Positive displacement dispensing pump system

Pumps – Expansible chamber type – Pumping member position controlled port

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Details

417 53, F04B 706

Patent

active

059613033

ABSTRACT:
This disclosure describes a pump that dispenses controlled amounts of flowable material by computer controlling both the displacement and angular position of the piston with servomechanism means. The system includes container means to hold a supply of flowable product material to be dispensed; cylindrical piston and piston housing means having a plurality of inlet porting means adapted to receive said flowable product material from the container means, and a plurality output porting means adapted to dispense said product from said container; piston rod means connected to the piston means so as to impart linear and rotary motion to said piston means. Rotary and linear drive means are connected to the piston rod means and adapted to alternately cause surface apertures to align with the inlet porting means while causing surface lands to restrict flow from the outlet porting means, then cyclically reversing said process. A computer controls all aspects of the dispensing pump, including rate and volume of the recharge and discharge cycle, timing, opening size and rate of the opening and closing of the control valves. In its simplest form, the described pump requires only three parts to be in contact with the pumped ingredients.

REFERENCES:
patent: 1099155 (1914-06-01), Ahlborn
patent: 3168872 (1965-02-01), Pinkerton
patent: 3631818 (1972-01-01), Zito
patent: 4008003 (1977-02-01), Pinkerton
patent: 4479758 (1984-10-01), Herson et al.
patent: 4599049 (1986-07-01), Gordon et al.
patent: 4941809 (1990-07-01), Pinkerton
patent: 5015157 (1991-05-01), Pinkerton
patent: 5482448 (1996-01-01), Atwater et al.

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