Drainage pump and underwater bearing unit

Rotary kinetic fluid motors or pumps – With lubricating – sealing – packing or bearing means having... – For shaft sealing – packing – lubricating or bearing means

Reexamination Certificate

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Details

C415S216100, C415S229000

Reexamination Certificate

active

07128523

ABSTRACT:
A drainage pump has a pump part in which blades mounted on a rotary shaft are arranged in a pump casing and an underwater bearing unit which uses pumped water mixed with hard particles as a lubricant and has a sliding bearing for journaling the rotary shaft. A portion of the rotary shaft journaled by the sliding bearing is formed of a cemented carbide material and a shaft journaling surface of the sliding bearing is formed of a thermoplastic resin material to be embedded with hard particles.

REFERENCES:
patent: 4664595 (1987-05-01), Tsuji et al.
patent: 5700093 (1997-12-01), Hiramatsu et al.
patent: 5792717 (1998-08-01), Takayama
patent: 6276898 (2001-08-01), Elliott
patent: 6406184 (2002-06-01), Orndorff et al.
patent: SHO 62-194919 (1986-06-01), None
patent: 06-147228 (1994-05-01), None
patent: 06-346887 (1994-12-01), None
patent: 10-252758 (1998-09-01), None
patent: 2002-147459 (2002-05-01), None

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