초록 ▼

A manually actuated upright/inverted pump sprayer having a piston controlled container vent path, an auxiliary liquid intake port for inverted spray being spaced closer to the inner side of the container seal gasket compared to the spacing of the container vent port therefrom so as to preclude the s

A manually actuated upright/inverted pump sprayer having a piston controlled container vent path, an auxiliary liquid intake port for inverted spray being spaced closer to the inner side of the container seal gasket compared to the spacing of the container vent port therefrom so as to preclude the spontaneous ingestion of air bubbles from the open vent path into the pump chamber through such intake port during inverted spray.

대표청구항 ▼

A manually operated dispenser comprising: a pump housing including a pump cylinder; a manually operated piston reciprocably movable within said cylinder so as to define a pump chamber having a variable volume, said piston having a suction stroke when reciprocably moving in one direction such that sa

A manually operated dispenser comprising: a pump housing including a pump cylinder; a manually operated piston reciprocably movable within said cylinder so as to define a pump chamber having a variable volume, said piston having a suction stroke when reciprocably moving in one direction such that said volume of said pump chamber increases and having a pressure stroke when reciprocably moving in a direction opposite to said one direction; a valve controlled inlet passage leading to said pump chamber; a closure cap in engagement with said housing for mounting said cylinder on a container of liquid to be dispensed, said piston having a stem extending outwardly through a central opening in said cap, said stem having a valve controlled discharge passage; a sealing gasket within said cap for sealing against a mouth of the container, said gasket having an underside facing toward a container of liquid to be dispensed when said cylinder is mounted on the container; means for equalizing a pressure within the container when said cylinder is mounted on the container and including a closable container vent path formed between said piston and said closure cap, said piston and said closure cap being arranged relative to each other so that said container vent path opens and closes by said piston reciprocably moving respectively away from and into contact with said closure cap so that the pressure within the container equalizes when said container vent path is open; auxiliary valve means associated with said pump chamber and including an intake port through which the liquid is suctioned into said pump chamber when the container is in an inverted position, said intake port being spaced a predetermined distance from said underside of said gasket; and only one air vent port terminating said vent path, said air vent port being spaced from said underside of said gasket at a distance greater than said predetermined distance so that in the inverted position of the container air enters through said air vent port during said suction stroke of said piston and is prevented from entering said pump chamber through said intake port, said piston and said cylinder being arranged in a liquid-tight abutment against one another so that said piston seals off said container vent path from said pump chamber at all times to thereby prevent the liquid from entering the container vent path during said pressure and suction strokes of said piston, said container vent path being free of any additional valve means.