Rotary displacement pump comprising scraper and guide of the...

Details Rotary displacement pump comprising scraper and guide of the... Rotary displacement pump comprising scraper and guide of the...

2005-09-16

2008-12-09

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Plural working chambers

Axially spaced working chambers

C418S152000, C418S179000, C418S219000

Reexamination Certificate

active

07462022

ABSTRACT:
A rotary displacement pump includes a stator (42) fixed in a housing (20), a rotor including a shaft portion (8), a radially protruding web (12), a scraper (110) having an engagement slot (112) engaging the protruding web (12). A guide (92) retains the scraper (110) in a circumferential direction and allows the scraper (110) to move reciprocatingly in a substantially axial direction. The scraper includes first, second and third grooves (120, 124and127). The grooves are designed so that they accommodate a portion of the guide (92) and allow the reciprocating movement of the scraper (110).

REFERENCES:
patent: 1509051 (1924-09-01), McBryde
patent: 1654883 (1928-01-01), Jaworowski
patent: 1690728 (1928-11-01), Jaworowski
patent: 2788748 (1957-04-01), Szczepanek
patent: 3156158 (1964-11-01), Pamplin
patent: 3194167 (1965-07-01), Wilson
patent: 3769945 (1973-11-01), Kahre
patent: 4575324 (1986-03-01), Sommer et al.
patent: 5980225 (1999-11-01), Sommer
patent: 4218385 (1993-11-01), None
International Search Report and Written Opinion for International Application No. PCT/EP2005/010006 mailed on Nov. 30, 2005.

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