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. 18, 1980
Filed:
Jun. 05, 1978
Harry M Meinert, Des Moines, IA (US);
John D Long, Ankeny, IA (US);
Deere & Company, Moline, IL (US);
Abstract
A hydraulic system is provided for an integrally-mounted agricultural implement which permits control of the tractor three-point hitch rockshaft cylinder, upper draft link hydraulic cylinder and lift assist hydraulic cylinder through a single valve control lever. One end of the double-acting lift assist cylinder is plumbed in parallel with the single-acting rockshaft cylinder and the other end of the lift assist cylinder is plumbed in parallel with the single-acting upper link cylinder. The fluid lines are coupled with a single control valve to permit the implement to be supported by the lift assist wheel and three-point hitch during transport, permit it to rock about the lower connection with the three-point hitch during transport and float vertically at the hitch connection during field operations while operating with the lift assist wheel elevated.