Pumping system

Details Pumping system Pumping system

1987-07-28

1988-08-23

Rolla, Joseph J.

Dispensing

Automatic control

Of dispensers with fluid pressure discharge assistance

222135, 222145, 222389, 91171, B67D 542, F01B 2504

Patent

active

047655097

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 pneumatic 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 pneumatically driven piston or plunger to prevent one piston or plunger from moving faster or slower than the other piston or plunger.

REFERENCES:
patent: 3330444 (1967-07-01), Raypholtz
patent: 3752039 (1973-08-01), Hewins
patent: 4046288 (1977-09-01), Bergman
patent: 4136708 (1979-01-01), Cosentino et al.
patent: 4261481 (1981-04-01), Speer
patent: 4284210 (1981-08-01), Horak
patent: 4386716 (1983-06-01), Buck
patent: 4638925 (1987-01-01), Buchner et al.
patent: 4676410 (1987-06-01), von Flue
patent: 4690306 (1987-09-01), Staheli

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