Liquid feeding pump
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United States of America Patent
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Jul 28, 1998
Grant Date -
N/A
app pub date -
Dec 20, 1995
filing date -
Dec 21, 1994
priority date (Note) -
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Abstract
A liquid feeding pump includes two coaxial cylinder chambers, a piston mounted in each chamber, and a piston rod connecting the pistons. A head side of one cylinder chamber functions as a liquid chamber, a rod side functions as a first air chamber, a rod-side of the other cylinder chamber functions as a second air chamber, and a head side functions as a third air chamber. The liquid chamber is formed with liquid inlets or outlets. Each of the air chambers is formed with air inlets or outlets, a part of the supplying pipes connected to the liquid inlet or outlet of the liquid chamber is wound around an outer periphery of the other cylinder chamber, or a peripheral wall of the other cylinder chamber is formed with a liquid cooling chamber and supplying pipes communicated with and connected to the liquid inlets or outlets of the liquid chamber are connected to the liquid cooling chamber.
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