Measuring and dispensing apparatus

Details Measuring and dispensing apparatus Measuring and dispensing apparatus

1977-09-19

1979-07-31

Scherbel, David A.

Dispensing

Floating piston with plural or alternate discharge

With discharge volume varying means

91275, G01F 1106, F01L 2508

Patent

active

041627504

ABSTRACT:
An apparatus for automatically dispensing a measured volume of liquid has a cylinder and a piston. The liquid is fed to one end of the cylinder and displaces the piston which expels from the other end of the cylinder a quantity of liquid proportional to the piston stroke. At the end of the stroke, the piston abuts and closes a switch which actuates an electric motor driving a four-way rotary valve to reverse the liquid flow direction in the cylinder, whereby the piston moves in the opposite direction to discharge a measured amount of the liquid which was previously used to push the piston. The piston, at the end of its second stroke, again strikes and causes the closing of a second electric switch which produces rotation of the four-way valve to again reverse the liquid flow to its original direction.

REFERENCES:
patent: 825370 (1906-07-01), Zurbuch
patent: 2074543 (1937-03-01), Feaster
patent: 2462571 (1949-02-01), Thompson et al.
patent: 2755966 (1956-07-01), Lindars
patent: 2945668 (1960-07-01), Staller et al.
patent: 3769881 (1973-11-01), Aoki
patent: 4031918 (1977-06-01), Cagle

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