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:
Feb. 18, 2014
Filed:
Oct. 28, 2011
Travis S. Mergener, Horicon, WI (US);
Travis S. Mergener, Horicon, WI (US);
Deere & Company, Moline, IL (US);
Abstract
A synchronizing system for hydraulic four wheel steering includes double acting front and rear steering cylinders. The front and rear steering cylinders are moveable between retracted and extended positions in response to the position of a power steering valve. A synchronizing valve assembly is connected by hydraulic lines between the front and the rear steering cylinders, and includes a first directional relief valve that opens in response to hydraulic fluid pressure to synchronize both steering cylinders in a full left turn position, and a second directional relief valve that opens in response to hydraulic fluid pressure to synchronize both steering cylinders in a full right turn position.