The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1991
Filed:
Sep. 05, 1989
Joseph R Hartt, Englewood, CO (US);
Other;
Abstract
A hydraulic pump provides two different fluid pressure outputs from a single input. The pump includes a first double acting piston and cylinder having a pair of inlets on opposite sides of the first piston and a pair of outlets on the opposite sides of the first piston. A second double acting piston and cylinder are provided which cylinder has a pair of inlets on opposite sides of the second piston and a pair of outlets on opposite sides of the second piston. A common piston rod interconnects the pistons and means is provided for alternately supplying fluid to the first inlets of the first and second cylinders on one side of the pistons and then to the first inlets on the other side of the first and second pistons to cause the first and second pistons to reciprocate within the first and second cylinders, respectively. In this manner, the first piston discharges fluid through an outlet on the opposite side of the first piston from the inlet through which the fluid enters to provide high pressure pulsating fluid flow from the outlets of the first cylinder and the second piston discharges fluid through an outlet of the opposite side of the second piston from the inlet through which the fluid enters to provide low pressure pulsating fluid flow from the output of the second cylinder.