Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1996-03-01
1998-04-21
Thorpe, Timothy
Pumps
Expansible chamber type
Pumping member position controlled port
417498, 417500, F04B 704
Patent
active
057411263
ABSTRACT:
A valveless positive displacement pump with a closed end cylinder has fluid inlet and outlet ports adjacent to the closed end. A piston is reciprocally and rotatively driven in the cylinder. The piston is provided with crisscrossed helical slots formed thereon which communicate specifically with the inlet and outlet ports for pumping fluid through the positive displacement pump. The piston is rotated by a drive shaft connected to a motor and reciprocated by an cam actuator mechanism cooperating with the drive shaft.
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401-95 Fluid Metering, Inc. catalog entitled Valveless Metering Pumps Jan. 1995.
Stearns Stanley D.
Werner Paul
Thorpe Timothy
Tyler Cheryl J.
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