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:
Jan. 02, 1979
Filed:
Nov. 09, 1976
Gunnar Grotness, Fort Wayne, IN (US);
Peter W Boyer, Fort Wayne, IN (US);
PHD, Inc., Fort Wayne, IN (US);
Abstract
A fluid power system including a fluid power cylinder having a piston and fluid ports at its opposite ends, a directional valve for selecting the direction of piston actuation, and a metering control valve coupled between the directional valve and the cylinder. The control valve includes a cylinder section having a control piston therein and a valve body connected to the cylinder section and having a valve spool-receiving cavity therein. The valve body has first and second fluid ports therein communicating with the cavity, one of the valve body ports being coupled to one of the power cylinder ports and the other being coupled to the directional valve. A valve spool is disposed in the valve body cavity operatively connected to the control piston and movable therewith, the spool having a passage therein. The spool passage communicates with the valve body ports and provides unrestricted fluid flow therebetween in a first spool position and substantially restricts fluid flow between the valve body ports in a second spool position, movement of the spool between its positions progressively metering the fluid flow between unrestricted and substantially restricted conditions. The spool passage is arranged so that with the spool in one of its positions fluid under pressure entering the passage from one of the valve body ports moves the spool and the control piston in one direction to the other position thereby providing the metering operation. The cylinder section has a port for admitting fluid under pressure thereto so as to move the control piston and spool in the direction opposite the one direction.