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:
Mar. 15, 2011
Filed:
Nov. 14, 2007
Dwight B. Stephenson, Oconomowoc, WI (US);
Eric P. Hamkins, Waukesha, WI (US);
Joseph L. Pfaff, Wauwatosa, WI (US);
Keith A. Tabor, Richfield, WI (US);
Dwight B. Stephenson, Oconomowoc, WI (US);
Eric P. Hamkins, Waukesha, WI (US);
Joseph L. Pfaff, Wauwatosa, WI (US);
Keith A. Tabor, Richfield, WI (US);
INCOVA Technologies, Inc., Waukesha, WI (US);
Abstract
A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of both cylinders, and a shunt control valve is connected between the workports. A recovery control valve couples an accumulator to the first chamber of the second cylinder. Opening and closing the valves in different combinations routes fluid from one or both cylinders into the accumulator where the fluid is stored under pressure, and thereafter enables stored fluid to be used to power one or both cylinders. The shunt control valve is used to route fluid exhausting from one chamber of each cylinder to the other chambers of those cylinders. Thus the hydraulic system recovers and reuses energy in various manners.