High pressure fluid pump
AssigneeHydro-Pac, Inc.
InventorsWalter W. Robertson, Walter W. Robertson, Jr.
Life of this patent
Estimating the term…
Abstract
A free piston compressor for gases and liquids in which the positive pressure of the incoming fluid holds the piston against the piston rod during the intake stroke. In a specific form, the cylinder head is a plug of larger diameter than the piston which can be unscrewed to permit removal and replacement of the piston for service.
Claims6
A compressor comprising a cylinder having a head at one end and a seal at the other end, a piston rod having one end extending into the cylinder through said seal, means for reciprocating the rod toward and away from the head, a free piston in the cylinder not connected to the rod but in position to be engaged by the rod, a port through the head for fluid under pressure, and means for connecting said port to a fluid inlet under positive pressure when said piston rod is moving away from the head so the said pressure forces the piston to move with the piston rod as the cylinder is filled with said fluid and for connecting said port to a high pressure outlet when said piston rod is moving back toward said head.
Dependencies are inferred from the claim text.