Pump with a pressure driving head

Details Pump with a pressure driving head Pump with a pressure driving head

2006-08-22

2009-12-29

Shaver, Kevin P (Department: 3754)

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

Reexamination Certificate

active

07637395

ABSTRACT:
A pump with a pressure driving head comprises a retaining tube; the retaining tube having a receiving space; liquid can flow therein; a returning element being installed in the receiving space; a movable tube received in the receiving space of the retaining tube; a head extending from a top of the movable tube; the head having an outlet which is communicated to the movable tube; when a pressure is applied to the head, the movable tube will move axially in the retaining tube; and an isolation device tightly adhered upon an inner wall of the receiving space of the retaining tube; an air isolation chamber being formed by the isolation device and the movable tube; with the pressing affect of the movable tube, a part of liquid in the retaining tube will be stored in the air isolation chamber so as to be formed with an air isolation layer.

REFERENCES:
patent: 4089442 (1978-05-01), Hafele et al.
patent: 4693675 (1987-09-01), Venus, Jr.
patent: 5176296 (1993-01-01), Lina et al.
patent: 5823394 (1998-10-01), Davis et al.
patent: 2004/0099694 (2004-05-01), Suzuki

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