operating unit including:an air pumpa liquid pump, each said pumps being concentric, and each said pumps including a piston chamber and a piston displaceable therein, each said pumps comprise an inlet and a discharge,an operating component for operating said two pumps, said operating component being integral with the piston of the liquid pump, and therein defining an outflow channel having a dispensing opening, said channel connectable to said discharge of said pumps, andair pump shut-off means for sucking up air into the piston chamber of said air pump and to dispense air to the outflow channel, said air pump shut-off means present in the inlet and discharge of the air pump,liquid pump shut-off means for sucking up liquid into the piston chamber of said liquid pump an to dispense liquid to the outflow channel, said liquid pump shut-off means present in the inlet and discharge of the liquid pump,the connection between the outflow channel and the air pump being interrupted while air is being sucked up,the connection between the outflow channel and the liquid pump being interrupted liquid is being sucked up, andthe air pump comprises a double-acting shut-off device, said shut-off device shuts off both the inlet of air to the air pump and shuts off the discharge of air therefrom, said double-acting shut-off operable actively by the operating component, said air piston movable freely over a short distance with respect to the operating component.