Hydraulic plumber's friend

Details Hydraulic plumber's friend Hydraulic plumber's friend

2006-07-11

2006-07-11

Nguyen, Tuan (Department: 3751)

Baths, closets, sinks, and spittoons

Obstruction remover

Piston

C004S255010, C004S255110

Reexamination Certificate

active

07073211

ABSTRACT:
A hydraulic plumber's friend has a cylindrical body, a lid, a compression assembly, a tapered end cap and a nozzle assembly. The cylindrical body has an open bottom and holds water to be injected into a clogged pipe. The compression assembly has a drive shaft and a piston mounted slidably in the cylindrical body. The tapered end cap is mounted on the open bottom of the cylindrical body and has a transverse partition, a tapered body and a spout. The nozzle assembly has a valve having a cylindrical disk mounted slidably in the spout and having a closed top, an open bottom, a cylindrical sidewall and multiple charging holes, a valve stem and a spring. When the charging holes are uncovered, water flows. The nozzle is mounted on the cylindrical disk and seals and directs water into an opening in a clogged pipe.

REFERENCES:
patent: 3934280 (1976-01-01), Tancredi
patent: 4186451 (1980-02-01), Ruo
patent: 4847923 (1989-07-01), Huang
patent: 5199114 (1993-04-01), Christopher
patent: 5522094 (1996-06-01), Balazs
patent: 5823754 (1998-10-01), Lee
patent: 5927957 (1999-07-01), Kennedy et al.
patent: 6499151 (2002-12-01), Ollinger

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