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. 14, 2009
Filed:
Apr. 26, 2006
Marcus Bitter, Contwig, DE;
Marcus Bitter, Contwig, DE;
Deere & Company, Moline, IL (US);
Abstract
An improved hydraulic arrangement is provided for a spring support system. The arrangement comprises a hydraulic cylinder, a hydraulic reservoir, a hydraulic fluid feeder, a hydraulic accumulator, a first control valve between the hydraulic cylinder and the accumulator, a second control valve between the hydraulic cylinder and the hydraulic reservoir as well as an automatic shut-off valve and a controller with a lifting position, a lowering position and a neutral position for the hydraulic cylinder. In order to prevent different pressure loads between the accumulator and the hydraulic cylinder, it is suggested to equalize the pressure between the accumulator and the hydraulic cylinder, without impairing the spring support system or the automatic shut-off valve. Accordingly, the accumulator is suitably connected to a non-return valve and to a flow restrictor or orifice.