Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1997-11-18
1999-10-05
Freay, Charles G.
Pumps
Expansible chamber type
Pumping member position controlled port
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.
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patent: 5482448 (1996-01-01), Atwater et al.
Carroll Leo R.
Evora Robert Z.
Freay Charles G.
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