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. 18, 2000
Filed:
Oct. 30, 1998
Applicant:
Inventors:
Jon Fleagle, Waynesboro, PA (US);
David Young, Wilmington, NC (US);
Assignee:
Grove U.S. L.L.C., Shady Grove, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66C / ;
U.S. Cl.
CPC ...
212278 ; 212195 ;
Abstract
The automatic leveling and synchronization system for raising and lowering a counterweight includes at least a primary and secondary cylinder connected in series hydraulic communication. The primary cylinder includes a first rod connected to a first piston, and the first rod is attached to one end of a counterweight. The secondary cylinder includes a second rod connected to a second piston, and the second rod is attached to another end of the counterweight. A surface area of a bottom of the second piston is set equal to a surface area of a top of the first piston.