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:
Oct. 15, 2019
Filed:
Oct. 26, 2016
Deere & Company, Moline, IL (US);
John R. Mahrenholz, Peosta, IA (US);
Calin Raszga, Asbury, IA (US);
DEERE & COMPANY, Moline, IL (US);
Abstract
A hydraulic boom control system for a forestry machine includes a pump for pressurizing a hydraulic fluid on a high pressure side, a reservoir for storing hydraulic fluid on a low pressure side, and a first hydraulic cylinder including a cap end and a rod end. The first hydraulic cylinder is configured to actuate the hoist of the boom. A second hydraulic cylinder includes a cap end and a rod end and is configured to actuate the stick of the boom. A first control valve is operable to control the first hydraulic cylinder. A second control valve is operable to control the second hydraulic cylinder. A variable return metering valve is fluidly connected to at least one of the first or second control valves. The variable return metering valve is operable to modulate shared hydraulic fluid flow between the first hydraulic cylinder and the second hydraulic cylinder.