Pumps – Expansible chamber type – Bellows-type chamber
Reexamination Certificate
2008-05-20
2008-05-20
Kramer, Devon C. (Department: 3746)
Pumps
Expansible chamber type
Bellows-type chamber
C417S443000, C417S481000
Reexamination Certificate
active
10834669
ABSTRACT:
A suction passage (1) and a discharge passage (2) for a to-be-transferred fluid are disposed in a pump body (3). A bottomed cylindrical bellows (6) is integrally coupled to the axial rear side of the pump body to form a closed space (7). The suction passage (1) has an upstream portion (1A) having a larger diameter and a predetermined passage cross section area, and downstream portions (1B) which are formed by branching the upstream portion into a bifurcated or Y-shape while reducing the passage cross section area. Two first small check valves (15) of the spring type in each of which the pressure receiving area is reduced in accordance with the reduced passage cross section areas of the smaller-diameter downstream portions (1B) are attached respectively to outlet portions of the smaller-diameter down-stream portions (1B) so as to be arranged in parallel. The outlets of the first check valves (15) are opened in the closed space (7).
REFERENCES:
patent: 1896237 (1933-02-01), Huff
patent: 2367893 (1945-01-01), Sheen
patent: 4253524 (1981-03-01), Erickson
patent: 4483665 (1984-11-01), Hauser
patent: 431753 (1991-06-01), None
patent: 1096147 (2001-05-01), None
patent: 1132668 (2001-09-01), None
patent: 1154157 (2001-11-01), None
patent: 05269062 (1993-10-01), None
patent: 11324926 (1999-11-01), None
patent: 2000 213465 (2000-08-01), None
patent: 95/23924 (1995-09-01), None
Hamo Patrick
Kramer Devon C.
Nippon Pillar Packing Co. Ltd.
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