High pressure plunger

Details High pressure plunger High pressure plunger

2007-05-08

2007-05-08

Huynh, Khoa D. (Department: 3751)

Baths, closets, sinks, and spittoons

Obstruction remover

Connected to a source of external fluid under pressure

C004S255040, C004S255080, C004S255010

Reexamination Certificate

active

11152047

ABSTRACT:
A plunger includes a lever, a pipe, a rod passed through an axial hole of the pipe, a covering member, and a spring; the rod will be upwards displaced when the lever is pivoted upwards; the rod has a passage therein, and a head at an upper end for connection with an air pump; the covering member has a neck, and an outlet on a lower side; the pipe is inserted in the neck; two airtight rings are secured on an inner side of the neck; the rod is normally biased to a lowermost position by the spring; the lower end of the rod will block the outlet, and the passage will communicate with inside of the covering member when the rod is in lowermost position; when the lever is pivoted upwards, high-pressure air will escape through the outlet to push a blockage in a drain tube of a sink.

REFERENCES:
patent: 357717 (1887-02-01), Lawless
patent: 446283 (1891-02-01), Danaher
patent: 477808 (1892-06-01), Lawless
patent: 1734206 (1929-11-01), Fisch
patent: 1994526 (1935-03-01), McCloskey
patent: 5524296 (1996-06-01), Leighton
patent: 6032301 (2000-03-01), Wang
patent: 6393625 (2002-05-01), Tsai
patent: 6775857 (2004-08-01), Hughes et al.
patent: 6922854 (2005-08-01), Allenbaugh et al.
patent: 7073211 (2006-07-01), Wu

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