초록 ▼

An accumulative pressure pump that has upper and lower pressure chambers of different diameters, each of which is provided with a piston having a connected stem. Inlet and outlet check valves are provided. The outlet valve opens on accumulation of pressure on the downward stroke of the two pistons.

An accumulative pressure pump that has upper and lower pressure chambers of different diameters, each of which is provided with a piston having a connected stem. Inlet and outlet check valves are provided. The outlet valve opens on accumulation of pressure on the downward stroke of the two pistons. The lower portion of the inner sidewall of the lower chamber is provided with a rib or a recess to permit any air trapped in the two chambers to be expelled through a bottom opening that is provided in the lower chamber. The dip tube is connected directly to the second piston and has its end abutting or adjacent the bottom of the container and is reciprocal with the second piston whereby its lower end moves into the lowermost portion of the container to permit substantial removal of the entire contents of the container.

대표청구항 ▼

In a pump dispenser adapted to be attached to a container holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump body having a first section and a second section, said second section being of a smaller diameter than said first section; (b) a first piston

In a pump dispenser adapted to be attached to a container holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump body having a first section and a second section, said second section being of a smaller diameter than said first section; (b) a first piston received in said first body section and having an attached first stem means having a fluid passage therein extending out of said body section; (c) a second piston received in said second body section and having an attached second stem means having a fluid passage in its lower portion and a solid upper portion normally contacting said first stem means to close the fluid passage therein; (d) a dip tube means having its upper portion passing through an opening of larger diameter than said dip tube that is provided in the lower end of said second body section, the dip tube upper end being coupled to said second piston and movable therewith; and (e) means provided on the wall of said second body section to cooperate with said second piston to permit air entrapped in said first and second body sections to be discharged through the opening in the lower end of said second body section into the air space of said container upon the priming of the pump.