Pumps – Motor driven – Fluid motor
Patent
1993-10-07
1995-07-04
Gluck, Richard E.
Pumps
Motor driven
Fluid motor
92 132, 92 137, F15B 1524
Patent
active
054294843
ABSTRACT:
A metallic diaphragm is provided within a pump chamber. This diaphragm is oscillated by a stem to Feed liquid medicine. The stem is provided with a plate and a movement of this plate, i.e., a stroke of the stem is limited by a pair of stoppers. Relative position of the paired stoppers at which they limit the stroke is adjusted by providing the paired stoppers with threads which are handed reversely to each other so that the paired stoppers are moved by amounts equal to each other during a change of the relative position. The stem carries thereon a piston which is, in turn, vertically movable within a cylinder chamber into which compressed air is introduced to oscillate the stem. A plurality of such pumps are successively connected one to another, stop valves are connected upstream as well as downstream off the respective pumps and a suck-back pump of the same construction as the liquid feed pump is connected immediately before a liquid filling device.
REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 1885436 (1932-11-01), Hampton
patent: 2803195 (1957-08-01), Lock
patent: 2948221 (1960-08-01), Carver
patent: 3354830 (1967-11-01), Mortara
patent: 4167896 (1979-09-01), Clements
patent: 4391291 (1983-07-01), Hume
Honda Washiro
Matsumoto Hisayoshi
Nakazawa Masahiko
Eisai Co. Ltd.
Gluck Richard E.
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