Pumps – Changeable by assembly or disassembly – For reverse drive or flow
Patent
1995-06-28
1996-02-06
Bertsch, Richard A.
Pumps
Changeable by assembly or disassembly
For reverse drive or flow
417442, F04B 3710, F04B 3914
Patent
active
054891965
ABSTRACT:
A manual pump includes first, second and third tubular members, and a restraining ring member. The first tubular member has a piston which is mounted movably in the first tubular member. The second tubular member has an upper open end which is fixed sealingly to a lower open end of the first tubular member. The second tubular member further has a first side wall that has first inflow and outflow check valves, and a lower closed end that has second inflow and outflow check valves and a first opening. The third tubular member has a top open end, a bottom constricted end, and a partition. A second opening is formed in a second side wall of the third tubular member. A third opening is formed in the partition. The second side wall has an external thread that is formed near the top open end of the third tubular member. The second tubular member is inserted rotatably into the third tubular member. The restraining ring member has an internal thread that engages the external thread of the third tubular member so that the second tubular member can be prevented from disengaging from the third tubular member but can permit the third tubular member to rotate in the third tubular member.
REFERENCES:
patent: 4728260 (1988-01-01), Ishii
patent: 5071325 (1991-12-01), Tupper
patent: 5156538 (1992-10-01), Lee
Bertsch Richard A.
Wicker William
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