Appeal No. 2001-0735 Page 7
Application No. 09/135,390
and then introduced into the suction ports of the piston. The
fluid introduced into the closed casing is not directly
introduced into the pressure chamber, but guided to the
integral passage of the hollow main shaft, and it is caused to
pass through the hollow main shaft in the axial direction to
cool it, thereby it prevents the temperature of the hollow main
shaft itself from increasing. The fluid having passed through
the hollow main shaft is then guided around the electromagnetic
circuit arranged on the outer periphery of the hollow main
shaft and cools the electromagnetic circuit to suppress its
temperature increase, and thereafter it is guided into the
pressure chamber to be compressed and discharged as in the
conventional electromagnetic reciprocating pump.
Osada teaches (column 8, lines 2-10) that
[t]he direction of the fluid flow in the pump may be
reversed. That is, it is possible that the directions of
the suction valves, discharge valve and the like are
reversed, and the fluid is sucked from the closed tank
51B (in this case, not closed) and the pressurized fluid
is discharged from the air introducing chamber 51A (in
this case, it should be closed). This has an advantage
that the pulsation of the pressurized fluid is smoothed
by the resistance of the fluid passage 5A.
Osada further teaches (column 8, lines 30-40) that
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