Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1986-10-02
1987-10-20
Freeh, William L.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
417403, 417426, F04B 1700, F04B 3500
Patent
active
047011122
ABSTRACT:
A multiple fluid pumping system uses two or more fluid pumps each driven by a pneumatic piston or plunger and cylinder combination whose piston top stroke and bottom stroke positions are detected by reed switches in combination with a magnet attached to the piston. The top stroke reed switches are connected in series with one side of a two position pneumatic solenoid valve while the bottom stroke reed switches are connected in series with the other side of a two position penumatic solenoid valve. The circuit is designed to prevent one of the pistons from changing the direction of its stroke prior to the other piston reaching the end of its stroke. A further embodiment utilizes a magnet mounted on one pneumatically driven piston or plunger and a pair of reed switches mounted on the other penumatically driven piston or plunger to prevent one piston or plunger from moving faster or slover than the other piston or plunger.
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Eisenhut Wolfgang O.
Senf John W.
Adhesive Engineering Company
Freeh William L.
Tipton Robert R.
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